path: root/src/gui/kernel/qevent.cpp

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#include "qevent.h"
#include "qcursor.h"
#include "qapplication.h"
#include "private/qapplication_p.h"
#include "private/qkeysequence_p.h"
#include "qwidget.h"
#include "qgraphicsview.h"
#include "qdebug.h"
#include "qmime.h"
#include "qdnd_p.h"
#include "qevent_p.h"
#include "qgesture.h"
#include "qgesture_p.h"

QT_BEGIN_NAMESPACE

/*!
    \class QInputEvent
    \ingroup events

    \brief The QInputEvent class is the base class for events that
    describe user input.
*/

/*!
  \internal
*/
QInputEvent::QInputEvent(Type type, Qt::KeyboardModifiers modifiers)
    : QEvent(type), modState(modifiers)
{}

/*!
  \internal
*/
QInputEvent::~QInputEvent()
{
}

/*!
    \fn Qt::KeyboardModifiers QInputEvent::modifiers() const

    Returns the keyboard modifier flags that existed immediately
    before the event occurred.

    \sa QApplication::keyboardModifiers()
*/

/*! \fn void QInputEvent::setModifiers(Qt::KeyboardModifiers modifiers)

    \internal

    Sets the keyboard modifiers flags for this event.
*/

/*!
    \class QMouseEvent
    \ingroup events

    \brief The QMouseEvent class contains parameters that describe a mouse event.

    Mouse events occur when a mouse button is pressed or released
    inside a widget, or when the mouse cursor is moved.

    Mouse move events will occur only when a mouse button is pressed
    down, unless mouse tracking has been enabled with
    QWidget::setMouseTracking().

    Qt automatically grabs the mouse when a mouse button is pressed
    inside a widget; the widget will continue to receive mouse events
    until the last mouse button is released.

    A mouse event contains a special accept flag that indicates
    whether the receiver wants the event. You should call ignore() if
    the mouse event is not handled by your widget. A mouse event is
    propagated up the parent widget chain until a widget accepts it
    with accept(), or an event filter consumes it.

    \note If a mouse event is propagated to a \l{QWidget}{widget} for
    which Qt::WA_NoMousePropagation has been set, that mouse event
    will not be propagated further up the parent widget chain.

    The state of the keyboard modifier keys can be found by calling the
    \l{QInputEvent::modifiers()}{modifiers()} function, inherited from
    QInputEvent.

    The functions pos(), x(), and y() give the cursor position
    relative to the widget that receives the mouse event. If you
    move the widget as a result of the mouse event, use the global
    position returned by globalPos() to avoid a shaking motion.

    The QWidget::setEnabled() function can be used to enable or
    disable mouse and keyboard events for a widget.

    Reimplement the QWidget event handlers, QWidget::mousePressEvent(),
    QWidget::mouseReleaseEvent(), QWidget::mouseDoubleClickEvent(),
    and QWidget::mouseMoveEvent() to receive mouse events in your own
    widgets.

    \sa QWidget::setMouseTracking() QWidget::grabMouse()
    QCursor::pos()
*/

/*!
    Constructs a mouse event object.

    The \a type parameter must be one of QEvent::MouseButtonPress,
    QEvent::MouseButtonRelease, QEvent::MouseButtonDblClick,
    or QEvent::MouseMove.

    The \a position is the mouse cursor's position relative to the
    receiving widget.
    The \a button that caused the event is given as a value from
    the Qt::MouseButton enum. If the event \a type is
    \l MouseMove, the appropriate button for this event is Qt::NoButton.
    The mouse and keyboard states at the time of the event are specified by
    \a buttons and \a modifiers.

    The globalPos() is initialized to QCursor::pos(), which may not
    be appropriate. Use the other constructor to specify the global
    position explicitly.
*/

QMouseEvent::QMouseEvent(Type type, const QPoint &position, Qt::MouseButton button,
                         Qt::MouseButtons buttons, Qt::KeyboardModifiers modifiers)
    : QInputEvent(type, modifiers), p(position), b(button), mouseState(buttons)
{
    g = QCursor::pos();
}

/*!
    \internal
*/
QMouseEvent::~QMouseEvent()
{
}

#ifdef QT3_SUPPORT
/*!
    Use QMouseEvent(\a type, \a pos, \a button, \c buttons, \c
    modifiers) instead, where \c buttons is \a state &
    Qt::MouseButtonMask and \c modifiers is \a state &
    Qt::KeyButtonMask.
*/
QMouseEvent::QMouseEvent(Type type, const QPoint &pos, Qt::ButtonState button, int state)
    : QInputEvent(type), p(pos), b((Qt::MouseButton)button)
{
    g = QCursor::pos();
    mouseState = Qt::MouseButtons((state ^ b) & Qt::MouseButtonMask);
    modState = Qt::KeyboardModifiers(state & (int)Qt::KeyButtonMask);
}

/*!
    Use QMouseEvent(\a type, \a pos, \a globalPos, \a button,
    \c buttons, \c modifiers) instead, where
    \c buttons is \a state & Qt::MouseButtonMask and
    \c modifiers is \a state & Qt::KeyButtonMask.
*/
QMouseEvent::QMouseEvent(Type type, const QPoint &pos, const QPoint &globalPos,
                         Qt::ButtonState button, int state)
    : QInputEvent(type), p(pos), g(globalPos), b((Qt::MouseButton)button)
{
    mouseState = Qt::MouseButtons((state ^ b) & Qt::MouseButtonMask);
    modState = Qt::KeyboardModifiers(state & (int)Qt::KeyButtonMask);
}
#endif


/*!
    Constructs a mouse event object.

    The \a type parameter must be QEvent::MouseButtonPress,
    QEvent::MouseButtonRelease, QEvent::MouseButtonDblClick,
    or QEvent::MouseMove.

    The \a pos is the mouse cursor's position relative to the
    receiving widget. The cursor's position in global coordinates is
    specified by \a globalPos.  The \a button that caused the event is
    given as a value from the \l Qt::MouseButton enum. If the event \a
    type is \l MouseMove, the appropriate button for this event is
    Qt::NoButton. \a buttons is the state of all buttons at the
    time of the event, \a modifiers the state of all keyboard
    modifiers.

*/
QMouseEvent::QMouseEvent(Type type, const QPoint &pos, const QPoint &globalPos,
                         Qt::MouseButton button, Qt::MouseButtons buttons,
                         Qt::KeyboardModifiers modifiers)
    : QInputEvent(type, modifiers), p(pos), g(globalPos), b(button), mouseState(buttons)
{}

/*!
    \internal
*/
QMouseEvent *QMouseEvent::createExtendedMouseEvent(Type type, const QPointF &pos,
                                                   const QPoint &globalPos, Qt::MouseButton button,
                                                   Qt::MouseButtons buttons, Qt::KeyboardModifiers modifiers)
{
    return new QMouseEventEx(type, pos, globalPos, button, buttons, modifiers);
}

/*!
    \fn bool QMouseEvent::hasExtendedInfo() const
    \internal
*/

/*!
    \since 4.4

    Returns the position of the mouse cursor as a QPointF, relative to the
    widget that received the event.

    If you move the widget as a result of the mouse event, use the
    global position returned by globalPos() to avoid a shaking
    motion.

    \sa x() y() pos() globalPos()
*/
QPointF QMouseEvent::posF() const
{
    return hasExtendedInfo() ? reinterpret_cast<const QMouseEventEx *>(this)->posF : QPointF(pos());
}

/*!
    \internal
*/
QMouseEventEx::QMouseEventEx(Type type, const QPointF &pos, const QPoint &globalPos,
                             Qt::MouseButton button, Qt::MouseButtons buttons,
                             Qt::KeyboardModifiers modifiers)
    : QMouseEvent(type, pos.toPoint(), globalPos, button, buttons, modifiers), posF(pos)
{
    d = reinterpret_cast<QEventPrivate *>(this);
}

/*!
    \internal
*/
QMouseEventEx::~QMouseEventEx()
{
}

/*!
    \fn const QPoint &QMouseEvent::pos() const

    Returns the position of the mouse cursor, relative to the widget
    that received the event.

    If you move the widget as a result of the mouse event, use the
    global position returned by globalPos() to avoid a shaking
    motion.

    \sa x() y() globalPos()
*/

/*!
    \fn const QPoint &QMouseEvent::globalPos() const

    Returns the global position of the mouse cursor \e{at the time
    of the event}. This is important on asynchronous window systems
    like X11. Whenever you move your widgets around in response to
    mouse events, globalPos() may differ a lot from the current
    pointer position QCursor::pos(), and from
    QWidget::mapToGlobal(pos()).

    \sa globalX() globalY()
*/

/*!
    \fn int QMouseEvent::x() const

    Returns the x position of the mouse cursor, relative to the
    widget that received the event.

    \sa y() pos()
*/

/*!
    \fn int QMouseEvent::y() const

    Returns the y position of the mouse cursor, relative to the
    widget that received the event.

    \sa x() pos()
*/

/*!
    \fn int QMouseEvent::globalX() const

    Returns the global x position of the mouse cursor at the time of
    the event.

    \sa globalY() globalPos()
*/

/*!
    \fn int QMouseEvent::globalY() const

    Returns the global y position of the mouse cursor at the time of
    the event.

    \sa globalX() globalPos()
*/

/*!
    \fn Qt::MouseButton QMouseEvent::button() const

    Returns the button that caused the event.

    Note that the returned value is always Qt::NoButton for mouse
    move events.

    \sa buttons() Qt::MouseButton
*/

/*!
    \fn Qt::MouseButton QMouseEvent::buttons() const

    Returns the button state when the event was generated. The button
    state is a combination of Qt::LeftButton, Qt::RightButton,
    Qt::MidButton using the OR operator. For mouse move events,
    this is all buttons that are pressed down. For mouse press and
    double click events this includes the button that caused the
    event. For mouse release events this excludes the button that
    caused the event.

    \sa button() Qt::MouseButton
*/


/*!
    \fn Qt::ButtonState QMouseEvent::state() const

    Returns the button state immediately before the event was
    generated. The button state is a combination of mouse buttons
    (see Qt::ButtonState) and keyboard modifiers (Qt::MouseButtons).

    Use buttons() and/or modifiers() instead. Be aware that buttons()
    return the state immediately \e after the event was generated.
*/

/*!
    \fn Qt::ButtonState QMouseEvent::stateAfter() const

    Returns the button state immediately after the event was
    generated. The button state is a combination of mouse buttons
    (see Qt::ButtonState) and keyboard modifiers (Qt::MouseButtons).

    Use buttons() and/or modifiers() instead.
*/

/*!
    \class QHoverEvent
    \ingroup events

    \brief The QHoverEvent class contains parameters that describe a mouse event.

    Mouse events occur when a mouse cursor is moved into, out of, or within a
    widget, and if the widget has the Qt::WA_Hover attribute.

    The function pos() gives the current cursor position, while oldPos() gives
    the old mouse position.
*/

/*!
    \fn const QPoint &QHoverEvent::pos() const

    Returns the position of the mouse cursor, relative to the widget
    that received the event.

    On QEvent::HoverLeave events, this position will always be
    QPoint(-1, -1).

    \sa oldPos()
*/

/*!
    \fn const QPoint &QHoverEvent::oldPos() const

    Returns the previous position of the mouse cursor, relative to the widget
    that received the event. If there is no previous position, oldPos() will
    return the same position as pos().

    On QEvent::HoverEnter events, this position will always be
    QPoint(-1, -1).

    \sa pos()
*/

/*!
    Constructs a hover event object.

    The \a type parameter must be QEvent::HoverEnter,
    QEvent::HoverLeave, or QEvent::HoverMove.

    The \a pos is the current mouse cursor's position relative to the
    receiving widget, while \a oldPos is the previous mouse cursor's
    position relative to the receiving widget.
*/
QHoverEvent::QHoverEvent(Type type, const QPoint &pos, const QPoint &oldPos)
    : QEvent(type), p(pos), op(oldPos)
{
}

/*!
    \internal
*/
QHoverEvent::~QHoverEvent()
{
}


/*!
    \class QWheelEvent
    \brief The QWheelEvent class contains parameters that describe a wheel event.

    \ingroup events

    Wheel events are sent to the widget under the mouse cursor, but
    if that widget does not handle the event they are sent to the
    focus widget. The rotation distance is provided by delta().
    The functions pos() and globalPos() return the mouse cursor's
    location at the time of the event.

    A wheel event contains a special accept flag that indicates
    whether the receiver wants the event. You should call ignore() if
    you do not handle the wheel event; this ensures that it will be
    sent to the parent widget.

    The QWidget::setEnabled() function can be used to enable or
    disable mouse and keyboard events for a widget.

    The event handler QWidget::wheelEvent() receives wheel events.

    \sa QMouseEvent QWidget::grabMouse()
*/

/*!
    \fn Qt::MouseButtons QWheelEvent::buttons() const

    Returns the mouse state when the event occurred.
*/

/*!
    \fn Qt::Orientation QWheelEvent::orientation() const

    Returns the wheel's orientation.
*/

/*!
    Constructs a wheel event object.

    The position, \a pos, is the location of the mouse cursor within
    the widget. The globalPos() is initialized to QCursor::pos()
    which is usually, but not always, correct.
    Use the other constructor if you need to specify the global
    position explicitly.

    The \a buttons describe the state of the mouse buttons at the time
    of the event, \a delta contains the rotation distance,
    \a modifiers holds the keyboard modifier flags at the time of the
    event, and \a orient holds the wheel's orientation.

    \sa pos() delta() state()
*/
#ifndef QT_NO_WHEELEVENT
QWheelEvent::QWheelEvent(const QPoint &pos, int delta,
                         Qt::MouseButtons buttons, Qt::KeyboardModifiers modifiers,
                         Qt::Orientation orient)
    : QInputEvent(Wheel, modifiers), p(pos), d(delta), mouseState(buttons), o(orient)
{
    g = QCursor::pos();
}

/*!
  \internal
*/
QWheelEvent::~QWheelEvent()
{
}

#ifdef QT3_SUPPORT
/*!
    Use one of the other constructors instead.
*/
QWheelEvent::QWheelEvent(const QPoint &pos, int delta, int state, Qt::Orientation orient)
    : QInputEvent(Wheel), p(pos), d(delta), o(orient)
{
    g = QCursor::pos();
    mouseState = Qt::MouseButtons(state & Qt::MouseButtonMask);
    modState = Qt::KeyboardModifiers(state & (int)Qt::KeyButtonMask);
}
#endif

/*!
    Constructs a wheel event object.

    The \a pos provides the location of the mouse cursor
    within the widget. The position in global coordinates is specified
    by \a globalPos. \a delta contains the rotation distance, \a modifiers
    holds the keyboard modifier flags at the time of the event, and
    \a orient holds the wheel's orientation.

    \sa pos() globalPos() delta() state()
*/
QWheelEvent::QWheelEvent(const QPoint &pos, const QPoint& globalPos, int delta,
                         Qt::MouseButtons buttons, Qt::KeyboardModifiers modifiers,
                         Qt::Orientation orient)
    : QInputEvent(Wheel, modifiers), p(pos), g(globalPos), d(delta), mouseState(buttons), o(orient)
{}

#ifdef QT3_SUPPORT
/*!
    Use one of the other constructors instead.
*/
QWheelEvent::QWheelEvent(const QPoint &pos, const QPoint& globalPos, int delta, int state,
                         Qt::Orientation orient)
    : QInputEvent(Wheel), p(pos), g(globalPos), d(delta), o(orient)
{
    mouseState = Qt::MouseButtons(state & Qt::MouseButtonMask);
    modState = Qt::KeyboardModifiers(state & (int) Qt::KeyButtonMask);
}
#endif
#endif // QT_NO_WHEELEVENT

/*!
    \fn int QWheelEvent::delta() const

    Returns the distance that the wheel is rotated, in eighths of a
    degree. A positive value indicates that the wheel was rotated
    forwards away from the user; a negative value indicates that the
    wheel was rotated backwards toward the user.

    Most mouse types work in steps of 15 degrees, in which case the
    delta value is a multiple of 120; i.e., 120 units * 1/8 = 15 degrees.

    However, some mice have finer-resolution wheels and send delta values
    that are less than 120 units (less than 15 degrees). To support this
    possibility, you can either cumulatively add the delta values from events
    until the value of 120 is reached, then scroll the widget, or you can
    partially scroll the widget in response to each wheel event.

    Example:

    \snippet doc/src/snippets/code/src_gui_kernel_qevent.cpp 0
*/

/*!
    \fn const QPoint &QWheelEvent::pos() const

    Returns the position of the mouse cursor relative to the widget
    that received the event.

    If you move your widgets around in response to mouse events,
    use globalPos() instead of this function.

    \sa x() y() globalPos()
*/

/*!
    \fn int QWheelEvent::x() const

    Returns the x position of the mouse cursor, relative to the
    widget that received the event.

    \sa y() pos()
*/

/*!
    \fn int QWheelEvent::y() const

    Returns the y position of the mouse cursor, relative to the
    widget that received the event.

    \sa x() pos()
*/


/*!
    \fn const QPoint &QWheelEvent::globalPos() const

    Returns the global position of the mouse pointer \e{at the time
    of the event}. This is important on asynchronous window systems
    such as X11; whenever you move your widgets around in response to
    mouse events, globalPos() can differ a lot from the current
    cursor position returned by QCursor::pos().

    \sa globalX() globalY()
*/

/*!
    \fn int QWheelEvent::globalX() const

    Returns the global x position of the mouse cursor at the time of
    the event.

    \sa globalY() globalPos()
*/

/*!
    \fn int QWheelEvent::globalY() const

    Returns the global y position of the mouse cursor at the time of
    the event.

    \sa globalX() globalPos()
*/


/*! \obsolete
    \fn Qt::ButtonState QWheelEvent::state() const

    Returns the keyboard modifier flags at the time of the event.

    The returned value is a selection of the following values,
    combined using the OR operator: Qt::ShiftButton,
    Qt::ControlButton, and Qt::AltButton.
*/


/*!
    \class QKeyEvent
    \brief The QKeyEvent class describes a key event.

    \ingroup events

    Key events are sent to the widget with keyboard input focus
    when keys are pressed or released.

    A key event contains a special accept flag that indicates whether
    the receiver will handle the key event. You should call ignore()
    if the key press or release event is not handled by your widget.
    A key event is propagated up the parent widget chain until a
    widget accepts it with accept() or an event filter consumes it.
    Key events for multimedia keys are ignored by default. You should
    call accept() if your widget handles those events.

    The QWidget::setEnable() function can be used to enable or disable
    mouse and keyboard events for a widget.

    The event handlers QWidget::keyPressEvent(), QWidget::keyReleaseEvent(),
    QGraphicsItem::keyPressEvent() and QGraphicsItem::keyReleaseEvent()
    receive key events.

    \sa QFocusEvent, QWidget::grabKeyboard()
*/

/*!
    Constructs a key event object.

    The \a type parameter must be QEvent::KeyPress, QEvent::KeyRelease,
    or QEvent::ShortcutOverride.

    Int \a key is the code for the Qt::Key that the event loop should listen 
    for. If \a key is 0, the event is not a result of a known key; for 
    example, it may be the result of a compose sequence or keyboard macro.
    The \a modifiers holds the keyboard modifiers, and the given \a text 
    is the Unicode text that the key generated. If \a autorep is true, 
    isAutoRepeat() will be true. \a count is the number of keys involved 
    in the event.
*/
QKeyEvent::QKeyEvent(Type type, int key, Qt::KeyboardModifiers modifiers, const QString& text,
                     bool autorep, ushort count)
    : QInputEvent(type, modifiers), txt(text), k(key), c(count), autor(autorep)
{
}

/*!
  \internal
*/
QKeyEvent::~QKeyEvent()
{
}

/*!
    \internal
*/
QKeyEvent *QKeyEvent::createExtendedKeyEvent(Type type, int key, Qt::KeyboardModifiers modifiers,
                                             quint32 nativeScanCode, quint32 nativeVirtualKey,
                                             quint32 nativeModifiers,
                                             const QString& text, bool autorep, ushort count)
{
    return new QKeyEventEx(type, key, modifiers, text, autorep, count,
                           nativeScanCode, nativeVirtualKey, nativeModifiers);
}

/*!
    \fn bool QKeyEvent::hasExtendedInfo() const
    \internal
*/

/*!
  \since 4.2

  Returns the native scan code of the key event.  If the key event
  does not contain this data 0 is returned.

  Note: The native scan code may be 0, even if the key event contains
  extended information.

  Note: On Mac OS/X, this function is not useful, because there is no
  way to get the scan code from Carbon or Cocoa. The function always
  returns 1 (or 0 in the case explained above).
*/
quint32 QKeyEvent::nativeScanCode() const
{
    return (reinterpret_cast<const QKeyEvent*>(d) != this
            ? 0 : reinterpret_cast<const QKeyEventEx*>(this)->nScanCode);
}

/*!
    \since 4.2

    Returns the native virtual key, or key sym of the key event.
    If the key event does not contain this data 0 is returned.

    Note: The native virtual key may be 0, even if the key event contains extended information.
*/
quint32 QKeyEvent::nativeVirtualKey() const
{
    return (reinterpret_cast<const QKeyEvent*>(d) != this
            ? 0 : reinterpret_cast<const QKeyEventEx*>(this)->nVirtualKey);
}

/*!
    \since 4.2

    Returns the native modifiers of a key event.
    If the key event does not contain this data 0 is returned.

    Note: The native modifiers may be 0, even if the key event contains extended information.
*/
quint32 QKeyEvent::nativeModifiers() const
{
    return (reinterpret_cast<const QKeyEvent*>(d) != this
            ? 0 : reinterpret_cast<const QKeyEventEx*>(this)->nModifiers);
}

/*!
    \internal
    Creates an extended key event object, which in addition to the normal key event data, also
    contains the native scan code, virtual key and modifiers. This extra data is used by the
    shortcut system, to determine which shortcuts to trigger.
*/
QKeyEventEx::QKeyEventEx(Type type, int key, Qt::KeyboardModifiers modifiers,
                         const QString &text, bool autorep, ushort count,
                         quint32 nativeScanCode, quint32 nativeVirtualKey, quint32 nativeModifiers)
    : QKeyEvent(type, key, modifiers, text, autorep, count),
      nScanCode(nativeScanCode), nVirtualKey(nativeVirtualKey), nModifiers(nativeModifiers)
{
    d = reinterpret_cast<QEventPrivate*>(this);
}

/*!
    \internal
    Creates a copy of an other extended key event.
*/
QKeyEventEx::QKeyEventEx(const QKeyEventEx &other)
    : QKeyEvent(QEvent::Type(other.t), other.k, other.modState, other.txt, other.autor, other.c),
      nScanCode(other.nScanCode), nVirtualKey(other.nVirtualKey), nModifiers(other.nModifiers)
{
    d = reinterpret_cast<QEventPrivate*>(this);
}

/*!
    \internal
*/
QKeyEventEx::~QKeyEventEx()
{
}

/*!
    \fn int QKeyEvent::key() const

    Returns the code of the key that was pressed or released.

    See \l Qt::Key for the list of keyboard codes. These codes are
    independent of the underlying window system. Note that this
    function does not distinguish between capital and non-capital
    letters, use the text() function (returning the Unicode text the
    key generated) for this purpose.

    A value of either 0 or Qt::Key_unknown means that the event is not
    the result of a known key; for example, it may be the result of
    a compose sequence, a keyboard macro, or due to key event
    compression.

    \sa Qt::WA_KeyCompression
*/

/*!
    \fn QString QKeyEvent::text() const

    Returns the Unicode text that this key generated. The text
    returned can be an empty string in cases
    where modifier keys, such as Shift, Control, Alt, and Meta,
    are being pressed or released. In such cases key() will contain
    a valid value.

    \sa Qt::WA_KeyCompression
*/

/*!
    Returns the keyboard modifier flags that existed immediately
    after the event occurred.

    \warning This function cannot always be trusted. The user can
    confuse it by pressing both \key{Shift} keys simultaneously and
    releasing one of them, for example.

    \sa QApplication::keyboardModifiers()
*/
//###### We must check with XGetModifierMapping
Qt::KeyboardModifiers QKeyEvent::modifiers() const
{
    if (key() == Qt::Key_Shift)
        return Qt::KeyboardModifiers(QInputEvent::modifiers()^Qt::ShiftModifier);
    if (key() == Qt::Key_Control)
        return Qt::KeyboardModifiers(QInputEvent::modifiers()^Qt::ControlModifier);
    if (key() == Qt::Key_Alt)
        return Qt::KeyboardModifiers(QInputEvent::modifiers()^Qt::AltModifier);
    if (key() == Qt::Key_Meta)
        return Qt::KeyboardModifiers(QInputEvent::modifiers()^Qt::MetaModifier);
    return QInputEvent::modifiers();
}

#ifndef QT_NO_SHORTCUT
/*!
    \fn bool QKeyEvent::matches(QKeySequence::StandardKey key) const
    \since 4.2

    Returns true if the key event matches the given standard \a key;
    otherwise returns false.
*/
bool QKeyEvent::matches(QKeySequence::StandardKey matchKey) const
{
    uint searchkey = (modifiers() | key()) & ~(Qt::KeypadModifier); //The keypad modifier should not make a difference
    uint platform = QApplicationPrivate::currentPlatform();

#ifdef Q_WS_MAC
    if (qApp->testAttribute(Qt::AA_MacDontSwapCtrlAndMeta)) {
        uint oldSearchKey = searchkey;
        searchkey &= ~(Qt::ControlModifier | Qt::MetaModifier);
        if (oldSearchKey & Qt::ControlModifier)
            searchkey |= Qt::MetaModifier;
        if (oldSearchKey & Qt::MetaModifier)
            searchkey |= Qt::ControlModifier;
    }
#endif

    uint N = QKeySequencePrivate::numberOfKeyBindings;
    int first = 0;
    int last = N - 1;

    while (first <= last) {
        int mid = (first + last) / 2;
        QKeyBinding midVal = QKeySequencePrivate::keyBindings[mid];

        if (searchkey > midVal.shortcut){
            first = mid + 1;  // Search in top half
        }
        else if (searchkey < midVal.shortcut){
            last = mid - 1; // Search in bottom half
        }
        else {
            //found correct shortcut value, now we must check for platform match
            if ((midVal.platform & platform) && (midVal.standardKey == matchKey)) {
                return true;
            } else { //We may have several equal values for different platforms, so we must search in both directions

                //search forward
                for ( unsigned int i = mid + 1 ; i < N - 1 ; ++i) {
                    QKeyBinding current = QKeySequencePrivate::keyBindings[i];
                    if (current.shortcut != searchkey)
                        break;
                    else if (current.platform & platform && current.standardKey == matchKey)
                        return true;
                }

                //search back
                for ( int i = mid - 1 ; i >= 0 ; --i) {
                    QKeyBinding current = QKeySequencePrivate::keyBindings[i];
                    if (current.shortcut != searchkey)
                        break;
                    else if (current.platform & platform && current.standardKey == matchKey)
                        return true;
                }
                return false; //we could not find it among the matching keySequences
            }
        }
    }
    return false; //we could not find matching keySequences at all
}
#endif // QT_NO_SHORTCUT


/*!
    \fn bool QKeyEvent::isAutoRepeat() const

    Returns true if this event comes from an auto-repeating key;
    returns false if it comes from an initial key press.

    Note that if the event is a multiple-key compressed event that is
    partly due to auto-repeat, this function could return either true
    or false indeterminately.
*/

/*!
    \fn int QKeyEvent::count() const

    Returns the number of keys involved in this event. If text()
    is not empty, this is simply the length of the string.

    \sa Qt::WA_KeyCompression
*/

#ifdef QT3_SUPPORT
/*!
    \fn QKeyEvent::QKeyEvent(Type type, int key, int ascii,
                             int modifiers, const QString &text,
                             bool autorep, ushort count)

    Use one of the other constructors instead.
*/

/*!
    \fn int QKeyEvent::ascii() const

    Use text() instead.
*/

/*!
    \fn Qt::ButtonState QKeyEvent::state() const

    Use QInputEvent::modifiers() instead.
*/

/*!
    \fn Qt::ButtonState QKeyEvent::stateAfter() const

    Use modifiers() instead.
*/
#endif

/*!
    \class QFocusEvent
    \brief The QFocusEvent class contains event parameters for widget focus
    events.

    \ingroup events

    Focus events are sent to widgets when the keyboard input focus
    changes. Focus events occur due to mouse actions, key presses
    (such as \gui{Tab} or \gui{Backtab}), the window system, popup
    menus, keyboard shortcuts, or other application-specific reasons.
    The reason for a particular focus event is returned by reason()
    in the appropriate event handler.

    The event handlers QWidget::focusInEvent(),
    QWidget::focusOutEvent(), QGraphicsItem::focusInEvent and
    QGraphicsItem::focusOutEvent() receive focus events.

    \sa QWidget::setFocus(), QWidget::setFocusPolicy(), {Keyboard Focus}
*/

/*!
    Constructs a focus event object.

    The \a type parameter must be either QEvent::FocusIn or
    QEvent::FocusOut. The \a reason describes the cause of the change
    in focus.
*/
QFocusEvent::QFocusEvent(Type type, Qt::FocusReason reason)
    : QEvent(type), m_reason(reason)
{}

/*!
    \internal
*/
QFocusEvent::~QFocusEvent()
{
}

// ### Qt 5: remove
/*!
    \internal
 */
Qt::FocusReason QFocusEvent::reason()
{
    return m_reason;
}

/*!
    Returns the reason for this focus event.
 */
Qt::FocusReason QFocusEvent::reason() const
{
    return m_reason;
}

/*!
    \fn bool QFocusEvent::gotFocus() const

    Returns true if type() is QEvent::FocusIn; otherwise returns
    false.
*/

/*!
    \fn bool QFocusEvent::lostFocus() const

    Returns true if type() is QEvent::FocusOut; otherwise returns
    false.
*/

#ifdef QT3_SUPPORT
/*!
    \enum QFocusEvent::Reason
    \compat

    Use Qt::FocusReason instead.

    \value Mouse  Same as Qt::MouseFocusReason.
    \value Tab  Same as Qt::TabFocusReason.
    \value Backtab  Same as Qt::BacktabFocusReason.
    \value MenuBar  Same as Qt::MenuBarFocusReason.
    \value ActiveWindow  Same as Qt::ActiveWindowFocusReason
    \value Other  Same as Qt::OtherFocusReason
    \value Popup  Same as Qt::PopupFocusReason
    \value Shortcut  Same as Qt::ShortcutFocusReason
*/
#endif

/*!
    \class QPaintEvent
    \brief The QPaintEvent class contains event parameters for paint events.

    \ingroup events

    Paint events are sent to widgets that need to update themselves,
    for instance when part of a widget is exposed because a covering
    widget was moved.

    The event contains a region() that needs to be updated, and a
    rect() that is the bounding rectangle of that region. Both are
    provided because many widgets can't make much use of region(),
    and rect() can be much faster than region().boundingRect().

    \section1 Automatic Clipping

    Painting is clipped to region() during the processing of a paint
    event. This clipping is performed by Qt's paint system and is
    independent of any clipping that may be applied to a QPainter used to
    draw on the paint device.

    As a result, the value returned by QPainter::clipRegion() on
    a newly-constructed QPainter will not reflect the clip region that is
    used by the paint system.

    \sa QPainter, QWidget::update(), QWidget::repaint(),
        QWidget::paintEvent()
*/

/*!
    \fn bool QPaintEvent::erased() const
    \compat

    Returns true if the paint event region (or rectangle) has been
    erased with the widget's background; otherwise returns false.

    Qt 4 \e always erases regions that require painting. The exception
    to this rule is if the widget sets the Qt::WA_OpaquePaintEvent or
    Qt::WA_NoSystemBackground attributes. If either one of those
    attributes is set \e and the window system does not make use of
    subwidget alpha composition (currently X11 and Windows, but this
    may change), then the region is not erased.
*/

/*!
    \fn void QPaintEvent::setErased(bool b) { m_erased = b; }
    \internal
*/

/*!
    Constructs a paint event object with the region that needs to
    be updated. The region is specified by \a paintRegion.
*/
QPaintEvent::QPaintEvent(const QRegion& paintRegion)
    : QEvent(Paint), m_rect(paintRegion.boundingRect()), m_region(paintRegion), m_erased(false)
{}

/*!
    Constructs a paint event object with the rectangle that needs
    to be updated. The region is specified by \a paintRect.
*/
QPaintEvent::QPaintEvent(const QRect &paintRect)
    : QEvent(Paint), m_rect(paintRect),m_region(paintRect), m_erased(false)
{}


#ifdef QT3_SUPPORT
 /*!
    Constructs a paint event object with both a \a paintRegion and a
    \a paintRect, both of which represent the area of the widget that
    needs to be updated.

*/
QPaintEvent::QPaintEvent(const QRegion &paintRegion, const QRect &paintRect)
    : QEvent(Paint), m_rect(paintRect), m_region(paintRegion), m_erased(false)
{}
#endif

/*!
  \internal
*/
QPaintEvent::~QPaintEvent()
{
}

/*!
    \fn const QRect &QPaintEvent::rect() const

    Returns the rectangle that needs to be updated.

    \sa region() QPainter::setClipRect()
*/

/*!
    \fn const QRegion &QPaintEvent::region() const

    Returns the region that needs to be updated.

    \sa rect() QPainter::setClipRegion()
*/


QUpdateLaterEvent::QUpdateLaterEvent(const QRegion& paintRegion)
    : QEvent(UpdateLater), m_region(paintRegion)
{
}

QUpdateLaterEvent::~QUpdateLaterEvent()
{
}

/*!
    \class QMoveEvent
    \brief The QMoveEvent class contains event parameters for move events.

    \ingroup events

    Move events are sent to widgets that have been moved to a new
    position relative to their parent.

    The event handler QWidget::moveEvent() receives move events.

    \sa QWidget::move(), QWidget::setGeometry()
*/

/*!
    Constructs a move event with the new and old widget positions,
    \a pos and \a oldPos respectively.
*/
QMoveEvent::QMoveEvent(const QPoint &pos, const QPoint &oldPos)
    : QEvent(Move), p(pos), oldp(oldPos)
{}

/*!
  \internal
*/
QMoveEvent::~QMoveEvent()
{
}

/*!
    \fn const QPoint &QMoveEvent::pos() const

    Returns the new position of the widget. This excludes the window
    frame for top level widgets.
*/

/*!
    \fn const QPoint &QMoveEvent::oldPos() const

    Returns the old position of the widget.
*/


/*!
    \class QResizeEvent
    \brief The QResizeEvent class contains event parameters for resize events.

    \ingroup events

    Resize events are sent to widgets that have been resized.

    The event handler QWidget::resizeEvent() receives resize events.

    \sa QWidget::resize() QWidget::setGeometry()
*/

/*!
    Constructs a resize event with the new and old widget sizes, \a
    size and \a oldSize respectively.
*/
QResizeEvent::QResizeEvent(const QSize &size, const QSize &oldSize)
    : QEvent(Resize), s(size), olds(oldSize)
{}

/*!
  \internal
*/
QResizeEvent::~QResizeEvent()
{
}

/*!
    \fn const QSize &QResizeEvent::size() const

    Returns the new size of the widget. This is the same as
    QWidget::size().
*/

/*!
    \fn const QSize &QResizeEvent::oldSize() const

    Returns the old size of the widget.
*/


/*!
    \class QCloseEvent
    \brief The QCloseEvent class contains parameters that describe a close event.

    \ingroup events

    Close events are sent to widgets that the user wants to close,
    usually by choosing "Close" from the window menu, or by clicking
    the \gui{X} title bar button. They are also sent when you call
    QWidget::close() to close a widget programmatically.

    Close events contain a flag that indicates whether the receiver
    wants the widget to be closed or not. When a widget accepts the
    close event, it is hidden (and destroyed if it was created with
    the Qt::WA_DeleteOnClose flag). If it refuses to accept the close
    event nothing happens. (Under X11 it is possible that the window
    manager will forcibly close the window; but at the time of writing
    we are not aware of any window manager that does this.)

    The event handler QWidget::closeEvent() receives close events. The
    default implementation of this event handler accepts the close
    event. If you do not want your widget to be hidden, or want some
    special handing, you should reimplement the event handler and
    ignore() the event.

    The \l{mainwindows/application#close event handler}{closeEvent() in the
    Application example} shows a close event handler that
    asks whether to save a document before closing.

    If you want the widget to be deleted when it is closed, create it
    with the Qt::WA_DeleteOnClose flag. This is very useful for
    independent top-level windows in a multi-window application.

    \l{QObject}s emits the \l{QObject::destroyed()}{destroyed()}
    signal when they are deleted.

    If the last top-level window is closed, the
    QApplication::lastWindowClosed() signal is emitted.

    The isAccepted() function returns true if the event's receiver has
    agreed to close the widget; call accept() to agree to close the
    widget and call ignore() if the receiver of this event does not
    want the widget to be closed.

    \sa QWidget::close(), QWidget::hide(), QObject::destroyed(),
        QCoreApplication::exec(), QCoreApplication::quit(),
        QApplication::lastWindowClosed()
*/

/*!
    Constructs a close event object.

    \sa accept()
*/
QCloseEvent::QCloseEvent()
    : QEvent(Close)
{}

/*! \internal
*/
QCloseEvent::~QCloseEvent()
{
}

/*!
   \class QIconDragEvent
   \brief The QIconDragEvent class indicates that a main icon drag has begun.

   \ingroup events

   Icon drag events are sent to widgets when the main icon of a window
   has been dragged away. On Mac OS X, this happens when the proxy
   icon of a window is dragged off the title bar.

   It is normal to begin using drag and drop in response to this
   event.

   \sa {Drag and Drop}, QMimeData, QDrag
*/

/*!
    Constructs an icon drag event object with the accept flag set to
    false.

    \sa accept()
*/
QIconDragEvent::QIconDragEvent()
    : QEvent(IconDrag)
{ ignore(); }

/*! \internal */
QIconDragEvent::~QIconDragEvent()
{
}

/*!
    \class QContextMenuEvent
    \brief The QContextMenuEvent class contains parameters that describe a context menu event.

    \ingroup events

    Context menu events are sent to widgets when a user performs
    an action associated with opening a context menu.
    The actions required to open context menus vary between platforms;
    for example, on Windows, pressing the menu button or clicking the
    right mouse button will cause this event to be sent.

    When this event occurs it is customary to show a QMenu with a
    context menu, if this is relevant to the context.

    Context menu events contain a special accept flag that indicates
    whether the receiver accepted the event. If the event handler does
    not accept the event then, if possible, whatever triggered the event will be
    handled as a regular input event.
*/

#ifndef QT_NO_CONTEXTMENU
/*!
    Constructs a context menu event object with the accept parameter
    flag set to false.

    The \a reason parameter must be QContextMenuEvent::Mouse or
    QContextMenuEvent::Keyboard.

    The \a pos parameter specifies the mouse position relative to the
    receiving widget. \a globalPos is the mouse position in absolute
    coordinates.
*/
QContextMenuEvent::QContextMenuEvent(Reason reason, const QPoint &pos, const QPoint &globalPos)
    : QInputEvent(ContextMenu), p(pos), gp(globalPos), reas(reason)
{}

/*!
    Constructs a context menu event object with the accept parameter
    flag set to false.

    The \a reason parameter must be QContextMenuEvent::Mouse or
    QContextMenuEvent::Keyboard.

    The \a pos parameter specifies the mouse position relative to the
    receiving widget. \a globalPos is the mouse position in absolute
    coordinates. The \a modifiers holds the keyboard modifiers.
*/
QContextMenuEvent::QContextMenuEvent(Reason reason, const QPoint &pos, const QPoint &globalPos,
                                     Qt::KeyboardModifiers modifiers)
    : QInputEvent(ContextMenu, modifiers), p(pos), gp(globalPos), reas(reason)
{}

#ifdef QT3_SUPPORT
/*!
    Constructs a context menu event with the given \a reason for the
    position specified by \a pos in widget coordinates and \a globalPos
    in global screen coordinates. \a dummy is ignored.
*/
QContextMenuEvent::QContextMenuEvent(Reason reason, const QPoint &pos, const QPoint &globalPos,
                                     int /* dummy */)
    : QInputEvent(ContextMenu), p(pos), gp(globalPos), reas(reason)
{}
#endif

/*! \internal */
QContextMenuEvent::~QContextMenuEvent()
{
}
/*!
    Constructs a context menu event object with the accept parameter
    flag set to false.

    The \a reason parameter must be QContextMenuEvent::Mouse or
    QContextMenuEvent::Keyboard.

    The \a pos parameter specifies the mouse position relative to the
    receiving widget.

    The globalPos() is initialized to QCursor::pos(), which may not be
    appropriate. Use the other constructor to specify the global
    position explicitly.
*/
QContextMenuEvent::QContextMenuEvent(Reason reason, const QPoint &pos)
    : QInputEvent(ContextMenu), p(pos), reas(reason)
{
    gp = QCursor::pos();
}

#ifdef QT3_SUPPORT
/*!
    Constructs a context menu event with the given \a reason for the
    position specified by \a pos in widget coordinates. \a dummy is
    ignored.
*/
QContextMenuEvent::QContextMenuEvent(Reason reason, const QPoint &pos, int /* dummy */)
    : QInputEvent(ContextMenu), p(pos), reas(reason)
{
    gp = QCursor::pos();
}

Qt::ButtonState QContextMenuEvent::state() const
{
    return Qt::ButtonState(int(QApplication::keyboardModifiers())|QApplication::mouseButtons());
}
#endif

/*!
    \fn const QPoint &QContextMenuEvent::pos() const

    Returns the position of the mouse pointer relative to the widget
    that received the event.

    \sa x(), y(), globalPos()
*/

/*!
    \fn int QContextMenuEvent::x() const

    Returns the x position of the mouse pointer, relative to the
    widget that received the event.

    \sa y(), pos()
*/

/*!
    \fn int QContextMenuEvent::y() const

    Returns the y position of the mouse pointer, relative to the
    widget that received the event.

    \sa x(), pos()
*/

/*!
    \fn const QPoint &QContextMenuEvent::globalPos() const

    Returns the global position of the mouse pointer at the time of
    the event.

    \sa x(), y(), pos()
*/

/*!
    \fn int QContextMenuEvent::globalX() const

    Returns the global x position of the mouse pointer at the time of
    the event.

    \sa globalY(), globalPos()
*/

/*!
    \fn int QContextMenuEvent::globalY() const

    Returns the global y position of the mouse pointer at the time of
    the event.

    \sa globalX(), globalPos()
*/
#endif // QT_NO_CONTEXTMENU

/*!
    \fn Qt::ButtonState QContextMenuEvent::state() const

    Returns the button state (a combination of mouse buttons
    and keyboard modifiers) immediately before the event was
    generated.

    The returned value is a selection of the following values,
    combined with the OR operator:
    Qt::LeftButton, Qt::RightButton, Qt::MidButton,
    Qt::ShiftButton, Qt::ControlButton, and Qt::AltButton.
*/

/*!
    \enum QContextMenuEvent::Reason

    This enum describes the reason why the event was sent.

    \value Mouse The mouse caused the event to be sent. Normally this
    means the right mouse button was clicked, but this is platform
    dependent.

    \value Keyboard The keyboard caused this event to be sent. On
    Windows, this means the menu button was pressed.

    \value Other The event was sent by some other means (i.e. not by
    the mouse or keyboard).
*/


/*!
    \fn QContextMenuEvent::Reason QContextMenuEvent::reason() const

    Returns the reason for this context event.
*/


/*!
    \class QInputMethodEvent
    \brief The QInputMethodEvent class provides parameters for input method events.

    \ingroup events

    Input method events are sent to widgets when an input method is
    used to enter text into a widget. Input methods are widely used
    to enter text for languages with non-Latin alphabets.

    Note that when creating custom text editing widgets, the
    Qt::WA_InputMethodEnabled window attribute must be set explicitly
    (using the QWidget::setAttribute() function) in order to receive
    input method events.

    The events are of interest to authors of keyboard entry widgets
    who want to be able to correctly handle languages with complex
    character input. Text input in such languages is usually a three
    step process:

    \list 1
    \o \bold{Starting to Compose}

       When the user presses the first key on a keyboard, an input
       context is created. This input context will contain a string
       of the typed characters.

    \o \bold{Composing}

       With every new key pressed, the input method will try to create a
       matching string for the text typed so far called preedit
       string. While the input context is active, the user can only move
       the cursor inside the string belonging to this input context.

    \o \bold{Completing}

       At some point, the user will activate a user interface component
       (perhaps using a particular key) where they can choose from a
       number of strings matching the text they have typed so far. The
       user can either confirm their choice cancel the input; in either
       case the input context will be closed.
    \endlist

    QInputMethodEvent models these three stages, and transfers the
    information needed to correctly render the intermediate result. A
    QInputMethodEvent has two main parameters: preeditString() and
    commitString(). The preeditString() parameter gives the currently
    active preedit string. The commitString() parameter gives a text
    that should get added to (or replace parts of) the text of the
    editor widget. It usually is a result of the input operations and
    has to be inserted to the widgets text directly before the preedit
    string.

    If the commitString() should replace parts of the of the text in
    the editor, replacementLength() will contain the number of
    characters to be replaced. replacementStart() contains the position
    at which characters are to be replaced relative from the start of
    the preedit string.

    A number of attributes control the visual appearance of the
    preedit string (the visual appearance of text outside the preedit
    string is controlled by the widget only). The AttributeType enum
    describes the different attributes that can be set.

    A class implementing QWidget::inputMethodEvent() or 
    QGraphicsItem::inputMethodEvent() should at least understand and
    honor the \l TextFormat and \l Cursor attributes.

    Since input methods need to be able to query certain properties
    from the widget or graphics item, subclasses must also implement
    QWidget::inputMethodQuery() and QGraphicsItem::inputMethodQuery(),
    respectively.

    When receiving an input method event, the text widget has to performs the
    following steps:

    \list 1
    \o If the widget has selected text, the selected text should get
       removed.

    \o Remove the text starting at replacementStart() with length
       replacementLength() and replace it by the commitString(). If
       replacementLength() is 0, replacementStart() gives the insertion
       position for the commitString().

       When doing replacement the area of the preedit
       string is ignored, thus a replacement starting at -1 with a length
       of 2 will remove the last character before the preedit string and
       the first character afterwards, and insert the commit string
       directly before the preedit string.

       If the widget implements undo/redo, this operation gets added to
       the undo stack.

    \o If there is no current preedit string, insert the
       preeditString() at the current cursor position; otherwise replace
       the previous preeditString with the one received from this event.

       If the widget implements undo/redo, the preeditString() should not
       influence the undo/redo stack in any way.

       The widget should examine the list of attributes to apply to the
       preedit string. It has to understand at least the TextFormat and
       Cursor attributes and render them as specified.
    \endlist

    \sa QInputContext
*/

/*!
    \enum QInputMethodEvent::AttributeType

    \value TextFormat
    A QTextCharFormat for the part of the preedit string specified by
    start and length. value contains a QVariant of type QTextFormat
    specifying rendering of this part of the preedit string. There
    should be at most one format for every part of the preedit
    string. If several are specified for any character in the string the
    behaviour is undefined. A conforming implementation has to at least
    honor the backgroundColor, textColor and fontUnderline properties
    of the format.

    \value Cursor If set, a cursor should be shown inside the preedit
    string at position start. The length variable determines whether
    the cursor is visible or not. If the length is 0 the cursor is
    invisible. If value is a QVariant of type QColor this color will
    be used for rendering the cursor, otherwise the color of the
    surrounding text will be used. There should be at most one Cursor
    attribute per event. If several are specified the behaviour is
    undefined.

    \value Language
    The variant contains a QLocale object specifying the language of a
    certain part of the preedit string. There should be at most one
    language set for every part of the preedit string. If several are
    specified for any character in the string the behavior is undefined.

    \value Ruby
    The ruby text for a part of the preedit string. There should be at
    most one ruby text set for every part of the preedit string. If
    several are specified for any character in the string the behaviour
    is undefined.

    \value Selection
    If set, the edit cursor should be moved to the specified position
    in the editor text contents. In contrast with \c Cursor, this
    attribute does not work on the preedit text, but on the surrounding
    text. The cursor will be moved after the commit string has been
    committed, and the preedit string will be located at the new edit
    position.
    The start position specifies the new position and the length
    variable can be used to set a selection starting from that point.
    The value is unused.

    \sa Attribute
*/

/*!
    \class QInputMethodEvent::Attribute
    \brief The QInputMethodEvent::Attribute class stores an input method attribute.
*/

/*!
    \fn QInputMethodEvent::Attribute::Attribute(AttributeType type, int start, int length, QVariant value)

    Constructs an input method attribute. \a type specifies the type
    of attribute, \a start and \a length the position of the
    attribute, and \a value the value of the attribute.
*/

/*!
    Constructs an event of type QEvent::InputMethod. The
    attributes(), preeditString(), commitString(), replacementStart(),
    and replacementLength() are initialized to default values.

    \sa setCommitString()
*/
QInputMethodEvent::QInputMethodEvent()
    : QEvent(QEvent::InputMethod), replace_from(0), replace_length(0)
{
}

/*!
    Construcs an event of type QEvent::InputMethod. The
    preedit text is set to \a preeditText, the attributes to
    \a attributes.

    The commitString(), replacementStart(), and replacementLength()
    values can be set using setCommitString().

    \sa preeditString(), attributes()
*/
QInputMethodEvent::QInputMethodEvent(const QString &preeditText, const QList<Attribute> &attributes)
    : QEvent(QEvent::InputMethod), preedit(preeditText), attrs(attributes),
      replace_from(0), replace_length(0)
{
}

/*!
    Constructs a copy of \a other.
*/
QInputMethodEvent::QInputMethodEvent(const QInputMethodEvent &other)
    : QEvent(QEvent::InputMethod), preedit(other.preedit), attrs(other.attrs),
      commit(other.commit), replace_from(other.replace_from), replace_length(other.replace_length)
{
}

/*!
    Sets the commit string to \a commitString.

    The commit string is the text that should get added to (or
    replace parts of) the text of the editor widget. It usually is a
    result of the input operations and has to be inserted to the
    widgets text directly before the preedit string.

    If the commit string should replace parts of the of the text in
    the editor, \a replaceLength specifies the number of
    characters to be replaced. \a replaceFrom specifies the position
    at which characters are to be replaced relative from the start of
    the preedit string.

    \sa commitString(), replacementStart(), replacementLength()
*/
void QInputMethodEvent::setCommitString(const QString &commitString, int replaceFrom, int replaceLength)
{
    commit = commitString;
    replace_from = replaceFrom;
    replace_length = replaceLength;
}

/*!
    \fn const QList<Attribute> &QInputMethodEvent::attributes() const

    Returns the list of attributes passed to the QInputMethodEvent
    constructor. The attributes control the visual appearance of the
    preedit string (the visual appearance of text outside the preedit
    string is controlled by the widget only).

    \sa preeditString(), Attribute
*/

/*!
    \fn const QString &QInputMethodEvent::preeditString() const

    Returns the preedit text, i.e. the text before the user started
    editing it.

    \sa commitString(), attributes()
*/

/*!
    \fn const QString &QInputMethodEvent::commitString() const

    Returns the text that should get added to (or replace parts of)
    the text of the editor widget. It usually is a result of the
    input operations and has to be inserted to the widgets text
    directly before the preedit string.

    \sa setCommitString(), preeditString(), replacementStart(), replacementLength()
*/

/*!
    \fn int QInputMethodEvent::replacementStart() const

    Returns the position at which characters are to be replaced relative
    from the start of the preedit string.

    \sa replacementLength(), setCommitString()
*/

/*!
    \fn int QInputMethodEvent::replacementLength() const

    Returns the number of characters to be replaced in the preedit
    string.

    \sa replacementStart(), setCommitString()
*/

#ifndef QT_NO_TABLETEVENT

/*!
    \class QTabletEvent
    \brief The QTabletEvent class contains parameters that describe a Tablet event.

    \ingroup events

    Tablet Events are generated from a Wacom tablet. Most of the time you will
    want to deal with events from the tablet as if they were events from a
    mouse; for example, you would retrieve the cursor position with x(), y(),
    pos(), globalX(), globalY(), and globalPos(). In some situations you may
    wish to retrieve the extra information provided by the tablet device
    driver; for example, you might want to do subpixeling with higher
    resolution coordinates or you may want to adjust color brightness based on
    pressure.  QTabletEvent allows you to read the pressure(), the xTilt(), and
    yTilt(), as well as the type of device being used with device() (see
    \l{TabletDevice}). It can also give you the minimum and maximum values for
    each device's pressure and high resolution coordinates.

    A tablet event contains a special accept flag that indicates whether the
    receiver wants the event. You should call QTabletEvent::accept() if you
    handle the tablet event; otherwise it will be sent to the parent widget.
    The exception are TabletEnterProximity and TabletLeaveProximity events,
    these are only sent to QApplication and don't check whether or not they are
    accepted.

    The QWidget::setEnabled() function can be used to enable or
    disable mouse and keyboard events for a widget.

    The event handler QWidget::tabletEvent() receives all three types of
    tablet events. Qt will first send a tabletEvent then, if it is not
    accepted, it will send a mouse event. This allows applications that
    don't utilize tablets to use a tablet like a mouse, while also
    enabling those who want to use both tablets and mouses differently.

    \section1 Notes for X11 Users

    Qt uses the following hard-coded names to identify tablet
    devices from the xorg.conf file on X11 (apart from IRIX):
    'stylus', 'pen', and 'eraser'. If the devices have other names,
    they will not be picked up Qt.
*/

/*!
    \enum QTabletEvent::TabletDevice

    This enum defines what type of device is generating the event.

    \value NoDevice    No device, or an unknown device.
    \value Puck    A Puck (a device that is similar to a flat mouse with
    a transparent circle with cross-hairs).
    \value Stylus  A Stylus.
    \value Airbrush An airbrush
    \value FourDMouse A 4D Mouse.
    \value RotationStylus A special stylus that also knows about rotation
           (a 6D stylus). \since 4.1
    \omitvalue XFreeEraser
*/

/*!
    \enum QTabletEvent::PointerType

    This enum defines what type of point is generating the event.

    \value UnknownPointer    An unknown device.
    \value Pen    Tip end of a stylus-like device (the narrow end of the pen).
    \value Cursor  Any puck-like device.
    \value Eraser  Eraser end of a stylus-like device (the broad end of the pen).

    \sa pointerType()
*/

/*!
  Construct a tablet event of the given \a type.

  The \a pos parameter indicates where the event occurred in the
  widget; \a globalPos is the corresponding position in absolute
  coordinates. The \a hiResGlobalPos contains a high resolution
  measurement of the position.

  \a pressure contains the pressure exerted on the \a device.

  \a pointerType describes the type of pen that is being used.

  \a xTilt and \a yTilt contain the device's degree of tilt from the
  x and y axes respectively.

  \a keyState specifies which keyboard modifiers are pressed (e.g.,
  \key{Ctrl}).

  The \a uniqueID parameter contains the unique ID for the current device.

  The \a z parameter contains the coordinate of the device on the tablet, this
  is usually given by a wheel on 4D mouse. If the device does not support a
  Z-axis, pass zero here.

  The \a tangentialPressure paramater contins the tangential pressure of an air
  brush. If the device does not support tangential pressure, pass 0 here.

  \a rotation contains the device's rotation in degrees. 4D mice support
  rotation. If the device does not support rotation, pass 0 here.

  \sa pos() globalPos() device() pressure() xTilt() yTilt() uniqueId(), rotation(), tangentialPressure(), z()
*/

QTabletEvent::QTabletEvent(Type type, const QPoint &pos, const QPoint &globalPos,
                           const QPointF &hiResGlobalPos, int device, int pointerType,
                           qreal pressure, int xTilt, int yTilt, qreal tangentialPressure,
                           qreal rotation, int z, Qt::KeyboardModifiers keyState, qint64 uniqueID)
    : QInputEvent(type, keyState),
      mPos(pos),
      mGPos(globalPos),
      mHiResGlobalPos(hiResGlobalPos),
      mDev(device),
      mPointerType(pointerType),
      mXT(xTilt),
      mYT(yTilt),
      mZ(z),
      mPress(pressure),
      mTangential(tangentialPressure),
      mRot(rotation),
      mUnique(uniqueID),
      mExtra(0)
{
}

/*!
    \internal
*/
QTabletEvent::~QTabletEvent()
{
}

/*!
    \fn TabletDevices QTabletEvent::device() const

    Returns the type of device that generated the event.

    \sa TabletDevice
*/

/*!
    \fn PointerType QTabletEvent::pointerType() const

    Returns the type of point that generated the event.
*/

/*!
    \fn qreal QTabletEvent::tangentialPressure() const

    Returns the tangential pressure for the device.  This is typically given by a finger
    wheel on an airbrush tool.  The range is from -1.0 to 1.0. 0.0 indicates a
    neutral position.  Current airbrushes can only move in the positive
    direction from the neutrual position. If the device does not support
    tangential pressure, this value is always 0.0.

    \sa pressure()
*/

/*!
    \fn qreal QTabletEvent::rotation() const

    Returns the rotation of the current device in degress. This is usually
    given by a 4D Mouse. If the device doesn't support rotation this value is
    always 0.0.

*/

/*!
    \fn qreal QTabletEvent::pressure() const

    Returns the pressure for the device. 0.0 indicates that the stylus is not
    on the tablet, 1.0 indicates the maximum amount of pressure for the stylus.

    \sa tangentialPressure()
*/

/*!
    \fn int QTabletEvent::xTilt() const

    Returns the angle between the device (a pen, for example) and the
    perpendicular in the direction of the x axis.
    Positive values are towards the tablet's physical right. The angle
    is in the range -60 to +60 degrees.

    \img qtabletevent-tilt.png

    \sa yTilt()
*/

/*!
    \fn int QTabletEvent::yTilt() const

    Returns the angle between the device (a pen, for example) and the
    perpendicular in the direction of the y axis.
    Positive values are towards the bottom of the tablet. The angle is
    within the range -60 to +60 degrees.

    \sa xTilt()
*/

/*!
    \fn const QPoint &QTabletEvent::pos() const

    Returns the position of the device, relative to the widget that
    received the event.

    If you move widgets around in response to mouse events, use
    globalPos() instead of this function.

    \sa x() y() globalPos()
*/

/*!
    \fn int QTabletEvent::x() const

    Returns the x position of the device, relative to the widget that
    received the event.

    \sa y() pos()
*/

/*!
    \fn int QTabletEvent::y() const

    Returns the y position of the device, relative to the widget that
    received the event.

    \sa x() pos()
*/

/*!
    \fn int QTabletEvent::z() const

    Returns the z position of the device. Typically this is represented by a
    wheel on a 4D Mouse. If the device does not support a Z-axis, this value is
    always zero. This is \bold not the same as pressure.

    \sa pressure()
*/

/*!
    \fn const QPoint &QTabletEvent::globalPos() const

    Returns the global position of the device \e{at the time of the
    event}. This is important on asynchronous windows systems like X11;
    whenever you move your widgets around in response to mouse events,
    globalPos() can differ significantly from the current position
    QCursor::pos().

    \sa globalX() globalY() hiResGlobalPos()
*/

/*!
    \fn int QTabletEvent::globalX() const

    Returns the global x position of the mouse pointer at the time of
    the event.

    \sa globalY() globalPos() hiResGlobalX()
*/

/*!
    \fn int QTabletEvent::globalY() const

    Returns the global y position of the tablet device at the time of
    the event.

    \sa globalX() globalPos() hiResGlobalY()
*/

/*!
    \fn qint64 QTabletEvent::uniqueId() const

    Returns a unique ID for the current device, making it possible
    to differentiate between multiple devices being used at the same
    time on the tablet.

    Support of this feature is dependent on the tablet.

    Values for the same device may vary from OS to OS.

    Later versions of the Wacom driver for Linux will now report
    the ID information. If you have a tablet that supports unique ID
    and are not getting the information on Linux, consider upgrading
    your driver.

    As of Qt 4.2, the unique ID is the same regardless of the orientation
    of the pen. Earlier versions would report a different value when using
    the eraser-end versus the pen-end of the stylus on some OS's.

    \sa pointerType()
*/

/*!
    \fn const QPointF &QTabletEvent::hiResGlobalPos() const

    The high precision coordinates delivered from the tablet expressed.
    Sub pixeling information is in the fractional part of the QPointF.

    \sa globalPos() hiResGlobalX() hiResGlobalY()
*/

/*!
    \fn qreal &QTabletEvent::hiResGlobalX() const

    The high precision x position of the tablet device.
*/

/*!
    \fn qreal &QTabletEvent::hiResGlobalY() const

    The high precision y position of the tablet device.
*/

#endif // QT_NO_TABLETEVENT

#ifndef QT_NO_DRAGANDDROP
/*!
    Creates a QDragMoveEvent of the required \a type indicating
    that the mouse is at position \a pos given within a widget.

    The mouse and keyboard states are specified by \a buttons and
    \a modifiers, and the \a actions describe the types of drag
    and drop operation that are possible.
    The drag data is passed as MIME-encoded information in \a data.

    \warning Do not attempt to create a QDragMoveEvent yourself.
    These objects rely on Qt's internal state.
*/
QDragMoveEvent::QDragMoveEvent(const QPoint& pos, Qt::DropActions actions, const QMimeData *data,
                               Qt::MouseButtons buttons, Qt::KeyboardModifiers modifiers, Type type)
    : QDropEvent(pos, actions, data, buttons, modifiers, type)
    , rect(pos, QSize(1, 1))
{}

/*!
    Destroys the event.
*/
QDragMoveEvent::~QDragMoveEvent()
{
}

/*!
    \fn void QDragMoveEvent::accept(bool y)

    Calls setAccepted(\a y) instead.
*/

/*!
    \fn void QDragMoveEvent::accept(const QRect &rectangle)

    The same as accept(), but also notifies that future moves will
    also be acceptable if they remain within the \a rectangle
    given on the widget. This can improve performance, but may
    also be ignored by the underlying system.

    If the rectangle is empty, drag move events will be sent
    continuously. This is useful if the source is scrolling in a
    timer event.
*/

/*!
    \fn void QDragMoveEvent::accept()

    \overload

    Calls QDropEvent::accept().
*/

/*!
    \fn void QDragMoveEvent::ignore()

    \overload

    Calls QDropEvent::ignore().
*/

/*!
    \fn void QDragMoveEvent::ignore(const QRect &rectangle)

    The opposite of the accept(const QRect&) function.
    Moves within the \a rectangle are not acceptable, and will be
    ignored.
*/

/*!
    \fn QRect QDragMoveEvent::answerRect() const

    Returns the rectangle in the widget where the drop will occur if accepted.
    You can use this information to restrict drops to certain places on the
    widget.
*/


/*!
    \class QDropEvent
    \ingroup events
    \ingroup draganddrop

    \brief The QDropEvent class provides an event which is sent when a
    drag and drop action is completed.

    When a widget \l{QWidget::setAcceptDrops()}{accepts drop events}, it will
    receive this event if it has accepted the most recent QDragEnterEvent or
    QDragMoveEvent sent to it.

    The drop event contains a proposed action, available from proposedAction(), for
    the widget to either accept or ignore. If the action can be handled by the
    widget, you should call the acceptProposedAction() function. Since the
    proposed action can be a combination of \l Qt::DropAction values, it may be
    useful to either select one of these values as a default action or ask
    the user to select their preferred action.

    If the proposed drop action is not suitable, perhaps because your custom
    widget does not support that action, you can replace it with any of the
    \l{possibleActions()}{possible drop actions} by calling setDropAction()
    with your preferred action. If you set a value that is not present in the
    bitwise OR combination of values returned by possibleActions(), the default
    copy action will be used. Once a replacement drop action has been set, call
    accept() instead of acceptProposedAction() to complete the drop operation.

    The mimeData() function provides the data dropped on the widget in a QMimeData
    object. This contains information about the MIME type of the data in addition to
    the data itself.

    \sa QMimeData, QDrag, {Drag and Drop}
*/

/*!
    \fn const QMimeData *QDropEvent::mimeData() const

    Returns the data that was dropped on the widget and its associated MIME
    type information.
*/

/*!
    Constructs a drop event of a certain \a type corresponding to a
    drop at the point specified by \a pos in the destination widget's
    coordinate system.

    The \a actions indicate which types of drag and drop operation can
    be performed, and the drag data is stored as MIME-encoded data in \a data.

    The states of the mouse buttons and keyboard modifiers at the time of
    the drop are specified by \a buttons and \a modifiers.
*/ // ### pos is in which coordinate system?
QDropEvent::QDropEvent(const QPoint& pos, Qt::DropActions actions, const QMimeData *data,
                       Qt::MouseButtons buttons, Qt::KeyboardModifiers modifiers, Type type)
    : QEvent(type), p(pos), mouseState(buttons),
      modState(modifiers), act(actions),
      mdata(data)
{
    default_action = QDragManager::self()->defaultAction(act, modifiers);
    drop_action = default_action;
    ignore();
}

/*! \internal */
QDropEvent::~QDropEvent()
{
}

/*!
    \compat
    Returns a byte array containing the drag's data, in \a format.

    data() normally needs to get the data from the drag source, which
    is potentially very slow, so it's advisable to call this function
    only if you're sure that you will need the data in that
    particular \a format.

    The resulting data will have a size of 0 if the format was not
    available.

    \sa format() QByteArray::size()
*/

QByteArray QDropEvent::encodedData(const char *format) const
{
    return mdata->data(QLatin1String(format));
}

/*!
    \compat
    Returns a string describing one of the available data types for
    this drag. Common examples are "text/plain" and "image/gif".
    If \a n is less than zero or greater than the number of available
    data types, format() returns 0.

    This function is provided mainly for debugging. Most drop targets
    will use provides().

    \sa data() provides()
*/

const char* QDropEvent::format(int n) const
{
    if (fmts.isEmpty()) {
        QStringList formats = mdata->formats();
        for (int i = 0; i < formats.size(); ++i)
            fmts.append(formats.at(i).toLatin1());
    }
    if (n < 0 || n >= fmts.size())
        return 0;
    return fmts.at(n).constData();
}

/*!
    \compat
    Returns true if this event provides format \a mimeType; otherwise
    returns false.

    \sa data()
*/

bool QDropEvent::provides(const char *mimeType) const
{
    return mdata->formats().contains(QLatin1String(mimeType));
}

/*!
    If the source of the drag operation is a widget in this
    application, this function returns that source; otherwise it
    returns 0. The source of the operation is the first parameter to
    the QDrag object used instantiate the drag.

    This is useful if your widget needs special behavior when dragging
    to itself.

    \sa QDrag::QDrag()
*/
QWidget* QDropEvent::source() const
{
    QDragManager *manager = QDragManager::self();
    return manager ? manager->source() : 0;
}


void QDropEvent::setDropAction(Qt::DropAction action)
{
    if (!(action & act) && action != Qt::IgnoreAction)
        action = default_action;
    drop_action = action;
}

/*!
    \fn const QPoint& QDropEvent::pos() const

    Returns the position where the drop was made.
*/

/*!
    \fn Qt::MouseButtons QDropEvent::mouseButtons() const

    Returns the mouse buttons that are pressed..
*/

/*!
    \fn Qt::KeyboardModifiers QDropEvent::keyboardModifiers() const

    Returns the modifier keys that are pressed.
*/

/*!
    \fn void QDropEvent::accept()
    \internal
*/

/*!
    \fn void QDropEvent::accept(bool accept)

    Call setAccepted(\a accept) instead.
*/

/*!
    \fn void QDropEvent::acceptAction(bool accept = true)

    Call this to indicate that the action described by action() is
    accepted (i.e. if \a accept is true, which is the default), not merely
    the default copy action. If you call acceptAction(true), there is
    no need to also call accept(true).
*/

/*!
    \enum QDropEvent::Action
    \compat

    When a drag and drop action is completed, the target is expected
    to perform an action on the data provided by the source. This
    will be one of the following:

    \value Copy The default action. The source simply uses the data
                provided in the operation.
    \value Link The source should somehow create a link to the
                location specified by the data.
    \value Move The source should somehow move the object from the
                location specified by the data to a new location.
    \value Private  The target has special knowledge of the MIME type,
                which the source should respond to in a similar way to
                a Copy.
    \value UserAction  The source and target can co-operate using
                special actions. This feature is not currently
                supported.

    The Link and Move actions only makes sense if the data is a
    reference, for example, text/uri-list file lists (see QUriDrag).
*/

/*!
    \fn void QDropEvent::setDropAction(Qt::DropAction action)

    Sets the \a action to be performed on the data by the target.
    Use this to override the \l{proposedAction()}{proposed action}
    with one of the \l{possibleActions()}{possible actions}.

    If you set a drop action that is not one of the possible actions, the
    drag and drop operation will default to a copy operation.

    Once you have supplied a replacement drop action, call accept()
    instead of acceptProposedAction().

    \sa dropAction()
*/

/*!
    \fn Qt::DropAction QDropEvent::dropAction() const

    Returns the action to be performed on the data by the target. This may be
    different from the action supplied in proposedAction() if you have called
    setDropAction() to explicitly choose a drop action.

    \sa setDropAction()
*/

/*!
    \fn Qt::DropActions QDropEvent::possibleActions() const

    Returns an OR-combination of possible drop actions.

    \sa dropAction()
*/

/*!
    \fn Qt::DropAction QDropEvent::proposedAction() const

    Returns the proposed drop action.

    \sa dropAction()
*/

/*!
    \fn void QDropEvent::acceptProposedAction()

    Sets the drop action to be the proposed action.

    \sa setDropAction(), proposedAction(), {QEvent::accept()}{accept()}
*/

#ifdef QT3_SUPPORT
/*!
    Use dropAction() instead.

    The table below shows the correspondance between the return type
    of action() and the return type of dropAction().

    \table
    \header \i Old enum value   \i New enum value
    \row    \i QDropEvent::Copy \i Qt::CopyAction
    \row    \i QDropEvent::Move \i Qt::MoveAction
    \row    \i QDropEvent::Link \i Qt::LinkAction
    \row    \i other            \i Qt::CopyAction
    \endtable
*/

QT3_SUPPORT QDropEvent::Action QDropEvent::action() const
{
    switch(drop_action) {
    case Qt::CopyAction:
        return Copy;
    case Qt::MoveAction:
        return Move;
    case Qt::LinkAction:
        return Link;
    default:
        return Copy;
    }
}
#endif

/*!
    \fn void QDropEvent::setPoint(const QPoint &point)
    \compat

    Sets the drop to happen at the given \a point. You do not normally
    need to use this as it will be set internally before your widget
    receives the drop event.
*/ // ### here too - what coordinate system?


/*!
    \class QDragEnterEvent
    \brief The QDragEnterEvent class provides an event which is sent
    to a widget when a drag and drop action enters it.

    \ingroup events
    \ingroup draganddrop

    A widget must accept this event in order to receive the \l
    {QDragMoveEvent}{drag move events} that are sent while the drag
    and drop action is in progress. The drag enter event is always
    immediately followed by a drag move event.

    QDragEnterEvent inherits most of its functionality from
    QDragMoveEvent, which in turn inherits most of its functionality
    from QDropEvent.

    \sa QDragLeaveEvent, QDragMoveEvent, QDropEvent
*/

/*!
    Constructs a QDragEnterEvent that represents a drag entering a
    widget at the given \a point with mouse and keyboard states specified by
    \a buttons and \a modifiers.

    The drag data is passed as MIME-encoded information in \a data, and the
    specified \a actions describe the possible types of drag and drop
    operation that can be performed.

    \warning Do not create a QDragEnterEvent yourself since these
    objects rely on Qt's internal state.
*/
QDragEnterEvent::QDragEnterEvent(const QPoint& point, Qt::DropActions actions, const QMimeData *data,
                                 Qt::MouseButtons buttons, Qt::KeyboardModifiers modifiers)
    : QDragMoveEvent(point, actions, data, buttons, modifiers, DragEnter)
{}

/*! \internal
*/
QDragEnterEvent::~QDragEnterEvent()
{
}

/*!
    Constructs a drag response event containing the \a accepted value,
    indicating whether the drag and drop operation was accepted by the
    recipient.
*/
QDragResponseEvent::QDragResponseEvent(bool accepted)
    : QEvent(DragResponse), a(accepted)
{}

/*! \internal
*/
QDragResponseEvent::~QDragResponseEvent()
{
}

/*!
    \class QDragMoveEvent
    \brief The QDragMoveEvent class provides an event which is sent while a drag and drop action is in progress.

    \ingroup events
    \ingroup draganddrop

    A widget will receive drag move events repeatedly while the drag
    is within its boundaries, if it accepts
    \l{QWidget::setAcceptDrops()}{drop events} and \l
    {QWidget::dragEnterEvent()}{enter events}. The widget should
    examine the event to see what kind of data it
    \l{QDragMoveEvent::provides()}{provides}, and call the accept()
    function to accept the drop if appropriate.

    The rectangle supplied by the answerRect() function can be used to restrict
    drops to certain parts of the widget. For example, we can check whether the
    rectangle intersects with the geometry of a certain child widget and only
    call \l{QDropEvent::acceptProposedAction()}{acceptProposedAction()} if that
    is the case.

    Note that this class inherits most of its functionality from
    QDropEvent.

    \sa QDragEnterEvent, QDragLeaveEvent, QDropEvent
*/

/*!
    \class QDragLeaveEvent
    \brief The QDragLeaveEvent class provides an event that is sent to a widget when a drag and drop action leaves it.

    \ingroup events
    \ingroup draganddrop

    This event is always preceded by a QDragEnterEvent and a series
    of \l{QDragMoveEvent}s. It is not sent if a QDropEvent is sent
    instead.

    \sa QDragEnterEvent, QDragMoveEvent, QDropEvent
*/

/*!
    Constructs a QDragLeaveEvent.

    \warning Do not create a QDragLeaveEvent yourself since these
    objects rely on Qt's internal state.
*/
QDragLeaveEvent::QDragLeaveEvent()
    : QEvent(DragLeave)
{}

/*! \internal
*/
QDragLeaveEvent::~QDragLeaveEvent()
{
}
#endif // QT_NO_DRAGANDDROP

/*!
    \class QHelpEvent
    \brief The QHelpEvent class provides an event that is used to request helpful information
    about a particular point in a widget.

    \ingroup events
    \ingroup helpsystem

    This event can be intercepted in applications to provide tooltips
    or "What's This?" help for custom widgets. The type() can be
    either QEvent::ToolTip or QEvent::WhatsThis.

    \sa QToolTip, QWhatsThis, QStatusTipEvent, QWhatsThisClickedEvent
*/

/*!
    Constructs a help event with the given \a type corresponding to the
    widget-relative position specified by \a pos and the global position
    specified by \a globalPos.

    \a type must be either QEvent::ToolTip or QEvent::WhatsThis.

    \sa pos(), globalPos()
*/
QHelpEvent::QHelpEvent(Type type, const QPoint &pos, const QPoint &globalPos)
    : QEvent(type), p(pos), gp(globalPos)
{}

/*!
    \fn int QHelpEvent::x() const

    Same as pos().x().

    \sa y(), pos(), globalPos()
*/

/*!
    \fn int QHelpEvent::y() const

    Same as pos().y().

    \sa x(), pos(), globalPos()
*/

/*!
    \fn int QHelpEvent::globalX() const

    Same as globalPos().x().

    \sa x(), globalY(), globalPos()
*/

/*!
    \fn int QHelpEvent::globalY() const

    Same as globalPos().y().

    \sa y(), globalX(), globalPos()
*/

/*!
    \fn const QPoint &QHelpEvent::pos()  const

    Returns the mouse cursor position when the event was generated,
    relative to the widget to which the event is dispatched.

    \sa globalPos(), x(), y()
*/

/*!
    \fn const QPoint &QHelpEvent::globalPos() const

    Returns the mouse cursor position when the event was generated
    in global coordinates.

    \sa pos(), globalX(), globalY()
*/

/*! \internal
*/
QHelpEvent::~QHelpEvent()
{
}

#ifndef QT_NO_STATUSTIP

/*!
    \class QStatusTipEvent
    \brief The QStatusTipEvent class provides an event that is used to show messages in a status bar.

    \ingroup events
    \ingroup helpsystem

    Status tips can be set on a widget using the
    QWidget::setStatusTip() function.  They are shown in the status
    bar when the mouse cursor enters the widget. For example:

    \table 100%
    \row
    \o
    \snippet doc/src/snippets/qstatustipevent/main.cpp 1
    \dots
    \snippet doc/src/snippets/qstatustipevent/main.cpp 3
    \o
    \image qstatustipevent-widget.png Widget with status tip.
    \endtable

    Status tips can also be set on actions using the
    QAction::setStatusTip() function:

    \table 100%
    \row
    \o
    \snippet doc/src/snippets/qstatustipevent/main.cpp 0
    \snippet doc/src/snippets/qstatustipevent/main.cpp 2
    \dots
    \snippet doc/src/snippets/qstatustipevent/main.cpp 3
    \o
    \image qstatustipevent-action.png Action with status tip.
    \endtable

    Finally, status tips are supported for the item view classes
    through the Qt::StatusTipRole enum value.

    \sa QStatusBar, QHelpEvent, QWhatsThisClickedEvent
*/

/*!
    Constructs a status tip event with the text specified by \a tip.

    \sa tip()
*/
QStatusTipEvent::QStatusTipEvent(const QString &tip)
    : QEvent(StatusTip), s(tip)
{}

/*! \internal
*/
QStatusTipEvent::~QStatusTipEvent()
{
}

/*!
    \fn QString QStatusTipEvent::tip() const

    Returns the message to show in the status bar.

    \sa QStatusBar::showMessage()
*/

#endif // QT_NO_STATUSTIP

#ifndef QT_NO_WHATSTHIS

/*!
    \class QWhatsThisClickedEvent
    \brief The QWhatsThisClickedEvent class provides an event that
    can be used to handle hyperlinks in a "What's This?" text.

    \ingroup events
    \ingroup helpsystem

    \sa QWhatsThis, QHelpEvent, QStatusTipEvent
*/

/*!
    Constructs an event containing a URL specified by \a href when a link
    is clicked in a "What's This?" message.

    \sa href()
*/
QWhatsThisClickedEvent::QWhatsThisClickedEvent(const QString &href)
    : QEvent(WhatsThisClicked), s(href)
{}

/*! \internal
*/
QWhatsThisClickedEvent::~QWhatsThisClickedEvent()
{
}

/*!
    \fn QString QWhatsThisClickedEvent::href() const

    Returns the URL that was clicked by the user in the "What's
    This?" text.
*/

#endif // QT_NO_WHATSTHIS

#ifndef QT_NO_ACTION

/*!
    \class QActionEvent
    \brief The QActionEvent class provides an event that is generated
    when a QAction is added, removed, or changed.

    \ingroup events

    Actions can be added to widgets using QWidget::addAction(). This
    generates an \l ActionAdded event, which you can handle to provide
    custom behavior. For example, QToolBar reimplements
    QWidget::actionEvent() to create \l{QToolButton}s for the
    actions.

    \sa QAction, QWidget::addAction(), QWidget::removeAction(), QWidget::actions()
*/

/*!
    Constructs an action event. The \a type can be \l ActionChanged,
    \l ActionAdded, or \l ActionRemoved.

    \a action is the action that is changed, added, or removed. If \a
    type is ActionAdded, the action is to be inserted before the
    action \a before. If \a before is 0, the action is appended.
*/
QActionEvent::QActionEvent(int type, QAction *action, QAction *before)
    : QEvent(static_cast<QEvent::Type>(type)), act(action), bef(before)
{}

/*! \internal
*/
QActionEvent::~QActionEvent()
{
}

/*!
    \fn QAction *QActionEvent::action() const

    Returns the action that is changed, added, or removed.

    \sa before()
*/

/*!
    \fn QAction *QActionEvent::before() const

    If type() is \l ActionAdded, returns the action that should
    appear before action(). If this function returns 0, the action
    should be appended to already existing actions on the same
    widget.

    \sa action(), QWidget::actions()
*/

#endif // QT_NO_ACTION

/*!
    \class QHideEvent
    \brief The QHideEvent class provides an event which is sent after a widget is hidden.

    \ingroup events

    This event is sent just before QWidget::hide() returns, and also
    when a top-level window has been hidden (iconified) by the user.

    If spontaneous() is true, the event originated outside the
    application. In this case, the user hid the window using the
    window manager controls, either by iconifying the window or by
    switching to another virtual desktop where the window isn't
    visible. The window will become hidden but not withdrawn. If the
    window was iconified, QWidget::isMinimized() returns true.

    \sa QShowEvent
*/

/*!
    Constructs a QHideEvent.
*/
QHideEvent::QHideEvent()
    : QEvent(Hide)
{}

/*! \internal
*/
QHideEvent::~QHideEvent()
{
}

/*!
    \class QShowEvent
    \brief The QShowEvent class provides an event that is sent when a widget is shown.

    \ingroup events

    There are two kinds of show events: show events caused by the
    window system (spontaneous), and internal show events. Spontaneous (QEvent::spontaneous())
    show events are sent just after the window system shows the
    window; they are also sent when a top-level window is redisplayed
    after being iconified. Internal show events are delivered just
    before the widget becomes visible.

    \sa QHideEvent
*/

/*!
    Constructs a QShowEvent.
*/
QShowEvent::QShowEvent()
    : QEvent(Show)
{}

/*! \internal
*/
QShowEvent::~QShowEvent()
{
}

/*!
  \fn QByteArray QDropEvent::data(const char* f) const

  \obsolete

  The encoded data is in \a f.
  Use QDropEvent::encodedData().
*/

/*!
    \class QFileOpenEvent
    \brief The QFileOpenEvent class provides an event that will be
    sent when there is a request to open a file.

    \ingroup events

    File open events will be sent to the QApplication::instance()
    when the operating system requests that a file be opened. This is
    a high-level event that can be caused by different user actions
    depending on the user's desktop environment; for example, double
    clicking on an file icon in the Finder on Mac OS X.

    This event is only used to notify the application of a request.
    It may be safely ignored.

    \note This class is currently supported for Mac Os X only.
*/

/*!
    \internal

    Constructs a file open event for the given \a file.
*/
QFileOpenEvent::QFileOpenEvent(const QString &file)
    : QEvent(FileOpen), f(file)
{}

/*! \internal
*/
QFileOpenEvent::~QFileOpenEvent()
{
}

/*!
    \fn QString QFileOpenEvent::file() const

    Returns the file that is being opened.
*/

#ifndef QT_NO_TOOLBAR
/*!
    \internal
    \class QToolBarChangeEvent
    \brief The QToolBarChangeEvent class provides an event that is
    sent whenever a the toolbar button is clicked on Mac OS X.

    \ingroup events

    The QToolBarChangeEvent is sent when the toolbar button is clicked. On Mac
    OS X, this is the long oblong button on the right side of the window
    title bar. The default implementation is to toggle the appearance (hidden or
    shown) of the associated toolbars for the window.
*/

/*!
    \internal

    Construct a QToolBarChangeEvent given the current button state in \a state.
*/
QToolBarChangeEvent::QToolBarChangeEvent(bool t)
    : QEvent(ToolBarChange), tog(t)
{}

/*! \internal
*/
QToolBarChangeEvent::~QToolBarChangeEvent()
{
}

/*!
    \fn bool QToolBarChangeEvent::toggle() const
    \internal
*/

/*
    \fn Qt::ButtonState QToolBarChangeEvent::state() const

    Returns the keyboard modifier flags at the time of the event.

    The returned value is a selection of the following values,
    combined using the OR operator:
    Qt::ShiftButton, Qt::ControlButton, Qt::MetaButton, and Qt::AltButton.
*/

#endif // QT_NO_TOOLBAR

#ifndef QT_NO_SHORTCUT

/*!
    Constructs a shortcut event for the given \a key press,
    associated with the QShortcut ID \a id.

    \a ambiguous specifies whether there is more than one QShortcut
    for the same key sequence.
*/
QShortcutEvent::QShortcutEvent(const QKeySequence &key, int id, bool ambiguous)
    : QEvent(Shortcut), sequence(key), ambig(ambiguous), sid(id)
{
}

/*!
    Destroys the event object.
*/
QShortcutEvent::~QShortcutEvent()
{
}

#endif // QT_NO_SHORTCUT

#ifndef QT_NO_DEBUG_STREAM
QDebug operator<<(QDebug dbg, const QEvent *e) {
#ifndef Q_BROKEN_DEBUG_STREAM
    // More useful event output could be added here
    if (!e)
        return dbg << "QEvent(this = 0x0)";
    const char *n = 0;
    switch (e->type()) {
    case QEvent::Timer:
        n = "Timer";
        break;
    case QEvent::MouseButtonPress:
    case QEvent::MouseMove:
    case QEvent::MouseButtonRelease:
    case QEvent::MouseButtonDblClick:
    {
        const QMouseEvent *me = static_cast<const QMouseEvent*>(e);
        switch(me->type()) {
        case QEvent::MouseButtonPress:
            n = "MouseButtonPress";
            break;
        case QEvent::MouseMove:
            n = "MouseMove";
            break;
        case QEvent::MouseButtonRelease:
            n = "MouseButtonRelease";
            break;
        case QEvent::MouseButtonDblClick:
        default:
            n = "MouseButtonDblClick";
            break;
        }
        dbg.nospace() << "QMouseEvent("  << n
                      << ", " << me->button()
                      << ", " << hex << (int)me->buttons()
                      << ", " << hex << (int)me->modifiers()
                      << ')';
    }
    return dbg.space();

#ifndef QT_NO_TOOLTIP
    case QEvent::ToolTip:
        n = "ToolTip";
        break;
#endif
    case QEvent::WindowActivate:
        n = "WindowActivate";
        break;
    case QEvent::WindowDeactivate:
        n = "WindowDeactivate";
        break;
    case QEvent::ActivationChange:
        n = "ActivationChange";
        break;
#ifndef QT_NO_WHEELEVENT
    case QEvent::Wheel:
        dbg.nospace() << "QWheelEvent("  << static_cast<const QWheelEvent *>(e)->delta()
                      << ')';
        return dbg.space();
#endif
    case QEvent::KeyPress:
    case QEvent::KeyRelease:
    case QEvent::ShortcutOverride:
        {
            const QKeyEvent *ke = static_cast<const QKeyEvent*>(e);
            switch(ke->type()) {
            case QEvent::ShortcutOverride:
                n = "ShortcutOverride";
                break;
            case QEvent::KeyRelease:
                n = "KeyRelease";
                break;
            case QEvent::KeyPress:
            default:
                n = "KeyPress";
                break;
            }
            dbg.nospace() << "QKeyEvent("  << n
                          << ", " << hex << ke->key()
                          << ", " << hex << (int)ke->modifiers()
                          << ", \"" << ke->text()
                          << "\", " << ke->isAutoRepeat()
                          << ", " << ke->count()
                          << ')';
        }
        return dbg.space();
    case QEvent::FocusIn:
        n = "FocusIn";
        break;
    case QEvent::FocusOut:
        n = "FocusOut";
        break;
    case QEvent::Enter:
        n = "Enter";
        break;
    case QEvent::Leave:
        n = "Leave";
        break;
    case QEvent::PaletteChange:
        n = "PaletteChange";
        break;
    case QEvent::PolishRequest:
        n = "PolishRequest";
        break;
    case QEvent::Polish:
        n = "Polish";
        break;
    case QEvent::UpdateRequest:
        n = "UpdateRequest";
        break;
    case QEvent::Paint:
        n = "Paint";
        break;
    case QEvent::Move:
        n = "Move";
        break;
    case QEvent::Resize:
        n = "Resize";
        break;
    case QEvent::Create:
        n = "Create";
        break;
    case QEvent::Destroy:
        n = "Destroy";
        break;
    case QEvent::Close:
        n = "Close";
        break;
    case QEvent::Quit:
        n = "Quit";
        break;
    case QEvent::FileOpen:
        n = "FileOpen";
        break;
    case QEvent::Show:
        n = "Show";
        break;
    case QEvent::ShowToParent:
        n = "ShowToParent";
        break;
    case QEvent::Hide:
        n = "Hide";
        break;
    case QEvent::HideToParent:
        n = "HideToParent";
        break;
    case QEvent::None:
        n = "None";
        break;
    case QEvent::ParentChange:
        n = "ParentChange";
        break;
    case QEvent::ParentAboutToChange:
        n = "ParentAboutToChange";
        break;
    case QEvent::HoverEnter:
        n = "HoverEnter";
        break;
    case QEvent::HoverMove:
        n = "HoverMove";
        break;
    case QEvent::HoverLeave:
        n = "HoverLeave";
        break;
    case QEvent::ZOrderChange:
        n = "ZOrderChange";
        break;
    case QEvent::StyleChange:
        n = "StyleChange";
        break;
    case QEvent::DragEnter:
        n = "DragEnter";
        break;
    case QEvent::DragMove:
        n = "DragMove";
        break;
    case QEvent::DragLeave:
        n = "DragLeave";
        break;
    case QEvent::Drop:
        n = "Drop";
        break;
    case QEvent::GraphicsSceneMouseMove:
        n = "GraphicsSceneMouseMove";
        break;
    case QEvent::GraphicsSceneMousePress:
        n = "GraphicsSceneMousePress";
        break;
    case QEvent::GraphicsSceneMouseRelease:
        n = "GraphicsSceneMouseRelease";
        break;
    case QEvent::GraphicsSceneMouseDoubleClick:
        n = "GraphicsSceneMouseDoubleClick";
        break;
    case QEvent::GraphicsSceneContextMenu:
        n = "GraphicsSceneContextMenu";
        break;
    case QEvent::GraphicsSceneHoverEnter:
        n = "GraphicsSceneHoverEnter";
        break;
    case QEvent::GraphicsSceneHoverMove:
        n = "GraphicsSceneHoverMove";
        break;
    case QEvent::GraphicsSceneHoverLeave:
        n = "GraphicsSceneHoverLeave";
        break;
    case QEvent::GraphicsSceneHelp:
        n = "GraphicsSceneHelp";
        break;
    case QEvent::GraphicsSceneDragEnter:
        n = "GraphicsSceneDragEnter";
        break;
    case QEvent::GraphicsSceneDragMove:
        n = "GraphicsSceneDragMove";
        break;
    case QEvent::GraphicsSceneDragLeave:
        n = "GraphicsSceneDragLeave";
        break;
    case QEvent::GraphicsSceneDrop:
        n = "GraphicsSceneDrop";
        break;
    case QEvent::GraphicsSceneWheel:
        n = "GraphicsSceneWheel";
        break;
    case QEvent::GraphicsSceneResize:
        n = "GraphicsSceneResize";
        break;
    case QEvent::GraphicsSceneMove:
        n = "GraphicsSceneMove";
        break;
    case QEvent::CursorChange:
        n = "CursorChange";
        break;
    case QEvent::ToolTipChange:
        n = "ToolTipChange";
        break;
    case QEvent::StatusTip:
        n = "StatusTip";
        break;
    case QEvent::WhatsThis:
        n = "WhatsThis";
        break;
    case QEvent::FontChange:
        n = "FontChange";
        break;
    case QEvent::Style:
        n = "Style";
        break;
    case QEvent::KeyboardLayoutChange:
        n = "KeyboardLayoutChange";
        break;
    case QEvent::DynamicPropertyChange:
        n = "DynamicPropertyChange";
        break;
    case QEvent::GrabMouse:
        n = "GrabMouse";
        break;
    case QEvent::UngrabMouse:
        n = "UngrabMouse";
        break;
    case QEvent::GrabKeyboard:
        n = "GrabKeyboard";
        break;
    case QEvent::UngrabKeyboard:
        n = "UngrabKeyboard";
        break;
#ifdef QT3_SUPPORT
    case QEvent::ChildInsertedRequest:
      n = "ChildInsertedRequest";
      break;
    case QEvent::ChildInserted: n = "ChildInserted";
#endif
    case QEvent::ChildAdded: n = n ? n : "ChildAdded";
    case QEvent::ChildPolished: n = n ? n : "ChildPolished";
    case QEvent::ChildRemoved: n = n ? n : "ChildRemoved";
        dbg.nospace() << "QChildEvent(" << n << ", " << (static_cast<const QChildEvent*>(e))->child();
        return dbg.space();
    case QEvent::Gesture:
        n = "Gesture";
        break;
    default:
        dbg.nospace() << "QEvent(" << (const void *)e << ", type = " << e->type() << ')';
        return dbg.space();
    }

    dbg.nospace() << 'Q' << n << "Event(" << (const void *)e << ')';
    return dbg.space();
#else
    qWarning("This compiler doesn't support streaming QEvent to QDebug");
    return dbg;
    Q_UNUSED(e);
#endif
}
#endif

#ifndef QT_NO_CLIPBOARD
/*!
    \class QClipboardEvent
    \ingroup events
    \internal

    \brief The QClipboardEvent class provides the parameters used in a clipboard event.

    This class is for internal use only, and exists to aid the clipboard on various
    platforms to get all the information it needs. Use QEvent::Clipboard instead.

    \sa QClipboard
*/

QClipboardEvent::QClipboardEvent(QEventPrivate *data)
    : QEvent(QEvent::Clipboard)
{
    d = data;
}

QClipboardEvent::~QClipboardEvent()
{
}
#endif // QT_NO_CLIPBOARD

/*!
    \class QShortcutEvent
    \brief The QShortcutEvent class provides an event which is generated when
    the user presses a key combination.

    \ingroup events

    Normally you don't need to use this class directly; QShortcut
    provides a higher-level interface to handle shortcut keys.

    \sa QShortcut
*/

/*!
    \fn const QKeySequence &QShortcutEvent::key() const

    Returns the key sequence that triggered the event.
*/

// ### Qt 5: remove
/*!
    \fn const QKeySequence &QShortcutEvent::key()

    \internal
*/

/*!
    \fn int QShortcutEvent::shortcutId() const

    Returns the ID of the QShortcut object for which this event was
    generated.

    \sa QShortcut::id()
*/

// ### Qt 5: remove
/*!
    \fn int QShortcutEvent::shortcutId()
    \overload

    \internal
*/

/*!
    \fn bool QShortcutEvent::isAmbiguous() const

    Returns true if the key sequence that triggered the event is
    ambiguous.

    \sa QShortcut::activatedAmbiguously()
*/

// ### Qt 5: remove
/*!
    \fn bool QShortcutEvent::isAmbiguous()

    \internal
*/

/*!
    \class QWindowStateChangeEvent
    \ingroup events

    \brief The QWindowStateChangeEvent class provides the window state before a
    window state change.
*/

/*! \fn Qt::WindowStates QWindowStateChangeEvent::oldState() const

    Returns the state of the window before the change.
*/

/*! \internal
 */
QWindowStateChangeEvent::QWindowStateChangeEvent(Qt::WindowStates s)
    : QEvent(WindowStateChange), ostate(s)
{
}

/*! \internal
 */
QWindowStateChangeEvent::QWindowStateChangeEvent(Qt::WindowStates s, bool isOverride)
    : QEvent(WindowStateChange), ostate(s)
{
    if (isOverride)
        d = (QEventPrivate*)(this);
}

/*! \internal
 */
bool QWindowStateChangeEvent::isOverride() const
{
    return (d != 0);
}

/*! \internal
*/
QWindowStateChangeEvent::~QWindowStateChangeEvent()
{
}

#ifdef QT3_SUPPORT

/*!
    \class QMenubarUpdatedEvent
    \internal
    Event sent by QMenuBar to tell Q3Workspace to update itself.
*/

/*! \internal

*/
QMenubarUpdatedEvent::QMenubarUpdatedEvent(QMenuBar * const menuBar)
:QEvent(QEvent::MenubarUpdated), m_menuBar(menuBar) {}

/*!
    \fn QMenuBar *QMenubarUpdatedEvent::menuBar()
    \internal
*/

/*!
    \fn bool operator==(QKeyEvent *e, QKeySequence::StandardKey key)

    \relates QKeyEvent

    Returns true if \a key is currently bound to the key combination
    specified by \a e.

    Equivalent to \c {e->matches(key)}.
*/

/*!
    \fn bool operator==(QKeySequence::StandardKey key, QKeyEvent *e)

    \relates QKeyEvent

    Returns true if \a key is currently bound to the key combination
    specified by \a e.

    Equivalent to \c {e->matches(key)}.
*/

/*!
    \internal

    \class QKeyEventEx
    \ingroup events

    \brief The QKeyEventEx class provides more extended information about a keyevent.

    This class is for internal use only, and exists to aid the shortcut system on
    various platforms to get all the information it needs.
*/

#endif

/*! 
    \class QTouchEvent
    \brief The QTouchEvent class contains parameters that describe a touch event.
    \since 4.6
    \ingroup events
    \ingroup multitouch

    \section1 Enabling Touch Events

    Touch events occur when pressing, releasing, or moving one or more touch points on a touch
    device (such as a touch-screen or track-pad). To receive touch events, widgets have to have the
    Qt::WA_AcceptTouchEvents attribute set and graphics items need to have the
    \l{QGraphicsItem::setAcceptTouchEvents()}{acceptTouchEvents} attribute set to true.

    When using QAbstractScrollArea based widgets, you should enable the Qt::WA_AcceptTouchEvents
    attribute on the scroll area's \l{QAbstractScrollArea::viewport()}{viewport}.

    Similarly to QMouseEvent, Qt automatically grabs each touch point on the first press inside a
    widget, and the widget will receive all updates for the touch point until it is released.
    Note that it is possible for a widget to receive events for multiple touch points, and that
    multiple widgets may be receiving touch events at the same time.

    \section1 Event Handling

    All touch events are of type QEvent::TouchBegin, QEvent::TouchUpdate, or QEvent::TouchEnd.
    Reimplement QWidget::event() or QAbstractScrollArea::viewportEvent() for widgets and
    QGraphicsItem::sceneEvent() for items in a graphics view to receive touch events.

    The QEvent::TouchUpdate and QEvent::TouchEnd events are sent to the widget or item that
    accepted the QEvent::TouchBegin event. If the QEvent::TouchBegin event is not accepted and not
    filtered by an event filter, then no further touch events are sent until the next
    QEvent::TouchBegin.

    The touchPoints() function returns a list of all touch points contained in the event.
    Information about each touch point can be retrieved using the QTouchEvent::TouchPoint class.
    The Qt::TouchPointState enum describes the different states that a touch point may have.

    \section1 Event Delivery and Propagation

    By default, QWidget::event() translates the first non-primary touch point in a QTouchEvent into
    a QMouseEvent. This makes it possible to enable touch events on existing widgets that do not
    normally handle QTouchEvent. See below for information on some special considerations needed
    when doing this.

    QEvent::TouchBegin is the first touch event sent to a widget. The QEvent::TouchBegin event
    contains a special accept flag that indicates whether the receiver wants the event. By default,
    the event is accepted. You should call ignore() if the touch event is not handled by your
    widget. The QEvent::TouchBegin event is propagated up the parent widget chain until a widget
    accepts it with accept(), or an event filter consumes it. For QGraphicsItems, the
    QEvent::TouchBegin event is propagated to items under the mouse (similar to mouse event
    propagation for QGraphicsItems).

    \section1 Touch Point Grouping

    As mentioned above, it is possible that several widgets can be receiving QTouchEvents at the
    same time. However, Qt makes sure to never send duplicate QEvent::TouchBegin events to the same
    widget, which could theoretically happen during propagation if, for example, the user touched 2
    separate widgets in a QGroupBox and both widgets ignored the QEvent::TouchBegin event.

    To avoid this, Qt will group new touch points together using the following rules:

    \list

    \i When the first touch point is detected, the destination widget is determined firstly by the
    location on screen and secondly by the propagation rules.

    \i When additional touch points are detected, Qt first looks to see if there are any active
    touch points on any ancestor or descendent of the widget under the new touch point. If there
    are, the new touch point is grouped with the first, and the new touch point will be sent in a
    single QTouchEvent to the widget that handled the first touch point. (The widget under the new
    touch point will not receive an event).

    \endlist

    This makes it possible for sibling widgets to handle touch events independently while making
    sure that the sequence of QTouchEvents is always correct.

    \section1 Mouse Events and the Primary Touch Point

    QTouchEvent delivery is independent from that of QMouseEvent. On some windowing systems, mouse
    events are also sent for the \l{QTouchEvent::TouchPoint::isPrimary()}{primary touch point}.
    This means it is possible for your widget to receive both QTouchEvent and QMouseEvent for the
    same user interaction point. You can use the QTouchEvent::TouchPoint::isPrimary() function to
    identify the primary touch point.

    Note that on some systems, it is possible to receive touch events without a primary touch
    point. All this means is that there will be no mouse event generated for the touch points in
    the QTouchEvent.

    \section1 Caveats

    \list

    \i As mentioned above, enabling touch events means multiple widgets can be receiving touch
    events simultaneously. Combined with the default QWidget::event() handling for QTouchEvents,
    this gives you great flexibility in designing multi-touch user interfaces. Be aware of the
    implications. For example, it is possible that the user is moving a QSlider with one finger and
    pressing a QPushButton with another. The signals emitted by these widgets will be
    interleaved.

    \i Recursion into the event loop using one of the exec() methods (e.g., QDialog::exec() or
    QMenu::exec()) in a QTouchEvent event handler is not supported. Since there are multiple event
    recipients, recursion may cause problems, including but not limited to lost events
    and unexpected infinite recursion.

    \i QTouchEvents are not affected by a \l{QWidget::grabMouse()}{mouse grab} or an
    \l{QApplication::activePopupWidget()}{active pop-up widget}. The behavior of QTouchEvents is
    undefined when opening a pop-up or grabbing the mouse while there are multiple active touch
    points.

    \endlist

    \sa QTouchEvent::TouchPoint, Qt::TouchPointState, Qt::WA_AcceptTouchEvents,
    QGraphicsItem::acceptTouchEvents()
*/

/*! \enum Qt::TouchPointState
    \since 4.6

    This enum represents the state of a touch point at the time the
    QTouchEvent occurred.

    \value TouchPointPressed The touch point is now pressed.
    \value TouchPointMoved The touch point moved.
    \value TouchPointStationary The touch point did not move.
    \value TouchPointReleased The touch point was released.

    \omitvalue TouchPointStateMask
    \omitvalue TouchPointPrimary
*/

/*! \enum QTouchEvent::DeviceType

    This enum represents the type of device that generated a QTouchEvent.

    \value TouchScreen In this type of device, the touch surface and display are integrated. This
                       means the surface and display typically have the same size, such that there
                       is a direct relationship between the touch points' physical positions and the
                       coordinate reported by QTouchEvent::TouchPoint. As a result, Qt allows the
                       user to interact directly with multiple QWidgets and QGraphicsItems at the
                       same time.

    \value TouchPad In this type of device, the touch surface is separate from the display. There
                    is not a direct relationship between the physical touch location and the
                    on-screen coordinates. Instead, they are calculated relative to the current
                    mouse position, and the user must use the touch-pad to move this reference
                    point. Unlike touch-screens, Qt allows users to only interact with a single
                    QWidget or QGraphicsItem at a time.
*/

/*!
    Constructs a QTouchEvent with the given \a eventType, \a deviceType, and \a touchPoints.
    The \a touchPointStates and \a modifiers are the current touch point states and keyboard
    modifiers at the time of the event.
*/
QTouchEvent::QTouchEvent(QEvent::Type eventType,
                         QTouchEvent::DeviceType deviceType,
                         Qt::KeyboardModifiers modifiers,
                         Qt::TouchPointStates touchPointStates,
                         const QList<QTouchEvent::TouchPoint> &touchPoints)
    : QInputEvent(eventType, modifiers),
      _widget(0),
      _deviceType(deviceType),
      _touchPointStates(touchPointStates),
      _touchPoints(touchPoints)
{ }

/*!
    Destroys the QTouchEvent.
*/
QTouchEvent::~QTouchEvent()
{ }

/*! \fn QWidget *QTouchEvent::widget() const

    Returns the widget on which the event occurred.
*/


/*! \fn Qt::TouchPointStates QTouchEvent::touchPointStates() const

    Returns a bitwise OR of all the touch point states for this event.
*/

/*! \fn const QList<QTouchEvent::TouchPoint> &QTouchEvent::touchPoints() const

    Returns the list of touch points contained in the touch event.
*/

/*! \fn QTouchEvent::DeviceType QTouchEvent::deviceType() const

    Returns the touch device Type, which is of type \l {QTouchEvent::DeviceType} {DeviceType}.
*/

/*! \fn void QTouchEvent::setWidget(QWidget *widget)

    \internal

    Sets the widget for this event.
*/

/*! \fn void QTouchEvent::setTouchPointStates(Qt::TouchPointStates touchPointStates)

    \internal

    Sets a bitwise OR of all the touch point states for this event.
*/

/*! \fn void QTouchEvent::setTouchPoints(const QList<QTouchEvent::TouchPoint> &touchPoints)

    \internal

    Sets the list of touch points for this event.
*/

/*! \fn void QTouchEvent::setDeviceType(DeviceType deviceType)

    \internal

    Sets the device type to \a deviceType, which is of type \l {QTouchEvent::DeviceType}
    {DeviceType}.
*/

/*! \class QTouchEvent::TouchPoint
    \brief The TouchPoint class provides information about a touch point in a QTouchEvent.
    \since 4.6
*/

/*! \internal

    Constructs a QTouchEvent::TouchPoint for use in a QTouchEvent.
*/
QTouchEvent::TouchPoint::TouchPoint(int id)
    : d(new QTouchEventTouchPointPrivate(id))
{ }

/*! \internal

    Constructs a copy of \a other.
*/
QTouchEvent::TouchPoint::TouchPoint(const QTouchEvent::TouchPoint &other)
    : d(other.d)
{
    d->ref.ref();
}

/*! \internal

    Destroys the QTouchEvent::TouchPoint.
*/
QTouchEvent::TouchPoint::~TouchPoint()
{
    if (!d->ref.deref())
        delete d;
}

/*!
    Returns the id number of this touch point.

    Id numbers are globally sequential, starting at zero, meaning the
    first touch point in the application has id 0, the second has id 1,
    and so on.
*/
int QTouchEvent::TouchPoint::id() const
{
    return d->id;
}

/*!
    Returns the current state of this touch point.
*/
Qt::TouchPointState QTouchEvent::TouchPoint::state() const
{
    return Qt::TouchPointState(int(d->state) & Qt::TouchPointStateMask);
}

/*!
    Returns true if this touch point is the primary touch point. The primary touch point is the
    point for which the windowing system generates mouse events.
*/
bool QTouchEvent::TouchPoint::isPrimary() const
{
    return (d->state & Qt::TouchPointPrimary) != 0;
}

/*!
    Returns the position of this touch point, relative to the widget
    or QGraphicsItem that received the event.

    \sa startPos(), lastPos(), screenPos(), scenePos(), normalizedPos()
*/
QPointF QTouchEvent::TouchPoint::pos() const
{
    return d->rect.center();
}

/*!
    Returns the scene position of this touch point.

    The scene position is the position in QGraphicsScene coordinates
    if the QTouchEvent is handled by a QGraphicsItem::touchEvent()
    reimplementation, and identical to the screen position for
    widgets.

    \sa startScenePos(), lastScenePos(), pos()
*/
QPointF QTouchEvent::TouchPoint::scenePos() const
{
    return d->sceneRect.center();
}

/*!
    Returns the screen position of this touch point.

    \sa startScreenPos(), lastScreenPos(), pos()
*/
QPointF QTouchEvent::TouchPoint::screenPos() const
{
    return d->screenRect.center();
}

/*!
    Returns the normalized position of this touch point.

    The coordinates are normalized to the size of the touch device,
    i.e. (0,0) is the top-left corner and (1,1) is the bottom-right corner.

    \sa startNormalizedPos(), lastNormalizedPos(), pos()
*/
QPointF QTouchEvent::TouchPoint::normalizedPos() const
{
    return d->normalizedPos;
}

/*!
    Returns the starting position of this touch point, relative to the
    widget or QGraphicsItem that received the event.

    \sa pos(), lastPos()
*/
QPointF QTouchEvent::TouchPoint::startPos() const
{
    return d->startPos;
}

/*!
    Returns the starting scene position of this touch point.

    The scene position is the position in QGraphicsScene coordinates
    if the QTouchEvent is handled by a QGraphicsItem::touchEvent()
    reimplementation, and identical to the screen position for
    widgets.

    \sa scenePos(), lastScenePos()
*/
QPointF QTouchEvent::TouchPoint::startScenePos() const
{
    return d->startScenePos;
}

/*!
    Returns the starting screen position of this touch point.

    \sa screenPos(), lastScreenPos()
*/
QPointF QTouchEvent::TouchPoint::startScreenPos() const
{
    return d->startScreenPos;
}

/*!
    Returns the normalized starting position of this touch point.

    The coordinates are normalized to the size of the touch device,
    i.e. (0,0) is the top-left corner and (1,1) is the bottom-right corner.

    \sa normalizedPos(), lastNormalizedPos()
*/
QPointF QTouchEvent::TouchPoint::startNormalizedPos() const
{
    return d->startNormalizedPos;
}

/*!
    Returns the position of this touch point from the previous touch
    event, relative to the widget or QGraphicsItem that received the event.

    \sa pos(), startPos()
*/
QPointF QTouchEvent::TouchPoint::lastPos() const
{
    return d->lastPos;
}

/*!
    Returns the scene position of this touch point from the previous
    touch event.

    The scene position is the position in QGraphicsScene coordinates
    if the QTouchEvent is handled by a QGraphicsItem::touchEvent()
    reimplementation, and identical to the screen position for
    widgets.

    \sa scenePos(), startScenePos()
*/
QPointF QTouchEvent::TouchPoint::lastScenePos() const
{
    return d->lastScenePos;
}

/*!
    Returns the screen position of this touch point from the previous
    touch event.

    \sa screenPos(), startScreenPos()
*/
QPointF QTouchEvent::TouchPoint::lastScreenPos() const
{
    return d->lastScreenPos;
}

/*!
    Returns the normalized position of this touch point from the
    previous touch event.

    The coordinates are normalized to the size of the touch device,
    i.e. (0,0) is the top-left corner and (1,1) is the bottom-right corner.

    \sa normalizedPos(), startNormalizedPos()
*/
QPointF QTouchEvent::TouchPoint::lastNormalizedPos() const
{
    return d->lastNormalizedPos;
}

/*!
    Returns the rect for this touch point, relative to the widget
    or QGraphicsItem that received the event. The rect is centered
    around the point returned by pos().

    \note This function returns an empty rect if the device does not report touch point sizes.
*/
QRectF QTouchEvent::TouchPoint::rect() const
{
    return d->rect;
}

/*!
    Returns the rect for this touch point in scene coordinates.

    \note This function returns an empty rect if the device does not report touch point sizes.

    \sa scenePos(), rect()
*/
QRectF QTouchEvent::TouchPoint::sceneRect() const
{
    return d->sceneRect;
}

/*!
    Returns the rect for this touch point in screen coordinates.

    \note This function returns an empty rect if the device does not report touch point sizes.

    \sa screenPos(), rect()
*/
QRectF QTouchEvent::TouchPoint::screenRect() const
{
    return d->screenRect;
}

/*!
    Returns the pressure of this touch point. The return value is in
    the range 0.0 to 1.0.
*/
qreal QTouchEvent::TouchPoint::pressure() const
{
    return d->pressure;
}

/*! \internal */
void QTouchEvent::TouchPoint::setId(int id)
{
    if (d->ref != 1)
        d = d->detach();
    d->id = id;
}

/*! \internal */
void QTouchEvent::TouchPoint::setState(Qt::TouchPointStates state)
{
    if (d->ref != 1)
        d = d->detach();
    d->state = state;
}

/*! \internal */
void QTouchEvent::TouchPoint::setPos(const QPointF &pos)
{
    if (d->ref != 1)
        d = d->detach();
    d->rect.moveCenter(pos);
}

/*! \internal */
void QTouchEvent::TouchPoint::setScenePos(const QPointF &scenePos)
{
    if (d->ref != 1)
        d = d->detach();
    d->sceneRect.moveCenter(scenePos);
}

/*! \internal */
void QTouchEvent::TouchPoint::setScreenPos(const QPointF &screenPos)
{
    if (d->ref != 1)
        d = d->detach();
    d->screenRect.moveCenter(screenPos);
}

/*! \internal */
void QTouchEvent::TouchPoint::setNormalizedPos(const QPointF &normalizedPos)
{
    if (d->ref != 1)
        d = d->detach();
    d->normalizedPos = normalizedPos;
}

/*! \internal */
void QTouchEvent::TouchPoint::setStartPos(const QPointF &startPos)
{
    if (d->ref != 1)
        d = d->detach();
    d->startPos = startPos;
}

/*! \internal */
void QTouchEvent::TouchPoint::setStartScenePos(const QPointF &startScenePos)
{
    if (d->ref != 1)
        d = d->detach();
    d->startScenePos = startScenePos;
}

/*! \internal */
void QTouchEvent::TouchPoint::setStartScreenPos(const QPointF &startScreenPos)
{
    if (d->ref != 1)
        d = d->detach();
    d->startScreenPos = startScreenPos;
}

/*! \internal */
void QTouchEvent::TouchPoint::setStartNormalizedPos(const QPointF &startNormalizedPos)
{
    if (d->ref != 1)
        d = d->detach();
    d->startNormalizedPos = startNormalizedPos;
}

/*! \internal */
void QTouchEvent::TouchPoint::setLastPos(const QPointF &lastPos)
{
    if (d->ref != 1)
        d = d->detach();
    d->lastPos = lastPos;
}

/*! \internal */
void QTouchEvent::TouchPoint::setLastScenePos(const QPointF &lastScenePos)
{
    if (d->ref != 1)
        d = d->detach();
    d->lastScenePos = lastScenePos;
}

/*! \internal */
void QTouchEvent::TouchPoint::setLastScreenPos(const QPointF &lastScreenPos)
{
    if (d->ref != 1)
        d = d->detach();
    d->lastScreenPos = lastScreenPos;
}

/*! \internal */
void QTouchEvent::TouchPoint::setLastNormalizedPos(const QPointF &lastNormalizedPos)
{
    if (d->ref != 1)
        d = d->detach();
    d->lastNormalizedPos = lastNormalizedPos;
}

/*! \internal */
void QTouchEvent::TouchPoint::setRect(const QRectF &rect)
{
    if (d->ref != 1)
        d = d->detach();
    d->rect = rect;
}

/*! \internal */
void QTouchEvent::TouchPoint::setSceneRect(const QRectF &sceneRect)
{
    if (d->ref != 1)
        d = d->detach();
    d->sceneRect = sceneRect;
}

/*! \internal */
void QTouchEvent::TouchPoint::setScreenRect(const QRectF &screenRect)
{
    if (d->ref != 1)
        d = d->detach();
    d->screenRect = screenRect;
}

/*! \internal */
void QTouchEvent::TouchPoint::setPressure(qreal pressure)
{
    if (d->ref != 1)
        d = d->detach();
    d->pressure = pressure;
}

/*! \internal */
QTouchEvent::TouchPoint &QTouchEvent::TouchPoint::operator=(const QTouchEvent::TouchPoint &other)
{
    other.d->ref.ref();
    if (!d->ref.deref())
        delete d;
    d = other.d;
    return *this;
}

/*!
    \class QGestureEvent
    \since 4.6
    \ingroup events
    \ingroup gestures

    \brief The QGestureEvent class provides the description of triggered gestures.

    The QGestureEvent class contains a list of gestures, which can be obtained using the
    allGestures() function.

    The gestures are either active or canceled. A list of those that are currently being
    executed can be obtained using the activeGestures() function. A list of those which
    were previously active and have been canceled can be accessed using the
    canceledGestures() function. A gesture might be canceled if the current window loses
    focus, for example, or because of a timeout, or for other reasons.

    If the event handler does not accept the event by calling the generic
    QEvent::accept() function, all individual QGesture object that were not accepted
    will be propagated up the parent widget chain until a widget accepts them
    individually, by calling QGestureEvent::accept() for each of them, or an event
    filter consumes the event.

    \sa QGesture, QGestureRecognizer,
        QWidget::grabGesture(), QGraphicsObject::grabGesture()
*/

/*!
    Creates new QGestureEvent containing a list of \a gestures.
*/
QGestureEvent::QGestureEvent(const QList<QGesture *> &gestures)
    : QEvent(QEvent::Gesture)
{
    d = reinterpret_cast<QEventPrivate *>(new QGestureEventPrivate(gestures));
}

/*!
    Destroys QGestureEvent.
*/
QGestureEvent::~QGestureEvent()
{
    delete reinterpret_cast<QGestureEventPrivate *>(d);
}

/*!
    Returns all gestures that are delivered in the event.
*/
QList<QGesture *> QGestureEvent::allGestures() const
{
    return d_func()->gestures;
}

/*!
    Returns a gesture object by \a type.
*/
QGesture *QGestureEvent::gesture(Qt::GestureType type) const
{
    const QGestureEventPrivate *d = d_func();
    for(int i = 0; i < d->gestures.size(); ++i)
        if (d->gestures.at(i)->gestureType() == type)
            return d->gestures.at(i);
    return 0;
}

/*!
    Returns a list of active (not canceled) gestures.
*/
QList<QGesture *> QGestureEvent::activeGestures() const
{
    QList<QGesture *> gestures;
    foreach (QGesture *gesture, d_func()->gestures) {
        if (gesture->state() != Qt::GestureCanceled)
            gestures.append(gesture);
    }
    return gestures;
}

/*!
    Returns a list of canceled gestures.
*/
QList<QGesture *> QGestureEvent::canceledGestures() const
{
    QList<QGesture *> gestures;
    foreach (QGesture *gesture, d_func()->gestures) {
        if (gesture->state() == Qt::GestureCanceled)
            gestures.append(gesture);
    }
    return gestures;
}

/*!
    Sets the accept flag of the given \a gesture object to the specified \a value.

    Setting the accept flag indicates that the event receiver wants the \a gesture.
    Unwanted gestures may be propagated to the parent widget.

    By default, gestures in events of type QEvent::Gesture are accepted, and
    gestures in QEvent::GestureOverride events are ignored.

    For convenience, the accept flag can also be set with
    \l{QGestureEvent::accept()}{accept(gesture)}, and cleared with
    \l{QGestureEvent::ignore()}{ignore(gesture)}.
*/
void QGestureEvent::setAccepted(QGesture *gesture, bool value)
{
    if (gesture)
        setAccepted(gesture->gestureType(), value);
}

/*!
    Sets the accept flag of the given \a gesture object, the equivalent of calling
    \l{QGestureEvent::setAccepted()}{setAccepted(gesture, true)}.

    Setting the accept flag indicates that the event receiver wants the
    gesture. Unwanted gestures may be propagated to the parent widget.

    \sa QGestureEvent::ignore()
*/
void QGestureEvent::accept(QGesture *gesture)
{
    if (gesture)
        setAccepted(gesture->gestureType(), true);
}

/*!
    Clears the accept flag parameter of the given \a gesture object, the equivalent
    of calling \l{QGestureEvent::setAccepted()}{setAccepted(gesture, false)}.

    Clearing the accept flag indicates that the event receiver does not
    want the gesture. Unwanted gestures may be propgated to the parent widget.

    \sa QGestureEvent::accept()
*/
void QGestureEvent::ignore(QGesture *gesture)
{
    if (gesture)
        setAccepted(gesture->gestureType(), false);
}

/*!
    Returns true if the \a gesture is accepted; otherwise returns false.
*/
bool QGestureEvent::isAccepted(QGesture *gesture) const
{
    return gesture ? isAccepted(gesture->gestureType()) : false;
}

/*!
    Sets the accept flag of the given \a gestureType object to the specified
    \a value.

    Setting the accept flag indicates that the event receiver wants the \a gesture.
    Unwanted gestures may be propagated to the parent widget.

    By default, gestures in events of type QEvent::Gesture are accepted, and
    gestures in QEvent::GestureOverride events are ignored.

    For convenience, the accept flag can also be set with
    \l{QGestureEvent::accept()}{accept(gestureType)}, and cleared with
    \l{QGestureEvent::ignore()}{ignore(gestureType)}.
*/
void QGestureEvent::setAccepted(Qt::GestureType gestureType, bool value)
{
    setAccepted(false);
    d_func()->accepted[gestureType] = value;
}

/*!
    Sets the accept flag of the given \a gestureType, the equivalent of calling
    \l{QGestureEvent::setAccepted()}{setAccepted(gestureType, true)}.

    Setting the accept flag indicates that the event receiver wants the
    gesture. Unwanted gestures may be propagated to the parent widget.

    \sa QGestureEvent::ignore()
*/
void QGestureEvent::accept(Qt::GestureType gestureType)
{
    setAccepted(gestureType, true);
}

/*!
    Clears the accept flag parameter of the given \a gestureType, the equivalent
    of calling \l{QGestureEvent::setAccepted()}{setAccepted(gesture, false)}.

    Clearing the accept flag indicates that the event receiver does not
    want the gesture. Unwanted gestures may be propgated to the parent widget.

    \sa QGestureEvent::accept()
*/
void QGestureEvent::ignore(Qt::GestureType gestureType)
{
    setAccepted(gestureType, false);
}

/*!
    Returns true if the gesture of type \a gestureType is accepted; otherwise
    returns false.
*/
bool QGestureEvent::isAccepted(Qt::GestureType gestureType) const
{
    return d_func()->accepted.value(gestureType, true);
}

/*!
    \internal

    Sets the widget for this event.
*/
void QGestureEvent::setWidget(QWidget *widget)
{
    d_func()->widget = widget;
}

/*!
    Returns the widget on which the event occurred.
*/
QWidget *QGestureEvent::widget() const
{
    return d_func()->widget;
}

#ifndef QT_NO_GRAPHICSVIEW
/*!
    Returns the scene-local coordinates if the \a gesturePoint is inside a graphics view.

    \sa QPointF::isNull().
*/
QPointF QGestureEvent::mapToScene(const QPointF &gesturePoint) const
{
    QWidget *w = widget();
    if (w) // we get the viewport as widget, not the graphics view
        w = w->parentWidget();
    QGraphicsView *view = qobject_cast<QGraphicsView*>(w);
    if (view) {
        return view->mapToScene(view->mapFromGlobal(gesturePoint.toPoint()));
    }
    return QPointF();
}
#endif //QT_NO_GRAPHICSVIEW

/*!
    \internal
*/
QGestureEventPrivate *QGestureEvent::d_func()
{
    return reinterpret_cast<QGestureEventPrivate *>(d);
}

/*!
    \internal
*/
const QGestureEventPrivate *QGestureEvent::d_func() const
{
    return reinterpret_cast<const QGestureEventPrivate *>(d);
}

#ifdef Q_NO_USING_KEYWORD
/*!
    \fn void QGestureEvent::setAccepted(bool accepted)

    Sets or clears the event's internal flag that determines whether it should
    be delivered to other objects.

    Calling this function with a value of true for \a accepted indicates that the
    caller has accepted the event and that it should not be propagated further.
    Calling this function with a value of false indicates that the caller has
    ignored the event and that it should be delivered to other objects.

    For convenience, the accept flag can also be set with accept(), and cleared
    with ignore().

    \sa QEvent::accepted
*/
/*!
    \fn bool QGestureEvent::isAccepted() const

    Returns true is the event has been accepted; otherwise returns false.

    \sa QEvent::accepted
*/
/*!
    \fn void QGestureEvent::accept()

    Accepts the event, the equivalent of calling setAccepted(true).

    \sa QEvent::accept()
*/
/*!
    \fn void QGestureEvent::ignore()

    Ignores the event, the equivalent of calling setAccepted(false).

    \sa QEvent::ignore()
*/
#endif

QT_END_NAMESPACE