diff options
Diffstat (limited to 'src/declarative/graphicsitems/qmlgraphicsmousearea.cpp')
| -rw-r--r-- | src/declarative/graphicsitems/qmlgraphicsmousearea.cpp | 684 |
1 files changed, 684 insertions, 0 deletions
diff --git a/src/declarative/graphicsitems/qmlgraphicsmousearea.cpp b/src/declarative/graphicsitems/qmlgraphicsmousearea.cpp new file mode 100644 index 0000000..cc07989 --- /dev/null +++ b/src/declarative/graphicsitems/qmlgraphicsmousearea.cpp @@ -0,0 +1,684 @@ +/**************************************************************************** +** +** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies). +** All rights reserved. +** Contact: Nokia Corporation (qt-info@nokia.com) +** +** This file is part of the QtDeclarative module of the Qt Toolkit. +** +** $QT_BEGIN_LICENSE:LGPL$ +** No Commercial Usage +** This file contains pre-release code and may not be distributed. +** You may use this file in accordance with the terms and conditions +** contained in the Technology Preview License Agreement accompanying +** this package. +** +** GNU Lesser General Public License Usage +** Alternatively, this file may be used under the terms of the GNU Lesser +** General Public License version 2.1 as published by the Free Software +** Foundation and appearing in the file LICENSE.LGPL included in the +** packaging of this file. Please review the following information to +** ensure the GNU Lesser General Public License version 2.1 requirements +** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html. +** +** In addition, as a special exception, Nokia gives you certain additional +** rights. These rights are described in the Nokia Qt LGPL Exception +** version 1.1, included in the file LGPL_EXCEPTION.txt in this package. +** +** If you have questions regarding the use of this file, please contact +** Nokia at qt-info@nokia.com. +** +** +** +** +** +** +** +** +** $QT_END_LICENSE$ +** +****************************************************************************/ + +#include "qmlgraphicsmousearea_p.h" +#include "qmlgraphicsmousearea_p_p.h" + +#include "qmlgraphicsevents_p_p.h" + +#include <QGraphicsSceneMouseEvent> + +QT_BEGIN_NAMESPACE +static const int PressAndHoldDelay = 800; + +QmlGraphicsDrag::QmlGraphicsDrag(QObject *parent) +: QObject(parent), _target(0), _axis(XandYAxis), _xmin(0), _xmax(0), _ymin(0), _ymax(0) +{ +} + +QmlGraphicsDrag::~QmlGraphicsDrag() +{ +} + +QmlGraphicsItem *QmlGraphicsDrag::target() const +{ + return _target; +} + +void QmlGraphicsDrag::setTarget(QmlGraphicsItem *t) +{ + if (_target == t) + return; + _target = t; + emit targetChanged(); +} + +QmlGraphicsDrag::Axis QmlGraphicsDrag::axis() const +{ + return _axis; +} + +void QmlGraphicsDrag::setAxis(QmlGraphicsDrag::Axis a) +{ + if (_axis == a) + return; + _axis = a; + emit axisChanged(); +} + +qreal QmlGraphicsDrag::xmin() const +{ + return _xmin; +} + +void QmlGraphicsDrag::setXmin(qreal m) +{ + if (_xmin == m) + return; + _xmin = m; + emit minimumXChanged(); +} + +qreal QmlGraphicsDrag::xmax() const +{ + return _xmax; +} + +void QmlGraphicsDrag::setXmax(qreal m) +{ + if (_xmax == m) + return; + _xmax = m; + emit maximumXChanged(); +} + +qreal QmlGraphicsDrag::ymin() const +{ + return _ymin; +} + +void QmlGraphicsDrag::setYmin(qreal m) +{ + if (_ymin == m) + return; + _ymin = m; + emit minimumYChanged(); +} + +qreal QmlGraphicsDrag::ymax() const +{ + return _ymax; +} + +void QmlGraphicsDrag::setYmax(qreal m) +{ + if (_ymax == m) + return; + _ymax = m; + emit maximumYChanged(); +} + +QmlGraphicsMouseAreaPrivate::~QmlGraphicsMouseAreaPrivate() +{ + delete drag; +} + + +/*! + \qmlclass MouseArea QmlGraphicsMouseArea + \brief The MouseArea item enables simple mouse handling. + \inherits Item + + A MouseArea is typically used in conjunction with a visible item, + where the MouseArea effectively 'proxies' mouse handling for that + item. For example, we can put a MouseArea in a Rectangle that changes + the Rectangle color to red when clicked: + \snippet doc/src/snippets/declarative/mouseregion.qml 0 + + Many MouseArea signals pass a \l {MouseEvent}{mouse} parameter that contains + additional information about the mouse event, such as the position, button, + and any key modifiers. + + Below we have the previous + example extended so as to give a different color when you right click. + \snippet doc/src/snippets/declarative/mouseregion.qml 1 + + For basic key handling, see the \l {Keys}{Keys attached property}. + + MouseArea is an invisible item: it is never painted. + + \sa MouseEvent +*/ + +/*! + \qmlsignal MouseArea::onEntered() + + This handler is called when the mouse enters the mouse region. + + By default the onEntered handler is only called while a button is + pressed. Setting hoverEnabled to true enables handling of + onExited when no mouse button is pressed. + + \sa hoverEnabled +*/ + +/*! + \qmlsignal MouseArea::onExited() + + This handler is called when the mouse exists the mouse region. + + By default the onExited handler is only called while a button is + pressed. Setting hoverEnabled to true enables handling of + onExited when no mouse button is pressed. + + \sa hoverEnabled +*/ + +/*! + \qmlsignal MouseArea::onPositionChanged(MouseEvent mouse) + + This handler is called when the mouse position changes. + + The \l {MouseEvent}{mouse} parameter provides information about the mouse, including the x and y + position, and any buttons currently pressed. + + The \e accepted property of the MouseEvent parameter is ignored in this handler. + + By default the onPositionChanged handler is only called while a button is + pressed. Setting hoverEnabled to true enables handling of + onPositionChanged when no mouse button is pressed. +*/ + +/*! + \qmlsignal MouseArea::onClicked(mouse) + + This handler is called when there is a click. A click is defined as a press followed by a release, + both inside the MouseArea (pressing, moving outside the MouseArea, and then moving back inside and + releasing is also considered a click). + + The \l {MouseEvent}{mouse} parameter provides information about the click, including the x and y + position of the release of the click, and whether the click wasHeld. + + The \e accepted property of the MouseEvent parameter is ignored in this handler. +*/ + +/*! + \qmlsignal MouseArea::onPressed(mouse) + + This handler is called when there is a press. + The \l {MouseEvent}{mouse} parameter provides information about the press, including the x and y + position and which button was pressed. + + The \e accepted property of the MouseEvent parameter determines whether this MouseArea + will handle the press and all future mouse events until release. The default is to accept + the event and not allow other MouseArea beneath this one to handle the event. If \e accepted + is set to false, no further events will be sent to this MouseArea until the button is next + pressed. +*/ + +/*! + \qmlsignal MouseArea::onReleased(mouse) + + This handler is called when there is a release. + The \l {MouseEvent}{mouse} parameter provides information about the click, including the x and y + position of the release of the click, and whether the click wasHeld. + + The \e accepted property of the MouseEvent parameter is ignored in this handler. +*/ + +/*! + \qmlsignal MouseArea::onPressAndHold(mouse) + + This handler is called when there is a long press (currently 800ms). + The \l {MouseEvent}{mouse} parameter provides information about the press, including the x and y + position of the press, and which button is pressed. + + The \e accepted property of the MouseEvent parameter is ignored in this handler. +*/ + +/*! + \qmlsignal MouseArea::onDoubleClicked(mouse) + + This handler is called when there is a double-click (a press followed by a release followed by a press). + The \l {MouseEvent}{mouse} parameter provides information about the click, including the x and y + position of the release of the click, and whether the click wasHeld. + + The \e accepted property of the MouseEvent parameter is ignored in this handler. +*/ + +/*! + \internal + \class QmlGraphicsMouseArea + \brief The QmlGraphicsMouseArea class provides a simple mouse handling abstraction for use within Qml. + + \ingroup group_coreitems + + All QmlGraphicsItem derived classes can do mouse handling but the QmlGraphicsMouseArea class exposes mouse + handling data as properties and tracks flicking and dragging of the mouse. + + A QmlGraphicsMouseArea object can be instantiated in Qml using the tag \l MouseArea. + */ +QmlGraphicsMouseArea::QmlGraphicsMouseArea(QmlGraphicsItem *parent) + : QmlGraphicsItem(*(new QmlGraphicsMouseAreaPrivate), parent) +{ + Q_D(QmlGraphicsMouseArea); + d->init(); +} + +QmlGraphicsMouseArea::~QmlGraphicsMouseArea() +{ +} + +/*! + \qmlproperty real MouseArea::mouseX + \qmlproperty real MouseArea::mouseY + These properties hold the coordinates of the mouse. + + If the hoverEnabled property is false then these properties will only be valid + while a button is pressed, and will remain valid as long as the button is held + even if the mouse is moved outside the region. + + If hoverEnabled is true then these properties will be valid: + \list + \i when no button is pressed, but the mouse is within the MouseArea (containsMouse is true). + \i if a button is pressed and held, even if it has since moved out of the region. + \endlist + + The coordinates are relative to the MouseArea. +*/ +qreal QmlGraphicsMouseArea::mouseX() const +{ + Q_D(const QmlGraphicsMouseArea); + return d->lastPos.x(); +} + +qreal QmlGraphicsMouseArea::mouseY() const +{ + Q_D(const QmlGraphicsMouseArea); + return d->lastPos.y(); +} + +/*! + \qmlproperty bool MouseArea::enabled + This property holds whether the item accepts mouse events. +*/ +bool QmlGraphicsMouseArea::isEnabled() const +{ + Q_D(const QmlGraphicsMouseArea); + return d->absorb; +} + +void QmlGraphicsMouseArea::setEnabled(bool a) +{ + Q_D(QmlGraphicsMouseArea); + if (a != d->absorb) { + d->absorb = a; + emit enabledChanged(); + } +} +/*! + \qmlproperty MouseButtons MouseArea::pressedButtons + This property holds the mouse buttons currently pressed. + + It contains a bitwise combination of: + \list + \o Qt.LeftButton + \o Qt.RightButton + \o Qt.MidButton + \endlist + + The code below displays "right" when the right mouse buttons is pressed: + \code + Text { + text: mr.pressedButtons & Qt.RightButton ? "right" : "" + horizontalAlignment: Text.AlignHCenter + verticalAlignment: Text.AlignVCenter + MouseArea { + id: mr + acceptedButtons: Qt.LeftButton | Qt.RightButton + anchors.fill: parent + } + } + \endcode + + \sa acceptedButtons +*/ +Qt::MouseButtons QmlGraphicsMouseArea::pressedButtons() const +{ + Q_D(const QmlGraphicsMouseArea); + return d->lastButtons; +} + +void QmlGraphicsMouseArea::mousePressEvent(QGraphicsSceneMouseEvent *event) +{ + Q_D(QmlGraphicsMouseArea); + d->moved = false; + if (!d->absorb) + QmlGraphicsItem::mousePressEvent(event); + else { + d->longPress = false; + d->saveEvent(event); + if (d->drag) { + d->dragX = drag()->axis() & QmlGraphicsDrag::XAxis; + d->dragY = drag()->axis() & QmlGraphicsDrag::YAxis; + } + d->dragged = false; + setHovered(true); + d->start = event->pos(); + d->startScene = event->scenePos(); + // we should only start timer if pressAndHold is connected to. + if (d->isConnected("pressAndHold(QmlGraphicsMouseEvent*)")) + d->pressAndHoldTimer.start(PressAndHoldDelay, this); + setKeepMouseGrab(false); + event->setAccepted(setPressed(true)); + } +} + +void QmlGraphicsMouseArea::mouseMoveEvent(QGraphicsSceneMouseEvent *event) +{ + Q_D(QmlGraphicsMouseArea); + if (!d->absorb) { + QmlGraphicsItem::mouseMoveEvent(event); + return; + } + + d->saveEvent(event); + + // ### we should skip this if these signals aren't used + // ### can GV handle this for us? + bool contains = boundingRect().contains(d->lastPos); + if (d->hovered && !contains) + setHovered(false); + else if (!d->hovered && contains) + setHovered(true); + + if (d->drag && d->drag->target()) { + if (!d->moved) { + if (d->dragX) d->startX = drag()->target()->x(); + if (d->dragY) d->startY = drag()->target()->y(); + } + + QPointF startLocalPos; + QPointF curLocalPos; + if (drag()->target()->parent()) { + startLocalPos = drag()->target()->parentItem()->mapFromScene(d->startScene); + curLocalPos = drag()->target()->parentItem()->mapFromScene(event->scenePos()); + } else { + startLocalPos = d->startScene; + curLocalPos = event->scenePos(); + } + + const int dragThreshold = QApplication::startDragDistance(); + qreal dx = qAbs(curLocalPos.x() - startLocalPos.x()); + qreal dy = qAbs(curLocalPos.y() - startLocalPos.y()); + if ((d->dragX && !(dx < dragThreshold)) || (d->dragY && !(dy < dragThreshold))) + d->dragged = true; + if (!keepMouseGrab()) { + if ((!d->dragY && dy < dragThreshold && d->dragX && dx > dragThreshold) + || (!d->dragX && dx < dragThreshold && d->dragY && dy > dragThreshold) + || (d->dragX && d->dragY)) { + setKeepMouseGrab(true); + } + } + + if (d->dragX) { + qreal x = (curLocalPos.x() - startLocalPos.x()) + d->startX; + if (x < drag()->xmin()) + x = drag()->xmin(); + else if (x > drag()->xmax()) + x = drag()->xmax(); + drag()->target()->setX(x); + } + if (d->dragY) { + qreal y = (curLocalPos.y() - startLocalPos.y()) + d->startY; + if (y < drag()->ymin()) + y = drag()->ymin(); + else if (y > drag()->ymax()) + y = drag()->ymax(); + drag()->target()->setY(y); + } + } + d->moved = true; + QmlGraphicsMouseEvent me(d->lastPos.x(), d->lastPos.y(), d->lastButton, d->lastButtons, d->lastModifiers, false, d->longPress); + emit positionChanged(&me); +} + + +void QmlGraphicsMouseArea::mouseReleaseEvent(QGraphicsSceneMouseEvent *event) +{ + Q_D(QmlGraphicsMouseArea); + if (!d->absorb) { + QmlGraphicsItem::mouseReleaseEvent(event); + } else { + d->saveEvent(event); + setPressed(false); + // If we don't accept hover, we need to reset containsMouse. + if (!acceptHoverEvents()) + setHovered(false); + setKeepMouseGrab(false); + } +} + +void QmlGraphicsMouseArea::mouseDoubleClickEvent(QGraphicsSceneMouseEvent *event) +{ + Q_D(QmlGraphicsMouseArea); + if (!d->absorb) { + QmlGraphicsItem::mouseDoubleClickEvent(event); + } else { + QmlGraphicsItem::mouseDoubleClickEvent(event); + if (event->isAccepted()) { + // Only deliver the event if we have accepted the press. + d->saveEvent(event); + QmlGraphicsMouseEvent me(d->lastPos.x(), d->lastPos.y(), d->lastButton, d->lastButtons, d->lastModifiers, true, false); + emit this->doubleClicked(&me); + } + } +} + +void QmlGraphicsMouseArea::hoverEnterEvent(QGraphicsSceneHoverEvent *event) +{ + Q_D(QmlGraphicsMouseArea); + if (!d->absorb) + QmlGraphicsItem::hoverEnterEvent(event); + else + setHovered(true); +} + +void QmlGraphicsMouseArea::hoverMoveEvent(QGraphicsSceneHoverEvent *event) +{ + Q_D(QmlGraphicsMouseArea); + if (!d->absorb) { + QmlGraphicsItem::hoverEnterEvent(event); + } else { + d->lastPos = event->pos(); + QmlGraphicsMouseEvent me(d->lastPos.x(), d->lastPos.y(), Qt::NoButton, d->lastButtons, d->lastModifiers, false, d->longPress); + emit positionChanged(&me); + } +} + +void QmlGraphicsMouseArea::hoverLeaveEvent(QGraphicsSceneHoverEvent *event) +{ + Q_D(QmlGraphicsMouseArea); + if (!d->absorb) + QmlGraphicsItem::hoverLeaveEvent(event); + else + setHovered(false); +} + +bool QmlGraphicsMouseArea::sceneEvent(QEvent *event) +{ + bool rv = QmlGraphicsItem::sceneEvent(event); + if (event->type() == QEvent::UngrabMouse) { + Q_D(QmlGraphicsMouseArea); + if (d->pressed) { + // if our mouse grab has been removed (probably by Flickable), fix our + // state + d->pressed = false; + setKeepMouseGrab(false); + emit pressedChanged(); + //emit hoveredChanged(); + } + } + return rv; +} + +void QmlGraphicsMouseArea::timerEvent(QTimerEvent *event) +{ + Q_D(QmlGraphicsMouseArea); + if (event->timerId() == d->pressAndHoldTimer.timerId()) { + d->pressAndHoldTimer.stop(); + if (d->pressed && d->dragged == false && d->hovered == true) { + d->longPress = true; + QmlGraphicsMouseEvent me(d->lastPos.x(), d->lastPos.y(), d->lastButton, d->lastButtons, d->lastModifiers, false, d->longPress); + emit pressAndHold(&me); + } + } +} + +/*! + \qmlproperty bool MouseArea::hoverEnabled + This property holds whether hover events are handled. + + By default, mouse events are only handled in response to a button event, or when a button is + pressed. Hover enables handling of all mouse events even when no mouse button is + pressed. + + This property affects the containsMouse property and the onEntered, onExited and onPositionChanged signals. +*/ + +/*! + \qmlproperty bool MouseArea::containsMouse + This property holds whether the mouse is currently inside the mouse region. + + \warning This property is not updated if the region moves under the mouse: \e containsMouse will not change. + In addition, if hoverEnabled is false, containsMouse will only be valid when the mouse is pressed. +*/ +bool QmlGraphicsMouseArea::hovered() const +{ + Q_D(const QmlGraphicsMouseArea); + return d->hovered; +} + +/*! + \qmlproperty bool MouseArea::pressed + This property holds whether the mouse region is currently pressed. +*/ +bool QmlGraphicsMouseArea::pressed() const +{ + Q_D(const QmlGraphicsMouseArea); + return d->pressed; +} + +void QmlGraphicsMouseArea::setHovered(bool h) +{ + Q_D(QmlGraphicsMouseArea); + if (d->hovered != h) { + d->hovered = h; + emit hoveredChanged(); + d->hovered ? emit entered() : emit exited(); + } +} + +/*! + \qmlproperty Qt::MouseButtons MouseArea::acceptedButtons + This property holds the mouse buttons that the mouse region reacts to. + + The available buttons are: + \list + \o Qt.LeftButton + \o Qt.RightButton + \o Qt.MidButton + \endlist + + To accept more than one button the flags can be combined with the + "|" (or) operator: + + \code + MouseArea { acceptedButtons: Qt.LeftButton | Qt.RightButton } + \endcode + + The default is to accept the Left button. +*/ +Qt::MouseButtons QmlGraphicsMouseArea::acceptedButtons() const +{ + return acceptedMouseButtons(); +} + +void QmlGraphicsMouseArea::setAcceptedButtons(Qt::MouseButtons buttons) +{ + if (buttons != acceptedMouseButtons()) { + setAcceptedMouseButtons(buttons); + emit acceptedButtonsChanged(); + } +} + +bool QmlGraphicsMouseArea::setPressed(bool p) +{ + Q_D(QmlGraphicsMouseArea); + bool isclick = d->pressed == true && p == false && d->dragged == false && d->hovered == true; + + if (d->pressed != p) { + d->pressed = p; + QmlGraphicsMouseEvent me(d->lastPos.x(), d->lastPos.y(), d->lastButton, d->lastButtons, d->lastModifiers, isclick, d->longPress); + if (d->pressed) { + emit positionChanged(&me); + emit pressed(&me); + } else { + emit released(&me); + if (isclick) + emit clicked(&me); + } + + emit pressedChanged(); + return me.isAccepted(); + } + return false; +} + +QmlGraphicsDrag *QmlGraphicsMouseArea::drag() +{ + Q_D(QmlGraphicsMouseArea); + if (!d->drag) + d->drag = new QmlGraphicsDrag; + return d->drag; +} + +/*! + \qmlproperty Item MouseArea::drag.target + \qmlproperty Axis MouseArea::drag.axis + \qmlproperty real MouseArea::drag.minimumX + \qmlproperty real MouseArea::drag.maximumX + \qmlproperty real MouseArea::drag.minimumY + \qmlproperty real MouseArea::drag.maximumY + + drag provides a convenient way to make an item draggable. + + \list + \i \c target specifies the item to drag. + \i \c axis specifies whether dragging can be done horizontally (XAxis), vertically (YAxis), or both (XandYAxis) + \i the minimum and maximum properties limit how far the target can be dragged along the corresponding axes. + \endlist + + The following example uses drag to reduce the opacity of an image as it moves to the right: + \snippet doc/src/snippets/declarative/drag.qml 0 +*/ + +QT_END_NAMESPACE |