Long live Qt!

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+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** Contact: Qt Software Information (qt-info@nokia.com)
+**
+** This file is part of the QtGui 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 either Technology Preview License Agreement or the
+** Beta Release License Agreement.
+**
+** 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 1.0, included in the file LGPL_EXCEPTION.txt in this
+** package.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3.0 as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU General Public License version 3.0 requirements will be
+** met: http://www.gnu.org/copyleft/gpl.html.
+**
+** If you are unsure which license is appropriate for your use, please
+** contact the sales department at qt-sales@nokia.com.
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "qshortcut.h"
+#include "private/qwidget_p.h"
+
+#ifndef QT_NO_SHORTCUT
+#include <qevent.h>
+#include <qwhatsthis.h>
+#include <qmenu.h>
+#include <qapplication.h>
+#include <private/qapplication_p.h>
+#include <private/qshortcutmap_p.h>
+
+QT_BEGIN_NAMESPACE
+
+#define QAPP_CHECK(functionName) \
+    if (!qApp) { \
+        qWarning("QShortcut: Initialize QApplication before calling '" functionName "'."); \
+        return; \
+    }
+
+/*!
+    \class QShortcut
+    \brief The QShortcut class is used to create keyboard shortcuts.
+
+    \ingroup events
+    \mainclass
+
+    The QShortcut class provides a way of connecting keyboard
+    shortcuts to Qt's \l{signals and slots} mechanism, so that
+    objects can be informed when a shortcut is executed. The shortcut
+    can be set up to contain all the key presses necessary to
+    describe a keyboard shortcut, including the states of modifier
+    keys such as \gui Shift, \gui Ctrl, and \gui Alt.
+
+    \target mnemonic
+
+    On certain widgets, using '&' in front of a character will
+    automatically create a mnemonic (a shortcut) for that character,
+    e.g. "E&xit" will create the shortcut \gui Alt+X (use '&&' to
+    display an actual ampersand). The widget might consume and perform
+    an action on a given shortcut. On X11 the ampersand will not be
+    shown and the character will be underlined. On Windows, shortcuts
+    are normally not displayed until the user presses the \gui Alt
+    key, but this is a setting the user can change. On Mac, shortcuts
+    are disabled by default. Call qt_set_sequence_auto_mnemonic() to
+    enable them. However, because mnemonic shortcuts do not fit in
+    with Aqua's guidelines, Qt will not show the shortcut character
+    underlined.
+
+    For applications that use menus, it may be more convenient to
+    use the convenience functions provided in the QMenu class to
+    assign keyboard shortcuts to menu items as they are created.
+    Alternatively, shortcuts may be associated with other types of
+    actions in the QAction class.
+
+    The simplest way to create a shortcut for a particular widget is
+    to construct the shortcut with a key sequence. For example:
+
+    \snippet doc/src/snippets/code/src_gui_kernel_qshortcut.cpp 0
+
+    When the user types the \l{QKeySequence}{key sequence}
+    for a given shortcut, the shortcut's activated() signal is
+    emitted. (In the case of ambiguity, the activatedAmbiguously()
+    signal is emitted.) A shortcut is "listened for" by Qt's event
+    loop when the shortcut's parent widget is receiving events.
+
+    A shortcut's key sequence can be set with setKey() and retrieved
+    with key(). A shortcut can be enabled or disabled with
+    setEnabled(), and can have "What's This?" help text set with
+    setWhatsThis().
+
+    \sa QShortcutEvent, QKeySequence, QAction
+*/
+
+/*!
+    \fn QWidget *QShortcut::parentWidget() const
+
+    Returns the shortcut's parent widget.
+*/
+
+/*!
+    \fn void QShortcut::activated()
+
+    This signal is emitted when the user types the shortcut's key
+    sequence.
+
+    \sa activatedAmbiguously()
+*/
+
+/*!
+    \fn void QShortcut::activatedAmbiguously()
+
+    When a key sequence is being typed at the keyboard, it is said to
+    be ambiguous as long as it matches the start of more than one
+    shortcut.
+
+    When a shortcut's key sequence is completed,
+    activatedAmbiguously() is emitted if the key sequence is still
+    ambiguous (i.e., it is the start of one or more other shortcuts).
+    The activated() signal is not emitted in this case.
+
+    \sa activated()
+*/
+
+/*
+    \internal
+    Private data accessed through d-pointer.
+*/
+class QShortcutPrivate : public QObjectPrivate
+{
+    Q_DECLARE_PUBLIC(QShortcut)
+public:
+    QShortcutPrivate() : sc_context(Qt::WindowShortcut), sc_enabled(true), sc_autorepeat(true), sc_id(0) {}
+    QKeySequence sc_sequence;
+    Qt::ShortcutContext sc_context;
+    bool sc_enabled;
+    bool sc_autorepeat;
+    int sc_id;
+    QString sc_whatsthis;
+    void redoGrab(QShortcutMap &map);
+};
+
+void QShortcutPrivate::redoGrab(QShortcutMap &map)
+{
+    Q_Q(QShortcut);
+    QWidget *parent = q->parentWidget();
+    if (!parent) {
+        qWarning("QShortcut: No widget parent defined");
+        return;
+    }
+
+    if (sc_id)
+        map.removeShortcut(sc_id, q);
+    if (sc_sequence.isEmpty())
+        return;
+    sc_id = map.addShortcut(q, sc_sequence, sc_context);
+    if (!sc_enabled)
+        map.setShortcutEnabled(false, sc_id, q);
+    if (!sc_autorepeat)
+        map.setShortcutAutoRepeat(false, sc_id, q);
+}
+
+/*!
+    Constructs a QShortcut object for the \a parent widget. Since no
+    shortcut key sequence is specified, the shortcut will not emit any
+    signals.
+
+    \sa setKey()
+*/
+QShortcut::QShortcut(QWidget *parent)
+    : QObject(*new QShortcutPrivate, parent)
+{
+    Q_ASSERT(parent != 0);
+}
+
+/*!
+    Constructs a QShortcut object for the \a parent widget. The shortcut
+    operates on its parent, listening for \l{QShortcutEvent}s that
+    match the \a key sequence. Depending on the ambiguity of the
+    event, the shortcut will call the \a member function, or the \a
+    ambiguousMember function, if the key press was in the shortcut's
+    \a context.
+*/
+QShortcut::QShortcut(const QKeySequence &key, QWidget *parent,
+                     const char *member, const char *ambiguousMember,
+                     Qt::ShortcutContext context)
+    : QObject(*new QShortcutPrivate, parent)
+{
+    QAPP_CHECK("QShortcut");
+
+    Q_D(QShortcut);
+    Q_ASSERT(parent != 0);
+    d->sc_context = context;
+    d->sc_sequence = key;
+    d->redoGrab(qApp->d_func()->shortcutMap);
+    if (member)
+        connect(this, SIGNAL(activated()), parent, member);
+    if (ambiguousMember)
+        connect(this, SIGNAL(activatedAmbiguously()), parent, ambiguousMember);
+}
+
+/*!
+    Destroys the shortcut.
+*/
+QShortcut::~QShortcut()
+{
+    Q_D(QShortcut);
+    if (qApp)
+        qApp->d_func()->shortcutMap.removeShortcut(d->sc_id, this);
+}
+
+/*!
+    \property QShortcut::key
+    \brief the shortcut's key sequence
+
+    This is a key sequence with an optional combination of Shift, Ctrl,
+    and Alt. The key sequence may be supplied in a number of ways:
+
+    \snippet doc/src/snippets/code/src_gui_kernel_qshortcut.cpp 1
+
+    By default, this property contains an empty key sequence.
+*/
+void QShortcut::setKey(const QKeySequence &key)
+{
+    Q_D(QShortcut);
+    if (d->sc_sequence == key)
+        return;
+    QAPP_CHECK("setKey");
+    d->sc_sequence = key;
+    d->redoGrab(qApp->d_func()->shortcutMap);
+}
+
+QKeySequence QShortcut::key() const
+{
+    Q_D(const QShortcut);
+    return d->sc_sequence;
+}
+
+/*!
+    \property QShortcut::enabled
+    \brief whether the shortcut is enabled
+
+    An enabled shortcut emits the activated() or activatedAmbiguously()
+    signal when a QShortcutEvent occurs that matches the shortcut's
+    key() sequence.
+
+    If the application is in \c WhatsThis mode the shortcut will not emit
+    the signals, but will show the "What's This?" text instead.
+
+    By default, this property is true.
+
+    \sa whatsThis
+*/
+void QShortcut::setEnabled(bool enable)
+{
+    Q_D(QShortcut);
+    if (d->sc_enabled == enable)
+        return;
+    QAPP_CHECK("setEnabled");
+    d->sc_enabled = enable;
+    qApp->d_func()->shortcutMap.setShortcutEnabled(enable, d->sc_id, this);
+}
+
+bool QShortcut::isEnabled() const
+{
+    Q_D(const QShortcut);
+    return d->sc_enabled;
+}
+
+/*!
+    \property QShortcut::context
+    \brief the context in which the shortcut is valid
+
+    A shortcut's context decides in which circumstances a shortcut is
+    allowed to be triggered. The normal context is Qt::WindowShortcut,
+    which allows the shortcut to trigger if the parent (the widget
+    containing the shortcut) is a subwidget of the active top-level
+    window.
+
+    By default, this property is set to Qt::WindowShortcut.
+*/
+void QShortcut::setContext(Qt::ShortcutContext context)
+{
+    Q_D(QShortcut);
+    if(d->sc_context == context)
+        return;
+    QAPP_CHECK("setContext");
+    d->sc_context = context;
+    d->redoGrab(qApp->d_func()->shortcutMap);
+}
+
+Qt::ShortcutContext QShortcut::context()
+{
+    Q_D(QShortcut);
+    return d->sc_context;
+}
+
+/*!
+    \property QShortcut::whatsThis
+    \brief the shortcut's "What's This?" help text
+
+    The text will be shown when the application is in "What's
+    This?" mode and the user types the shortcut key() sequence.
+
+    To set "What's This?" help on a menu item (with or without a
+    shortcut key), set the help on the item's action.
+
+    By default, this property contains an empty string.
+
+    \sa QWhatsThis::inWhatsThisMode(), QAction::setWhatsThis()
+*/
+void QShortcut::setWhatsThis(const QString &text)
+{
+    Q_D(QShortcut);
+    d->sc_whatsthis = text;
+}
+
+QString QShortcut::whatsThis() const
+{
+    Q_D(const QShortcut);
+    return d->sc_whatsthis;
+}
+
+/*!
+    \property QShortcut::autoRepeat
+    \brief whether the shortcut can auto repeat
+    \since 4.2
+
+    If true, the shortcut will auto repeat when the keyboard shortcut
+    combination is held down, provided that keyboard auto repeat is
+    enabled on the system.
+    The default value is true.
+*/
+void QShortcut::setAutoRepeat(bool on)
+{
+    Q_D(QShortcut);
+    if (d->sc_autorepeat == on)
+        return;
+    QAPP_CHECK("setAutoRepeat");
+    d->sc_autorepeat = on;
+    qApp->d_func()->shortcutMap.setShortcutAutoRepeat(on, d->sc_id, this);
+}
+
+bool QShortcut::autoRepeat() const
+{
+    Q_D(const QShortcut);
+    return d->sc_autorepeat;
+}
+
+/*!
+    Returns the shortcut's ID.
+
+    \sa QShortcutEvent::shortcutId()
+*/
+int QShortcut::id() const
+{
+    Q_D(const QShortcut);
+    return d->sc_id;
+}
+
+/*!
+    \internal
+*/
+bool QShortcut::event(QEvent *e)
+{
+    Q_D(QShortcut);
+    bool handled = false;
+    if (d->sc_enabled && e->type() == QEvent::Shortcut) {
+        QShortcutEvent *se = static_cast<QShortcutEvent *>(e);
+        if (se->shortcutId() == d->sc_id && se->key() == d->sc_sequence){
+#ifndef QT_NO_WHATSTHIS
+            if (QWhatsThis::inWhatsThisMode()) {
+                QWhatsThis::showText(QCursor::pos(), d->sc_whatsthis);
+                handled = true;
+            } else
+#endif
+            if (se->isAmbiguous())
+                emit activatedAmbiguously();
+            else
+                emit activated();
+            handled = true;
+        }
+    }
+    return handled;
+}
+#endif // QT_NO_SHORTCUT
+
+QT_END_NAMESPACE