Long live Qt 4.5!

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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 Qt3Support 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 "q3accel.h"
+
+#include "q3signal.h"
+#include "qapplication.h"
+#include "qwidget.h"
+#include "q3ptrlist.h"
+#include "qwhatsthis.h"
+#include "qpointer.h"
+#include "qstatusbar.h"
+#include "qdockwidget.h"
+#include "qevent.h"
+#include "qkeysequence.h"
+#include "private/qapplication_p.h"
+
+QT_BEGIN_NAMESPACE
+
+using namespace Qt;
+
+/*!
+    \class Q3Accel
+    \brief The Q3Accel class handles keyboard accelerator and shortcut keys.
+
+    \compat
+
+    A keyboard accelerator triggers an action when a certain key
+    combination is pressed. The accelerator handles all keyboard
+    activity for all the children of one top-level widget, so it is
+    not affected by the keyboard focus.
+
+    In most cases, you will not need to use this class directly. Use
+    the QAction class to create actions with accelerators that can be
+    used in both menus and toolbars. If you're only interested in
+    menus use Q3MenuData::insertItem() or Q3MenuData::setAccel() to make
+    accelerators for operations that are also available on menus. Many
+    widgets automatically generate accelerators, such as QAbstractButton,
+    QGroupBox, QLabel (with QLabel::setBuddy()), QMenuBar, and QTabBar.
+    Example:
+    \snippet doc/src/snippets/code/src_qt3support_other_q3accel.cpp 0
+
+    A Q3Accel contains a list of accelerator items that can be
+    manipulated using insertItem(), removeItem(), clear(), key() and
+    findKey().
+
+    Each accelerator item consists of an identifier and a \l
+    QKeySequence. A single key sequence consists of a keyboard code
+    combined with modifiers (Qt::SHIFT, Qt::CTRL, Qt::ALT, or
+    Qt::UNICODE_ACCEL). For example, Qt::CTRL + Qt::Key_P could be a shortcut
+    for printing a document. As an alternative, use Qt::UNICODE_ACCEL with the
+    unicode code point of the character. For example, Qt::UNICODE_ACCEL
+    + 'A' gives the same accelerator as Qt::Key_A.
+
+    When an accelerator key is pressed, the accelerator sends out the
+    signal activated() with a number that identifies this particular
+    accelerator item. Accelerator items can also be individually
+    connected, so that two different keys will activate two different
+    slots (see connectItem() and disconnectItem()).
+
+    The activated() signal is \e not emitted when two or more
+    accelerators match the same key.  Instead, the first matching
+    accelerator sends out the activatedAmbiguously() signal. By
+    pressing the key multiple times, users can navigate between all
+    matching accelerators. Some standard controls like QPushButton and
+    QCheckBox connect the activatedAmbiguously() signal to the
+    harmless setFocus() slot, whereas activated() is connected to a
+    slot invoking the button's action. Most controls, like QLabel and
+    QTabBar, treat activated() and activatedAmbiguously() as
+    equivalent.
+
+    Use setEnabled() to enable or disable all the items in an
+    accelerator, or setItemEnabled() to enable or disable individual
+    items. An item is active only when both the Q3Accel and the item
+    itself are enabled.
+
+    The function setWhatsThis() specifies a help text that appears
+    when the user presses an accelerator key in What's This mode.
+
+    The accelerator will be deleted when \e parent is deleted,
+    and will consume relevant key events until then.
+
+    Please note that the accelerator
+    \snippet doc/src/snippets/code/src_qt3support_other_q3accel.cpp 1
+    can be triggered with both the 'M' key, and with Shift+M,
+    unless a second accelerator is defined for the Shift+M
+    combination.
+
+
+    Example:
+    \snippet doc/src/snippets/code/src_qt3support_other_q3accel.cpp 2
+
+    \sa QKeyEvent QWidget::keyPressEvent()
+    QAbstractButton::setAccel() QLabel::setBuddy() QKeySequence
+*/
+
+
+struct Q3AccelItem {                                // internal accelerator item
+    Q3AccelItem(const QKeySequence &k, int i)
+        { key=k; id=i; enabled=true; signal=0; }
+   ~Q3AccelItem()               { delete signal; }
+    int id;
+    QKeySequence key;
+    bool enabled;
+    Q3Signal *signal;
+    QString whatsthis;
+};
+
+
+typedef Q3PtrList<Q3AccelItem> Q3AccelList; // internal accelerator list
+
+class Q3AccelPrivate {
+public:
+    Q3AccelPrivate(Q3Accel* p);
+    ~Q3AccelPrivate();
+    Q3AccelList aitems;
+    bool enabled;
+    QPointer<QWidget> watch;
+    bool ignorewhatsthis;
+    Q3Accel* parent;
+
+    void activate(Q3AccelItem* item);
+    void activateAmbiguously(Q3AccelItem* item);
+};
+
+class Q3AccelManager {
+public:
+    static Q3AccelManager* self() { return self_ptr ? self_ptr : new Q3AccelManager; }
+    void registerAccel(Q3AccelPrivate* a) { accels.append(a); }
+    void unregisterAccel(Q3AccelPrivate* a) { accels.removeRef(a); if (accels.isEmpty()) delete this; }
+    bool tryAccelEvent(QWidget* w, QKeyEvent* e);
+    bool dispatchAccelEvent(QWidget* w, QKeyEvent* e);
+    bool tryComposeUnicode(QWidget* w, QKeyEvent* e);
+
+private:
+    Q3AccelManager()
+        : currentState(QKeySequence::NoMatch), clash(-1), metaComposeUnicode(false),composedUnicode(0)
+        { setFuncPtr(); self_ptr = this; }
+    ~Q3AccelManager() { self_ptr = 0; }
+    void setFuncPtr();
+
+    bool correctSubWindow(QWidget *w, Q3AccelPrivate* d);
+    QKeySequence::SequenceMatch match(QKeyEvent* e, Q3AccelItem* item, QKeySequence& temp);
+    int translateModifiers(ButtonState state);
+
+    Q3PtrList<Q3AccelPrivate> accels;
+    static Q3AccelManager* self_ptr;
+    QKeySequence::SequenceMatch currentState;
+    QKeySequence intermediate;
+    int clash;
+    bool metaComposeUnicode;
+    int composedUnicode;
+};
+Q3AccelManager* Q3AccelManager::self_ptr = 0;
+
+bool Q_COMPAT_EXPORT qt_tryAccelEvent(QWidget* w, QKeyEvent*  e){
+    return Q3AccelManager::self()->tryAccelEvent(w, e);
+}
+
+bool Q_COMPAT_EXPORT qt_dispatchAccelEvent(QWidget* w, QKeyEvent*  e){
+    return Q3AccelManager::self()->dispatchAccelEvent(w, e);
+}
+
+bool Q_COMPAT_EXPORT qt_tryComposeUnicode(QWidget* w, QKeyEvent*  e){
+    return Q3AccelManager::self()->tryComposeUnicode(w, e);
+}
+
+void Q3AccelManager::setFuncPtr() {
+    if (qApp->d_func()->qt_compat_used)
+        return;
+    QApplicationPrivate *data = static_cast<QApplicationPrivate*>(qApp->d_ptr);
+    data->qt_tryAccelEvent = qt_tryAccelEvent;
+    data->qt_tryComposeUnicode = qt_tryComposeUnicode;
+    data->qt_dispatchAccelEvent = qt_dispatchAccelEvent;
+    data->qt_compat_used = true;
+}
+
+#ifdef Q_WS_MAC
+static bool qt_accel_no_shortcuts = true;
+#else
+static bool qt_accel_no_shortcuts = false;
+#endif
+void Q_COMPAT_EXPORT qt_set_accel_auto_shortcuts(bool b) { qt_accel_no_shortcuts = b; }
+
+/*
+    \internal
+    Returns true if the accel is in the current subwindow, else false.
+*/
+bool Q3AccelManager::correctSubWindow(QWidget* w, Q3AccelPrivate* d) {
+#if !defined (Q_OS_MACX)
+     if (!d->watch || !d->watch->isVisible() || !d->watch->isEnabled())
+#else
+    if (!d->watch || (!d->watch->isVisible() && !d->watch->inherits("QMenuBar")) || !d->watch->isEnabled())
+#endif
+        return false;
+    QWidget* tlw = w->window();
+    QWidget* wtlw = d->watch->window();
+
+    /* if we live in a floating dock window, keep our parent's
+     * accelerators working */
+#ifndef QT_NO_MAINWINDOW
+    if ((tlw->windowType() == Qt::Dialog) && tlw->parentWidget() && qobject_cast<QDockWidget*>(tlw))
+        return tlw->parentWidget()->window() == wtlw;
+
+    if (wtlw  != tlw)
+        return false;
+#endif
+    /* if we live in a MDI subwindow, ignore the event if we are
+       not the active document window */
+    QWidget* sw = d->watch;
+    while (sw && sw->windowType() != Qt::SubWindow)
+        sw = sw->parentWidget(true);
+    if (sw)  { // we are in a subwindow indeed
+        QWidget* fw = w;
+        while (fw && fw != sw)
+            fw = fw->parentWidget(true);
+        if (fw != sw) // focus widget not in our subwindow
+            return false;
+    }
+    return true;
+}
+
+inline int Q3AccelManager::translateModifiers(ButtonState state)
+{
+    int result = 0;
+    if (state & ShiftButton)
+        result |= SHIFT;
+    if (state & ControlButton)
+        result |= CTRL;
+    if (state & MetaButton)
+        result |= META;
+    if (state & AltButton)
+        result |= ALT;
+    return result;
+}
+
+/*
+    \internal
+    Matches the current intermediate key sequence + the latest
+    keyevent, with and AccelItem. Returns Identical,
+    PartialMatch or NoMatch, and fills \a temp with the
+    resulting key sequence.
+*/
+QKeySequence::SequenceMatch Q3AccelManager::match(QKeyEvent *e, Q3AccelItem* item, QKeySequence& temp)
+{
+    QKeySequence::SequenceMatch result = QKeySequence::NoMatch;
+    int index = intermediate.count();
+    temp = intermediate;
+
+    int modifier = translateModifiers(e->state());
+
+    if (e->key() && e->key() != Key_unknown) {
+        int key = e->key()  | modifier;
+        if (e->key() == Key_BackTab) {
+            /*
+            In QApplication, we map shift+tab to shift+backtab.
+            This code here reverts the mapping in a way that keeps
+            backtab and shift+tab accelerators working, in that
+            order, meaning backtab has priority.*/
+            key &= ~SHIFT;
+
+            temp.setKey(key, index);
+            if (QKeySequence::NoMatch != (result = temp.matches(item->key)))
+                return result;
+            if (e->state() & ShiftButton)
+                key |= SHIFT;
+            key = Key_Tab | (key & MODIFIER_MASK);
+            temp.setKey(key, index);
+            if (QKeySequence::NoMatch != (result = temp.matches(item->key)))
+                return result;
+        } else {
+            temp.setKey(key, index);
+            if (QKeySequence::NoMatch != (result = temp.matches(item->key)))
+                return result;
+        }
+
+        if (key == Key_BackTab) {
+            if (e->state() & ShiftButton)
+                key |= SHIFT;
+            temp.setKey(key, index);
+            if (QKeySequence::NoMatch != (result = temp.matches(item->key)))
+                return result;
+        }
+    }
+    if (!e->text().isEmpty()) {
+        temp.setKey((int)e->text()[0].unicode() | UNICODE_ACCEL | modifier, index);
+        result = temp.matches(item->key);
+    }
+    return result;
+}
+
+bool Q3AccelManager::tryAccelEvent(QWidget* w, QKeyEvent* e)
+{
+    if (QKeySequence::NoMatch == currentState) {
+        e->t = QEvent::AccelOverride;
+        e->ignore();
+        QApplication::sendSpontaneousEvent(w, e);
+        if (e->isAccepted())
+            return false;
+    }
+    e->t = QEvent::Accel;
+    e->ignore();
+    QApplication::sendSpontaneousEvent(w, e);
+    return e->isAccepted();
+}
+
+bool Q3AccelManager::tryComposeUnicode(QWidget* w, QKeyEvent* e)
+{
+    if (metaComposeUnicode) {
+        int value = e->key() - Key_0;
+        // Ignore acceloverrides so we don't trigger
+        // accels on keypad when Meta compose is on
+        if ((e->type() == QEvent::AccelOverride) &&
+             (e->state() == Qt::Keypad + Qt::MetaButton)) {
+            e->accept();
+        // Meta compose start/continue
+        } else if ((e->type() == QEvent::KeyPress) &&
+             (e->state() == Qt::Keypad + Qt::MetaButton)) {
+            if (value >= 0 && value <= 9) {
+                composedUnicode *= 10;
+                composedUnicode += value;
+                return true;
+            } else {
+                // Composing interrupted, dispatch!
+                if (composedUnicode) {
+                    QChar ch(composedUnicode);
+                    QString s(ch);
+                    QKeyEvent kep(QEvent::KeyPress, 0, ch.row() ? 0 : ch.cell(), 0, s);
+                    QKeyEvent ker(QEvent::KeyRelease, 0, ch.row() ? 0 : ch.cell(), 0, s);
+                    QApplication::sendEvent(w, &kep);
+                    QApplication::sendEvent(w, &ker);
+                }
+                composedUnicode = 0;
+                return true;
+            }
+        // Meta compose end, dispatch
+        } else if ((e->type() == QEvent::KeyRelease) &&
+                    (e->key() == Key_Meta) &&
+                    (composedUnicode != 0)) {
+            if ((composedUnicode > 0) &&
+                 (composedUnicode < 0xFFFE)) {
+                QChar ch(composedUnicode);
+                QString s(ch);
+                QKeyEvent kep(QEvent::KeyPress, 0, ch.row() ? 0 : ch.cell(), 0, s);
+                QKeyEvent ker(QEvent::KeyRelease, 0, ch.row() ? 0 : ch.cell(), 0, s);
+                QApplication::sendEvent(w, &kep);
+                QApplication::sendEvent(w, &ker);
+            }
+            composedUnicode = 0;
+            return true;
+        }
+    }
+    return false;
+}
+
+/*
+    \internal
+    Checks for possible accelerators, if no widget
+    ate the keypres, or we are in the middle of a
+    partial key sequence.
+*/
+bool Q3AccelManager::dispatchAccelEvent(QWidget* w, QKeyEvent* e)
+{
+#ifndef QT_NO_STATUSBAR
+    // Needs to be declared and used here because of "goto doclash"
+    QStatusBar* mainStatusBar = 0;
+#endif
+
+    // Modifiers can NOT be accelerators...
+    if (e->key() >= Key_Shift &&
+         e->key() <= Key_Alt)
+         return false;
+
+    QKeySequence::SequenceMatch result = QKeySequence::NoMatch;
+    QKeySequence tocheck, partial;
+    Q3AccelPrivate* accel = 0;
+    Q3AccelItem* item = 0;
+    Q3AccelPrivate* firstaccel = 0;
+    Q3AccelItem* firstitem = 0;
+    Q3AccelPrivate* lastaccel = 0;
+    Q3AccelItem* lastitem = 0;
+
+    QKeyEvent pe = *e;
+    int n = -1;
+    int hasShift = (e->state()&Qt::ShiftButton)?1:0;
+    bool identicalDisabled = false;
+    bool matchFound = false;
+    do {
+        accel = accels.first();
+        matchFound = false;
+        while (accel) {
+            if (correctSubWindow(w, accel)) {
+                if (accel->enabled) {
+                    item = accel->aitems.last();
+                    while(item) {
+                        if (QKeySequence::Identical == (result = match(&pe, item, tocheck))) {
+                            if (item->enabled) {
+                                if (!firstaccel) {
+                                    firstaccel = accel;
+                                    firstitem = item;
+                                }
+                                lastaccel = accel;
+                                lastitem = item;
+                                n++;
+                                matchFound = true;
+                                if (n > QMAX(clash,0))
+                                    goto doclash;
+                            } else {
+                                identicalDisabled = true;
+                            }
+                        }
+                        if (item->enabled && QKeySequence::PartialMatch == result) {
+                            partial = tocheck;
+                            matchFound = true;
+                        }
+                        item = accel->aitems.prev();
+                    }
+                } else {
+                    item = accel->aitems.last();
+                    while(item) {
+                        if (QKeySequence::Identical == match(&pe, item, tocheck))
+                            identicalDisabled = true;
+                        item = accel->aitems.prev();
+                    }
+                }
+            }
+            accel = accels.next();
+        }
+        pe = QKeyEvent(QEvent::Accel, pe.key(), pe.ascii(), pe.state()&~Qt::ShiftButton, pe.text());
+    } while (hasShift-- && !matchFound && !identicalDisabled);
+
+#ifndef QT_NO_STATUSBAR
+    mainStatusBar = (QStatusBar*) w->window()->child(0, "QStatusBar");
+#endif
+    if (n < 0) { // no match found
+        currentState = partial.count() ? QKeySequence::PartialMatch : QKeySequence::NoMatch;
+#ifndef QT_NO_STATUSBAR
+        // Only display message if we are, or were, in a partial match
+        if (mainStatusBar && (QKeySequence::PartialMatch == currentState || intermediate.count())) {
+            if (currentState == QKeySequence::PartialMatch) {
+                mainStatusBar->showMessage((QString)partial + QLatin1String(", ..."));
+            } else if (!identicalDisabled) {
+                QString message = Q3Accel::tr("%1, %2 not defined").
+                    arg((QString)intermediate).
+                    arg(QKeySequence::encodeString(e->key() | translateModifiers(e->state())));
+                mainStatusBar->showMessage(message, 2000);
+                // Since we're a NoMatch, reset the clash count
+                clash = -1;
+            } else {
+            	mainStatusBar->clearMessage();
+            }
+        }
+#endif
+
+        bool eatKey = (QKeySequence::PartialMatch == currentState || intermediate.count());
+        intermediate = partial;
+        if (eatKey)
+            e->accept();
+        return eatKey;
+    } else if (n == 0) { // found exactly one match
+        clash = -1; // reset
+#ifndef QT_NO_STATUSBAR
+        if (currentState == QKeySequence::PartialMatch && mainStatusBar)
+                mainStatusBar->clearMessage();
+#endif
+        currentState = QKeySequence::NoMatch; // Free sequence keylock
+        intermediate = QKeySequence();
+        lastaccel->activate(lastitem);
+        e->accept();
+        return true;
+    }
+
+ doclash: // found more than one match
+#ifndef QT_NO_STATUSBAR
+    if (!mainStatusBar) // if "goto doclash", we need to get status bar again.
+        mainStatusBar = (QStatusBar*) w->window()->child(0, "QStatusBar");
+#endif
+
+    QString message = Q3Accel::tr("Ambiguous %1 not handled").arg((QString)tocheck);
+    if (clash >= 0 && n > clash) { // pick next  match
+        intermediate = QKeySequence();
+        currentState = QKeySequence::NoMatch; // Free sequence keylock
+        clash++;
+#ifndef QT_NO_STATUSBAR
+        if (mainStatusBar &&
+             !lastitem->signal &&
+             !(lastaccel->parent->receivers(SIGNAL(activatedAmbiguously(int)))))
+            mainStatusBar->showMessage(message, 2000);
+#endif
+        lastaccel->activateAmbiguously(lastitem);
+    } else { // start (or wrap) with the first matching
+        intermediate = QKeySequence();
+        currentState = QKeySequence::NoMatch; // Free sequence keylock
+        clash = 0;
+#ifndef QT_NO_STATUSBAR
+        if (mainStatusBar &&
+             !firstitem->signal &&
+             !(firstaccel->parent->receivers(SIGNAL(activatedAmbiguously(int)))))
+            mainStatusBar->showMessage(message, 2000);
+#endif
+        firstaccel->activateAmbiguously(firstitem);
+    }
+    e->accept();
+    return true;
+}
+
+Q3AccelPrivate::Q3AccelPrivate(Q3Accel* p)
+    : parent(p)
+{
+    Q3AccelManager::self()->registerAccel(this);
+    aitems.setAutoDelete(true);
+    ignorewhatsthis = false;
+}
+
+Q3AccelPrivate::~Q3AccelPrivate()
+{
+    Q3AccelManager::self()->unregisterAccel(this);
+}
+
+static Q3AccelItem *find_id(Q3AccelList &list, int id)
+{
+    register Q3AccelItem *item = list.first();
+    while (item && item->id != id)
+        item = list.next();
+    return item;
+}
+
+static Q3AccelItem *find_key(Q3AccelList &list, const QKeySequence &key)
+{
+    register Q3AccelItem *item = list.first();
+    while (item && !(item->key == key))
+        item = list.next();
+    return item;
+}
+
+/*!
+    Constructs a Q3Accel object called \a name, with parent \a parent.
+    The accelerator operates on \a parent.
+*/
+
+Q3Accel::Q3Accel(QWidget *parent, const char *name)
+    : QObject(parent, name)
+{
+    d = new Q3AccelPrivate(this);
+    d->enabled = true;
+    d->watch = parent;
+#if defined(QT_CHECK_NULL)
+    if (!d->watch)
+        qWarning("Q3Accel: An accelerator must have a parent or a watch widget");
+#endif
+}
+
+/*!
+    Constructs a Q3Accel object called \a name, that operates on \a
+    watch, and is a child of \a parent.
+
+    This constructor is not needed for normal application programming.
+*/
+Q3Accel::Q3Accel(QWidget* watch, QObject *parent, const char *name)
+    : QObject(parent, name)
+{
+    d = new Q3AccelPrivate(this);
+    d->enabled = true;
+    d->watch = watch;
+#if defined(QT_CHECK_NULL)
+    if (!d->watch)
+        qWarning("Q3Accel: An accelerator must have a parent or a watch widget");
+#endif
+}
+
+/*!
+    Destroys the accelerator object and frees all allocated resources.
+*/
+
+Q3Accel::~Q3Accel()
+{
+    delete d;
+}
+
+
+/*!
+    \fn void Q3Accel::activated(int id)
+
+    This signal is emitted when the user types the shortcut's key
+    sequence. \a id is a number that identifies this particular
+    accelerator item.
+
+    \sa activatedAmbiguously()
+*/
+
+/*!
+    \fn void Q3Accel::activatedAmbiguously(int id)
+
+    This signal is emitted when the user types a shortcut key
+    sequence that is ambiguous. For example, if one key sequence is a
+    "prefix" for another and the user types these keys it isn't clear
+    if they want the shorter key sequence, or if they're about to
+    type more to complete the longer key sequence. \a id is a number
+    that identifies this particular accelerator item.
+
+    \sa activated()
+*/
+
+/*!
+    Returns true if the accelerator is enabled; otherwise returns
+    false.
+
+    \sa setEnabled(), isItemEnabled()
+*/
+
+bool Q3Accel::isEnabled() const
+{
+    return d->enabled;
+}
+
+
+/*!
+    Enables the accelerator if \a enable is true, or disables it if \a
+    enable is false.
+
+    Individual keys can also be enabled or disabled using
+    setItemEnabled(). To work, a key must be an enabled item in an
+    enabled Q3Accel.
+
+    \sa isEnabled(), setItemEnabled()
+*/
+
+void Q3Accel::setEnabled(bool enable)
+{
+    d->enabled = enable;
+}
+
+
+/*!
+    Returns the number of accelerator items in this accelerator.
+*/
+
+uint Q3Accel::count() const
+{
+    return d->aitems.count();
+}
+
+
+static int get_seq_id()
+{
+    static int seq_no = -2;  // -1 is used as return value in findKey()
+    return seq_no--;
+}
+
+/*!
+    Inserts an accelerator item and returns the item's identifier.
+
+    \a key is a key code and an optional combination of SHIFT, CTRL
+    and ALT. \a id is the accelerator item id.
+
+    If \a id is negative, then the item will be assigned a unique
+    negative identifier less than -1.
+
+    \snippet doc/src/snippets/code/src_qt3support_other_q3accel.cpp 3
+*/
+
+int Q3Accel::insertItem(const QKeySequence& key, int id)
+{
+    if (id == -1)
+        id = get_seq_id();
+    d->aitems.insert(0, new Q3AccelItem(key,id));
+    return id;
+}
+
+/*!
+    Removes the accelerator item with the identifier \a id.
+*/
+
+void Q3Accel::removeItem(int id)
+{
+    if (find_id(d->aitems, id))
+        d->aitems.remove();
+}
+
+
+/*!
+    Removes all accelerator items.
+*/
+
+void Q3Accel::clear()
+{
+    d->aitems.clear();
+}
+
+
+/*!
+    Returns the key sequence of the accelerator item with identifier
+    \a id, or an invalid key sequence (0) if the id cannot be found.
+*/
+
+QKeySequence Q3Accel::key(int id)
+{
+    Q3AccelItem *item = find_id(d->aitems, id);
+    return item ? item->key : QKeySequence(0);
+}
+
+
+/*!
+    Returns the identifier of the accelerator item with the key code
+    \a key, or -1 if the item cannot be found.
+*/
+
+int Q3Accel::findKey(const QKeySequence& key) const
+{
+    Q3AccelItem *item = find_key(d->aitems, key);
+    return item ? item->id : -1;
+}
+
+
+/*!
+    Returns true if the accelerator item with the identifier \a id is
+    enabled. Returns false if the item is disabled or cannot be found.
+
+    \sa setItemEnabled(), isEnabled()
+*/
+
+bool Q3Accel::isItemEnabled(int id) const
+{
+    Q3AccelItem *item = find_id(d->aitems, id);
+    return item ? item->enabled : false;
+}
+
+
+/*!
+    Enables the accelerator item with the identifier \a id if \a
+    enable is true, and disables item \a id if \a enable is false.
+
+    To work, an item must be enabled and be in an enabled Q3Accel.
+
+    \sa isItemEnabled(), isEnabled()
+*/
+
+void Q3Accel::setItemEnabled(int id, bool enable)
+{
+    Q3AccelItem *item = find_id(d->aitems, id);
+    if (item)
+        item->enabled = enable;
+}
+
+
+/*!
+    Connects the accelerator item \a id to the slot \a member of \a
+    receiver. Returns true if the connection is successful.
+
+    \snippet doc/src/snippets/code/src_qt3support_other_q3accel.cpp 4
+
+    Of course, you can also send a signal as \a member.
+
+    Normally accelerators are connected to slots which then receive
+    the \c activated(int id) signal with the id of the accelerator
+    item that was activated. If you choose to connect a specific
+    accelerator item using this function, the \c activated() signal is
+    emitted if the associated key sequence is pressed but no \c
+    activated(int id) signal is emitted.
+
+    \sa disconnectItem(), QObject::connect()
+*/
+
+bool Q3Accel::connectItem(int id, const QObject *receiver, const char *member)
+{
+    Q3AccelItem *item = find_id(d->aitems, id);
+    if (item) {
+        if (!item->signal) {
+            item->signal = new Q3Signal;
+            Q_CHECK_PTR(item->signal);
+        }
+        return item->signal->connect(receiver, member);
+    }
+    return false;
+}
+
+/*!
+    Disconnects the accelerator item identified by \a id from
+    the function called \a member in the \a receiver object.
+    Returns true if the connection existed and the disconnect
+    was successful.
+
+    \sa connectItem(), QObject::disconnect()
+*/
+
+bool Q3Accel::disconnectItem(int id, const QObject *receiver,
+                             const char *member)
+{
+    Q3AccelItem *item = find_id(d->aitems, id);
+    if (item && item->signal)
+        return item->signal->disconnect(receiver, member);
+    return false;
+}
+
+void Q3AccelPrivate::activate(Q3AccelItem* item)
+{
+#ifndef QT_NO_WHATSTHIS
+    if (QWhatsThis::inWhatsThisMode() && !ignorewhatsthis) {
+        QWhatsThis::showText(QCursor::pos(), item->whatsthis);
+        return;
+    }
+#endif
+    if (item->signal)
+        item->signal->activate();
+    else
+        emit parent->activated(item->id);
+}
+
+void Q3AccelPrivate::activateAmbiguously(Q3AccelItem* item)
+{
+    if (item->signal)
+        item->signal->activate();
+    else
+        emit parent->activatedAmbiguously(item->id);
+}
+
+
+/*!
+    Returns the shortcut key sequence for \a str, or an invalid key
+    sequence (0) if \a str has no shortcut sequence.
+
+    For example, shortcutKey("E&xit") returns QKeySequence(Qt::ALT +
+    Qt::Key_X), shortcutKey("&Quit") returns QKeySequence(Qt::ALT +
+    Qt::Key_Q), and shortcutKey("Quit") returns QKeySequence().
+*/
+
+QKeySequence Q3Accel::shortcutKey(const QString &str)
+{
+    if(qt_accel_no_shortcuts)
+        return QKeySequence();
+
+    int p = 0;
+    while (p >= 0) {
+        p = str.find(QLatin1Char('&'), p) + 1;
+        if (p <= 0 || p >= (int)str.length())
+            return 0;
+        if (str[p] != QLatin1Char('&')) {
+            QChar c = str[p];
+            if (c.isPrint()) {
+                char ltr = c.upper().latin1();
+                if (ltr >= (char)Key_A && ltr <= (char)Key_Z)
+                    c = QLatin1Char(ltr);
+                else
+                    c = c.lower();
+                return QKeySequence(c.unicode() + ALT + UNICODE_ACCEL);
+            }
+        }
+        p++;
+    }
+    return QKeySequence();
+}
+
+/*! \obsolete
+
+   Creates an accelerator string for the key \a k.
+   For instance CTRL+Key_O gives "Ctrl+O". The "Ctrl" etc.
+   are translated (using QObject::tr()) in the "Q3Accel" context.
+
+   The function is superfluous. Cast the QKeySequence \a k to a
+   QString for the same effect.
+*/
+QString Q3Accel::keyToString(QKeySequence k)
+{
+    return (QString) k;
+}
+
+/*!\obsolete
+
+  Returns an accelerator code for the string \a s. For example
+  "Ctrl+O" gives CTRL+UNICODE_ACCEL+'O'. The strings "Ctrl",
+  "Shift", "Alt" are recognized, as well as their translated
+  equivalents in the "Q3Accel" context (using QObject::tr()). Returns 0
+  if \a s is not recognized.
+
+  This function is typically used with \link QObject::tr() tr
+  \endlink(), so that accelerator keys can be replaced in
+  translations:
+
+  \snippet doc/src/snippets/code/src_qt3support_other_q3accel.cpp 5
+
+  Notice the "File|Open" translator comment. It is by no means
+  necessary, but it provides some context for the human translator.
+
+  The function is superfluous. Construct a QKeySequence from the
+  string \a s for the same effect.
+
+  \sa QObject::tr(), {Internationalization with Qt}
+*/
+QKeySequence Q3Accel::stringToKey(const QString & s)
+{
+    return QKeySequence(s);
+}
+
+
+/*!
+    Sets a What's This help text for the accelerator item \a id to \a
+    text.
+
+    The text will be shown when the application is in What's This mode
+    and the user hits the accelerator key.
+
+    To set What's This help on a menu item (with or without an
+    accelerator key), use Q3MenuData::setWhatsThis().
+
+    \sa whatsThis(), QWhatsThis::inWhatsThisMode(), QAction::setWhatsThis()
+*/
+void Q3Accel::setWhatsThis(int id, const QString& text)
+{
+    Q3AccelItem *item = find_id(d->aitems, id);
+    if (item)
+        item->whatsthis = text;
+}
+
+/*!
+    Returns the What's This help text for the specified item \a id or
+    an empty string if no text has been specified.
+
+    \sa setWhatsThis()
+*/
+QString Q3Accel::whatsThis(int id) const
+{
+
+    Q3AccelItem *item = find_id(d->aitems, id);
+    return item? item->whatsthis : QString();
+}
+
+/*!\internal */
+void Q3Accel::setIgnoreWhatsThis(bool b)
+{
+    d->ignorewhatsthis = b;
+}
+
+/*!\internal */
+bool Q3Accel::ignoreWhatsThis() const
+{
+    return d->ignorewhatsthis;
+}
+
+/*!
+    \fn void Q3Accel::repairEventFilter()
+    \internal
+*/
+
+QT_END_NAMESPACE