source: trunk/src/gui/kernel/qevent.cpp@ 748

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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.

    There are a few similarities between the events QEvent::HoverEnter
    and QEvent::HoverLeave, and the events QEvent::Enter and QEvent::Leave.
    However, they are slightly different because we do an update() in the event
    handler of HoverEnter and HoverLeave.

    QEvent::HoverMove is also slightly different from QEvent::MouseMove. Let us
    consider a top-level window A containing a child B which in turn contains a
    child C (all with mouse tracking enabled):

    \image hoverevents.png

    Now, if you move the cursor from the top to the bottom in the middle of A,
    you will get the following QEvent::MouseMove events:

    \list 1
        \o A::MouseMove
        \o B::MouseMove
        \o C::MouseMove
    \endlist

    You will get the same events for QEvent::HoverMove, except that the event
    always propagates to the top-level regardless whether the event is accepted
    or not. It will only stop propagating with the Qt::WA_NoMousePropagation
    attribute.

    In this case the events will occur in the following way:

    \list 1
        \o A::HoverMove
        \o A::HoverMove, B::HoverMove
        \o A::HoverMove, B::HoverMove, C::HoverMove
    \endlist

*/

/*!
    \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().