qwidget.cpp

奇趣公司比较新的qt/emd版本

  \i Qt::WA_WState_CompressKeys Compress keyboard events.
  \i Qt::WA_WState_BlockUpdates Repaints and updates are disabled.
  \i Qt::WA_WState_InPaintEvent Currently processing a paint event.
  \i Qt::WA_WState_Reparented The widget has been reparented.
  \i Qt::WA_WState_ConfigPending A configuration (resize/move) event is pending.
  \i Qt::WA_WState_DND (Deprecated) The widget supports drag and drop, see setAcceptDrops().
  \endlist
*/

/*!
    Constructs a widget which is a child of \a parent, with  widget
    flags set to \a f.

    If \a parent is 0, the new widget becomes a window. If
    \a parent is another widget, this widget becomes a child window
    inside \a parent. The new widget is deleted when its \a parent is
    deleted.

    The widget flags argument, \a f, is normally 0, but it can be set
    to customize the frame of a window (i.e. \a
    parent must be 0). To customize the frame, use a value composed
    from the bitwise OR of any of the \l{Qt::WindowFlags}{window flags}.

    If you add a child widget to an already visible widget you must
    explicitly show the child to make it visible.

    Note that the X11 version of Qt may not be able to deliver all
    combinations of style flags on all systems. This is because on
    X11, Qt can only ask the window manager, and the window manager
    can override the application's settings. On Windows, Qt can set
    whatever flags you want.

    \sa windowFlags
*/

QWidget::QWidget(QWidget *parent, Qt::WindowFlags f)
    : QObject(*new QWidgetPrivate, 0), QPaintDevice()
{
    d_func()->init(parent, f);
}

#ifdef QT3_SUPPORT
/*!
    \overload
    \obsolete
 */
QWidget::QWidget(QWidget *parent, const char *name, Qt::WindowFlags f)
    : QObject(*new QWidgetPrivate, 0), QPaintDevice()
{
    d_func()->init(parent , f);
    setObjectName(QString::fromAscii(name));
}
#endif

/*! \internal
*/
QWidget::QWidget(QWidgetPrivate &dd, QWidget* parent, Qt::WindowFlags f)
    : QObject(dd, 0), QPaintDevice()
{
    d_func()->init(parent, f);
}

/*!
    \internal
*/
int QWidget::devType() const
{
    return QInternal::Widget;
}


//### w is a "this" ptr, passed as a param because QWorkspace needs special logic
void QWidgetPrivate::adjustFlags(Qt::WindowFlags &flags, QWidget *w)
{
    bool customize =  (flags & (Qt::CustomizeWindowHint
            | Qt::FramelessWindowHint
            | Qt::WindowTitleHint
            | Qt::WindowSystemMenuHint
            | Qt::WindowMinimizeButtonHint
            | Qt::WindowMaximizeButtonHint
            | Qt::WindowContextHelpButtonHint));

    uint type = (flags & Qt::WindowType_Mask);

    if ((type == Qt::Widget || type == Qt::SubWindow) && w && !w->parent()) {
        type = Qt::Window;
        flags |= Qt::Window;
    }

    if (customize)
        ;
    else if (type == Qt::Dialog || type == Qt::Sheet)
        flags |= Qt::WindowTitleHint | Qt::WindowSystemMenuHint | Qt::WindowContextHelpButtonHint;
    else if (type == Qt::Tool)
        flags |= Qt::WindowTitleHint | Qt::WindowSystemMenuHint;
    else
        flags |= Qt::WindowTitleHint | Qt::WindowSystemMenuHint | Qt::WindowMinimizeButtonHint | Qt::WindowMaximizeButtonHint;


}

void QWidgetPrivate::init(QWidget *parentWidget, Qt::WindowFlags f)
{
    Q_Q(QWidget);
    if (qApp->type() == QApplication::Tty)
        qFatal("QWidget: Cannot create a QWidget when no GUI is being used");

    Q_ASSERT(uncreatedWidgets);
    uncreatedWidgets->insert(q);

    QWidget *desktopWidget = 0;
    if (parentWidget && parentWidget->windowType() == Qt::Desktop) {
        desktopWidget = parentWidget;
        parentWidget = 0;
    }

    q->data = &data;

#ifndef QT_NO_THREAD
    if (!q->parent()) {
        Q_ASSERT_X(q->thread() == qApp->thread(), "QWidget",
                   "Widgets must be created in the GUI thread.");
    }
#endif

#if defined(Q_WS_X11)
    if (desktopWidget) {
        // make sure the widget is created on the same screen as the
        // programmer specified desktop widget
        xinfo = desktopWidget->d_func()->xinfo;
    }
#else
    Q_UNUSED(desktopWidget);
#endif

    data.fstrut_dirty = true;

    data.winid = 0;
    data.widget_attributes = 0;
    data.window_flags = f;
    data.window_state = 0;
    data.focus_policy = 0;
    data.context_menu_policy = Qt::DefaultContextMenu;
    data.window_modality = Qt::NonModal;

    data.sizehint_forced = 0;
    data.is_closing = 0;
    data.in_show = 0;
    data.in_set_window_state = 0;
    data.in_destructor = false;

    q->setAttribute(Qt::WA_QuitOnClose); // might be cleared in create()

    q->setAttribute(Qt::WA_WState_Hidden);

    //give potential windows a bigger "pre-initial" size; create_sys() will give them a new size later
    data.crect = parentWidget ? QRect(0,0,100,30) : QRect(0,0,640,480);

    focus_next = focus_prev = q;

    if ((f & Qt::WindowType_Mask) == Qt::Desktop)
        q->create();
    else if (parentWidget)
        q->setParent(parentWidget, data.window_flags);
    else {
        adjustFlags(data.window_flags, q);
        resolveLayoutDirection();
    }
#if defined(Q_WS_X11)
    data.fnt.x11SetScreen(xinfo.screen());
#endif // Q_WS_X11

    q->setAttribute(Qt::WA_PendingMoveEvent);
    q->setAttribute(Qt::WA_PendingResizeEvent);

    if (++QWidgetPrivate::instanceCounter > QWidgetPrivate::maxInstances)
        QWidgetPrivate::maxInstances = QWidgetPrivate::instanceCounter;

    if (QApplicationPrivate::app_compile_version < 0x040200
        || QApplicationPrivate::testAttribute(Qt::AA_ImmediateWidgetCreation))
        q->create();


    QEvent e(QEvent::Create);
    QApplication::sendEvent(q, &e);
    QApplication::postEvent(q, new QEvent(QEvent::PolishRequest));

    extraPaintEngine = 0;
}



void QWidgetPrivate::createRecursively()
{
    Q_Q(QWidget);
    q->create(0, true, true);
    for (int i = 0; i < children.size(); ++i) {
        QWidget *child = qobject_cast<QWidget *>(children.at(i));
        if (child && !child->isHidden() && !child->isWindow() && !child->testAttribute(Qt::WA_WState_Created))
            child->d_func()->createRecursively();
    }
}




/*!
    Creates a new widget window if \a window is 0, otherwise sets the
    widget's window to \a window.

    Initializes the window (sets the geometry etc.) if \a
    initializeWindow is true. If \a initializeWindow is false, no
    initialization is performed. This parameter only makes sense if \a
    window is a valid window.

    Destroys the old window if \a destroyOldWindow is true. If \a
    destroyOldWindow is false, you are responsible for destroying the
    window yourself (using platform native code).

    The QWidget constructor calls create(0,true,true) to create a
    window for this widget.
*/

void QWidget::create(WId window, bool initializeWindow, bool destroyOldWindow)
{
    Q_D(QWidget);
    if (testAttribute(Qt::WA_WState_Created) && window == 0)
        return;

    if (d->data.in_destructor)
        return;

    Qt::WindowType type = windowType();
    Qt::WindowFlags &flags = data->window_flags;

    if ((type == Qt::Widget || type == Qt::SubWindow) && !parentWidget()) {
        type = Qt::Window;
        flags |= Qt::Window;
    }

    if (parentWidget() && (type & Qt::Window) && !parentWidget()->testAttribute(Qt::WA_WState_Created))
        parentWidget()->createWinId();

#ifdef QT3_SUPPORT
    if (flags & Qt::WStaticContents)
        setAttribute(Qt::WA_StaticContents);
    if (flags & Qt::WDestructiveClose)
        setAttribute(Qt::WA_DeleteOnClose);
    if (flags & Qt::WShowModal)
        setWindowModality(Qt::ApplicationModal);
    if (flags & Qt::WMouseNoMask)
        setAttribute(Qt::WA_MouseNoMask);
    if (flags & Qt::WGroupLeader)
        setAttribute(Qt::WA_GroupLeader);
    if (flags & Qt::WNoMousePropagation)
        setAttribute(Qt::WA_NoMousePropagation);
#endif

    if ( type != Qt::Widget && type != Qt::Window && type != Qt::Dialog)
        setAttribute(Qt::WA_QuitOnClose, false);

    setAttribute(Qt::WA_WState_Created);                        // set created flag
    d->create_sys(window, initializeWindow, destroyOldWindow);

    // a real toplevel window needs a backing store
#ifndef Q_WS_MAC
    if (isWindow()) {
        delete d->topData()->backingStore;
        // QWidgetBackingStore will check this variable, hence it must be 0
        d->topData()->backingStore = 0;
        d->topData()->backingStore = new QWidgetBackingStore(this);
    }
#endif

    d->setModal_sys();

    if (!isWindow() && parentWidget() && parentWidget()->testAttribute(Qt::WA_DropSiteRegistered))
        setAttribute(Qt::WA_DropSiteRegistered, true);

#ifdef QT_EVAL
    extern void qt_eval_init_widget(QWidget *w);
    qt_eval_init_widget(this);
#endif

    // need to force the resting of the icon after changing parents
    if (testAttribute(Qt::WA_SetWindowIcon))
        d->setWindowIcon_sys(true);
    if (isWindow() && !d->topData()->iconText.isEmpty())
        d->setWindowIconText_helper(d->topData()->iconText);
    if (windowType() != Qt::Desktop) {
        d->updateSystemBackground();

        if (isWindow() && !testAttribute(Qt::WA_SetWindowIcon))
            d->setWindowIcon_sys();
    }
}

/*!
    Destroys the widget.

    All this widget's children are deleted first. The application
    exits if this widget is the main widget.
*/

QWidget::~QWidget()
{
    Q_D(QWidget);
    d->data.in_destructor = true;

#if defined (QT_CHECK_STATE)
    if (paintingActive())
        qWarning("QWidget: %s (%s) deleted while being painted", className(), name());
#endif

    // force acceptDrops false before winId is destroyed.
    d->registerDropSite(false);

#ifndef QT_NO_ACTION
    // remove all actions from this widget
    for (int i = 0; i < d->actions.size(); ++i) {
        QActionPrivate *apriv = d->actions.at(i)->d_func();
        apriv->widgets.removeAll(this);
    }
    d->actions.clear();
#endif

#ifndef QT_NO_SHORTCUT
    // Remove all shortcuts grabbed by this
    // widget, unless application is closing
    if (!QApplicationPrivate::is_app_closing && testAttribute(Qt::WA_GrabbedShortcut))
        qApp->d_func()->shortcutMap.removeShortcut(0, this, QKeySequence());
#endif

    // delete layout while we still are a valid widget
    delete d->layout;
    // Remove myself from focus list

    Q_ASSERT(d->focus_next->d_func()->focus_prev == this);
    Q_ASSERT(d->focus_prev->d_func()->focus_next == this);

    if (d->focus_next != this) {
        d->focus_next->d_func()->focus_prev = d->focus_prev;
        d->focus_prev->d_func()->focus_next = d->focus_next;
        d->focus_next = d->focus_prev = 0;
    }

#ifdef QT3_SUPPORT
    if (QApplicationPrivate::main_widget == this) {        // reset main widget
        QApplicationPrivate::main_widget = 0;
        qApp->quit();
    }
#endif

    clearFocus();

#ifdef Q_WIDGET_CACHE_OPAQUEREGIONS
     d->setDirtyOpaqueRegion();
#endif

    if (isWindow() && isVisible() && internalWinId())
        hide();

    // set all QPointers for this object to zero
    QObjectPrivate::clearGuards(this);

    if (!d->children.isEmpty())
        d->deleteChildren();

    QApplication::removePostedEvents(this);

    destroy();                                        // platform-dependent cleanup

    --QWidgetPrivate::instanceCounter;

    if (QWidgetPrivate::uncreatedWidgets) // might have been deleted by ~QApplication
        QWidgetPrivate::uncreatedWidgets->remove(this);

    QEvent e(QEvent::Destroy);
    QCoreApplication::sendEvent(this, &e);
}

int QWidgetPrivate::instanceCounter = 0;  // Current number of widget instances
int QWidgetPrivate::maxInstances = 0;     // Maximum number of widget instances

void QWidgetPrivate::setWinId(WId id)                // set widget identifier
{
    Q_Q(QWidget);
    if (mapper && data.winid) {
        mapper->remove(data.winid);
        uncreatedWidgets->insert(q);
    }

    data.winid = id;
#if defined(Q_WS_X11)
    hd = id; // X11: hd == ident
#endif
    if (mapper && id) {
        mapper->insert(data.winid, q);
        uncreatedWidgets->remove(q);
    }
}

void QWidgetPrivate::createTLExtra()
{
    if (!extra)
        createExtra();
    if (!extra->topextra) {
        QTLWExtra* x = extra->topextra = new QTLWExtra;
        x->windowSurface = 0;
        x->opacity = 255;
        x->posFromMove = false;
        x->icon = 0;
        x->iconPixmap = 0;
        x->frameStrut.setCoords(0, 0, 0, 0);
        x->incw = x->inch = 0;