C++ QWidget::focusProxy方法代码示例

QWidget* kMyMoneyEdit::focusWidget() const
{
  QWidget* w = m_edit;
  while (w->focusProxy())
    w = w->focusProxy();
  return w;
}

/******************************************************************************
* Set a buddy widget.
* If it (or its focus proxy) is a radio button, create a focus widget.
* When the accelerator key is pressed, the focus widget then receives focus.
* That event triggers the selection of the radio button.
*/
void Label::setBuddy(QWidget *bud)
{
    if(mRadioButton)
        disconnect(mRadioButton, SIGNAL(destroyed()), this, SLOT(buddyDead()));
    QWidget *w = bud;
    if(w)
    {
        while(w->focusProxy())
            w = w->focusProxy();
        if(!w->inherits("QRadioButton"))
            w = 0;
    }
    if(!w)
    {
        // The buddy widget isn't a radio button
        QLabel::setBuddy(bud);
        delete mFocusWidget;
        mFocusWidget = 0;
        mRadioButton = 0;
    }
    else
    {
        // The buddy widget is a radio button, so set a different buddy
        if(!mFocusWidget)
            mFocusWidget = new LabelFocusWidget(this);
        QLabel::setBuddy(mFocusWidget);
        mRadioButton = (QRadioButton *)bud;
        connect(mRadioButton, SIGNAL(destroyed()), this, SLOT(buddyDead()));
    }
}

QWidget *QWidgetProto::focusProxy() const
{
  QWidget *item = qscriptvalue_cast<QWidget*>(thisObject());
  if (item)
    return item->focusProxy();
  return 0;
}

static void qwtSetTabOrder( 
    QWidget *first, QWidget *second, bool withChildren )
{
    QList<QWidget *> tabChain;
    tabChain += first;
    tabChain += second;

    if ( withChildren )
    {
        QList<QWidget *> children = second->findChildren<QWidget *>();

        QWidget *w = second->nextInFocusChain();
        while ( children.contains( w ) )
        {
            children.removeAll( w );

            tabChain += w;
            w = w->nextInFocusChain();
        }
    }

    for ( int i = 0; i < tabChain.size() - 1; i++ )
    {
        QWidget *from = tabChain[i];
        QWidget *to = tabChain[i+1];

        const Qt::FocusPolicy policy1 = from->focusPolicy();
        const Qt::FocusPolicy policy2 = to->focusPolicy();

        QWidget *proxy1 = from->focusProxy();
        QWidget *proxy2 = to->focusProxy();

        from->setFocusPolicy( Qt::TabFocus );
        from->setFocusProxy( NULL);

        to->setFocusPolicy( Qt::TabFocus );
        to->setFocusProxy( NULL);

        QWidget::setTabOrder( from, to );

        from->setFocusPolicy( policy1 );
        from->setFocusProxy( proxy1);

        to->setFocusPolicy( policy2 );
        to->setFocusProxy( proxy2 );
    }
}

/*!
    \property QStackedLayout::currentIndex
    \brief the index position of the widget that is visible

    The current index is -1 if there is no current widget.

    \sa currentWidget(), indexOf()
*/
void QStackedLayout::setCurrentIndex(int index)
{
    Q_D(QStackedLayout);
    QWidget *prev = currentWidget();
    QWidget *next = widget(index);
    if (!next || next == prev)
        return;

    bool reenableUpdates = false;
    QWidget *parent = parentWidget();

    if (parent && parent->updatesEnabled()) {
        reenableUpdates = true;
        parent->setUpdatesEnabled(false);
    }

    QWidget *fw = parent ? parent->window()->focusWidget() : 0;
    if (prev) {
        prev->clearFocus();
        if (d->stackingMode == StackOne)
            prev->hide();
    }

    d->index = index;
    next->raise();
    next->show();

    // try to move focus onto the incoming widget if focus
    // was somewhere on the outgoing widget.

    if (parent) {
        if (fw && (prev && prev->isAncestorOf(fw))) { // focus was on old page
            // look for the best focus widget we can find
            if (QWidget *nfw = next->focusWidget())
                nfw->setFocus();
            else {
                // second best: first child widget in the focus chain
                QWidget *i = fw;
                while ((i = i->nextInFocusChain()) != fw) {
                    if (((i->focusPolicy() & Qt::TabFocus) == Qt::TabFocus)
                        && !i->focusProxy() && i->isVisibleTo(next) && i->isEnabled()
                        && next->isAncestorOf(i)) {
                        i->setFocus();
                        break;
                    }
                }
                // third best: incoming widget
                if (i == fw )
                    next->setFocus();
            }
        }
    }
    if (reenableUpdates)
        parent->setUpdatesEnabled(true);
    emit currentChanged(index);
}

void Q3WidgetStack::raiseWidget(QWidget *w)
{
    if (!w || w == invisible || w->parent() != this || w == topWidget)
        return;

    if (id(w) == -1)
        addWidget(w);
    if (!isVisible()) {
        topWidget = w;
        return;
    }

    if (w->maximumSize().width() < invisible->width()
            || w->maximumSize().height() < invisible->height())
        invisible->setBackgroundMode(backgroundMode());
    else if (invisible->backgroundMode() != NoBackground)
        invisible->setBackgroundMode(NoBackground);

    if (invisible->isHidden()) {
        invisible->setGeometry(contentsRect());
        invisible->lower();
        invisible->show();
        QApplication::sendPostedEvents(invisible, QEvent::ShowWindowRequest);
    }

    // try to move focus onto the incoming widget if focus
    // was somewhere on the outgoing widget.
    if (topWidget) {
        QWidget * fw = window()->focusWidget();
        if (topWidget->isAncestorOf(fw)) { // focus was on old page
            // look for the best focus widget we can find
            QWidget *p = w->focusWidget();
            if (!p) {
                // second best == first child widget in the focus chain
                QWidget *i = fw;
                while ((i = i->nextInFocusChain()) != fw) {
                    if (((i->focusPolicy() & Qt::TabFocus) == Qt::TabFocus)
                            && !i->focusProxy() && i->isVisibleTo(w) && i->isEnabled()
                            && w->isAncestorOf(i)) {
                        p = i;
                        break;
                    }
                }
            }
            if (p)
                p->setFocus();
        } else {
            // the focus wasn't on the old page, so we have to ensure focus doesn't go to
            // the widget in the page that last had focus when we show the page again.
            QWidget *oldfw = topWidget->focusWidget();
            if (oldfw)
                oldfw->clearFocus();
        }
    }

    if (isVisible()) {
        emit aboutToShow(w);
        int i = id(w);
        if (i != -1)
            emit aboutToShow(i);
    }

    topWidget = w;

    QObjectList c = children();
    for (int i = 0; i < c.size(); ++i) {
        QObject * o = c.at(i);
        if (o->isWidgetType() && o != w && o != invisible)
            static_cast<QWidget *>(o)->hide();
    }

    w->setGeometry(invisible->geometry());
    w->show();
}

void QWidgetStack::raiseWidget( QWidget *w )
{
    if ( !w || w == invisible || w->parent() != this || w == topWidget )
	return;

    if ( id(w) == -1 )
	addWidget( w );
    if ( !isVisible() ) {
	topWidget = w;
	return;
    }

    if (w->maximumSize().width() < invisible->width()
        || w->maximumSize().height() < invisible->height())
        invisible->setBackgroundMode(backgroundMode());
    else if (invisible->backgroundMode() != NoBackground)
        invisible->setBackgroundMode(NoBackground);

    if ( invisible->isHidden() ) {
	invisible->setGeometry( contentsRect() );
	invisible->lower();
	invisible->show();
	QApplication::sendPostedEvents( invisible, QEvent::ShowWindowRequest );
    }

    // try to move focus onto the incoming widget if focus
    // was somewhere on the outgoing widget.
    if ( topWidget ) {
	QWidget * fw = focusWidget();
	QWidget* p = fw;
	while ( p && p != topWidget )
	    p = p->parentWidget();
	if ( p == topWidget ) { // focus was on old page
	    if ( !focusWidgets )
		focusWidgets = new QPtrDict<QWidget>( 17 );
	    focusWidgets->replace( topWidget, fw );
	    fw->clearFocus();
	    // look for the best focus widget we can find
	    // best == what we had (which may be deleted)
	    fw = focusWidgets->take( w );
	    if ( isChildOf( fw, w ) ) {
		fw->setFocus();
	    } else {
		// second best == first child widget in the focus chain
		QFocusData *f = focusData();
		QWidget* home = f->home();
		QWidget *i = home;
		do {
		    if ( ( ( i->focusPolicy() & TabFocus ) == TabFocus )
			 && !i->focusProxy() && i->isVisibleTo(w) && i->isEnabled() ) {
			p = i;
			while ( p && p != w )
			    p = p->parentWidget();
			if ( p == w ) {
			    i->setFocus();
			    break;
			}
		    }
		    i = f->next();
		} while( i != home );
	    }
	}
    }

    if ( isVisible() ) {
	emit aboutToShow( w );
	int i = id( w );
	if ( i != -1 )
	    emit aboutToShow( i );
    }

    topWidget = w;

    const QObjectList * c = children();
    QObjectListIt it( *c );
    QObject * o;

    while( (o=it.current()) != 0 ) {
	++it;
	if ( o->isWidgetType() && o != w && o != invisible )
	    ((QWidget *)o)->hide();
    }

    w->setGeometry( invisible->geometry() );
    w->show();
}