C++ QWidget::focusWidget方法代码示例

void GuiMainWindow::currentChanged(int index)
{
    if (index < 0)
        return;
    if (index < (signed)widgetAtIndex.size()) {
        auto it = widgetAtIndex[index];
        if (it.first) {
            if (it.first->focusWidget())
                it.first->focusWidget()->setFocus();
        } else if (it.second)
            it.second->setFocus();
        return;
    }

    // slow_mode: if tab is inserted just now, widgetAtIndex may not
    // be up-to-date.
    if (tabArea->widget(index)) {
        QWidget *currWgt = tabArea->widget(index);
        if (qobject_cast<GuiSplitter*>(currWgt)) {
            if (currWgt->focusWidget())
                currWgt->focusWidget()->setFocus();
        } else if (qobject_cast<GuiTerminalWindow*>(currWgt))
            currWgt->setFocus();
    }
}

void QApplicationPrivate::processKeyEvent(QWindowSystemInterfacePrivate::KeyEvent *e)
{
    QWidget *focusW = 0;
    if (self->inPopupMode()) {
        QWidget *popupW = qApp->activePopupWidget();
        focusW = popupW->focusWidget() ? popupW->focusWidget() : popupW;
    }
    if (!focusW)
        focusW = QApplication::focusWidget();
    if (!focusW) {
        focusW = e->widget.data();
    }
    if (!focusW)
        focusW = QApplication::activeWindow();

    //qDebug() << "handleKeyEvent" << hex << e->key() << e->modifiers() << e->text() << "widget" << focusW;

    if (!focusW)
        return;
    if (app_do_modal && !qt_try_modal(focusW, e->keyType))
        return;

    if (e->nativeScanCode || e->nativeVirtualKey || e->nativeModifiers) {
        QKeyEventEx ev(e->keyType, e->key, e->modifiers, e->unicode, e->repeat, e->repeatCount,
                       e->nativeScanCode, e->nativeVirtualKey, e->nativeModifiers);
        QApplication::sendSpontaneousEvent(focusW, &ev);
    } else {
        QKeyEvent ev(e->keyType, e->key, e->modifiers, e->unicode, e->repeat, e->repeatCount);
        QApplication::sendSpontaneousEvent(focusW, &ev);
    }
}

void PrefsDialog::changedTabPanel(int index)
{
	// this all feels a bit hacky, but seems to keep things tidy on Mac OS X at least
	QWidget *page = tabWidget->widget(index);
	page->clearFocus();
	switch (index) {
		case 0: // General
			if (page->focusWidget() != NULL)
				page->focusWidget()->clearFocus();
			break;
		case 1: // Editor
			editorFont->setFocus();
			editorFont->lineEdit()->selectAll();
			break;
		case 2: // Preview
			scale->setFocus();
			scale->selectAll();
			break;
		case 3: // Typesetting
			binPathList->setFocus();
			break;
		case 4: // Script
			if (page->focusWidget() != NULL)
				page->focusWidget()->clearFocus();
			break;
	}
}

void GuiMainWindow::currentChanged(int index)
{
    if (index!=-1 && tabArea->widget(index)) {
        QWidget *currWgt = tabArea->widget(index);
        if (dynamic_cast<GuiSplitter*>(currWgt)) {
            if (currWgt->focusWidget())
                currWgt->focusWidget()->setFocus();
        } else if (dynamic_cast<GuiTerminalWindow*>(currWgt))
            currWgt->setFocus();
    }
}

    void testMoveTab()
    {
        // Test inspired by #170470 and #177036 (title messup).
        // Then expanded to include the problem of #159295 (focus loss).
        QWidget topLevel;
        QComboBox* combo = new QComboBox(&topLevel);
        combo->setEditable(true);
        KTabWidget* w = new KTabWidget(&topLevel);
        w->setAutomaticResizeTabs(true);
        w->resize(300, 400);
        QResizeEvent e(w->size(), QSize());
        QApplication::sendEvent(w, &e);
        QString prefix = "This is a long prefix for the tab title. ";
        KLineEdit* lineEdits[4];
        for (int i = 0; i < 4; ++i) {
            QWidget* page = new QWidget;
            page->setObjectName(QString::number(i));
            lineEdits[i] = new KLineEdit(page); // a widget that can take focus
            lineEdits[i]->setObjectName("LineEdit"+QString::number(i));
            w->insertTab(i, page, prefix+QString::number(i));
            //kDebug() << i << w->tabText(i);
        }
        topLevel.show();
        // Necessary after show(), otherwise topLevel.focusWidget() returns NULL
        QApplication::setActiveWindow(&topLevel);

        // Make sure the tab order is so that the combo gets focus after this tab
        QWidget::setTabOrder(lineEdits[0], combo->lineEdit());
        QWidget::setTabOrder(combo->lineEdit(), lineEdits[1]);

        w->setCurrentIndex(0);
        lineEdits[0]->setFocus();
        QCOMPARE(topLevel.focusWidget()->objectName(), lineEdits[0]->objectName());
        QVERIFY(lineEdits[0]->isVisible());

        w->moveTab(0,3);
        //for (int i = 0; i < 4; ++i)
            //kDebug() << i << w->tabText(i);
        QCOMPARE(w->tabText(0), QString(prefix+QString::number(1)));
        QCOMPARE(w->tabText(1), QString(prefix+QString::number(2)));
        QCOMPARE(w->tabText(2), QString(prefix+QString::number(3)));
        QCOMPARE(w->tabText(3), QString(prefix+QString::number(0)));

        // Did the focus switch to the lineEdit, due to removeTab+insertTab? Whoops.
        QCOMPARE(topLevel.focusWidget()->objectName(), lineEdits[0]->objectName());

        w->moveTab(3,0);
        QCOMPARE(topLevel.focusWidget()->objectName(), lineEdits[0]->objectName());
        for (int i = 0; i < 4; ++i) {
            //kDebug() << i << w->tabText(i);
            QCOMPARE(w->tabText(i), QString(prefix+QString::number(i)));
        }
     }

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

SearchBar::SearchBar(QWidget *parent)
    :QWidget(parent)
{

    // Get the widget that currently has the focus so we can properly
    // restore it when the filter bar is closed.
    QWidget* widgetWindow = (parent ? parent->window() : 0);
    m_focusWidget = (widgetWindow ? widgetWindow->focusWidget() : 0);

    // Initialize the user interface...
    m_ui.setupUi(this);
    m_ui.optionsButton->addAction(m_ui.actionMatchCase);
    m_ui.optionsButton->addAction(m_ui.actionHighlightMatch);
    m_ui.optionsButton->addAction(m_ui.actionSearchAutomatically);
    m_ui.closeButton->setIcon(KIcon("dialog-close"));
    m_ui.previousButton->setIcon(KIcon("go-up-search"));
    m_ui.nextButton->setIcon(KIcon("go-down-search"));
    m_ui.previousButton->setToolButtonStyle(Qt::ToolButtonTextBesideIcon);
    m_ui.nextButton->setToolButtonStyle(Qt::ToolButtonTextBesideIcon);
    m_ui.searchInfo->setText(i18nc("label for input line to find text", "&Find:"));

    setFocusProxy(m_ui.searchComboBox);
    
    connect(m_ui.nextButton, SIGNAL(clicked()),
            this, SLOT(findNext()));
    connect(m_ui.previousButton, SIGNAL(clicked()),
            this, SLOT(findPrevious()));
    connect(m_ui.searchComboBox, SIGNAL(returnPressed()),
            this, SLOT(findNext()));
    connect(m_ui.searchComboBox, SIGNAL(editTextChanged(QString)),
            this, SLOT(textChanged(QString)));

    // Start off hidden by default...
    setVisible(false);
}

/*!
    \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);
    }

    QPointer<QWidget> fw = parent ? parent->window()->focusWidget() : 0;
    const bool focusWasOnOldPage = fw && (prev && prev->isAncestorOf(fw));

    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 (focusWasOnOldPage) {
            // 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
                if (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 QApplicationPrivate::closePopup(QWidget *popup)
{
    if (!popupWidgets)
        return;
    popupWidgets->removeAll(popup);

     if (popup == qt_popup_down) {
         qt_button_down = 0;
         qt_popup_down = 0;
     }

    if (QApplicationPrivate::popupWidgets->count() == 0) { // this was the last popup
        delete QApplicationPrivate::popupWidgets;
        QApplicationPrivate::popupWidgets = 0;

        if (popupGrabOk) {
            popupGrabOk = false;

            if (popup->geometry().contains(QPoint(QGuiApplicationPrivate::mousePressX,
                                                  QGuiApplicationPrivate::mousePressY))
                || popup->testAttribute(Qt::WA_NoMouseReplay)) {
                // mouse release event or inside
                qt_replay_popup_mouse_event = false;
            } else { // mouse press event
                QGuiApplicationPrivate::mousePressTime -= 10000; // avoid double click
                qt_replay_popup_mouse_event = true;
            }

            // transfer grab back to mouse grabber if any, otherwise release the grab
            ungrabMouseForPopup(popup);

            // transfer grab back to keyboard grabber if any, otherwise release the grab
            ungrabKeyboardForPopup(popup);
        }

        if (active_window) {
            if (QWidget *fw = active_window->focusWidget()) {
                if (fw != QApplication::focusWidget()) {
                    fw->setFocus(Qt::PopupFocusReason);
                } else {
                    QFocusEvent e(QEvent::FocusIn, Qt::PopupFocusReason);
                    QCoreApplication::sendEvent(fw, &e);
                }
            }
        }

    } else {
        // A popup was closed, so the previous popup gets the focus.
        QWidget* aw = QApplicationPrivate::popupWidgets->last();
        if (QWidget *fw = aw->focusWidget())
            fw->setFocus(Qt::PopupFocusReason);

        if (QApplicationPrivate::popupWidgets->count() == 1) // grab mouse/keyboard
            grabForPopup(aw);
    }

}

GuiTerminalWindow * GuiMainWindow::getCurrentTerminal()
{
    GuiTerminalWindow *termWindow;
    QWidget *widget = tabArea->currentWidget();
    if (!widget)
        return NULL;
    termWindow = dynamic_cast<GuiTerminalWindow*>(widget->focusWidget());
    if (!termWindow || terminalList.indexOf(termWindow) == -1)
        return NULL;
    return termWindow;
}

void ModeManager::setFocusToCurrentMode()
{
    IMode *mode = findMode(currentMode());
    QTC_ASSERT(mode, return);
    QWidget *widget = mode->widget();
    if (widget) {
        QWidget *focusWidget = widget->focusWidget();
        if (!focusWidget)
            focusWidget = widget;
        focusWidget->setFocus();
    }
}

void ModeManager::setFocusToCurrentMode()
{
    IMode *mode = currentMode();
    QTC_ASSERT(mode, return);
    QWidget *widget = mode->widget();
    if (widget) {
        QWidget *focusWidget = widget->focusWidget();
        if (!focusWidget)
            focusWidget = widget;
        focusWidget->setFocus();
        ICore::raiseWindow(focusWidget);
    }
}

void QApplicationPrivate::closePopup(QWidget *popup)
{
    Q_Q(QApplication);
    if (!popupWidgets)
        return;
    popupWidgets->removeAll(popup);

//###
//     if (popup == qt_popup_down) {
//         qt_button_down = 0;
//         qt_popup_down = 0;
//     }

    if (QApplicationPrivate::popupWidgets->count() == 0) {                // this was the last popup
        delete QApplicationPrivate::popupWidgets;
        QApplicationPrivate::popupWidgets = 0;

        //### replay mouse event?

        //### transfer/release mouse grab

        //### transfer/release keyboard grab

        //give back focus

        if (active_window) {
            if (QWidget *fw = active_window->focusWidget()) {
                if (fw != QApplication::focusWidget()) {
                    fw->setFocus(Qt::PopupFocusReason);
                } else {
                    QFocusEvent e(QEvent::FocusIn, Qt::PopupFocusReason);
                    q->sendEvent(fw, &e);
                }
            }
        }

    } else {
        // A popup was closed, so the previous popup gets the focus.

        QWidget* aw = QApplicationPrivate::popupWidgets->last();
        if (QWidget *fw = aw->focusWidget())
            fw->setFocus(Qt::PopupFocusReason);

        //### regrab the keyboard and mouse in case 'popup' lost the grab


    }

}

void QWidgetWindow::handleKeyEvent(QKeyEvent *event)
{
    if (QApplicationPrivate::instance()->modalState() && !qt_try_modal(m_widget, event->type()))
        return;

    QObject *receiver = QWidget::keyboardGrabber();
    if (!receiver && QApplicationPrivate::inPopupMode()) {
        QWidget *popup = QApplication::activePopupWidget();
        QWidget *popupFocusWidget = popup->focusWidget();
        receiver = popupFocusWidget ? popupFocusWidget : popup;
    }
    if (!receiver)
        receiver = focusObject();
    QGuiApplication::sendSpontaneousEvent(receiver, event);
}

void QWidgetWindow::handleGestureEvent(QNativeGestureEvent *e)
{
    // copy-pasted code to find correct widget follows:
    QObject *receiver = 0;
    if (QApplicationPrivate::inPopupMode()) {
        QWidget *popup = QApplication::activePopupWidget();
        QWidget *popupFocusWidget = popup->focusWidget();
        receiver = popupFocusWidget ? popupFocusWidget : popup;
    }
    if (!receiver)
        receiver = QApplication::widgetAt(e->globalPos());
    if (!receiver)
        receiver = m_widget; // last resort

    QApplication::sendSpontaneousEvent(receiver, e);
}