C++ QDockWidgetLayout类代码示例

void QDockWidgetPrivate::initDrag(const QPoint &pos, bool nca)
{
    if (state != 0)
        return;

    Q_Q(QDockWidget);
    QMainWindow *win = qobject_cast<QMainWindow*>(parent);
    Q_ASSERT(win != 0);
    QMainWindowLayout *layout = qt_mainwindow_layout(win);
    Q_ASSERT(layout != 0);
    if (layout->pluggingWidget != 0) // the main window is animating a docking operation
        return;

    state = new QDockWidgetPrivate::DragState;
    state->dragging = false;
    state->widgetItem = 0;
    state->ownWidgetItem = false;
    state->nca = nca;
    state->ctrlDrag = false;

    if (!q->isFloating()) {
        // When dragging the widget out of the docking area,
        // use the middle of title area as pressPos
        QDockWidgetLayout *dwlayout = qobject_cast<QDockWidgetLayout*>(q->layout());
        Q_ASSERT(dwlayout != 0);
        int width = undockedGeometry.isNull() ? q->width() : undockedGeometry.width();
        state->pressPos.setY(dwlayout->titleArea().height() / 2);
        state->pressPos.setX(width / 2);
    } else {
        state->pressPos = pos;
    }
}

/*! \reimp */
void QDockWidget::paintEvent(QPaintEvent *event)
{
    Q_UNUSED(event)

    QDockWidgetLayout *layout
        = qobject_cast<QDockWidgetLayout*>(this->layout());
    bool customTitleBar = layout->widgetForRole(QDockWidgetLayout::TitleBar) != 0;
    bool nativeDeco = layout->nativeWindowDeco();

    if (!nativeDeco && !customTitleBar) {
        QStylePainter p(this);
        // ### Add PixelMetric to change spacers, so style may show border
        // when not floating.
        if (isFloating()) {
            QStyleOptionFrame framOpt;
            framOpt.init(this);
            p.drawPrimitive(QStyle::PE_FrameDockWidget, framOpt);
        }

        // Title must be painted after the frame, since the areas overlap, and
        // the title may wish to extend out to all sides (eg. XP style)
        QStyleOptionDockWidgetV2 titleOpt;
        initStyleOption(&titleOpt);
        p.drawControl(QStyle::CE_DockWidgetTitle, titleOpt);
    }
}

void QDockWidgetPrivate::init()
{
    Q_Q(QDockWidget);

    QDockWidgetLayout *layout = new QDockWidgetLayout(q);
    layout->setSizeConstraint(QLayout::SetMinAndMaxSize);

    QAbstractButton *button = new QDockWidgetTitleButton(q);
    button->setObjectName(QLatin1String("qt_dockwidget_floatbutton"));
    QObject::connect(button, SIGNAL(clicked()), q, SLOT(_q_toggleTopLevel()));
    layout->setWidgetForRole(QDockWidgetLayout::FloatButton, button);

    button = new QDockWidgetTitleButton(q);
    button->setObjectName(QLatin1String("qt_dockwidget_closebutton"));
    QObject::connect(button, SIGNAL(clicked()), q, SLOT(close()));
    layout->setWidgetForRole(QDockWidgetLayout::CloseButton, button);

    resizer = new QWidgetResizeHandler(q);
    resizer->setMovingEnabled(false);
    resizer->setActive(false);

#ifndef QT_NO_ACTION
    toggleViewAction = new QAction(q);
    toggleViewAction->setCheckable(true);
    fixedWindowTitle = qt_setWindowTitle_helperHelper(q->windowTitle(), q);
    toggleViewAction->setText(fixedWindowTitle);
    QObject::connect(toggleViewAction, SIGNAL(triggered(bool)),
                        q, SLOT(_q_toggleView(bool)));
#endif

    updateButtons();
}

/*! \reimp */
void QDockWidget::changeEvent(QEvent *event)
{
    Q_D(QDockWidget);
    QDockWidgetLayout *layout = qobject_cast<QDockWidgetLayout*>(this->layout());

    switch (event->type()) {
    case QEvent::ModifiedChange:
    case QEvent::WindowTitleChange:
        update(layout->titleArea());
#ifndef QT_NO_ACTION
        d->fixedWindowTitle = qt_setWindowTitle_helperHelper(windowTitle(), this);
        d->toggleViewAction->setText(d->fixedWindowTitle);
#endif
#ifndef QT_NO_TABBAR
        {
            QMainWindow *win = qobject_cast<QMainWindow*>(parentWidget());
            if (QMainWindowLayout *winLayout = qt_mainwindow_layout(win)) {
                if (QDockAreaLayoutInfo *info = winLayout->layoutState.dockAreaLayout.info(this))
                    info->updateTabBar();
            }
        }
#endif // QT_NO_TABBAR
        break;
    default:
        break;
    }
    QWidget::changeEvent(event);
}

void QDockWidget::setTitleBarWidget(QWidget *widget)
{
    Q_D(QDockWidget);
    QDockWidgetLayout *layout
        = qobject_cast<QDockWidgetLayout*>(this->layout());
    layout->setWidget(QDockWidgetLayout::TitleBar, widget);
    d->updateButtons();
}

void QDockWidgetPrivate::unplug(const QRect &rect)
{
    Q_Q(QDockWidget);
    QRect r = rect;
    r.moveTopLeft(q->mapToGlobal(QPoint(0, 0)));
#ifndef Q_WS_X11
    QDockWidgetLayout *layout = qobject_cast<QDockWidgetLayout*>(q->layout());
    r.adjust(0, layout->titleHeight(), 0, 0);
#endif
    setWindowState(true, true, r);
}

bool QDockWidgetPrivate::mouseDoubleClickEvent(QMouseEvent *event)
{
    QDockWidgetLayout *dwLayout = qobject_cast<QDockWidgetLayout*>(layout);

    if (!dwLayout->nativeWindowDeco()) {
        QRect titleArea = dwLayout->titleArea();

        if (event->button() == Qt::LeftButton && titleArea.contains(event->pos()) &&
            hasFeature(this, QDockWidget::DockWidgetFloatable)) {
            _q_toggleTopLevel();
            return true;
        }
    }
    return false;
}

void tst_QDockWidget::taskQTBUG_1665_closableChanged()
{
    QDockWidget dock;
    dock.show();
    QVERIFY(QTest::qWaitForWindowExposed(&dock));

    QDockWidgetLayout *l = qobject_cast<QDockWidgetLayout*>(dock.layout());

    if (l && !l->nativeWindowDeco())
        QSKIP("this machine doesn't support native dock widget");

    QVERIFY(dock.windowFlags() & Qt::WindowCloseButtonHint);

    //now let's remove the closable attribute
    dock.setFeatures(dock.features() ^ QDockWidget::DockWidgetClosable);
    QVERIFY(!(dock.windowFlags() & Qt::WindowCloseButtonHint));
}

/*!
    \property QDockWidget::floating
    \brief whether the dock widget is floating

    A floating dock widget is presented to the user as an independent
    window "on top" of its parent QMainWindow, instead of being
    docked in the QMainWindow.

    \sa isWindow()
*/
void QDockWidget::setFloating(bool floating)
{
    Q_D(QDockWidget);

    // the initial click of a double-click may have started a drag...
    if (d->state != 0)
        d->endDrag(true);

    QRect r = d->undockedGeometry;

    if (floating && r.isNull()) {
        QDockWidgetLayout *layout = qobject_cast<QDockWidgetLayout*>(this->layout());
        QRect titleArea = layout->titleArea();
        int h = layout->verticalTitleBar ? titleArea.width() : titleArea.height();
        QPoint p = mapToGlobal(QPoint(h, h));
        r = QRect(p, size());
    }

    d->setWindowState(floating, false, floating ? r : QRect());
}

bool QDockWidgetPrivate::mouseMoveEvent(QMouseEvent *event)
{
    bool ret = false;
#if !defined(QT_NO_MAINWINDOW)
    Q_Q(QDockWidget);

    if (!state)
        return ret;

    QDockWidgetLayout *dwlayout
        = qobject_cast<QDockWidgetLayout*>(layout);
    QMainWindowLayout *mwlayout
        = qobject_cast<QMainWindowLayout*>(q->parentWidget()->layout());
    if (!dwlayout->nativeWindowDeco()) {
        if (!state->dragging
            && mwlayout->pluggingWidget == 0
            && (event->pos() - state->pressPos).manhattanLength()
                > QApplication::startDragDistance()) {
            startDrag();
#ifdef Q_OS_WIN
            grabMouseWhileInWindow();
#else
            q->grabMouse();
#endif
            ret = true;
        }
    }

    if (state->dragging && !state->nca) {
        QPoint pos = event->globalPos() - state->pressPos;
        q->move(pos);

        if (!state->ctrlDrag)
            mwlayout->hover(state->widgetItem, event->globalPos());

        ret = true;
    }

#endif // !defined(QT_NO_MAINWINDOW)
    return ret;
}

/*!
    Returns the widget for the dock widget. This function returns zero
    if the widget has not been set.

    \sa setWidget()
*/
QWidget *QDockWidget::widget() const
{
    QDockWidgetLayout *layout = qobject_cast<QDockWidgetLayout*>(this->layout());
    return layout->widgetForRole(QDockWidgetLayout::Content);
}

QWidget *QDockWidget::titleBarWidget() const
{
    QDockWidgetLayout *layout
        = qobject_cast<QDockWidgetLayout*>(this->layout());
    return layout->widgetForRole(QDockWidgetLayout::TitleBar);
}

/*!
    Sets the widget for the dock widget to \a widget.

    If the dock widget is visible when \a widget is added, you must
    \l{QWidget::}{show()} it explicitly.

    Note that you must add the layout of the \a widget before you call
    this function; if not, the \a widget will not be visible.

    \sa widget()
*/
void QDockWidget::setWidget(QWidget *widget)
{
    QDockWidgetLayout *layout = qobject_cast<QDockWidgetLayout*>(this->layout());
    layout->setWidgetForRole(QDockWidgetLayout::Content, widget);
}