qmainwindow.cpp

来自「QT 开发环境里面一个很重要的文件」· C++ 代码 · 共 1,111 行 · 第 1/3 页

    \e Note: if \a first is currently in a tabbed docked area, \a second will
    be added as a new tab, not as a neighbor of \a first. This is because a
    single tab can contain only one dock widget.

    \e Note: The Qt::LayoutDirection influences the order of the dock widgets
    in the two parts of the divided area. When right-to-left layout direction
    is enabled, the placing of the dock widgets will be reversed.

    \sa tabifyDockWidget(), addDockWidget(), removeDockWidget()
*/
void QMainWindow::splitDockWidget(QDockWidget *after, QDockWidget *dockwidget,
                                  Qt::Orientation orientation)
{
    if (!dockwidget->isAreaAllowed(dockWidgetArea(after)))
        qWarning("QMainWindow::splitDockWidget(): specified 'area' is not an allowed for this widget");
    d_func()->layout->splitDockWidget(after, dockwidget, orientation);
    if (isVisible())
        d_func()->layout->relayout();
}

/*!
    \fn void QMainWindow::tabifyDockWidget(QDockWidget *first, QDockWidget *second)

    Moves \a second dock widget on top of \a first dock widget, creating a tabbed
    docked area in the main window.
*/
void QMainWindow::tabifyDockWidget(QDockWidget *first, QDockWidget *second)
{
    if (!second->isAreaAllowed(dockWidgetArea(first)))
        qWarning("QMainWindow::splitDockWidget(): specified 'area' is not an allowed for this widget");
    d_func()->layout->tabifyDockWidget(first, second);
    if (isVisible())
        d_func()->layout->relayout();
}

/*!
    Removes the \a dockwidget from the main window layout and hides
    it. Note that the \a dockwidget is \e not deleted.
*/
void QMainWindow::removeDockWidget(QDockWidget *dockwidget)
{
    if (dockwidget) {
        d_func()->layout->removeWidget(dockwidget);
        dockwidget->hide();
    }
}

/*!
    Returns the Qt::DockWidgetArea for \a dockwidget. If \a dockwidget
    has not been added to the main window, this function returns \c
    Qt::NoDockWidgetArea.

    \sa addDockWidget() splitDockWidget() Qt::DockWidgetArea
*/
Qt::DockWidgetArea QMainWindow::dockWidgetArea(QDockWidget *dockwidget) const
{ return d_func()->layout->dockWidgetArea(dockwidget); }

#endif // QT_NO_DOCKWIDGET

/*!
    Saves the current state of this mainwindow's toolbars and
    dockwidgets. The \a version number is stored as part of the data.

    The \link QObject::objectName objectName\endlink property is used
    to identify each QToolBar and QDockWidget.  You should make sure
    that this property is unique for each QToolBar and QDockWidget you
    add to the QMainWindow

    To restore the saved state, pass the return value and \a version
    number to restoreState().

    \sa restoreState()
*/
QByteArray QMainWindow::saveState(int version) const
{
    QByteArray data;
    QDataStream stream(&data, QIODevice::WriteOnly);
    stream << QMainWindowLayout::VersionMarker;
    stream << version;
    d_func()->layout->saveState(stream);
    return data;
}

/*!
    Restores the \a state of this mainwindow's toolbars and
    dockwidgets. The \a version number is compared with that stored
    in \a state. If they do not match, the mainwindow's state is left
    unchanged, and this function returns \c false; otherwise, the state
    is restored, and this function returns \c true.

    \sa saveState()
*/
bool QMainWindow::restoreState(const QByteArray &state, int version)
{
    if (state.isEmpty())
        return false;
    QByteArray sd = state;
    QDataStream stream(&sd, QIODevice::ReadOnly);
    int marker, v;
    stream >> marker;
    stream >> v;
    if (stream.status() != QDataStream::Ok || marker != QMainWindowLayout::VersionMarker || v != version)
        return false;
    bool restored = d_func()->layout->restoreState(stream);
    if (isVisible())
        QApplication::postEvent(this, new QResizeEvent(size(), size()));
    return restored;
}

#if !defined(QT_NO_DOCKWIDGET) && !defined(QT_NO_CURSOR)
QCursor QMainWindowPrivate::separatorCursor(const QList<int> &path) const
{
    QDockAreaLayoutInfo *info = layout->dockWidgetLayout.info(path);
    Q_ASSERT(info != 0);
    if (path.size() == 1) {
        return info->o == Qt::Horizontal
                ? Qt::SplitVCursor : Qt::SplitHCursor;
    }

    return info->o == Qt::Horizontal
            ? Qt::SplitHCursor : Qt::SplitVCursor;
}

void QMainWindowPrivate::adjustCursor(const QPoint &pos)
{
    Q_Q(QMainWindow);

    hoverPos = pos;

    if (pos == QPoint(0, 0)) {
        if (!hoverSeparator.isEmpty())
            q->update(layout->dockWidgetLayout.separatorRect(hoverSeparator));
        hoverSeparator.clear();
        q->unsetCursor();
    } else {
        QList<int> pathToSeparator
            = layout->dockWidgetLayout.findSeparator(pos);

        if (pathToSeparator != hoverSeparator) {
            if (!hoverSeparator.isEmpty())
                q->update(layout->dockWidgetLayout.separatorRect(hoverSeparator));

            hoverSeparator = pathToSeparator;

            if (hoverSeparator.isEmpty()) {
                q->unsetCursor();
            } else {
                q->update(layout->dockWidgetLayout.separatorRect(hoverSeparator));
                QCursor cursor = separatorCursor(hoverSeparator);
                q->setCursor(cursor);
            }
        }
    }
}
#endif

/*! \reimp */
bool QMainWindow::event(QEvent *event)
{
    Q_D(QMainWindow);
    switch (event->type()) {

#ifndef QT_NO_DOCKWIDGET
        case QEvent::Paint: {
            QPainter p(this);
            QRegion r = static_cast<QPaintEvent*>(event)->region();
            d->layout->dockWidgetLayout.paintSeparators(&p, this, r, d->hoverPos);
            break;
        }

#ifndef QT_NO_CURSOR
        case QEvent::HoverMove:  {
            d->adjustCursor(static_cast<QHoverEvent*>(event)->pos());
            break;
        }

        case QEvent::HoverLeave:
            d->adjustCursor(QPoint(0, 0));
            break;
#endif // QT_NO_CURSOR

        case QEvent::MouseButtonPress: {
            QMouseEvent *e = static_cast<QMouseEvent*>(event);
            if (e->button() == Qt::LeftButton && d->layout->startSeparatorMove(e->pos())) {
                // The click was on a separator, eat this event
                e->accept();
                return true;
            }
            break;
        }

        case QEvent::MouseMove: {
            QMouseEvent *e = static_cast<QMouseEvent*>(event);

#ifndef QT_NO_CURSOR
            d->adjustCursor(e->pos());
#endif
            if (e->buttons() & Qt::LeftButton) {
                if (d->layout->separatorMove(e->pos())) {
                    // We're moving a separator, eat this event
                    e->accept();
                    return true;
                }
            }

            break;
        }

        case QEvent::MouseButtonRelease: {
            QMouseEvent *e = static_cast<QMouseEvent*>(event);
            if (d->layout->endSeparatorMove(e->pos())) {
                // We've released a separator, eat this event
                e->accept();
                return true;
            }
            break;
        }

#endif

#ifndef QT_NO_TOOLBAR
        case QEvent::ToolBarChange: {
            QList<QToolBar *> toolbars = qFindChildren<QToolBar *>(this);
            QSize minimumSize = d->layout->minimumSize();
            for (int i = 0; i < toolbars.size(); ++i) {
                QToolBar *toolbar = toolbars.at(i);
                toolbar->setVisible(!toolbar->isVisible());
            }
            QApplication::sendPostedEvents(this, QEvent::LayoutRequest);
            QSize newMinimumSize = d->layout->minimumSize();
            QSize delta = newMinimumSize - minimumSize;
            resize(size() + delta);
            return true;
        }
#endif

#ifndef QT_NO_STATUSTIP
        case QEvent::StatusTip:
#ifndef QT_NO_STATUSBAR
            if (QStatusBar *sb = d->layout->statusBar())
                sb->showMessage(static_cast<QStatusTipEvent*>(event)->tip());
            else
#endif
                static_cast<QStatusTipEvent*>(event)->ignore();
            return true;
#endif // QT_NO_STATUSTIP

        case QEvent::StyleChange:
            if (!d->explicitIconSize)
                setIconSize(QSize());
            break;

        default:
            break;
    }

    return QWidget::event(event);
}

/*!
    \internal
*/
bool QMainWindow::isSeparator(const QPoint &pos) const
{
    Q_D(const QMainWindow);
#ifndef QT_NO_DOCKWIDGET
    return !d->layout->dockWidgetLayout.findSeparator(pos).isEmpty();
#else
    return false;
#endif
}

/*!
    \reimp
*/
void QMainWindow::contextMenuEvent(QContextMenuEvent *event)
{
    // only show the context menu for direct QDockWidget and QToolBar
    // children
    QWidget *child = childAt(event->pos());
    while (child && child != this) {
#ifndef QT_NO_DOCKWIDGET
        if (QDockWidget *dw = qobject_cast<QDockWidget *>(child)) {
            if (dw->parentWidget() != this)
                return;
            if (dw->widget()
                && dw->widget()->geometry().contains(child->mapFrom(this, event->pos()))) {
                // ignore the event if the mouse is over the QDockWidget contents
                return;
            }
            break;
        }
#endif // QT_NO_DOCKWIDGET
#ifndef QT_NO_TOOLBAR
        if (QToolBar *tb = qobject_cast<QToolBar *>(child)) {
            if (tb->parentWidget() != this)
                return;
            break;
        }
#endif
        child = child->parentWidget();
    }
    if (child == this)
        return;

#ifndef QT_NO_MENU
    QMenu *popup = createPopupMenu();
    if (!popup)
	return;
    popup->exec(event->globalPos());
    delete popup;
    event->accept();
#endif
}

#ifndef QT_NO_MENU
/*!
    Returns a popup menu containing checkable entries for the toolbars and
    dock widgets present in the main window.

    By default, this function is called by the main window when the user
    activates a context menu, typically by right-clicking on a toolbar or a dock
    widget.

    If you want to create a custom popup menu, reimplement this function and
    return a newly-created popup menu. Ownership of the popup menu is transferred
    to the caller.

    \sa addDockWidget(), addToolBar(), menuBar()
*/
QMenu *QMainWindow::createPopupMenu()
{
    Q_D(QMainWindow);
    QMenu *menu = 0;
#ifndef QT_NO_DOCKWIDGET
    QList<QDockWidget *> dockwidgets = qFindChildren<QDockWidget *>(this);
    if (dockwidgets.size()) {
        menu = new QMenu(this);
        for (int i = 0; i < dockwidgets.size(); ++i) {
            QDockWidget *dockWidget = dockwidgets.at(i);
            if (dockWidget->parentWidget() == this
                && d->layout->contains(dockWidget)) {
                menu->addAction(dockwidgets.at(i)->toggleViewAction());
            }
        }
        menu->addSeparator();
    }
#endif // QT_NO_DOCKWIDGET
#ifndef QT_NO_TOOLBAR
    QList<QToolBar *> toolbars = qFindChildren<QToolBar *>(this);
    if (toolbars.size()) {
        if (!menu)
            menu = new QMenu(this);
        for (int i = 0; i < toolbars.size(); ++i) {
            QToolBar *toolBar = toolbars.at(i);
            if (toolBar->parentWidget() == this
                && d->layout->contains(toolBar)) {
                menu->addAction(toolbars.at(i)->toggleViewAction());
            }
        }
    }
#endif
    Q_UNUSED(d);
    return menu;
}
#endif // QT_NO_MENU

#endif // QT_NO_MAINWINDOW