qdockwidget.cpp

奇趣公司比较新的qt/emd版本

    int mw = q->style()->pixelMetric(QStyle::PM_DockWidgetTitleMargin, 0, q);
    int fw = q->style()->pixelMetric(QStyle::PM_DockWidgetFrameWidth, 0, q);

    return pick(verticalTitleBar, closeSize)
            + pick(verticalTitleBar, floatSize)
            + titleHeight + 2*fw + 3*mw;
}

int QDockWidgetLayout::titleHeight() const
{
    QDockWidget *q = qobject_cast<QDockWidget*>(parentWidget());

    if (QWidget *title = widget(TitleBar))
        return perp(verticalTitleBar, title->sizeHint());

    QSize closeSize(0, 0);
    QSize floatSize(0, 0);
    if (QLayoutItem *item = item_list[CloseButton])
        closeSize = item->widget()->sizeHint();
    if (QLayoutItem *item = item_list[FloatButton])
        floatSize = item->widget()->sizeHint();

    int buttonHeight = qMax(perp(verticalTitleBar, closeSize),
                            perp(verticalTitleBar, floatSize));

    QFontMetrics titleFontMetrics = q->fontMetrics();
#ifdef Q_WS_MAC
    if (qobject_cast<QMacStyle *>(q->style())) {
        extern QHash<QByteArray, QFont> *qt_app_fonts_hash(); // qapplication.cpp
        QFont font = qt_app_fonts_hash()->value("QToolButton", q->font());
        titleFontMetrics = QFontMetrics(font);
    }
#endif

    int mw = q->style()->pixelMetric(QStyle::PM_DockWidgetTitleMargin, 0, q);

    return qMax(buttonHeight + 2, titleFontMetrics.lineSpacing() + 2*mw);
}

void QDockWidgetLayout::setGeometry(const QRect &geometry)
{
    QDockWidget *q = qobject_cast<QDockWidget*>(parentWidget());

    bool nativeDeco = nativeWindowDeco();

    int fw = q->isFloating() && !nativeDeco
            ? q->style()->pixelMetric(QStyle::PM_DockWidgetFrameWidth, 0, 0)
            : 0;

    if (nativeDeco) {
        if (QLayoutItem *item = item_list[Content])
            item->setGeometry(geometry);
    } else {
        int titleHeight = this->titleHeight();

        if (verticalTitleBar) {
            _titleArea = QRect(QPoint(fw, fw),
                                QSize(titleHeight, geometry.height() - (fw * 2)));
        } else {
            _titleArea = QRect(QPoint(fw, fw),
                                QSize(geometry.width() - (fw * 2), titleHeight));
        }

        if (QLayoutItem *item = item_list[TitleBar]) {
            item->setGeometry(_titleArea);
        } else {
            QStyleOptionDockWidgetV2 opt;
            q->initStyleOption(&opt);

            if (QLayoutItem *item = item_list[CloseButton]) {
                if (!item->isEmpty()) {
                    QRect r = q->style()
                        ->subElementRect(QStyle::SE_DockWidgetCloseButton,
                                            &opt, q);
                    if (!r.isNull())
                        item->setGeometry(r);
                }
            }

            if (QLayoutItem *item = item_list[FloatButton]) {
                if (!item->isEmpty()) {
                    QRect r = q->style()
                        ->subElementRect(QStyle::SE_DockWidgetFloatButton,
                                            &opt, q);
                    if (!r.isNull())
                        item->setGeometry(r);
                }
            }
        }

        if (QLayoutItem *item = item_list[Content]) {
            QRect r = geometry;
            if (verticalTitleBar) {
                r.setLeft(_titleArea.right() + 1);
                r.adjust(0, fw, -fw, -fw);
            } else {
                r.setTop(_titleArea.bottom() + 1);
                r.adjust(fw, 0, -fw, -fw);
            }
            item->setGeometry(r);
        }
    }

    QLayoutItem *item = item_list[Content];
    if (item != 0 && q->isFloating()) {
        QSize s = sizeFromContent(item->maximumSize(), true);
        q->setMaximumSize(s);
    } else {
        q->setMaximumSize(QWIDGETSIZE_MAX, QWIDGETSIZE_MAX);
    }
}

void QDockWidgetLayout::setVerticalTitleBar(bool b)
{
    if (b == verticalTitleBar)
        return;
    verticalTitleBar = b;
    invalidate();
    parentWidget()->update();
}

/******************************************************************************
** QDockWidgetItem
*/

QDockWidgetItem::QDockWidgetItem(QDockWidget *dockWidget)
    : QWidgetItem(dockWidget)
{
}

QSize QDockWidgetItem::minimumSize() const
{
    QSize widgetMin(0, 0);
    if (QLayoutItem *item = dockWidgetChildItem())
        widgetMin = item->minimumSize();
    return dockWidgetLayout()->sizeFromContent(widgetMin, false);
}

QSize QDockWidgetItem::maximumSize() const
{
    if (QLayoutItem *item = dockWidgetChildItem())
        return dockWidgetLayout()->sizeFromContent(item->maximumSize(), false);
    return QSize(QWIDGETSIZE_MAX, QWIDGETSIZE_MAX);
}

QSize QDockWidgetItem::sizeHint() const
{
    if (QLayoutItem *item = dockWidgetChildItem())
        return dockWidgetLayout()->sizeFromContent(item->sizeHint(), false);
    return minimumSize();
}

/******************************************************************************
** QDockWidgetPrivate
*/

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

    QDockWidgetLayout *layout = new QDockWidgetLayout(q);

    QAbstractButton *button = new QDockWidgetTitleButton(q);
    QObject::connect(button, SIGNAL(clicked()), q, SLOT(_q_toggleTopLevel()));
    layout->setWidget(QDockWidgetLayout::FloatButton, button);

    button = new QDockWidgetTitleButton(q);
    QObject::connect(button, SIGNAL(clicked()), q, SLOT(close()));
    layout->setWidget(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();
}

/*!
    Initialize \a option with the values from this QDockWidget. This method
    is useful for subclasses when they need a QStyleOptionDockWidget, but don't want
    to fill in all the information themselves.

    \sa QStyleOption::initFrom()
*/
void QDockWidget::initStyleOption(QStyleOptionDockWidget *option) const
{
    Q_D(const QDockWidget);

    if (!option)
        return;
    QDockWidgetLayout *dwlayout = qobject_cast<QDockWidgetLayout*>(layout());

    option->initFrom(this);
    option->rect = dwlayout->titleArea();
    option->title = d->fixedWindowTitle;
    option->closable = hasFeature(this, QDockWidget::DockWidgetClosable);
    option->movable = hasFeature(this, QDockWidget::DockWidgetMovable);
    option->floatable = hasFeature(this, QDockWidget::DockWidgetFloatable);

    QDockWidgetLayout *l = qobject_cast<QDockWidgetLayout*>(layout());
    QStyleOptionDockWidgetV2 *v2
        = qstyleoption_cast<QStyleOptionDockWidgetV2*>(option);
    if (v2 != 0)
        v2->verticalTitleBar = l->verticalTitleBar;
}

void QDockWidgetPrivate::_q_toggleView(bool b)
{
    Q_Q(QDockWidget);
    if (b == q->isHidden()) {
        if (b)
            q->show();
        else
            q->close();
    }
}

void QDockWidgetPrivate::updateButtons()
{
    Q_Q(QDockWidget);
    QDockWidgetLayout *layout = qobject_cast<QDockWidgetLayout*>(q->layout());

    QStyleOptionDockWidget opt;
    q->initStyleOption(&opt);

    bool customTitleBar = layout->widget(QDockWidgetLayout::TitleBar) != 0;
    bool nativeDeco = layout->nativeWindowDeco();
    bool hideButtons = nativeDeco || customTitleBar;

    bool canClose = hasFeature(q, QDockWidget::DockWidgetClosable);
    bool canFloat = hasFeature(q, QDockWidget::DockWidgetFloatable);

    QAbstractButton *button
        = qobject_cast<QAbstractButton*>(layout->widget(QDockWidgetLayout::FloatButton));
    button->setIcon(q->style()->standardIcon(QStyle::SP_TitleBarNormalButton));
    button->setVisible(canFloat && !hideButtons);

    button
        = qobject_cast <QAbstractButton*>(layout->widget(QDockWidgetLayout::CloseButton));
    button->setIcon(q->style()->standardIcon(QStyle::SP_TitleBarCloseButton));
    button->setVisible(canClose && !hideButtons);

    q->setAttribute(Qt::WA_ContentsPropagated,
                    (canFloat || canClose) && !hideButtons);

    layout->invalidate();
}

void QDockWidgetPrivate::_q_toggleTopLevel()
{
    Q_Q(QDockWidget);
    q->setFloating(!q->isFloating());
}

void QDockWidgetPrivate::initDrag(const QPoint &pos, bool nca)
{
    Q_Q(QDockWidget);

    if (state != 0)
        return;

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

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

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

    if (state == 0 || state->dragging)
        return;

    QMainWindowLayout *layout
        = qobject_cast<QMainWindowLayout *>(q->parentWidget()->layout());
    Q_ASSERT(layout != 0);

    state->widgetItem = layout->unplug(q);
    if (state->widgetItem == 0) {
        /* I have a QMainWindow parent, but I was never inserted with
            QMainWindow::addDockWidget, so the QMainWindowLayout has no
            widget item for me. :( I have to create it myself, and then
            delete it if I don't get dropped into a dock area. */
        state->widgetItem = new QDockWidgetItem(q);
        state->ownWidgetItem = true;
    }

    if (state->ctrlDrag)
        layout->restore();

    state->dragging = true;
}

void QDockWidgetPrivate::endDrag(bool abort)
{
    Q_Q(QDockWidget);
    Q_ASSERT(state != 0);

    q->releaseMouse();

    if (state->dragging) {
        QMainWindowLayout *layout =
            qobject_cast<QMainWindowLayout *>(q->parentWidget()->layout());
        Q_ASSERT(layout != 0);

        if (abort || !layout->plug(state->widgetItem)) {
            if (::hasFeature(q, QDockWidget::DockWidgetFloatable)) {
                if (state->ownWidgetItem)
                    delete state->widgetItem;
                layout->restore();
#ifdef Q_WS_X11
                // get rid of the X11BypassWindowManager window flag and activate the resizer
                Qt::WindowFlags flags = q->windowFlags();
                flags &= ~Qt::X11BypassWindowManagerHint;
                q->setWindowFlags(flags);
                resizer->setActive(QWidgetResizeHandler::Resize, true);
                q->show();
#else
                QDockWidgetLayout *myLayout
                    = qobject_cast<QDockWidgetLayout*>(q->layout());
                resizer->setActive(QWidgetResizeHandler::Resize,
                                    myLayout->widget(QDockWidgetLayout::TitleBar) != 0);
#endif
                undockedGeometry = q->geometry();
                q->activateWindow();
            } else {
                layout->revert(state->widgetItem);
            }
        }
    }
    delete state;
    state = 0;
}

bool QDockWidgetPrivate::isAnimating() const
{
    Q_Q(const QDockWidget);

    QMainWindow *mainWin = qobject_cast<QMainWindow*>(q->parentWidget());
    if (mainWin == 0)
        return false;

    QMainWindowLayout *mainWinLayout
        = qobject_cast<QMainWindowLayout*>(mainWin->layout());
    if (mainWinLayout == 0)
        return false;

    return (void*)mainWinLayout->pluggingWidget == (void*)q;
}

void QDockWidgetPrivate::mousePressEvent(QMouseEvent *event)
{
#if !defined(QT_NO_MAINWINDOW)
    Q_Q(QDockWidget);

    QDockWidgetLayout *layout
        = qobject_cast<QDockWidgetLayout*>(q->layout());

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

        if (event->button() != Qt::LeftButton)
            return;
        if (!titleArea.contains(event->pos()))
            return;
        // check if the tool window is movable... do nothing if it is not
        if (!::hasFeature(q, QDockWidget::DockWidgetMovable))