qmdisubwindow.cpp

奇趣公司比较新的qt/emd版本

        if (QMainWindow *mainWindow = qobject_cast<QMainWindow *>(q->window())) {
#ifdef QT_NO_MENUBAR
            Q_UNUSED(mainWindow);
#else
            showButtonsInMenuBar(mainWindow->menuBar());
#endif
        } else
#endif // QT_NO_MAINWINDOW
        if (!controlContainer) {
            controlContainer = new ControlContainer(q);
        }
    }

    QWidget *parent = q->parentWidget();
    QRect availableRect = parent->contentsRect();

    // Adjust geometry if the sub-window is inside a scroll area.
    QAbstractScrollArea *scrollArea = qobject_cast<QAbstractScrollArea *>(parent->parentWidget());
    if (scrollArea && scrollArea->viewport() == parent) {
        QScrollBar *hbar = scrollArea->horizontalScrollBar();
        QScrollBar *vbar = scrollArea->verticalScrollBar();
        const int xOffset = hbar ? hbar->value() : 0;
        const int yOffset = vbar ? vbar->value() : 0;
        availableRect.adjust(-xOffset, -yOffset, -xOffset, -yOffset);
        oldGeometry.adjust(xOffset, yOffset, xOffset, yOffset);
    }

    setNewGeometry(&availableRect);
    // QWidget::setGeometry will reset Qt::WindowMaximized so we have to update it here.
    ensureWindowState(Qt::WindowMaximized);

    if (wasVisible)
        q->setVisible(true);

    resizeEnabled = false;
    moveEnabled = false;

#ifndef QT_NO_ACTION
    setEnabled(MoveAction, moveEnabled);
    setEnabled(MaximizeAction, false);
    setEnabled(MinimizeAction, true);
    setEnabled(RestoreAction, true);
    setEnabled(ResizeAction, resizeEnabled);
#endif // QT_NO_ACTION

    Q_ASSERT(q->windowState() & Qt::WindowMaximized);
    Q_ASSERT(!(q->windowState() & Qt::WindowMinimized));

    restoreFocus();
    updateMask();
}

/*!
    \internal
*/
void QMdiSubWindowPrivate::setActive(bool activate)
{
    Q_Q(QMdiSubWindow);
    if (!q->parent() || !activationEnabled)
        return;

    if (activate && !isActive && q->isEnabled()) {
        isActive = true;
        isExplicitlyDeactivated = false;
        Qt::WindowStates oldWindowState = q->windowState();
        ensureWindowState(Qt::WindowActive);
        emit q->aboutToActivate();
        if (q->isMaximized() && !drawTitleBarWhenMaximized()) {
#ifndef QT_NO_MAINWINDOW
            if (QMainWindow *mainWindow = qobject_cast<QMainWindow *>(q->window())) {
#ifdef QT_NO_MENUBAR
                Q_UNUSED(mainWindow);
#else
                showButtonsInMenuBar(mainWindow->menuBar());
#endif
            }
#endif // QT_NO_MAINWINDOW
        }
        Q_ASSERT(isActive);
        emit q->windowStateChanged(oldWindowState, q->windowState());
    } else if (!activate && isActive) {
        isActive = false;
        Qt::WindowStates oldWindowState = q->windowState();
        q->overrideWindowState(q->windowState() & ~Qt::WindowActive);
        QWidget *focusWidget = QApplication::focusWidget();
        if (focusWidget && (focusWidget == q || q->isAncestorOf(focusWidget)))
            focusWidget->clearFocus();
        if (baseWidget)
            baseWidget->overrideWindowState(baseWidget->windowState() & ~Qt::WindowActive);
        Q_ASSERT(!isActive);
        emit q->windowStateChanged(oldWindowState, q->windowState());
    }

    if (activate && isActive && q->isEnabled() && !q->hasFocus()
            && !q->isAncestorOf(QApplication::focusWidget())) {
        setFocusWidget();
        ensureWindowState(Qt::WindowActive);
    }

    int frameWidth = q->style()->pixelMetric(QStyle::PM_MdiSubWindowFrameWidth);
    int titleBarHeight = this->titleBarHeight();
    QRegion windowDecoration = QRegion(0, 0, q->width(), q->height());
    windowDecoration -= QRegion(frameWidth, titleBarHeight, q->width() - 2 * frameWidth,
                                q->height() - titleBarHeight - frameWidth);

    // Make sure we don't use cached style options if we get
    // resize events right before activation/deactivation.
    if (resizeTimerId != -1) {
        q->killTimer(resizeTimerId);
        resizeTimerId = -1;
        updateDirtyRegions();
    }

    q->update(windowDecoration);
}

/*!
    \internal
*/
void QMdiSubWindowPrivate::processClickedSubControl()
{
    Q_Q(QMdiSubWindow);
    switch (activeSubControl) {
    case QStyle::SC_TitleBarContextHelpButton:
#ifndef QT_NO_WHATSTHIS
        QWhatsThis::enterWhatsThisMode();
#endif
        break;
    case QStyle::SC_TitleBarShadeButton:
        q->showShaded();
        hoveredSubControl = QStyle::SC_TitleBarUnshadeButton;
        break;
    case QStyle::SC_TitleBarUnshadeButton:
        if (q->isShaded())
            hoveredSubControl = QStyle::SC_TitleBarShadeButton;
        q->showNormal();
        break;
    case QStyle::SC_TitleBarMinButton:
#if defined(Q_WS_MAC) && !defined(QT_NO_STYLE_MAC)
        if (qobject_cast<QMacStyle *>(q->style())) {
            if (q->isMinimized())
                q->showNormal();
            else
                q->showMinimized();
            break;
        }
#endif
        q->showMinimized();
        break;
    case QStyle::SC_TitleBarNormalButton:
        if (q->isShaded())
            hoveredSubControl = QStyle::SC_TitleBarMinButton;
        q->showNormal();
        break;
    case QStyle::SC_TitleBarMaxButton:
#if defined(Q_WS_MAC) && !defined(QT_NO_STYLE_MAC)
        if (qobject_cast<QMacStyle *>(q->style())) {
            if (q->isMaximized())
                q->showNormal();
            else
                q->showMaximized();
            break;
        }
#endif
        q->showMaximized();
        break;
    case QStyle::SC_TitleBarCloseButton:
        q->close();
        break;
    default:
        break;
    }
}

/*!
    \internal
*/
QRegion QMdiSubWindowPrivate::getRegion(Operation operation) const
{
    Q_Q(const QMdiSubWindow);
    int width = q->width();
    int height = q->height();
    int titleBarHeight = this->titleBarHeight();
    int frameWidth = q->style()->pixelMetric(QStyle::PM_MdiSubWindowFrameWidth);
    int cornerConst = titleBarHeight - frameWidth;
    int titleBarConst = 2 * titleBarHeight;

    if (operation == Move) {
        QStyleOptionTitleBar titleBarOptions = this->titleBarOptions();
        QRegion move(frameWidth, frameWidth, width - 2 * frameWidth, cornerConst);
        // Depending on which window flags are set, activated sub controllers will
        // be subtracted from the 'move' region.
        for (int i = 0; i < NumSubControls; ++i) {
            if (SubControls[i] == QStyle::SC_TitleBarLabel)
                continue;
            move -= QRegion(q->style()->subControlRect(QStyle::CC_TitleBar, &titleBarOptions,
                            SubControls[i]));
        }
        return move;
    }

    QRegion region;
#if defined(Q_WS_MAC) && !defined(QT_NO_STYLE_MAC)
    if (qobject_cast<QMacStyle *>(q->style()))
        return region;
#endif

    switch (operation) {
    case TopResize:
        region = QRegion(titleBarHeight, 0, width - titleBarConst, frameWidth);
        break;
    case BottomResize:
        region = QRegion(titleBarHeight, height - frameWidth, width - titleBarConst, frameWidth);
        break;
    case LeftResize:
        region = QRegion(0, titleBarHeight, frameWidth, height - titleBarConst);
        break;
    case RightResize:
        region = QRegion(width - frameWidth, titleBarHeight, frameWidth, height - titleBarConst);
        break;
    case TopLeftResize:
        region = QRegion(0, 0, titleBarHeight, titleBarHeight)
                 - QRegion(frameWidth, frameWidth, cornerConst, cornerConst);
        break;
    case TopRightResize:
        region =  QRegion(width - titleBarHeight, 0, titleBarHeight, titleBarHeight)
                  - QRegion(width - titleBarHeight, frameWidth, cornerConst, cornerConst);
        break;
    case BottomLeftResize:
        region = QRegion(0, height - titleBarHeight, titleBarHeight, titleBarHeight)
                 - QRegion(frameWidth, height - titleBarHeight, cornerConst, cornerConst);
        break;
    case BottomRightResize:
        region = QRegion(width - titleBarHeight, height - titleBarHeight, titleBarHeight, titleBarHeight)
                 - QRegion(width - titleBarHeight, height - titleBarHeight, cornerConst, cornerConst);
        break;
    default:
        break;
    }

    return region;
}

/*!
    \internal
*/
QMdiSubWindowPrivate::Operation QMdiSubWindowPrivate::getOperation(const QPoint &pos) const
{
    OperationInfoMap::const_iterator it;
    for (it = operationMap.constBegin(); it != operationMap.constEnd(); ++it)
        if (it.value().region.contains(pos))
            return it.key();
    return None;
}

extern QString qt_setWindowTitle_helperHelper(const QString &, QWidget *);

/*!
    \internal
*/
QStyleOptionTitleBar QMdiSubWindowPrivate::titleBarOptions() const
{
    Q_Q(const QMdiSubWindow);
    QStyleOptionTitleBar titleBarOptions;
    titleBarOptions.initFrom(q);
    if (activeSubControl != QStyle::SC_None) {
        if (hoveredSubControl == activeSubControl) {
            titleBarOptions.state |= QStyle::State_Sunken;
            titleBarOptions.activeSubControls = activeSubControl;
        }
    } else if (autoRaise() && hoveredSubControl != QStyle::SC_None
               && hoveredSubControl != QStyle::SC_TitleBarLabel) {
        titleBarOptions.state |= QStyle::State_MouseOver;
        titleBarOptions.activeSubControls = hoveredSubControl;
    } else {
        titleBarOptions.state &= ~QStyle::State_MouseOver;
        titleBarOptions.activeSubControls = QStyle::SC_None;
    }

    titleBarOptions.subControls = QStyle::SC_All;
    titleBarOptions.titleBarFlags = q->windowFlags();
    titleBarOptions.titleBarState = q->windowState();
    titleBarOptions.palette = titleBarPalette;
    titleBarOptions.icon = menuIcon;

    if (isActive) {
        titleBarOptions.state |= QStyle::State_Active;
        titleBarOptions.titleBarState |= QStyle::State_Active;
        titleBarOptions.palette.setCurrentColorGroup(QPalette::Active);
    } else {
        titleBarOptions.state &= ~QStyle::State_Active;
        titleBarOptions.palette.setCurrentColorGroup(QPalette::Inactive);
    }

    int border = hasBorder(titleBarOptions) ? 4 : 0;
    int paintHeight = titleBarHeight(titleBarOptions);
    paintHeight -= q->isMinimized() ? 2 * border : border;
    titleBarOptions.rect = QRect(border, border, q->width() - 2 * border, paintHeight);

    if (!windowTitle.isEmpty()) {
        // Set the text here before asking for the width of the title bar label
        // in case people uses the actual text to calculate the width.
        titleBarOptions.text = windowTitle;
        titleBarOptions.fontMetrics = QFontMetrics(font);
        int width = q->style()->subControlRect(QStyle::CC_TitleBar, &titleBarOptions,
                                               QStyle::SC_TitleBarLabel, q).width();
        // Set elided text if we don't have enough space for the entire title.
        titleBarOptions.text = titleBarOptions.fontMetrics.elidedText(windowTitle, Qt::ElideRight, width);
    }
    return titleBarOptions;
}

/*!
    \internal
*/
void QMdiSubWindowPrivate::ensureWindowState(Qt::WindowState state)
{
    Q_Q(QMdiSubWindow);
    Qt::WindowStates windowStates = q->windowState() | state;
    switch (state) {
    case Qt::WindowMinimized:
        windowStates &= ~Qt::WindowMaximized;
        windowStates &= ~Qt::WindowNoState;
        break;
    case Qt::WindowMaximized:
        windowStates &= ~Qt::WindowMinimized;
        windowStates &= ~Qt::WindowNoState;
        break;
    case Qt::WindowNoState:
        windowStates &= ~Qt::WindowMinimized;
        windowStates &= ~Qt::WindowMaximized;
        break;
    default:
        break;
    }
    if (baseWidget) {
        if (!(baseWidget->windowState() & Qt::WindowActive) && windowStates & Qt::WindowActive)
            baseWidget->overrideWindowState(windowStates & ~Qt::WindowActive);
        else
            baseWidget->overrideWindowState(windowStates);
    }
    q->overrideWindowState(windowStates);
}

/*!
    \internal
*/
int QMdiSubWindowPrivate::titleBarHeight(const QStyleOptionTitleBar &options) const
{
    Q_Q(const QMdiSubWindow);
    if (!q->parent() || q->windowFlags() & Qt::FramelessWindowHint
        || (q->isMaximized() && !drawTitleBarWhenMaximized())) {
        return 0;
    }

    int height = q->style()->pixelMetric(QStyle::PM_TitleBarHeight, &options);
#if defined(Q_WS_MAC) && !defined(QT_NO_STYLE_MAC)
    // ### Fix mac style, the +4 pixels hack is not necessary anymore
    if (qobject_cast<QMacStyle *>(q->style()))
        height -= 4;
#endif
    if (hasBorder(options))
        height += q->isMinimized() ? 8 : 4;
    return height;
}

/*!
    \internal
*/
void QMdiSubWindowPrivate::sizeParameters(int *margin, int *minWidth) const
{
    Q_Q(const QMdiSubWindow);
    Qt::WindowFlags flags = q->windowFlags();
    if (!q->parent() || flags & Qt::FramelessWindowHint) {
        *margin = 0;
        *minWidth = 0;
        return;
    }

    if (q->isMaximized() && !drawTitleBarWhenMaximized())
        *margin = 0;
    else
        *margin = q->style()->pixelMetric(QStyle::PM_MdiSubWindowFrameWidth);

    QStyleOptionTitleBar opt = this->titleBarOptions();
    int tempWidth = 0;
    for (int i = 0; i < NumSubControls; ++i) {
        if (SubControls[i] == QStyle::SC_TitleBarLabel) {
            tempWidth += 30;
            continue;
        }
        QRect rect = q->style()->subControlRect(QStyle::CC_TitleBar, &opt, SubControls[i], q);
        if (!rect.isValid())
            continue;
        tempWidth += rect.width();
    }
    *minWidth = tempWidth;
}

/*!
    \internal
*/
bool QMdiSubWindowPrivate::drawTitleBarWhenMaximized() const
{
    Q_Q(const QMdiSubWindow);
    if (q->window()->testAttribute(Qt::WA_CanHostQMdiSubWindowTitleBar))
        return false;
#if defined(Q_WS_MAC) && !defined(QT_NO_STYLE_MAC)
    return true;
#else
    if (q->style()->styleHint(QStyle::SH_Workspace_FillSpaceOnMaximize, 0, q))
        return true;
#if defined(QT_NO_MENUBAR) || defined(QT_NO_MAINWINDOW)
    return true;
#else
    QMainWindow *mainWindow = qobject_cast<QMainWindow *>(q->window());
    if (!mainWindow || !qobject_cast<QMenuBar *>(mainWindow->menuWidget())