qmdiarea.cpp

奇趣公司比较新的qt/emd版本

        return findMinOverlapRect(source, rects).topLeft();

    QList<QRect> maxOverlappers;
    findMaxOverlappers(domain, nonInsiders, maxOverlappers);
    return findMinOverlapRect(maxOverlappers, rects).topLeft();
}


/*!
    \internal
    Places the rectangle defined by 'size' relative to 'rects' and 'domain' so that it
    overlaps 'rects' as little as possible and 'domain' as much as possible.
    Returns the position of the resulting rectangle.
*/
QPoint MinOverlapPlacer::place(const QSize &size, const QList<QRect> &rects,
                               const QRect &domain) const
{
    if (size.isEmpty() || !domain.isValid())
        return QPoint();
    foreach (QRect rect, rects) {
        if (!rect.isValid())
            return QPoint();
    }

    QList<QRect> candidates;
    getCandidatePlacements(size, rects, domain, candidates);
    return findBestPlacement(domain, rects, candidates);
}

/*!
    \internal
*/
QMdiAreaPrivate::QMdiAreaPrivate()
    : cascader(0),
      regularTiler(0),
      iconTiler(0),
      placer(0),
      ignoreGeometryChange(false),
      ignoreWindowStateChange(false),
      isActivated(false),
      isSubWindowsTiled(false),
      showActiveWindowMaximized(false),
      tileCalledFromResizeEvent(false),
      updatesDisabledByUs(false),
      indexToNextWindow(-1),
      indexToPreviousWindow(-1),
      resizeTimerId(-1)
{
}

/*!
    \internal
*/
void QMdiAreaPrivate::_q_deactivateAllWindows(QMdiSubWindow *aboutToActivate)
{
    if (ignoreWindowStateChange)
        return;

    Q_Q(QMdiArea);
    if (!aboutToActivate)
        aboutToBecomeActive = qobject_cast<QMdiSubWindow *>(q->sender());
    else
        aboutToBecomeActive = aboutToActivate;
    Q_ASSERT(aboutToBecomeActive);

    foreach (QMdiSubWindow *child, childWindows) {
        if (!sanityCheck(child, "QMdiArea::deactivateAllWindows") || aboutToBecomeActive == child)
            continue;
        // We don't want to handle signals caused by child->showNormal().
        ignoreWindowStateChange = true;
        if(!(options & QMdiArea::DontMaximizeSubWindowOnActivation) && !showActiveWindowMaximized)
            showActiveWindowMaximized = child->isMaximized() && child->isVisible();
        if (showActiveWindowMaximized && child->isMaximized()) {
            if (q->updatesEnabled()) {
                updatesDisabledByUs = true;
                q->setUpdatesEnabled(false);
            }
            child->showNormal();
        }
        if (child->isMinimized() && !child->isShaded() && !windowStaysOnTop(child))
            child->lower();
        ignoreWindowStateChange = false;
        child->d_func()->setActive(false);
    }
}

/*!
    \internal
*/
void QMdiAreaPrivate::_q_processWindowStateChanged(Qt::WindowStates oldState,
                                                   Qt::WindowStates newState)
{
    if (ignoreWindowStateChange)
        return;

    Q_Q(QMdiArea);
    QMdiSubWindow *child = qobject_cast<QMdiSubWindow *>(q->sender());
    if (!child)
        return;

    // windowActivated
    if (!(oldState & Qt::WindowActive) && (newState & Qt::WindowActive))
        emitWindowActivated(child);
    // windowDeactivated
    else if ((oldState & Qt::WindowActive) && !(newState & Qt::WindowActive))
        resetActiveWindow(child);

    // windowMinimized
    if (!(oldState & Qt::WindowMinimized) && (newState & Qt::WindowMinimized)) {
        isSubWindowsTiled = false;
        arrangeMinimizedSubWindows();
    // windowMaximized
    } else if (!(oldState & Qt::WindowMaximized) && (newState & Qt::WindowMaximized)) {
        internalRaise(child);
    // windowRestored
    } else if (!(newState & (Qt::WindowMaximized | Qt::WindowMinimized))) {
        internalRaise(child);
        if (oldState & Qt::WindowMinimized)
            arrangeMinimizedSubWindows();
    }
}

/*!
    \internal
*/
void QMdiAreaPrivate::appendChild(QMdiSubWindow *child)
{
    Q_Q(QMdiArea);
    Q_ASSERT(child && childWindows.indexOf(child) == -1);

    if (child->parent() != q->viewport())
        child->setParent(q->viewport(), child->windowFlags());
    childWindows.append(QPointer<QMdiSubWindow>(child));

    if (!child->testAttribute(Qt::WA_Resized) && q->isVisible()) {
        QSize newSize(child->sizeHint().boundedTo(q->viewport()->size()));
        child->resize(newSize.expandedTo(child->minimumSize()));
    }

    if (!placer)
        placer = new MinOverlapPlacer;
    place(placer, child);

    if (hbarpolicy != Qt::ScrollBarAlwaysOff)
        child->setOption(QMdiSubWindow::AllowOutsideAreaHorizontally, true);
    else
        child->setOption(QMdiSubWindow::AllowOutsideAreaHorizontally, false);

    if (vbarpolicy != Qt::ScrollBarAlwaysOff)
        child->setOption(QMdiSubWindow::AllowOutsideAreaVertically, true);
    else
        child->setOption(QMdiSubWindow::AllowOutsideAreaVertically, false);

    internalRaise(child);
    indicesToStackedChildren.prepend(childWindows.size() - 1);
    Q_ASSERT(indicesToStackedChildren.size() == childWindows.size());

    if (!(child->windowFlags() & Qt::SubWindow))
        child->setWindowFlags(Qt::SubWindow);
    child->installEventFilter(q);

    QObject::connect(child, SIGNAL(aboutToActivate()), q, SLOT(_q_deactivateAllWindows()));
    QObject::connect(child, SIGNAL(windowStateChanged(Qt::WindowStates, Qt::WindowStates)),
                     q, SLOT(_q_processWindowStateChanged(Qt::WindowStates, Qt::WindowStates)));
}

/*!
    \internal
*/
void QMdiAreaPrivate::place(Placer *placer, QMdiSubWindow *child)
{
    if (!placer || !child)
        return;

    Q_Q(QMdiArea);
    if (!q->isVisible()) {
        // The window is only laid out when it's added to QMdiArea,
        // so there's no need to check that we don't have it in the
        // list already. appendChild() ensures that.
        pendingPlacements.append(child);
        return;
    }

    QList<QRect> rects;
    QRect parentRect = q->rect();
    foreach (QMdiSubWindow *window, childWindows) {
        if (!sanityCheck(window, "QMdiArea::place") || window == child || !window->isVisibleTo(q)
                || !window->testAttribute(Qt::WA_Moved)) {
            continue;
        }
        QRect occupiedGeometry;
        if (window->isMaximized()) {
            occupiedGeometry = QRect(window->d_func()->oldGeometry.topLeft(),
                                     window->d_func()->restoreSize);
        } else {
            occupiedGeometry = window->geometry();
        }
        rects.append(QStyle::visualRect(child->layoutDirection(), parentRect, occupiedGeometry));
    }
    QPoint newPos = placer->place(child->size(), rects, parentRect);
    QRect newGeometry = QRect(newPos.x(), newPos.y(), child->width(), child->height());
    child->setGeometry(QStyle::visualRect(child->layoutDirection(), parentRect, newGeometry));
}

/*!
    \internal
*/
void QMdiAreaPrivate::rearrange(Rearranger *rearranger)
{
    if (!rearranger)
        return;

    Q_Q(QMdiArea);
    if (!q->isVisible()) {
        // Compress if we already have the rearranger in the list.
        int index = pendingRearrangements.indexOf(rearranger);
        if (index != -1)
            pendingRearrangements.move(index, pendingRearrangements.size() - 1);
        else
            pendingRearrangements.append(rearranger);
        return;
    }

    QList<QWidget *> widgets;
    const bool reverseList = rearranger->type() == Rearranger::RegularTiler;
    const QList<QMdiSubWindow *> subWindows = subWindowList(QMdiArea::StackingOrder, reverseList);
    foreach (QMdiSubWindow *child, subWindows) {
        if (!sanityCheck(child, "QMdiArea::rearrange") || !child->isVisible())
            continue;
        if (rearranger->type() == Rearranger::IconTiler) {
            if (child->isMinimized() && !child->isShaded())
                widgets.append(child);
        } else {
            if (child->isMinimized() && !child->isShaded())
                continue;
            if (child->isMaximized() || child->isShaded())
                child->showNormal();
            widgets.append(child);
        }
    }

    if (active && rearranger->type() == Rearranger::RegularTiler) {
        // Move active window in front if necessary. That's the case if we
        // have any windows with staysOnTopHint set.
        int indexToActive = widgets.indexOf((QWidget *)active);
        if (indexToActive > 0)
            widgets.move(indexToActive, 0);
    }

    rearranger->rearrange(widgets, q->viewport()->rect());

    if (rearranger->type() == Rearranger::RegularTiler && !widgets.isEmpty())
        isSubWindowsTiled = true;
    else if (rearranger->type() == Rearranger::SimpleCascader)
        isSubWindowsTiled = false;
}

/*!
    \internal

    Arranges all minimized windows at the bottom of the workspace.
*/
void QMdiAreaPrivate::arrangeMinimizedSubWindows()
{
    if (!iconTiler)
        iconTiler = new IconTiler;
    rearrange(iconTiler);
}

/*!
    \internal
*/
void QMdiAreaPrivate::activateWindow(QMdiSubWindow *child)
{
    if (childWindows.isEmpty()) {
        Q_ASSERT(!child);
        Q_ASSERT(!active);
        return;
    }

    if (!child) {
        if (active) {
            Q_ASSERT(active->d_func()->isActive);
            active->d_func()->setActive(false);
            resetActiveWindow();
        }
        return;
    }

    if (child->isHidden() || child == active)
        return;
    child->d_func()->setActive(true);
}

/*!
    \internal
*/
void QMdiAreaPrivate::activateCurrentWindow()
{
    QMdiSubWindow *current = q_func()->currentSubWindow();
    if (current && !isExplicitlyDeactivated(current)) {
        current->d_func()->activationEnabled = true;
        current->d_func()->setActive(true);
    }
}

/*!
    \internal
*/
void QMdiAreaPrivate::emitWindowActivated(QMdiSubWindow *activeWindow)
{
    Q_Q(QMdiArea);
    Q_ASSERT(activeWindow);
    if (activeWindow == active)
        return;
    Q_ASSERT(activeWindow->d_func()->isActive);

    if (!aboutToBecomeActive)
        _q_deactivateAllWindows(activeWindow);
    Q_ASSERT(aboutToBecomeActive);

    // This is true only if 'DontMaximizeSubWindowOnActivation' is disabled
    // and the previous active window was maximized.
    if (showActiveWindowMaximized) {
        if (!activeWindow->isMaximized())
            activeWindow->showMaximized();
        showActiveWindowMaximized = false;
    }

    int indexToActiveWindow = childWindows.indexOf(activeWindow);
    Q_ASSERT(indexToActiveWindow != -1);
    setIndex(&indexToNextWindow, indexToActiveWindow + 1, 0, childWindows.size() - 1 , true);
    setIndex(&indexToPreviousWindow, indexToActiveWindow - 1, 0, childWindows.size() - 1, false);

    // Put in front to update stacking order
    int index = indicesToStackedChildren.indexOf(indexToActiveWindow);
    Q_ASSERT(index != -1);
    indicesToStackedChildren.move(index, 0);
    internalRaise(activeWindow);

    if (updatesDisabledByUs) {
        q->setUpdatesEnabled(true);
        updatesDisabledByUs = false;
    }

    Q_ASSERT(aboutToBecomeActive == activeWindow);
    active = activeWindow;
    aboutToBecomeActive = 0;
    Q_ASSERT(active->d_func()->isActive);

    if (active->isMaximized() && scrollBarsEnabled())
        updateScrollBars();

    emit q->subWindowActivated(active);
}

/*!
    \internal
*/
void QMdiAreaPrivate::resetActiveWindow(QMdiSubWindow *deactivatedWindow)
{
    Q_Q(QMdiArea);
    if (deactivatedWindow) {
        if (deactivatedWindow != active)
            return;
        active = 0;
        if ((aboutToBecomeActive || isActivated || lastWindowAboutToBeDestroyed())
            && !isExplicitlyDeactivated(deactivatedWindow) && !q->window()->isMinimized()) {
            return;
        }
        emit q->subWindowActivated(0);
        return;
    }

    if (aboutToBecomeActive)
        return;

    active = 0;
    emit q->subWindowActivated(0);
}

/*!
    \internal
*/
void QMdiAreaPrivate::updateActiveWindow(int removedIndex)
{
    Q_ASSERT(indicesToStackedChildren.size() == childWindows.size());
    if (childWindows.isEmpty()) {
        indexToNextWindow = -1;
        indexToPreviousWindow = -1;
        showActiveWindowMaximized = false;
        resetActiveWindow();
        return;
    }

    // Update indices list
    for (int i = 0; i < indicesToStackedChildren.size(); ++i) {
        int *index = &indicesToStackedChildren[i];
        if (*index > removedIndex)
            --*index;
    }

    // This is -1 only if there's no active window
    if (indexToNextWindow == -1) {
        Q_ASSERT(!active);
        return;
    }

    // Check if active window was removed
    if (indexToNextWindow - 1 == removedIndex) {
        activateWindow(childWindows.at(removedIndex));
    } else if (indexToNextWindow == 0 && removedIndex == childWindows.size()) {
        activateWindow(childWindows.at(0));
    // Active window is still in charge, update next and previous indices
    // if necessary.
    } else if (indexToNextWindow > removedIndex) {
        int nextCandidate = indexToNextWindow - 1;
        int prevCandidate = indexToPreviousWindow;
        if (indexToPreviousWindow >= removedIndex)
            --prevCandidate;
        setIndex(&indexToNextWindow, nextCandidate, 0, childWindows.size(), true);
        setIndex(&indexToPreviousWindow, prevCandidate, 0, childWindows.size(), false);
    }
}

/*!
    \internal
*/
void QMdiAreaPrivate::updateScrollBars()
{
    if (ignoreGeometryChange || !scrollBarsEnabled())
        return;

    Q_Q(QMdiArea);
    QSize maxSize = q->maximumViewportSize();
    QSize hbarExtent = hbar->sizeHint();
    QSize vbarExtent = vbar->sizeHint();

    if (q->style()->styleHint(QStyle::SH_ScrollView_FrameOnlyAroundContents, 0, q)) {
        const int doubleFrameWidth = frameWidth * 2;
        if (hbarpolicy == Qt::ScrollBarAlwaysOn)
            maxSize.rheight() -= doubleFrameWidth;
        if (vbarpolicy == Qt::ScrollBarAlwaysOn)
            maxSize.rwidth() -= doubleFrameWidth;
        hbarExtent.rheight() += doubleFrameWidth;
        vbarExtent.rwidth() += doubleFrameWidth;
    }

    const QRect childrenRect = active && active->isMaximized()
                               ? active->geometry() : viewport->childrenRect();