qmenu.cpp

奇趣公司比较新的qt/emd版本

            if (QMenu *m = qobject_cast<QMenu*>(caused)) {
                caused = m->d_func()->causedPopup.widget;
                if (!m->d_func()->tornoff)
                    m->hide();
                m->d_func()->setCurrentAction(0);
            } else {
#ifndef QT_NO_TOOLBUTTON
                if (qobject_cast<QToolButton*>(caused) == 0)
#endif
                    qWarning("QMenu: Internal error");
                caused = 0;
            }
        }
    }
    setCurrentAction(0);
}

void QMenuPrivate::popupAction(QAction *action, int delay, bool activateFirst)
{
    Q_Q(QMenu);
    if (action && action->isEnabled()) {
        if (!delay)
            q->internalDelayedPopup();
        else
            QMenuPrivate::menuDelayTimer.start(delay, q);
        if (activateFirst && action->menu())
            action->menu()->d_func()->setFirstActionActive();
    } else if (QMenu *menu = activeMenu) {  //hide the current item
        activeMenu = 0;
        menu->hide();
    }
}

void QMenuPrivate::setSyncAction()
{
    Q_Q(QMenu);
    QAction *current = currentAction;
    if(current && (!current->isEnabled() || current->menu() || current->isSeparator()))
        current = 0;
    for(QWidget *caused = q; caused;) {
        if (QMenu *m = qobject_cast<QMenu*>(caused)) {
            caused = m->d_func()->causedPopup.widget;
            if (m->d_func()->eventLoop)
                m->d_func()->syncAction = current; // synchronous operation
        } else {
            break;
        }
    }
}


void QMenuPrivate::setFirstActionActive()
{
    Q_Q(QMenu);
    const int scrollerHeight = q->style()->pixelMetric(QStyle::PM_MenuScrollerHeight, 0, q);
    for(int i = 0, saccum = 0; i < actionList.count(); i++) {
        QAction *act = actionList[i];
        if (scroll && scroll->scrollFlags & QMenuScroller::ScrollUp) {
            saccum -= actionRects.value(act).height();
            if (saccum > scroll->scrollOffset-scrollerHeight)
                continue;
        }
        if (!act->isSeparator() &&
           (q->style()->styleHint(QStyle::SH_Menu_AllowActiveAndDisabled, 0, q)
            || act->isEnabled())) {
            setCurrentAction(act);
            break;
        }
    }
}

// popup == -1 means do not popup, 0 means immediately, others mean use a timer
void QMenuPrivate::setCurrentAction(QAction *action, int popup, SelectionReason reason, bool activateFirst)
{
    Q_Q(QMenu);
    tearoffHighlighted = 0;
    if (action == currentAction && !(action && action->menu() && action->menu() != activeMenu)) {
        if(QMenu *menu = qobject_cast<QMenu*>(causedPopup.widget)) {
            if(causedPopup.action && menu->d_func()->activeMenu == q)
                menu->d_func()->setCurrentAction(causedPopup.action, 0, reason, false);
        }
        return;
    }
    if (currentAction)
        q->update(actionRect(currentAction));

    sloppyAction = 0;
    if (!sloppyRegion.isEmpty())
        sloppyRegion = QRegion();
    QMenu *hideActiveMenu = activeMenu;
#ifndef QT_NO_STATUSTIP
    QAction *previousAction = currentAction;
#endif
    currentAction = action;
    if (action) {
        if (!action->isSeparator()) {
            activateAction(action, QAction::Hover);
            if (popup != -1) {
                hideActiveMenu = 0; //will be done "later"
                popupAction(currentAction, popup, activateFirst);
            }
            q->update(actionRect(action));
            QWidget *widget = widgetItems.value(action);

            if (reason == SelectedFromKeyboard) {
                if (widget) {
                    if (widget->focusPolicy() != Qt::NoFocus)
                        widget->setFocus(Qt::TabFocusReason);
                } else {
                    //when the action has no QWidget, the QMenu itself should
                    // get the focus
                    // Since the menu is a pop-up, it uses the popup reason.
                    q->setFocus(Qt::PopupFocusReason);
                }
            }
        } else { //action is a separator
            if (popup != -1)
                hideActiveMenu = 0; //will be done "later"
        }
#ifndef QT_NO_STATUSTIP
    }  else if (previousAction) {
        QWidget *w = causedPopup.widget;
        while (QMenu *m = qobject_cast<QMenu*>(w))
            w = m->d_func()->causedPopup.widget;
        if (w) {
            QString empty;
            QStatusTipEvent tip(empty);
            QApplication::sendEvent(w, &tip);
        }
#endif
    }
    if (hideActiveMenu) {
        activeMenu = 0;
#ifndef QT_NO_EFFECTS
        // kill any running effect
        qFadeEffect(0);
        qScrollEffect(0);
#endif
        hideActiveMenu->hide();
    }
}

QAction *QMenuPrivate::actionAt(QPoint p) const
{
    if (!q_func()->rect().contains(p))     //sanity check
       return 0;

    for(int i = 0; i < actionList.count(); i++) {
        QAction *act = actionList[i];
        if (actionRect(act).contains(p))
            return act;
    }
    return 0;
}

void QMenuPrivate::setOverrideMenuAction(QAction *a)
{
    Q_Q(QMenu);
    QObject::disconnect(menuAction, SIGNAL(destroyed()), q, SLOT(_q_overrideMenuActionDestroyed()));
    if (a) {
        menuAction = a;
        QObject::connect(a, SIGNAL(destroyed()), q, SLOT(_q_overrideMenuActionDestroyed()));
    } else { //we revert back to the default action created by the QMenu itself
        menuAction = defaultMenuAction;
    }
}

void QMenuPrivate::_q_overrideMenuActionDestroyed()
{
    menuAction=defaultMenuAction;
}

/*!
    Returns the action associated with this menu.
*/
QAction *QMenu::menuAction() const
{
    return d_func()->menuAction;
}

/*!
  \property QMenu::title

  \brief The title of the menu

  This is equivalent to the QAction::text property of the menuAction().
*/
QString QMenu::title() const
{
    return d_func()->menuAction->text();
}

void QMenu::setTitle(const QString &text)
{
    d_func()->menuAction->setText(text);
}

/*!
  \property QMenu::icon

  \brief The icon of the menu

  This is equivalent to the QAction::icon property of the menuAction().
*/
QIcon QMenu::icon() const
{
    return d_func()->menuAction->icon();
}

void QMenu::setIcon(const QIcon &icon)
{
    d_func()->menuAction->setIcon(icon);
}


//actually performs the scrolling
void QMenuPrivate::scrollMenu(QAction *action, QMenuScroller::ScrollLocation location, bool active)
{
    Q_Q(QMenu);
    if (!scroll || !scroll->scrollFlags)
        return;
    int newOffset = 0;
    const int scrollHeight = q->style()->pixelMetric(QStyle::PM_MenuScrollerHeight, 0, q);
    const int topScroll = (scroll->scrollFlags & QMenuScroller::ScrollUp)   ? scrollHeight : 0;
    const int botScroll = (scroll->scrollFlags & QMenuScroller::ScrollDown) ? scrollHeight : 0;
    const int vmargin = q->style()->pixelMetric(QStyle::PM_MenuVMargin, 0, q);

    if (location == QMenuScroller::ScrollTop) {
        for(int i = 0, saccum = 0; i < actionList.count(); i++) {
            QAction *act = actionList.at(i);
            if (act == action) {
                newOffset = topScroll - saccum;
                break;
            }
            saccum += actionRects.value(act).height();
        }
    } else {
        for(int i = 0, saccum = 0; i < actionList.count(); i++) {
            QAction *act = actionList.at(i);
            saccum += actionRects.value(act).height();
            if (act == action) {
                if (location == QMenuScroller::ScrollCenter)
                    newOffset = ((q->height() / 2) - botScroll) - (saccum - topScroll);
                else
                    newOffset = (q->height() - botScroll) - (saccum - topScroll);
                break;
            }
        }
        if(newOffset)
            newOffset -= vmargin*2;
    }

    //figure out which scroll flags
    uint newScrollFlags = QMenuScroller::ScrollNone;
    if (newOffset < 0) //easy and cheap one
        newScrollFlags |= QMenuScroller::ScrollUp;
    for(int i = 0, saccum=newOffset; i < actionList.count(); i++) {
        saccum += actionRects.value(actionList.at(i)).height();
        if (saccum > q->height()) {
            newScrollFlags |= QMenuScroller::ScrollDown;
            break;
        }
    }

    if (location == QMenuScroller::ScrollTop && ((newScrollFlags & QMenuScroller::ScrollUp)
                                                 || !(scroll->scrollFlags & QMenuScroller::ScrollUp)))
        newOffset += scrollHeight;
    else if (location == QMenuScroller::ScrollBottom && ((newScrollFlags & QMenuScroller::ScrollDown)
                                                           || !(scroll->scrollFlags & QMenuScroller::ScrollDown)))
        newOffset -= scrollHeight;

    QRect screen = popupGeometry(QApplication::desktop()->screenNumber(q));
    const int desktopFrame = q->style()->pixelMetric(QStyle::PM_MenuDesktopFrameWidth, 0, q);
    if (q->height() < screen.height()-(desktopFrame*2)-1) {
        QRect geom = q->geometry();
        if (newOffset > scroll->scrollOffset && (scroll->scrollFlags & newScrollFlags & QMenuScroller::ScrollUp)) { //scroll up
            const int newHeight = geom.height()-(newOffset-scroll->scrollOffset);
            if(newHeight > geom.height())
                geom.setHeight(newHeight);
        } else if(scroll->scrollFlags & newScrollFlags & QMenuScroller::ScrollDown) {
            int newTop = geom.top() + (newOffset-scroll->scrollOffset);
            if (newTop < desktopFrame+screen.top())
                newTop = desktopFrame+screen.top();
            if (newTop < geom.top()) {
                geom.setTop(newTop);
                newOffset = 0;
                newScrollFlags &= ~QMenuScroller::ScrollUp;
            }
        }
        if (geom.bottom() > screen.bottom() - desktopFrame)
            geom.setBottom(screen.bottom() - desktopFrame);
        if (geom.top() < desktopFrame+screen.top())
            geom.setTop(desktopFrame+screen.top());
        if (geom != q->geometry()) {
#if 0
            if (newScrollFlags & QMenuScroller::ScrollDown &&
               q->geometry().top() - geom.top() >= -newOffset)
                newScrollFlags &= ~QMenuScroller::ScrollDown;
#endif
            q->setGeometry(geom);
        }
    }

    //actually update flags
    scroll->scrollOffset = newOffset;
    if (scroll->scrollOffset > 0)
        scroll->scrollOffset = 0;
    scroll->scrollFlags = newScrollFlags;
    if (active)
        setCurrentAction(action);

    q->update();     //issue an update so we see all the new state..
}

void QMenuPrivate::scrollMenu(QMenuScroller::ScrollLocation location, bool active)
{
    Q_Q(QMenu);
    if(location == QMenuScroller::ScrollBottom) {
        for(int i = actionList.size()-1; i >= 0; --i) {
            QAction *act = actionList.at(i);
            if (!act->isSeparator() &&
                (q->style()->styleHint(QStyle::SH_Menu_AllowActiveAndDisabled, 0, q)
                 || act->isEnabled())) {
                if(scroll->scrollFlags & QMenuPrivate::QMenuScroller::ScrollDown)
                    scrollMenu(act, QMenuPrivate::QMenuScroller::ScrollBottom, active);
                else if(active)
                    setCurrentAction(act, /*popup*/-1, QMenuPrivate::SelectedFromKeyboard);
                break;
            }
        }
    } else if(location == QMenuScroller::ScrollTop) {
        for(int i = 0; i < actionList.size(); ++i) {
            QAction *act = actionList.at(i);
            if (!act->isSeparator() &&
                (q->style()->styleHint(QStyle::SH_Menu_AllowActiveAndDisabled, 0, q)
                 || act->isEnabled())) {
                if(scroll->scrollFlags & QMenuPrivate::QMenuScroller::ScrollUp)
                    scrollMenu(act, QMenuPrivate::QMenuScroller::ScrollTop, active);
                else if(active)
                    setCurrentAction(act, /*popup*/-1, QMenuPrivate::SelectedFromKeyboard);
                break;
            }
        }
    }
}

//only directional
void QMenuPrivate::scrollMenu(QMenuScroller::ScrollDirection direction, bool page, bool active)
{
    Q_Q(QMenu);
    if (!scroll || !(scroll->scrollFlags & direction)) //not really possible...
        return;
    const int scrollHeight = q->style()->pixelMetric(QStyle::PM_MenuScrollerHeight, 0, q);
    const int topScroll = (scroll->scrollFlags & QMenuScroller::ScrollUp)   ? scrollHeight : 0;
    const int botScroll = (scroll->scrollFlags & QMenuScroller::ScrollDown) ? scrollHeight : 0;
    if (direction == QMenuScroller::ScrollUp) {
        for(int i = 0, saccum = 0; i < actionList.count(); i++) {
            QAction *act = actionList.at(i);
            const int iHeight = actionRects.value(act).height();
            saccum -= iHeight;
            if (saccum <= scroll->scrollOffset-topScroll) {
                scrollMenu(act, page ? QMenuScroller::ScrollBottom : QMenuScroller::ScrollTop, active);
                break;
            }
        }
    } else if (direction == QMenuScroller::ScrollDown) {
        bool scrolled = false;
        for(int i = 0, saccum = topScroll; i < actionList.count(); i++) { // saccum = topScroll
            QAction *act = actionList.at(i);
            const int iHeight = actionRects.value(act).height();
            saccum -= iHeight;
            if (saccum <= scroll->scrollOffset-topScroll) {
                const int scrollerArea = q->height() - botScroll;
                int visible = -(((scroll->scrollOffset-topScroll) - saccum) - iHeight);
                for(i++ ; i < actionList.count(); i++) {
                    act = actionList.at(i);
                    const int iHeight = actionRects.value(act).height();
                    visible += iHeight;
                    if (visible > scrollerArea-topScroll) {
                        scrolled = true;
                        scrollMenu(act, page ? QMenuScroller::ScrollTop : QMenuScroller::ScrollBottom, active);
                        break;
                    }
                }
                break;
            }
        }
        if(!scrolled) {
            scroll->scrollFlags &= ~QMenuScroller::ScrollDown;
            q->update();
        }
    }
}