qmenu.cpp

qt-x11-opensource-src-4.1.4.tar.gz源码

    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);
    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;
                else
                    newOffset = (q->height() - botScroll) - saccum;
                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+topScroll; 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 = QApplication::desktop()->availableGeometry(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
            geom.setHeight(geom.height()-(newOffset-scroll->scrollOffset));
        } else if(scroll->scrollFlags & newScrollFlags & QMenuScroller::ScrollDown) {
            geom.setTop(geom.top() + (newOffset-scroll->scrollOffset));
            if (geom != q->geometry()) {
                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..
}

//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) {
        for(int i = 0, saccum = 0; i < actionList.count(); i++) {
            QAction *act = actionList.at(i);
            const int iHeight = actionRects.value(act).height();
            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) {
                        scrollMenu(act, page ? QMenuScroller::ScrollTop : QMenuScroller::ScrollBottom, active);
                        break;
                    }
                }
                break;
            }
            saccum -= iHeight;
        }
    }
}

/* This is poor-mans eventfilters. This avoids the use of
   eventFilter (which can be nasty for users of QMenuBar's). */
bool QMenuPrivate::mouseEventTaken(QMouseEvent *e)
{
    Q_Q(QMenu);
    QPoint pos = q->mapFromGlobal(e->globalPos());
    if (scroll && !activeMenu) { //let the scroller "steal" the event
        bool isScroll = false;
        if (pos.x() >= 0 && pos.x() < q->width()) {
            const int scrollerHeight = q->style()->pixelMetric(QStyle::PM_MenuScrollerHeight, 0, q);
            for(int dir = QMenuScroller::ScrollUp; dir <= QMenuScroller::ScrollDown; dir = dir << 1) {
                if (scroll->scrollFlags & dir) {
                    if (dir == QMenuScroller::ScrollUp)
                        isScroll = (pos.y() <= scrollerHeight);
                    else if (dir == QMenuScroller::ScrollDown)
                        isScroll = (pos.y() >= q->height()-scrollerHeight);
                    if (isScroll) {
                        scroll->scrollDirection = dir;
                        break;
                    }
                }
            }
        }
        if (isScroll) {
            if (!scroll->scrollTimer)
                scroll->scrollTimer = new QBasicTimer;
            scroll->scrollTimer->start(50, q);
            return true;
        } else if (scroll->scrollTimer && scroll->scrollTimer->isActive()) {
            scroll->scrollTimer->stop();
        }
    }

    if (tearoff) { //let the tear off thingie "steal" the event..
        QRect tearRect(0, 0, q->width(), q->style()->pixelMetric(QStyle::PM_MenuTearoffHeight, 0, q));
        if (scroll && scroll->scrollFlags & QMenuPrivate::QMenuScroller::ScrollUp)
            tearRect.translate(0, q->style()->pixelMetric(QStyle::PM_MenuScrollerHeight, 0, q));
        q->update(tearRect);
        if (tearRect.contains(pos)) {
            setCurrentAction(0);
            tearoffHighlighted = 1;
            if (e->type() == QEvent::MouseButtonRelease) {
                if (tornPopup) {
                    tornPopup->close();
                } else {
                    tornPopup = new QTornOffMenu(q);
                    tornPopup->setGeometry(q->geometry());
                    tornPopup->show();
                }
                hideUpToMenuBar();
            }
            return true;
        }
        tearoffHighlighted = 0;
    }

    if (q->frameGeometry().contains(e->globalPos())) //otherwise if the event is in our rect we want it..
        return false;

    for(QWidget *caused = causedPopup.widget; caused;) {
        bool passOnEvent = false;
        QWidget *next_widget = 0;
        QPoint cpos = caused->mapFromGlobal(e->globalPos());
#ifndef QT_NO_MENUBAR
        if (QMenuBar *mb = qobject_cast<QMenuBar*>(caused)) {
            passOnEvent = mb->rect().contains(cpos);
        } else
#endif
        if (QMenu *m = qobject_cast<QMenu*>(caused)) {
            passOnEvent = m->d_func()->actionAt(cpos);
            next_widget = m->d_func()->causedPopup.widget;
        }
        if (passOnEvent) {
            QMouseEvent new_e(e->type(), cpos, e->button(), e->buttons(), e->modifiers());
            QApplication::sendEvent(caused, &new_e);
            return true;
        }
        if (!next_widget)
            break;
        caused = next_widget;
    }
    return false;
}

void QMenuPrivate::activateAction(QAction *action, QAction::ActionEvent action_e)
{
    Q_Q(QMenu);
#ifndef QT_NO_WHATSTHIS
    bool inWhatsThisMode = QWhatsThis::inWhatsThisMode();
#endif
    if (!action || !q->isEnabled()
        || (action_e == QAction::Trigger
#ifndef QT_NO_WHATSTHIS
            && !inWhatsThisMode
#endif
            && (action->isSeparator() ||!action->isEnabled())))
        return;

    /* I have to save the caused stack here because it will be undone after popup execution (ie in the hide).
       Then I iterate over the list to actually send the events. --Sam
    */
    QList<QPointer<QWidget> > causedStack;
    for(QWidget *widget = causedPopup.widget; widget; ) {
        causedStack.append(widget);
        if (QMenu *qmenu = ::qobject_cast<QMenu*>(widget))
            widget = qmenu->d_func()->causedPopup.widget;
        else
            break;
    }
    if (action_e == QAction::Trigger) {
        hideUpToMenuBar();
#ifndef QT_NO_WHATSTHIS
        if (inWhatsThisMode) {
            QString s = action->whatsThis();
            if (s.isEmpty())
                s = whatsThis;
            QWhatsThis::showText(q->mapToGlobal(actionRect(action).center()), s, q);
            return;
        }
#endif
    }

    action->activate(action_e);

    for(int i = 0; i < causedStack.size(); ++i) {
        QPointer<QWidget> widget = causedStack.at(i);
        if (!widget)
            continue;
        //fire
        if (QMenu *qmenu = ::qobject_cast<QMenu*>(widget)) {
            widget = qmenu->d_func()->causedPopup.widget;
            if (action_e == QAction::Trigger) {
                emit qmenu->triggered(action);
#ifdef QT3_SUPPORT
                emit qmenu->activated(qmenu->findIdForAction(action));
#endif
            } else if (action_e == QAction::Hover) {
                emit qmenu->hovered(action);
#ifdef QT3_SUPPORT
                emit qmenu->highlighted(qmenu->findIdForAction(action));
#endif
            }
#ifndef QT_NO_MENUBAR
        } else if (QMenuBar *qmenubar = ::qobject_cast<QMenuBar*>(widget)) {
            if (action_e == QAction::Trigger) {
                emit qmenubar->triggered(action);
#ifdef QT3_SUPPORT
                emit qmenubar->activated(qmenubar->findIdForAction(action));
#endif
            } else if (action_e == QAction::Hover) {
                emit qmenubar->hovered(action);
#ifdef QT3_SUPPORT
                emit qmenubar->highlighted(qmenubar->findIdForAction(action));
#endif
            }
            break; //nothing more..
#endif
        }
    }

    if (action_e == QAction::Hover) {
#ifndef QT_NO_ACCESSIBILITY
        int actionID = indexOf(action);
        QAccessible::updateAccessibility(q, actionID, QAccessible::Focus);
        QAccessible::updateAccessibility(q, actionID, QAccessible::Selection);
#endif
        QWidget *w = causedPopup.widget;
        while (QMenu *m = qobject_cast<QMenu*>(w))
            w = m->d_func()->causedPopup.widget;
        action->showStatusText(w);
    }
}

void QMenuPrivate::_q_actionTriggered()
{
    Q_Q(QMenu);
    if (QAction *action = qobject_cast<QAction *>(q->sender())) {
        emit q->triggered(action);
#ifdef QT3_SUPPORT
        emit q->activated(q->findIdForAction(action));
#endif
    }
}

void QMenuPrivate::_q_actionHovered()
{
    Q_Q(QMenu);
    if (QAction *action = qobject_cast<QAction *>(q->sender())) {
        emit q->hovered(action);
#ifdef QT3_SUPPORT
        emit q->highlighted(q->findIdForAction(action));
#endif
    }
}

QStyleOptionMenuItem QMenuPrivate::getStyleOption(const QAction *action) const
{
    Q_Q(const QMenu);
    QStyleOptionMenuItem opt;
    opt.initFrom(q);
    opt.palette = q->palette();
    opt.state = QStyle::State_None;

    if (q->window()->isActiveWindow())
        opt.state |= QStyle::State_Active;
    if (q->isEnabled() && action->isEnabled()
            && (!action->menu() || action->menu()->isEnabled()))
        opt.state |= QStyle::State_Enabled;
    else
        opt.palette.setCurrentColorGroup(QPalette::Disabled);

    opt.font = action->font();

    if (currentAction && currentAction == action && !currentAction->isSeparator()) {
        opt.state |= QStyle::State_Selected
                     | (mouseDown ? QStyle::State_Sunken : QStyle::State_None);
    }

    opt.menuHasCheckableItems = hasCheckableItems;
    if (!action->isCheckable()) {
        opt.checkType = QStyleOptionMenuItem::NotCheckable;
    } else {
        opt.checkType = (action->actionGroup() && action->actionGroup()->isExclusive())
                            ? QStyleOptionMenuItem::Exclusive : QStyleOptionMenuItem::NonExclusive;
        opt.checked = action->isChecked();
    }
    if (action->menu())
        opt.menuItemType = QStyleOptionMenuItem::SubMenu;
    else if (action->isSeparator())
        opt.menuItemType = QStyleOptionMenuItem::Separator;
    else if (defaultAction == action)
	    opt.menuItemType = QStyleOptionMenuItem::DefaultItem;
    else