qmenu.cpp

qt-x11-opensource-src-4.1.4.tar.gz源码

    if (d->eventLoop)
        d->eventLoop->exit();
    d->setCurrentAction(0);
#ifndef QT_NO_ACCESSIBILITY
    QAccessible::updateAccessibility(this, 0, QAccessible::PopupMenuEnd);
#endif
#ifndef QT_NO_MENUBAR
    if (QMenuBar *mb = qobject_cast<QMenuBar*>(d->causedPopup.widget))
        mb->d_func()->setCurrentAction(0);
#endif
    d->mouseDown = false;
    d->hasHadMouse = false;
    d->causedPopup.widget = 0;
    d->causedPopup.action = 0;
}

/*!
  \reimp
*/
void QMenu::paintEvent(QPaintEvent *e)
{
    Q_D(QMenu);
    QPainter p(this);
    QRegion emptyArea = QRegion(rect());

    //draw the items that need updating..
    for (int i = 0; i < d->actionList.count(); ++i) {
        QAction *action = d->actionList.at(i);
        QRect adjustedActionRect = d->actionRect(action);
        if (!e->rect().intersects(adjustedActionRect))
           continue;
        //set the clip region to be extra safe (and adjust for the scrollers)
        QRegion adjustedActionReg(adjustedActionRect);
        emptyArea -= adjustedActionReg;
        p.setClipRegion(adjustedActionReg);

        QStyleOptionMenuItem opt = d->getStyleOption(action);
        opt.rect = adjustedActionRect;
        style()->drawControl(QStyle::CE_MenuItem, &opt, &p, this);
    }

    const int fw = style()->pixelMetric(QStyle::PM_MenuPanelWidth, 0, this);
    QStyleOptionMenuItem menuOpt;
    menuOpt.initFrom(this);
    menuOpt.palette = palette();
    menuOpt.state = QStyle::State_None;
    menuOpt.checkType = QStyleOptionMenuItem::NotCheckable;
    menuOpt.menuRect = rect();
    menuOpt.maxIconWidth = 0;
    menuOpt.tabWidth = 0;
    //draw the scroller regions..
    if (d->scroll) {
        const int scrollerHeight = style()->pixelMetric(QStyle::PM_MenuScrollerHeight, 0, this);
        menuOpt.menuItemType = QStyleOptionMenuItem::Scroller;
        menuOpt.state |= QStyle::State_Enabled;
        if (d->scroll->scrollFlags & QMenuPrivate::QMenuScroller::ScrollUp) {
            menuOpt.rect.setRect(fw, fw, width() - (fw * 2), scrollerHeight);
            emptyArea -= QRegion(menuOpt.rect);
            p.setClipRect(menuOpt.rect);
            style()->drawControl(QStyle::CE_MenuScroller, &menuOpt, &p, this);
        }
        if (d->scroll->scrollFlags & QMenuPrivate::QMenuScroller::ScrollDown) {
            menuOpt.rect.setRect(fw, height() - scrollerHeight - fw, width() - (fw * 2),
                                     scrollerHeight);
            emptyArea -= QRegion(menuOpt.rect);
            menuOpt.state |= QStyle::State_DownArrow;
            p.setClipRect(menuOpt.rect);
            style()->drawControl(QStyle::CE_MenuScroller, &menuOpt, &p, this);
        }
    }
    //paint the tear off..
    if (d->tearoff) {
        menuOpt.menuItemType = QStyleOptionMenuItem::TearOff;
        menuOpt.rect.setRect(fw, fw, width() - (fw * 2),
                             style()->pixelMetric(QStyle::PM_MenuTearoffHeight, 0, this));
        if (d->scroll && d->scroll->scrollFlags & QMenuPrivate::QMenuScroller::ScrollUp)
            menuOpt.rect.translate(0, style()->pixelMetric(QStyle::PM_MenuScrollerHeight, 0, this));
        emptyArea -= QRegion(menuOpt.rect);
        p.setClipRect(menuOpt.rect);
        menuOpt.state = QStyle::State_None;
        if (d->tearoffHighlighted)
            menuOpt.state |= QStyle::State_Selected;
        style()->drawControl(QStyle::CE_MenuTearoff, &menuOpt, &p, this);
    }
    //draw border
    if (fw) {
        QRegion borderReg;
        borderReg += QRect(0, 0, fw, height()); //left
        borderReg += QRect(width()-fw, 0, fw, height()); //right
        borderReg += QRect(0, 0, width(), fw); //top
        borderReg += QRect(0, height()-fw, width(), fw); //bottom
        p.setClipRegion(borderReg);
        emptyArea -= borderReg;
        QStyleOptionFrame frame;
        frame.rect = rect();
        frame.palette = palette();
        frame.state = QStyle::State_None;
        frame.lineWidth = style()->pixelMetric(QStyle::PM_DefaultFrameWidth);
        frame.midLineWidth = 0;
        style()->drawPrimitive(QStyle::PE_FrameMenu, &frame, &p, this);
    }

    //finally the rest of the space
    p.setClipRegion(emptyArea);
    menuOpt.state = QStyle::State_None;
    menuOpt.menuItemType = QStyleOptionMenuItem::EmptyArea;
    menuOpt.checkType = QStyleOptionMenuItem::NotCheckable;
    menuOpt.rect = rect();
    menuOpt.menuRect = rect();
    style()->drawControl(QStyle::CE_MenuEmptyArea, &menuOpt, &p, this);
}

#ifndef QT_NO_WHEELEVENT
/*!
  \reimp
*/
void QMenu::wheelEvent(QWheelEvent *e)
{
    Q_D(QMenu);
    if (d->scroll && rect().contains(e->pos()))
        d->scrollMenu(e->delta() > 0 ?
                      QMenuPrivate::QMenuScroller::ScrollUp : QMenuPrivate::QMenuScroller::ScrollDown);
}
#endif

/*!
  \reimp
*/
void QMenu::mousePressEvent(QMouseEvent *e)
{
    Q_D(QMenu);
    if (d->mouseEventTaken(e))
        return;
    if (!rect().contains(e->pos())) {
         if (d->noReplayFor
             && QRect(d->noReplayFor->mapToGlobal(QPoint()), d->noReplayFor->size()).contains(e->globalPos()))
             setAttribute(Qt::WA_NoMouseReplay);
         if (d->eventLoop) // synchronous operation
             d->syncAction = 0;
        d->hideUpToMenuBar();
        return;
    }
    d->mouseDown = true;

    QAction *action = d->actionAt(e->pos());
    d->setCurrentAction(action, 20);
    update();
}

/*!
  \reimp
*/
void QMenu::mouseReleaseEvent(QMouseEvent *e)
{
    Q_D(QMenu);
    if (d->mouseEventTaken(e))
        return;

    d->mouseDown = false;
    QAction *action = d->actionAt(e->pos());
    for(QWidget *caused = this; caused;) {
        if (QMenu *m = qobject_cast<QMenu*>(caused)) {
            caused = m->d_func()->causedPopup.widget;
            if (m->d_func()->eventLoop) // synchronous operation
                m->d_func()->syncAction = d->currentAction;
        } else {
            break;
        }
    }
    if (action && action == d->currentAction) {
        if (action->menu())
            action->menu()->d_func()->setFirstActionActive();
        else
            d->activateAction(action, QAction::Trigger);
    } else if (d->motions > 6) {
        d->hideUpToMenuBar();
    }
}

/*!
  \reimp
*/
void QMenu::changeEvent(QEvent *e)
{
    Q_D(QMenu);
    if (e->type() == QEvent::StyleChange || e->type() == QEvent::FontChange ||
        e->type() == QEvent::LayoutDirectionChange) {
        d->itemsDirty = 1;
        setMouseTracking(style()->styleHint(QStyle::SH_Menu_MouseTracking, 0, this));
        if (isVisible())
            resize(sizeHint());
        if (!style()->styleHint(QStyle::SH_Menu_Scrollable, 0, this)) {
            delete d->scroll;
            d->scroll = 0;
        } else if (!d->scroll) {
            d->scroll = new QMenuPrivate::QMenuScroller;
            d->scroll->scrollFlags = QMenuPrivate::QMenuScroller::ScrollNone;
        }
    } else if (e->type() == QEvent::EnabledChange) {
        if (d->tornPopup) // torn-off menu
            d->tornPopup->setEnabled(isEnabled());
        d->menuAction->setEnabled(isEnabled());
    }
    QWidget::changeEvent(e);
}


/*!
  \reimp
*/
bool
QMenu::event(QEvent *e)
{
    Q_D(QMenu);
    switch (e->type()) {
    case QEvent::KeyPress: {
        QKeyEvent *ke = (QKeyEvent*)e;
        if (ke->key() == Qt::Key_Tab || ke->key() == Qt::Key_Backtab) {
            keyPressEvent(ke);
            return true;
        }
    } break;
    case QEvent::Resize:
        d->itemsDirty = 1;
        d->updateActions();
        break;
    case QEvent::Show:
        d->updateActions();
        break;
#ifndef QT_NO_WHATSTHIS
    case QEvent::QueryWhatsThis:
        e->setAccepted(d->whatsThis.size());
        if (QAction *action = d->actionAt(static_cast<QHelpEvent*>(e)->pos())) {
            if (action->whatsThis().size() || action->menu())
                e->accept();
        }
        return true;
#endif
    default:
        break;
    }
    return QWidget::event(e);
}

/*!
  \reimp
*/
void QMenu::keyPressEvent(QKeyEvent *e)
{
    Q_D(QMenu);
    int key = e->key();
    if (isRightToLeft()) {  // in reverse mode open/close key for submenues are reversed
        if (key == Qt::Key_Left)
            key = Qt::Key_Right;
        else if (key == Qt::Key_Right)
            key = Qt::Key_Left;
    }
    if (key == Qt::Key_Tab) //means down
        key = Qt::Key_Down;

    bool key_consumed = false;
    switch(key) {
    case Qt::Key_Home:
        key_consumed = true;
        if (d->scroll) {
            for(int i = 0; i < d->actionList.size(); ++i) {
                QAction *act = d->actionList.at(i);
                if (!act->isSeparator() &&
                    (style()->styleHint(QStyle::SH_Menu_AllowActiveAndDisabled, 0, this)
                     || act->isEnabled())) {
                    if(d->scroll->scrollFlags & QMenuPrivate::QMenuScroller::ScrollUp)
                        d->scrollMenu(act, QMenuPrivate::QMenuScroller::ScrollTop, true);
                    else
                        d->setCurrentAction(act);
                    break;
                }
            }
        }
        break;
    case Qt::Key_End:
        key_consumed = true;
        if (d->scroll) {
            for(int i = d->actionList.size()-1; i >= 0; --i) {
                QAction *act = d->actionList.at(i);
                if (!act->isSeparator() &&
                    (style()->styleHint(QStyle::SH_Menu_AllowActiveAndDisabled, 0, this)
                     || act->isEnabled())) {
                    if(d->scroll->scrollFlags & QMenuPrivate::QMenuScroller::ScrollDown)
                        d->scrollMenu(act, QMenuPrivate::QMenuScroller::ScrollBottom, true);
                    else
                        d->setCurrentAction(act);
                    break;
                }
            }
        }
        break;
    case Qt::Key_PageUp:
        key_consumed = true;
        if (d->currentAction && d->scroll)
            d->scrollMenu(QMenuPrivate::QMenuScroller::ScrollUp, true, true);
        break;
    case Qt::Key_PageDown:
        key_consumed = true;
        if (d->currentAction && d->scroll)
            d->scrollMenu(QMenuPrivate::QMenuScroller::ScrollDown, true, true);
        break;
    case Qt::Key_Up:
    case Qt::Key_Down: {
        key_consumed = true;
        QAction *nextAction = 0;
        QMenuPrivate::QMenuScroller::ScrollLocation scroll_loc = QMenuPrivate::QMenuScroller::ScrollStay;
        if (!d->currentAction) {
            if(key == Qt::Key_Down) {
                for(int i = 0; i < d->actionList.size(); ++i) {
                    QAction *act = d->actionList.at(i);
                    if (!act->isSeparator() &&
                        (style()->styleHint(QStyle::SH_Menu_AllowActiveAndDisabled, 0, this)
                         || act->isEnabled())) {
                        nextAction = act;
                        break;
                    }
                }
            } else {
                for(int i = d->actionList.size()-1; i >= 0; --i) {
                    QAction *act = d->actionList.at(i);
                    if (!act->isSeparator() &&
                        (style()->styleHint(QStyle::SH_Menu_AllowActiveAndDisabled, 0, this)
                         || act->isEnabled())) {
                        nextAction = act;
                        break;
                    }
                }
            }
        } else {
            for(int i=0, y=0; !nextAction && i < (int)d->actionList.count(); i++) {
                QAction *act = d->actionList.at(i);
                if (act == d->currentAction) {
                    if (key == Qt::Key_Up) {
                        for(int next_i = i-1; true; next_i--) {
                            if (next_i == -1) {
                                if (d->scroll)
                                    break;
                                next_i = d->actionList.count()-1;
                            }
                            QAction *next = d->actionList.at(next_i);
                            if (next == d->currentAction)
                                break;
                            if (next->isSeparator() ||
                               (!next->isEnabled() &&
                                !style()->styleHint(QStyle::SH_Menu_AllowActiveAndDisabled, 0, this)))
                                continue;
                            nextAction = next;
                            if (d->scroll && (d->scroll->scrollFlags & QMenuPrivate::QMenuScroller::ScrollUp)) {
                                int topVisible = style()->pixelMetric(QStyle::PM_MenuScrollerHeight, 0, this);
                                if (d->tearoff)
                                    topVisible += style()->pixelMetric(QStyle::PM_MenuTearoffHeight, 0, this);
                                if (((y + d->scroll->scrollOffset) - topVisible) <= d->actionRects.value(nextAction).height())
                                    scroll_loc = QMenuPrivate::QMenuScroller::ScrollTop;
                            }
                            break;
                        }
                        if (!nextAction && d->tearoff)
                            d->tearoffHighlighted = 1;
                    } else {
                        y += d->actionRects.value(act).height();
                        for(int next_i = i+1; true; next_i++) {
                            if (next_i == d->actionList.count()) {
                                if (d->scroll)
                                    break;
                                next_i = 0;
                            }
                            QAction *next = d->actionList.at(next_i);
                            if (next == d->currentAction)
                                break;
                            if (next->isSeparator() ||
                               (!next->isEnabled() &&
                                !style()->styleHint(QStyle::SH_Menu_AllowActiveAndDisabled, 0, this)))
                                continue;
                            nextAction = next;
                            if (d->scroll && (d->scroll->scrollFlags & QMenuPrivate::QMenuScroller::ScrollDown)) {
                                const int scrollerHeight = style()->pixelMetric(QStyle::PM_MenuScrollerHeight, 0, this);
                                int bottomVisible = height()-scrollerHeight;
                                if (d->scroll->scrollFlags & QMenuPrivate::QMenuScroller::ScrollUp)
                                    bottomVisible -= scrollerHeight;
                                if (d->tearoff)
                                    bottomVisible -= style()->pixelMetric(QStyle::PM_MenuTearoffHeight, 0, this);
                                if ((y + d->scroll->scrollOffset + d->ac