qmenubar.cpp

qt-x11-opensource-src-4.1.4.tar.gz源码

/****************************************************************************
**
** Copyright (C) 1992-2006 Trolltech ASA. All rights reserved.
**
** This file is part of the QtGui module of the Qt Toolkit.
**
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** License version 2.0 as published by the Free Software Foundation
** and appearing in the file LICENSE.GPL included in the packaging of
** this file.  Please review the following information to ensure GNU
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** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
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#include <qmenubar.h>

#include <qstyle.h>
#include <qlayout.h>
#include <qapplication.h>
#include <qdesktopwidget.h>
#ifndef QT_NO_ACCESSIBILITY
# include <qaccessible.h>
#endif
#include <qpainter.h>
#include <qevent.h>
#include <qmainwindow.h>
#include <qtoolbar.h>
#include <qtoolbutton.h>
#include <qwhatsthis.h>

#ifndef QT_NO_MENUBAR

#ifdef QT3_SUPPORT
#include <private/qaction_p.h>
#include <qmenudata.h>
#endif

#include "qmenu_p.h"
#include "qmenubar_p.h"
#include "qdebug.h"


class QMenuBarExtension : public QToolButton
{
public:
    explicit QMenuBarExtension(QWidget *parent);

    QSize sizeHint() const;
};

QMenuBarExtension::QMenuBarExtension(QWidget *parent)
    : QToolButton(parent)
{
    setObjectName(QLatin1String("qt_menubar_ext_button"));
    setAutoRaise(true);
#ifndef QT_NO_MENU
    setPopupMode(QToolButton::InstantPopup);
#endif
    setIcon(style()->standardPixmap(QStyle::SP_ToolBarHorizontalExtensionButton));
}

QSize QMenuBarExtension::sizeHint() const
{
    int ext = style()->pixelMetric(QStyle::PM_ToolBarExtensionExtent);
    return QSize(ext, ext);
}

QAction *QMenuBarPrivate::actionAt(QPoint p) const
{
    Q_Q(const QMenuBar);
    QList<QAction*> items = q->actions();
    for(int i = 0; i < items.size(); ++i) {
        if(actionRect(items.at(i)).contains(p))
            return items.at(i);
    }
    return 0;
}

bool QMenuBarPrivate::isVisible(QAction *action)
{
    Q_Q(QMenuBar);

    if (!extension->isHidden()) {
        int hmargin = q->style()->pixelMetric(QStyle::PM_MenuBarPanelWidth, 0, q);
        QRect menuRect = q->rect();
        if (QApplication::layoutDirection() == Qt::RightToLeft)
            menuRect.setLeft(menuRect.left() + extension->width() + hmargin);
        else
            menuRect.setWidth(menuRect.width() - extension->width() - hmargin);
        if (menuRect.contains(actionRect(action)))
            return true;
        else
            return false;
     }
     return true;
}

void QMenuBarPrivate::updateGeometries()
{
    Q_Q(QMenuBar);
    if(!itemsDirty)
        return;
    int q_width = q->width()-(q->style()->pixelMetric(QStyle::PM_MenuBarPanelWidth, 0, q)*2);
    int q_start = -1;
    if(leftWidget || rightWidget) {
        int vmargin = q->style()->pixelMetric(QStyle::PM_MenuBarVMargin, 0, q)
                      + q->style()->pixelMetric(QStyle::PM_MenuBarPanelWidth, 0, q);
        int hmargin = q->style()->pixelMetric(QStyle::PM_MenuBarHMargin, 0, q)
                      + q->style()->pixelMetric(QStyle::PM_MenuBarPanelWidth, 0, q);
        if(leftWidget && leftWidget->isVisible()) {
            QSize sz = leftWidget->sizeHint();
            q_width -= sz.width();
            q_start = sz.width();
            leftWidget->setGeometry(QRect(QPoint(hmargin, vmargin), sz));
        }
        if(rightWidget && rightWidget->isVisible()) {
            QSize sz = rightWidget->sizeHint();
            q_width -= sz.width();
            rightWidget->setGeometry(QRect(QPoint(q->width() - sz.width() - hmargin, vmargin), sz));
        }
    }

#ifdef Q_WS_MAC
    if(mac_menubar) {//nothing to see here folks, move along..
        itemsDirty = false;
        return;
    }
#endif
    calcActionRects(q_width, q_start, actionRects, actionList);
    itemsWidth = q_width;
    itemsStart = q_start;
    currentAction = 0;
#ifndef QT_NO_SHORTCUT
    if(itemsDirty) {
        for(int j = 0; j < shortcutIndexMap.size(); ++j)
            q->releaseShortcut(shortcutIndexMap.value(j));
        shortcutIndexMap.resize(0); // faster than clear
        for(int i = 0; i < actionList.count(); i++)
            shortcutIndexMap.append(q->grabShortcut(QKeySequence::mnemonic(actionList.at(i)->text())));
    }
#endif
    itemsDirty = false;

    QList<QAction *> hiddenActions;
    int hmargin = q->style()->pixelMetric(QStyle::PM_MenuBarPanelWidth, 0, q);
    QRect menuRect = q->rect();
    if (!extension->isHidden() && (menuRect.width() < q->sizeHint().width())) {
        if (QApplication::layoutDirection() == Qt::RightToLeft)
            menuRect.setLeft(menuRect.left() + extension->width() + hmargin);
        else
            menuRect.setWidth(menuRect.width() - extension->width() - hmargin);
    }
    for (int i = 0; i < actionList.count(); ++i) {
        if (!menuRect.contains(actionRect(actionList.at(i))))
            hiddenActions.append(actionList.at(i));
    }

    if (hiddenActions.count() > 0) {
        QMenu *pop = extension->menu();
        if (!pop) {
            pop = new QMenu(q);
            extension->setMenu(pop);
        }
        pop->clear();
        pop->addActions(hiddenActions);

        int vmargin = q->style()->pixelMetric(QStyle::PM_MenuBarVMargin, 0, q);
        int x = QApplication::layoutDirection() == Qt::RightToLeft
                ? hmargin
                : q->width() - extension->sizeHint().width() - hmargin;
        extension->setGeometry(x, vmargin, extension->sizeHint().width(), menuRect.height() - vmargin*2);
        extension->show();
    } else {
        extension->hide();
    }
    q->updateGeometry();
#ifdef QT3_SUPPORT
    if (q->parentWidget() != 0) {
        QMenubarUpdatedEvent menubarUpdated(q);
        QApplication::sendEvent(q->parentWidget(), &menubarUpdated);
    }
#endif
}

QRect QMenuBarPrivate::actionRect(QAction *act) const
{
    Q_Q(const QMenuBar);
    QRect ret = actionRects.value(act);
    const int fw = q->style()->pixelMetric(QStyle::PM_MenuBarPanelWidth, 0, q);
    ret.translate(fw, fw);
    return QStyle::visualRect(q->layoutDirection(), q->rect(), ret);
}

void QMenuBarPrivate::setKeyboardMode(bool b)
{
    Q_Q(QMenuBar);
    if (b && !q->style()->styleHint(QStyle::SH_MenuBar_AltKeyNavigation, 0, q)) {
        setCurrentAction(0);
        return;
    }
    keyboardState = b;
    if(b) {
        QWidget *fw = qApp->focusWidget();
        if (fw != q)
            keyboardFocusWidget = qApp->focusWidget();
        if(!currentAction && !actionList.isEmpty())
            setCurrentAction(actionList.first());
        q->setFocus();
    } else {
        if(!popupState)
            setCurrentAction(0);
        if(keyboardFocusWidget) {
            keyboardFocusWidget->setFocus();
            keyboardFocusWidget = 0;
        }
    }
    q->update();
}

void QMenuBarPrivate::popupAction(QAction *action, bool activateFirst)
{
    Q_Q(QMenuBar);
    if(!action || !action->menu())
        return;
    popupState = true;
    if (action->isEnabled() && action->menu()->isEnabled()) {
        closePopupMode = 0;
        activeMenu = action->menu();
        activeMenu->d_func()->causedPopup.widget = q;
        activeMenu->d_func()->causedPopup.action = action;

        QRect adjustedActionRect = actionRect(action);
        QPoint pos(q->mapToGlobal(QPoint(adjustedActionRect.left(), adjustedActionRect.bottom() + 1)));
        QSize popup_size = activeMenu->sizeHint();
        if(q->isRightToLeft())
            pos.setX(pos.x()-(popup_size.width()-adjustedActionRect.width()));

        QRect screenRect = QApplication::desktop()->screenGeometry(pos);
        if(pos.x() < screenRect.x()) {
            pos.setX(screenRect.x());
        } else {
            const int off = pos.x()+popup_size.width() - screenRect.right();
            if(off > 0)
                pos.setX(qMax(screenRect.x(), pos.x()-off));

        }

        if(!defaultPopDown || (pos.y() + popup_size.height() > screenRect.bottom()))
            pos.setY(qMax(screenRect.y(), q->mapToGlobal(QPoint(0, adjustedActionRect.top()-popup_size.height())).y()));
        activeMenu->popup(pos);
        if(activateFirst)
            activeMenu->d_func()->setFirstActionActive();
    }
    q->update(actionRect(action));
}

void QMenuBarPrivate::setCurrentAction(QAction *action, bool popup, bool activateFirst)
{
    if(currentAction == action && popup == popupState)
        return;

    doChildEffects = (popup && !activeMenu);
    Q_Q(QMenuBar);
    QWidget *fw = 0;
    if(activeMenu) {
        QMenu *menu = activeMenu;
        activeMenu = NULL;
        if (popup) {
            fw = q->window()->focusWidget();
            q->setFocus(Qt::NoFocusReason);
        }
        menu->hide();
    }
    if(currentAction)
        q->update(actionRect(currentAction));

    popupState = popup;
    QAction *previousAction = currentAction;
    currentAction = action;
    if(action) {
        activateAction(action, QAction::Hover);
        if(popup)
            popupAction(action, activateFirst);
        q->update(actionRect(action));
    }  else if (previousAction) {
        QString empty;
        QStatusTipEvent tip(empty);
        QApplication::sendEvent(q, &tip);
    }


    if (fw)
        fw->setFocus(Qt::NoFocusReason);
}

void QMenuBarPrivate::calcActionRects(int max_width, int start, QMap<QAction*, QRect> &actionRects, QList<QAction*> &actionList) const
{
    Q_Q(const QMenuBar);

    if(!itemsDirty && itemsWidth == max_width && itemsStart == start) {
        actionRects = actionRects;
        actionList = actionList;
        return;
    }
    actionRects.clear();
    actionList.clear();
    const int itemSpacing = q->style()->pixelMetric(QStyle::PM_MenuBarItemSpacing, 0, q);
    int max_item_height = 0, separator = -1, separator_start = 0, separator_len = 0;
    QList<QAction*> items = q->actions();

    //calculate size
    const QFontMetrics fm = q->fontMetrics();
    const int hmargin = q->style()->pixelMetric(QStyle::PM_MenuBarHMargin, 0, q),
              vmargin = q->style()->pixelMetric(QStyle::PM_MenuBarVMargin, 0, q),
                icone = q->style()->pixelMetric(QStyle::PM_SmallIconSize, 0, q);
    for(int i = 0; i < items.count(); i++) {
        QAction *action = items.at(i);
        if(!action->isVisible())
            continue;

        QSize sz;

        //calc what I think the size is..
        if(action->isSeparator()) {
            if (q->style()->styleHint(QStyle::SH_DrawMenuBarSeparator, 0, q))
                separator = actionRects.count();
            continue; //we don't really position these!
        } else {
            QString s = action->text();
            if(!s.isEmpty()) {
                int w = fm.width(s);
                w -= s.count('&') * fm.width('&');
                w += s.count("&&") * fm.width('&');
                sz = QSize(w, fm.height());
            }

            QIcon is = action->icon();
            if (!is.isNull()) {
                QSize is_sz = QSize(icone, icone);
                if (is_sz.height() > sz.height())
                    sz.setHeight(is_sz.height());
                if (is_sz.width() > sz.width())
                    sz.setWidth(is_sz.width());
            }
        }

        //let the style modify the above size..
        QStyleOptionMenuItem opt = getStyleOption(action);
        sz = q->style()->sizeFromContents(QStyle::CT_MenuBarItem, &opt, sz, q);

        if(!sz.isEmpty()) {
            { //update the separator state
                int iWidth = sz.width();
                iWidth += itemSpacing;
                if(separator == -1)
                    separator_start += iWidth;
                else
                    separator_len += iWidth;
            }
            //maximum height
            max_item_height = qMax(max_item_height, sz.height());
            //append
            actionRects.insert(action, QRect(0, 0, sz.width(), sz.height()));
            actionList.append(action);
        }
    }

    //calculate position
    int x = ((start == -1) ? hmargin : start) + itemSpacing;
    int y = vmargin;
    for(int i = 0; i < actionList.count(); i++) {
        QAction *action = actionList.at(i);
        QRect &rect = actionRects[action];
        //resize
        rect.setHeight(max_item_height);

        //move
        if(separator != -1 && i >= separator) { //after the separator
            int left = (max_width - separator_len - hmargin - itemSpacing) + (x - separator_start - hmargin);
            if(left < separator_start) { //wrap
                separator_start = x = hmargin;
                y += max_item_height;
            }
            rect.moveLeft(left);
        } else {
            rect.moveLeft(x);
        }
        rect.moveTop(y);

        //keep moving along..
        x += rect.width() + itemSpacing;
    }
}

void QMenuBarPrivate::activateAction(QAction *action, QAction::ActionEvent action_e)
{
    Q_Q(QMenuBar);
    if (!action || !action->isEnabled())
        return;
    action->activate(action_e);
    if (action_e == QAction::Hover)
        action->showStatusText(q);

//     if(action_e == QAction::Trigger)
//         emit q->activated(action);
//     else if(action_e == QAction::Hover)
//         emit q->highlighted(action);
}


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

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


QStyleOptionMenuItem QMenuBarPrivate::getStyleOption(const QAction *action) const
{
    Q_Q(const QMenuBar);
    QStyleOptionMenuItem opt;
    opt.palette = q->palette();
    opt.state = QStyle::State_None;
    if (q->isEnabled() && action->isEnabled())
        opt.state |= QStyle::State_Enabled;
    else
        opt.palette.setCurrentColorGroup(QPalette::Disabled);
    opt.fontMetrics = q->fontMetrics();
    if (currentAction && currentAction == action) {
        opt.state |= QStyle::State_Selected;
        if (popupState && !closePopupMode)
            opt.state |= QStyle::State_Sunken;
    }
    if (q->hasFocus() || currentAction)
        opt.state |= QStyle::State_HasFocus;
    opt.menuRect = q->rect();
    opt.menuItemType = QStyleOptionMenuItem::Normal;
    opt.checkType = QStyleOptionMenuItem::NotCheckable;
    opt.text = action->text();
    opt.icon = action->icon();
    return opt;
}

/*!
    \class QMenuBar
    \brief The QMenuBar class provides a horizontal menu bar.

    \ingroup application
    \mainclass

    A menu bar consists of a list of pull-down menu items. You add
    menu items with addMenu(). For example, asuming that \c menubar
    is a pointer to a QMenuBar and \c fileMenu is a pointer to a
    QMenu, the following statement inserts the menu into the menu bar:
    \code
      menubar->addMenu(fileMenu);
    \endcode