qmenubar.cpp

奇趣公司比较新的qt/emd版本

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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()->standardIcon(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;
}

QRect QMenuBarPrivate::menuRect(bool extVisible) const
{
    Q_Q(const QMenuBar);

    int hmargin = q->style()->pixelMetric(QStyle::PM_MenuBarPanelWidth, 0, q);
    QRect result = q->rect();
    result.adjust(hmargin, 0, -hmargin, 0);

    if (extVisible) {
        if (q->layoutDirection() == Qt::RightToLeft)
            result.setLeft(result.left() + extension->sizeHint().width());
        else
            result.setWidth(result.width() - extension->sizeHint().width());
    }

    if (leftWidget && leftWidget->isVisible()) {
        QSize sz = leftWidget->sizeHint();
        if (q->layoutDirection() == Qt::RightToLeft)
            result.setRight(result.right() - sz.width());
        else
            result.setLeft(result.left() + sz.width());
    }

    if (rightWidget && rightWidget->isVisible()) {
        QSize sz = rightWidget->sizeHint();
        if (q->layoutDirection() == Qt::RightToLeft)
            result.setLeft(result.left() + sz.width());
        else
            result.setRight(result.right() - sz.width());
    }

    return result;
}

bool QMenuBarPrivate::isVisible(QAction *action)
{
    return !hiddenActions.contains(action);
}

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();
            QPoint pos(hmargin, (q->height() - leftWidget->height()) / 2);
            QRect vRect = QStyle::visualRect(q->layoutDirection(), q->rect(), QRect(pos, sz));
            leftWidget->setGeometry(vRect);
        }
        if (rightWidget && rightWidget->isVisible()) {
            QSize sz = rightWidget->sizeHint();
            q_width -= sz.width();
            QPoint pos(q->width() - sz.width() - hmargin, vmargin);
            QRect vRect = QStyle::visualRect(q->layoutDirection(), q->rect(), QRect(pos, sz));
            rightWidget->setGeometry(vRect);
        }
    }

#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;

    hiddenActions.clear();
    //this is the menu rectangle without any extension
    QRect menuRect = this->menuRect(false);

    //we try to see if the actions will fit there
    bool hasHiddenActions = false;
    foreach(QAction *action, actionList) {
        if (!menuRect.contains(actionRect(action))) {
            hasHiddenActions = true;
            break;
        }
    }

    //...and if not, determine the ones that fit on the menu with the extension visible
    if (hasHiddenActions) {
        menuRect = this->menuRect(true);
        foreach(QAction *action, actionList) {
            if (!menuRect.contains(actionRect(action))) {
                hiddenActions.append(action);
            }
        }
    }

    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 = q->layoutDirection() == Qt::RightToLeft
                ? menuRect.left() - extension->sizeHint().width() + 1
                : menuRect.right();
        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() || closePopupMode)
        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();

        QRect screenRect = QApplication::desktop()->screenGeometry(pos);

        const bool fitUp = (q->mapToGlobal(adjustedActionRect.topLeft()).y() >= popup_size.height());
        const bool fitDown = (pos.y() + popup_size.height() <= screenRect.bottom());
        const int actionWidth = adjustedActionRect.width();

        if (!fitUp && !fitDown) { //we should shift the menu
            bool shouldShiftToRight = !q->isRightToLeft();
            if (q->isRightToLeft() && popup_size.width() > pos.x())
                shouldShiftToRight = true;
            else if (actionWidth + popup_size.width() + pos.x() > screenRect.right())
                shouldShiftToRight = false;

            if (shouldShiftToRight)
                pos.rx() += actionWidth;
            else
                pos.rx() -= popup_size.width();
        } else if (q->isRightToLeft()) {
            pos.setX(pos.x()-(popup_size.width() - actionWidth));
        }

        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 || (fitUp && !fitDown))
            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));
}

bool QMenuBarPrivate::closeActiveMenu()
{
    if(activeMenu) {
        QMenu *menu = activeMenu;
        activeMenu = 0;
        menu->hide();
        return true;
    }
    return false;
}

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(closeActiveMenu() && popup) {
        fw = q->window()->focusWidget();
        q->setFocus(Qt::NoFocusReason);
    }
    if(currentAction)
        q->update(actionRect(currentAction));

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

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(QLatin1Char('&')) * fm.width(QLatin1Char('&'));
                w += s.count(QLatin1String("&&")) * fm.width(QLatin1Char('&'));
                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;
        q->initStyleOption(&opt, 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