qmenu.cpp

奇趣公司比较新的qt/emd版本

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#include "qmenu.h"

#ifndef QT_NO_MENU

#include "qdebug.h"
#include "qstyle.h"
#include "qevent.h"
#include "qtimer.h"
#include "qlayout.h"
#include "qpainter.h"
#include "qapplication.h"
#include "qdesktopwidget.h"
#ifndef QT_NO_ACCESSIBILITY
# include "qaccessible.h"
#endif
#ifndef QT_NO_EFFECTS
# include <private/qeffects_p.h>
#endif
#ifndef QT_NO_WHATSTHIS
# include <qwhatsthis.h>
#endif

#include "qmenu_p.h"
#include "qmenubar_p.h"
#include "qwidgetaction.h"
#include "qtoolbutton.h"
#include <private/qaction_p.h>
#ifdef QT3_SUPPORT
#include <qmenudata.h>
#endif // QT3_SUPPORT

#ifdef Q_WS_X11
#include <private/qt_x11_p.h>
#endif


QPointer<QMenu> QMenuPrivate::mouseDown;
QBasicTimer QMenuPrivate::menuDelayTimer;
QBasicTimer QMenuPrivate::sloppyDelayTimer;

/* QMenu code */
// internal class used for the torn off popup
class QTornOffMenu : public QMenu
{
    Q_OBJECT
    class QTornOffMenuPrivate : public QMenuPrivate
    {
        Q_DECLARE_PUBLIC(QMenu)
    public:
        QTornOffMenuPrivate(QMenu *p) : causedMenu(p) {
            tornoff = 1;
            causedPopup.widget = 0;
            causedPopup.action = ((QTornOffMenu*)p)->d_func()->causedPopup.action;
            causedStack = ((QTornOffMenu*)p)->d_func()->calcCausedStack();
        }
        QList<QPointer<QWidget> > calcCausedStack() const { return causedStack; }
        QPointer<QMenu> causedMenu;
        QList<QPointer<QWidget> > causedStack;
    };
public:
    QTornOffMenu(QMenu *p) : QMenu(*(new QTornOffMenuPrivate(p)))
    {
        setParent(p, Qt::Window | Qt::Tool);
	setAttribute(Qt::WA_DeleteOnClose, true);
        setWindowTitle(p->windowTitle());
        setEnabled(p->isEnabled());
        //QObject::connect(this, SIGNAL(triggered(QAction*)), this, SLOT(onTrigger(QAction*)));
        //QObject::connect(this, SIGNAL(hovered(QAction*)), this, SLOT(onHovered(QAction*)));
        QList<QAction*> items = p->actions();
        for(int i = 0; i < items.count(); i++)
            addAction(items.at(i));
    }
    void syncWithMenu(QMenu *menu, QActionEvent *act)
    {
        Q_D(QTornOffMenu);
        if(menu != d->causedMenu)
            return;
        if (act->type() == QEvent::ActionAdded) {
            insertAction(act->before(), act->action());
        } else if (act->type() == QEvent::ActionRemoved)
            removeAction(act->action());
    }
    void actionEvent(QActionEvent *e)
    {
        QMenu::actionEvent(e);
        setFixedSize(sizeHint());
    }
public slots:
    void onTrigger(QAction *action) { d_func()->activateAction(action, QAction::Trigger, false); }
    void onHovered(QAction *action) { d_func()->activateAction(action, QAction::Hover, false); }
private:
    Q_DECLARE_PRIVATE(QTornOffMenu)
    friend class QMenuPrivate;
};
#include "qmenu.moc"

void QMenuPrivate::init()
{
    Q_Q(QMenu);
#ifndef QT_NO_WHATSTHIS
    q->setAttribute(Qt::WA_CustomWhatsThis);
#endif
    q->setMouseTracking(q->style()->styleHint(QStyle::SH_Menu_MouseTracking, 0, q));
    if (q->style()->styleHint(QStyle::SH_Menu_Scrollable, 0, q)) {
        scroll = new QMenuPrivate::QMenuScroller;
        scroll->scrollFlags = QMenuPrivate::QMenuScroller::ScrollNone;
    }
    defaultMenuAction = menuAction = new QAction(q);
    menuAction->d_func()->menu = q;
}

//Windows and KDE allows menus to cover the taskbar, while GNOME and Mac don't
QRect QMenuPrivate::popupGeometry(int screen) const
{
#ifdef Q_WS_WIN
    return QApplication::desktop()->screenGeometry(screen);
#elif defined Q_WS_X11
    if (X11->desktopEnvironment == DE_KDE)
        return QApplication::desktop()->screenGeometry(screen);
    else
        return QApplication::desktop()->availableGeometry(screen);
#else
        return QApplication::desktop()->availableGeometry(screen);
#endif
}

QList<QPointer<QWidget> > QMenuPrivate::calcCausedStack() const
{
    QList<QPointer<QWidget> > ret;
    for(QWidget *widget = causedPopup.widget; widget; ) {
        ret.append(widget);
        if (QTornOffMenu *qtmenu = ::qobject_cast<QTornOffMenu*>(widget))
            ret += qtmenu->d_func()->causedStack;
        if (QMenu *qmenu = ::qobject_cast<QMenu*>(widget))
            widget = qmenu->d_func()->causedPopup.widget;
        else
            break;
    }
    return ret;
}

void QMenuPrivate::calcActionRects(QMap<QAction*, QRect> &actionRects, QList<QAction*> &actionList) const
{
    Q_Q(const QMenu);
    if (!itemsDirty) {
        actionRects = this->actionRects;
        actionList = this->actionList;
        return;
    }

    actionRects.clear();
    actionList.clear();
    QList<QAction*> items = filterActions(q->actions());
    int max_column_width = 0,
        dh = popupGeometry(QApplication::desktop()->screenNumber(q)).height(),
        ncols = 1,
        y = 0;
    const int hmargin = q->style()->pixelMetric(QStyle::PM_MenuHMargin, 0, q),
              vmargin = q->style()->pixelMetric(QStyle::PM_MenuVMargin, 0, q),
              icone = q->style()->pixelMetric(QStyle::PM_SmallIconSize, 0, q);

    //for compatability now - will have to refactor this away..
    tabWidth = 0;
    maxIconWidth = 0;
    hasCheckableItems = false;
    for(int i = 0; i < items.count(); i++) {
        QAction *action = items.at(i);
        if (widgetItems.value(action))
            continue;
        hasCheckableItems |= action->isCheckable();
        QIcon is = action->icon();
        if (!is.isNull()) {
            uint miw = maxIconWidth;
            maxIconWidth = qMax<uint>(miw, icone + 4);
        }
    }

    //calculate size
    QFontMetrics qfm = q->fontMetrics();
    for(int i = 0; i < items.count(); i++) {
        QAction *action = items.at(i);

        QFontMetrics fm(action->font().resolve(q->font()));
        QSize sz;

        //let the style modify the above size..
        QStyleOptionMenuItem opt;
        q->initStyleOption(&opt, action);
        opt.rect = q->rect();

        if (QWidget *w = widgetItems.value(action)) {
          sz=w->sizeHint().expandedTo(w->minimumSize()).expandedTo(w->minimumSizeHint()).boundedTo(w->maximumSize());
        } else {
            //calc what I think the size is..
            if (action->isSeparator()) {
                sz = QSize(2, 2);
            } else {
                QString s = action->text();
                int t = s.indexOf(QLatin1Char('\t'));
                if (t != -1) {
                    tabWidth = qMax(int(tabWidth), qfm.width(s.mid(t+1)));
                    s = s.left(t);
    #ifndef QT_NO_SHORTCUT
                } else {
                    QKeySequence seq = action->shortcut();
                    if (!seq.isEmpty())
                        tabWidth = qMax(int(tabWidth), qfm.width(seq));
    #endif
                }
                int w = fm.width(s);
                w -= s.count(QLatin1Char('&')) * fm.width(QLatin1Char('&'));
                w += s.count(QLatin1String("&&")) * fm.width(QLatin1Char('&'));
                sz.setWidth(w);
                sz.setHeight(qMax(fm.height(), qfm.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());
                }
            }
          sz = q->style()->sizeFromContents(QStyle::CT_MenuItem, &opt, sz, q);
        }


        if (!sz.isEmpty()) {
            max_column_width = qMax(max_column_width, sz.width());
            //wrapping
            if (!scroll &&
               y+sz.height()+vmargin > dh - (q->style()->pixelMetric(QStyle::PM_MenuDesktopFrameWidth, 0, q) * 2)) {
                ncols++;
                y = vmargin;
            }
            y += sz.height();
            //append item
            actionRects.insert(action, QRect(0, 0, sz.width(), sz.height()));
            actionList.append(action);
        }
    }

    if (tabWidth)
        max_column_width += tabWidth; //finally add in the tab width

    //calculate position
    int x = hmargin;
    y = vmargin;

    for(int i = 0; i < actionList.count(); i++) {
        QAction *action = actionList.at(i);
        QRect &rect = actionRects[action];
        if (rect.isNull())
            continue;
        if (!scroll &&
           y+rect.height() > dh - (q->style()->pixelMetric(QStyle::PM_MenuDesktopFrameWidth, 0, q) * 2)) {
            ncols--;
            if (ncols < 0)
                qWarning("QMenu: Column calculation mismatch (%d)", ncols);
            x += max_column_width + hmargin;
            y = vmargin;
        }
        rect.translate(x, y);                        //move
        rect.setWidth(max_column_width); //uniform width
        y += rect.height();
    }
}

void QMenuPrivate::updateActions()
{
    Q_Q(const QMenu);
    if (!itemsDirty)
        return;
    sloppyAction = 0;
    calcActionRects(actionRects, actionList);
    for (QHash<QAction *, QWidget *>::ConstIterator item = widgetItems.constBegin(),
         end = widgetItems.constEnd(); item != end; ++item) {
        QAction *action = item.key();
        QWidget *widget = item.value();
        widget->setGeometry(actionRect(action));
        widget->setVisible(action->isVisible());
    }
    ncols = 1;
    int last_left = q->style()->pixelMetric(QStyle::PM_MenuVMargin, 0, q);
    if (!scroll) {
        for(int i = 0; i < actionList.count(); i++) {
            int left = actionRects.value(actionList.at(i)).left();
            if (left > last_left) {
                last_left = left;
                ncols++;
            }
        }
    }
    itemsDirty = 0;
}

QList<QAction *> QMenuPrivate::filterActions(const QList<QAction *> &actions) const
{
    QList<QAction *> visibleActions;
    int i = 0;
    while (i < actions.count()) {
        QAction *action = actions.at(i);
        if (!action->isVisible()) {
            ++i;
            continue;
        }
        if (!action->isSeparator() || !collapsibleSeparators) {
            visibleActions.append(action);
            ++i;
            continue;
        }

        // no leading separators
        if (!visibleActions.isEmpty())
            visibleActions.append(action);

        // skip double/tripple/etc. separators
        while (i < actions.count()
               && (!actions.at(i)->isVisible() || actions.at(i)->isSeparator()))
            ++i;
    }

    if (collapsibleSeparators) {
        // remove trailing separators
        while (!visibleActions.isEmpty() && visibleActions.last()->isSeparator())
            visibleActions.removeLast();
    }

    return visibleActions;
}

QRect QMenuPrivate::actionRect(QAction *act) const
{
    Q_Q(const QMenu);
    QRect ret = actionRects.value(act);
    if (ret.isNull())
        return ret;
    if (scroll)
        ret.translate(0, scroll->scrollOffset);
    if (tearoff)
        ret.translate(0, q->style()->pixelMetric(QStyle::PM_MenuTearoffHeight, 0, q));
    const int fw = q->style()->pixelMetric(QStyle::PM_MenuPanelWidth, 0, q);
    ret.translate(fw+leftmargin, fw+topmargin);
    return ret;
}

void QMenuPrivate::hideUpToMenuBar()
{
    Q_Q(QMenu);
    if (!tornoff) {
        QWidget *caused = causedPopup.widget;
        q->hide(); //hide after getting causedPopup
        while(caused) {
#ifndef QT_NO_MENUBAR
            if (QMenuBar *mb = qobject_cast<QMenuBar*>(caused)) {
                mb->d_func()->setCurrentAction(0);
                caused = 0;
            } else
#endif