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qmenu_p.h

/****************************************************************************
**
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**
** This file is part of the QtGui module of the Qt Toolkit.
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** License versions 2.0 or 3.0 as published by the Free Software
** Foundation and appearing in the files LICENSE.GPL2 and LICENSE.GPL3
** included in the packaging of this file.  Alternatively you may (at
** your option) use any later version of the GNU General Public
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** additional rights. These rights are described in the Trolltech GPL
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#ifndef QMENU_P_H
#define QMENU_P_H

//
//  W A R N I N G
//  -------------
//
// This file is not part of the Qt API.  It exists purely as an
// implementation detail.  This header file may change from version to
// version without notice, or even be removed.
//
// We mean it.
//

#include "QtGui/qmenubar.h"
#include "QtGui/qstyleoption.h"
#include "QtCore/qdatetime.h"
#include "QtCore/qmap.h"
#include "QtCore/qhash.h"
#include "QtCore/qbasictimer.h"
#include "private/qwidget_p.h"

#ifndef QT_NO_MENU

class QTornOffMenu;
class QEventLoop;

#ifdef Q_WS_MAC
struct QMacMenuAction {
    uint command;
    uchar ignore_accel : 1;
    uchar merged : 1;
    QPointer<QAction> action;
    MenuRef menu;
};
#endif

class QMenuPrivate : public QWidgetPrivate
{
    Q_DECLARE_PUBLIC(QMenu)
public:
    QMenuPrivate() : itemsDirty(0), maxIconWidth(0), tabWidth(0), ncols(0), collapsibleSeparators(true), hasHadMouse(0), motions(0),
                      currentAction(0), scroll(0), eventLoop(0), tearoff(0), tornoff(0), tearoffHighlighted(0),
                      hasCheckableItems(0), sloppyAction(0)
#ifdef Q_WS_MAC
                      ,mac_menu(0)
#endif
    { }
    ~QMenuPrivate()
    {
        delete scroll;
#ifdef Q_WS_MAC
        delete mac_menu;
#endif
    }
    void init();

    //item calculations
    mutable uint itemsDirty : 1;
    mutable uint maxIconWidth, tabWidth;
    QRect actionRect(QAction *) const;
    mutable QMap<QAction*, QRect> actionRects;
    mutable QList<QAction*> actionList;
    mutable QHash<QAction *, QWidget *> widgetItems;
    void calcActionRects(QMap<QAction*, QRect> &actionRects, QList<QAction*> &actionList) const;
    void updateActions();
    QRect popupGeometry(int screen=-1) const;
    QList<QAction *> filterActions(const QList<QAction *> &actions) const;
    uint ncols : 4; //4 bits is probably plenty
    uint collapsibleSeparators : 1;

    //selection
    static QPointer<QMenu> mouseDown;
    QPoint mousePopupPos;
    uint hasHadMouse : 1;
    int motions;
    QAction *currentAction;
    static QBasicTimer menuDelayTimer;
    enum SelectionReason {
        SelectedFromKeyboard,
        SelectedFromElsewhere
    };
    QAction *actionAt(QPoint p) const;
    void setFirstActionActive();
    void setCurrentAction(QAction *, int popup = -1, SelectionReason reason = SelectedFromElsewhere, bool activateFirst = false);
    void popupAction(QAction *, int, bool);
    void setSyncAction();

    //scrolling support
    struct QMenuScroller {
        enum ScrollLocation { ScrollStay, ScrollBottom, ScrollTop, ScrollCenter };
        enum ScrollDirection { ScrollNone=0, ScrollUp=0x01, ScrollDown=0x02 };
        uint scrollFlags : 2, scrollDirection : 2;
        int scrollOffset;
        QBasicTimer *scrollTimer;

        QMenuScroller() : scrollFlags(ScrollNone), scrollDirection(ScrollNone), scrollOffset(0), scrollTimer(0) { }
        ~QMenuScroller() { delete scrollTimer; }
    } *scroll;
    void scrollMenu(QMenuScroller::ScrollLocation location, bool active=false);
    void scrollMenu(QMenuScroller::ScrollDirection direction, bool page=false, bool active=false);
    void scrollMenu(QAction *action, QMenuScroller::ScrollLocation location, bool active=false);

    //synchronous operation (ie exec())
    QEventLoop *eventLoop;
    QPointer<QAction> syncAction;

    //search buffer
    QString searchBuffer;
    QBasicTimer searchBufferTimer;

    //passing of mouse events up the parent heirarchy
    QPointer<QMenu> activeMenu;
    bool mouseEventTaken(QMouseEvent *);

    //used to walk up the popup list
    struct QMenuCaused {
        QPointer<QWidget> widget;
        QPointer<QAction> action;
    };
    virtual QList<QPointer<QWidget> > calcCausedStack() const;
    QMenuCaused causedPopup;
    void hideUpToMenuBar();

    //index mappings
    inline QAction *actionAt(int i) const { return q_func()->actions().at(i); }
    inline int indexOf(QAction *act) const { return q_func()->actions().indexOf(act); }

    //tear off support
    uint tearoff : 1, tornoff : 1, tearoffHighlighted : 1;
    QPointer<QTornOffMenu> tornPopup;

    mutable bool hasCheckableItems;

    //sloppy selection
    static QBasicTimer sloppyDelayTimer;
    QAction *sloppyAction;
    QRegion sloppyRegion;

    //default action
    QPointer<QAction> defaultAction;

    QAction *menuAction;
    QAction *defaultMenuAction;

    void setOverrideMenuAction(QAction *);
    void _q_overrideMenuActionDestroyed();

    //firing of events
    void activateAction(QAction *, QAction::ActionEvent, bool self=true);

    void _q_actionTriggered();
    void _q_actionHovered();

    bool hasMouseMoved(const QPoint &globalPos);

    //menu fading/scrolling effects
    bool doChildEffects;

#ifdef Q_WS_MAC
    //mac menu binding
    struct QMacMenuPrivate {
        QList<QMacMenuAction*> actionItems;
        MenuRef menu;
        QMacMenuPrivate();
        ~QMacMenuPrivate();

        bool merged(const QAction *action) const;
        void addAction(QAction *, QMacMenuAction* =0, QMenuPrivate *qmenu = 0);
        void addAction(QMacMenuAction *, QMacMenuAction* =0, QMenuPrivate *qmenu = 0);
        void syncAction(QMacMenuAction *);
        inline void syncAction(QAction *a) { syncAction(findAction(a)); }
        void removeAction(QMacMenuAction *);
        inline void removeAction(QAction *a) { removeAction(findAction(a)); }
        inline QMacMenuAction *findAction(QAction *a) {
            for(int i = 0; i < actionItems.size(); i++) {
                QMacMenuAction *act = actionItems[i];
                if(a == act->action)
                    return act;
            }
            return 0;
        }
    } *mac_menu;
    MenuRef macMenu(MenuRef merge);
    void setMacMenuEnabled(bool enable = true);
#endif

    QPointer<QWidget> noReplayFor;
};

#endif // QT_NO_MENU

#endif // QMENU_P_H

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