summaryrefslogtreecommitdiffstats
path: root/src/widgets/kernel/qwidget_p.h
blob: e9d76822899746d86efe3dd805410aa34b84e1dc (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
/****************************************************************************
**
** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
** All rights reserved.
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of the QtGui module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** No Commercial Usage
** This file contains pre-release code and may not be distributed.
** You may use this file in accordance with the terms and conditions
** contained in the Technology Preview License Agreement accompanying
** this package.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 2.1 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL included in the
** packaging of this file.  Please review the following information to
** ensure the GNU Lesser General Public License version 2.1 requirements
** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Nokia gives you certain additional
** rights.  These rights are described in the Nokia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** If you have questions regarding the use of this file, please contact
** Nokia at qt-info@nokia.com.
**
**
**
**
**
**
**
**
** $QT_END_LICENSE$
**
****************************************************************************/

#ifndef QWIDGET_P_H
#define QWIDGET_P_H

//
//  W A R N I N G
//  -------------
//
// This file is not part of the Qt API.  It exists for the convenience
// of qapplication_*.cpp, qwidget*.cpp and qfiledialog.cpp.  This header
// file may change from version to version without notice, or even be removed.
//
// We mean it.
//

#include "QtWidgets/qwidget.h"
#include "private/qobject_p.h"
#include "QtCore/qrect.h"
#include "QtCore/qlocale.h"
#include "QtCore/qset.h"
#include "QtGui/qregion.h"
#include "QtWidgets/qsizepolicy.h"
#include "QtWidgets/qstyle.h"
#include "QtWidgets/qapplication.h"
#include <private/qgraphicseffect_p.h>
#include "QtWidgets/qgraphicsproxywidget.h"
#include "QtWidgets/qgraphicsscene.h"
#include "QtWidgets/qgraphicsview.h"
#include <private/qgesture_p.h>

#ifdef Q_WS_WIN
#include "QtCore/qt_windows.h"
#include <private/qdnd_p.h>
#endif // Q_WS_WIN

#ifdef Q_WS_X11
#include "QtGui/qx11info_x11.h"
#endif

#ifdef Q_WS_MAC
#include <private/qt_mac_p.h>
#endif

#if defined(Q_WS_QWS)
#include "QtWidgets/qinputcontext.h"
#include "QtGui/qscreen_qws.h"
#endif

#if defined(Q_OS_SYMBIAN)
class RDrawableWindow;
class CCoeControl;
#endif

QT_BEGIN_NAMESPACE

// Extra QWidget data
//  - to minimize memory usage for members that are seldom used.
//  - top-level widgets have extra extra data to reduce cost further
#if defined(Q_WS_QWS)
class QWSManager;
#endif
#if defined(Q_WS_MAC)
class QCoreGraphicsPaintEnginePrivate;
#endif
#if defined(Q_WS_QPA)
class QWidgetWindow;
#endif
class QPaintEngine;
class QPixmap;
class QWidgetBackingStore;
class QGraphicsProxyWidget;
class QWidgetItemV2;

class QStyle;

class QUnifiedToolbarSurface;

class Q_AUTOTEST_EXPORT QWidgetBackingStoreTracker
{

public:
    QWidgetBackingStoreTracker();
    ~QWidgetBackingStoreTracker();

    void create(QWidget *tlw);
    void destroy();

    void registerWidget(QWidget *w);
    void unregisterWidget(QWidget *w);
    void unregisterWidgetSubtree(QWidget *w);

    inline QWidgetBackingStore* data()
    {
        return m_ptr;
    }

    inline QWidgetBackingStore* operator->()
    {
        return m_ptr;
    }

    inline QWidgetBackingStore& operator*()
    {
        return *m_ptr;
    }

    inline operator bool() const
    {
        return (0 != m_ptr);
    }

private:
    Q_DISABLE_COPY(QWidgetBackingStoreTracker)

private:
    QWidgetBackingStore* m_ptr;
    QSet<QWidget *> m_widgets;
};

struct QTLWExtra {
    // *************************** Cross-platform variables *****************************

    // Regular pointers (keep them together to avoid gaps on 64 bits architectures).
    QIcon *icon; // widget icon
    QPixmap *iconPixmap;
    QWidgetBackingStoreTracker backingStore;
    QWindowSurface *windowSurface;
    QPainter *sharedPainter;

    // Implicit pointers (shared_null).
    QString caption; // widget caption
    QString iconText; // widget icon text
    QString role; // widget role
    QString filePath; // widget file path

    // Other variables.
    short incw, inch; // size increments
    short basew, baseh; // base sizes
     // frame strut, don't use these directly, use QWidgetPrivate::frameStrut() instead.
    QRect frameStrut;
    QRect normalGeometry; // used by showMin/maximized/FullScreen
    Qt::WindowFlags savedFlags; // Save widget flags while showing fullscreen

    // *************************** Cross-platform bit fields ****************************
    uint opacity : 8;
    uint posFromMove : 1;
    uint sizeAdjusted : 1;
    uint inTopLevelResize : 1;
    uint inRepaint : 1;
    uint embedded : 1;

    // *************************** Platform specific values (bit fields first) **********
#if defined(Q_WS_X11) // <----------------------------------------------------------- X11
    uint spont_unmapped: 1; // window was spontaneously unmapped
    uint dnd : 1; // DND properties installed
    uint validWMState : 1; // is WM_STATE valid?
    uint waitingForMapNotify : 1; // show() has been called, haven't got the MapNotify yet
    WId parentWinId; // parent window Id (valid after reparenting)
    WId userTimeWindow; // window id that contains user-time timestamp when WM supports a _NET_WM_USER_TIME_WINDOW atom
    QPoint fullScreenOffset;
#ifndef QT_NO_XSYNC
    WId syncUpdateCounter;
    ulong syncRequestTimestamp;
    qint32 newCounterValueHi;
    quint32 newCounterValueLo;
#endif
#elif defined(Q_WS_WIN) // <--------------------------------------------------------- WIN
    uint hotkeyRegistered: 1; // Hot key from the STARTUPINFO has been registered.
    HICON winIconBig; // internal big Windows icon
    HICON winIconSmall; // internal small Windows icon
#elif defined(Q_WS_MAC) // <--------------------------------------------------------- MAC
    uint resizer : 4;
    uint isSetGeometry : 1;
    uint isMove : 1;
    quint32 wattr;
    quint32 wclass;
    WindowGroupRef group;
    IconRef windowIcon; // the current window icon, if set with setWindowIcon_sys.
    quint32 savedWindowAttributesFromMaximized; // Saved attributes from when the calling updateMaximizeButton_sys()
#ifdef QT_MAC_USE_COCOA
    // This value is just to make sure we maximize and restore to the right location, yet we allow apps to be maximized and
    // manually resized.
    // The name is misleading, since this is set when maximizing the window. It is a hint to saveGeometry(..) to record the
    // starting position as 0,0 instead of the normal starting position.
    bool wasMaximized;
#endif // QT_MAC_USE_COCOA

#elif defined(Q_WS_QWS) // <--------------------------------------------------------- QWS
#ifndef QT_NO_QWS_MANAGER
    QWSManager *qwsManager;
#endif
#elif defined(Q_OS_SYMBIAN)
    uint inExpose : 1; // Prevents drawing recursion
    uint nativeWindowTransparencyEnabled : 1; // Tracks native window transparency
#elif defined(Q_WS_QPA)
    QWidgetWindow *window;
    quint32 screenIndex; // index in qplatformscreenlist
#endif
};

struct QWExtra {
    // *************************** Cross-platform variables *****************************

    // Regular pointers (keep them together to avoid gaps on 64 bits architectures).
    void *glContext; // if the widget is hijacked by QGLWindowSurface
    QTLWExtra *topextra; // only useful for TLWs
#ifndef QT_NO_GRAPHICSVIEW
    QGraphicsProxyWidget *proxyWidget; // if the widget is embedded
#endif
#ifndef QT_NO_CURSOR
    QCursor *curs;
#endif
    QPointer<QStyle> style;
    QPointer<QWidget> focus_proxy;

    // Implicit pointers (shared_empty/shared_null).
    QRegion mask; // widget mask
    QString styleSheet;

    // Other variables.
    qint32 minw;
    qint32 minh; // minimum size
    qint32 maxw;
    qint32 maxh; // maximum size
    quint16 customDpiX;
    quint16 customDpiY;
    QSize staticContentsSize;

    // *************************** Cross-platform bit fields ****************************
    uint explicitMinSize : 2;
    uint explicitMaxSize : 2;
    uint autoFillBackground : 1;
    uint nativeChildrenForced : 1;
    uint inRenderWithPainter : 1;
    uint hasMask : 1;

    // *************************** Platform specific values (bit fields first) **********
#if defined(Q_WS_WIN) // <----------------------------------------------------------- WIN
#ifndef QT_NO_DRAGANDDROP
    QOleDropTarget *dropTarget; // drop target
    QList<QPointer<QWidget> > oleDropWidgets;
#endif
#elif defined(Q_WS_X11) // <--------------------------------------------------------- X11
    uint compress_events : 1;
    WId xDndProxy; // XDND forwarding to embedded windows
#elif defined(Q_WS_MAC) // <------------------------------------------------------ MAC
#ifdef QT_MAC_USE_COCOA
    // Cocoa Mask stuff
    QImage maskBits;
    CGImageRef imageMask;
#endif
#elif defined(Q_OS_SYMBIAN) // <----------------------------------------------------- Symbian
    uint activated : 1; // RWindowBase::Activated has been called

    /**
     * If this bit is set, each native widget receives the signals from the
     * Symbian control immediately before and immediately after draw ops are
     * sent to the window server for this control:
     *      void beginNativePaintEvent(const QRect &paintRect);
     *      void endNativePaintEvent(const QRect &paintRect);
     */
    uint receiveNativePaintEvents : 1;

    /**
     * Defines the behaviour of QSymbianControl::Draw.
     */
    enum NativePaintMode {
        /**
         * Normal drawing mode: blits the required region of the backing store
         * via WSERV.
         */
        Blit,

        /**
         * Disable drawing for this widget.
         */
        Disable,

        /**
         * Paint zeros into the WSERV framebuffer, using BitGDI APIs.  For windows
         * with an EColor16MU display mode, zero is written only into the R, G and B
         * channels of the pixel.
         */
        ZeroFill,

        /**
         * Blit backing store, propagating alpha channel into the framebuffer.
         */
        BlitWriteAlpha,

        Default = Blit
    };

    NativePaintMode nativePaintMode;

#endif
};

/*!
    \internal

    Returns true if \a p or any of its parents enable the
    Qt::BypassGraphicsProxyWidget window flag. Used in QWidget::show() and
    QWidget::setParent() to determine whether it's necessary to embed the
    widget into a QGraphicsProxyWidget or not.
*/
static inline bool bypassGraphicsProxyWidget(const QWidget *p)
{
    while (p) {
        if (p->windowFlags() & Qt::BypassGraphicsProxyWidget)
            return true;
        p = p->parentWidget();
    }
    return false;
}

class Q_GUI_EXPORT QWidgetPrivate : public QObjectPrivate
{
    Q_DECLARE_PUBLIC(QWidget)

public:
    // *************************** Cross-platform ***************************************
    enum DrawWidgetFlags {
        DrawAsRoot = 0x01,
        DrawPaintOnScreen = 0x02,
        DrawRecursive = 0x04,
        DrawInvisible = 0x08,
        DontSubtractOpaqueChildren = 0x10,
        DontSetCompositionMode = 0x20,
        DontDrawOpaqueChildren = 0x40,
        DontDrawNativeChildren = 0x80
    };

    enum CloseMode {
        CloseNoEvent,
        CloseWithEvent,
        CloseWithSpontaneousEvent
    };

    enum Direction {
        DirectionNorth = 0x01,
        DirectionEast = 0x10,
        DirectionSouth = 0x02,
        DirectionWest = 0x20
    };

    // Functions.
    explicit QWidgetPrivate(int version = QObjectPrivateVersion);
    ~QWidgetPrivate();

    QWExtra *extraData() const;
    QTLWExtra *topData() const;
    QTLWExtra *maybeTopData() const;
    QPainter *sharedPainter() const;
    void setSharedPainter(QPainter *painter);
    QWidgetBackingStore *maybeBackingStore() const;
    void init(QWidget *desktopWidget, Qt::WindowFlags f);
    void create_sys(WId window, bool initializeWindow, bool destroyOldWindow);
    void createRecursively();
    void createWinId(WId id = 0);

    void createTLExtra();
    void createExtra();
    void deleteExtra();
    void createSysExtra();
    void deleteSysExtra();
    void createTLSysExtra();
    void deleteTLSysExtra();
    void updateSystemBackground();
    void propagatePaletteChange();

    void setPalette_helper(const QPalette &);
    void resolvePalette();
    QPalette naturalWidgetPalette(uint inheritedMask) const;

    void setMask_sys(const QRegion &);
#ifdef Q_OS_SYMBIAN
    void setSoftKeys_sys(const QList<QAction*> &softkeys);
    void activateSymbianWindow(WId wid = 0);
    void _q_delayedDestroy(WId winId);
#endif

    void raise_sys();
    void lower_sys();
    void stackUnder_sys(QWidget *);

    void setFocus_sys();

    void updateFont(const QFont &);
    inline void setFont_helper(const QFont &font) {
        if (data.fnt == font && data.fnt.resolve() == font.resolve())
            return;
        updateFont(font);
    }
    void resolveFont();
    QFont naturalWidgetFont(uint inheritedMask) const;

    void setLayoutDirection_helper(Qt::LayoutDirection);
    void resolveLayoutDirection();

    void setLocale_helper(const QLocale &l, bool forceUpdate = false);
    void resolveLocale();

    void setStyle_helper(QStyle *newStyle, bool propagate, bool metalHack = false);
    void inheritStyle();

    void setUpdatesEnabled_helper(bool );

    void paintBackground(QPainter *, const QRegion &, int flags = DrawAsRoot) const;
    bool isAboutToShow() const;
    QRegion prepareToRender(const QRegion &region, QWidget::RenderFlags renderFlags);
    void render_helper(QPainter *painter, const QPoint &targetOffset, const QRegion &sourceRegion,
                       QWidget::RenderFlags renderFlags);
    void render(QPaintDevice *target, const QPoint &targetOffset, const QRegion &sourceRegion,
                QWidget::RenderFlags renderFlags, bool readyToRender);
    void drawWidget(QPaintDevice *pdev, const QRegion &rgn, const QPoint &offset, int flags,
                    QPainter *sharedPainter = 0, QWidgetBackingStore *backingStore = 0);


    void paintSiblingsRecursive(QPaintDevice *pdev, const QObjectList& children, int index,
                                const QRegion &rgn, const QPoint &offset, int flags
#ifdef Q_BACKINGSTORE_SUBSURFACES
                                , const QWindowSurface *currentSurface
#endif
                                , QPainter *sharedPainter, QWidgetBackingStore *backingStore);


    QPainter *beginSharedPainter();
    bool endSharedPainter();
#ifndef QT_NO_GRAPHICSVIEW
    static QGraphicsProxyWidget * nearestGraphicsProxyWidget(const QWidget *origin);
#endif
    QWindowSurface *createDefaultWindowSurface();
    QWindowSurface *createDefaultWindowSurface_sys();
    void repaint_sys(const QRegion &rgn);

    QRect clipRect() const;
    QRegion clipRegion() const;
    void subtractOpaqueChildren(QRegion &rgn, const QRect &clipRect) const;
    void subtractOpaqueSiblings(QRegion &source, bool *hasDirtySiblingsAbove = 0,
                                bool alsoNonOpaque = false) const;
    void clipToEffectiveMask(QRegion &region) const;
    void updateIsOpaque();
    void setOpaque(bool opaque);
    void updateIsTranslucent();
    bool paintOnScreen() const;
#ifndef QT_NO_GRAPHICSEFFECT
    void invalidateGraphicsEffectsRecursively();
#endif //QT_NO_GRAPHICSEFFECT

    const QRegion &getOpaqueChildren() const;
    void setDirtyOpaqueRegion();

    bool close_helper(CloseMode mode);

    void setWindowIcon_helper();
    void setWindowIcon_sys(bool forceReset = false);
    void setWindowOpacity_sys(qreal opacity);
    void adjustQuitOnCloseAttribute();

    void scrollChildren(int dx, int dy);
    void moveRect(const QRect &, int dx, int dy);
    void scrollRect(const QRect &, int dx, int dy);
    void invalidateBuffer_resizeHelper(const QPoint &oldPos, const QSize &oldSize);
    // ### Qt 4.6: Merge into a template function (after MSVC isn't supported anymore).
    void invalidateBuffer(const QRegion &);
    void invalidateBuffer(const QRect &);
    bool isOverlapped(const QRect&) const;
    void syncBackingStore();
    void syncBackingStore(const QRegion &region);

    void reparentFocusWidgets(QWidget *oldtlw);

    static int pointToRect(const QPoint &p, const QRect &r);

    void setWinId(WId);
    void showChildren(bool spontaneous);
    void hideChildren(bool spontaneous);
    void setParent_sys(QWidget *parent, Qt::WindowFlags);
    void scroll_sys(int dx, int dy);
    void scroll_sys(int dx, int dy, const QRect &r);
    void deactivateWidgetCleanup();
    void setGeometry_sys(int, int, int, int, bool);
    void sendPendingMoveAndResizeEvents(bool recursive = false, bool disableUpdates = false);
    void activateChildLayoutsRecursively();
    void show_recursive();
    void show_helper();
    void show_sys();
    void hide_sys();
    void hide_helper();
    void _q_showIfNotHidden();

    void setEnabled_helper(bool);
    void registerDropSite(bool);
    static void adjustFlags(Qt::WindowFlags &flags, QWidget *w = 0);

    void updateFrameStrut();
    QRect frameStrut() const;

#ifdef QT_KEYPAD_NAVIGATION
    static bool navigateToDirection(Direction direction);
    static QWidget *widgetInNavigationDirection(Direction direction);
    static bool canKeypadNavigate(Qt::Orientation orientation);
    static bool inTabWidget(QWidget *widget);
#endif

    void setWindowIconText_sys(const QString &cap);
    void setWindowIconText_helper(const QString &cap);
    void setWindowTitle_sys(const QString &cap);

#ifndef QT_NO_CURSOR
    void setCursor_sys(const QCursor &cursor);
    void unsetCursor_sys();
#endif

    void setWindowTitle_helper(const QString &cap);
    void setWindowFilePath_helper(const QString &filePath);

    bool setMinimumSize_helper(int &minw, int &minh);
    bool setMaximumSize_helper(int &maxw, int &maxh);
    virtual bool hasHeightForWidth() const;
    void setConstraints_sys();
    bool pointInsideRectAndMask(const QPoint &) const;
    QWidget *childAt_helper(const QPoint &, bool) const;
    QWidget *childAtRecursiveHelper(const QPoint &p, bool, bool includeFrame = false) const;
    void updateGeometry_helper(bool forceUpdate);

    void getLayoutItemMargins(int *left, int *top, int *right, int *bottom) const;
    void setLayoutItemMargins(int left, int top, int right, int bottom);
    void setLayoutItemMargins(QStyle::SubElement element, const QStyleOption *opt = 0);

    // aboutToDestroy() is called just before the contents of
    // QWidget::destroy() is executed. It's used to signal QWidget
    // sub-classes that their internals are about to be released.
    virtual void aboutToDestroy() {}

    QInputContext *assignedInputContext() const;
    QInputContext *inputContext() const;
    inline QWidget *effectiveFocusWidget() {
        QWidget *w = q_func();
        while (w->focusProxy())
            w = w->focusProxy();
        return w;
    }

    void setModal_sys();

    // This is an helper function that return the available geometry for
    // a widget and takes care is this one is in QGraphicsView.
    // If the widget is not embed in a scene then the geometry available is
    // null, we let QDesktopWidget decide for us.
    static QRect screenGeometry(const QWidget *widget)
    {
        QRect screen;
#ifndef QT_NO_GRAPHICSVIEW
        QGraphicsProxyWidget *ancestorProxy = widget->d_func()->nearestGraphicsProxyWidget(widget);
        //It's embedded if it has an ancestor
        if (ancestorProxy) {
            if (!bypassGraphicsProxyWidget(widget) && ancestorProxy->scene() != 0) {
                // One view, let be smart and return the viewport rect then the popup is aligned
                if (ancestorProxy->scene()->views().size() == 1) {
                    QGraphicsView *view = ancestorProxy->scene()->views().at(0);
                    screen = view->mapToScene(view->viewport()->rect()).boundingRect().toRect();
                } else {
                    screen = ancestorProxy->scene()->sceneRect().toRect();
                }
            }
        }
#endif
        return screen;
    }

    inline void setRedirected(QPaintDevice *replacement, const QPoint &offset)
    {
        Q_ASSERT(q_func()->testAttribute(Qt::WA_WState_InPaintEvent));
        redirectDev = replacement;
        redirectOffset = offset;
    }

    inline QPaintDevice *redirected(QPoint *offset) const
    {
        if (offset)
            *offset = redirectDev ? redirectOffset : QPoint();
        return redirectDev;
    }

    inline void restoreRedirected()
    { redirectDev = 0; }

    inline void enforceNativeChildren()
    {
        if (!extra)
            createExtra();

        if (extra->nativeChildrenForced)
            return;
        extra->nativeChildrenForced = 1;

        for (int i = 0; i < children.size(); ++i) {
            if (QWidget *child = qobject_cast<QWidget *>(children.at(i)))
                child->setAttribute(Qt::WA_NativeWindow);
        }
    }

    inline bool nativeChildrenForced() const
    {
        return extra ? extra->nativeChildrenForced : false;
    }

    inline QRect effectiveRectFor(const QRect &rect) const
    {
#ifndef QT_NO_GRAPHICSEFFECT
        if (graphicsEffect && graphicsEffect->isEnabled())
            return graphicsEffect->boundingRectFor(rect).toAlignedRect();
#endif //QT_NO_GRAPHICSEFFECT
        return rect;
    }

    QSize adjustedSize() const;

    inline void handleSoftwareInputPanel(Qt::MouseButton button, bool clickCausedFocus)
    {
        Q_Q(QWidget);
        if (button == Qt::LeftButton && qApp->autoSipEnabled()) {
            QStyle::RequestSoftwareInputPanel behavior = QStyle::RequestSoftwareInputPanel(
                    q->style()->styleHint(QStyle::SH_RequestSoftwareInputPanel));
            if (!clickCausedFocus || behavior == QStyle::RSIP_OnMouseClick) {
                QEvent event(QEvent::RequestSoftwareInputPanel);
                QApplication::sendEvent(q, &event);
            }
        }
    }

#ifndef Q_WS_QWS // Almost cross-platform :-)
    void setWSGeometry(bool dontShow=false, const QRect &oldRect = QRect());

    inline QPoint mapToWS(const QPoint &p) const
    { return p - data.wrect.topLeft(); }

    inline QPoint mapFromWS(const QPoint &p) const
    { return p + data.wrect.topLeft(); }

    inline QRect mapToWS(const QRect &r) const
    { QRect rr(r); rr.translate(-data.wrect.topLeft()); return rr; }

    inline QRect mapFromWS(const QRect &r) const
    { QRect rr(r); rr.translate(data.wrect.topLeft()); return rr; }
#endif

    // Variables.
    // Regular pointers (keep them together to avoid gaps on 64 bit architectures).
    QWExtra *extra;
    QWidget *focus_next;
    QWidget *focus_prev;
    QWidget *focus_child;
    QLayout *layout;
    QRegion *needsFlush;
    QPaintDevice *redirectDev;
    QWidgetItemV2 *widgetItem;
    QPaintEngine *extraPaintEngine;
    mutable const QMetaObject *polished;
    QGraphicsEffect *graphicsEffect;
    // All widgets are added into the allWidgets set. Once
    // they receive a window id they are also added to the mapper.
    // This should just ensure that all widgets are deleted by QApplication
    static QWidgetMapper *mapper;
    static QWidgetSet *allWidgets;
#if !defined(QT_NO_IM)
    QPointer<QInputContext> ic;
    Qt::InputMethodHints imHints;
#endif
#ifdef QT_KEYPAD_NAVIGATION
    static QPointer<QWidget> editingWidget;
#endif

    // Implicit pointers (shared_null/shared_empty).
    QRegion opaqueChildren;
    QRegion dirty;
#ifndef QT_NO_TOOLTIP
    QString toolTip;
#endif
#ifndef QT_NO_STATUSTIP
    QString statusTip;
#endif
#ifndef QT_NO_WHATSTHIS
    QString whatsThis;
#endif
#ifndef QT_NO_ACCESSIBILITY
    QString accessibleName;
    QString accessibleDescription;
#endif

    // Other variables.
    uint inheritedFontResolveMask;
    uint inheritedPaletteResolveMask;
    short leftmargin;
    short topmargin;
    short rightmargin;
    short bottommargin;
    signed char leftLayoutItemMargin;
    signed char topLayoutItemMargin;
    signed char rightLayoutItemMargin;
    signed char bottomLayoutItemMargin;
    static int instanceCounter; // Current number of widget instances
    static int maxInstances; // Maximum number of widget instances
    Qt::HANDLE hd;
    QWidgetData data;
    QSizePolicy size_policy;
    QLocale locale;
    QPoint redirectOffset;
#ifndef QT_NO_ACTION
    QList<QAction*> actions;
#endif
#ifndef QT_NO_GESTURES
    QMap<Qt::GestureType, Qt::GestureFlags> gestureContext;
#endif

    // Bit fields.
    uint high_attributes[4]; // the low ones are in QWidget::widget_attributes
    QPalette::ColorRole fg_role : 8;
    QPalette::ColorRole bg_role : 8;
    uint dirtyOpaqueChildren : 1;
    uint isOpaque : 1;
    uint inDirtyList : 1;
    uint isScrolled : 1;
    uint isMoved : 1;
    uint isGLWidget : 1;
    uint usesDoubleBufferedGLContext : 1;
#ifndef QT_NO_IM
    uint inheritsInputMethodHints : 1;
#endif

    // *************************** Platform specific ************************************
#if defined(Q_WS_X11) // <----------------------------------------------------------- X11
    QX11Info xinfo;
    Qt::HANDLE picture;
    static QWidget *mouseGrabber;
    static QWidget *keyboardGrabber;

    void setWindowRole();
    void sendStartupMessage(const char *message) const;
    void setNetWmWindowTypes();
    void x11UpdateIsOpaque();
    bool isBackgroundInherited() const;
    void updateX11AcceptFocus();
    QPoint mapToGlobal(const QPoint &pos) const;
    QPoint mapFromGlobal(const QPoint &pos) const;
#elif defined(Q_WS_WIN) // <--------------------------------------------------------- WIN
    uint noPaintOnScreen : 1; // see qwidget_win.cpp ::paintEngine()
#ifndef QT_NO_GESTURES
    uint nativeGesturePanEnabled : 1;
#endif
    bool shouldShowMaximizeButton();
    void winUpdateIsOpaque();
    void reparentChildren();
#ifndef QT_NO_DRAGANDDROP
    QOleDropTarget *registerOleDnd(QWidget *widget);
    void unregisterOleDnd(QWidget *widget, QOleDropTarget *target);
#endif
    void grabMouseWhileInWindow();
    void registerTouchWindow();
    void winSetupGestures();
#elif defined(Q_WS_MAC) // <--------------------------------------------------------- MAC
    // This is new stuff
    uint needWindowChange : 1;

    // Each wiget keeps a list of all its child and grandchild OpenGL widgets.
    // This list is used to update the gl context whenever a parent and a granparent
    // moves, and also to check for intersections with gl widgets within the window
    // when a widget moves.
    struct GlWidgetInfo
    {
        GlWidgetInfo(QWidget *widget) : widget(widget), lastUpdateWidget(0) { }
        bool operator==(const GlWidgetInfo &other) const { return (widget == other.widget); }
        QWidget * widget;
        QWidget * lastUpdateWidget;
    };

    // dirtyOnWidget contains the areas in the widget that needs to be repained,
    // in the same way as dirtyOnScreen does for the window. Areas are added in
    // dirtyWidget_sys and cleared in the paint event. In scroll_sys we then use
    // this information repaint invalid areas when widgets are scrolled.
    QRegion dirtyOnWidget;
    EventHandlerRef window_event;
    QList<GlWidgetInfo> glWidgets;

    //these are here just for code compat (HIViews)
    Qt::HANDLE qd_hd;

    void macUpdateSizeAttribute();
    void macUpdateHideOnSuspend();
    void macUpdateOpaqueSizeGrip();
    void macUpdateIgnoreMouseEvents();
    void macUpdateMetalAttribute();
    void macUpdateIsOpaque();
    void macSetNeedsDisplay(QRegion region);
    void setEnabled_helper_sys(bool enable);
    bool isRealWindow() const;
    void adjustWithinMaxAndMinSize(int &w, int &h);
    void applyMaxAndMinSizeOnWindow();
    void update_sys(const QRect &rect);
    void update_sys(const QRegion &rgn);
    void setGeometry_sys_helper(int, int, int, int, bool);
    void setWindowModified_sys(bool b);
    void updateMaximizeButton_sys();
    void setWindowFilePath_sys(const QString &filePath);
    void createWindow_sys();
    void recreateMacWindow();
#ifndef QT_MAC_USE_COCOA
    void initWindowPtr();
    void finishCreateWindow_sys_Carbon(OSWindowRef windowRef);
#else
    void setSubWindowStacking(bool set);
    void setWindowLevel();
    void finishCreateWindow_sys_Cocoa(void * /*NSWindow * */ windowRef);
    void syncCocoaMask();
    void finishCocoaMaskSetup();
    void syncUnifiedMode();
    // Did we add the drawRectOriginal method?
    bool drawRectOriginalAdded;
    // Is the original drawRect method available?
    bool originalDrawMethod;
    // Do we need to change the methods?
    bool changeMethods;

    // Unified toolbar variables
    bool isInUnifiedToolbar;
    QUnifiedToolbarSurface *unifiedSurface;
    QPoint toolbar_offset;
    QWidget *toolbar_ancestor;
    bool flushRequested;
    bool touchEventsEnabled;
#endif // QT_MAC_USE_COCOA
    void determineWindowClass();
    void transferChildren();
    bool qt_mac_dnd_event(uint, DragRef);
    void toggleDrawers(bool);
    //mac event functions
    static bool qt_create_root_win();
    static void qt_clean_root_win();
    static bool qt_mac_update_sizer(QWidget *, int up = 0);
    static OSStatus qt_window_event(EventHandlerCallRef er, EventRef event, void *);
    static OSStatus qt_widget_event(EventHandlerCallRef er, EventRef event, void *);
    static bool qt_widget_rgn(QWidget *, short, RgnHandle, bool);
    void registerTouchWindow(bool enable = true);
#elif defined(Q_WS_QWS) // <--------------------------------------------------------- QWS
    void setMaxWindowState_helper();
    void setFullScreenSize_helper();
    void moveSurface(QWindowSurface *surface, const QPoint &offset);
    QRegion localRequestedRegion() const;
    QRegion localAllocatedRegion() const;

    friend class QWSManager;
    friend class QWSManagerPrivate;
    friend class QDecoration;
#ifndef QT_NO_CURSOR
    void updateCursor() const;
#endif
    QScreen* getScreen() const;
#elif defined(Q_WS_QPA) // <--------------------------------------------------------- QPA
    void setMaxWindowState_helper();
    void setFullScreenSize_helper();
#ifndef QT_NO_CURSOR
    void updateCursor() const;
#endif
#elif defined(Q_OS_SYMBIAN) // <--------------------------------------------------------- SYMBIAN
    static QWidget *mouseGrabber;
    static QWidget *keyboardGrabber;
    int symbianScreenNumber; // only valid for desktop widget and top-levels
    bool fixNativeOrientationCalled;
    void s60UpdateIsOpaque();
    void reparentChildren();
    void registerTouchWindow();
#endif

};

struct QWidgetPaintContext
{
    inline QWidgetPaintContext(QPaintDevice *d, const QRegion &r, const QPoint &o, int f,
                               QPainter *p, QWidgetBackingStore *b)
        : pdev(d), rgn(r), offset(o), flags(f), sharedPainter(p), backingStore(b), painter(0) {}

    QPaintDevice *pdev;
    QRegion rgn;
    QPoint offset;
    int flags;
    QPainter *sharedPainter;
    QWidgetBackingStore *backingStore;
    QPainter *painter;
};

#ifndef QT_NO_GRAPHICSEFFECT
class QWidgetEffectSourcePrivate : public QGraphicsEffectSourcePrivate
{
public:
    QWidgetEffectSourcePrivate(QWidget *widget)
        : QGraphicsEffectSourcePrivate(), m_widget(widget), context(0), updateDueToGraphicsEffect(false)
    {}

    inline void detach()
    { m_widget->d_func()->graphicsEffect = 0; }

    inline const QGraphicsItem *graphicsItem() const
    { return 0; }

    inline const QWidget *widget() const
    { return m_widget; }

    inline void update()
    {
        updateDueToGraphicsEffect = true;
        m_widget->update();
        updateDueToGraphicsEffect = false;
    }

    inline bool isPixmap() const
    { return false; }

    inline void effectBoundingRectChanged()
    {
        // ### This function should take a rect parameter; then we can avoid
        // updating too much on the parent widget.
        if (QWidget *parent = m_widget->parentWidget())
            parent->update();
        else
            update();
    }

    inline const QStyleOption *styleOption() const
    { return 0; }

    inline QRect deviceRect() const
    { return m_widget->window()->rect(); }

    QRectF boundingRect(Qt::CoordinateSystem system) const;
    void draw(QPainter *p);
    QPixmap pixmap(Qt::CoordinateSystem system, QPoint *offset,
                   QGraphicsEffect::PixmapPadMode mode) const;

    QWidget *m_widget;
    QWidgetPaintContext *context;
    QTransform lastEffectTransform;
    bool updateDueToGraphicsEffect;
};
#endif //QT_NO_GRAPHICSEFFECT

inline QWExtra *QWidgetPrivate::extraData() const
{
    return extra;
}

inline QTLWExtra *QWidgetPrivate::topData() const
{
    const_cast<QWidgetPrivate *>(this)->createTLExtra();
    return extra->topextra;
}

inline QTLWExtra *QWidgetPrivate::maybeTopData() const
{
    return extra ? extra->topextra : 0;
}

inline QPainter *QWidgetPrivate::sharedPainter() const
{
    Q_Q(const QWidget);
    QTLWExtra *x = q->window()->d_func()->maybeTopData();
    return x ? x->sharedPainter : 0;
}

inline void QWidgetPrivate::setSharedPainter(QPainter *painter)
{
    Q_Q(QWidget);
    QTLWExtra *x = q->window()->d_func()->topData();
    x->sharedPainter = painter;
}

inline bool QWidgetPrivate::pointInsideRectAndMask(const QPoint &p) const
{
    Q_Q(const QWidget);
    return q->rect().contains(p) && (!extra || !extra->hasMask || q->testAttribute(Qt::WA_MouseNoMask)
                                     || extra->mask.contains(p));
}

inline QWidgetBackingStore *QWidgetPrivate::maybeBackingStore() const
{
    Q_Q(const QWidget);
    QTLWExtra *x = q->window()->d_func()->maybeTopData();
    return x ? x->backingStore.data() : 0;
}

QT_END_NAMESPACE

#endif // QWIDGET_P_H