source: branches/4.5.1/src/gui/kernel/qwidget_p.h

Last change on this file was 309, checked in by Dmitry A. Kuminov, 16 years ago

gui: Implemented setting window icons for top-level windows with QWidget::setWindowIcon() (closes #55).
File size: 22.2 KB
Line 
1/****************************************************************************
2**
3** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
4** Contact: Qt Software Information (qt-info@nokia.com)
5**
6** This file is part of the QtGui module of the Qt Toolkit.
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41
42#ifndef QWIDGET_P_H
43#define QWIDGET_P_H
44
45//
46// W A R N I N G
47// -------------
48//
49// This file is not part of the Qt API. It exists for the convenience
50// of qapplication_*.cpp, qwidget*.cpp and qfiledialog.cpp. This header
51// file may change from version to version without notice, or even be removed.
52//
53// We mean it.
54//
55
56#include "QtGui/qwidget.h"
57#include "private/qobject_p.h"
58#include "QtCore/qrect.h"
59#include "QtCore/qlocale.h"
60#include "QtGui/qregion.h"
61#include "QtGui/qsizepolicy.h"
62#include "QtGui/qstyle.h"
63
64#ifdef Q_WS_WIN
65#include "QtCore/qt_windows.h"
66#include <private/qdnd_p.h>
67#endif // Q_WS_WIN
68
69#ifdef Q_WS_PM
70#include "QtCore/qt_os2.h"
71#endif
72
73#ifdef Q_WS_X11
74#include "QtGui/qx11info_x11.h"
75#endif
76
77#ifdef Q_WS_MAC
78#include <private/qt_mac_p.h>
79#endif
80
81#if defined(Q_WS_QWS)
82#include "QtGui/qinputcontext.h"
83#include "QtGui/qscreen_qws.h"
84#endif
85
86QT_BEGIN_NAMESPACE
87
88// Extra QWidget data
89// - to minimize memory usage for members that are seldom used.
90// - top-level widgets have extra extra data to reduce cost further
91#if defined(Q_WS_QWS)
92class QWSManager;
93#endif
94#if defined(Q_WS_MAC)
95class QCoreGraphicsPaintEnginePrivate;
96#endif
97class QPaintEngine;
98class QPixmap;
99class QWidgetBackingStore;
100class QGraphicsProxyWidget;
101class QWidgetItemV2;
102
103class QStyle;
104
105struct QTLWExtra {
106 QString caption; // widget caption
107 QString iconText; // widget icon text
108 QString role; // widget role
109 QString filePath; // widget file path
110 QIcon *icon; // widget icon
111 QPixmap *iconPixmap;
112 short incw, inch; // size increments
113 // frame strut, don't use these directly, use QWidgetPrivate::frameStrut() instead.
114 QRect frameStrut;
115 uint opacity : 8;
116 uint posFromMove : 1;
117 uint sizeAdjusted : 1;
118 uint inTopLevelResize : 1;
119 uint inRepaint : 1;
120 QWidgetBackingStore *backingStore;
121#if defined(Q_WS_WIN)
122 ulong savedFlags; // Save window flags while showing fullscreen
123 uint embedded : 1; // window is embedded in another application
124#else
125 Qt::WindowFlags savedFlags; // Save widget flags while showing fullscreen
126#endif
127 short basew, baseh; // base sizes
128#if defined(Q_WS_X11)
129 WId parentWinId; // parent window Id (valid after reparenting)
130 uint embedded : 1; // window is embedded in another Qt application
131 uint spont_unmapped: 1; // window was spontaneously unmapped
132 uint dnd : 1; // DND properties installed
133 uint validWMState : 1; // is WM_STATE valid?
134 uint waitingForMapNotify : 1; // show() has been called, haven't got the MapNotify yet
135 WId userTimeWindow; // window id that contains user-time timestamp when WM supports a _NET_WM_USER_TIME_WINDOW atom
136 QPoint fullScreenOffset;
137#endif
138#if defined(Q_WS_MAC)
139 quint32 wattr;
140 quint32 wclass;
141 WindowGroupRef group;
142 IconRef windowIcon; // the current window icon, if set with setWindowIcon_sys.
143 quint32 savedWindowAttributesFromMaximized; // Saved attributes from when the calling updateMaximizeButton_sys()
144 uint resizer : 4;
145 uint isSetGeometry : 1;
146 uint isMove : 1;
147 uint embedded : 1;
148#endif
149#if defined(Q_WS_QWS) && !defined (QT_NO_QWS_MANAGER)
150 QWSManager *qwsManager;
151#endif
152#if defined(Q_WS_WIN)
153 HICON winIconBig; // internal big Windows icon
154 HICON winIconSmall; // internal small Windows icon
155#endif
156#if defined(Q_WS_PM)
157 HWND fId;
158 HSWITCH swEntry;
159 HPOINTER iconPointer;
160#endif
161 QRect normalGeometry; // used by showMin/maximized/FullScreen
162 QWindowSurface *windowSurface;
163 QPainter *sharedPainter;
164};
165
166struct QWExtra {
167 qint32 minw, minh; // minimum size
168 qint32 maxw, maxh; // maximum size
169 QPointer<QWidget> focus_proxy;
170#ifndef QT_NO_CURSOR
171 QCursor *curs;
172#endif
173 QTLWExtra *topextra; // only useful for TLWs
174 QGraphicsProxyWidget *proxyWidget; // if the widget is embedded
175 void *glContext; // if the widget is hijacked by QGLWindowSurface
176#if defined(Q_WS_WIN) && !defined(QT_NO_DRAGANDDROP)
177 QOleDropTarget *dropTarget; // drop target
178 QList<QPointer<QWidget> > oleDropWidgets;
179#endif
180#if defined(Q_WS_X11)
181 WId xDndProxy; // XDND forwarding to embedded windows
182#endif
183 QRegion mask; // widget mask
184 QSize staticContentsSize;
185
186//bit flags at the end to improve packing
187#if defined(Q_WS_WIN)
188 uint shown_mode : 8; // widget show mode
189#ifndef QT_NO_DIRECT3D
190 uint had_paint_on_screen : 1;
191 uint had_no_system_bg : 1;
192 uint had_auto_fill_bg : 1;
193#endif
194#endif
195#if defined(Q_WS_X11)
196 uint compress_events : 1;
197#endif
198 uint explicitMinSize : 2;
199 uint explicitMaxSize : 2;
200 uint autoFillBackground : 1;
201 uint nativeChildrenForced : 1;
202 uint inRenderWithPainter : 1;
203 uint hasMask : 1;
204
205 QPointer<QStyle> style;
206 QString styleSheet;
207
208 quint16 customDpiX;
209 quint16 customDpiY;
210#if defined(Q_WS_MAC) && defined(QT_MAC_USE_COCOA)
211 // Cocoa Mask stuff
212 QImage maskBits;
213 CGImageRef imageMask;
214#endif
215};
216
217class Q_GUI_EXPORT QWidgetPrivate : public QObjectPrivate
218{
219 Q_DECLARE_PUBLIC(QWidget)
220
221public:
222 explicit QWidgetPrivate(int version = QObjectPrivateVersion);
223 ~QWidgetPrivate();
224
225 QWExtra *extraData() const;
226 QTLWExtra *topData() const;
227 QTLWExtra *maybeTopData() const;
228 QPainter *sharedPainter() const;
229 void setSharedPainter(QPainter *painter);
230 QWidgetBackingStore *maybeBackingStore() const;
231#ifdef Q_WS_QWS
232 void setMaxWindowState_helper();
233 void setFullScreenSize_helper();
234#endif
235 void init(QWidget *desktopWidget, Qt::WindowFlags f);
236 void create_sys(WId window, bool initializeWindow, bool destroyOldWindow);
237 void createRecursively();
238 void createWinId(WId id = 0);
239
240 void createTLExtra();
241 void createExtra();
242 void deleteExtra();
243 void createSysExtra();
244 void deleteSysExtra();
245 void createTLSysExtra();
246 void deleteTLSysExtra();
247 void updateSystemBackground();
248 void propagatePaletteChange();
249
250 void setPalette_helper(const QPalette &);
251 void resolvePalette();
252 QPalette naturalWidgetPalette(uint inheritedMask) const;
253
254 void setMask_sys(const QRegion &);
255#ifdef Q_WS_WIN
256 bool shouldShowMaximizeButton();
257 void winUpdateIsOpaque();
258#endif
259
260#ifdef Q_WS_MAC
261 void macUpdateSizeAttribute();
262 void macUpdateHideOnSuspend();
263 void macUpdateOpaqueSizeGrip();
264 void macUpdateIgnoreMouseEvents();
265 void macUpdateMetalAttribute();
266 void macUpdateIsOpaque();
267 void setEnabled_helper_sys(bool enable);
268 bool isRealWindow() const;
269#endif
270
271 void raise_sys();
272 void lower_sys();
273 void stackUnder_sys(QWidget *);
274
275 void setFocus_sys();
276
277 void updateFont(const QFont &);
278 inline void setFont_helper(const QFont &font) {
279 if (data.fnt == font && data.fnt.resolve() == font.resolve())
280 return;
281 updateFont(font);
282 }
283 void resolveFont();
284 QFont naturalWidgetFont(uint inheritedMask) const;
285
286 void setLayoutDirection_helper(Qt::LayoutDirection);
287 void resolveLayoutDirection();
288
289 void setLocale_helper(const QLocale &l, bool forceUpdate = false);
290 void resolveLocale();
291
292 void setStyle_helper(QStyle *newStyle, bool propagate, bool metalHack = false);
293 void inheritStyle();
294
295 bool isBackgroundInherited() const;
296
297 void setUpdatesEnabled_helper(bool );
298
299 void paintBackground(QPainter *, const QRegion &, const QPoint & = QPoint(), int flags = DrawAsRoot) const;
300 enum DrawWidgetFlags {
301 DrawAsRoot = 0x01,
302 DrawPaintOnScreen = 0x02,
303 DrawRecursive = 0x04,
304 DrawInvisible = 0x08,
305 DontSubtractOpaqueChildren = 0x10,
306 DontSetCompositionMode = 0x20,
307 DontDrawOpaqueChildren = 0x40
308 };
309 bool isAboutToShow() const;
310 QRegion prepareToRender(const QRegion &region, QWidget::RenderFlags renderFlags);
311 void render_helper(QPainter *painter, const QPoint &targetOffset, const QRegion &sourceRegion,
312 QWidget::RenderFlags renderFlags);
313 void drawWidget(QPaintDevice *pdev, const QRegion &rgn, const QPoint &offset, int flags,
314 QPainter *sharedPainter = 0, QWidgetBackingStore *backingStore = 0);
315
316
317 void paintSiblingsRecursive(QPaintDevice *pdev, const QObjectList& children, int index,
318 const QRegion &rgn, const QPoint &offset, int flags
319#ifdef Q_BACKINGSTORE_SUBSURFACES
320 , const QWindowSurface *currentSurface
321#endif
322 , QPainter *sharedPainter, QWidgetBackingStore *backingStore);
323
324
325 QPainter *beginSharedPainter();
326 bool endSharedPainter();
327 static QGraphicsProxyWidget * nearestGraphicsProxyWidget(QWidget *origin);
328 QWindowSurface *createDefaultWindowSurface();
329 QWindowSurface *createDefaultWindowSurface_sys();
330 void repaint_sys(const QRegion &rgn);
331#ifdef Q_WS_MAC
332 void update_sys(const QRect &rect);
333 void update_sys(const QRegion &rgn);
334#endif
335
336 QRect clipRect() const;
337 QRegion clipRegion() const;
338 void subtractOpaqueChildren(QRegion &rgn, const QRect &clipRect) const;
339 void subtractOpaqueSiblings(QRegion &source, bool *hasDirtySiblingsAbove = 0,
340 bool alsoNonOpaque = false) const;
341 void clipToEffectiveMask(QRegion &region) const;
342 void updateIsOpaque();
343 void setOpaque(bool opaque);
344 void updateIsTranslucent();
345 bool hasBackground() const;
346 bool paintOnScreen() const;
347
348 QRegion getOpaqueRegion() const;
349 const QRegion &getOpaqueChildren() const;
350 void setDirtyOpaqueRegion();
351
352 QRegion opaqueChildren;
353
354 enum CloseMode {
355 CloseNoEvent,
356 CloseWithEvent,
357 CloseWithSpontaneousEvent
358 };
359 bool close_helper(CloseMode mode);
360
361 bool compositeEvent(QEvent *e);
362 void setWindowIcon_helper();
363 void setWindowIcon_sys(bool forceReset = false);
364 void setWindowOpacity_sys(qreal opacity);
365
366 void adjustQuitOnCloseAttribute();
367
368#if defined(Q_WS_X11)
369 void setWindowRole();
370 void sendStartupMessage(const char *message) const;
371 void setNetWmWindowTypes();
372 void x11UpdateIsOpaque();
373#endif
374
375#if defined(Q_WS_WIN) || defined(Q_WS_PM)
376 void reparentChildren();
377#endif
378
379 void scrollChildren(int dx, int dy);
380
381 void moveRect(const QRect &, int dx, int dy);
382 void scrollRect(const QRect &, int dx, int dy);
383 void invalidateBuffer_resizeHelper(const QPoint &oldPos, const QSize &oldSize);
384 // ### Qt 4.6: Merge into a template function (after MSVC isn't supported anymore).
385 void invalidateBuffer(const QRegion &);
386 void invalidateBuffer(const QRect &);
387 bool isOverlapped(const QRect&) const;
388 void syncBackingStore();
389 void syncBackingStore(const QRegion &region);
390
391 void reparentFocusWidgets(QWidget *oldtlw);
392
393 static int pointToRect(const QPoint &p, const QRect &r);
394 QRect fromOrToLayoutItemRect(const QRect &rect, int sign) const;
395
396 void setWinId(WId);
397 void showChildren(bool spontaneous);
398 void hideChildren(bool spontaneous);
399 void setParent_sys(QWidget *parent, Qt::WindowFlags);
400 void scroll_sys(int dx, int dy);
401 void scroll_sys(int dx, int dy, const QRect &r);
402 void deactivateWidgetCleanup();
403 void setGeometry_sys(int, int, int, int, bool);
404#ifdef Q_WS_MAC
405 void setGeometry_sys_helper(int, int, int, int, bool);
406#endif
407 void sendPendingMoveAndResizeEvents(bool recursive = false, bool disableUpdates = false);
408 void activateChildLayoutsRecursively();
409 void show_recursive();
410 void show_helper();
411 void show_sys();
412 void hide_sys();
413 void hide_helper();
414 void _q_showIfNotHidden();
415
416 void setEnabled_helper(bool);
417 void registerDropSite(bool);
418#if defined(Q_WS_WIN) && !defined(QT_NO_DRAGANDDROP)
419 QOleDropTarget *registerOleDnd(QWidget *widget);
420 void unregisterOleDnd(QWidget *widget, QOleDropTarget *target);
421#endif
422 static void adjustFlags(Qt::WindowFlags &flags, QWidget *w = 0);
423
424 void updateFrameStrut();
425 QRect frameStrut() const;
426
427 void setWindowIconText_sys(const QString &cap);
428 void setWindowIconText_helper(const QString &cap);
429 void setWindowTitle_sys(const QString &cap);
430
431#ifdef Q_OS_WIN
432 void grabMouseWhileInWindow();
433#endif
434
435#ifndef QT_NO_CURSOR
436 void setCursor_sys(const QCursor &cursor);
437 void unsetCursor_sys();
438#endif
439
440#ifdef Q_WS_MAC
441 void setWindowModified_sys(bool b);
442 void updateMaximizeButton_sys();
443 void setWindowFilePath_sys(const QString &filePath);
444 void createWindow_sys();
445 void recreateMacWindow();
446#ifndef QT_MAC_USE_COCOA
447 void initWindowPtr();
448 void finishCreateWindow_sys_Carbon(OSWindowRef windowRef);
449#else
450 void finishCreateWindow_sys_Cocoa(void * /*NSWindow * */ windowRef);
451 void syncCocoaMask();
452 void finishCocoaMaskSetup();
453#endif
454 void determineWindowClass();
455 void transferChildren();
456#endif
457 void setWindowTitle_helper(const QString &cap);
458 void setWindowFilePath_helper(const QString &filePath);
459
460 bool setMinimumSize_helper(int &minw, int &minh);
461 bool setMaximumSize_helper(int &maxw, int &maxh);
462 void setConstraints_sys();
463 QWidget *childAt_helper(const QPoint &, bool) const;
464 void updateGeometry_helper(bool forceUpdate);
465
466 void getLayoutItemMargins(int *left, int *top, int *right, int *bottom) const;
467 void setLayoutItemMargins(int left, int top, int right, int bottom);
468 void setLayoutItemMargins(QStyle::SubElement element, const QStyleOption *opt = 0);
469
470 QInputContext *inputContext() const;
471
472#if defined(Q_WS_PM)
473 HWND frameWinId() const
474 { return maybeTopData() && maybeTopData()->fId != NULLHANDLE ?
475 maybeTopData()->fId : data.winid; }
476 HWND effectiveFrameWinId() const;
477#endif
478
479#if defined(Q_WS_QWS)
480 void moveSurface(QWindowSurface *surface, const QPoint &offset);
481
482 QRegion localRequestedRegion() const;
483 QRegion localAllocatedRegion() const;
484
485 void blitToScreen(const QRegion &globalrgn);
486#ifndef QT_NO_CURSOR
487 void updateCursor() const;
488#endif
489
490 QScreen* getScreen() const;
491
492 friend class QWSManager;
493 friend class QWSManagerPrivate;
494 friend class QDecoration;
495#endif
496
497 static int instanceCounter; // Current number of widget instances
498 static int maxInstances; // Maximum number of widget instances
499
500#ifdef QT_KEYPAD_NAVIGATION
501 static QPointer<QWidget> editingWidget;
502#endif
503
504 QWidgetData data;
505
506 QWExtra *extra;
507 QWidget *focus_next;
508 QWidget *focus_prev;
509 QWidget *focus_child;
510#ifndef QT_NO_ACTION
511 QList<QAction*> actions;
512#endif
513 QLayout *layout;
514 QWidgetItemV2 *widgetItem;
515#if !defined(QT_NO_IM)
516 QPointer<QInputContext> ic;
517#endif
518 // All widgets are initially added into the uncreatedWidgets set. Once
519 // they receive a window id they are removed and added to the mapper
520 static QWidgetMapper *mapper;
521 static QWidgetSet *uncreatedWidgets;
522
523 short leftmargin, topmargin, rightmargin, bottommargin;
524
525 signed char leftLayoutItemMargin;
526 signed char topLayoutItemMargin;
527 signed char rightLayoutItemMargin;
528 signed char bottomLayoutItemMargin;
529
530 // ### TODO: reorganize private/extra/topextra to save memory
531 QPointer<QWidget> compositeChildGrab;
532#ifndef QT_NO_TOOLTIP
533 QString toolTip;
534#endif
535#ifndef QT_NO_STATUSTIP
536 QString statusTip;
537#endif
538#ifndef QT_NO_WHATSTHIS
539 QString whatsThis;
540#endif
541 QString accessibleName, accessibleDescription;
542
543 QPalette::ColorRole fg_role : 8;
544 QPalette::ColorRole bg_role : 8;
545 uint high_attributes[3]; // the low ones are in QWidget::widget_attributes
546 Qt::HANDLE hd;
547 QRegion dirty;
548 QRegion *needsFlush;
549 uint dirtyOpaqueChildren : 1;
550 uint isOpaque : 1;
551 uint inDirtyList : 1;
552 uint isScrolled : 1;
553 uint isMoved : 1;
554
555#if defined(Q_WS_WIN) || defined(Q_WS_PM)
556 uint noPaintOnScreen : 1; // see qwidget_[win|pm].cpp ::paintEngine()
557#endif
558
559 uint inheritedFontResolveMask;
560 uint inheritedPaletteResolveMask;
561#if defined(Q_WS_X11)
562 QX11Info xinfo;
563 Qt::HANDLE picture;
564#endif
565#if defined(Q_WS_MAC)
566 enum PaintChildrenOPs {
567 PC_None = 0x00,
568 PC_Now = 0x01,
569 PC_NoPaint = 0x04,
570 PC_Later = 0x10
571 };
572 EventHandlerRef window_event;
573 bool qt_mac_dnd_event(uint, DragRef);
574 void toggleDrawers(bool);
575 //mac event functions
576 static bool qt_create_root_win();
577 static void qt_clean_root_win();
578 static bool qt_recreate_root_win();
579 static bool qt_mac_update_sizer(QWidget *, int up = 0);
580 static OSStatus qt_window_event(EventHandlerCallRef er, EventRef event, void *);
581 static OSStatus qt_widget_event(EventHandlerCallRef er, EventRef event, void *);
582 static bool qt_widget_rgn(QWidget *, short, RgnHandle, bool);
583 static bool qt_widget_shape(QWidget *, short, HIMutableShapeRef, bool);
584
585 // Each wiget keeps a list of all its child and grandchild OpenGL widgets.
586 // This list is used to update the gl context whenever a parent and a granparent
587 // moves, and also to check for intersections with gl widgets within the window
588 // when a widget moves.
589 struct GlWidgetInfo
590 {
591 GlWidgetInfo(QWidget *widget) : widget(widget), lastUpdateWidget(0) { }
592 bool operator==(const GlWidgetInfo &other) const { return (widget == other.widget); }
593 QWidget * widget;
594 QWidget * lastUpdateWidget;
595 };
596 QList<GlWidgetInfo> glWidgets;
597
598 // dirtyOnWidget contains the areas in the widget that needs to be repained,
599 // in the same way as dirtyOnScreen does for the window. Areas are added in
600 // dirtyWidget_sys and cleared in the paint event. In scroll_sys we then use
601 // this information repaint invalid areas when widgets are scrolled.
602 QRegion dirtyOnWidget;
603
604 //these are here just for code compat (HIViews)
605 Qt::HANDLE qd_hd;
606
607 // This is new stuff
608 uint needWindowChange : 1;
609 uint isGLWidget : 1;
610#endif
611
612#if defined(Q_WS_X11) || defined (Q_WS_WIN) || defined (Q_WS_PM) || defined(Q_WS_MAC)
613#ifdef Q_WS_MAC
614 void setWSGeometry(bool dontShow=false, const QRect &oldRect = QRect());
615#else
616 void setWSGeometry(bool dontShow=false);
617#endif
618
619 inline QPoint mapToWS(const QPoint &p) const
620 { return p - data.wrect.topLeft(); }
621
622 inline QPoint mapFromWS(const QPoint &p) const
623 { return p + data.wrect.topLeft(); }
624
625 inline QRect mapToWS(const QRect &r) const
626 { QRect rr(r); rr.translate(-data.wrect.topLeft()); return rr; }
627
628 inline QRect mapFromWS(const QRect &r) const
629 { QRect rr(r); rr.translate(data.wrect.topLeft()); return rr; }
630#endif
631
632 QPaintEngine *extraPaintEngine;
633
634 mutable const QMetaObject *polished;
635
636 void setModal_sys();
637
638#ifdef Q_WS_PM
639 void validateObstacles();
640#endif
641
642 QSizePolicy size_policy;
643 QLocale locale;
644
645#ifdef Q_WS_X11
646 static QWidget *mouseGrabber;
647 static QWidget *keyboardGrabber;
648#endif
649 QPaintDevice *redirectDev;
650 QPoint redirectOffset;
651
652 inline void setRedirected(QPaintDevice *replacement, const QPoint &offset)
653 {
654 Q_ASSERT(q_func()->testAttribute(Qt::WA_WState_InPaintEvent));
655 redirectDev = replacement;
656 redirectOffset = offset;
657 }
658
659 inline QPaintDevice *redirected(QPoint *offset) const
660 {
661 if (offset)
662 *offset = redirectDev ? redirectOffset : QPoint();
663 return redirectDev;
664 }
665
666 inline void restoreRedirected()
667 { redirectDev = 0; }
668
669 inline void enforceNativeChildren()
670 {
671 if (!extra)
672 createExtra();
673
674 if (extra->nativeChildrenForced)
675 return;
676 extra->nativeChildrenForced = 1;
677
678 for (int i = 0; i < children.size(); ++i) {
679 if (QWidget *child = qobject_cast<QWidget *>(children.at(i)))
680 child->setAttribute(Qt::WA_NativeWindow);
681 }
682 }
683
684 inline bool nativeChildrenForced() const
685 {
686 return extra ? extra->nativeChildrenForced : false;
687 }
688
689 QSize adjustedSize() const;
690};
691
692inline QWExtra *QWidgetPrivate::extraData() const
693{
694 return extra;
695}
696
697inline QTLWExtra *QWidgetPrivate::topData() const
698{
699 const_cast<QWidgetPrivate *>(this)->createTLExtra();
700 return extra->topextra;
701}
702
703inline QTLWExtra *QWidgetPrivate::maybeTopData() const
704{
705 return extra ? extra->topextra : 0;
706}
707
708inline QPainter *QWidgetPrivate::sharedPainter() const
709{
710 Q_Q(const QWidget);
711 QTLWExtra *x = q->window()->d_func()->maybeTopData();
712 return x ? x->sharedPainter : 0;
713}
714
715inline void QWidgetPrivate::setSharedPainter(QPainter *painter)
716{
717 Q_Q(QWidget);
718 QTLWExtra *x = q->window()->d_func()->topData();
719 x->sharedPainter = painter;
720}
721
722inline QWidgetBackingStore *QWidgetPrivate::maybeBackingStore() const
723{
724 Q_Q(const QWidget);
725 QTLWExtra *x = q->window()->d_func()->maybeTopData();
726 return x ? x->backingStore : 0;
727}
728
729QT_END_NAMESPACE
730
731#endif // QWIDGET_P_H
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