summaryrefslogtreecommitdiffstats
path: root/src/widgets/qbutton.cpp
blob: 57178fbd03c82e58196761070cb9a3c9739fa9eb (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
/****************************************************************************
**
** Implementation of QButton widget class
**
** Created : 940206
**
** Copyright (C) 1992-2008 Trolltech ASA.  All rights reserved.
**
** This file is part of the widgets module of the Qt GUI Toolkit.
**
** This file may be used under the terms of the GNU General
** Public 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 License if such license has been
** publicly approved by Trolltech ASA (or its successors, if any)
** and the KDE Free Qt Foundation.
**
** Please review the following information to ensure GNU General
** Public Licensing requirements will be met:
** http://trolltech.com/products/qt/licenses/licensing/opensource/.
** If you are unsure which license is appropriate for your use, please
** review the following information:
** http://trolltech.com/products/qt/licenses/licensing/licensingoverview
** or contact the sales department at sales@trolltech.com.
**
** This file may be used under the terms of the Q Public License as
** defined by Trolltech ASA and appearing in the file LICENSE.QPL
** included in the packaging of this file.  Licensees holding valid Qt
** Commercial licenses may use this file in accordance with the Qt
** Commercial License Agreement provided with the Software.
**
** This file is provided "AS IS" with NO WARRANTY OF ANY KIND,
** INCLUDING THE WARRANTIES OF DESIGN, MERCHANTABILITY AND FITNESS FOR
** A PARTICULAR PURPOSE. Trolltech reserves all rights not granted
** herein.
**
**********************************************************************/

#undef QT_NO_COMPAT
#include "qbutton.h"
#ifndef QT_NO_BUTTON
#include "qbuttongroup.h"
#include "qbitmap.h"
#include "qpainter.h"
#include "qtimer.h"
#include "qaccel.h"
#include "qpixmapcache.h"
#include "qapplication.h"
#include "qpushbutton.h"
#include "qradiobutton.h"
#include "qguardedptr.h"
#include "../kernel/qinternal_p.h"

#if defined(QT_ACCESSIBILITY_SUPPORT)
#include "qaccessible.h"
#endif

#define AUTO_REPEAT_DELAY  300
#define AUTO_REPEAT_PERIOD 100

class QButtonData
{
public:
    QButtonData() {
#ifndef QT_NO_BUTTONGROUP
	group = 0;
#endif
#ifndef QT_NO_ACCEL
	a = 0;
#endif
    }
#ifndef QT_NO_BUTTONGROUP
    QButtonGroup *group;
#endif
    QTimer timer;
#ifndef QT_NO_ACCEL
    QAccel *a;
#endif
};


void QButton::ensureData()
{
    if ( !d ) {
	d = new QButtonData;
	Q_CHECK_PTR( d );
	connect(&d->timer, SIGNAL(timeout()), this, SLOT(autoRepeatTimeout()));
    }
}


/*!
    Returns the group that this button belongs to.

    If the button is not a member of any QButtonGroup, this function
    returns 0.

    \sa QButtonGroup
*/

QButtonGroup *QButton::group() const
{
#ifndef QT_NO_BUTTONGROUP
    return d ? d->group : 0;
#else
    return 0;
#endif
}


void QButton::setGroup( QButtonGroup* g )
{
#ifndef QT_NO_BUTTONGROUP
    ensureData();
    d->group = g;
#endif
}


QTimer *QButton::timer()
{
    ensureData();
    return &d->timer;
}


/*!
    \class QButton qbutton.h
    \brief The QButton class is the abstract base class of button
    widgets, providing functionality common to buttons.

    \ingroup abstractwidgets

    <b>If you want to create a button use QPushButton.</b>

    The QButton class implements an \e abstract button, and lets
    subclasses specify how to reply to user actions and how to draw
    the button.

    QButton provides both push and toggle buttons. The QRadioButton
    and QCheckBox classes provide only toggle buttons; QPushButton and
    QToolButton provide both toggle and push buttons.

    Any button can have either a text or pixmap label. setText() sets
    the button to be a text button and setPixmap() sets it to be a
    pixmap button. The text/pixmap is manipulated as necessary to
    create the "disabled" appearance when the button is disabled.

    QButton provides most of the states used for buttons:
    \list
    \i isDown() indicates whether the button is \e pressed down.
    \i isOn() indicates whether the button is \e on.
       Only toggle buttons can be switched on and off  (see below).
    \i isEnabled() indicates whether the button can be pressed by the
       user.
    \i setAutoRepeat() sets whether the button will auto-repeat
       if the user holds it down.
    \i setToggleButton() sets whether the button is a toggle
       button or not.
    \endlist

    The difference between isDown() and isOn() is as follows: When the
    user clicks a toggle button to toggle it on, the button is first
    \e pressed and then released into the \e on state. When the user
    clicks it again (to toggle it off), the button moves first to the
    \e pressed state, then to the \e off state (isOn() and isDown()
    are both FALSE).

    Default buttons (as used in many dialogs) are provided by
    QPushButton::setDefault() and QPushButton::setAutoDefault().

    QButton provides five signals:
    \list 1
    \i pressed() is emitted when the button is pressed. E.g. with the mouse
       or when animateClick() is called.
    \i released() is emitted when the button is released. E.g. when the mouse
       is released or the cursor is moved outside the widget.
    \i clicked() is emitted when the button is first pressed and then
       released when the accelerator key is typed, or when
       animateClick() is called.
    \i toggled(bool) is emitted when the state of a toggle button changes.
    \i stateChanged(int) is emitted when the state of a tristate
       toggle button changes.
    \endlist

    If the button is a text button with an ampersand (\&) in its text,
    QButton creates an automatic accelerator key. This code creates a
    push button labelled "Ro<u>c</u>k \& Roll" (where the c is
    underlined). The button gets an automatic accelerator key, Alt+C:

    \code
	QPushButton *p = new QPushButton( "Ro&ck && Roll", this );
    \endcode

    In this example, when the user presses Alt+C the button will call
    animateClick().

    You can also set a custom accelerator using the setAccel()
    function. This is useful mostly for pixmap buttons because they
    have no automatic accelerator.

    \code
	p->setPixmap( QPixmap("print.png") );
	p->setAccel( ALT+Key_F7 );
    \endcode

    All of the buttons provided by Qt (\l QPushButton, \l QToolButton,
    \l QCheckBox and \l QRadioButton) can display both text and
    pixmaps.

    To subclass QButton, you must reimplement at least drawButton()
    (to draw the button's outline) and drawButtonLabel() (to draw its
    text or pixmap). It is generally advisable to reimplement
    sizeHint() as well, and sometimes hitButton() (to determine
    whether a button press is within the button).

    To reduce flickering, QButton::paintEvent() sets up a pixmap that
    the drawButton() function draws in. You should not reimplement
    paintEvent() for a subclass of QButton unless you want to take
    over all drawing.

    \sa QButtonGroup
*/


/*!
    \enum QButton::ToggleType

    This enum type defines what a button can do in response to a
    mouse/keyboard press:

    \value SingleShot  pressing the button causes an action, then the
    button returns to the unpressed state.

    \value Toggle  pressing the button toggles it between an \c On and
    an \c Off state.

    \value Tristate  pressing the button cycles between the three
    states \c On, \c Off and \c NoChange
*/

/*!
    \enum QButton::ToggleState

    This enum defines the state of a toggle button.

    \value Off  the button is in the "off" state
    \value NoChange  the button is in the default/unchanged state
    \value On  the button is in the "on" state
*/

/*!
    \property QButton::accel
    \brief the accelerator associated with the button

    This property is 0 if there is no accelerator set. If you set this
    property to 0 then any current accelerator is removed.
*/

/*!
    \property QButton::autoRepeat
    \brief whether autoRepeat is enabled

    If autoRepeat is enabled then the clicked() signal is emitted at
    regular intervals if the button is down. This property has no
    effect on toggle buttons. autoRepeat is off by default.
*/

/*! \property QButton::autoResize
    \brief whether autoResize is enabled
    \obsolete

  If autoResize is enabled then the button will resize itself
  whenever the contents are changed.
*/

/*!
    \property QButton::down
    \brief whether the button is pressed

    If this property is TRUE, the button is pressed down. The signals
    pressed() and clicked() are not emitted if you set this property
    to TRUE. The default is FALSE.
*/

/*!
    \property QButton::exclusiveToggle
    \brief whether the button is an exclusive toggle

    If this property is TRUE and the button is in a QButtonGroup, the
    button can only be toggled off by another one being toggled on.
    The default is FALSE.
*/

/*!
    \property QButton::on
    \brief whether the button is toggled

    This property should only be set for toggle buttons.
*/

/*!
    \fn void QButton::setOn( bool on )

    Sets the state of this button to On if \a on is TRUE; otherwise to
    Off.

    \sa toggleState
*/

/*!
    \property QButton::pixmap
    \brief the pixmap shown on the button

    If the pixmap is monochrome (i.e. it is a QBitmap or its \link
    QPixmap::depth() depth\endlink is 1) and it does not have a mask,
    this property will set the pixmap to be its own mask. The purpose
    of this is to draw transparent bitmaps which are important for
    toggle buttons, for example.

    pixmap() returns 0 if no pixmap was set.
*/

/*!
    \property QButton::text
    \brief the text shown on the button

    This property will return a QString::null if the button has no
    text. If the text has an ampersand (\&) in it, then an
    accelerator is automatically created for it using the character
    that follows the '\&' as the accelerator key. Any previous
    accelerator will be overwritten, or cleared if no accelerator is
    defined by the text.

    There is no default text.
*/

/*!
    \property QButton::toggleButton
    \brief whether the button is a toggle button

    The default value is FALSE.
*/

/*!
    \fn QButton::setToggleButton( bool b )

    If \a b is TRUE, this button becomes a toggle button; if \a b is
    FALSE, this button becomes a command button.

    \sa toggleButton
*/

/*!
    \property QButton::toggleState
    \brief the state of the toggle button

    If this property is changed then it does not cause the button
    to be repainted.
*/

/*!
    \property QButton::toggleType
    \brief the type of toggle on the button

    The default toggle type is \c SingleShot.

    \sa QButton::ToggleType
*/

/*!
    Constructs a standard button called \a name with parent \a parent,
    using the widget flags \a f.

    If \a parent is a QButtonGroup, this constructor calls
    QButtonGroup::insert().
*/

QButton::QButton( QWidget *parent, const char *name, WFlags f )
    : QWidget( parent, name, f )
{
    bpixmap    = 0;
    toggleTyp  = SingleShot;			// button is simple
    buttonDown = FALSE;				// button is up
    stat       = Off;				// button is off
    mlbDown    = FALSE;				// mouse left button up
    autoresize = FALSE;				// not auto resizing
    animation  = FALSE;				// no pending animateClick
    repeat     = FALSE;				// not in autorepeat mode
    d	       = 0;
#ifndef QT_NO_BUTTONGROUP
    if ( ::qt_cast<QButtonGroup*>(parent) ) {
	setGroup((QButtonGroup*)parent);
	group()->insert( this );		// insert into button group
    }
#endif
    setFocusPolicy( TabFocus );
}

/*!
    Destroys the button.
 */
QButton::~QButton()
{
#ifndef QT_NO_BUTTONGROUP
    if ( group() )
	group()->remove( this );
#endif
    delete bpixmap;
    delete d;
}


/*!
    \fn void QButton::pressed()

    This signal is emitted when the button is pressed down.

    \sa released(), clicked()
*/

/*!
    \fn void QButton::released()

    This signal is emitted when the button is released.

    \sa pressed(), clicked(), toggled()
*/

/*!
    \fn void QButton::clicked()

    This signal is emitted when the button is activated (i.e. first
    pressed down and then released when the mouse cursor is inside the
    button), when the accelerator key is typed or when animateClick()
    is called. This signal is \e not emitted if you call setDown().

    The QButtonGroup::clicked() signal does the same job, if you want
    to connect several buttons to the same slot.

    \warning Don't launch a model dialog in response to this signal
    for a button that has \c autoRepeat turned on.

    \sa pressed(), released(), toggled() autoRepeat down
*/

/*!
    \fn void QButton::toggled( bool on )

    This signal is emitted whenever a toggle button changes status. \a
    on is TRUE if the button is on, or FALSE if the button is off.

    This may be the result of a user action, toggle() slot activation,
    or because setOn() was called.

    \sa clicked()
*/

/*!
    \fn void QButton::stateChanged( int state )

    This signal is emitted whenever a toggle button changes state. \a
    state is \c On if the button is on, \c NoChange if it is in the
    \link QCheckBox::setTristate() "no change" state\endlink or \c Off
    if the button is off.

    This may be the result of a user action, toggle() slot activation,
    setState(), or because setOn() was called.

    \sa clicked() QButton::ToggleState
*/

void QButton::setText( const QString &text )
{
    if ( btext == text )
	return;
    btext = text;
#ifndef QT_NO_ACCEL
    setAccel( QAccel::shortcutKey( text ) );
#endif

    if ( bpixmap ) {
	delete bpixmap;
	bpixmap = 0;
    }

    if ( autoresize )
	adjustSize();

    update();
    updateGeometry();

#if defined(QT_ACCESSIBILITY_SUPPORT)
    QAccessible::updateAccessibility( this, 0, QAccessible::NameChanged );
#endif
}

void QButton::setPixmap( const QPixmap &pixmap )
{
    if ( bpixmap && bpixmap->serialNumber() == pixmap.serialNumber() )
	return;

    bool newSize;
    if ( bpixmap ) {
	newSize = pixmap.width() != bpixmap->width() ||
		  pixmap.height() != bpixmap->height();
	*bpixmap = pixmap;
    } else {
	newSize = TRUE;
	bpixmap = new QPixmap( pixmap );
	Q_CHECK_PTR( bpixmap );
    }
    if ( bpixmap->depth() == 1 && !bpixmap->mask() )
	bpixmap->setMask( *((QBitmap *)bpixmap) );
    if ( !btext.isNull() ) {
	btext = QString::null;
#ifndef QT_NO_ACCEL
	setAccel( QKeySequence() );
#endif
    }
    if ( autoresize && newSize )
	adjustSize();
    if ( autoMask() )
	updateMask();
    update();
    if ( newSize )
	updateGeometry();
}


#ifndef QT_NO_ACCEL
QKeySequence QButton::accel() const
{
    if ( d && d->a )
	return d->a->key( 0 );
    return QKeySequence();
}

void QButton::setAccel( const QKeySequence& key )
{
    if ( d && d->a )
	d->a->clear();
    if ( key.isEmpty() )
	return;
    ensureData();
    if ( !d->a ) {
	d->a = new QAccel( this, "buttonAccel" );
	connect( d->a, SIGNAL( activated(int) ), this, SLOT( animateClick() ) );
	connect( d->a, SIGNAL( activatedAmbiguously(int) ), this, SLOT( setFocus() ) );
    }
    d->a->insertItem( key, 0 );
}
#endif

#ifndef QT_NO_COMPAT

void QButton::setAutoResize( bool enable )
{
    if ( (bool)autoresize != enable ) {
	autoresize = enable;
	if ( autoresize )
	    adjustSize();			// calls resize which repaints
    }
}

#endif

void QButton::setAutoRepeat( bool enable )
{
    repeat = (uint)enable;
    if ( repeat && mlbDown )
	timer()->start( AUTO_REPEAT_DELAY, TRUE );
}

/*!
    Performs an animated click: the button is pressed and released a
    short while later.

    The pressed(), released(), clicked(), toggled(), and
    stateChanged() signals are emitted as appropriate.

    This function does nothing if the button is \link setEnabled()
    disabled. \endlink

    \sa setAccel()
*/

void QButton::animateClick()
{
    if ( !isEnabled() || animation )
	return;
    animation = TRUE;
    buttonDown = TRUE;
    repaint( FALSE );
    emit pressed();
    QTimer::singleShot( 100, this, SLOT(animateTimeout()) );
}

void QButton::emulateClick()
{
    if ( !isEnabled() || animation )
	return;
    animation = TRUE;
    buttonDown = TRUE;
    emit pressed();
    animateTimeout();
}

void QButton::setDown( bool enable )
{
    if ( d )
	timer()->stop();
    mlbDown = FALSE;				// the safe setting
    if ( (bool)buttonDown != enable ) {
	buttonDown = enable;
	repaint( FALSE );
#if defined(QT_ACCESSIBILITY_SUPPORT)
	QAccessible::updateAccessibility( this, 0, QAccessible::StateChanged );
#endif
    }
}

/*!
  Sets the toggle state of the button to \a s. \a s can be \c Off, \c
  NoChange or \c On.
*/

void QButton::setState( ToggleState s )
{
    if ( !toggleTyp ) {
#if defined(QT_CHECK_STATE)
	qWarning( "QButton::setState() / setOn: (%s) Only toggle buttons "
		 "may be switched", name( "unnamed" ) );
#endif
	return;
    }

    if ( (ToggleState)stat != s ) {		// changed state
	bool was = stat != Off;
	stat = s;
	if ( autoMask() )
	    updateMask();
	repaint( FALSE );
#if defined(QT_ACCESSIBILITY_SUPPORT)
	QAccessible::updateAccessibility( this, 0, QAccessible::StateChanged );
#endif
	// ### toggled for tristate makes no sense. Don't emit the signal in 4.0
	if ( was != (stat != Off) )
	    emit toggled( stat != Off );
	emit stateChanged( s );
    }
}


/*!
    Returns TRUE if \a pos is inside the clickable button rectangle;
    otherwise returns FALSE.

    By default, the clickable area is the entire widget. Subclasses
    may reimplement it, though.
*/
bool QButton::hitButton( const QPoint &pos ) const
{
    return rect().contains( pos );
}

/*!
    Draws the button. The default implementation does nothing.

    This virtual function is reimplemented by subclasses to draw real
    buttons. At some point, these reimplementations should call
    drawButtonLabel().

    \sa drawButtonLabel(), paintEvent()
*/
#if (QT_VERSION-0 >= 0x040000)
#error "QButton. Make pure virtual"
#endif
void QButton::drawButton( QPainter * )
{
    return;
}

/*!
    Draws the button text or pixmap.

    This virtual function is reimplemented by subclasses to draw real
    buttons. It is invoked by drawButton().

    \sa drawButton(), paintEvent()
*/

void QButton::drawButtonLabel( QPainter * )
{
    return;
}

/*! \reimp */
void QButton::keyPressEvent( QKeyEvent *e )
{
    switch ( e->key() ) {
    case Key_Enter:
    case Key_Return:
	{
#ifndef QT_NO_PUSHBUTTON
	    QPushButton *pb = (QPushButton*)qt_cast( "QPushButton" );
	    if ( pb && ( pb->autoDefault() || pb->isDefault() ) )
		emit clicked();
	    else
#endif
		e->ignore();
	}
	break;
    case Key_Space:
	if ( !e->isAutoRepeat() ) {
	    setDown( TRUE );
#ifndef QT_NO_PUSHBUTTON
	    if ( ::qt_cast<QPushButton*>(this) )
		emit pressed();
	    else
#endif
		e->ignore();
	}
	break;
    case Key_Up:
    case Key_Left:
#ifndef QT_NO_BUTTONGROUP
	if ( group() ) {
	    group()->moveFocus( e->key() );
	} else
#endif
	{
	    QFocusEvent::setReason(QFocusEvent::Backtab);
	    focusNextPrevChild( FALSE );
	    QFocusEvent::resetReason();
	}
	break;
    case Key_Right:
    case Key_Down:
#ifndef QT_NO_BUTTONGROUP
	if ( group() ) {
	    group()->moveFocus( e->key() );
	} else
#endif
	{
	    QFocusEvent::setReason(QFocusEvent::Tab);
	    focusNextPrevChild( TRUE );
	    QFocusEvent::resetReason();
	}
	break;
    case Key_Escape:
	if ( buttonDown ) {
	    buttonDown = FALSE;
	    update();
	    break;
	}
	// fall through
    default:
	e->ignore();
    }
}

/*! \reimp */
void QButton::keyReleaseEvent( QKeyEvent * e)
{
    switch ( e->key() ) {
    case Key_Space:
	if ( buttonDown && !e->isAutoRepeat() ) {
	    buttonDown = FALSE;
	    nextState();
	    emit released();
	    emit clicked();
	}
	break;
    default:
	e->ignore();
    }
}

/*! \reimp */
void QButton::mousePressEvent( QMouseEvent *e )
{
    if ( e->button() != LeftButton ) {
	e->ignore();
	return;
    }
    bool hit = hitButton( e->pos() );
    if ( hit ) {				// mouse press on button
	mlbDown = TRUE;				// left mouse button down
	buttonDown = TRUE;
	if ( autoMask() )
	    updateMask();

	repaint( FALSE );
#if defined(QT_ACCESSIBILITY_SUPPORT)
	QAccessible::updateAccessibility( this, 0, QAccessible::StateChanged );
#endif
	QGuardedPtr<QTimer> t = timer();
	emit pressed();
	if ( t && repeat )
	    t->start( AUTO_REPEAT_DELAY, TRUE );
    }
}

/*! \reimp */
void QButton::mouseReleaseEvent( QMouseEvent *e)
{
    if ( e->button() != LeftButton ) {

	// clean up apperance if left button has been pressed
	if (mlbDown || buttonDown) {
	    mlbDown = FALSE;
	    buttonDown = FALSE;

	    if ( autoMask() )
		updateMask();
	    repaint( FALSE );
	}

	e->ignore();
	return;
    }
    if ( !mlbDown )
	return;
    if ( d )
	timer()->stop();

    const bool oldButtonDown = buttonDown;
    mlbDown = FALSE;				// left mouse button up
    buttonDown = FALSE;
    if ( hitButton( e->pos() ) ) {		// mouse release on button
	nextState();
#if defined(QT_ACCESSIBILITY_SUPPORT)
	QAccessible::updateAccessibility( this, 0, QAccessible::StateChanged );
#endif
	emit released();
	emit clicked();
    } else {
	repaint( FALSE );
#if defined(QT_ACCESSIBILITY_SUPPORT)
	QAccessible::updateAccessibility( this, 0, QAccessible::StateChanged );
#endif
        if (oldButtonDown)
            emit released();
    }
}

/*! \reimp */
void QButton::mouseMoveEvent( QMouseEvent *e )
{
    if ( !((e->state() & LeftButton) && mlbDown) ) {
	e->ignore();
	return;					// left mouse button is up
    }
    if ( hitButton(e->pos()) ) {		// mouse move in button
	if ( !buttonDown ) {
	    buttonDown = TRUE;
	    repaint( FALSE );
#if defined(QT_ACCESSIBILITY_SUPPORT)
	    QAccessible::updateAccessibility( this, 0, QAccessible::StateChanged );
#endif
	    emit pressed();
	}
    } else {					// mouse move outside button
	if ( buttonDown ) {
	    buttonDown = FALSE;
	    repaint( FALSE );
#if defined(QT_ACCESSIBILITY_SUPPORT)
	    QAccessible::updateAccessibility( this, 0, QAccessible::StateChanged );
#endif
	    emit released();
	}
    }
}


/*!
    Handles paint events for buttons. Small and typically complex
    buttons are painted double-buffered to reduce flicker. The
    actually drawing is done in the virtual functions drawButton() and
    drawButtonLabel().

    \sa drawButton(), drawButtonLabel()
*/
void QButton::paintEvent( QPaintEvent *)
{
    QSharedDoubleBuffer buffer( this );
    drawButton( buffer.painter() );
}

/*! \reimp */
void QButton::focusInEvent( QFocusEvent * e)
{
    QWidget::focusInEvent( e );
}

/*! \reimp */
void QButton::focusOutEvent( QFocusEvent * e )
{
    buttonDown = FALSE;
    QWidget::focusOutEvent( e );
}

/*!
    Internal slot used for auto repeat.
*/
void QButton::autoRepeatTimeout()
{
    if ( mlbDown && isEnabled() && autoRepeat() ) {
	QGuardedPtr<QTimer> t = timer();
	if ( buttonDown ) {
	    emit released();
	    emit clicked();
	    emit pressed();
	}
	if ( t )
	    t->start( AUTO_REPEAT_PERIOD, TRUE );
    }
}

/*!
    Internal slot used for the second stage of animateClick().
*/
void QButton::animateTimeout()
{
    if ( !animation )
	return;
    animation  = FALSE;
    buttonDown = FALSE;
    nextState();
    emit released();
    emit clicked();
}


void QButton::nextState()
{
    bool t = isToggleButton() && !( isOn() && isExclusiveToggle() );
    bool was = stat != Off;
    if ( t ) {
	if ( toggleTyp == Tristate )
	    stat = ( stat + 1 ) % 3;
	else
	    stat = stat ? Off : On;
    }
    if ( autoMask() )
        updateMask();
    repaint( FALSE );
    if ( t ) {
#if defined(QT_ACCESSIBILITY_SUPPORT)
	QAccessible::updateAccessibility( this, 0, QAccessible::StateChanged );
#endif
	if ( was != (stat != Off) )
	    emit toggled( stat != Off );
	emit stateChanged( stat );
    }
}

/*! \reimp */
void QButton::enabledChange( bool e )
{
    if ( !isEnabled() )
	setDown( FALSE );
    QWidget::enabledChange( e );
}


/*!
    Toggles the state of a toggle button.

    \sa isOn(), setOn(), toggled(), isToggleButton()
*/
void QButton::toggle()
{
    if ( isToggleButton() )
	 setOn( !isOn() );
}

/*!
    Sets the toggle type of the button to \a type.

    \a type can be set to \c SingleShot, \c Toggle and \c Tristate.
*/
void QButton::setToggleType( ToggleType type )
{
    toggleTyp = type;
    if ( type != Tristate && stat == NoChange )
	setState( On );
#if defined(QT_ACCESSIBILITY_SUPPORT)
    else
	QAccessible::updateAccessibility( this, 0, QAccessible::StateChanged );
#endif
}

bool QButton::isExclusiveToggle() const
{
#ifndef QT_NO_BUTTONGROUP
    return group() && ( group()->isExclusive() ||
			group()->isRadioButtonExclusive() &&
			::qt_cast<QRadioButton*>(this) );
#else
    return FALSE;
#endif
}

#endif