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
/* -*- mode: C++ ; c-file-style: "stroustrup" -*- *****************************
* Qwt Widget Library
* Copyright (C) 1997 Josef Wilgen
* Copyright (C) 2002 Uwe Rathmann
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the Qwt License, Version 1.0
*****************************************************************************/
#include "qwt_slider.h"
#include "qwt_painter.h"
#include "qwt_scale_draw.h"
#include "qwt_scale_map.h"
#include <qevent.h>
#include <qdrawutil.h>
#include <qpainter.h>
#include <qalgorithms.h>
#include <qmath.h>
#include <qstyle.h>
#include <qstyleoption.h>
#include <qapplication.h>
static QSize qwtHandleSize( const QSize &size,
Qt::Orientation orientation, bool hasTrough )
{
QSize handleSize = size;
if ( handleSize.isEmpty() )
{
const int handleThickness = 16;
handleSize.setWidth( 2 * handleThickness );
handleSize.setHeight( handleThickness );
if ( !hasTrough )
handleSize.transpose();
if ( orientation == Qt::Vertical )
handleSize.transpose();
}
return handleSize;
}
static QwtScaleDraw::Alignment qwtScaleDrawAlignment(
Qt::Orientation orientation, QwtSlider::ScalePosition scalePos )
{
QwtScaleDraw::Alignment align;
if ( orientation == Qt::Vertical )
{
// NoScale lays out like Left
if ( scalePos == QwtSlider::LeadingScale )
align = QwtScaleDraw::RightScale;
else
align = QwtScaleDraw::LeftScale;
}
else
{
// NoScale lays out like Bottom
if ( scalePos == QwtSlider::TrailingScale )
align = QwtScaleDraw::TopScale;
else
align = QwtScaleDraw::BottomScale;
}
return align;
}
class QwtSlider::PrivateData
{
public:
PrivateData():
repeatTimerId( 0 ),
updateInterval( 150 ),
stepsIncrement( 0 ),
pendingValueChange( false ),
borderWidth( 2 ),
spacing( 4 ),
scalePosition( QwtSlider::TrailingScale ),
hasTrough( true ),
hasGroove( false ),
mouseOffset( 0 )
{
}
int repeatTimerId;
bool timerTick;
int updateInterval;
int stepsIncrement;
bool pendingValueChange;
QRect sliderRect;
QSize handleSize;
int borderWidth;
int spacing;
Qt::Orientation orientation;
QwtSlider::ScalePosition scalePosition;
bool hasTrough;
bool hasGroove;
int mouseOffset;
mutable QSize sizeHintCache;
};
/*!
Construct vertical slider in QwtSlider::Trough style
with a scale to the left.
The scale is initialized to [0.0, 100.0] and the value set to 0.0.
\param parent Parent widget
\sa setOrientation(), setScalePosition(), setBackgroundStyle()
*/
QwtSlider::QwtSlider( QWidget *parent ):
QwtAbstractSlider( parent )
{
initSlider( Qt::Vertical );
}
/*!
Construct a slider in QwtSlider::Trough style
When orientation is Qt::Vertical the scale will be aligned to
the left - otherwise at the the top of the slider.
The scale is initialized to [0.0, 100.0] and the value set to 0.0.
\param parent Parent widget
\param orientation Orientation of the slider.
*/
QwtSlider::QwtSlider( Qt::Orientation orientation, QWidget *parent ):
QwtAbstractSlider( parent )
{
initSlider( orientation );
}
//! Destructor
QwtSlider::~QwtSlider()
{
delete d_data;
}
void QwtSlider::initSlider( Qt::Orientation orientation )
{
if ( orientation == Qt::Vertical )
setSizePolicy( QSizePolicy::Fixed, QSizePolicy::Expanding );
else
setSizePolicy( QSizePolicy::Expanding, QSizePolicy::Fixed );
setAttribute( Qt::WA_WState_OwnSizePolicy, false );
d_data = new QwtSlider::PrivateData;
d_data->orientation = orientation;
scaleDraw()->setAlignment(
qwtScaleDrawAlignment( orientation, d_data->scalePosition ) );
scaleDraw()->setLength( 100 );
setScale( 0.0, 100.0 );
setValue( 0.0 );
}
/*!
\brief Set the orientation.
\param orientation Allowed values are Qt::Horizontal and Qt::Vertical.
\sa orientation(), scalePosition()
*/
void QwtSlider::setOrientation( Qt::Orientation orientation )
{
if ( orientation == d_data->orientation )
return;
d_data->orientation = orientation;
scaleDraw()->setAlignment(
qwtScaleDrawAlignment( orientation, d_data->scalePosition ) );
if ( !testAttribute( Qt::WA_WState_OwnSizePolicy ) )
{
QSizePolicy sp = sizePolicy();
sp.transpose();
setSizePolicy( sp );
setAttribute( Qt::WA_WState_OwnSizePolicy, false );
}
if ( testAttribute( Qt::WA_WState_Polished ) )
layoutSlider( true );
}
/*!
\return Orientation
\sa setOrientation()
*/
Qt::Orientation QwtSlider::orientation() const
{
return d_data->orientation;
}
/*!
\brief Change the position of the scale
\param scalePosition Position of the scale.
\sa ScalePosition, scalePosition()
*/
void QwtSlider::setScalePosition( ScalePosition scalePosition )
{
if ( d_data->scalePosition == scalePosition )
return;
d_data->scalePosition = scalePosition;
scaleDraw()->setAlignment(
qwtScaleDrawAlignment( d_data->orientation, scalePosition ) );
if ( testAttribute( Qt::WA_WState_Polished ) )
layoutSlider( true );
}
/*!
\return Position of the scale
\sa setScalePosition()
*/
QwtSlider::ScalePosition QwtSlider::scalePosition() const
{
return d_data->scalePosition;
}
/*!
\brief Change the slider's border width
The border width is used for drawing the slider handle and the
trough.
\param width Border width
\sa borderWidth()
*/
void QwtSlider::setBorderWidth( int width )
{
if ( width < 0 )
width = 0;
if ( width != d_data->borderWidth )
{
d_data->borderWidth = width;
if ( testAttribute( Qt::WA_WState_Polished ) )
layoutSlider( true );
}
}
/*!
\return the border width.
\sa setBorderWidth()
*/
int QwtSlider::borderWidth() const
{
return d_data->borderWidth;
}
/*!
\brief Change the spacing between trough and scale
A spacing of 0 means, that the backbone of the scale is covered
by the trough.
The default setting is 4 pixels.
\param spacing Number of pixels
\sa spacing();
*/
void QwtSlider::setSpacing( int spacing )
{
if ( spacing <= 0 )
spacing = 0;
if ( spacing != d_data->spacing )
{
d_data->spacing = spacing;
if ( testAttribute( Qt::WA_WState_Polished ) )
layoutSlider( true );
}
}
/*!
\return Number of pixels between slider and scale
\sa setSpacing()
*/
int QwtSlider::spacing() const
{
return d_data->spacing;
}
/*!
\brief Set the slider's handle size
When the size is empty the slider handle will be painted with a
default size depending on its orientation() and backgroundStyle().
\param size New size
\sa handleSize()
*/
void QwtSlider::setHandleSize( const QSize &size )
{
if ( size != d_data->handleSize )
{
d_data->handleSize = size;
if ( testAttribute( Qt::WA_WState_Polished ) )
layoutSlider( true );
}
}
/*!
\return Size of the handle.
\sa setHandleSize()
*/
QSize QwtSlider::handleSize() const
{
return d_data->handleSize;
}
/*!
\brief Set a scale draw
For changing the labels of the scales, it
is necessary to derive from QwtScaleDraw and
overload QwtScaleDraw::label().
\param scaleDraw ScaleDraw object, that has to be created with
new and will be deleted in ~QwtSlider() or the next
call of setScaleDraw().
\sa scaleDraw()
*/
void QwtSlider::setScaleDraw( QwtScaleDraw *scaleDraw )
{
const QwtScaleDraw *previousScaleDraw = this->scaleDraw();
if ( scaleDraw == NULL || scaleDraw == previousScaleDraw )
return;
if ( previousScaleDraw )
scaleDraw->setAlignment( previousScaleDraw->alignment() );
setAbstractScaleDraw( scaleDraw );
if ( testAttribute( Qt::WA_WState_Polished ) )
layoutSlider( true );
}
/*!
\return the scale draw of the slider
\sa setScaleDraw()
*/
const QwtScaleDraw *QwtSlider::scaleDraw() const
{
return static_cast<const QwtScaleDraw *>( abstractScaleDraw() );
}
/*!
\return the scale draw of the slider
\sa setScaleDraw()
*/
QwtScaleDraw *QwtSlider::scaleDraw()
{
return static_cast<QwtScaleDraw *>( abstractScaleDraw() );
}
//! Notify changed scale
void QwtSlider::scaleChange()
{
QwtAbstractSlider::scaleChange();
if ( testAttribute( Qt::WA_WState_Polished ) )
layoutSlider( true );
}
/*!
\brief Specify the update interval for automatic scrolling
The minimal accepted value is 50 ms.
\param interval Update interval in milliseconds
\sa setUpdateInterval()
*/
void QwtSlider::setUpdateInterval( int interval )
{
d_data->updateInterval = qMax( interval, 50 );
}
/*!
\return Update interval in milliseconds for automatic scrolling
\sa setUpdateInterval()
*/
int QwtSlider::updateInterval() const
{
return d_data->updateInterval;
}
/*!
Draw the slider into the specified rectangle.
\param painter Painter
\param sliderRect Bounding rectangle of the slider
*/
void QwtSlider::drawSlider(
QPainter *painter, const QRect &sliderRect ) const
{
QRect innerRect( sliderRect );
if ( d_data->hasTrough )
{
const int bw = d_data->borderWidth;
innerRect = sliderRect.adjusted( bw, bw, -bw, -bw );
painter->fillRect( innerRect, palette().brush( QPalette::Mid ) );
qDrawShadePanel( painter, sliderRect, palette(), true, bw, NULL );
}
const QSize handleSize = qwtHandleSize( d_data->handleSize,
d_data->orientation, d_data->hasTrough );
if ( d_data->hasGroove )
{
const int slotExtent = 4;
const int slotMargin = 4;
QRect slotRect;
if ( orientation() == Qt::Horizontal )
{
int slotOffset = qMax( 1, handleSize.width() / 2 - slotMargin );
int slotHeight = slotExtent + ( innerRect.height() % 2 );
slotRect.setWidth( innerRect.width() - 2 * slotOffset );
slotRect.setHeight( slotHeight );
}
else
{
int slotOffset = qMax( 1, handleSize.height() / 2 - slotMargin );
int slotWidth = slotExtent + ( innerRect.width() % 2 );
slotRect.setWidth( slotWidth );
slotRect.setHeight( innerRect.height() - 2 * slotOffset );
}
slotRect.moveCenter( innerRect.center() );
QBrush brush = palette().brush( QPalette::Dark );
qDrawShadePanel( painter, slotRect, palette(), true, 1 , &brush );
}
if ( isValid() )
drawHandle( painter, handleRect(), transform( value() ) );
}
/*!
Draw the thumb at a position
\param painter Painter
\param handleRect Bounding rectangle of the handle
\param pos Position of the handle marker in widget coordinates
*/
void QwtSlider::drawHandle( QPainter *painter,
const QRect &handleRect, int pos ) const
{
const int bw = d_data->borderWidth;
qDrawShadePanel( painter,
handleRect, palette(), false, bw,
&palette().brush( QPalette::Button ) );
pos++; // shade line points one pixel below
if ( orientation() == Qt::Horizontal )
{
qDrawShadeLine( painter, pos, handleRect.top() + bw,
pos, handleRect.bottom() - bw, palette(), true, 1 );
}
else // Vertical
{
qDrawShadeLine( painter, handleRect.left() + bw, pos,
handleRect.right() - bw, pos, palette(), true, 1 );
}
}
/*!
\brief Determine what to do when the user presses a mouse button.
\param pos Mouse position
\retval True, when handleRect() contains pos
\sa scrolledTo()
*/
bool QwtSlider::isScrollPosition( const QPoint &pos ) const
{
if ( handleRect().contains( pos ) )
{
const double v = ( orientation() == Qt::Horizontal )
? pos.x() : pos.y();
d_data->mouseOffset = v - transform( value() );
return true;
}
return false;
}
/*!
\brief Determine the value for a new position of the
slider handle.
\param pos Mouse position
\return Value for the mouse position
\sa isScrollPosition()
*/
double QwtSlider::scrolledTo( const QPoint &pos ) const
{
int p = ( orientation() == Qt::Horizontal )
? pos.x() : pos.y();
p -= d_data->mouseOffset;
int min = transform( lowerBound() );
int max = transform( upperBound() );
if ( min > max )
qSwap( min, max );
p = qBound( min, p, max );
return invTransform( p );
}
/*!
Mouse press event handler
\param event Mouse event
*/
void QwtSlider::mousePressEvent( QMouseEvent *event )
{
if ( isReadOnly() )
{
event->ignore();
return;
}
const QPoint pos = event->pos();
if ( isValid() && d_data->sliderRect.contains( pos ) )
{
if ( !handleRect().contains( pos ) )
{
const int markerPos = transform( value() );
d_data->stepsIncrement = pageSteps();
if ( d_data->orientation == Qt::Horizontal )
{
if ( pos.x() < markerPos )
d_data->stepsIncrement = -d_data->stepsIncrement;
}
else
{
if ( pos.y() < markerPos )
d_data->stepsIncrement = -d_data->stepsIncrement;
}
if ( isInverted() )
d_data->stepsIncrement = -d_data->stepsIncrement;
d_data->timerTick = false;
d_data->repeatTimerId = startTimer( qMax( 250, 2 * updateInterval() ) );
return;
}
}
QwtAbstractSlider::mousePressEvent( event );
}
/*!
Mouse release event handler
\param event Mouse event
*/
void QwtSlider::mouseReleaseEvent( QMouseEvent *event )
{
if ( d_data->repeatTimerId > 0 )
{
killTimer( d_data->repeatTimerId );
d_data->repeatTimerId = 0;
d_data->timerTick = false;
d_data->stepsIncrement = 0;
}
if ( d_data->pendingValueChange )
{
d_data->pendingValueChange = false;
Q_EMIT valueChanged( value() );
}
QwtAbstractSlider::mouseReleaseEvent( event );
}
/*!
Timer event handler
Handles the timer, when the mouse stays pressed
inside the sliderRect().
\param event Mouse event
*/
void QwtSlider::timerEvent( QTimerEvent *event )
{
if ( event->timerId() != d_data->repeatTimerId )
{
QwtAbstractSlider::timerEvent( event );
return;
}
if ( !isValid() )
{
killTimer( d_data->repeatTimerId );
d_data->repeatTimerId = 0;
return;
}
const double v = value();
incrementValue( d_data->stepsIncrement );
if ( v != value() )
{
if ( isTracking() )
Q_EMIT valueChanged( value() );
else
d_data->pendingValueChange = true;
Q_EMIT sliderMoved( value() );
}
if ( !d_data->timerTick )
{
// restart the timer with a shorter interval
killTimer( d_data->repeatTimerId );
d_data->repeatTimerId = startTimer( updateInterval() );
d_data->timerTick = true;
}
}
/*!
Qt paint event handler
\param event Paint event
*/
void QwtSlider::paintEvent( QPaintEvent *event )
{
QPainter painter( this );
painter.setClipRegion( event->region() );
QStyleOption opt;
opt.init(this);
style()->drawPrimitive(QStyle::PE_Widget, &opt, &painter, this);
if ( d_data->scalePosition != QwtSlider::NoScale )
{
if ( !d_data->sliderRect.contains( event->rect() ) )
scaleDraw()->draw( &painter, palette() );
}
drawSlider( &painter, d_data->sliderRect );
if ( hasFocus() )
QwtPainter::drawFocusRect( &painter, this, d_data->sliderRect );
}
/*!
Qt resize event handler
\param event Resize event
*/
void QwtSlider::resizeEvent( QResizeEvent *event )
{
Q_UNUSED( event );
layoutSlider( false );
}
/*!
Handles QEvent::StyleChange and QEvent::FontChange events
\param event Change event
*/
void QwtSlider::changeEvent( QEvent *event )
{
if ( event->type() == QEvent::StyleChange ||
event->type() == QEvent::FontChange )
{
if ( testAttribute( Qt::WA_WState_Polished ) )
layoutSlider( true );
}
QwtAbstractSlider::changeEvent( event );
}
/*!
Recalculate the slider's geometry and layout based on
the current geometry and fonts.
\param update_geometry notify the layout system and call update
to redraw the scale
*/
void QwtSlider::layoutSlider( bool update_geometry )
{
int bw = 0;
if ( d_data->hasTrough )
bw = d_data->borderWidth;
const QSize handleSize = qwtHandleSize( d_data->handleSize,
d_data->orientation, d_data->hasTrough );
QRect sliderRect = contentsRect();
/*
The marker line of the handle needs to be aligned to
the scale. But the marker is in the center
and we need space enough to display the rest of the handle.
But the scale itself usually needs margins for displaying
the tick labels, that also might needs space beyond the
backbone.
Now it depends on what needs more margins. If it is the
slider the scale gets shrunk, otherwise the slider.
*/
int scaleMargin = 0;
if ( d_data->scalePosition != QwtSlider::NoScale )
{
int d1, d2;
scaleDraw()->getBorderDistHint( font(), d1, d2 );
scaleMargin = qMax( d1, d2 ) - bw;
}
int scaleX, scaleY, scaleLength;
if ( d_data->orientation == Qt::Horizontal )
{
const int handleMargin = handleSize.width() / 2 - 1;
if ( scaleMargin > handleMargin )
{
int off = scaleMargin - handleMargin;
sliderRect.adjust( off, 0, -off, 0 );
}
scaleX = sliderRect.left() + bw + handleSize.width() / 2 - 1;
scaleLength = sliderRect.width() - handleSize.width();
}
else
{
int handleMargin = handleSize.height() / 2 - 1;
if ( scaleMargin > handleMargin )
{
int off = scaleMargin - handleMargin;
sliderRect.adjust( 0, off, 0, -off );
}
scaleY = sliderRect.top() + bw + handleSize.height() / 2 - 1;
scaleLength = sliderRect.height() - handleSize.height();
}
scaleLength -= 2 * bw;
// now align slider and scale according to the ScalePosition
if ( d_data->orientation == Qt::Horizontal )
{
const int h = handleSize.height() + 2 * bw;
if ( d_data->scalePosition == QwtSlider::TrailingScale )
{
sliderRect.setTop( sliderRect.bottom() + 1 - h );
scaleY = sliderRect.top() - d_data->spacing;
}
else
{
sliderRect.setHeight( h );
scaleY = sliderRect.bottom() + 1 + d_data->spacing;
}
}
else // Qt::Vertical
{
const int w = handleSize.width() + 2 * bw;
if ( d_data->scalePosition == QwtSlider::LeadingScale )
{
sliderRect.setWidth( w );
scaleX = sliderRect.right() + 1 + d_data->spacing;
}
else
{
sliderRect.setLeft( sliderRect.right() + 1 - w );
scaleX = sliderRect.left() - d_data->spacing;
}
}
d_data->sliderRect = sliderRect;
scaleDraw()->move( scaleX, scaleY );
scaleDraw()->setLength( scaleLength );
if ( update_geometry )
{
d_data->sizeHintCache = QSize(); // invalidate
updateGeometry();
update();
}
}
/*!
En/Disable the trough
The slider can be cutomized by showing a trough for the
handle.
\param on When true, the groove is visible
\sa hasTrough(), setGroove()
*/
void QwtSlider::setTrough( bool on )
{
if ( d_data->hasTrough != on )
{
d_data->hasTrough = on;
if ( testAttribute( Qt::WA_WState_Polished ) )
layoutSlider( true );
}
}
/*!
\return True, when the trough is visisble
\sa setTrough(), hasGroove()
*/
bool QwtSlider::hasTrough() const
{
return d_data->hasTrough;
}
/*!
En/Disable the groove
The slider can be cutomized by showing a groove for the
handle.
\param on When true, the groove is visible
\sa hasGroove(), setThrough()
*/
void QwtSlider::setGroove( bool on )
{
if ( d_data->hasGroove != on )
{
d_data->hasGroove = on;
if ( testAttribute( Qt::WA_WState_Polished ) )
layoutSlider( true );
}
}
/*!
\return True, when the groove is visisble
\sa setGroove(), hasTrough()
*/
bool QwtSlider::hasGroove() const
{
return d_data->hasGroove;
}
/*!
\return minimumSizeHint()
*/
QSize QwtSlider::sizeHint() const
{
const QSize hint = minimumSizeHint();
return hint.expandedTo( QApplication::globalStrut() );
}
/*!
\return Minimum size hint
\sa sizeHint()
*/
QSize QwtSlider::minimumSizeHint() const
{
if ( !d_data->sizeHintCache.isEmpty() )
return d_data->sizeHintCache;
const QSize handleSize = qwtHandleSize( d_data->handleSize,
d_data->orientation, d_data->hasTrough );
int bw = 0;
if ( d_data->hasTrough )
bw = d_data->borderWidth;
int sliderLength = 0;
int scaleExtent = 0;
if ( d_data->scalePosition != QwtSlider::NoScale )
{
int d1, d2;
scaleDraw()->getBorderDistHint( font(), d1, d2 );
const int scaleBorderDist = 2 * ( qMax( d1, d2 ) - bw );
int handleBorderDist;
if ( d_data->orientation == Qt::Horizontal )
handleBorderDist = handleSize.width();
else
handleBorderDist = handleSize.height();
sliderLength = scaleDraw()->minLength( font() );
if ( handleBorderDist > scaleBorderDist )
{
// We need additional space for the overlapping handle
sliderLength += handleBorderDist - scaleBorderDist;
}
scaleExtent += d_data->spacing;
scaleExtent += qCeil( scaleDraw()->extent( font() ) );
}
sliderLength = qMax( sliderLength, 84 ); // from QSlider
int w = 0;
int h = 0;
if ( d_data->orientation == Qt::Horizontal )
{
w = sliderLength;
h = handleSize.height() + 2 * bw + scaleExtent;
}
else
{
w = handleSize.width() + 2 * bw + scaleExtent;
h = sliderLength;
}
// finally add margins
int left, right, top, bottom;
getContentsMargins( &left, &top, &right, &bottom );
w += left + right;
h += top + bottom;
d_data->sizeHintCache = QSize( w, h );
return d_data->sizeHintCache;
}
/*!
\return Bounding rectangle of the slider handle
*/
QRect QwtSlider::handleRect() const
{
if ( !isValid() )
return QRect();
const int markerPos = transform( value() );
QPoint center = d_data->sliderRect.center();
if ( d_data->orientation == Qt::Horizontal )
center.setX( markerPos );
else
center.setY( markerPos );
QRect rect;
rect.setSize( qwtHandleSize( d_data->handleSize,
d_data->orientation, d_data->hasTrough ) );
rect.moveCenter( center );
return rect;
}
/*!
\return Bounding rectangle of the slider - without the scale
*/
QRect QwtSlider::sliderRect() const
{
return d_data->sliderRect;
}