summaryrefslogtreecommitdiffstats
path: root/src/widgets/dialogs/qprogressdialog.cpp
blob: 94d3928c8b9e930e29099b9f7bdd6a7e114f3506 (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
/****************************************************************************
**
** Copyright (C) 2016 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the QtWidgets module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 3 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL3 included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 3 requirements
** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 2.0 or (at your option) the GNU General
** Public license version 3 or any later version approved by the KDE Free
** Qt Foundation. The licenses are as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
** included in the packaging of this file. Please review the following
** information to ensure the GNU General Public License requirements will
** be met: https://www.gnu.org/licenses/gpl-2.0.html and
** https://www.gnu.org/licenses/gpl-3.0.html.
**
** $QT_END_LICENSE$
**
****************************************************************************/

#include "qprogressdialog.h"

#include "qshortcut.h"
#include "qpainter.h"
#include "qdrawutil.h"
#include "qlabel.h"
#include "qprogressbar.h"
#include "qapplication.h"
#include "qstyle.h"
#include "qpushbutton.h"
#include "qtimer.h"
#include "qelapsedtimer.h"
#include <private/qdialog_p.h>
#include <limits.h>

QT_BEGIN_NAMESPACE

// If the operation is expected to take this long (as predicted by
// progress time), show the progress dialog.
static const int defaultShowTime = 4000;
// Wait at least this long before attempting to make a prediction.
static const int minWaitTime = 50;

class QProgressDialogPrivate : public QDialogPrivate
{
    Q_DECLARE_PUBLIC(QProgressDialog)

public:
    QProgressDialogPrivate() : label(nullptr), cancel(nullptr), bar(nullptr),
        shown_once(false),
        cancellation_flag(false),
        setValue_called(false),
        showTime(defaultShowTime),
#ifndef QT_NO_SHORTCUT
        escapeShortcut(nullptr),
#endif
        useDefaultCancelText(false)
    {
    }

    void init(const QString &labelText, const QString &cancelText, int min, int max);
    void layout();
    void retranslateStrings();
    void setCancelButtonText(const QString &cancelButtonText);
    void adoptChildWidget(QWidget *c);
    void ensureSizeIsAtLeastSizeHint();
    void _q_disconnectOnClose();

    QLabel *label;
    QPushButton *cancel;
    QProgressBar *bar;
    QTimer *forceTimer;
    bool shown_once;
    bool cancellation_flag;
    bool setValue_called;
    QElapsedTimer starttime;
    int showTime;
    bool autoClose;
    bool autoReset;
    bool forceHide;
#ifndef QT_NO_SHORTCUT
    QShortcut *escapeShortcut;
#endif
    bool useDefaultCancelText;
    QPointer<QObject> receiverToDisconnectOnClose;
    QByteArray memberToDisconnectOnClose;
};

void QProgressDialogPrivate::init(const QString &labelText, const QString &cancelText,
                                  int min, int max)
{
    Q_Q(QProgressDialog);
    label = new QLabel(labelText, q);
    bar = new QProgressBar(q);
    bar->setRange(min, max);
    int align = q->style()->styleHint(QStyle::SH_ProgressDialog_TextLabelAlignment, nullptr, q);
    label->setAlignment(Qt::Alignment(align));
    autoClose = true;
    autoReset = true;
    forceHide = false;
    QObject::connect(q, SIGNAL(canceled()), q, SLOT(cancel()));
    forceTimer = new QTimer(q);
    QObject::connect(forceTimer, SIGNAL(timeout()), q, SLOT(forceShow()));
    if (useDefaultCancelText) {
        retranslateStrings();
    } else {
        q->setCancelButtonText(cancelText);
    }
    starttime.start();
    forceTimer->start(showTime);
}

void QProgressDialogPrivate::layout()
{
    Q_Q(QProgressDialog);
    int sp = q->style()->pixelMetric(QStyle::PM_LayoutVerticalSpacing, nullptr, q);
    int mb = q->style()->pixelMetric(QStyle::PM_LayoutBottomMargin, nullptr, q);
    int ml = qMin(q->width() / 10, q->style()->pixelMetric(QStyle::PM_LayoutLeftMargin, nullptr, q));
    int mr = qMin(q->width() / 10, q->style()->pixelMetric(QStyle::PM_LayoutRightMargin, nullptr, q));
    const bool centered =
        bool(q->style()->styleHint(QStyle::SH_ProgressDialog_CenterCancelButton, nullptr, q));

    int additionalSpacing = 0;
    QSize cs = cancel ? cancel->sizeHint() : QSize(0,0);
    QSize bh = bar->sizeHint();
    int cspc;
    int lh = 0;

    // Find spacing and sizes that fit.  It is important that a progress
    // dialog can be made very small if the user demands it so.
    for (int attempt=5; attempt--;) {
        cspc = cancel ? cs.height() + sp : 0;
        lh = qMax(0, q->height() - mb - bh.height() - sp - cspc);

        if (lh < q->height()/4) {
            // Getting cramped
            sp /= 2;
            mb /= 2;
            if (cancel) {
                cs.setHeight(qMax(4,cs.height()-sp-2));
            }
            bh.setHeight(qMax(4,bh.height()-sp-1));
        } else {
            break;
        }
    }

    if (cancel) {
        cancel->setGeometry(
            centered ? q->width()/2 - cs.width()/2 : q->width() - mr - cs.width(),
            q->height() - mb - cs.height(),
            cs.width(), cs.height());
    }

    if (label)
        label->setGeometry(ml, additionalSpacing, q->width() - ml - mr, lh);
    bar->setGeometry(ml, lh + sp + additionalSpacing, q->width() - ml - mr, bh.height());
}

void QProgressDialogPrivate::retranslateStrings()
{
    if (useDefaultCancelText)
        setCancelButtonText(QProgressDialog::tr("Cancel"));
}

void QProgressDialogPrivate::_q_disconnectOnClose()
{
    Q_Q(QProgressDialog);
    if (receiverToDisconnectOnClose) {
        QObject::disconnect(q, SIGNAL(canceled()), receiverToDisconnectOnClose,
                            memberToDisconnectOnClose);
        receiverToDisconnectOnClose = nullptr;
    }
    memberToDisconnectOnClose.clear();
}

/*!
  \class QProgressDialog
  \brief The QProgressDialog class provides feedback on the progress of a slow operation.
  \ingroup standard-dialogs
  \inmodule QtWidgets


  A progress dialog is used to give the user an indication of how long
  an operation is going to take, and to demonstrate that the
  application has not frozen. It can also give the user an opportunity
  to abort the operation.

  A common problem with progress dialogs is that it is difficult to know
  when to use them; operations take different amounts of time on different
  hardware.  QProgressDialog offers a solution to this problem:
  it estimates the time the operation will take (based on time for
  steps), and only shows itself if that estimate is beyond minimumDuration()
  (4 seconds by default).

  Use setMinimum() and setMaximum() or the constructor to set the number of
  "steps" in the operation and call setValue() as the operation
  progresses. The number of steps can be chosen arbitrarily. It can be the
  number of files copied, the number of bytes received, the number of
  iterations through the main loop of your algorithm, or some other
  suitable unit. Progress starts at the value set by setMinimum(),
  and the progress dialog shows that the operation has finished when
  you call setValue() with the value set by setMaximum() as its argument.

  The dialog automatically resets and hides itself at the end of the
  operation.  Use setAutoReset() and setAutoClose() to change this
  behavior. Note that if you set a new maximum (using setMaximum() or
  setRange()) that equals your current value(), the dialog will not
  close regardless.

  There are two ways of using QProgressDialog: modal and modeless.

  Compared to a modeless QProgressDialog, a modal QProgressDialog is simpler
  to use for the programmer. Do the operation in a loop, call \l setValue() at
  intervals, and check for cancellation with wasCanceled(). For example:

  \snippet dialogs/dialogs.cpp 3

  A modeless progress dialog is suitable for operations that take
  place in the background, where the user is able to interact with the
  application. Such operations are typically based on QTimer (or
  QObject::timerEvent()) or QSocketNotifier; or performed
  in a separate thread. A QProgressBar in the status bar of your main window
  is often an alternative to a modeless progress dialog.

  You need to have an event loop to be running, connect the
  canceled() signal to a slot that stops the operation, and call \l
  setValue() at intervals. For example:

  \snippet dialogs/dialogs.cpp 4
  \codeline
  \snippet dialogs/dialogs.cpp 5
  \codeline
  \snippet dialogs/dialogs.cpp 6

  In both modes the progress dialog may be customized by
  replacing the child widgets with custom widgets by using setLabel(),
  setBar(), and setCancelButton().
  The functions setLabelText() and setCancelButtonText()
  set the texts shown.

  \image fusion-progressdialog.png A progress dialog shown in the Fusion widget style.

  \sa QDialog, QProgressBar, {fowler}{GUI Design Handbook: Progress Indicator},
      {Find Files Example}, {Pixelator Example}
*/


/*!
  Constructs a progress dialog.

  Default settings:
  \list
  \li The label text is empty.
  \li The cancel button text is (translated) "Cancel".
  \li minimum is 0;
  \li maximum is 100
  \endlist

  The \a parent argument is dialog's parent widget. The widget flags, \a f, are
  passed to the QDialog::QDialog() constructor.

  \sa setLabelText(), setCancelButtonText(), setCancelButton(),
  setMinimum(), setMaximum()
*/

QProgressDialog::QProgressDialog(QWidget *parent, Qt::WindowFlags f)
    : QDialog(*(new QProgressDialogPrivate), parent, f)
{
    Q_D(QProgressDialog);
    d->useDefaultCancelText = true;
    d->init(QString::fromLatin1(""), QString(), 0, 100);
}

/*!
  Constructs a progress dialog.

   The \a labelText is the text used to remind the user what is progressing.

   The \a cancelButtonText is the text to display on the cancel button.  If
   QString() is passed then no cancel button is shown.

   The \a minimum and \a maximum is the number of steps in the operation for
   which this progress dialog shows progress.  For example, if the
   operation is to examine 50 files, this value minimum value would be 0,
   and the maximum would be 50. Before examining the first file, call
   setValue(0). As each file is processed call setValue(1), setValue(2),
   etc., finally calling setValue(50) after examining the last file.

   The \a parent argument is the dialog's parent widget. The parent, \a parent, and
   widget flags, \a f, are passed to the QDialog::QDialog() constructor.

  \sa setLabelText(), setLabel(), setCancelButtonText(), setCancelButton(),
  setMinimum(), setMaximum()
*/

QProgressDialog::QProgressDialog(const QString &labelText,
                                 const QString &cancelButtonText,
                                 int minimum, int maximum,
                                 QWidget *parent, Qt::WindowFlags f)
    : QDialog(*(new QProgressDialogPrivate), parent, f)
{
    Q_D(QProgressDialog);
    d->init(labelText, cancelButtonText, minimum, maximum);
}


/*!
  Destroys the progress dialog.
*/

QProgressDialog::~QProgressDialog()
{
}

/*!
  \fn void QProgressDialog::canceled()

  This signal is emitted when the cancel button is clicked.
  It is connected to the cancel() slot by default.

  \sa wasCanceled()
*/


/*!
  Sets the label to \a label. The progress dialog resizes to fit. The
  label becomes owned by the progress dialog and will be deleted when
  necessary, so do not pass the address of an object on the stack.

  \sa setLabelText()
*/

void QProgressDialog::setLabel(QLabel *label)
{
    Q_D(QProgressDialog);
    if (label == d->label) {
        if (Q_UNLIKELY(label))
            qWarning("QProgressDialog::setLabel: Attempt to set the same label again");
        return;
    }
    delete d->label;
    d->label = label;
    d->adoptChildWidget(label);
}


/*!
  \property QProgressDialog::labelText
  \brief the label's text

  The default text is an empty string.
*/

QString QProgressDialog::labelText() const
{
    Q_D(const QProgressDialog);
    if (d->label)
        return d->label->text();
    return QString();
}

void QProgressDialog::setLabelText(const QString &text)
{
    Q_D(QProgressDialog);
    if (d->label) {
        d->label->setText(text);
        d->ensureSizeIsAtLeastSizeHint();
    }
}


/*!
  Sets the cancel button to the push button, \a cancelButton. The
  progress dialog takes ownership of this button which will be deleted
  when necessary, so do not pass the address of an object that is on
  the stack, i.e. use new() to create the button.  If \nullptr is passed,
  no cancel button will be shown.

  \sa setCancelButtonText()
*/

void QProgressDialog::setCancelButton(QPushButton *cancelButton)
{
    Q_D(QProgressDialog);
    if (d->cancel == cancelButton) {
        if (Q_UNLIKELY(cancelButton))
            qWarning("QProgressDialog::setCancelButton: Attempt to set the same button again");
        return;
    }
    delete d->cancel;
    d->cancel = cancelButton;
    if (cancelButton) {
        connect(d->cancel, SIGNAL(clicked()), this, SIGNAL(canceled()));
#ifndef QT_NO_SHORTCUT
        // FIXME: This only registers the primary key sequence of the cancel action
        d->escapeShortcut = new QShortcut(QKeySequence::Cancel, this, SIGNAL(canceled()));
#endif
    } else {
#ifndef QT_NO_SHORTCUT
        delete d->escapeShortcut;
        d->escapeShortcut = nullptr;
#endif
    }
    d->adoptChildWidget(cancelButton);
}

/*!
  Sets the cancel button's text to \a cancelButtonText.  If the text
  is set to QString() then it will cause the cancel button to be
  hidden and deleted.

  \sa setCancelButton()
*/

void QProgressDialog::setCancelButtonText(const QString &cancelButtonText)
{
    Q_D(QProgressDialog);
    d->useDefaultCancelText = false;
    d->setCancelButtonText(cancelButtonText);
}

void QProgressDialogPrivate::setCancelButtonText(const QString &cancelButtonText)
{
    Q_Q(QProgressDialog);

    if (!cancelButtonText.isNull()) {
        if (cancel) {
            cancel->setText(cancelButtonText);
        } else {
            q->setCancelButton(new QPushButton(cancelButtonText, q));
        }
    } else {
        q->setCancelButton(nullptr);
    }
    ensureSizeIsAtLeastSizeHint();
}


/*!
  Sets the progress bar widget to \a bar. The progress dialog resizes to
  fit. The progress dialog takes ownership of the progress \a bar which
  will be deleted when necessary, so do not use a progress bar
  allocated on the stack.
*/

void QProgressDialog::setBar(QProgressBar *bar)
{
    Q_D(QProgressDialog);
    if (Q_UNLIKELY(!bar)) {
        qWarning("QProgressDialog::setBar: Cannot set a null progress bar");
        return;
    }
#ifndef QT_NO_DEBUG
    if (Q_UNLIKELY(value() > 0))
        qWarning("QProgressDialog::setBar: Cannot set a new progress bar "
                  "while the old one is active");
#endif
    if (Q_UNLIKELY(bar == d->bar)) {
        qWarning("QProgressDialog::setBar: Attempt to set the same progress bar again");
        return;
    }
    delete d->bar;
    d->bar = bar;
    d->adoptChildWidget(bar);
}

void QProgressDialogPrivate::adoptChildWidget(QWidget *c)
{
    Q_Q(QProgressDialog);

    if (c) {
        if (c->parentWidget() == q)
            c->hide(); // until after ensureSizeIsAtLeastSizeHint()
        else
            c->setParent(q, { });
    }
    ensureSizeIsAtLeastSizeHint();
    if (c)
        c->show();
}

void QProgressDialogPrivate::ensureSizeIsAtLeastSizeHint()
{
    Q_Q(QProgressDialog);

    QSize size = q->sizeHint();
    if (q->isVisible())
        size = size.expandedTo(q->size());
    q->resize(size);
}


/*!
  \property QProgressDialog::wasCanceled
  \brief whether the dialog was canceled
*/

bool QProgressDialog::wasCanceled() const
{
    Q_D(const QProgressDialog);
    return d->cancellation_flag;
}


/*!
    \property QProgressDialog::maximum
    \brief the highest value represented by the progress bar

    The default is 100.

    \sa minimum, setRange()
*/

int QProgressDialog::maximum() const
{
    Q_D(const QProgressDialog);
    return d->bar->maximum();
}

void QProgressDialog::setMaximum(int maximum)
{
    Q_D(QProgressDialog);
    d->bar->setMaximum(maximum);
}

/*!
    \property QProgressDialog::minimum
    \brief the lowest value represented by the progress bar

    The default is 0.

    \sa maximum, setRange()
*/

int QProgressDialog::minimum() const
{
    Q_D(const QProgressDialog);
    return d->bar->minimum();
}

void QProgressDialog::setMinimum(int minimum)
{
    Q_D(QProgressDialog);
    d->bar->setMinimum(minimum);
}

/*!
    Sets the progress dialog's minimum and maximum values
    to \a minimum and \a maximum, respectively.

    If \a maximum is smaller than \a minimum, \a minimum becomes the only
    legal value.

    If the current value falls outside the new range, the progress
    dialog is reset with reset().

    \sa minimum, maximum
*/
void QProgressDialog::setRange(int minimum, int maximum)
{
    Q_D(QProgressDialog);
    d->bar->setRange(minimum, maximum);
}


/*!
  Resets the progress dialog.
  The progress dialog becomes hidden if autoClose() is true.

  \sa setAutoClose(), setAutoReset()
*/

void QProgressDialog::reset()
{
    Q_D(QProgressDialog);
    if (d->autoClose || d->forceHide)
        hide();
    d->bar->reset();
    d->cancellation_flag = false;
    d->shown_once = false;
    d->setValue_called = false;
    d->forceTimer->stop();

    /*
        I wish we could disconnect the user slot provided to open() here but
        unfortunately reset() is usually called before the slot has been invoked.
        (reset() is itself invoked when canceled() is emitted.)
    */
    if (d->receiverToDisconnectOnClose)
        QMetaObject::invokeMethod(this, "_q_disconnectOnClose", Qt::QueuedConnection);
}

/*!
  Resets the progress dialog. wasCanceled() becomes true until
  the progress dialog is reset.
  The progress dialog becomes hidden.
*/

void QProgressDialog::cancel()
{
    Q_D(QProgressDialog);
    d->forceHide = true;
    reset();
    d->forceHide = false;
    d->cancellation_flag = true;
}


int QProgressDialog::value() const
{
    Q_D(const QProgressDialog);
    return d->bar->value();
}

/*!
  \property QProgressDialog::value
  \brief the current amount of progress made.

  For the progress dialog to work as expected, you should initially set
  this property to QProgressDialog::minimum() and finally set it to
  QProgressDialog::maximum(); you can call setValue() any number of times
  in-between.

  \warning If the progress dialog is modal
    (see QProgressDialog::QProgressDialog()),
    setValue() calls QCoreApplication::processEvents(), so take care that
    this does not cause undesirable re-entrancy in your code. For example,
    don't use a QProgressDialog inside a paintEvent()!

  \sa minimum, maximum
*/
void QProgressDialog::setValue(int progress)
{
    Q_D(QProgressDialog);
    if (d->setValue_called && progress == d->bar->value())
        return;

    d->bar->setValue(progress);

    if (d->shown_once) {
        if (isModal())
            QCoreApplication::processEvents();
    } else {
        if ((!d->setValue_called && progress == 0 /* for compat with Qt < 5.4 */) || progress == minimum()) {
            d->starttime.start();
            d->forceTimer->start(d->showTime);
            d->setValue_called = true;
            return;
        } else {
            d->setValue_called = true;
            bool need_show;
            int elapsed = d->starttime.elapsed();
            if (elapsed >= d->showTime) {
                need_show = true;
            } else {
                if (elapsed > minWaitTime) {
                    int estimate;
                    int totalSteps = maximum() - minimum();
                    int myprogress = progress - minimum();
                    if (myprogress == 0) myprogress = 1;
                    if ((totalSteps - myprogress) >= INT_MAX / elapsed)
                        estimate = (totalSteps - myprogress) / myprogress * elapsed;
                    else
                        estimate = elapsed * (totalSteps - myprogress) / myprogress;
                    need_show = estimate >= d->showTime;
                } else {
                    need_show = false;
                }
            }
            if (need_show) {
                d->ensureSizeIsAtLeastSizeHint();
                show();
                d->shown_once = true;
            }
        }
    }

    if (progress == d->bar->maximum() && d->autoReset)
        reset();
}

/*!
  Returns a size that fits the contents of the progress dialog.
  The progress dialog resizes itself as required, so you should not
  need to call this yourself.
*/

QSize QProgressDialog::sizeHint() const
{
    Q_D(const QProgressDialog);
    QSize sh = d->label ? d->label->sizeHint() : QSize(0, 0);
    QSize bh = d->bar->sizeHint();
    int margin = style()->pixelMetric(QStyle::PM_DefaultTopLevelMargin);
    int spacing = style()->pixelMetric(QStyle::PM_DefaultLayoutSpacing);
    int h = margin * 2 + bh.height() + sh.height() + spacing;
    if (d->cancel)
        h += d->cancel->sizeHint().height() + spacing;
    return QSize(qMax(200, sh.width() + 2 * margin), h);
}

/*!\reimp
*/
void QProgressDialog::resizeEvent(QResizeEvent *)
{
    Q_D(QProgressDialog);
    d->layout();
}

/*!
  \reimp
*/
void QProgressDialog::changeEvent(QEvent *ev)
{
    Q_D(QProgressDialog);
    if (ev->type() == QEvent::StyleChange) {
        d->layout();
    } else if (ev->type() == QEvent::LanguageChange) {
        d->retranslateStrings();
    }
    QDialog::changeEvent(ev);
}

/*!
    \property QProgressDialog::minimumDuration
    \brief the time that must pass before the dialog appears

    If the expected duration of the task is less than the
    minimumDuration, the dialog will not appear at all. This prevents
    the dialog popping up for tasks that are quickly over. For tasks
    that are expected to exceed the minimumDuration, the dialog will
    pop up after the minimumDuration time or as soon as any progress
    is set.

    If set to 0, the dialog is always shown as soon as any progress is
    set. The default is 4000 milliseconds.
*/
void QProgressDialog::setMinimumDuration(int ms)
{
    Q_D(QProgressDialog);
    d->showTime = ms;
    if (d->bar->value() == d->bar->minimum()) {
        d->forceTimer->stop();
        d->forceTimer->start(ms);
    }
}

int QProgressDialog::minimumDuration() const
{
    Q_D(const QProgressDialog);
    return d->showTime;
}


/*!
  \reimp
*/

void QProgressDialog::closeEvent(QCloseEvent *e)
{
    emit canceled();
    QDialog::closeEvent(e);
}

/*!
  \property QProgressDialog::autoReset
  \brief whether the progress dialog calls reset() as soon as value() equals maximum()

  The default is true.

  \sa setAutoClose()
*/

void QProgressDialog::setAutoReset(bool b)
{
    Q_D(QProgressDialog);
    d->autoReset = b;
}

bool QProgressDialog::autoReset() const
{
    Q_D(const QProgressDialog);
    return d->autoReset;
}

/*!
  \property QProgressDialog::autoClose
  \brief whether the dialog gets hidden by reset()

  The default is true.

  \sa setAutoReset()
*/

void QProgressDialog::setAutoClose(bool close)
{
    Q_D(QProgressDialog);
    d->autoClose = close;
}

bool QProgressDialog::autoClose() const
{
    Q_D(const QProgressDialog);
    return d->autoClose;
}

/*!
  \reimp
*/

void QProgressDialog::showEvent(QShowEvent *e)
{
    Q_D(QProgressDialog);
    QDialog::showEvent(e);
    d->ensureSizeIsAtLeastSizeHint();
    d->forceTimer->stop();
}

/*!
  Shows the dialog if it is still hidden after the algorithm has been started
  and minimumDuration milliseconds have passed.

  \sa setMinimumDuration()
*/

void QProgressDialog::forceShow()
{
    Q_D(QProgressDialog);
    d->forceTimer->stop();
    if (d->shown_once || d->cancellation_flag)
        return;

    show();
    d->shown_once = true;
}

/*!
    \since 4.5

    Opens the dialog and connects its canceled() signal to the slot specified
    by \a receiver and \a member.

    The signal will be disconnected from the slot when the dialog is closed.
*/
void QProgressDialog::open(QObject *receiver, const char *member)
{
    Q_D(QProgressDialog);
    connect(this, SIGNAL(canceled()), receiver, member);
    d->receiverToDisconnectOnClose = receiver;
    d->memberToDisconnectOnClose = member;
    QDialog::open();
}

QT_END_NAMESPACE

#include "moc_qprogressdialog.cpp"