qprogressdialog.cpp

奇趣公司比较新的qt/emd版本

        delete d->escapeShortcut;
        d->escapeShortcut = 0;
#endif
    }
    int w = qMax(isVisible() ? width() : 0, sizeHint().width());
    int h = qMax(isVisible() ? height() : 0, sizeHint().height());
    resize(w, h);
    if (cancelButton)
        cancelButton->show();
}

/*!
  Sets the cancel button's text to \a cancelButtonText.
  \sa setCancelButton()
*/

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

    if (!cancelButtonText.isNull()) {
        if (d->cancel)
            d->cancel->setText(cancelButtonText);
        else
            setCancelButton(new QPushButton(cancelButtonText, this));
    } else {
        setCancelButton(0);
    }
    int w = qMax(isVisible() ? width() : 0, sizeHint().width());
    int h = qMax(isVisible() ? height() : 0, sizeHint().height());
    resize(w, h);
}


/*!
  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);
#ifndef QT_NO_DEBUG
    if (value() > 0)
        qWarning("QProgressDialog::setBar: Cannot set a new progress bar "
                  "while the old one is active");
#endif
    delete d->bar;
    d->bar = bar;
    int w = qMax(isVisible() ? width() : 0, sizeHint().width());
    int h = qMax(isVisible() ? height() : 0, sizeHint().height());
    resize(w, h);
}


/*!
  \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 0.

    \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);
#ifndef QT_NO_CURSOR
    if (value() >= 0) {
        if (parentWidget())
            parentWidget()->setCursor(d->parentCursor);
    }
#endif
    if (d->autoClose || d->forceHide)
        hide();
    d->bar->reset();
    d->cancellation_flag = false;
    d->shown_once = false;
    d->forceTimer->stop();
}

/*!
  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 0 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()),
    this function calls QApplication::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 (progress == d->bar->value() ||
         d->bar->value() == -1 && progress == d->bar->maximum())
        return;

    d->bar->setValue(progress);

    if (d->shown_once) {
        if (isModal())
            qApp->processEvents();
    } else {
        if (progress == 0) {
            d->starttime.start();
            d->forceTimer->start(d->showTime);
            return;
        } else {
            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 ((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) {
                int w = qMax(isVisible() ? width() : 0, sizeHint().width());
                int h = qMax(isVisible() ? height() : 0, sizeHint().height());
                resize(w, h);
                show();
                d->shown_once = true;
            }
        }
#ifdef Q_WS_MAC
        QApplication::flush();
#endif
    }

    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->sizeHint();
    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() == 0) {
        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 progress() equals totalSteps()

  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 b)
{
    Q_D(QProgressDialog);
    d->autoClose = b;
}

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

/*!
  \reimp
*/

void QProgressDialog::showEvent(QShowEvent *e)
{
    Q_D(QProgressDialog);
    QDialog::showEvent(e);
    int w = qMax(isVisible() ? width() : 0, sizeHint().width());
    int h = qMax(isVisible() ? height() : 0, sizeHint().height());
    resize(w, h);
    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);
    if (d->shown_once || d->cancellation_flag)
        return;

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

#endif