q3progressdialog.cpp

奇趣公司比较新的qt/emd版本

}


/*!
  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.

  \sa setCancelButtonText()
*/

void Q3ProgressDialog::setCancelButton(QPushButton *cancelButton)
{
    delete d->cancel;
    d->cancel = cancelButton;
    if (cancelButton) {
        if (cancelButton->parentWidget() == this) {
            cancelButton->hide(); // until we resize
        } else {
            cancelButton->setParent(this, 0);
        }
        connect(d->cancel, SIGNAL(clicked()), this, SIGNAL(canceled()));
        new QShortcut(Qt::Key_Escape, this, SIGNAL(canceled()));
    }
    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 Q3ProgressDialog::setCancelButtonText(const QString &cancelButtonText)
{
    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 Q3ProgressDialog::setBar(Q3ProgressBar *bar)
{
#ifndef QT_NO_DEBUG
    if (progress() > 0)
        qWarning("Q3ProgressDialog::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 Q3ProgressDialog::wasCanceled
  \brief whether the dialog was canceled

  \sa setProgress()
*/

bool Q3ProgressDialog::wasCanceled() const
{
    return d->cancellation_flag;
}

/*!
  \property Q3ProgressDialog::wasCancelled
  \brief whether the dialog was canceled
  \since 4.2

  Use \l wasCanceled instead.
*/

/*!
    Use wasCanceled() instead.
*/
bool Q3ProgressDialog::wasCancelled() const
{
    return d->cancellation_flag;
}

/*!
  \property Q3ProgressDialog::totalSteps
  \brief the total number of steps

  The default is 0.
*/

int Q3ProgressDialog::totalSteps() const
{
    if (d && d->bar)
        return bar()->totalSteps();
    return 0;
}

void Q3ProgressDialog::setTotalSteps(int totalSteps)
{
    bar()->setTotalSteps(totalSteps);
}


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

  \sa setAutoClose(), setAutoReset()
*/

void Q3ProgressDialog::reset()
{
#ifndef QT_NO_CURSOR
    if (progress() >= 0) {
        if (d->creator)
            d->creator->setCursor(d->parentCursor);
    }
#endif
    if (d->autoClose || d->forceHide)
        hide();
    bar()->reset();
    d->cancellation_flag = false;
    d->shown_once = false;
    forceTimer->stop();
}

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

void Q3ProgressDialog::cancel()
{
    d->forceHide = true;
    reset();
    d->forceHide = false;
    d->cancellation_flag = true;
}

/*!
  \property Q3ProgressDialog::progress
  \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
  Q3ProgressDialog::totalSteps(); you can call setProgress() any number of times
  in-between.

  \warning If the progress dialog is modal
    (see Q3ProgressDialog::Q3ProgressDialog()),
    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 Q3ProgressDialog inside a paintEvent()!

  \sa totalSteps
*/

int Q3ProgressDialog::progress() const
{
    return bar()->progress();
}

void Q3ProgressDialog::setProgress(int progress)
{
    if (progress == bar()->progress() ||
         bar()->progress() == -1 && progress == bar()->totalSteps())
        return;

    bar()->setProgress(progress);

    if (d->shown_once) {
        if (isModal())
            qApp->processEvents();
    } else {
        if (progress == 0) {
#ifndef QT_NO_CURSOR
            if (d->creator) {
                d->parentCursor = d->creator->cursor();
                d->creator->setCursor(Qt::WaitCursor);
            }
#endif
            d->starttime.start();
            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;
                    if ((totalSteps() - progress) >= INT_MAX / elapsed)
                        estimate = (totalSteps() - progress) / progress * elapsed;
                    else
                        estimate = elapsed * (totalSteps() - progress) / progress;
                    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 == bar()->totalSteps() && d->autoReset)
        reset();
}

/*!
  \overload

  Sets the current amount of progress to \a progress and the total number of
  steps to \a totalSteps.

  \sa setTotalSteps()
*/

void Q3ProgressDialog::setProgress(int progress, int totalSteps)
{
    setTotalSteps(totalSteps);
    setProgress(progress);
}

/*!
  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 Q3ProgressDialog::sizeHint() const
{
    QSize sh = label()->sizeHint();
    QSize bh = bar()->sizeHint();
    int h = margin_tb*2 + bh.height() + sh.height() + spacing;
    if (d->cancel)
        h += d->cancel->sizeHint().height() + spacing;
    return QSize(qMax(200, sh.width() + 2*margin_lr), h);
}

/*!\reimp
*/
void Q3ProgressDialog::resizeEvent(QResizeEvent *)
{
    layout();
}

/*!
  \reimp
*/
void Q3ProgressDialog::changeEvent(QEvent *ev)
{
    if(ev->type() == QEvent::StyleChange)
        layout();
    QDialog::changeEvent(ev);
}

void Q3ProgressDialog::layout()
{
    int sp = spacing;
    int mtb = margin_tb;
    int mlr = qMin(width()/10, margin_lr);
    const bool centered =
        bool(style()->styleHint(QStyle::SH_ProgressDialog_CenterCancelButton, 0, this));

    QSize cs = d->cancel ? d->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 = d->cancel ? cs.height() + sp : 0;
        lh = qMax(0, height() - mtb - bh.height() - sp - cspc);

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

    if (d->cancel) {
        d->cancel->setGeometry(
            centered ? width()/2 - cs.width()/2 : width() - mlr - cs.width(),
            height() - mtb - cs.height() + sp,
            cs.width(), cs.height());
    }

    label()->setGeometry(mlr, 0, width()-mlr*2, lh);
    bar()->setGeometry(mlr, lh+sp, width()-mlr*2, bh.height());
}

/*!
    \property Q3ProgressDialog::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 Q3ProgressDialog::setMinimumDuration(int ms)
{
    d->showTime = ms;
    if (bar()->progress() == 0) {
        forceTimer->stop();
        forceTimer->start(ms);
    }
}

int Q3ProgressDialog::minimumDuration() const
{
    return d->showTime;
}


/*!
  \reimp
*/

void Q3ProgressDialog::closeEvent(QCloseEvent *e)
{
    emit canceled();
    QDialog::closeEvent(e);
}

/*!
  \property Q3ProgressDialog::autoReset
  \brief whether the progress dialog calls reset() as soon as progress() equals totalSteps()

  The default is true.

  \sa setAutoClose()
*/

void Q3ProgressDialog::setAutoReset(bool b)
{
    d->autoReset = b;
}

bool Q3ProgressDialog::autoReset() const
{
    return d->autoReset;
}

/*!
  \property Q3ProgressDialog::autoClose
  \brief whether the dialog gets hidden by reset()

  The default is true.

  \sa setAutoReset()
*/

void Q3ProgressDialog::setAutoClose(bool b)
{
    d->autoClose = b;
}

bool Q3ProgressDialog::autoClose() const
{
    return d->autoClose;
}

/*!
  \reimp
*/

void Q3ProgressDialog::showEvent(QShowEvent *e)
{
    QDialog::showEvent(e);
    int w = qMax(isVisible() ? width() : 0, sizeHint().width());
    int h = qMax(isVisible() ? height() : 0, sizeHint().height());
    resize(w, h);
    forceTimer->stop();
}

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

  \sa setMinimumDuration()
*/

void Q3ProgressDialog::forceShow()
{
    if (d->shown_once || d->cancellation_flag)
        return;

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


#endif