Track progress range in QFutureInterface::setProgressValue

Previously QFutureInterface::setProgressValue was silently ignoring
the progress range and allowed to set any progress value.
Also no checks were performed in QFutureInterface::setProgressRange,
which allowed the user to set minimum > maximum.

Add checking of the current progress range, when settings the
progress value.
Add checks for minimum and maximum values while setting the progress
range.
The implementation of the checks is mostly based on the logic
that is used in QProgressBar.
- If maximum is smaller than minimum, minimum becomes the only legal
value.
- If the current progress value falls outside the new range, the
progress value is set to be minimum.
- If both progressMinimum() and progressMaximum() return 0, the
current progress range is considered to be unused, and any progress
value can be set.
- When setting the value using setProgressValue(), if the value falls
out of the progress range, the method has no effect.

Task-number: QTBUG-84729
Change-Id: I29cf4f94b8e98e1af30dd46fbdba39c421cf66bf
Reviewed-by: Qt CI Bot <qt_ci_bot@qt-project.org>
Reviewed-by: Sona Kurazyan <sona.kurazyan@qt.io>

2 files changed, 45 insertions, 3 deletions

diff --git a/src/corelib/thread/qfutureinterface.cpp b/src/corelib/thread/qfutureinterface.cpp
index 600dd9bd3f..57ddc7407e 100644
--- a/src/corelib/thread/qfutureinterface.cpp
+++ b/src/corelib/thread/qfutureinterface.cpp
@@ -484,12 +484,29 @@ void QFutureInterfaceBase::setFilterMode(bool enable)
     resultStoreBase().setFilterMode(enable);
 }
 
+/*!
+    \internal
+    Sets the progress range'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.
+
+    The progress value is reset to be \a minimum.
+
+    The progress range usage can be disabled by using setProgressRange(0, 0).
+    In this case progress value is also reset to 0.
+
+    The behavior of this method is mostly inspired by
+    \l QProgressBar::setRange.
+*/
 void QFutureInterfaceBase::setProgressRange(int minimum, int maximum)
 {
     QMutexLocker locker(&d->m_mutex);
     d->m_progressMinimum = minimum;
-    d->m_progressMaximum = maximum;
+    d->m_progressMaximum = qMax(minimum, maximum);
     d->sendCallOut(QFutureCallOutEvent(QFutureCallOutEvent::ProgressRange, minimum, maximum));
+    d->m_progressValue = minimum;
 }
 
 void QFutureInterfaceBase::setProgressValue(int progressValue)
@@ -497,12 +514,25 @@ void QFutureInterfaceBase::setProgressValue(int progressValue)
     setProgressValueAndText(progressValue, QString());
 }
 
+/*!
+    \internal
+    In case of the \a progressValue falling out of the progress range,
+    this method has no effect.
+    Such behavior is inspired by \l QProgressBar::setValue.
+*/
 void QFutureInterfaceBase::setProgressValueAndText(int progressValue,
                                                    const QString &progressText)
 {
     QMutexLocker locker(&d->m_mutex);
     if (d->manualProgress == false)
         d->manualProgress = true;
+
+    const bool useProgressRange = (d->m_progressMaximum != 0) || (d->m_progressMinimum != 0);
+    if (useProgressRange
+        && ((progressValue < d->m_progressMinimum) || (progressValue > d->m_progressMaximum))) {
+        return;
+    }
+
     if (d->m_progressValue >= progressValue)
         return;
 
diff --git a/src/corelib/thread/qpromise.qdoc b/src/corelib/thread/qpromise.qdoc
index ae0d924668..78182323be 100644
--- a/src/corelib/thread/qpromise.qdoc
+++ b/src/corelib/thread/qpromise.qdoc
@@ -217,7 +217,16 @@
     Sets the progress range of the computation to be between \a minimum and \a
     maximum.
 
-    \sa QFuture::progressMinimum(), QFuture::progressMaximum()
+    If \a maximum is smaller than \a minimum, \a minimum becomes the only
+    legal value.
+
+    The progress value is reset to be \a minimum.
+
+    The progress range usage can be disabled by using setProgressRange(0, 0).
+    In this case progress value is also reset to 0.
+
+    \sa QFuture::progressMinimum(), QFuture::progressMaximum(),
+    QFuture::progressValue()
 */
 
 /*! \fn template<typename T> void QPromise<T>::setProgressValue(int progressValue)
@@ -226,7 +235,10 @@
     possible to only increment the progress value. This is a convenience method
     for calling setProgressValueAndText(progressValue, QString()).
 
-    \sa QFuture::progressValue()
+    In case of the \a progressValue falling out of the progress range,
+    this method has no effect.
+
+    \sa QFuture::progressValue(), setProgressRange()
 */
 
 /*! \fn template<typename T> void QPromise<T>::setProgressValueAndText(int progressValue, const QString &progressText)