TaskProgress: Add setHalfLifeTimePerTask()

Make it possible to specify expected half-life time per task.
Make TaskProgress more fluent (50 Hz).
Use exponential interpolation for TaskProgress.
Set 30 seconds half-life time for UpdateInfoPlugin.

Change-Id: I1b8a147f259caf6a11fbe06afd8cfe6d4606bb02
Reviewed-by: <github-actions-qt-creator@cristianadam.eu>
Reviewed-by: hjk <hjk@qt.io>

src/libs/utils/mathutils.cpp

@@ -24,7 +24,7 @@ int interpolateLinear(int x, int x1, int x2, int y1, int y2)
         return y2;
     const int numerator = (y2 - y1) * x + x2 * y1 - x1 * y2;
     const int denominator = x2 - x1;
-    return qRound((double)numerator / denominator);
+    return qRound(double(numerator) / denominator);
 }
 
 /*!
@@ -39,7 +39,7 @@ int interpolateTangential(int x, int xHalfLife, int y1, int y2)
         return y1;
     if (y1 == y2)
         return y1;
-    const double angle = atan2((double)x, (double)xHalfLife);
+    const double angle = atan2(double(x), double(xHalfLife));
     const double result = y1 + (y2 - y1) * angle * 2 / M_PI;
     return qRound(result);
 }
@@ -56,7 +56,7 @@ int interpolateExponential(int x, int xHalfLife, int y1, int y2)
         return y1;
     if (y1 == y2)
         return y1;
-    const double exponent = pow(0.5, (double)x / xHalfLife);
+    const double exponent = pow(0.5, double(x) / xHalfLife);
     const double result = y1 + (y2 - y1) * (1.0 - exponent);
     return qRound(result);
 }

src/plugins/coreplugin/progressmanager/taskprogress.cpp

@@ -18,7 +18,7 @@ using namespace Utils;
 namespace Core {
 
 static const int ProgressResolution = 100; // 100 discrete values
-static const int TimerInterval = 100; // 100 ms
+static const int TimerInterval = 20; // 20 ms = 50 Hz
 
 class TaskProgressPrivate : public QObject
 {
@@ -31,7 +31,6 @@ public:
     void updateProgress();
 
     int m_currentTick = 0;
-    int m_expectedTime = 1; // 1 second
 
     int m_currentProgress = 0; // from TaskTree (max value = task count)
 
@@ -40,6 +39,7 @@ public:
     QFutureWatcher<void> m_watcher;
     QFutureInterface<void> m_futureInterface;
     QPointer<FutureProgress> m_futureProgress;
+    int m_halfLifeTimePerTask = 1000; // 1000 ms
     QString m_displayName;
     FutureProgress::KeepOnFinishType m_keep = FutureProgress::HideOnFinish;
     bool m_isSubtitleVisibleInStatusBar = false;
@@ -60,8 +60,6 @@ TaskProgressPrivate::~TaskProgressPrivate()
     if (m_futureInterface.isRunning()) {
         m_futureInterface.reportCanceled();
         m_futureInterface.reportFinished();
-        // TODO: should we stop the process? Or just mark the process canceled?
-        // What happens to task in progress manager?
     }
 }
 
@@ -80,10 +78,10 @@ void TaskProgressPrivate::advanceProgress(int newValue)
 
 void TaskProgressPrivate::updateProgress()
 {
-    const int halfLife = qRound(1000.0 * m_expectedTime / TimerInterval);
+    const int halfLife = qRound(double(m_halfLifeTimePerTask) / TimerInterval);
     const int pMin = ProgressResolution * m_currentProgress;
     const int pMax = ProgressResolution * (m_currentProgress + 1);
-    const int newValue = MathUtils::interpolateTangential(m_currentTick, halfLife, pMin, pMax);
+    const int newValue = MathUtils::interpolateExponential(m_currentTick, halfLife, pMin, pMax);
     m_futureInterface.setProgressValue(newValue);
 }
 
@@ -133,6 +131,11 @@ TaskProgress::TaskProgress(TaskTree *taskTree)
     });
 }
 
+void TaskProgress::setHalfLifeTimePerTask(int msecs)
+{
+    d->m_halfLifeTimePerTask = msecs;
+}
+
 void TaskProgress::setDisplayName(const QString &name)
 {
     d->m_displayName = name;

src/plugins/coreplugin/progressmanager/taskprogress.h

@@ -20,6 +20,7 @@ class CORE_EXPORT TaskProgress : public QObject
 public:
     TaskProgress(Utils::TaskTree *taskTree); // Makes TaskProgress a child of task tree
 
+    void setHalfLifeTimePerTask(int msecs); // Default is 1000 ms
     void setDisplayName(const QString &name);
     void setKeepOnFinish(FutureProgress::KeepOnFinishType keepType);
     void setSubtitleVisibleInStatusBar(bool visible);

src/plugins/updateinfo/updateinfoplugin.cpp

@@ -151,6 +151,7 @@ void UpdateInfoPlugin::startCheckForUpdates()
     });
     connect(d->m_taskTree.get(), &TaskTree::errorOccurred, this, doCleanup);
     d->m_progress = new TaskProgress(d->m_taskTree.get());
+    d->m_progress->setHalfLifeTimePerTask(30000); // 30 seconds
     d->m_progress->setDisplayName(tr("Checking for Updates"));
     d->m_progress->setKeepOnFinish(FutureProgress::KeepOnFinishTillUserInteraction);
     d->m_progress->setSubtitleVisibleInStatusBar(true);