Tracing: Add context menu option to reset the flame graph

The double-clicking-on-blank-space method is really hard to discover.

Task-number: QTCREATORBUG-20732
Change-Id: I09e3189292c236fea0698e7cb68ea8340f9033fe
Reviewed-by: Christian Kandeler <christian.kandeler@qt.io>

src/libs/tracing/flamegraph.h

@@ -45,6 +45,7 @@ class TRACING_EXPORT FlameGraph : public QQuickItem
                NOTIFY maximumDepthChanged)
     Q_PROPERTY(int depth READ depth NOTIFY depthChanged)
     Q_PROPERTY(QPersistentModelIndex root READ root WRITE setRoot NOTIFY rootChanged)
+    Q_PROPERTY(bool zoomed READ isZoomed NOTIFY rootChanged)
     Q_PROPERTY(int selectedTypeId READ selectedTypeId WRITE setSelectedTypeId
                NOTIFY selectedTypeIdChanged)
 
@@ -83,6 +84,11 @@ public:
         return m_root;
     }
 
+    bool isZoomed() const
+    {
+        return m_root.isValid();
+    }
+
     void setRoot(const QPersistentModelIndex &root)
     {
         if (root != m_root) {

src/libs/tracing/qml/FlameGraphView.qml

@@ -42,6 +42,9 @@ ScrollView {
         flamegraph.selectedTypeId = selectedTypeId;
     }
 
+    function resetRoot() { flamegraph.resetRoot(); }
+    property bool zoomed: flamegraph.zoomed
+
     property int sizeRole: -1
     property var model: null
 

src/plugins/perfprofiler/perfprofilerflamegraphview.cpp

@@ -74,5 +74,15 @@ void PerfProfilerFlameGraphView::selectByTypeId(int typeId)
     rootObject()->setProperty("selectedTypeId", typeId);
 }
 
+void PerfProfilerFlameGraphView::resetRoot()
+{
+    QMetaObject::invokeMethod(rootObject(), "resetRoot");
+}
+
+bool PerfProfilerFlameGraphView::isZoomed() const
+{
+    return rootObject()->property("zoomed").toBool();
+}
+
 } // namespace Internal
 } // namespace PerfProfiler

src/plugins/perfprofiler/perfprofilerflamegraphview.h

@@ -41,6 +41,8 @@ public:
     ~PerfProfilerFlameGraphView();
 
     void selectByTypeId(int typeId);
+    void resetRoot();
+    bool isZoomed() const;
 
 signals:
     void gotoSourceLocation(QString file, int line, int column);

src/plugins/perfprofiler/perfprofilertool.cpp

@@ -305,9 +305,13 @@ PerfProfilerTool::PerfProfilerTool(QObject *parent) :
             m_limitToRange, &QAction::trigger);
     connect(menu1->addAction(tr("Show Full Range")), &QAction::triggered,
             m_showFullRange, &QAction::trigger);
+    QAction *resetAction = menu1->addAction(tr("Reset Flame Graph"));
+    connect(resetAction, &QAction::triggered,
+            m_flameGraphView, &PerfProfilerFlameGraphView::resetRoot);
     m_flameGraphView->setContextMenuPolicy(Qt::CustomContextMenu);
     connect(m_flameGraphView, &QWidget::customContextMenuRequested,
-            menu1, [menu1, this](const QPoint &pos) {
+            menu1, [this, menu1, resetAction](const QPoint &pos) {
+        resetAction->setEnabled(m_flameGraphView->isZoomed());
         menu1->exec(m_flameGraphView->mapToGlobal(pos));
     });
 

src/plugins/qmlprofiler/flamegraphview.cpp

@@ -93,9 +93,14 @@ void FlameGraphView::contextMenuEvent(QContextMenuEvent *ev)
     QAction *getGlobalStatsAction = menu.addAction(tr("Show Full Range"));
     if (!m_model->modelManager()->isRestrictedToRange())
         getGlobalStatsAction->setEnabled(false);
+    QAction *resetAction = menu.addAction(tr("Reset Flame Graph"));
+    resetAction->setEnabled(m_content->rootObject()->property("zoomed").toBool());
 
-    if (menu.exec(position) == getGlobalStatsAction)
+    const QAction *selected = menu.exec(position);
+    if (selected == getGlobalStatsAction)
         emit showFullRange();
+    else if (selected == resetAction)
+        QMetaObject::invokeMethod(m_content->rootObject(), "resetRoot");
 }
 
 } // namespace Internal