Tracing: Make notes in TimelineModelAggregator mutable

When the notes model is deleted, it becomes null. The notes model
belongs to TimelineTraceManager, not to TimelineModelAggregator.

Change-Id: I0ef9312620e08c06d31bc65976a887af0ca90c33
Reviewed-by: Christian Kandeler <christian.kandeler@qt.io>

src/libs/tracing/timelinemodelaggregator.cpp

@@ -30,6 +30,7 @@
 
 #include <utils/algorithm.h>
 
+#include <QPointer>
 #include <QStringList>
 #include <QVariant>
 
@@ -38,15 +39,13 @@ namespace Timeline {
 class TimelineModelAggregator::TimelineModelAggregatorPrivate {
 public:
     QList <TimelineModel *> modelList;
-    TimelineNotesModel *notesModel;
+    QPointer<TimelineNotesModel> notesModel;
     int currentModelId = 0;
 };
 
-TimelineModelAggregator::TimelineModelAggregator(TimelineNotesModel *notes, QObject *parent)
+TimelineModelAggregator::TimelineModelAggregator(QObject *parent)
     : QObject(parent), d_ptr(new TimelineModelAggregatorPrivate)
 {
-    Q_D(TimelineModelAggregator);
-    d->notesModel = notes;
 }
 
 TimelineModelAggregator::~TimelineModelAggregator()
@@ -129,6 +128,25 @@ TimelineNotesModel *TimelineModelAggregator::notes() const
     return d->notesModel;
 }
 
+void TimelineModelAggregator::setNotes(TimelineNotesModel *notes)
+{
+    Q_D(TimelineModelAggregator);
+    if (d->notesModel == notes)
+        return;
+
+    if (d->notesModel) {
+        disconnect(d->notesModel, &QObject::destroyed,
+                   this, &TimelineModelAggregator::notesChanged);
+    }
+
+    d->notesModel = notes;
+
+    if (d->notesModel)
+        connect(d->notesModel, &QObject::destroyed, this, &TimelineModelAggregator::notesChanged);
+
+    emit notesChanged();
+}
+
 void TimelineModelAggregator::clear()
 {
     Q_D(TimelineModelAggregator);

src/libs/tracing/timelinemodelaggregator.h

@@ -35,9 +35,9 @@ class TRACING_EXPORT TimelineModelAggregator : public QObject
     Q_OBJECT
     Q_PROPERTY(int height READ height NOTIFY heightChanged)
     Q_PROPERTY(QVariantList models READ models WRITE setModels NOTIFY modelsChanged)
-    Q_PROPERTY(Timeline::TimelineNotesModel *notes READ notes CONSTANT)
+    Q_PROPERTY(Timeline::TimelineNotesModel *notes READ notes WRITE setNotes NOTIFY notesChanged)
 public:
-    TimelineModelAggregator(TimelineNotesModel *notes = nullptr, QObject *parent = nullptr);
+    TimelineModelAggregator(QObject *parent = nullptr);
     ~TimelineModelAggregator() override;
 
     int height() const;
@@ -50,6 +50,8 @@ public:
     void setModels(const QVariantList &models);
 
     TimelineNotesModel *notes() const;
+    void setNotes(TimelineNotesModel *notes);
+
     void clear();
     int modelCount() const;
     int modelIndexById(int modelId) const;
@@ -62,6 +64,7 @@ public:
 signals:
     void modelsChanged();
     void heightChanged();
+    void notesChanged();
     void updateCursorPosition();
 
 private:

src/plugins/qmlprofiler/qmlprofilertraceview.cpp

@@ -145,7 +145,8 @@ QmlProfilerTraceView::QmlProfilerTraceView(QWidget *parent, QmlProfilerViewManag
     setLayout(groupLayout);
 
     d->m_viewContainer = container;
-    d->m_modelProxy = new Timeline::TimelineModelAggregator(modelManager->notesModel(), this);
+    d->m_modelProxy = new Timeline::TimelineModelAggregator(this);
+    d->m_modelProxy->setNotes(modelManager->notesModel());
     d->m_modelManager = modelManager;
 
     QVariantList models;