QmlProfiler: Handle enable and show signals for zoomslider in C++

As it's hard to pass arguments for signals from non-QML-mapped objects
to QML objects handle the signal in C++ instead and just directly set
the properties.

Task-number: QTCREATORBUG-10943
Change-Id: I039f6938db3d7e64ca1a4bcff2f0f6aa79c65219
Reviewed-by: Kai Koehne <kai.koehne@digia.com>
Reviewed-by: Eike Ziller <eike.ziller@digia.com>

src/plugins/qmlprofiler/qml/MainView.qml

@@ -514,8 +514,6 @@ Rectangle {
         x: 0
         y: 0
 
-        function toggleEnabled() {enabled = !enabled}
-        function toggleVisible() {visible = !visible}
         function updateZoomLevel() {
             zoomSlider.externalUpdate = true;
             zoomSlider.value = Math.pow((view.endTime - view.startTime) / qmlProfilerModelProxy.traceDuration(), 1 / zoomSlider.exponent) * zoomSlider.maximumValue;

src/plugins/qmlprofiler/qmlprofilertraceview.cpp

@@ -192,10 +192,22 @@ void QmlProfilerTraceView::reset()
     connect(this, SIGNAL(jumpToNext()), rootObject, SLOT(nextEvent()));
     connect(rootObject, SIGNAL(selectedEventChanged(int)), this, SIGNAL(selectedEventChanged(int)));
     connect(rootObject, SIGNAL(changeToolTip(QString)), this, SLOT(updateToolTip(QString)));
+    connect(this, SIGNAL(enableToolbar(bool)), this, SLOT(setZoomSliderEnabled(bool)));
+    connect(this, SIGNAL(showZoomSlider(bool)), this, SLOT(setZoomSliderVisible(bool)));
+}
 
-    QObject *zoomSlider = rootObject->findChild<QObject*>(QLatin1String("zoomSliderToolBar"));
-    connect(this, SIGNAL(enableToolbar(bool)), zoomSlider, SLOT(toggleEnabled()));
-    connect(this, SIGNAL(showZoomSlider(bool)), zoomSlider, SLOT(toggleVisible()));
+void QmlProfilerTraceView::setZoomSliderEnabled(bool enabled)
+{
+    QQuickItem *zoomSlider = d->m_mainView->rootObject()->findChild<QQuickItem*>(QLatin1String("zoomSliderToolBar"));
+    if (zoomSlider->isEnabled() != enabled)
+        zoomSlider->setEnabled(enabled);
+}
+
+void QmlProfilerTraceView::setZoomSliderVisible(bool visible)
+{
+    QQuickItem *zoomSlider = d->m_mainView->rootObject()->findChild<QQuickItem*>(QLatin1String("zoomSliderToolBar"));
+    if (zoomSlider->isVisible() != visible)
+        zoomSlider->setVisible(visible);
 }
 
 QWidget *QmlProfilerTraceView::createToolbar()

src/plugins/qmlprofiler/qmlprofilertraceview.h

@@ -102,6 +102,8 @@ private slots:
     void profilerStateChanged();
     void clientRecordingChanged();
     void serverRecordingChanged();
+    void setZoomSliderEnabled(bool enabled);
+    void setZoomSliderVisible(bool visible);
 
 signals:
     void gotoSourceLocation(const QString &fileUrl, int lineNumber, int columNumber);