QmlProfiler: Center trace view vertically around newly selected items

It's rather unintuitive if it only centers horizontally.

Change-Id: I9245da0b26fccc14a100804715d09aaa82059413
Reviewed-by: Kai Koehne <kai.koehne@digia.com>

src/plugins/qmlprofiler/qml/MainView.qml

@@ -141,6 +141,13 @@ Rectangle {
             recenter((qmlProfilerModelProxy.startTime(modelIndex, itemIndex) +
                       qmlProfilerModelProxy.endTime(modelIndex, itemIndex)) / 2);
         }
+        var row = qmlProfilerModelProxy.row(modelIndex, itemIndex);
+        var totalRowOffset = qmlProfilerModelProxy.modelOffset(modelIndex) +
+                qmlProfilerModelProxy.rowOffset(modelIndex, row);
+        if (totalRowOffset > flick.contentY + flick.height ||
+                totalRowOffset + qmlProfilerModelProxy.rowHeight(modelIndex, row) < flick.contentY)
+            flick.contentY = Math.min(flick.contentHeight - flick.height,
+                                      Math.max(0, totalRowOffset - flick.height / 2));
     }
 
     function hideRangeDetails() {

src/plugins/qmlprofiler/timelinemodelaggregator.cpp

@@ -65,10 +65,7 @@ TimelineModelAggregator::~TimelineModelAggregator()
 
 int TimelineModelAggregator::height() const
 {
-    int ret = 0;
-    for (int i = 0; i < d->modelList.length(); ++i)
-        ret += d->modelList[i]->height();
-    return ret;
+    return modelOffset(d->modelList.length());
 }
 
 void TimelineModelAggregator::setModelManager(QmlProfilerModelManager *modelManager)
@@ -133,6 +130,14 @@ bool TimelineModelAggregator::isEmpty() const
     return true;
 }
 
+int TimelineModelAggregator::modelOffset(int modelIndex) const
+{
+    int ret = 0;
+    for (int i = 0; i < modelIndex; ++i)
+        ret += d->modelList[i]->height();
+    return ret;
+}
+
 int TimelineModelAggregator::rowHeight(int modelIndex, int row) const
 {
     return d->modelList[modelIndex]->rowHeight(row);

src/plugins/qmlprofiler/timelinemodelaggregator.h

@@ -61,6 +61,7 @@ public:
 
     Q_INVOKABLE bool isEmpty() const;
 
+    Q_INVOKABLE int modelOffset(int modelIndex) const;
     Q_INVOKABLE int rowHeight(int modelIndex, int row) const;
     Q_INVOKABLE void setRowHeight(int modelIndex, int row, int height);
     Q_INVOKABLE int rowOffset(int modelIndex, int row) const;