Keep tree view scroll position when model is reset

Change-Id: Idf2adb94a1d80edba022545d7d1637c0c4cdd6e5
Reviewed-by: Tomi Korpipää <tomi.korpipaa@qt.io>
Reviewed-by: Titta Heikkala <titta.heikkala@qt.io>

3 files changed, 10 insertions, 0 deletions

diff --git a/editorlib/qml/EntityTree.qml b/editorlib/qml/EntityTree.qml
index b220bad..8a8549e 100644
--- a/editorlib/qml/EntityTree.qml
+++ b/editorlib/qml/EntityTree.qml
@@ -182,6 +182,7 @@ Item {
         property bool sceneRootSelected: true
         property bool cameraSelected: true
         property bool groupSelected: true
+        property real preResetContentY: 0
 
         onExpanded: {
             model.addExpandedItem(index)
@@ -200,6 +201,12 @@ Item {
                 entityTreeView.selection.setCurrentIndex(selectIndex,
                                                          ItemSelectionModel.SelectCurrent)
             }
+            onModelAboutToBeReset: {
+                entityTreeView.preResetContentY = entityTreeView.flickableItem.contentY
+            }
+            onResetComplete: {
+                entityTreeView.flickableItem.contentY = entityTreeView.preResetContentY
+            }
         }
 
         itemDelegate: FocusScope {
diff --git a/editorlib/src/editorsceneitemmodel.cpp b/editorlib/src/editorsceneitemmodel.cpp
index c8c2346..ae5a2da 100644
--- a/editorlib/src/editorsceneitemmodel.cpp
+++ b/editorlib/src/editorsceneitemmodel.cpp
@@ -277,6 +277,8 @@ void EditorSceneItemModel::resetModel()
     // Select scene root after reset, unless multiselecting
     if (!m_scene->multiSelection())
         emit selectIndex(sceneEntityIndex());
+
+    emit resetComplete();
 }
 
 EditorSceneItem *EditorSceneItemModel::editorSceneItemFromIndex(const QModelIndex &index) const
diff --git a/editorlib/src/editorsceneitemmodel.h b/editorlib/src/editorsceneitemmodel.h
index eee5c68..aef98e9 100644
--- a/editorlib/src/editorsceneitemmodel.h
+++ b/editorlib/src/editorsceneitemmodel.h
@@ -105,6 +105,7 @@ signals:
     void expandItems(const QModelIndexList &items);
     void selectIndex(const QModelIndex &selectIndex);
     void importEntityInProgressChanged(bool importInProgress);
+    void resetComplete();
 
 private slots:
     void handleEntityNameChange();