Clear node graph data on project change

Change-Id: Ic778e4e8eef3b29e2025d786f2b9e7658a7b2dec
Reviewed-by: spyro-adb <adb@spyro-soft.com>

share/qtcreator/qmldesigner/nodegrapheditor/Main.qml

@@ -159,6 +159,10 @@ Item {
             initEdges(edges);
             NodeGraphEditorBackend.nodeGraphEditorModel.hasUnsavedChanges = false;
         }
+        onNodeGraphCleared: {
+        graphView.graph.clearGraph();
+        NodeGraphEditorBackend.nodeGraphEditorModel.hasUnsavedChanges = false;
+        }
     }
 
     SaveAsDialog {

src/plugins/qmldesigner/components/nodegrapheditor/nodegrapheditormodel.cpp

@@ -61,13 +61,13 @@ void NodeGraphEditorModel::saveFile(QString fileName){
 
 void NodeGraphEditorModel::openFile(QString filePath){
     const QString nodeGraphName = QFileInfo(filePath).baseName();
-    setCurrentFileName(nodeGraphName);
     QFile nodeGraphFile(filePath);
     if (!nodeGraphFile.open(QIODevice::ReadOnly)) {
         QString error = QString("Couldn't open node graph file: '%1'").arg(filePath);
         qWarning() << qPrintable(error);
         return;
     }
+    setCurrentFileName(nodeGraphName);
      QByteArray data = nodeGraphFile.readAll();
         m_graphData = QString::fromStdString(data.toStdString());
         graphDataChanged();
@@ -77,6 +77,14 @@ void NodeGraphEditorModel::openFile(QString filePath){
     if (data.isEmpty())
         return;
 }
+
+void NodeGraphEditorModel::clear()
+{
+    setGraphData("");
+    setCurrentFileName("");
+    m_saveDirectory = "";
+    nodeGraphCleared();
+}
 QString NodeGraphEditorModel::saveDirectory(){
     if (m_saveDirectory!="") {
         return m_saveDirectory;

src/plugins/qmldesigner/components/nodegrapheditor/nodegrapheditormodel.h

@@ -24,6 +24,7 @@ public:
     Q_INVOKABLE void openFileName(QString filePath);
     Q_INVOKABLE void saveFile(QString fileName);
     Q_INVOKABLE void createQmlComponent(qan::Graph* graph);
+    void clear();
 private:
     QPointer<NodeGraphEditorView> m_editorView;
 
@@ -34,6 +35,7 @@ Q_PROPERTY(bool hasUnsavedChanges MEMBER m_hasUnsavedChanges WRITE setHasUnsaved
  signals:
 void graphDataChanged();
 void nodeGraphLoaded();
+void nodeGraphCleared();
     void hasUnsavedChangesChanged();
     void currentFileNameChanged();
     public:

src/plugins/qmldesigner/components/nodegrapheditor/nodegrapheditorview.cpp

@@ -4,7 +4,7 @@
 #include "nodegrapheditorview.h"
 #include "nodegrapheditormodel.h"
 #include "nodegrapheditorwidget.h"
-
+#include <qmldesignerplugin.h>
 namespace QmlDesigner {
 
 NodeGraphEditorView::NodeGraphEditorView(ExternalDependenciesInterface &externalDependencies)
@@ -19,6 +19,19 @@ NodeGraphEditorView::~NodeGraphEditorView()
     delete m_editorWidget.data();
 }
 
+
+void NodeGraphEditorView::modelAttached(QmlDesigner::Model *model)
+{
+    AbstractView::modelAttached(model);
+    QString currProjectPath = QmlDesignerPlugin::instance()->documentManager().currentProjectDirPath().toString();
+    if (m_currProjectPath != currProjectPath) { // starting a new project
+        m_editorModel->clear();
+    }
+
+    m_currProjectPath = currProjectPath;
+}
+
+
 WidgetInfo NodeGraphEditorView::widgetInfo()
 {
     if (!m_editorWidget)

src/plugins/qmldesigner/components/nodegrapheditor/nodegrapheditorview.h

@@ -19,13 +19,14 @@ public:
 
     bool hasWidget() const override { return true; }
     WidgetInfo widgetInfo() override;
+    void modelAttached(QmlDesigner::Model * model) override;
 
 private:
   void customNotification(const AbstractView *view, const QString &identifier,
                             const QList<QmlDesigner::ModelNode> &nodeList, const QList<QVariant> &data) override;
     QPointer<NodeGraphEditorModel> m_editorModel;
     QPointer<NodeGraphEditorWidget> m_editorWidget;
-    
+    QString m_currProjectPath;
 };
 
 } // namespace QmlDesigner