QmlDesigner: Close dialog if target is removed

If the target is removed also the connection is removed and
we close the dialog.

Change-Id: I361e89ef64484e39bc0068e103f542cbc9dcbf78
Reviewed-by: Qt CI Patch Build Bot <ci_patchbuild_bot@qt.io>
Reviewed-by: Aleksei German <aleksei.german@qt.io>

share/qtcreator/qmldesigner/connectionseditor/ConnectionsDialog.qml

@@ -7,7 +7,7 @@ import StudioTheme 1.0 as StudioTheme
 import HelperWidgets 2.0 as HelperWidgets
 
 PopupDialog {
-
+    id: root
    property alias backend: form.backend
 
     titleBar: Row {
@@ -41,5 +41,13 @@ PopupDialog {
 
     ConnectionsDialogForm {
           id: form
+
+          Connections {
+              target: root.backend
+              onPopupTargetRemoved: {
+                  root.close()
+              }
+          }
     }
+
 }

src/plugins/qmldesigner/components/connectioneditor/connectionmodel.cpp

@@ -487,6 +487,17 @@ void ConnectionModel::selectProperty(const SignalHandlerProperty &property)
     }
 }
 
+void ConnectionModel::nodeAboutToBeRemoved(const ModelNode &removedNode)
+{
+    SignalHandlerProperty selectedSignal = signalHandlerPropertyForRow(currentIndex());
+    if (selectedSignal.isValid()) {
+        ModelNode targetNode = getTargetNodeForConnection(selectedSignal.parentModelNode());
+        if (targetNode == removedNode) {
+            emit m_delegate->popupTargetRemoved();
+        }
+    }
+}
+
 void ConnectionModel::handleException()
 {
     QMessageBox::warning(nullptr, tr("Error"), m_exceptionError);

src/plugins/qmldesigner/components/connectioneditor/connectionmodel.h

@@ -71,6 +71,8 @@ public:
 
     void selectProperty(const SignalHandlerProperty &property);
 
+    void nodeAboutToBeRemoved(const ModelNode &removedNode);
+
 signals:
     void currentIndexChanged();
 
@@ -296,6 +298,7 @@ signals:
     void hasConditionChanged();
     void hasElseChanged();
     void sourceChanged();
+    void popupTargetRemoved();
 
 private:
     int currentRow() const;

src/plugins/qmldesigner/components/connectioneditor/connectionview.cpp

@@ -176,6 +176,11 @@ void ConnectionView::nodeCreated(const ModelNode & /*createdNode*/)
     connectionModel()->resetModel();
 }
 
+void ConnectionView::nodeAboutToBeRemoved(const ModelNode &removedNode)
+{
+    connectionModel()->nodeAboutToBeRemoved(removedNode);
+}
+
 void ConnectionView::nodeRemoved(const ModelNode & /*removedNode*/,
                                  const NodeAbstractProperty & /*parentProperty*/,
                                  AbstractView::PropertyChangeFlags /*propertyChange*/)

src/plugins/qmldesigner/components/connectioneditor/connectionview.h

@@ -39,6 +39,7 @@ public:
     void modelAboutToBeDetached(Model *model) override;
 
     void nodeCreated(const ModelNode &createdNode) override;
+    void nodeAboutToBeRemoved(const ModelNode &removedNode) override;
     void nodeRemoved(const ModelNode &removedNode, const NodeAbstractProperty &parentProperty, PropertyChangeFlags propertyChange) override;
     void nodeReparented(const ModelNode &node, const NodeAbstractProperty &newPropertyParent,
                         const NodeAbstractProperty &oldPropertyParent, AbstractView::PropertyChangeFlags propertyChange) override;