QmlDesigner: Add Singleton support to Connections

Change-Id: I07eae4e381f172d7c6a23ee5b7e13273afa788b9
Reviewed-by: Thomas Hartmann <thomas.hartmann@qt.io>

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

@@ -34,6 +34,8 @@
 #include <exception.h>
 #include <nodemetainfo.h>
 #include <nodelistproperty.h>
+#include <rewriterview.h>
+#include <nodemetainfo.h>
 
 #include <QStandardItemModel>
 #include <QMessageBox>
@@ -209,10 +211,27 @@ void ConnectionModel::updateTargetNode(int rowNumber)
     ModelNode connectionNode = signalHandlerProperty.parentModelNode();
 
     const bool isAlias = newTarget.contains(".");
+    bool isSingleton = false;
+
+    if (RewriterView* rv = connectionView()->rewriterView()) {
+        for (const QmlTypeData &data : rv->getQMLTypes()) {
+            if (!data.typeName.isEmpty()) {
+                if (data.typeName == newTarget) {
+                    if (connectionView()->model()->metaInfo(data.typeName.toUtf8()).isValid()) {
+                        isSingleton = true;
+                        break;
+                    }
+                }
+            }
+        }
+    }
 
     if (!newTarget.isEmpty()) {
-        //if it's an alias, then let's reparent connections to alias property owner:
-        const ModelNode parent = connectionView()->modelNodeForId(isAlias
+        //if it's a singleton, then let's reparent connections to rootNode,
+        //if it's an alias, then reparent to alias property owner:
+        const ModelNode parent = connectionView()->modelNodeForId(isSingleton
+                                                                  ? connectionView()->rootModelNode().id()
+                                                                  : isAlias
                                                                   ? newTarget.split(".").constFirst()
                                                                   : newTarget);
 
@@ -430,6 +449,28 @@ QStringList ConnectionModel::getPossibleSignalsForConnection(const ModelNode &co
     QStringList stringList;
 
     if (connection.isValid()) {
+
+        //separate check for singletons
+        if (connection.hasBindingProperty("target")) {
+            BindingProperty bp = connection.bindingProperty("target");
+
+            if (bp.isValid()) {
+                if (RewriterView *rv = connectionView()->rewriterView()) {
+                    for (const QmlTypeData &data : rv->getQMLTypes()) {
+                        if (!data.typeName.isEmpty()) {
+                            if (data.typeName == bp.expression()) {
+                                NodeMetaInfo metaInfo = connectionView()->model()->metaInfo(data.typeName.toUtf8());
+                                if (metaInfo.isValid()) {
+                                    stringList.append(propertyNameListToStringList(metaInfo.signalNames()));
+                                    return stringList;
+                                }
+                            }
+                        }
+                    }
+                }
+            }
+        }
+
         ModelNode targetNode = getTargetNodeForConnection(connection);
         if (targetNode.isValid() && targetNode.metaInfo().isValid()) {
             stringList.append(propertyNameListToStringList(targetNode.metaInfo().signalNames()));

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

@@ -30,6 +30,7 @@
 #include "bindingmodel.h"
 #include "dynamicpropertiesmodel.h"
 #include "connectionview.h"
+#include "nodemetainfo.h"
 
 #include <bindingproperty.h>
 
@@ -152,11 +153,13 @@ QWidget *BindingDelegate::createEditor(QWidget *parent, const QStyleOptionViewIt
             bindingComboBox->addItems(model->possibleTargetProperties(bindingProperty));
         } break;
         case BindingModel::SourceModelNodeRow: {
+            //common items
             for (const ModelNode &modelNode : model->connectionView()->allModelNodes()) {
                 if (!modelNode.id().isEmpty()) {
                     bindingComboBox->addItem(modelNode.id());
                 }
             }
+            //singletons:
             if (RewriterView* rv = model->connectionView()->rewriterView()) {
                 for (const QmlTypeData &data : rv->getQMLTypes()) {
                     if (!data.typeName.isEmpty()) {
@@ -164,6 +167,7 @@ QWidget *BindingDelegate::createEditor(QWidget *parent, const QStyleOptionViewIt
                     }
                 }
             }
+            //parent:
             if (!bindingProperty.parentModelNode().isRootNode())
                 bindingComboBox->addItem(QLatin1String("parent"));
         } break;
@@ -306,6 +310,26 @@ QWidget *ConnectionDelegate::createEditor(QWidget *parent, const QStyleOptionVie
                 }
             }
         }
+        //singletons:
+        if (RewriterView* rv = connectionModel->connectionView()->rewriterView()) {
+            for (const QmlTypeData &data : rv->getQMLTypes()) {
+                if (!data.typeName.isEmpty()) {
+                    connectionComboBox->addItem(data.typeName);
+
+                    NodeMetaInfo metaInfo = connectionModel->connectionView()->model()->metaInfo(data.typeName.toUtf8());
+
+                    if (metaInfo.isValid()) {
+                        for (const PropertyName &propertyName : metaInfo.propertyNames()) {
+                            if (metaInfo.propertyTypeName(propertyName) == "alias") {
+                                connectionComboBox->addItem(data.typeName
+                                                            + "."
+                                                            + QString::fromUtf8(propertyName));
+                            }
+                        }
+                    }
+                }
+            }
+        }
     } break;
     case ConnectionModel::TargetPropertyNameRow: {
         connectionComboBox->addItems(prependOnForSignalHandler(connectionModel->getSignalsForRow(index.row())));