first commit of scaleUp/Down as an undo-able command

include/commands.h

@@ -23,6 +23,7 @@ struct UndoContext
     qreal m_x;
     qreal m_y;
     bool m_subtree;
+    qreal m_scale;
 
     UndoContext(GraphLogic *graphLogic = 0,
                 Node *activeNode = 0,
@@ -35,7 +36,8 @@ struct UndoContext
                 bool secondary = false,
                 qreal x = 0,
                 qreal y = 0,
-                bool subtree = false)
+                bool subtree = false,
+                qreal scale = 0)
         : m_graphLogic(graphLogic)
         , m_activeNode(activeNode)
         , m_hintNode(hintNode)
@@ -48,6 +50,7 @@ struct UndoContext
         , m_x(x)
         , m_y(y)
         , m_subtree(subtree)
+        , m_scale(scale)
     {};
 };
 
@@ -180,5 +183,20 @@ private:
     QMap<Node*, QColor> m_colorMap;
 };
 
+class ScaleNodeCommand : public BaseUndoClass
+{
+
+public:
+
+    ScaleNodeCommand(UndoContext context);
+
+    void undo();
+    void redo();
+
+private:
+
+    QMap<Node*, qreal> m_scaleMap;
+};
+
 
 #endif // COMMANDS_H

include/graphlogic.h

@@ -47,10 +47,10 @@ public slots:
     void insertNode();      // undo command
     void removeNode();      // undo command
     void nodeEdited();      /// @todo Rewrite as an undo action
-    void scaleUp();     /// @todo Rewrite as an undo action
+    void scaleUp();         // undo command
-    void scaleDown();   /// @todo Rewrite as an undo action
+    void scaleDown();       // undo command
     void nodeColor();       // undo command
-    void nodeTextColor();
+    void nodeTextColor();   // undo command
     void addEdge();
     void removeEdge();
     void hintMode();

src/commands.cpp

@@ -363,3 +363,32 @@ void NodeTextColorCommand::redo()
 
     m_context.m_graphLogic->setActiveNode(m_activeNode);
 }
+
+ScaleNodeCommand::ScaleNodeCommand(UndoContext context)
+    : BaseUndoClass(context)
+{
+    setText(QObject::tr("Changing scale of node: \"").append(
+                m_context.m_activeNode == m_context.m_nodeList->first() ?
+                    QObject::tr("Base node") :
+                    m_context.m_activeNode->toPlainText()).append("\"").
+                append(m_subtree ? QObject::tr(" with subtree") : QString("")));
+
+    foreach(Node *node, m_nodeList)
+        m_scaleMap[node] = node->scale();
+}
+
+void ScaleNodeCommand::undo()
+{
+    foreach(Node *node, m_nodeList)
+        node->setScale(m_scaleMap[node], m_context.m_graphLogic->graphWidget()->sceneRect());
+
+    m_context.m_graphLogic->setActiveNode(m_activeNode);
+}
+
+void ScaleNodeCommand::redo()
+{
+    foreach(Node *node, m_nodeList)
+        node->setScale(m_context.m_scale, m_context.m_graphLogic->graphWidget()->sceneRect());
+
+    m_context.m_graphLogic->setActiveNode(m_activeNode);
+}

src/graphlogic.cpp

@@ -416,17 +416,30 @@ void GraphLogic::scaleUp()
         return;
     }
 
-    if (QApplication::keyboardModifiers() & Qt::ControlModifier &&
+    bool subtree(QApplication::keyboardModifiers() & Qt::ControlModifier &&
-        QApplication::keyboardModifiers() & Qt::ShiftModifier)
+                 QApplication::keyboardModifiers() & Qt::ShiftModifier);
-    {
+
-        QList <Node *> nodeList = m_activeNode->subtree();
+    UndoContext context;
-        foreach(Node *node, nodeList)
+    context.m_graphLogic = this;
-            node->setScale(qreal(1.2), m_graphWidget->sceneRect());
+    context.m_nodeList = &m_nodeList;
-    }
+    context.m_activeNode = m_activeNode;
-    else
+    context.m_scale = qreal(1.2);
-    {
+    context.m_subtree = subtree;
-        m_activeNode->setScale(qreal(1.2),m_graphWidget->sceneRect());
+
-    }
+    QUndoCommand *scaleNodeCommand = new ScaleNodeCommand(context);
+    m_undoStack->push(scaleNodeCommand);
+
+//    if (QApplication::keyboardModifiers() & Qt::ControlModifier &&
+//        QApplication::keyboardModifiers() & Qt::ShiftModifier)
+//    {
+//        QList <Node *> nodeList = m_activeNode->subtree();
+//        foreach(Node *node, nodeList)
+//            node->setScale(qreal(1.2), m_graphWidget->sceneRect());
+//    }
+//    else
+//    {
+//        m_activeNode->setScale(qreal(1.2),m_graphWidget->sceneRect());
+//    }
 }
 
 void GraphLogic::scaleDown()
@@ -437,17 +450,31 @@ void GraphLogic::scaleDown()
         return;
     }
 
-    if (QApplication::keyboardModifiers() & Qt::ControlModifier &&
+    bool subtree(QApplication::keyboardModifiers() & Qt::ControlModifier &&
-        QApplication::keyboardModifiers() & Qt::ShiftModifier)
+                 QApplication::keyboardModifiers() & Qt::ShiftModifier);
-    {
+
-        QList <Node *> nodeList = m_activeNode->subtree();
+    UndoContext context;
-        foreach(Node *node, nodeList)
+    context.m_graphLogic = this;
-            node->setScale(qreal(1 / 1.2),m_graphWidget->sceneRect());
+    context.m_nodeList = &m_nodeList;
-    }
+    context.m_activeNode = m_activeNode;
-    else
+    context.m_scale = qreal(1 / 1.2);
-    {
+    context.m_subtree = subtree;
-        m_activeNode->setScale(qreal(1 / 1.2),m_graphWidget->sceneRect());
+
-    }
+    QUndoCommand *scaleNodeCommand = new ScaleNodeCommand(context);
+    m_undoStack->push(scaleNodeCommand);
+
+
+//    if (QApplication::keyboardModifiers() & Qt::ControlModifier &&
+//        QApplication::keyboardModifiers() & Qt::ShiftModifier)
+//    {
+//        QList <Node *> nodeList = m_activeNode->subtree();
+//        foreach(Node *node, nodeList)
+//            node->setScale(qreal(1 / 1.2),m_graphWidget->sceneRect());
+//    }
+//    else
+//    {
+//        m_activeNode->setScale(qreal(1 / 1.2),m_graphWidget->sceneRect());
+//    }
 }
 
 void GraphLogic::nodeColor()

src/node.cpp

@@ -221,9 +221,9 @@ QColor Node::textColor() const
 void Node::setScale(const qreal &factor,const QRectF &sceneRect)
 {
     // limit scale to a reasonable size
-    if (factor * scale() < 0.4 ||
+//    if (factor * scale() < 0.4 ||
-        factor * scale() > 4 )
+//        factor * scale() > 4 )
-        return;
+//        return;
 
     // cannot scale out the Node from the scene
     if (!sceneRect.contains(pos() +