From 080c5aac6aa8e9425198e118b8294e250dff20b4 Mon Sep 17 00:00:00 2001
From: Denes Matetelki <denes.matetelki@gmail.com>
Date: Thu, 9 Jun 2011 14:55:16 +0200
Subject: [PATCH] active node can be deleted with DEL. Code is getting messy,
 time to some refactor

---
 edge.cpp        |  6 ++++++
 edge.h          |  1 +
 graphwidget.cpp | 55 ++++++++++++++++++++++++++++++++++++++++++-------
 node.cpp        | 12 +++++++++++
 node.h          |  2 ++
 5 files changed, 68 insertions(+), 8 deletions(-)

diff --git a/edge.cpp b/edge.cpp
index 4b8535e..69ff306 100644
--- a/edge.cpp
+++ b/edge.cpp
@@ -22,6 +22,12 @@ Edge::Edge(Node *sourceNode, Node *destNode)
 //    setZValue(1);
 }
 
+Edge::~Edge()
+{
+    m_sourceNode->removeEdge(this);
+    m_destNode->removeEdge(this);
+}
+
 Node *Edge::sourceNode() const
 {
     return m_sourceNode;
diff --git a/edge.h b/edge.h
index 3d4c4b0..7e94c8f 100644
--- a/edge.h
+++ b/edge.h
@@ -10,6 +10,7 @@ class Edge : public QGraphicsItem
 public:
 
     Edge(Node *sourceNode, Node *destNode);
+    ~Edge();
 
     Node *sourceNode() const;
     Node *destNode() const;
diff --git a/graphwidget.cpp b/graphwidget.cpp
index 985f15e..ca3fdc3 100644
--- a/graphwidget.cpp
+++ b/graphwidget.cpp
@@ -8,7 +8,9 @@
 
 GraphWidget::GraphWidget(QWidget *parent) :
     QGraphicsView(parent),
-    m_showingNodeNumbers(false)
+    m_activeNode(0),
+    m_showingNodeNumbers(false),
+    m_followNode(0)
 {
     qDebug() << __PRETTY_FUNCTION__;
 
@@ -124,16 +126,20 @@ void GraphWidget::keyPressEvent(QKeyEvent *event)
 
      switch (event->key()) {
      case Qt::Key_Up:
-         m_activeNode->moveBy(0, -20);
+         if (m_activeNode)
+            m_activeNode->moveBy(0, -20);
          break;
      case Qt::Key_Down:
-         m_activeNode->moveBy(0, 20);
+         if (m_activeNode)
+            m_activeNode->moveBy(0, 20);
          break;
      case Qt::Key_Left:
-         m_activeNode->moveBy(-20, 0);
+         if (m_activeNode)
+            m_activeNode->moveBy(-20, 0);
          break;
      case Qt::Key_Right:
-         m_activeNode->moveBy(20, 0);
+         if (m_activeNode)
+            m_activeNode->moveBy(20, 0);
          break;
      case Qt::Key_Plus:
          scaleView(qreal(1.2));
@@ -147,6 +153,11 @@ void GraphWidget::keyPressEvent(QKeyEvent *event)
              m_followNumber.clear();
 
          showingAllNodeNumbers(m_showingNodeNumbers);
+         if (m_showingNodeNumbers)
+         {
+             m_nodeList.first()->showNumber(0,true,true);
+             m_followNode = m_nodeList.first();
+         }
          break;
 
      case Qt::Key_Insert:
@@ -182,6 +193,8 @@ void GraphWidget::keyPressEvent(QKeyEvent *event)
             if (m_followNumber.isEmpty())
             {
                 showingAllNodeNumbers(true);
+                m_nodeList.first()->showNumber(0,true,true);
+                m_followNode = m_nodeList.first();
             }
             else
             {
@@ -193,16 +206,40 @@ void GraphWidget::keyPressEvent(QKeyEvent *event)
 
      case Qt::Key_Return:
      case Qt::Key_Enter:
-         if (m_followNode)
+         if (m_followNode && m_showingNodeNumbers)
          {
+             qDebug() << m_activeNode;
+             qDebug() << m_followNode;
              showingAllNodeNumbers(false);
-             m_activeNode->setActive(false);
+             if (m_activeNode)
+                m_activeNode->setActive(false);
              m_activeNode = m_followNode;
              m_activeNode->setActive();
              m_showingNodeNumbers = false;
          }
          break;
 
+     case Qt::Key_Delete:
+
+         if (m_activeNode)
+         {
+             if (m_followNode==m_activeNode)
+                 m_followNode=0;
+
+             m_nodeList.removeAll(m_activeNode);
+             delete m_activeNode;
+             m_activeNode = 0;
+
+             /// @bug
+             if (m_showingNodeNumbers)
+             {
+                 m_showingNodeNumbers = false;
+                 showingAllNodeNumbers(false);
+             }
+         }
+
+         break;
+
      default:
          QGraphicsView::keyPressEvent(event);
      }
@@ -283,7 +320,9 @@ void GraphWidget::showingNodeNumbersBeginWithNumber(const int &number, const boo
     {
         qDebug() << "set active";
         showingAllNodeNumbers(false);
-        m_activeNode->setActive(false);
+        if (m_activeNode)
+            m_activeNode->setActive(false);
+
         m_activeNode = m_followNode;
         m_activeNode->setActive();
         m_showingNodeNumbers = false;
diff --git a/node.cpp b/node.cpp
index a121c27..3687acb 100644
--- a/node.cpp
+++ b/node.cpp
@@ -26,6 +26,12 @@ Node::Node(GraphWidget *parent) :
 //    setTextInteractionFlags(Qt::TextEditorInteraction);
 }
 
+Node::~Node()
+{
+    qDebug() << __PRETTY_FUNCTION__;
+    foreach (Edge *edge, m_edgeList) delete edge;
+}
+
 void Node::addEdge(Edge *edge)
 {
     qDebug() << __PRETTY_FUNCTION__;
@@ -34,6 +40,12 @@ void Node::addEdge(Edge *edge)
     edge->adjust();
 }
 
+void Node::removeEdge(Edge *edge)
+{
+    qDebug() << __PRETTY_FUNCTION__;
+
+    m_edgeList.removeAll(edge);
+}
 
 QVariant Node::itemChange(GraphicsItemChange change, const QVariant &value)
 {
diff --git a/node.h b/node.h
index 6068fad..a6270d1 100644
--- a/node.h
+++ b/node.h
@@ -13,8 +13,10 @@ class Node : public QGraphicsTextItem
 public:
 
     Node(GraphWidget *graphWidget = 0);
+    ~Node();
 
     void addEdge(Edge *edge);
+    void removeEdge(Edge *edge);
 //    QList<Edge *> edges() const;
     void setActive(const bool &active = true);
     void showNumber(const int &number, const bool& show = true, const bool &numberIsSpecial = false);