node can be set active with mouseRelease, button 'f' show/hides nodenumbers

edge.h

@@ -8,6 +8,7 @@ class Node;
 class Edge : public QGraphicsItem
 {
 public:
+
     Edge(Node *sourceNode, Node *destNode);
 
     Node *sourceNode() const;
@@ -15,20 +16,20 @@ public:
 
     void adjust();
 
-//    enum { Type = UserType + 2 };
-//    int type() const { return Type; }
-
 protected:
+
     QRectF boundingRect() const;
     void paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget);
 
 private:
+
     Node *m_sourceNode;
     Node *m_destNode;
 
     QPointF m_sourcePoint;
     QPointF m_destPoint;
     qreal m_arrowSize;
+
 };
 
 #endif

graphwidget.cpp

@@ -7,7 +7,9 @@
 #include "math.h"
 
 GraphWidget::GraphWidget(QWidget *parent) :
-    QGraphicsView(parent)
+    QGraphicsView(parent),
+    m_activeNode(0),
+    m_showingNodeNumbers(false)
 {
     qDebug() << __PRETTY_FUNCTION__;
 
@@ -21,35 +23,41 @@ GraphWidget::GraphWidget(QWidget *parent) :
     setTransformationAnchor(AnchorUnderMouse);
     setMinimumSize(400, 400);
 
-    Node *node1 = new Node();
+    Node *node1 = new Node(this);
     node1->setHtml(QString("me"));
     m_scene->addItem(node1);
     node1->setPos(-10, -10);
+    m_nodeList.append(node1);
 
-    Node *node2 = new Node();
+    Node *node2 = new Node(this);
     node2->setHtml(QString("work"));
     m_scene->addItem(node2);
     node2->setPos(60, -10);
+    m_nodeList.append(node2);
 
-    Node *node3 = new Node();
+    Node *node3 = new Node(this);
     node3->setHtml(QString("read"));
     m_scene->addItem(node3);
     node3->setPos(-70, -10);
+    m_nodeList.append(node3);
 
-    Node *node4 = new Node();
+    Node *node4 = new Node(this);
     node4->setHtml(QString("pragmatic programmer"));
     m_scene->addItem(node4);
     node4->setPos(-120, -80);
+    m_nodeList.append(node4);
 
-    Node *node5 = new Node();
+    Node *node5 = new Node(this);
     node5->setHtml(QString("joy"));
     m_scene->addItem(node5);
     node5->setPos(-10, 50);
+    m_nodeList.append(node5);
 
-    Node *node6 = new Node();
+    Node *node6 = new Node(this);
     node6->setHtml(QString("rape goats"));
     m_scene->addItem(node6);
     node6->setPos(-10, 100);
+    m_nodeList.append(node6);
 
     m_scene->addItem(new Edge(node1, node2));
     m_scene->addItem(new Edge(node1, node3));
@@ -57,9 +65,8 @@ GraphWidget::GraphWidget(QWidget *parent) :
     m_scene->addItem(new Edge(node1, node5));
     m_scene->addItem(new Edge(node5, node6));
 
-    m_activeNode = node1;
+    m_activeNode = m_nodeList.first();
-    m_activeNode->setFocus();
+    m_activeNode->setActive(true);
-
 }
 
 QGraphicsScene *GraphWidget::getScene()
@@ -69,32 +76,54 @@ QGraphicsScene *GraphWidget::getScene()
 
 void GraphWidget::keyPressEvent(QKeyEvent *event)
  {
+    qDebug() << __PRETTY_FUNCTION__;
+//    qDebug() << event->key();
+
      switch (event->key()) {
-//     case Qt::Key_Up:
+     case Qt::Key_Up:
-//         centerNode->moveBy(0, -20);
+         m_activeNode->moveBy(0, -20);
-//         break;
+         break;
-//     case Qt::Key_Down:
+     case Qt::Key_Down:
-//         centerNode->moveBy(0, 20);
+         m_activeNode->moveBy(0, 20);
-//         break;
+         break;
-//     case Qt::Key_Left:
+     case Qt::Key_Left:
-//         centerNode->moveBy(-20, 0);
+         m_activeNode->moveBy(-20, 0);
-//         break;
+         break;
-//     case Qt::Key_Right:
+     case Qt::Key_Right:
-//         centerNode->moveBy(20, 0);
+         m_activeNode->moveBy(20, 0);
-//         break;
+         break;
      case Qt::Key_Plus:
          scaleView(qreal(1.2));
          break;
      case Qt::Key_Minus:
          scaleView(1 / qreal(1.2));
          break;
-//     case Qt::Key_Space:
+     case Qt::Key_F:
-//     case Qt::Key_Enter:
+        { // need brackets because of local variable
-//         foreach (QGraphicsItem *item, scene()->items()) {
+         m_showingNodeNumbers = !m_showingNodeNumbers;
-//             if (qgraphicsitem_cast<Node *>(item))
+         int i =0;
-//                 item->setPos(-150 + qrand() % 300, -150 + qrand() % 300);
+         for (QList<Node *>::const_iterator it = m_nodeList.begin(); it != m_nodeList.end(); it++, i++)
-//         }
+             dynamic_cast<Node*>(*it)->showNumber(i,m_showingNodeNumbers);
-//         break;
+        }
+         break;
+
+     case Qt::Key_0:
+     case Qt::Key_1:
+     case Qt::Key_2:
+     case Qt::Key_3:
+     case Qt::Key_4:
+     case Qt::Key_5:
+     case Qt::Key_6:
+     case Qt::Key_7:
+     case Qt::Key_8:
+     case Qt::Key_9:
+
+         m_activeNode->setActive(false);
+         m_activeNode = m_nodeList[3];
+         m_activeNode->setActive(true);
+
+         break;
+
      default:
          QGraphicsView::keyPressEvent(event);
      }
@@ -109,14 +138,7 @@ void GraphWidget::drawBackground(QPainter *painter, const QRectF &rect)
  {
      Q_UNUSED(rect);
 
-     // Shadow
      QRectF sceneRect = this->sceneRect();
-//     QRectF rightShadow(sceneRect.right(), sceneRect.top() + 5, 5, sceneRect.height());
-//     QRectF bottomShadow(sceneRect.left() + 5, sceneRect.bottom(), sceneRect.width(), 5);
-//     if (rightShadow.intersects(rect) || rightShadow.contains(rect))
-//         painter->fillRect(rightShadow, Qt::darkGray);
-//     if (bottomShadow.intersects(rect) || bottomShadow.contains(rect))
-//         painter->fillRect(bottomShadow, Qt::darkGray);
 
      // Fill
      QLinearGradient gradient(sceneRect.topLeft(), sceneRect.bottomRight());
@@ -125,21 +147,6 @@ void GraphWidget::drawBackground(QPainter *painter, const QRectF &rect)
      painter->fillRect(rect.intersect(sceneRect), gradient);
      painter->setBrush(Qt::NoBrush);
      painter->drawRect(sceneRect);
-
-//     // Text
-//     QRectF textRect(sceneRect.left() + 4, sceneRect.top() + 4,
-//                     sceneRect.width() - 4, sceneRect.height() - 4);
-//     QString message(tr("Click and drag the nodes around, and zoom with the mouse "
-//                        "wheel or the '+' and '-' keys"));
-
-//     QFont font = painter->font();
-//     font.setBold(true);
-//     font.setPointSize(14);
-//     painter->setFont(font);
-//     painter->setPen(Qt::lightGray);
-//     painter->drawText(textRect.translated(2, 2), message);
-//     painter->setPen(Qt::black);
-//     painter->drawText(textRect, message);
  }
 
 
@@ -150,3 +157,15 @@ void GraphWidget::scaleView(qreal scaleFactor)
 
     scale(scaleFactor, scaleFactor);
 }
+
+/// @note this == 0? how is it possible?
+void GraphWidget::setActiveNode(Node *node)
+{
+    qDebug() << __PRETTY_FUNCTION__;
+
+    if (m_activeNode!=0)
+        m_activeNode->setActive(false);
+
+    m_activeNode = node;
+    m_activeNode->setActive(true);
+}

graphwidget.h

@@ -16,16 +16,23 @@ class GraphWidget : public QGraphicsView
 public:
     GraphWidget(QWidget *parent = 0);
     QGraphicsScene *getScene();
+    void setActiveNode(Node *node);
 
 protected:
+
     void keyPressEvent(QKeyEvent *event);
     void wheelEvent(QWheelEvent *event);
     void scaleView(qreal scaleFactor);
     void drawBackground(QPainter *painter, const QRectF &rect);
 
+
 private:
+
+    QList<Node *> m_nodeList;
     Node *m_activeNode;
     QGraphicsScene *m_scene;
+    bool m_showingNodeNumbers;
+
 
 };
 

mainwindow.cpp

@@ -89,6 +89,7 @@ void MainWindow::exportScene()
                     m_graphicsView->getScene()->sceneRect().height(),
                     QImage::Format_ARGB32_Premultiplied);
          QPainter painter(&img);
+
          painter.setRenderHint(QPainter::Antialiasing);
 
          /// @bug scene background is not rendered
@@ -110,7 +111,6 @@ void MainWindow::about()
     if (m_aboutDialog == 0) m_aboutDialog = new AboutDialog(this);
     m_aboutDialog->setEnabled(true); // children inherits enabled status
     m_aboutDialog->show();
-//    aboutDialog->layout()->setSizeConstraint( QLayout::SetFixedSize );
 }
 
 void MainWindow::aboutDestroyed()

node.cpp

@@ -5,7 +5,11 @@
 #include <QDebug>
 #include <QGraphicsSceneMouseEvent>
 
-Node::Node(GraphWidget *parent) : m_graph(parent)
+Node::Node(GraphWidget *parent) :
+    m_graph(parent),
+    m_isActive(false),
+    m_activeEdge(0),
+    m_number(-1)
 {
     qDebug() << __PRETTY_FUNCTION__;
 
@@ -38,7 +42,8 @@ QVariant Node::itemChange(GraphicsItemChange change, const QVariant &value)
 
     case ItemPositionChange:
 
-        if (change == ItemPositionChange && scene()) {
+        if (change == ItemPositionChange && scene())
+        {
             // value is the new position.
             QPointF newPos = value.toPointF();
             QRectF rect (scene()->sceneRect().topLeft(),
@@ -71,8 +76,59 @@ void Node::paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWid
 
     QGraphicsTextItem::paint(painter, option, w);
 
-        painter->setPen(QPen(Qt::blue));
+    painter->setPen(m_isActive ? Qt::red : Qt::blue);
+
     painter->drawRect(QRect(boundingRect().topLeft().toPoint(),
                             boundingRect().bottomRight().toPoint() -
                             QPoint(1,1)));
+
+    qDebug() << m_number;
+
+    if (m_number != -1)
+    {
+        painter->setPen(Qt::yellow);
+        painter->setBackground(Qt::black);
+        painter->setBackgroundMode(Qt::OpaqueMode);
+        painter->drawText(boundingRect().topLeft()+QPointF(0,11), QString("%1").arg(m_number));
+    }
+}
+
+void Node::setActive(const bool &active)
+{
+    qDebug() << __PRETTY_FUNCTION__;
+
+    m_isActive = active;
+    update();
+}
+
+
+void Node::mousePressEvent(QGraphicsSceneMouseEvent *event)
+{
+    qDebug() << __PRETTY_FUNCTION__;
+
+    QGraphicsItem::mousePressEvent(event);
+}
+
+void Node::mouseReleaseEvent(QGraphicsSceneMouseEvent *event)
+{
+    qDebug() << __PRETTY_FUNCTION__;
+
+    m_graph->setActiveNode(this);
+
+    QGraphicsItem::mouseReleaseEvent(event);
+}
+
+void Node::mouseMoveEvent(QGraphicsSceneMouseEvent *event)
+{
+    qDebug() << __PRETTY_FUNCTION__;
+
+    QGraphicsItem::mouseMoveEvent(event);
+}
+
+void Node::showNumber(const int &number, const bool& show)
+{
+    qDebug() << __PRETTY_FUNCTION__;
+
+    m_number = show ? number : -1;
+    update();
 }

node.h

@@ -15,17 +15,26 @@ public:
     Node(GraphWidget *graphWidget = 0);
 
     void addEdge(Edge *edge);
-    QList<Edge *> edges() const;
+//    QList<Edge *> edges() const;
+    void setActive(const bool &active);
+    void showNumber(const int &number, const bool& show);
+
 
 protected:
 
-    QVariant itemChange(GraphicsItemChange change, const QVariant &value);
     void paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget);
+    QVariant itemChange(GraphicsItemChange change, const QVariant &value);
+    void mousePressEvent(QGraphicsSceneMouseEvent *event);
+    void mouseReleaseEvent(QGraphicsSceneMouseEvent *event);
+    void mouseMoveEvent(QGraphicsSceneMouseEvent *event);
 
 private:
 
     QList<Edge *> m_edgeList;
     GraphWidget *m_graph;
+    bool m_isActive;
+    Edge *m_activeEdge;
+    int m_number;
 };
 
 #endif // NODE_H