Added Qt Elastic Example into NetworkView code.

works quite well!



git-svn-id: http://svn.code.sf.net/p/retroshare/code/trunk@392 b45a01b8-16f6-495d-af2f-9b41ad6348cc

retroshare-gui/src/gui/elastic/graphwidget.h

@@ -0,0 +1,76 @@
+/****************************************************************************
+**
+** Copyright (C) 2006-2007 Trolltech ASA. All rights reserved.
+**
+** This file is part of the example classes of the Qt Toolkit.
+**
+** This file may be used under the terms of the GNU General Public
+** License version 2.0 as published by the Free Software Foundation
+** and appearing in the file LICENSE.GPL included in the packaging of
+** this file.  Please review the following information to ensure GNU
+** General Public Licensing requirements will be met:
+** http://trolltech.com/products/qt/licenses/licensing/opensource/
+**
+** If you are unsure which license is appropriate for your use, please
+** review the following information:
+** http://trolltech.com/products/qt/licenses/licensing/licensingoverview
+** or contact the sales department at sales@trolltech.com.
+**
+** In addition, as a special exception, Trolltech gives you certain
+** additional rights. These rights are described in the Trolltech GPL
+** Exception version 1.0, which can be found at
+** http://www.trolltech.com/products/qt/gplexception/ and in the file
+** GPL_EXCEPTION.txt in this package.
+**
+** In addition, as a special exception, Trolltech, as the sole copyright
+** holder for Qt Designer, grants users of the Qt/Eclipse Integration
+** plug-in the right for the Qt/Eclipse Integration to link to
+** functionality provided by Qt Designer and its related libraries.
+**
+** Trolltech reserves all rights not expressly granted herein.
+**
+** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
+** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
+**
+****************************************************************************/
+
+#ifndef GRAPHWIDGET_H
+#define GRAPHWIDGET_H
+
+#include <QtGui/QGraphicsView>
+#include <string>
+#include <map>
+
+class Node;
+class Edge;
+
+class GraphWidget : public QGraphicsView
+{
+    Q_OBJECT
+
+public:
+    GraphWidget(QWidget *parent);
+
+    void itemMoved();
+
+    bool clearGraph();
+    void addNode(uint32_t type, std::string id, std::string name);
+    void addEdge(std::string id1, std::string id2);
+
+protected:
+    void keyPressEvent(QKeyEvent *event);
+    void timerEvent(QTimerEvent *event);
+    void wheelEvent(QWheelEvent *event);
+    void drawBackground(QPainter *painter, const QRectF &rect);
+
+    void scaleView(qreal scaleFactor);
+
+private:
+    int timerId;
+    Node *centerNode;
+
+    std::map<std::string, Node *> nodeMap;
+    std::list<Edge *> edgeList;
+};
+
+#endif