如何在MVC-gui中使用JUNG2？

Question

我當時在玩JUNG2，並想實現一個小的GUI，使我可以顯示和更改Graph。 遵循JUNG庫中的示例可以很好地工作，但是它們沒有將模型，視圖和控制器分開。 因此，我開始以清晰的分離來構建GUI。

我的第一個GUI版本應該只是顯示初始圖形。 視圖是模型的觀察者，只要圖形發生更改，該通知就會在圖形的初始化步驟中恰好發生一次，並獲得通知。 但是，該圖並沒有顯示在屏幕的中央（就像在非MVC示例中一樣），但是我可以在左上角看到它的一小部分。

現在，這引出了一個普遍的問題：我如何告訴jung可視化組件模型已更改？ 以及以后的內容：如何使用現成的組件，例如MVC體系結構中的Jung-Mouse？ JUNG似乎混合了模型，視圖和控制器，但我不確定如何以及在何處正確使用它們。

編輯： Jung教程顯示了如何使用鼠標來管理更改，但未顯示如何根據模型中的更改來更改視圖（通過其他選項，例如按鈕“添加節點”或其他）

到目前為止，這是我的第一次嘗試：

風景

public class MOCView implements GraphChangeObserver {

private final ControllerInterface controller;
private final MOCModelInterface model;
private Layout<Node, Edge> layout;
private BasicVisualizationServer<Node, Edge> visualization;
private JFrame frame;

public MOCView(final ControllerInterface controller,
        final MOCModelInterface model) {
    this.controller = controller;
    this.model = model;
    model.registerObserver(this);
}

public void createView() {
    this.layout = new CircleLayout<Node, Edge>(this.model.getGraph());
    this.layout.setSize(new Dimension(300, 300));
    this.visualization = new BasicVisualizationServer<Node, Edge>(
            this.layout);
    this.visualization.setPreferredSize(new Dimension(350, 350));

    this.frame = new JFrame("MOC View");
    this.frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    this.frame.getContentPane().add(this.visualization);
    this.frame.pack();
    this.frame.setVisible(true);
}

@Override
public void updateGraph() {
    this.visualization.repaint();
}
}

該模型

public class MOCModel implements MOCModelInterface {

private final Graph<Node, Edge> graph = new DirectedSparseGraph<Node, Edge>();
private final ArrayList<GraphChangeObserver> graphChangeObservers = new ArrayList<GraphChangeObserver>();

@Override
public void initialize() {
    this.generateInitialGraph();
}

@Override
public Graph<Node, Edge> getGraph() {
    return this.graph;
}

@Override
public void registerObserver(final GraphChangeObserver o) {
    this.graphChangeObservers.add(o);
}

@Override
public void removeObserver(final GraphChangeObserver o) {
    this.graphChangeObservers.remove(o);
}

private void generateInitialGraph() {
    final Node nodeA = new Node("Node A");
    this.graph.addVertex(nodeA);
    final Node nodeB = new Node("Node B");
    this.graph.addVertex(nodeB);
    final Node nodeC = new Node("Node C");
    this.graph.addVertex(nodeC);
    final Node nodeD = new Node("Node D");
    this.graph.addVertex(nodeD);
    final Node nodeE = new Node("Node E");
    this.graph.addVertex(nodeE);
    this.graph.addEdge(new Edge("Edge 1"), nodeA, nodeB);
    this.graph.addEdge(new Edge("Edge 2"), nodeA, nodeC);
    this.graph.addEdge(new Edge("Edge 3"), nodeB, nodeC);
    this.graph.addEdge(new Edge("Edge 4"), nodeC, nodeD);
    this.graph.addEdge(new Edge("Edge 5"), nodeD, nodeE);
    this.graph.addEdge(new Edge("Edge 6"), nodeA, nodeE);
    this.graph.addEdge(new Edge("Edge 7"), nodeE, nodeA);
    this.graph.addEdge(new Edge("Edge 8"), nodeD, nodeB);
    notifyGraphChangeObservers();
}

private void notifyGraphChangeObservers() {
    for (final GraphChangeObserver gco : this.graphChangeObservers) {
        gco.updateGraph();
    }
}
}

控制器

public class MOCController implements ControllerInterface {

private final MOCModelInterface model;
private final MOCView view;

public MOCController(final MOCModelInterface model) {
    this.model = model;
    this.view = new MOCView(this, model);
    this.view.createView();
    this.model.initialize();
}
}

主班

public class MOCStart {

/**
 * @param args
 */
public static void main(final String[] args) {
    final MOCModelInterface model = new MOCModel();
    new MOCController(model);
}

}

Answer 1

了解JUNG2工作原理的最佳方法是使用Maven svn checkout http://jung.googlecode.com/svn/trunk/ jung-read-only通過m2e Maven Eclipse插件從SVN存儲庫中查看其樣本， svn checkout http://jung.googlecode.com/svn/trunk/ jung-read-only //jung.googlecode.com/svn/trunk/ svn checkout http://jung.googlecode.com/svn/trunk/ jung-read-only

從此處，檢查edu.uci.ics.jung.samples包， 以獲取涉及圖形鼠標的各種JUNG2代碼示例：例如GraphEditorDemo.java

注意 ：請應用以下SVN補丁來更正一些錯誤

### Eclipse Workspace Patch 1.0
#P jung-io
Index: src/test/java/edu/uci/ics/jung/io/TestGraphMLReader.java
===================================================================
--- src/test/java/edu/uci/ics/jung/io/TestGraphMLReader.java    (revision 31)
+++ src/test/java/edu/uci/ics/jung/io/TestGraphMLReader.java    (working copy)
@@ -125,7 +125,7 @@
     public void testAttributes() throws IOException
     {
         Graph<Number, Number> graph = new UndirectedSparseGraph<Number, Number>();
-        gmlreader.load("src/test/resources/attributes.graphml", graph);
+        gmlreader.load("src/test/resources/edu/uci/ics/jung/io/graphml/attributes.graphml", graph);

         Assert.assertEquals(graph.getVertexCount(), 6);
         Assert.assertEquals(graph.getEdgeCount(), 7);
@@ -193,7 +193,7 @@
         GraphMLReader<Hypergraph<Number, Number>, Number, Number> hyperreader = 
             new GraphMLReader<Hypergraph<Number, Number>, Number, Number>(
                 vertexFactory, edgeFactory);
-        hyperreader.load("src/test/resources/hyper.graphml", graph);
+        hyperreader.load("src/test/resources/edu/uci/ics/jung/io/graphml/hyper.graphml", graph);

         Assert.assertEquals(graph.getVertexCount(), 7);
         Assert.assertEquals(graph.getEdgeCount(), 4);

### Eclipse Workspace Patch 1.0
#P jung2
Index: jung-visualization/src/main/java/edu/uci/ics/jung/visualization/control/EditingPopupGraphMousePlugin.java
===================================================================
--- jung-visualization/src/main/java/edu/uci/ics/jung/visualization/control/EditingPopupGraphMousePlugin.java   (revision 31)
+++ jung-visualization/src/main/java/edu/uci/ics/jung/visualization/control/EditingPopupGraphMousePlugin.java   (working copy)
@@ -54,6 +54,8 @@
             final PickedState<V> pickedVertexState = vv.getPickedVertexState();
             final PickedState<E> pickedEdgeState = vv.getPickedEdgeState();

+            popup.removeAll();
+            
             if(vertex != null) {
                Set<V> picked = pickedVertexState.getPicked();
                if(picked.size() > 0) {