添加单个选择和上下文相关右键单击Zest Graph

Question

我一直在玩Zest GraphViewer超过一个星期,现在试图发现它可以为我的应用程序做些什么,但到目前为止我还没有能够满足我的要求.

我希望有人可以指出我需要的资源,因为我无法找到与Google一起使用的所有资源,或者可以告诉我我的想法是否可行.

版

我已经在RCP项目的依赖项中获得了Zest核心1.3.0和Zest布局1.1.0.这来自我从Zest网站上下载的网站.

要求

• 单节点/边缘选择.
• 选择空白时取消选择节点/边缘(这可能是一个错误？)
• 右键单击功能可在节点上进行更改.(当鼠标在节点上时检测)

右键单击功能可以来自单一选择,因为我可以在任何地方使用弹出窗口,但是它基于当前所选节点,但我宁愿不这样做.

由于性质或我们的应用程序和用户,我无法做到这一点,我可能还需要找到另一个具有此功能的基于RCP/SWT的Graph绘图包.

任何这些问题的任何帮助将不胜感激.

格伦x

Answer 1

根据Vogella的Zest教程,我想出了这个:

public static void main(String[] args) throws FontFormatException, IOException
{
    Display display = new Display();
    final Shell shell = new Shell(display);
    shell.setLayout(new FillLayout());

    final Graph graph = new Graph(shell, SWT.NONE);
    GraphNode node1 = new GraphNode(graph, SWT.NONE, "Jim");
    GraphNode node2 = new GraphNode(graph, SWT.NONE, "Jack");
    GraphNode node3 = new GraphNode(graph, SWT.NONE, "Joe");
    GraphNode node4 = new GraphNode(graph, SWT.NONE, "Bill");

    /* Context menu */
    graph.addMenuDetectListener(new MenuDetectListener()
    {
        @Override
        public void menuDetected(MenuDetectEvent e)
        {
            Point point = graph.toControl(e.x, e.y);
            IFigure fig = graph.getFigureAt(point.x, point.y);

            if (fig != null)
            {
                Menu menu = new Menu(shell, SWT.POP_UP);
                MenuItem exit = new MenuItem(menu, SWT.NONE);
                exit.setText("Hello! This is " + ((GraphLabel) fig).getText());
                menu.setVisible(true);
            }
            else
            {
                Menu menu = new Menu(shell, SWT.POP_UP);
                MenuItem exit = new MenuItem(menu, SWT.NONE);
                exit.setText("Nothing here...");
                menu.setVisible(true);
            }
        }
    });
    /* Lets have a directed connection */
    new GraphConnection(graph, ZestStyles.CONNECTIONS_DIRECTED, node1, node2);
    /* Lets have a dotted graph connection */
    new GraphConnection(graph, ZestStyles.CONNECTIONS_DOT, node2, node3);
    /* Standard connection */
    new GraphConnection(graph, SWT.NONE, node3, node1);
    /* Change line color and line width */
    GraphConnection graphConnection = new GraphConnection(graph, SWT.NONE, node1, node4);
    graphConnection.changeLineColor(shell.getDisplay().getSystemColor(SWT.COLOR_GREEN));
    /* Also set a text */
    graphConnection.setText("This is a text");
    graphConnection.setHighlightColor(shell.getDisplay().getSystemColor(SWT.COLOR_RED));
    graphConnection.setLineWidth(3);

    graph.setLayoutAlgorithm(new SpringLayoutAlgorithm(LayoutStyles.NO_LAYOUT_NODE_RESIZING), true);
    graph.addSelectionListener(new SelectionAdapter()
    {
        @Override
        public void widgetSelected(SelectionEvent e)
        {
            System.out.println(e.item);
            /* Make sure that only the newest item is selected */
            graph.setSelection(new GraphItem[]{(GraphItem)e.item});
        }

    });

    shell.pack();
    shell.open();
    shell.setSize(400, 300);

    while (!shell.isDisposed())
    {
        if (!display.readAndDispatch())
            display.sleep();
    }
    display.dispose();
}

它支持单节点/边缘选择,取消选择和右键单击功能.

看起来像这样:

如果您使用本GraphViewer教程的示例并将其添加到View代码中,它仍然可以正常工作:

final Graph graph = viewer.getGraphControl();
graph.addSelectionListener(new SelectionAdapter()
{
    @Override
    public void widgetSelected(SelectionEvent e)
    {
        System.out.println(e.item);
        graph.setSelection(new GraphItem[]{(GraphItem)e.item});
    }

});