getnodes.html

来自「java类库详细讲解」· HTML 代码 · 共 185 行

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<TITLE>Visiting All the Nodes in a JTree Component
(Java Developers Almanac Example)
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  <h3>
    e1022.  
    Visiting All the Nodes in a JTree Component</h3>



<pre>
    // Create tree
    JTree tree = new JTree();
    
    // Add the nodes...
    
    // Visit all nodes
    visitAllNodes(tree);
    
    // Visit only expanded nodes
    visitAllExpandedNodes(tree);
    
    // Traverse all nodes in tree
    public void visitAllNodes(JTree tree) {
        TreeNode root = (TreeNode)tree.getModel().getRoot();
        visitAllNodes(root);
    }
    public void visitAllNodes(TreeNode node) {
        // node is visited exactly once
        <font color="#0066ff"><i>process</i></font>(node);
    
        if (node.getChildCount() &gt;= 0) {
            for (Enumeration e=node.children(); e.hasMoreElements(); ) {
                TreeNode n = (TreeNode)e.nextElement();
                visitAllNodes(n);
            }
        }
    }
    
    // Traverse all expanded nodes in tree
    public void visitAllExpandedNodes(JTree tree) {
        TreeNode root = (TreeNode)tree.getModel().getRoot();
        visitAllExpandedNodes(tree, new TreePath(root));
    }
    public void visitAllExpandedNodes(JTree tree, TreePath parent) {
        // Return if node is not expanded
        if (!tree.isVisible(parent)) {
            return;
        }
    
        // node is visible and is visited exactly once
        TreeNode node = (TreeNode)parent.getLastPathComponent();
        <font color="#0066ff"><i>process</i></font>(node);
    
        // Visit all children
        if (node.getChildCount() &gt;= 0) {
            for (Enumeration e=node.children(); e.hasMoreElements(); ) {
                TreeNode n = (TreeNode)e.nextElement();
                TreePath path = parent.pathByAddingChild(n);
                visitAllExpandedNodes(tree, path);
            }
        }
    }
</pre>
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            &nbsp;Related Examples
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e1023. <a class="eglink" href="FindNode.html?l=rel">
    Finding a Node in a JTree Component
</a>
<br>

e1024. <a class="eglink" href="AddNode.html?l=rel">
    Adding a Node to a JTree Component
</a>
<br>

e1025. <a class="eglink" href="RemNode.html?l=rel">
    Removing a Node to a JTree Component
</a>
<br>

e1026. <a class="eglink" href="Node2Path.html?l=rel">
    Converting a Node in a JTree Component to a TreePath
</a>
<br>

e1027. <a class="eglink" href="Tree2Path.html?l=rel">
    Converting All Nodes in a JTree Component to a TreePath Array
</a>
<br>


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<br>
        See also: 
<a class="eglink" href="/egs/javax.swing.tree/pkg.html?l=rel#Events">
    Events
</a>&nbsp;&nbsp;

<a class="eglink" href="/egs/javax.swing.tree/pkg.html?l=rel#Layout">
    Layout
</a>&nbsp;&nbsp;

<a class="eglink" href="/egs/javax.swing.tree/pkg.html?l=rel#Node%20Expansion">
    Node Expansion
</a>&nbsp;&nbsp;

<a class="eglink" href="/egs/javax.swing.tree/pkg.html?l=rel#Selections">
    Selections
</a>&nbsp;&nbsp;

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