如何捕捉 JTree 节点扩展事件
How to catch JTree node expanded event
我在SWING JTree中寻求一种类似于SWT的方法
TreeNode.addListener(SWT.Expand, 新的监听器()...
我设法检查最后选定的节点以找到选定的节点,但我如何才能找到扩展的节点并以正确的方式处理它?
使用(有趣的名字)TreeWillExpandListener
。
TreeWillExpandListener treeWillExpandListener = new TreeWillExpandListener() {
public void treeWillCollapse(TreeExpansionEvent treeExpansionEvent)
throws ExpandVetoException {
TreePath path = treeExpansionEvent.getPath();
DefaultMutableTreeNode node = (DefaultMutableTreeNode) path.getLastPathComponent();
//Print the name of the node if toString() was implemented
String data = node.getUserObject().toString();
System.out.println("WillCollapse: " + data);
}
public void treeWillExpand(TreeExpansionEvent treeExpansionEvent) throws ExpandVetoException {
TreePath path = treeExpansionEvent.getPath();
DefaultMutableTreeNode node = (DefaultMutableTreeNode) path.getLastPathComponent();
//print the name of the node if toString was implemented
String data = node.getUserObject().toString();
System.out.println("WillExpand: " + data);
}
};
tree.addTreeWillExpandListener(treeWillExpandListener);
我在SWING JTree中寻求一种类似于SWT的方法 TreeNode.addListener(SWT.Expand, 新的监听器()... 我设法检查最后选定的节点以找到选定的节点,但我如何才能找到扩展的节点并以正确的方式处理它?
使用(有趣的名字)TreeWillExpandListener
。
TreeWillExpandListener treeWillExpandListener = new TreeWillExpandListener() {
public void treeWillCollapse(TreeExpansionEvent treeExpansionEvent)
throws ExpandVetoException {
TreePath path = treeExpansionEvent.getPath();
DefaultMutableTreeNode node = (DefaultMutableTreeNode) path.getLastPathComponent();
//Print the name of the node if toString() was implemented
String data = node.getUserObject().toString();
System.out.println("WillCollapse: " + data);
}
public void treeWillExpand(TreeExpansionEvent treeExpansionEvent) throws ExpandVetoException {
TreePath path = treeExpansionEvent.getPath();
DefaultMutableTreeNode node = (DefaultMutableTreeNode) path.getLastPathComponent();
//print the name of the node if toString was implemented
String data = node.getUserObject().toString();
System.out.println("WillExpand: " + data);
}
};
tree.addTreeWillExpandListener(treeWillExpandListener);