如何双击 JTree 节点并获取其名称?
如果我调用evt.getSource()
它,返回的对象似乎是一个 JTree。我不能将它转换为 DefaultMutableTreeNode。
如何双击 JTree 节点并获取其名称?
如果我调用evt.getSource()
它,返回的对象似乎是一个 JTree。我不能将它转换为 DefaultMutableTreeNode。
From the Java Docs
If you are interested in detecting either double-click events or when a user clicks on a node, regardless of whether or not it was selected, we recommend you do the following:
final JTree tree = ...;
MouseListener ml = new MouseAdapter() {
public void mousePressed(MouseEvent e) {
int selRow = tree.getRowForLocation(e.getX(), e.getY());
TreePath selPath = tree.getPathForLocation(e.getX(), e.getY());
if(selRow != -1) {
if(e.getClickCount() == 1) {
mySingleClick(selRow, selPath);
}
else if(e.getClickCount() == 2) {
myDoubleClick(selRow, selPath);
}
}
}
};
tree.addMouseListener(ml);
To get the nodes from the TreePath
you can walk the path or simply, in your case, use TreePath#getLastPathComponent
.
This returns an Object
, so you will need to cast back to the required node type yourself.
以下代码适用于我。
tree.addMouseListener(new MouseAdapter() {
public void mouseClicked(MouseEvent e) {
if (e.getClickCount() == 2) {
DefaultMutableTreeNode node = (DefaultMutableTreeNode)
tree.getLastSelectedPathComponent();
if (node == null) return;
Object nodeInfo = node.getUserObject();
// Cast nodeInfo to your object and do whatever you want
}
}
});
MadProgrammer 几乎涵盖了所有内容。要获取您可以调用的对象
DefaultMutableTreeNode selectedNode =
((DefaultMutableTreeNode)selPath.getLastPathComponent()).
getUserObject();
我的例子。我们可以检测到有延迟的双击。
public class TreeListener extends MouseAdapter{
private JTree _Tree;
private boolean singleClick = true;
private int doubleClickDelay = 300;
private Timer timer;
public TreeListener(JTree tree)
{
this._Tree = tree;
ActionListener actionListener = new ActionListener() {
public void actionPerformed(ActionEvent e) {
timer.stop();
if (singleClick) {
singleClickHandler(e);
} else {
try {
doubleClickHandler(e);
} catch (ParseException ex) {
Logger.getLogger(ex.getMessage());
}
}
}
};
timer = new javax.swing.Timer(doubleClickDelay, actionListener);
timer.setRepeats(false);
}
public void mouseClicked(MouseEvent e) {
if (e.getClickCount() == 1) {
singleClick = true;
timer.start();
} else {
singleClick = false;
}
}
private void singleClickHandler(ActionEvent e) {
System.out.println("-- single click --");
}
private void doubleClickHandler(ActionEvent e) throws ParseException {
System.out.println("-- double click -- id=");
}
}