Java JTree:以编程方式选择所有节点
我有一个Jtree和两个按钮来选择和取消选择所有节点。我做了这样的尝试:Java JTree:以编程方式选择所有节点,java,swing,select,jtree,unselect,Java,Swing,Select,Jtree,Unselect,我有一个Jtree和两个按钮来选择和取消选择所有节点。我做了这样的尝试: selectAll = new JButton("Select all"); selectAll.addActionListener(new ActionListener (){ @Override public void actionPerformed(ActionEvent e) { int row = 0; while (
selectAll = new JButton("Select all");
selectAll.addActionListener(new ActionListener (){
@Override
public void actionPerformed(ActionEvent e) {
int row = 0;
while (row < curvesTree.getRowCount())
{
curvesTree.expandRow(row);
row++;
}
int entradasTree = curvesTree.getRowCount();
for(int i=0; i<entradasTree; i++){
TreePath path = curvesTree.getPathForRow(i);
curvesTree.setSelectionPath(path);
}
}
});
unselectAll = new JButton("Unselect all");
unselectAll.addActionListener(new ActionListener (){
@Override
public void actionPerformed(ActionEvent e) {
curvesTree.clearSelection();
}
});
curvesTree = new JTree(rootNode);
curvesTree.setExpandsSelectedPaths(true);
curvesTree.getSelectionModel().setSelectionMode(TreeSelectionModel.
DISCONTIGUOUS_TREE_SELECTION);
是的,这是可能的,例如:
import java.awt.Dimension;
import javax.swing.*;
import javax.swing.event.*;
import javax.swing.tree.*;
public class TreeWithMultiDiscontiguousSelections {
public static void main(String[] argv) {
JTree tree = new JTree();
tree.getSelectionModel().setSelectionMode(TreeSelectionModel.DISCONTIGUOUS_TREE_SELECTION);
int treeSelectedRows[] = {3, 1};
tree.setSelectionRows(treeSelectedRows);
TreeSelectionListener treeSelectionListener = new TreeSelectionListener() {
@Override
public void valueChanged(TreeSelectionEvent treeSelectionEvent) {
JTree treeSource = (JTree) treeSelectionEvent.getSource();
System.out.println("Min: " + treeSource.getMinSelectionRow());
System.out.println("Max: " + treeSource.getMaxSelectionRow());
System.out.println("Lead: " + treeSource.getLeadSelectionRow());
System.out.println("Row: " + treeSource.getSelectionRows()[0]);
}
};
tree.addTreeSelectionListener(treeSelectionListener);
JFrame frame = new JFrame("JTree With Multi-Discontiguous selection");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.add(new JScrollPane(tree));
frame.setPreferredSize(new Dimension(380, 320));
frame.setLocation(150, 150);
frame.pack();
frame.setVisible(true);
}
private TreeWithMultiDiscontiguousSelections() {
}
}
取消选择是因为您正在设置新的选择路径而不是添加。在展开后的循环中,改为
curvesTree.addSelectionPath(...)
编辑
阅读api总是很有启发性的,即使是几年之后;-)刚刚找到了一个非常简单的方法,将所有工作留给树:
tree.setSelectionInterval(0, tree.getRowCount());
我想补充一下克利奥帕特拉的答案(基于我自己成长的痛苦) 在我的特殊问题中,我需要在
JTree
节点弹出菜单中添加一个“选择所有子项”菜单项。因此,此解决方案适用于选定节点的所有子节点
TreeNode selectedNode = tree.getSelectionPath().getLastPathComponent();
// Expand tree from selected node...
List<TreePath> paths = new ArrayList<TreePath>();
determineTreePaths(selectedNode, paths); // Recursive method call...
TreePath[] treePaths = new TreePath[paths.size()];
Iterator<TreePath> iter = paths.iterator();
for (int i = 0; iter.hasNext(); ++i)
{
treePaths[i] = iter.next();
}
if (paths.size() > 0)
{
TreePath firstElement = paths.get(0);
setSelectionPath(firstElement);
scrollPathToVisible(firstElement);
}
出色的接球,你怎么+1谢谢,我已经找了半天了:)
private void determineTreePaths(TreeNode currentNode, List<TreePath> paths)
{
paths.add(new TreePath(((DefaultTreeModel) getDefaultTreeModel()).getPathToRoot(currentNode));
// Get all of my Children
Enumeration<?> children = currentNode.children();
// iterate over my children
while (children.hasMoreElements())
{
TreeNode child = (TreeNode) children.nextElement();
determineTreePaths(child, paths);
}
}