Java by API/javax.swing.event/TreeSelectionEvent — различия между версиями
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Текущая версия на 17:33, 31 мая 2010
TreeSelectionEvent: getNewLeadSelectionPath()
<source lang="java">
import java.awt.BorderLayout; import java.awt.GridLayout; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import javax.swing.JButton; import javax.swing.JFrame; import javax.swing.JPanel; import javax.swing.JScrollPane; import javax.swing.JTextField; import javax.swing.JTree; import javax.swing.event.TreeSelectionEvent; import javax.swing.event.TreeSelectionListener; import javax.swing.tree.DefaultMutableTreeNode; import javax.swing.tree.DefaultTreeModel; import javax.swing.tree.MutableTreeNode; import javax.swing.tree.TreePath; public class MainClass extends JPanel {
public static void main(String[] args) { // create a hierarchy of nodes MutableTreeNode root = new DefaultMutableTreeNode("A"); MutableTreeNode bNode = new DefaultMutableTreeNode("B"); MutableTreeNode cNode = new DefaultMutableTreeNode("C"); root.insert(bNode, 0); root.insert(cNode, 1); bNode.insert(new DefaultMutableTreeNode("1"), 0); bNode.insert(new DefaultMutableTreeNode("2"), 1); cNode.insert(new DefaultMutableTreeNode("1"), 0); cNode.insert(new DefaultMutableTreeNode("2"), 1); final DefaultTreeModel model = new DefaultTreeModel(root); final JTree tree = new JTree(model); final JTextField nameField = new JTextField("Z"); final JButton button = new JButton("Add"); button.setEnabled(false); button.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent e) { TreePath tp = tree.getSelectionPath(); MutableTreeNode insertNode = (MutableTreeNode) tp.getLastPathComponent(); int insertIndex = 0; if (insertNode.getParent() != null) { MutableTreeNode parent = (MutableTreeNode) insertNode.getParent(); insertIndex = parent.getIndex(insertNode) + 1; insertNode = parent; } MutableTreeNode node = new DefaultMutableTreeNode(nameField.getText()); model.insertNodeInto(node, insertNode, insertIndex); } }); JPanel addPanel = new JPanel(new GridLayout(2, 1)); addPanel.add(nameField); addPanel.add(button); tree.addTreeSelectionListener(new TreeSelectionListener() { public void valueChanged(TreeSelectionEvent e) { TreePath tp = e.getNewLeadSelectionPath(); button.setEnabled(tp != null); } }); JFrame frame = new JFrame(); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.setSize(200, 200); frame.getContentPane().add(new JScrollPane(tree)); frame.getContentPane().add(addPanel, BorderLayout.SOUTH); frame.setVisible(true); }
}
</source>
TreeSelectionEvent: isAddedPath(int index)
<source lang="java">
import javax.swing.JTree; import javax.swing.event.TreeSelectionEvent; import javax.swing.event.TreeSelectionListener; import javax.swing.tree.TreePath; public class Main {
public static void main(String[] argv) throws Exception { JTree tree = new JTree(); tree.addTreeSelectionListener(new TreeSelectionListener() { public void valueChanged(TreeSelectionEvent evt) { TreePath[] paths = evt.getPaths(); for (int i = 0; i < paths.length; i++) { if (evt.isAddedPath(i)) { System.out.println("This node has been selected"); } else { System.out.println("This node has been deselected"); } } } }); }
}
</source>