в 17:44, 31 мая 2010

2010-05-31T17:44:27Z

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2010-05-31T15:32:13Z

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== Allow multiple selections of visible nodes ==



<source lang="java">
import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.JTree;
import javax.swing.tree.TreeSelectionModel;
public class TreeDISCONTIGUOUSSelection {
public static void main(String[] argv) {
JTree tree = new JTree();
tree.getSelectionModel().setSelectionMode(TreeSelectionModel.DISCONTIGUOUS_TREE_SELECTION);
JFrame frame = new JFrame("tree DISCONTIGUOUS selection");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.add(new JScrollPane(tree));
frame.setSize(380, 320);
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
}</source>



== Allow only a single node to be selected (default) ==



<source lang="java">
import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.JTree;
import javax.swing.tree.TreeSelectionModel;

public class TreeSingleSelection {
public static void main(String[] argv) {
JTree tree = new JTree();
tree.getSelectionModel().setSelectionMode(TreeSelectionModel.SINGLE_TREE_SELECTION);
JFrame frame = new JFrame("Tree single selection");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.add(new JScrollPane(tree));
frame.setSize(380, 320);
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
}</source>



== Allow selection to span one vertical contiguous set of visible nodes ==



<source lang="java">
import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.JTree;
import javax.swing.tree.TreeSelectionModel;
public class TreeCONTIGUOUSSelection {
public static void main(String[] argv) {
JTree tree = new JTree();
tree.getSelectionModel().setSelectionMode(TreeSelectionModel.CONTIGUOUS_TREE_SELECTION);
JFrame frame = new JFrame("Tree CONTIGUOUS selection");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.add(new JScrollPane(tree));
frame.setSize(380, 320);
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
}</source>



== Determine if the third item is selected ==



<source lang="java">
import javax.swing.JList;
public class Main {
public static void main(String[] argv) throws Exception {
String[] items = { "A", "B", "C", "D" };
JList list = new JList(items);
int index = 2;
boolean isSel = list.isSelectedIndex(index);
}
}</source>



== Enabling and Disabling Multiple Selections in a JTree Component ==



<source lang="java">
import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.JTree;
import javax.swing.tree.TreeSelectionModel;
public class TreeSelectionOption {
public static void main(String[] argv) {
JTree tree = new JTree();
tree.getSelectionModel().setSelectionMode(TreeSelectionModel.SINGLE_TREE_SELECTION);
tree.getSelectionModel().setSelectionMode(TreeSelectionModel.CONTIGUOUS_TREE_SELECTION);
tree.getSelectionModel().setSelectionMode(TreeSelectionModel.DISCONTIGUOUS_TREE_SELECTION);
JFrame frame = new JFrame();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.add(new JScrollPane(tree));
frame.setSize(380, 320);
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
}</source>



== Getting the Selected Nodes in a JTree Component ==



<source lang="java">
import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.JTree;
import javax.swing.tree.TreePath;
public class Main {
public static void main(String[] argv) throws Exception {
JTree tree = new JTree();
JFrame f = new JFrame();
f.add(new JScrollPane(tree));
f.setSize(300, 300);
f.setVisible(true);
// Get paths of all selected nodes
TreePath[] paths = tree.getSelectionPaths();
}
}</source>



== Listening for Selection Events in a JTree Component ==



<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>



== Returns a TreePath containing the specified node. ==



<source lang="java">
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import javax.swing.tree.TreeNode;
import javax.swing.tree.TreePath;
public class Main {

public TreePath getPath(TreeNode node) {
List<TreeNode> list = new ArrayList<TreeNode>();
while (node != null) {
list.add(node);
node = node.getParent();
}
Collections.reverse(list);
return new TreePath(list.toArray());
}
}</source>

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в 17:44, 31 мая 2010

Admin: 1 версия