Mega Code Archive
Demonstrates TreeEditor
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import org.eclipse.swt.SWT;
import org.eclipse.swt.custom.*;
import org.eclipse.swt.events.*;
import org.eclipse.swt.layout.*;
import org.eclipse.swt.widgets.*;
/**
* This class demonstrates TreeEditor
*/
public class TextTreeEditor {
// Constant for how many items to create at each level
private static final int NUM = 3;
/**
* Runs the //Send questions, comments, bug reports, etc. to the authors:
//Rob Warner (rwarner@interspatial.com)
//Robert Harris (rbrt_harris@yahoo.com)application
*/
public void run() {
Display display = new Display();
Shell shell = new Shell(display);
shell.setText("Text Tree Editor");
createContents(shell);
shell.open();
while (!shell.isDisposed()) {
if (!display.readAndDispatch()) {
display.sleep();
}
}
display.dispose();
}
/**
* Creates the contents of the main window
*
* @param shell the main window
*/
public void createContents(Shell shell) {
shell.setLayout(new FillLayout());
// Create the tree
final Tree tree = new Tree(shell, SWT.SINGLE);
// Fill the tree with data
for (int i = 0; i < NUM; i++) {
TreeItem iItem = new TreeItem(tree, SWT.NONE);
iItem.setText("Item " + (i + 1));
for (int j = 0; j < NUM; j++) {
TreeItem jItem = new TreeItem(iItem, SWT.NONE);
jItem.setText("Sub Item " + (j + 1));
for (int k = 0; k < NUM; k++) {
new TreeItem(jItem, SWT.NONE).setText("Sub Sub Item " + (k + 1));
}
jItem.setExpanded(true);
}
iItem.setExpanded(true);
}
// Create the editor and set its attributes
final TreeEditor editor = new TreeEditor(tree);
editor.horizontalAlignment = SWT.LEFT;
editor.grabHorizontal = true;
// Add a key listener to the tree that listens for F2.
// If F2 is pressed, we do the editing
tree.addKeyListener(new KeyAdapter() {
public void keyPressed(KeyEvent event) {
// Make sure one and only one item is selected when F2 is pressed
if (event.keyCode == SWT.F2 && tree.getSelectionCount() == 1) {
// Determine the item to edit
final TreeItem item = tree.getSelection()[0];
// Create a text field to do the editing
final Text text = new Text(tree, SWT.NONE);
text.setText(item.getText());
text.selectAll();
text.setFocus();
// If the text field loses focus, set its text into the tree
// and end the editing session
text.addFocusListener(new FocusAdapter() {
public void focusLost(FocusEvent event) {
item.setText(text.getText());
text.dispose();
}
});
// If they hit Enter, set the text into the tree and end the editing
// session. If they hit Escape, ignore the text and end the editing
// session
text.addKeyListener(new KeyAdapter() {
public void keyPressed(KeyEvent event) {
switch (event.keyCode) {
case SWT.CR:
// Enter hit--set the text into the tree and drop through
item.setText(text.getText());
case SWT.ESC:
// End editing session
text.dispose();
break;
}
}
});
// Set the text field into the editor
editor.setEditor(text, item);
}
}
});
}
/**
* The application entry point
*
* @param args the command line arguments
*/
public static void main(String[] args) {
new TextTreeEditor().run();
}
}
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