Mega Code Archive
Add Tree cell editor
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/*******************************************************************************
* Copyright (c) 2000, 2004 IBM Corporation and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* IBM Corporation - initial API and implementation
*******************************************************************************/
//package org.eclipse.swt.snippets;
/*
* TreeEditor example snippet: edit the text of a tree item (in place, fancy)
*
* For a list of all SWT example snippets see
* http://www.eclipse.org/swt/snippets/
*/
import org.eclipse.swt.SWT;
import org.eclipse.swt.custom.TreeEditor;
import org.eclipse.swt.graphics.Color;
import org.eclipse.swt.graphics.GC;
import org.eclipse.swt.graphics.Point;
import org.eclipse.swt.graphics.Rectangle;
import org.eclipse.swt.layout.FillLayout;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Event;
import org.eclipse.swt.widgets.Listener;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.swt.widgets.Text;
import org.eclipse.swt.widgets.Tree;
import org.eclipse.swt.widgets.TreeItem;
public class TreeCellEditor {
public static void main(String[] args) {
final Display display = new Display();
final Color black = display.getSystemColor(SWT.COLOR_BLACK);
Shell shell = new Shell(display);
shell.setLayout(new FillLayout());
final Tree tree = new Tree(shell, SWT.BORDER);
for (int i = 0; i < 16; i++) {
TreeItem itemI = new TreeItem(tree, SWT.NONE);
itemI.setText("Item " + i);
for (int j = 0; j < 16; j++) {
TreeItem itemJ = new TreeItem(itemI, SWT.NONE);
itemJ.setText("Item " + j);
}
}
final TreeItem[] lastItem = new TreeItem[1];
final TreeEditor editor = new TreeEditor(tree);
tree.addListener(SWT.Selection, new Listener() {
public void handleEvent(Event event) {
final TreeItem item = (TreeItem) event.item;
if (item != null && item == lastItem[0]) {
boolean isCarbon = SWT.getPlatform().equals("carbon");
final Composite composite = new Composite(tree, SWT.NONE);
if (!isCarbon)
composite.setBackground(black);
final Text text = new Text(composite, SWT.NONE);
final int inset = isCarbon ? 0 : 1;
composite.addListener(SWT.Resize, new Listener() {
public void handleEvent(Event e) {
Rectangle rect = composite.getClientArea();
text.setBounds(rect.x + inset, rect.y + inset, rect.width - inset * 2, rect.height
- inset * 2);
}
});
Listener textListener = new Listener() {
public void handleEvent(final Event e) {
switch (e.type) {
case SWT.FocusOut:
item.setText(text.getText());
composite.dispose();
break;
case SWT.Verify:
String newText = text.getText();
String leftText = newText.substring(0, e.start);
String rightText = newText.substring(e.end, newText.length());
GC gc = new GC(text);
Point size = gc.textExtent(leftText + e.text + rightText);
gc.dispose();
size = text.computeSize(size.x, SWT.DEFAULT);
editor.horizontalAlignment = SWT.LEFT;
Rectangle itemRect = item.getBounds(),
rect = tree.getClientArea();
editor.minimumWidth = Math.max(size.x, itemRect.width) + inset * 2;
int left = itemRect.x,
right = rect.x + rect.width;
editor.minimumWidth = Math.min(editor.minimumWidth, right - left);
editor.minimumHeight = size.y + inset * 2;
editor.layout();
break;
case SWT.Traverse:
switch (e.detail) {
case SWT.TRAVERSE_RETURN:
item.setText(text.getText());
// FALL THROUGH
case SWT.TRAVERSE_ESCAPE:
composite.dispose();
e.doit = false;
}
break;
}
}
};
text.addListener(SWT.FocusOut, textListener);
text.addListener(SWT.Traverse, textListener);
text.addListener(SWT.Verify, textListener);
editor.setEditor(composite, item);
text.setText(item.getText());
text.selectAll();
text.setFocus();
}
lastItem[0] = item;
}
});
shell.pack();
shell.open();
while (!shell.isDisposed()) {
if (!display.readAndDispatch())
display.sleep();
}
display.dispose();
}
}
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