/*******************************************************************************
 * 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
 * D Port:
 *     Bill Baxter <wbaxter@gmail.com>
 *******************************************************************************/
module dwtsnippets.treeeditor.Snippet111;

/*
 * 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 dwt.DWT;
import dwt.graphics.Color;
import dwt.graphics.Rectangle;
import dwt.graphics.GC;
import dwt.widgets.Display;
import dwt.widgets.Shell;
import dwt.widgets.Widget;
import dwt.widgets.Composite;
import dwt.widgets.Tree;
import dwt.widgets.TreeItem;
import dwt.widgets.Text;
import dwt.widgets.Listener;
import dwt.widgets.Event;
import dwt.layout.FillLayout;
import dwt.custom.TreeEditor;

import dwt.dwthelper.utils : String, substring, Math;
import std.stdio;

import tango.util.Convert;

void main () {
	final Display display = new Display ();
	final Color black = display.getSystemColor (DWT.COLOR_BLACK);
	Shell shell = new Shell (display);
	shell.setLayout (new FillLayout ());
	final Tree tree = new Tree (shell, DWT.BORDER);
	for (int i=0; i<16; i++) {
		TreeItem itemI = new TreeItem (tree, DWT.NONE);
		itemI.setText ("Item " ~ to!(char[])(i));
		for (int j=0; j<16; j++) {
			TreeItem itemJ = new TreeItem (itemI, DWT.NONE);
			itemJ.setText ("Item " ~ to!(char[])(j) );
		}
	}
	final TreeItem [] lastItem = new TreeItem [1];
	final TreeEditor editor = new TreeEditor (tree);
	tree.addListener (DWT.Selection, new class Listener {
		public void handleEvent (Event event) {
			final TreeItem item = cast(TreeItem) event.item;
			if (item !is null && item is lastItem [0]) {
				bool showBorder = true;
				final Composite composite = new Composite (tree, DWT.NONE);
				if (showBorder) composite.setBackground (black);
				final Text text = new Text (composite, DWT.NONE);
				final int inset = showBorder ? 1 : 0;
				composite.addListener (DWT.Resize, new class 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 class Listener {
					public void handleEvent (Event e) {
						switch (e.type) {
                        case DWT.FocusOut: {
                            item.setText (text.getText ());
                            composite.dispose ();
                        }
                        break;
                        case DWT.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, DWT.DEFAULT);
                            editor.horizontalAlignment = DWT.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 DWT.Traverse: {
                            switch (e.detail) {
                            case DWT.TRAVERSE_RETURN:
                                item.setText (text.getText ());
                                //FALL THROUGH
                            case DWT.TRAVERSE_ESCAPE:
                                composite.dispose ();
                                e.doit = false;
                            default:
                                //no-op
                            }
                            break;
                        }
                        default:
                        // no-op
						}
					}
				};
				text.addListener (DWT.FocusOut, textListener);
				text.addListener (DWT.Traverse, textListener);
				text.addListener (DWT.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 ();
}