org.eclipse.swt.snippets.Snippet111.java Source code

Introduction

Here is the source code for org.eclipse.swt.snippets.Snippet111.java

Source

/*******************************************************************************
 * Copyright (c) 2000, 2016 IBM Corporation and others.
 *
 * This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License 2.0
 * which accompanies this distribution, and is available at
 * https://www.eclipse.org/legal/epl-2.0/
 *
 * SPDX-License-Identifier: EPL-2.0
 *
 * 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.*;
import org.eclipse.swt.custom.*;
import org.eclipse.swt.graphics.*;
import org.eclipse.swt.layout.*;
import org.eclipse.swt.widgets.*;

public class Snippet111 {

    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.setText("Snippet 111");
        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, event -> {
            final TreeItem item = (TreeItem) event.item;
            if (item != null && item == lastItem[0]) {
                boolean showBorder = true;
                final Composite composite = new Composite(tree, SWT.NONE);
                if (showBorder)
                    composite.setBackground(black);
                final Text text = new Text(composite, SWT.NONE);
                final int inset = showBorder ? 1 : 0;
                composite.addListener(SWT.Resize, e1 -> {
                    Rectangle rect1 = composite.getClientArea();
                    text.setBounds(rect1.x + inset, rect1.y + inset, rect1.width - inset * 2,
                            rect1.height - inset * 2);
                });
                Listener textListener = e2 -> {
                    switch (e2.type) {
                    case SWT.FocusOut:
                        item.setText(text.getText());
                        composite.dispose();
                        break;
                    case SWT.Verify:
                        String newText = text.getText();
                        String leftText = newText.substring(0, e2.start);
                        String rightText = newText.substring(e2.end, newText.length());
                        GC gc = new GC(text);
                        Point size = gc.textExtent(leftText + e2.text + rightText);
                        gc.dispose();
                        size = text.computeSize(size.x, SWT.DEFAULT);
                        editor.horizontalAlignment = SWT.LEFT;
                        Rectangle itemRect = item.getBounds(), rect2 = tree.getClientArea();
                        editor.minimumWidth = Math.max(size.x, itemRect.width) + inset * 2;
                        int left = itemRect.x, right = rect2.x + rect2.width;
                        editor.minimumWidth = Math.min(editor.minimumWidth, right - left);
                        editor.minimumHeight = size.y + inset * 2;
                        editor.layout();
                        break;
                    case SWT.Traverse:
                        switch (e2.detail) {
                        case SWT.TRAVERSE_RETURN:
                            item.setText(text.getText());
                            //FALL THROUGH
                        case SWT.TRAVERSE_ESCAPE:
                            composite.dispose();
                            e2.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();
    }
}