| /******************************************************************************* |
| * Copyright (c) 2000, 2016 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; |
| |
| import org.eclipse.swt.*; |
| import org.eclipse.swt.custom.*; |
| import org.eclipse.swt.graphics.*; |
| import org.eclipse.swt.layout.*; |
| import org.eclipse.swt.widgets.*; |
| |
| /** |
| * StyledText snippet: embed controls |
| * |
| * For a list of all SWT example snippets see |
| * http://www.eclipse.org/swt/snippets/ |
| * |
| * @since 3.2 |
| */ |
| public class Snippet217 { |
| |
| static StyledText styledText; |
| static String text = |
| "This snippet shows how to embed widgets in a StyledText.\n"+ |
| "Here is one: \uFFFC, and here is another: \uFFFC."; |
| static int MARGIN = 5; |
| |
| static void addControl(Control control, int offset) { |
| StyleRange style = new StyleRange (); |
| style.start = offset; |
| style.length = 1; |
| style.data = control; |
| control.pack(); |
| Rectangle rect = control.getBounds(); |
| int ascent = 2*rect.height/3; |
| int descent = rect.height - ascent; |
| style.metrics = new GlyphMetrics(ascent + MARGIN, descent + MARGIN, rect.width + 2*MARGIN); |
| styledText.setStyleRange(style); |
| } |
| |
| public static void main(String [] args) { |
| final Display display = new Display(); |
| Font font = new Font(display, "Tahoma", 16, SWT.NORMAL); |
| final Shell shell = new Shell(display); |
| shell.setLayout(new GridLayout()); |
| styledText = new StyledText(shell, SWT.WRAP | SWT.BORDER); |
| styledText.setFont(font); |
| styledText.setLayoutData(new GridData(SWT.FILL, SWT.FILL, true, true)); |
| styledText.setText(text); |
| Button button = new Button(styledText, SWT.PUSH); |
| button.setText("Button 1"); |
| int offset = text.indexOf('\uFFFC'); |
| addControl(button, offset); |
| button.setLocation(styledText.getLocationAtOffset(offset)); |
| Combo combo = new Combo(styledText, SWT.NONE); |
| combo.add("item 1"); |
| combo.add("another item"); |
| combo.setText(combo.getItem(0)); |
| offset = text.indexOf('\uFFFC', offset + 1); |
| addControl(combo, offset); |
| combo.setLocation(styledText.getLocationAtOffset(offset)); |
| |
| // use a verify listener to dispose the controls |
| styledText.addVerifyListener(event -> { |
| if (event.start == event.end) return; |
| String text = styledText.getText(event.start, event.end - 1); |
| int index = text.indexOf('\uFFFC'); |
| while (index != -1) { |
| StyleRange style = styledText.getStyleRangeAtOffset(event.start + index); |
| if (style != null) { |
| Control control = (Control)style.data; |
| if (control != null) control.dispose(); |
| } |
| index = text.indexOf('\uFFFC', index + 1); |
| } |
| }); |
| |
| // reposition widgets on paint event |
| styledText.addPaintObjectListener(event -> { |
| Control control = (Control)event.style.data; |
| Point pt = control.getSize(); |
| int x = event.x + MARGIN; |
| int y = event.y + event.ascent - 2*pt.y/3; |
| control.setLocation(x, y); |
| }); |
| |
| shell.setSize(400, 400); |
| shell.open(); |
| while (!shell.isDisposed()) { |
| if (!display.readAndDispatch()) |
| display.sleep(); |
| } |
| font.dispose(); |
| display.dispose(); |
| } |
| } |