| /******************************************************************************* |
| * Copyright (c) 2000, 2005 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.layout.*; |
| import org.eclipse.swt.widgets.*; |
| import org.eclipse.swt.events.*; |
| import org.eclipse.swt.graphics.*; |
| import org.eclipse.swt.custom.*; |
| |
| /** |
| * StyledText snippet: embed images |
| * |
| * For a list of all SWT example snippets see |
| * http://www.eclipse.org/swt/snippets/ |
| * |
| * @since 3.2 |
| */ |
| public class Snippet212 { |
| |
| static StyledText styledText; |
| static String text = |
| "This snippet shows how to embed images in a StyledText.\n"+ |
| "Here is one: \uFFFC, and here is another: \uFFFC."+ |
| "Use the add button to add an image from your filesystem to the StyledText at the current caret offset."; |
| static Image[] images; |
| static int[] offsets; |
| |
| static void addImage(Image image, int offset) { |
| StyleRange style = new StyleRange (); |
| style.start = offset; |
| style.length = 1; |
| Rectangle rect = image.getBounds(); |
| style.metrics = new GlyphMetrics(rect.height, 0, rect.width); |
| styledText.setStyleRange(style); |
| } |
| |
| public static void main(String [] args) { |
| final Display display = new Display(); |
| final Shell shell = new Shell(display); |
| shell.setLayout(new GridLayout()); |
| styledText = new StyledText(shell, SWT.WRAP | SWT.BORDER); |
| styledText.setLayoutData(new GridData(SWT.FILL, SWT.FILL, true, true)); |
| styledText.setText(text); |
| images = new Image[] { |
| display.getSystemImage(SWT.ICON_QUESTION), |
| display.getSystemImage(SWT.ICON_INFORMATION), |
| }; |
| offsets = new int[images.length]; |
| int lastOffset = 0; |
| for (int i = 0; i < images.length; i++) { |
| int offset = text.indexOf("\uFFFC", lastOffset); |
| offsets[i] = offset; |
| addImage(images[i], offset); |
| lastOffset = offset + 1; |
| } |
| |
| // use a verify listener to keep the offsets up to date |
| styledText.addVerifyListener(new VerifyListener() { |
| public void verifyText(VerifyEvent e) { |
| int start = e.start; |
| int replaceCharCount = e.end - e.start; |
| int newCharCount = e.text.length(); |
| for (int i = 0; i < offsets.length; i++) { |
| int offset = offsets[i]; |
| if (start <= offset && offset < start + replaceCharCount) { |
| // this image is being deleted from the text |
| if (images[i] != null && !images[i].isDisposed()) { |
| images[i].dispose(); |
| images[i] = null; |
| } |
| offset = -1; |
| } |
| if (offset != -1 && offset >= start) offset += newCharCount - replaceCharCount; |
| offsets[i] = offset; |
| } |
| } |
| }); |
| styledText.addPaintObjectListener(new PaintObjectListener() { |
| public void paintObject(PaintObjectEvent event) { |
| GC gc = event.gc; |
| StyleRange style = event.style; |
| int start = style.start; |
| for (int i = 0; i < offsets.length; i++) { |
| int offset = offsets[i]; |
| if (start == offset) { |
| Image image = images[i]; |
| int x = event.x; |
| int y = event.y + event.ascent - style.metrics.ascent; |
| gc.drawImage(image, x, y); |
| } |
| } |
| } |
| }); |
| |
| Button button = new Button (shell, SWT.PUSH); |
| button.setText("Add Image"); |
| button.setLayoutData(new GridData(SWT.CENTER, SWT.CENTER, false, false)); |
| button.addListener(SWT.Selection, new Listener() { |
| public void handleEvent(Event event) { |
| FileDialog dialog = new FileDialog(shell); |
| String filename = dialog.open(); |
| if (filename != null) { |
| try { |
| Image image = new Image(display, filename); |
| int offset = styledText.getCaretOffset(); |
| styledText.replaceTextRange(offset, 0, "\uFFFC"); |
| int index = 0; |
| while (index < offsets.length) { |
| if (offsets[index] == -1 && images[index] == null) break; |
| index++; |
| } |
| if (index == offsets.length) { |
| int[] tmpOffsets = new int[index + 1]; |
| System.arraycopy(offsets, 0, tmpOffsets, 0, offsets.length); |
| offsets = tmpOffsets; |
| Image[] tmpImages = new Image[index + 1]; |
| System.arraycopy(images, 0, tmpImages, 0, images.length); |
| images = tmpImages; |
| } |
| offsets[index] = offset; |
| images[index] = image; |
| addImage(image, offset); |
| } catch (Exception e) { |
| e.printStackTrace(); |
| } |
| } |
| } |
| }); |
| shell.setSize(400, 400); |
| shell.open(); |
| while (!shell.isDisposed()) { |
| if (!display.readAndDispatch()) |
| display.sleep(); |
| } |
| for (int i = 0; i < images.length; i++) { |
| Image image = images[i]; |
| if (image != null && !image.isDisposed()) { |
| image.dispose(); |
| } |
| } |
| display.dispose(); |
| } |
| } |