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/*****************************************************************************
* Copyright (c) 2016 CEA LIST 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:
* Vincent Lorenzo (CEA LIST) vincent.lorenzo@cea.fr
*****************************************************************************/
package org.eclipse.papyrus.uml.diagram.common.figure.node;
import org.eclipse.draw2d.IFigure;
import org.eclipse.draw2d.ImageFigure;
import org.eclipse.draw2d.ScrollPane;
import org.eclipse.gmf.runtime.draw2d.ui.internal.figures.AnimatableScrollPane;
import org.eclipse.nebula.widgets.richtext.RichTextPainter;
import org.eclipse.papyrus.uml.diagram.common.Activator;
import org.eclipse.swt.graphics.GC;
import org.eclipse.swt.graphics.Image;
import org.eclipse.swt.graphics.ImageData;
import org.eclipse.swt.graphics.Point;
import org.eclipse.swt.graphics.Rectangle;
import org.eclipse.swt.widgets.Display;
/**
* @since 2.0
*/
public class RichTextRenderer implements HTMLRenderer {
/** HTML painter */
protected RichTextPainter painter;
/** Figure to paint on */
protected ImageFigure renderFigure;
/** Image representing HTML content */
protected Image htmlImage;
private boolean validated;
/**
* Scroll pane to wrap the renderFigure
*/
protected AnimatableScrollPane contentPane;
//protected ScrollPane contentPane;
@Override
public IFigure getFigure() {
renderFigure = new ImageFigure();
renderFigure.setOpaque(false);
contentPane = new AnimatableScrollPane();
//contentPane = new ScrollPane();
contentPane.setOpaque(false);
contentPane.setScrollBarVisibility(ScrollPane.AUTOMATIC);
contentPane.setContents(renderFigure);
painter = new RichTextPainter(true);
validated = false;
return contentPane;
}
@Override
public void paintHTML(String text, int width, int height, int x, int y) {
if (renderFigure == null || painter == null || contentPane == null) {
return;
}
// Validate first time, otherwise infinite layout loop
if (!validated) {
contentPane.setPreferredSize(width, height);
contentPane.validate();
}
if (htmlImage != null) {
htmlImage.dispose();
}
// Create a transparent background
htmlImage = getTransparentBackground(Display.getDefault(), width, height);
if (htmlImage == null) {
htmlImage = new Image(Display.getDefault(), width, height);
}
if (htmlImage != null) {
// Compute the preferred size of the image to display all of the HTML content
GC gc = new GC(htmlImage);
Rectangle bounds = new Rectangle(x, y, width, height);
painter.preCalculate(text != null ? text : "", gc, bounds, true);
boolean changeBounds = false;
if (width < getPreferredSize().x) {
width = getPreferredSize().x;
changeBounds = true;
}
if (height < getPreferredSize().y) {
height = getPreferredSize().y;
changeBounds = true;
}
// Changing bounds means creating a new image with new width and height, its gc, and the new bounds for the painter
if (changeBounds) {
gc.dispose();
htmlImage.dispose();
htmlImage = getTransparentBackground(Display.getDefault(), width, height);
if (htmlImage == null) {
htmlImage = new Image(Display.getDefault(), width, height);
}
gc = new GC(htmlImage);
bounds = new Rectangle(x, y, width, height);
}
// Paint and clean up
painter.paintHTML(text != null ? text : "", gc, bounds); //$NON-NLS-1$
if (gc != null) {
gc.dispose();
}
renderFigure.setImage(htmlImage);
}
}
@Override
public Point getPreferredSize() {
return painter.getPreferredSize();
}
private Image getTransparentBackground(Display device, int width, int height) {
try {
Image src = new Image(device, width, height);
ImageData imageData = src.getImageData();
imageData.alpha = 0;
src.dispose();
return new Image(device, imageData);
} catch (Exception e) {
Activator.log.error(e);
}
return null;
}
}
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