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Flying Saucer is a CSS 2.1 renderer written in Java. This artifact contains the core rendering and layout code as well as Java2D output.
/*
* {{{ header & license
* Copyright (c) 2007 Christophe Marchand
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public License
* as published by the Free Software Foundation; either version 2.1
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
* }}}
*/
package org.xhtmlrenderer.swing;
import java.awt.*;
import java.awt.geom.AffineTransform;
import java.awt.print.PrinterGraphics;
import java.io.InputStream;
import java.util.ArrayList;
import org.w3c.dom.Document;
import org.xhtmlrenderer.extend.UserAgentCallback;
import org.xhtmlrenderer.layout.Layer;
import org.xhtmlrenderer.layout.PaintingInfo;
import org.xhtmlrenderer.render.Box;
import org.xhtmlrenderer.render.RenderingContext;
import org.xhtmlrenderer.simple.XHTMLPanel;
/**
* ScalableXHTMLPanel extends {@see XHTMLPanel} to allow zoom on output.
*
* @author chm
*/
public class ScalableXHTMLPanel extends XHTMLPanel {
public static final int SCALE_POLICY_NONE = 0;
public static final int SCALE_POLICY_FIT_WIDTH = 0x01;
public static final int SCALE_POLICY_FIT_HEIGHT = 0x02;
public static final int SCALE_POLICY_FIT_WHOLE = SCALE_POLICY_FIT_WIDTH + SCALE_POLICY_FIT_HEIGHT;
private static final long serialVersionUID = 1L;
private int scalePolicy = SCALE_POLICY_NONE;
private double scale = -1.0d;
private ArrayList scListeners = null;
/**
* The lastly calculated layout size
*/
private Dimension lastLayoutSize = null;
/**
* Instantiates an XHTMLPanel with no {@link Document} loaded by default.
*/
public ScalableXHTMLPanel() {
super();
scListeners = new ArrayList();
}
/**
* Instantiates a panel with a custom {@link org.xhtmlrenderer.extend.UserAgentCallback}
* implementation.
*
* @param uac The custom UserAgentCallback implementation.
*/
public ScalableXHTMLPanel(UserAgentCallback uac) {
super(uac);
scListeners = new ArrayList();
}
/**
* Renders a Document using a URL as a base URL for relative
* paths.
*
* @param doc The new document value
* @param url The new document value
*/
public void setDocument(Document doc, String url) {
resetScaleAccordingToPolicy();
lastLayoutSize = null;
super.setDocument(doc, url);
}
/**
* Renders a Document read from an InputStream using a URL
* as a base URL for relative paths.
*
* @param stream The stream to read the Document from.
* @param url The URL used to resolve relative path references.
*/
public void setDocument(InputStream stream, String url) throws Exception {
resetScaleAccordingToPolicy();
lastLayoutSize = null;
super.setDocument(stream, url);
}
private void resetScaleAccordingToPolicy() {
if (getScalePolicy() != SCALE_POLICY_NONE) scale = -1.0d;
}
/**
* Search Box according to scale factor
*
* @param x The displayed x position
* @param y the displayed y position
*/
public Box find(int x, int y) {
Point p = convertFromScaled(x, y);
Layer l = getRootLayer();
if (l != null) {
return l.find(getLayoutContext(), p.x, p.y, false);
}
return null;
}
/**
* Force scale to use
*
* @param newScale The scale to use
* @throws IllegalArgumentException If newScale <= 0.0d.
*/
public void setScale(double newScale) throws IllegalArgumentException {
if (newScale <= 0.0d) throw new IllegalArgumentException("Only positive scales are allowed.");
this.scale = newScale;
scalePolicy = SCALE_POLICY_NONE;
lastLayoutSize = null;
repaint(getFixedRectangle());
scaleChanged();
}
public double getScale() {
return scale;
}
public void addScaleChangeListener(ScaleChangeListener scl) {
scListeners.add(scl);
}
public void removeScaleChangeListener(ScaleChangeListener scl) {
scListeners.remove(scl);
}
private void scaleChanged() {
ScaleChangeEvent evt = new ScaleChangeEvent(this, scale);
for (int i = 0; i < scListeners.size(); i++) {
ScaleChangeListener scl = (ScaleChangeListener) scListeners.get(i);
scl.scaleChanged(evt);
}
}
/**
* Renders according to scale factor
*
* @param c the RenderingContext to use
* @param root The Layer to render
*/
protected void doRender(RenderingContext c, Layer root) {
Graphics2D g = ((Java2DOutputDevice) c.getOutputDevice()).getGraphics();
if (!(g instanceof PrinterGraphics) && isOpaque()) {
g.setColor(getBackground());
g.fillRect(0, 0, getWidth(), getHeight());
}
AffineTransform current = g.getTransform();
PaintingInfo pI = root.getMaster().getPaintingInfo();
Dimension layoutSize = pI.getOuterMarginCorner();
calculateScaleAccordingToPolicy(layoutSize);
if (lastLayoutSize == null) {
lastLayoutSize = layoutSize;
setPreferredSize(new Dimension((int) (lastLayoutSize.width * scale), (int) (lastLayoutSize.height * scale)));
revalidate();
}
g.transform(AffineTransform.getScaleInstance(scale, scale));
super.doRender(c, root);
g.setTransform(current);
}
protected void calculateScaleAccordingToPolicy(Dimension layoutSize) {
Rectangle viewportBounds = getFixedRectangle();
if (getScalePolicy() == SCALE_POLICY_NONE) {
// FIXME: float comparison
if (scale == -1.0d) scale = 1.0d;
return;
}
double xScale, yScale;
if (viewportBounds.width < layoutSize.width) {
xScale = (double) viewportBounds.width / layoutSize.width;
} else {
xScale = 1.0d;
}
if (viewportBounds.height < layoutSize.height) {
yScale = (double) viewportBounds.height / layoutSize.height;
} else {
yScale = 1.0d;
}
if (getScalePolicy() == SCALE_POLICY_FIT_WIDTH) scale = xScale;
else if (getScalePolicy() == SCALE_POLICY_FIT_HEIGHT) scale = yScale;
else scale = Math.min(xScale, yScale);
}
protected Point convertToScaled(Point origin) {
if (scale <= 0.0d) return origin;
return new Point((int) (origin.x * scale), (int) (origin.y * scale));
}
protected Point convertFromScaled(Point origin) {
if (scale <= 0.0d) return origin;
return new Point((int) (origin.x / scale), (int) (origin.y / scale));
}
protected Point convertToScaled(int x, int y) {
if (scale <= 0.0d) return new Point(x, y);
return new Point((int) (x * scale), (int) (y * scale));
}
protected Point convertFromScaled(int x, int y) {
if (scale <= 0.0d) return new Point(x, y);
return new Point((int) (x / scale), (int) (y / scale));
}
public int getScalePolicy() {
return scalePolicy;
}
public void setScalePolicy(int scalePolicy) {
this.scalePolicy = scalePolicy;
lastLayoutSize = null;
repaint(getFixedRectangle());
}
}