/*
*
*
* Copyright 1990-2007 Sun Microsystems, Inc. All Rights Reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License version
* 2 only, as published by the Free Software Foundation.
*
* 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
* General Public License version 2 for more details (a copy is
* included at /legal/license.txt).
*
* You should have received a copy of the GNU General Public License
* version 2 along with this work; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA
*
* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa
* Clara, CA 95054 or visit www.sun.com if you need additional
* information or have any questions.
*/
package com.sun.perseus.model;
import com.sun.perseus.j2d.RenderContext;
import com.sun.perseus.j2d.RenderGraphics;
import java.io.InputStream;
import com.sun.perseus.util.RunnableQueue;
import com.sun.perseus.util.RunnableQueue.RunnableHandler;
import com.sun.perseus.j2d.RGB;
import com.sun.perseus.j2d.Transform;
/**
* <p>The <code>CanvasManager</code> class is responsible for
* keeping the rendering of a <code>ModelNode</code> tree on a
* <code>RenderGraphics</code> current.</p>
*
* <p>Specifically, the <code>CanvasManager</code> listens to
* update events in a <code>ModelNode</code> tree and
* triggers repaint into the <code>RenderGraphics</code> when
* necessary.</p>
*
* <p>The <code>CanvasManager</code> optimizes rendering
* of the tree while the document is in loading phase.</p>
*
* @version $Id: CanvasManager.java,v 1.17 2006/07/13 00:55:57 st125089 Exp $
*/
public class CanvasManager extends SimpleCanvasManager {
/**
* True while the component is processing a document
* which is in the loading phase, i.e., between
* the <code>UpdateListener</code>'s <code>loadStarting</code>
* and <code>loadComplete</code> calls.
*/
protected boolean loading;
/**
* Progressive painting is needed when a node has
* started loading and has been inserted into the tree.
* This is only used during the loading phase of
* a document when doing progressive rendering.
* The next node to paint progressively
*/
protected ModelNode progressiveNode = null;
/**
* Tracks the highest level node whose load completion
* is needed to proceed with progressive rendering.
* When loading this node completes, then the node
* is painted.
*/
protected ModelNode needLoadNode = null;
/**
* The associated SMILSampler, if animations are run.
*/
protected SMILSample sampler = null;
/**
* The rate for SMIL animation. The smilRate is the minimum time between
* SMIL samples.
*/
protected long smilRate = 40;
/**
* @param rg the <code>RenderGraphics</code> which this
* instance will keep up to date with the
* model changes.
* @param documentNode the <code>DocumentNode</code>, root of the
* tree that this <code>CanvasManager</code> will
* draw and keep current on the <code>RenderGraphics</code>
* @param canvasUpdateListener the <code>CanvasUpdateListener</code>
* which listens to completed updates on the associated
* <code>RenderGraphics</code>
*
* @throws IllegalArgumentException if rg, documentNode or listener is null.
*/
public CanvasManager(final RenderGraphics rg,
final DocumentNode documentNode,
final CanvasUpdateListener canvasUpdateListener) {
super(rg, documentNode, canvasUpdateListener);
}
/**
* Invoked when a node has been inserted into the tree
*
* @param node the newly inserted node
*/
public void nodeInserted(final ModelNode node) {
if (loading) {
if (needLoadNode == null) {
// Progressive rendering is _not_ suspended
// If this node's parent is already loaded,
// it means we are dealing with a node insertion
// resulting from reference resolution. We need
// to repaint the document in its current state.
if (node.parent.loaded) {
fullPaint();
} else {
// Check if this node suspends progressive
// rendering.
if (!node.getPaintNeedsLoad()) {
if (progressiveNode != null) {
needRepaint = true;
} else {
progressiveNode = node;
}
} else {
needLoadNode = node;
}
}
} else {
// Progressive rendering _is_ suspended
// We are loading a document and progressive
// repaint is disabled. However, the newly
// inserted node might be a ElementNodeProxy
// child of a Use element which is referencing
// content under the current needLoadNode.
// In that situation, we need to do a repaint
// of the document up to, but not including
// the needLoadNode.
ModelNode parent = node;
while (parent != null) {
if (parent == needLoadNode) {
// We are under the disabled node, no
// problem
break;
}
parent = parent.parent;
}
if (parent == null) {
// Re-render the document up to the current
// needLoadNode
needRepaint = true;
}
}
} else {
needRepaint = true;
}
}
/**
* @param node the node to test.
* @return true if <code>node</code> is
* a chid of the node currently holding up progressive
* rendering. The caller must make sure <code>needNodeLoad</code>
* is not null before calling this utility method. If called
* when <code>needLoadNode</code> is null, the method returns
* true.
*/
boolean isNeedLoadNodeOrChild(final ModelNode node) {
ModelNode parent = node;
while (parent != null) {
if (parent == needLoadNode) {
break;
}
parent = parent.parent;
}
if (parent == null) {
return false;
}
return true;
}
/**
* Invoked when a node is about to be modified.
*
* @param node the node which is about to be modified
*/
public void modifyingNode(final ModelNode node) {
if (!isNeedLoadNodeOrChild(node)
&&
((node.hasNodeRendering() || node.hasDescendants())
&& (node.canRenderState == 0))) {
needRepaint = true;
}
}
/**
* Invoked when a node modification completed.
*
* @param node the node which was just modified.
*/
public void modifiedNode(final ModelNode node) {
if (!loading) {
if (!needRepaint
&&
(node.hasNodeRendering()
||
node.hasDescendants())) {
needRepaint = true;
}
} else {
// Ignore modifications on nodes which have no
// rendering and no descendants
if (!node.hasNodeRendering() && !node.hasDescendants()) {
return;
}
// We are doing progressive rendering. Check if
// the modified node is the one currently suspended
// or one of its children.
// Modifications will be picked up when we
// paint the node after it has finished
// loading.
if (needLoadNode != null) {
if (node == needLoadNode) {
return;
} else {
ModelNode parent = node.parent;
while (parent != null) {
if (parent == needLoadNode) {
return;
}
parent = parent.parent;
}
needRepaint = true;
}
} else {
if (!needRepaint) {
// We modified a node which did not have node
// rendering.
if (progressiveNode != null && progressiveNode != node) {
needRepaint = true;
}
progressiveNode = node;
}
}
}
}
/**
* Invoked when the input node has finished loading.
*
* @param node the <code>node</code> for which loading
* is complete.
*/
public void loadComplete(final ModelNode node) {
// System.err.println(">>>>>>>>>>>>>> loadComplete : " + node);
if (node instanceof DocumentNode) {
// We are finished with the loading phase.
// Progressive rendering can stop
loading = false;
canvasUpdateListener.initialLoadComplete(null);
// At this point, we are ready to start the animation loop.
// We set the document's scheduled Runnable.
// IMPL NOTE : We disable animations if there are no initial animations.
// We should really only sample when there are
// active animations, but animations can be added by scripts, so
// we will need a more sophisticated mechanism.
if (documentNode.updateQueue != null
&&
documentNode.timeContainerRootSupport
.timedElementChildren.size() > 0) {
SMILSample.DocumentWallClock clock
= new SMILSample.DocumentWallClock(documentNode);
sampler
= new SMILSample(documentNode,
clock);
documentNode.updateQueue.scheduleAtFixedRate(sampler, this,
smilRate);
documentNode.timeContainerRootSupport.initialize();
clock.start();
}
} else if (node == needLoadNode) {
// We loaded a node fully. We can now display that
// node and its children and proceed with progressive
// rendering
if (progressiveNode != null) {
throw new Error();
}
progressiveNode = node;
needLoadNode = null;
}
updateCanvas();
}
/**
* Invoked when a document error happened before finishing loading.
*
* @param documentNode the <code>DocumentNode</code> for which loading
* has failed.
* @param error the exception which describes the reason why loading
* failed.
*/
public void loadingFailed(final DocumentNode documentNode,
final Exception error) {
loading = false;
canvasUpdateListener.initialLoadComplete(error);
}
/**
* Invoked when the document starts loading
*
* @param documentNode the <code>DocumentNode</code> for which loading
* is starting
* @param is the <code>InputStream</code> from which SVG content
* is loaded.
*/
public void loadStarting(final DocumentNode documentNode,
final InputStream is) {
loading = true;
}
/**
* Invoked when the input node has started loading
*
* @param node the <code>ModelNode</code> for which loading
* has started.
*/
public void loadBegun(final ModelNode node) {
updateCanvas();
}
/**
* Invoked when a string has been appended, during a load
* phase. This is only used when parsing a document and is
* used in support of progressive download, like the other
* loadXXX methods.
*
* @param node the <code>ModelNode</code> on which text has been
* inserted.
*/
public void textInserted(final ModelNode node) {
}
/**
* @return the associated SMILSampler, if animations are run.
*/
public SMILSample getSampler() {
return sampler;
}
/**
* Utility method used to update the canvas appropriately
* depending on what is needed.
*
* During the loading phase, while we do progressive
* rendering, the canvas will only redraw nodes in the
* progressiveNodes list, unless a repaint has been
* requested.
*
* Important Note: this method should only be called from
* the update thread, i.e., the thread that also manages
* the model node tree.
*/
public void updateCanvas() {
if (!loading) {
if (needRepaint) {
if (canvasConsumed) {
fullPaint();
needRepaint = false;
} else {
// There is a request to update the canvas
// (likely after a Runnable was invoked),
// but the last update was not consumed.
// If there is a Runnable in the RunnableQueue,
// we just skip this rendering update. Otherwise,
// schedule a fake Runnable to force a later repaint.
if (documentNode.getUpdateQueue().getSize() == 0) {
documentNode.getUpdateQueue()
.preemptLater(new Runnable() {
public void run() {
}
}, this);
}
}
}
} else {
if (needRepaint) {
// A full repaint was requested. If there is no
// suspended node, just do a full repaint.
// Otherwise, do a partial paint
if (needLoadNode == null) {
fullPaint();
} else {
partialPaint(documentNode);
canvasUpdateListener.updateComplete(this);
}
} else if (progressiveNode != null) {
progressivePaint(progressiveNode);
}
needRepaint = false;
progressiveNode = null;
}
}
/**
* Utility method invoked when an incremental painting is needed
* on a node. This may be invoked when a node was just inserted
* into the tree or when a node which required full loading of
* its children has been completely loaded.
*
* @param node the node to paint incrementally on the canvas
*/
protected void progressivePaint(final ModelNode node) {
// If this node already has children, we need to do a fullNodePaint.
// This happens for the <use> element when the <use> references
// an element which appeared before in the document.
if (node.hasDescendants()) {
fullNodePaint(node);
} else if (node.hasNodeRendering()
&& (node.canRenderState == 0)) {
synchronized (lock) {
if (!canvasConsumed) {
try {
lock.wait();
} catch (InterruptedException ie) {
}
}
node.paint(rg);
canvasConsumed = false;
canvasUpdateListener.updateComplete(this);
}
}
}
/**
* Utility method invoked when a node and its children need
* to be painted. This is used, for example, when a node
* which requires full loading before rendering is finally
* fully loaded.
*
* @param node the node to paint fully, i.e, including its
* children.
*/
protected void fullNodePaint(final ModelNode node) {
if (node.canRenderState == 0) {
synchronized (lock) {
if (!canvasConsumed) {
try {
lock.wait();
} catch (InterruptedException ie) {
}
}
node.paint(rg);
canvasConsumed = false;
canvasUpdateListener.updateComplete(this);
}
}
}
/**
* Utility method to paint the input tree up to, but not
* including the needLoadNode. This is a recursive method
* which should be called with the root of the tree to
* be painted.
*
* @param node the node to paint next.
*/
protected void partialPaint(final ModelNode node) {
if (node == needLoadNode
||
(node.canRenderState != 0)) {
return;
}
if (node.hasNodeRendering()) {
synchronized (lock) {
node.paint(rg);
}
} else {
ModelNode child = node.getFirstExpandedChild();
while (child != null) {
partialPaint(child);
child = child.nextSibling;
}
child = node.getFirstChildNode();
while (child != null) {
partialPaint(child);
child = child.nextSibling;
}
}
}
}
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