Source Code Cross Referenced for ElementNodeProxy.java in  » 6.0-JDK-Modules » j2me » com » sun » perseus » model » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » 6.0 JDK Modules » j2me » com.sun.perseus.model 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         *
003:         *
004:         * Copyright  1990-2007 Sun Microsystems, Inc. All Rights Reserved.
005:         * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER
006:         * 
007:         * This program is free software; you can redistribute it and/or
008:         * modify it under the terms of the GNU General Public License version
009:         * 2 only, as published by the Free Software Foundation.
010:         * 
011:         * This program is distributed in the hope that it will be useful, but
012:         * WITHOUT ANY WARRANTY; without even the implied warranty of
013:         * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
014:         * General Public License version 2 for more details (a copy is
015:         * included at /legal/license.txt).
016:         * 
017:         * You should have received a copy of the GNU General Public License
018:         * version 2 along with this work; if not, write to the Free Software
019:         * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
020:         * 02110-1301 USA
021:         * 
022:         * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa
023:         * Clara, CA 95054 or visit www.sun.com if you need additional
024:         * information or have any questions.
025:         */
026:        package com.sun.perseus.model;
027:
028:        import com.sun.perseus.j2d.RenderGraphics;
029:
030:        import com.sun.perseus.j2d.Box;
031:        import com.sun.perseus.j2d.Tile;
032:        import com.sun.perseus.j2d.Transform;
033:
034:        /**
035:         * A <code>ElementNodeProxy</code> delegates its rendering to a 
036:         * proxied <code>ElementNode</code> object. This class is used to 
037:         * model expanded content. SVG markup defines content that needs to 
038:         * be expanded before it is rendered. For example, the <code>&lt;use&gt;</code>
039:         * element is expanded with <code>ElementNodeProxy</code> children 
040:         * to represent the expansion expressed by the element. 
041:         *
042:         * @version $Id: ElementNodeProxy.java,v 1.14 2006/06/29 10:47:30 ln156897 Exp $
043:         */
044:        public class ElementNodeProxy extends ModelNode {
045:            /**
046:             * The proxied ModelNode
047:             */
048:            protected ElementNode proxied;
049:
050:            /**
051:             * Controls whether content is expanded or not
052:             */
053:            protected boolean expanded;
054:
055:            /**
056:             * The next proxy, if any.
057:             */
058:            protected ElementNodeProxy nextProxy;
059:
060:            /**
061:             * The previous proxy, if any.
062:             */
063:            protected ElementNodeProxy prevProxy;
064:
065:            /**
066:             * The first expanded child, if content has been expanded.
067:             */
068:            protected ModelNode firstExpandedChild;
069:
070:            /**
071:             * The last expanded child, if content has been expanded
072:             */
073:            protected ModelNode lastExpandedChild;
074:
075:            /**
076:             * @param proxiedNode <tt>ElementNode</tt> to proxy
077:             */
078:            protected ElementNodeProxy(final ElementNode proxiedNode) {
079:                super ();
080:                this .proxied = proxiedNode;
081:                proxiedNode.addProxy(this );
082:                ownerDocument = proxiedNode.ownerDocument;
083:            }
084:
085:            /**
086:             * When a CompositeNode is hooked into the document tree, by default,
087:             * it notifies its children and calls its own nodeHookedInDocumentTree
088:             * method.
089:             */
090:            final void onHookedInDocumentTree() {
091:                super .onHookedInDocumentTree();
092:
093:                ModelNode c = firstExpandedChild;
094:                while (c != null) {
095:                    c.onHookedInDocumentTree();
096:                    c = c.nextSibling;
097:                }
098:            }
099:
100:            /**
101:             * Clears the text layouts, if any exist. This is typically
102:             * called when the font selection has changed and nodes such
103:             * as <code>Text</code> should recompute their layouts.
104:             * This should recursively call clearLayouts on children 
105:             * node or expanded content, if any.
106:             */
107:            protected void clearLayouts() {
108:                clearLayouts(firstExpandedChild);
109:            }
110:
111:            /**
112:             * @return a reference to the node's first child, or null if there
113:             *         are no children.
114:             */
115:            public ModelNode getFirstChildNode() {
116:                return null;
117:            }
118:
119:            /**
120:             * @return a reference to the node's last child, or null if there
121:             *         are no children.
122:             */
123:            public ModelNode getLastChildNode() {
124:                return null;
125:            }
126:
127:            /**
128:             * Does nothing, as there are no children.
129:             */
130:            protected void unhookChildrenQuiet() {
131:            }
132:
133:            /**
134:             * Some node types (such as <code>ElementNodeProxy</code>) have
135:             * expanded children that they compute in some specific
136:             * way depending on the implementation.     
137:             *
138:             * @return a reference to the node's first expanded child, or null if there
139:             *         are no expanded children. This forces the computation of expanded
140:             *         content if needed.
141:             */
142:            public ModelNode getFirstExpandedChild() {
143:                expand();
144:                return firstExpandedChild;
145:            }
146:
147:            /**
148:             * Some node types (such as <code>ElementNodeProxy</code>) have
149:             * expanded children that they compute in some specific
150:             * way depending on the implementation.     
151:             *
152:             * @return a reference to the node's first expanded child, or null if there
153:             *         are no expanded children. 
154:             */
155:            public ModelNode getFirstComputedExpandedChild() {
156:                return firstExpandedChild;
157:            }
158:
159:            /**
160:             * Some node types (such as <code>ElementNodeProxy</code>) have
161:             * expanded children that they compute in some specific
162:             * way depending on the implementation.     
163:             *
164:             * @return a reference to the node's last expanded child, or null if there
165:             *         are no expanded children. This forces the computation of expanded
166:             *         content if needed.
167:             */
168:            public ModelNode getLastExpandedChild() {
169:                expand();
170:                return lastExpandedChild;
171:            }
172:
173:            /**
174:             * Utility method. Unhooks the expanded content.
175:             */
176:            protected void unhookExpandedQuiet() {
177:                unhookQuiet(firstExpandedChild);
178:                firstExpandedChild = null;
179:                lastExpandedChild = null;
180:                expanded = false;
181:            }
182:
183:            /**
184:             * @return true if the ElementNodeProxy has children or if it has
185:             *         expanded content.
186:             */
187:            public boolean hasDescendants() {
188:                if (super .hasDescendants()) {
189:                    return true;
190:                } else {
191:                    expand();
192:                    return firstExpandedChild != null;
193:                }
194:
195:            }
196:
197:            /**
198:             * Returns the <code>ModelNode</code>, if any, hit by the
199:             * point at coordinate x/y. 
200:             * 
201:             * @param pt the x/y coordinate. Should never be null and be
202:             *        of size two. If not, the behavior is unspecified.
203:             *        The coordinates are in viewport space.
204:             * @return the <tt>ModelNode</tt> hit at the given point or null
205:             *         if none was hit.
206:             */
207:            public ModelNode nodeHitAt(final float[] pt) {
208:                return proxied.proxyNodeHitAt(pt, this );
209:            }
210:
211:            /**
212:             * Appends the proxied node's transform, if there is a proxied node.
213:             *
214:             * @param tx the <code>Transform</code> to apply additional node 
215:             *        transforms to. This may be null.
216:             * @param workTx a <code>Transform</code> which can be re-used if a 
217:             *        new <code>Transform</code> needs to be created and workTx
218:             *        is not the same instance as tx.
219:             * @return a transform with this node's transform added.
220:             */
221:            protected Transform appendTransform(Transform tx,
222:                    final Transform workTx) {
223:                if (proxied != null) {
224:                    return proxied.appendTransform(tx, workTx);
225:                }
226:
227:                return tx;
228:            }
229:
230:            /**
231:             * @return a reference to the proxied <code>ModelNode</code>
232:             */
233:            public ElementNode getProxied() {
234:                return proxied;
235:            }
236:
237:            /**
238:             * Modifies the node proxied by this proxy.
239:             *
240:             * @param newProxied this node's new proxied node
241:             */
242:            protected void setProxied(final ElementNode newProxied) {
243:                if (this .proxied == newProxied) {
244:                    return;
245:                }
246:
247:                // We call modifyingNode because this node's rendering
248:                // may change as a result of changing the proxy.
249:                modifyingNode();
250:
251:                if (this .proxied != null) {
252:                    this .proxied.removeProxy(this );
253:                }
254:
255:                unhookQuiet(firstExpandedChild);
256:
257:                this .proxied = newProxied;
258:                firstExpandedChild = null;
259:                lastExpandedChild = null;
260:                expanded = false;
261:
262:                if (newProxied != null) {
263:                    newProxied.addProxy(this );
264:                }
265:
266:                // Initialize the requiredFeatures/requiredExtensions/systemLanguage
267:                // bits to the same value as the proxied node.
268:                int oldCanRenderState = canRenderState;
269:                canRenderState &= CAN_RENDER_REQUIRED_FEATURES_MASK;
270:                canRenderState &= CAN_RENDER_REQUIRED_EXTENSIONS_MASK;
271:                canRenderState &= CAN_RENDER_SYSTEM_LANGUAGE_MASK;
272:
273:                if (newProxied != null) {
274:                    canRenderState |= (newProxied.canRenderState & CAN_RENDER_REQUIRED_FEATURES_BIT);
275:                    canRenderState |= (newProxied.canRenderState & CAN_RENDER_REQUIRED_EXTENSIONS_BIT);
276:                    canRenderState |= (newProxied.canRenderState & CAN_RENDER_SYSTEM_LANGUAGE_BIT);
277:                }
278:
279:                propagateCanRenderState(oldCanRenderState, canRenderState);
280:
281:                // We call modifiedNode because this node's rendering
282:                // may have changed as a result of changing the proxy.
283:                modifiedNode();
284:            }
285:
286:            /**
287:             * Expand the content. This is done lazilly
288:             */
289:            protected void expand() {
290:                if (expanded) {
291:                    return;
292:                }
293:
294:                // Expand proxy tree. 
295:                //
296:                // NOTE: This implements the SVGElementInstance tree structure,
297:                // as described in the SVG 1.1 specification, section 5.17.
298:                //
299:                if (proxied != null) {
300:                    firstExpandedChild = computeProxiesChain((ElementNode) proxied
301:                            .getFirstChildNode());
302:
303:                    if (firstExpandedChild != null) {
304:                        lastExpandedChild = firstExpandedChild.prevSibling;
305:
306:                        // The prevSibling was set as a way to return both the first
307:                        // and last element of the chain. We need to break the circular
308:                        // reference.
309:                        firstExpandedChild.prevSibling = null;
310:                    } else {
311:                        firstExpandedChild = null;
312:                    }
313:                }
314:
315:                expanded = true;
316:            }
317:
318:            /**
319:             * Proxied nodes should call this method when they are being modified.
320:             */
321:            public void modifyingProxied() {
322:                modifyingNode();
323:            }
324:
325:            /**
326:             * Proxied nodes should call this method when they have been modified.
327:             */
328:            public void modifiedProxied() {
329:                modifiedNode();
330:            }
331:
332:            /**
333:             * Proxied nodes should call this method they got a new added child.
334:             * This is an optimization of the more generic insertion
335:             * case. Appending a child is a recursive process which avoids
336:             * recomputing all the proxies recursively (a proxy referencing a proxy
337:             * referencing a proxy .... referencing a composite on which nodes are
338:             * appended). It might be advantageous to consider doing a generic 
339:             * optimized insertion into the children list.
340:             *
341:             * @param child the <code>ElementNode</code> which was just added under
342:             *        the proxied node.
343:             * @see #proxiedExpandedChildAdded
344:             */
345:            public void proxiedChildAdded(final ElementNode child) {
346:                // If this node is not expanded at all, expand it now
347:                if (!expanded) {
348:                    expand();
349:                } else {
350:                    ElementNodeProxy newChildProxy = child.buildProxy();
351:
352:                    if (firstExpandedChild == null) {
353:                        firstExpandedChild = newChildProxy;
354:                        lastExpandedChild = newChildProxy;
355:                        newChildProxy.nextSibling = null;
356:                        newChildProxy.prevSibling = null;
357:                    } else {
358:                        lastExpandedChild.nextSibling = newChildProxy;
359:                        newChildProxy.nextSibling = null;
360:                        newChildProxy.prevSibling = lastExpandedChild;
361:                        lastExpandedChild = newChildProxy;
362:                    }
363:
364:                    newChildProxy.setParentQuiet(this );
365:                    newChildProxy.expand();
366:                    nodeInserted(newChildProxy);
367:                }
368:            }
369:
370:            /**
371:             * Implementation helper: computes the set of chained proxies
372:             * for the input node and return the head of the chain.
373:             *
374:             * @param proxiedChild the <code>ElementNode</code> for which the chain of 
375:             *        proxies should be computed.
376:             *
377:             * @return the head of the proxies chaing. <b>NOTE</b> that the prevSibling
378:             *         is set on the head to point to the last element of the chain,
379:             *         creating a circular list for the 'prevSibling' reference. This
380:             *         circular reference should be broken by the code using this 
381:             *         method.
382:             */
383:            protected ElementNodeProxy computeProxiesChain(
384:                    ElementNode proxiedChild) {
385:                ElementNodeProxy firstProxy = null;
386:                ElementNodeProxy proxy = null;
387:                ElementNodeProxy previousProxy = null;
388:                while (proxiedChild != null) {
389:                    proxy = proxiedChild.buildProxy();
390:                    proxy.setParentQuiet(this );
391:                    proxy.expand();
392:                    if (previousProxy == null) {
393:                        firstProxy = proxy;
394:                    } else {
395:                        previousProxy.nextSibling = proxy;
396:                        proxy.prevSibling = previousProxy;
397:                    }
398:                    firstProxy.prevSibling = proxy;
399:                    previousProxy = proxy;
400:                    proxiedChild = (ElementNode) proxiedChild.nextSibling;
401:                }
402:                return firstProxy;
403:            }
404:
405:        }
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