Source Code Cross Referenced for RowPeer.java in  » Ajax » NextApp-Echo2 » nextapp » echo2 » webcontainer » syncpeer » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Ajax » NextApp Echo2 » nextapp.echo2.webcontainer.syncpeer 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /* 
002:         * This file is part of the Echo Web Application Framework (hereinafter "Echo").
003:         * Copyright (C) 2002-2005 NextApp, Inc.
004:         *
005:         * Version: MPL 1.1/GPL 2.0/LGPL 2.1
006:         *
007:         * The contents of this file are subject to the Mozilla Public License Version
008:         * 1.1 (the "License"); you may not use this file except in compliance with
009:         * the License. You may obtain a copy of the License at
010:         * http://www.mozilla.org/MPL/
011:         *
012:         * Software distributed under the License is distributed on an "AS IS" basis,
013:         * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
014:         * for the specific language governing rights and limitations under the
015:         * License.
016:         *
017:         * Alternatively, the contents of this file may be used under the terms of
018:         * either the GNU General Public License Version 2 or later (the "GPL"), or
019:         * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
020:         * in which case the provisions of the GPL or the LGPL are applicable instead
021:         * of those above. If you wish to allow use of your version of this file only
022:         * under the terms of either the GPL or the LGPL, and not to allow others to
023:         * use your version of this file under the terms of the MPL, indicate your
024:         * decision by deleting the provisions above and replace them with the notice
025:         * and other provisions required by the GPL or the LGPL. If you do not delete
026:         * the provisions above, a recipient may use your version of this file under
027:         * the terms of any one of the MPL, the GPL or the LGPL.
028:         */
029:
030:        package nextapp.echo2.webcontainer.syncpeer;
031:
032:        import org.w3c.dom.Document;
033:        import org.w3c.dom.DocumentFragment;
034:        import org.w3c.dom.Element;
035:        import org.w3c.dom.Node;
036:
037:        import nextapp.echo2.app.Alignment;
038:        import nextapp.echo2.app.Border;
039:        import nextapp.echo2.app.Color;
040:        import nextapp.echo2.app.Component;
041:        import nextapp.echo2.app.Extent;
042:        import nextapp.echo2.app.Font;
043:        import nextapp.echo2.app.ImageReference;
044:        import nextapp.echo2.app.Insets;
045:        import nextapp.echo2.app.Row;
046:        import nextapp.echo2.app.LayoutData;
047:        import nextapp.echo2.app.layout.RowLayoutData;
048:        import nextapp.echo2.app.update.ServerComponentUpdate;
049:        import nextapp.echo2.webcontainer.ContainerInstance;
050:        import nextapp.echo2.webcontainer.DomUpdateSupport;
051:        import nextapp.echo2.webcontainer.PartialUpdateManager;
052:        import nextapp.echo2.webcontainer.RenderContext;
053:        import nextapp.echo2.webcontainer.RenderState;
054:        import nextapp.echo2.webcontainer.ComponentSynchronizePeer;
055:        import nextapp.echo2.webcontainer.SynchronizePeerFactory;
056:        import nextapp.echo2.webcontainer.image.ImageRenderSupport;
057:        import nextapp.echo2.webcontainer.partialupdate.BorderUpdate;
058:        import nextapp.echo2.webcontainer.partialupdate.ColorUpdate;
059:        import nextapp.echo2.webcontainer.partialupdate.InsetsUpdate;
060:        import nextapp.echo2.webcontainer.propertyrender.AlignmentRender;
061:        import nextapp.echo2.webcontainer.propertyrender.BorderRender;
062:        import nextapp.echo2.webcontainer.propertyrender.CellLayoutDataRender;
063:        import nextapp.echo2.webcontainer.propertyrender.ColorRender;
064:        import nextapp.echo2.webcontainer.propertyrender.ExtentRender;
065:        import nextapp.echo2.webcontainer.propertyrender.FontRender;
066:        import nextapp.echo2.webcontainer.propertyrender.InsetsRender;
067:        import nextapp.echo2.webrender.output.CssStyle;
068:        import nextapp.echo2.webrender.servermessage.DomUpdate;
069:
070:        /**
071:         * Synchronization peer for <code>nextapp.echo2.app.Row</code> components.
072:         * <p>
073:         * This class should not be extended or used by classes outside of the
074:         * Echo framework.
075:         */
076:        public class RowPeer implements  ComponentSynchronizePeer,
077:                DomUpdateSupport, ImageRenderSupport {
078:
079:            /**
080:             * <code>RenderState</code> implementation.
081:             */
082:            private static class RowPeerRenderState implements  RenderState {
083:
084:                /**
085:                 * The child <code>Component</code> which had the highest index during 
086:                 * the last rendering.  This information is necessary when rendering 
087:                 * cell spacing, as the last component will not have a "spacing" row
088:                 * beneath it.  Thus, if it is no longer the last component due to an
089:                 * add, one will need to be added beneath it. 
090:                 */
091:                public Component lastChild;
092:            }
093:
094:            private PartialUpdateManager partialUpdateManager;
095:
096:            /**
097:             * Default constructor.
098:             */
099:            public RowPeer() {
100:                partialUpdateManager = new PartialUpdateManager();
101:                partialUpdateManager.add(Row.PROPERTY_BORDER, new BorderUpdate(
102:                        Row.PROPERTY_BORDER, null, BorderUpdate.CSS_BORDER));
103:                partialUpdateManager.add(Row.PROPERTY_FOREGROUND,
104:                        new ColorUpdate(Row.PROPERTY_FOREGROUND, null,
105:                                ColorUpdate.CSS_COLOR));
106:                partialUpdateManager.add(Row.PROPERTY_BACKGROUND,
107:                        new ColorUpdate(Row.PROPERTY_BACKGROUND, null,
108:                                ColorUpdate.CSS_BACKGROUND_COLOR));
109:                partialUpdateManager.add(Row.PROPERTY_INSETS, new InsetsUpdate(
110:                        Row.PROPERTY_INSETS, null, InsetsUpdate.CSS_PADDING));
111:            }
112:
113:            /**
114:             * @see nextapp.echo2.webcontainer.ComponentSynchronizePeer#getContainerId(nextapp.echo2.app.Component)
115:             */
116:            public String getContainerId(Component child) {
117:                return ContainerInstance.getElementId(child.getParent())
118:                        + "_cell_" + ContainerInstance.getElementId(child);
119:            }
120:
121:            /**
122:             * @see nextapp.echo2.webcontainer.image.ImageRenderSupport#getImage(nextapp.echo2.app.Component, java.lang.String)
123:             */
124:            public ImageReference getImage(Component component, String imageId) {
125:                // Only source of ImageReferences from this component are CellLayoutData background images:
126:                // Delegate work to CellLayoutDataRender convenience method.
127:                return CellLayoutDataRender.getCellLayoutDataBackgroundImage(
128:                        component, imageId);
129:            }
130:
131:            /**
132:             * Returns the <code>RowLayoutData</code> of the given child, or null if
133:             * it does not provide layout data.
134:             * 
135:             * @param child the child component
136:             * @return the layout data
137:             * @throws java.lang.RuntimeException if the the provided
138:             *         <code>LayoutData</code> is not a <code>RowLayoutData</code>
139:             */
140:            private RowLayoutData getLayoutData(Component child) {
141:                LayoutData layoutData = (LayoutData) child
142:                        .getRenderProperty(Component.PROPERTY_LAYOUT_DATA);
143:                if (layoutData == null) {
144:                    return null;
145:                } else if (layoutData instanceof  RowLayoutData) {
146:                    return (RowLayoutData) layoutData;
147:                } else {
148:                    throw new RuntimeException(
149:                            "Invalid LayoutData for Row Child: "
150:                                    + layoutData.getClass().getName());
151:                }
152:            }
153:
154:            /**
155:             * @see nextapp.echo2.webcontainer.ComponentSynchronizePeer#renderAdd(nextapp.echo2.webcontainer.RenderContext, 
156:             *      nextapp.echo2.app.update.ServerComponentUpdate, java.lang.String, nextapp.echo2.app.Component)
157:             */
158:            public void renderAdd(RenderContext rc,
159:                    ServerComponentUpdate update, String targetId,
160:                    Component component) {
161:                Element domAddElement = DomUpdate.renderElementAdd(rc
162:                        .getServerMessage());
163:                DocumentFragment htmlFragment = rc.getServerMessage()
164:                        .getDocument().createDocumentFragment();
165:                renderHtml(rc, update, htmlFragment, component);
166:                DomUpdate.renderElementAddContent(rc.getServerMessage(),
167:                        domAddElement, targetId, htmlFragment);
168:            }
169:
170:            /**
171:             * Renders a child component.
172:             * 
173:             * @param rc the relevant <code>RenderContext</code>
174:             * @param update the update
175:             * @param parentElement the HTML element which should contain the child
176:             * @param child the child component to render
177:             */
178:            private void renderAddChild(RenderContext rc,
179:                    ServerComponentUpdate update, Element parentElement,
180:                    Component child) {
181:                ComponentSynchronizePeer syncPeer = SynchronizePeerFactory
182:                        .getPeerForComponent(child.getClass());
183:                if (syncPeer instanceof  DomUpdateSupport) {
184:                    ((DomUpdateSupport) syncPeer).renderHtml(rc, update,
185:                            parentElement, child);
186:                } else {
187:                    syncPeer
188:                            .renderAdd(rc, update, getContainerId(child), child);
189:                }
190:            }
191:
192:            /**
193:             * Renders child components which were added to a <code>Row</code>, as 
194:             * described in the provided <code>ServerComponentUpdate</code>.
195:             * 
196:             * @param rc the relevant <code>RenderContext</code>
197:             * @param update the update
198:             */
199:            private void renderAddChildren(RenderContext rc,
200:                    ServerComponentUpdate update) {
201:                Element domAddElement = DomUpdate.renderElementAdd(rc
202:                        .getServerMessage());
203:                Row row = (Row) update.getParent();
204:                String elementId = ContainerInstance.getElementId(row);
205:                String trElementId = elementId + "_tr";
206:
207:                Component[] components = update.getParent()
208:                        .getVisibleComponents();
209:                Component[] addedChildren = update.getAddedChildren();
210:
211:                for (int componentIndex = components.length - 1; componentIndex >= 0; --componentIndex) {
212:                    boolean childFound = false;
213:                    for (int addedChildrenIndex = 0; !childFound
214:                            && addedChildrenIndex < addedChildren.length; ++addedChildrenIndex) {
215:                        if (addedChildren[addedChildrenIndex] == components[componentIndex]) {
216:                            DocumentFragment htmlFragment = rc
217:                                    .getServerMessage().getDocument()
218:                                    .createDocumentFragment();
219:                            renderChild(rc, update, htmlFragment, row,
220:                                    components[componentIndex]);
221:                            if (componentIndex == components.length - 1) {
222:                                DomUpdate.renderElementAddContent(rc
223:                                        .getServerMessage(), domAddElement,
224:                                        trElementId, htmlFragment);
225:                            } else {
226:                                DomUpdate
227:                                        .renderElementAddContent(
228:                                                rc.getServerMessage(),
229:                                                domAddElement,
230:                                                trElementId,
231:                                                elementId
232:                                                        + "_cell_"
233:                                                        + ContainerInstance
234:                                                                .getElementId(components[componentIndex + 1]),
235:                                                htmlFragment);
236:                            }
237:                            childFound = true;
238:                        }
239:                    }
240:                }
241:
242:                // Special case: Recall the child which was rendered at the last index of the row on the previous
243:                // rendering.  If this child is still present but is no longer at the last index, render a spacing
244:                // cell after it (if necessary).
245:                RowPeerRenderState renderState = (RowPeerRenderState) rc
246:                        .getContainerInstance().getRenderState(row);
247:                if (renderState != null && renderState.lastChild != null) {
248:                    int previousLastChildIndex = row
249:                            .visibleIndexOf(renderState.lastChild);
250:                    if (previousLastChildIndex != -1
251:                            && previousLastChildIndex != row
252:                                    .getVisibleComponentCount() - 1) {
253:                        // At this point it is known that the child which was previously last is present, but is no longer last.
254:
255:                        // In the event the child was removed and re-added, the special case is unnecessary.
256:                        boolean lastChildMoved = false;
257:                        for (int i = 0; i < addedChildren.length; ++i) {
258:                            if (renderState.lastChild == addedChildren[i]) {
259:                                lastChildMoved = true;
260:                            }
261:                        }
262:                        if (!lastChildMoved) {
263:                            DocumentFragment htmlFragment = rc
264:                                    .getServerMessage().getDocument()
265:                                    .createDocumentFragment();
266:                            renderSpacingCell(htmlFragment, row,
267:                                    renderState.lastChild);
268:                            DomUpdate
269:                                    .renderElementAddContent(
270:                                            rc.getServerMessage(),
271:                                            domAddElement,
272:                                            trElementId,
273:                                            elementId
274:                                                    + "_cell_"
275:                                                    + ContainerInstance
276:                                                            .getElementId(components[previousLastChildIndex + 1]),
277:                                            htmlFragment);
278:                        }
279:                    }
280:                }
281:            }
282:
283:            /**
284:             * Renders an individual child component of the <code>Row</code>.
285:             * 
286:             * @param rc the relevant <code>RenderContext</code>
287:             * @param update the <code>ServerComponentUpdate</code> being performed
288:             * @param parentNode the containing node to which the child should be 
289:             *        appended
290:             * @param child The child <code>Component</code> to be rendered
291:             */
292:            private void renderChild(RenderContext rc,
293:                    ServerComponentUpdate update, Node parentNode,
294:                    Component component, Component child) {
295:                Document document = parentNode.getOwnerDocument();
296:                String childId = ContainerInstance.getElementId(child);
297:                Element tdElement = document.createElement("td");
298:                String cellId = ContainerInstance.getElementId(component)
299:                        + "_cell_" + childId;
300:                tdElement.setAttribute("id", cellId);
301:
302:                // Configure cell style.
303:                CssStyle cssStyle = new CssStyle();
304:                RowLayoutData layoutData = getLayoutData(child);
305:                CellLayoutDataRender.renderToElementAndStyle(tdElement,
306:                        cssStyle, child, layoutData, "0px");
307:                CellLayoutDataRender.renderBackgroundImageToStyle(cssStyle, rc,
308:                        this , component, child);
309:                if (layoutData != null) {
310:                    ExtentRender.renderToStyle(cssStyle, "width", layoutData
311:                            .getWidth());
312:                }
313:                tdElement.setAttribute("style", cssStyle.renderInline());
314:
315:                parentNode.appendChild(tdElement);
316:
317:                renderSpacingCell(parentNode, (Row) component, child);
318:
319:                renderAddChild(rc, update, tdElement, child);
320:            }
321:
322:            /**
323:             * @see nextapp.echo2.webcontainer.ComponentSynchronizePeer#renderDispose(nextapp.echo2.webcontainer.RenderContext, 
324:             *      nextapp.echo2.app.update.ServerComponentUpdate, nextapp.echo2.app.Component)
325:             */
326:            public void renderDispose(RenderContext rc,
327:                    ServerComponentUpdate update, Component component) {
328:            }
329:
330:            /**
331:             * @see nextapp.echo2.webcontainer.DomUpdateSupport#renderHtml(nextapp.echo2.webcontainer.RenderContext, 
332:             *      nextapp.echo2.app.update.ServerComponentUpdate, org.w3c.dom.Node, nextapp.echo2.app.Component)
333:             */
334:            public void renderHtml(RenderContext rc,
335:                    ServerComponentUpdate update, Node parentNode,
336:                    Component component) {
337:                Row row = (Row) component;
338:                Border border = (Border) row
339:                        .getRenderProperty(Row.PROPERTY_BORDER);
340:                String elementId = ContainerInstance.getElementId(row);
341:                Document document = parentNode.getOwnerDocument();
342:
343:                Element divElement = document.createElement("div");
344:                divElement.setAttribute("id", elementId);
345:                parentNode.appendChild(divElement);
346:
347:                CssStyle divCssStyle = new CssStyle();
348:                BorderRender.renderToStyle(divCssStyle, border);
349:                ColorRender.renderToStyle(divCssStyle, (Color) row
350:                        .getRenderProperty(Row.PROPERTY_FOREGROUND),
351:                        (Color) row.getRenderProperty(Row.PROPERTY_BACKGROUND));
352:                FontRender.renderToStyle(divCssStyle, (Font) row
353:                        .getRenderProperty(Row.PROPERTY_FONT));
354:                Insets insets = (Insets) row
355:                        .getRenderProperty(Row.PROPERTY_INSETS);
356:                if (insets == null) {
357:                    divCssStyle.setAttribute("padding", "0px");
358:                } else {
359:                    InsetsRender.renderToStyle(divCssStyle, "padding", insets);
360:                }
361:                divElement.setAttribute("style", divCssStyle.renderInline());
362:
363:                Element tableElement = document.createElement("table");
364:                tableElement.setAttribute("id", elementId + "_table");
365:                tableElement.setAttribute("style",
366:                        "padding:0px;border-collapse:collapse;");
367:
368:                AlignmentRender.renderToElement(divElement, ((Alignment) row
369:                        .getRenderProperty(Row.PROPERTY_ALIGNMENT)), row);
370:
371:                divElement.appendChild(tableElement);
372:
373:                Element tbodyElement = document.createElement("tbody");
374:                tbodyElement.setAttribute("id", elementId + "_tbody");
375:                tableElement.appendChild(tbodyElement);
376:
377:                Element trElement = document.createElement("tr");
378:                trElement.setAttribute("id", elementId + "_tr");
379:                tbodyElement.appendChild(trElement);
380:
381:                Component[] children = row.getVisibleComponents();
382:                for (int i = 0; i < children.length; ++i) {
383:                    renderChild(rc, update, trElement, component, children[i]);
384:                }
385:
386:                storeRenderState(rc, row);
387:            }
388:
389:            /**
390:             * Renders removal operations for child components which were removed from 
391:             * a <code>Row</code>, as described in the provided 
392:             * <code>ServerComponentUpdate</code>.
393:             * 
394:             * @param rc the relevant <code>RenderContext</code>
395:             * @param update the update
396:             */
397:            private void renderRemoveChildren(RenderContext rc,
398:                    ServerComponentUpdate update) {
399:                Component[] removedChildren = update.getRemovedChildren();
400:                Component parent = update.getParent();
401:                String parentId = ContainerInstance.getElementId(parent);
402:                for (int i = 0; i < removedChildren.length; ++i) {
403:                    String childId = ContainerInstance
404:                            .getElementId(removedChildren[i]);
405:                    DomUpdate.renderElementRemove(rc.getServerMessage(),
406:                            parentId + "_cell_" + childId);
407:                    DomUpdate.renderElementRemove(rc.getServerMessage(),
408:                            parentId + "_spacing_" + childId);
409:                }
410:
411:                int componentCount = parent.getVisibleComponentCount();
412:                if (componentCount > 0) {
413:                    DomUpdate
414:                            .renderElementRemove(
415:                                    rc.getServerMessage(),
416:                                    parentId
417:                                            + "_spacing_"
418:                                            + ContainerInstance
419:                                                    .getElementId(parent
420:                                                            .getVisibleComponent(componentCount - 1)));
421:                }
422:            }
423:
424:            /**
425:             * Renders a "spacing cell" beneath a row cell to provide
426:             * cell spacing.
427:             * 
428:             * @param parentNode the containing node to which the child
429:             *        should be appended
430:             * @param row the <code>Row</code> being updated
431:             * @param child the child preceeding the spacing row
432:             */
433:            private void renderSpacingCell(Node parentNode, Row row,
434:                    Component child) {
435:                Extent cellSpacing = (Extent) row
436:                        .getRenderProperty(Row.PROPERTY_CELL_SPACING);
437:                if (!ExtentRender.isZeroLength(cellSpacing)
438:                        && row.visibleIndexOf(child) != row
439:                                .getVisibleComponentCount() - 1) {
440:                    Element spacingElement = parentNode.getOwnerDocument()
441:                            .createElement("td");
442:                    spacingElement.setAttribute("id", ContainerInstance
443:                            .getElementId(row)
444:                            + "_spacing_"
445:                            + ContainerInstance.getElementId(child));
446:                    CssStyle spacingCssStyle = new CssStyle();
447:                    spacingCssStyle.setAttribute("width", ExtentRender
448:                            .renderCssAttributeValue(cellSpacing));
449:                    spacingCssStyle.setAttribute("font-size", "1px");
450:                    spacingCssStyle.setAttribute("line-height", "0px");
451:                    spacingElement.setAttribute("style", spacingCssStyle
452:                            .renderInline());
453:                    parentNode.appendChild(spacingElement);
454:                }
455:            }
456:
457:            /**
458:             * @see nextapp.echo2.webcontainer.ComponentSynchronizePeer#renderUpdate(nextapp.echo2.webcontainer.RenderContext, 
459:             *      nextapp.echo2.app.update.ServerComponentUpdate, java.lang.String)
460:             */
461:            public boolean renderUpdate(RenderContext rc,
462:                    ServerComponentUpdate update, String targetId) {
463:                // Determine if fully replacing the component is required.
464:                boolean fullReplace = false;
465:                if (update.hasUpdatedLayoutDataChildren()) {
466:                    // TODO: Perform fractional update on LayoutData change instead of full replace.
467:                    fullReplace = true;
468:                } else if (update.hasUpdatedProperties()) {
469:                    if (!partialUpdateManager.canProcess(rc, update)) {
470:                        fullReplace = true;
471:                    }
472:                }
473:
474:                if (fullReplace) {
475:                    // Perform full update.
476:                    DomUpdate.renderElementRemove(rc.getServerMessage(),
477:                            ContainerInstance.getElementId(update.getParent()));
478:                    renderAdd(rc, update, targetId, update.getParent());
479:                } else {
480:                    // Perform incremental updates.
481:                    if (update.hasRemovedChildren()) {
482:                        renderRemoveChildren(rc, update);
483:                    }
484:                    if (update.hasUpdatedProperties()) {
485:                        partialUpdateManager.process(rc, update);
486:                    }
487:                    if (update.hasAddedChildren()) {
488:                        renderAddChildren(rc, update);
489:                    }
490:                }
491:
492:                storeRenderState(rc, update.getParent());
493:                return fullReplace;
494:            }
495:
496:            /**
497:             * Update the stored <code>RenderState</code>.
498:             * 
499:             * @param rc the relevant <code>RenderContext</code>
500:             * @param component the <code>Row</code> component
501:             */
502:            private void storeRenderState(RenderContext rc, Component component) {
503:                int componentCount = component.getVisibleComponentCount();
504:                RowPeerRenderState renderState = new RowPeerRenderState();
505:                if (componentCount > 0) {
506:                    renderState.lastChild = component
507:                            .getVisibleComponent(componentCount - 1);
508:                }
509:                rc.getContainerInstance()
510:                        .setRenderState(component, renderState);
511:            }
512:        }
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