Source Code Cross Referenced for ColumnPeer.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.Border;
038:        import nextapp.echo2.app.Color;
039:        import nextapp.echo2.app.Component;
040:        import nextapp.echo2.app.Extent;
041:        import nextapp.echo2.app.Font;
042:        import nextapp.echo2.app.ImageReference;
043:        import nextapp.echo2.app.Insets;
044:        import nextapp.echo2.app.Column;
045:        import nextapp.echo2.app.LayoutData;
046:        import nextapp.echo2.app.layout.ColumnLayoutData;
047:        import nextapp.echo2.app.update.ServerComponentUpdate;
048:        import nextapp.echo2.webcontainer.ContainerInstance;
049:        import nextapp.echo2.webcontainer.DomUpdateSupport;
050:        import nextapp.echo2.webcontainer.PartialUpdateManager;
051:        import nextapp.echo2.webcontainer.RenderContext;
052:        import nextapp.echo2.webcontainer.RenderState;
053:        import nextapp.echo2.webcontainer.ComponentSynchronizePeer;
054:        import nextapp.echo2.webcontainer.SynchronizePeerFactory;
055:        import nextapp.echo2.webcontainer.image.ImageRenderSupport;
056:        import nextapp.echo2.webcontainer.partialupdate.BorderUpdate;
057:        import nextapp.echo2.webcontainer.partialupdate.ColorUpdate;
058:        import nextapp.echo2.webcontainer.partialupdate.InsetsUpdate;
059:        import nextapp.echo2.webcontainer.propertyrender.BorderRender;
060:        import nextapp.echo2.webcontainer.propertyrender.CellLayoutDataRender;
061:        import nextapp.echo2.webcontainer.propertyrender.ColorRender;
062:        import nextapp.echo2.webcontainer.propertyrender.ExtentRender;
063:        import nextapp.echo2.webcontainer.propertyrender.FontRender;
064:        import nextapp.echo2.webcontainer.propertyrender.InsetsRender;
065:        import nextapp.echo2.webrender.output.CssStyle;
066:        import nextapp.echo2.webrender.servermessage.DomUpdate;
067:
068:        /**
069:         * Synchronization peer for <code>nextapp.echo2.app.Column</code> components.
070:         * <p>
071:         * This class should not be extended or used by classes outside of the
072:         * Echo framework.
073:         */
074:        public class ColumnPeer implements  ComponentSynchronizePeer,
075:                DomUpdateSupport, ImageRenderSupport {
076:
077:            /**
078:             * <code>RenderState</code> implementation.
079:             */
080:            private static class ColumnPeerRenderState implements  RenderState {
081:
082:                /**
083:                 * The child <code>Component</code> which had the highest index during 
084:                 * the last rendering.  This information is necessary when rendering 
085:                 * cell spacing, as the last component will not have a "spacing" row
086:                 * beneath it.  Thus, if it is no longer the last component due to an
087:                 * add, one will need to be added beneath it. 
088:                 */
089:                public Component lastChild;
090:            }
091:
092:            private PartialUpdateManager partialUpdateManager;
093:
094:            /**
095:             * Default constructor.
096:             */
097:            public ColumnPeer() {
098:                partialUpdateManager = new PartialUpdateManager();
099:                partialUpdateManager.add(Column.PROPERTY_BORDER,
100:                        new BorderUpdate(Column.PROPERTY_BORDER, null,
101:                                BorderUpdate.CSS_BORDER));
102:                partialUpdateManager.add(Column.PROPERTY_FOREGROUND,
103:                        new ColorUpdate(Column.PROPERTY_FOREGROUND, null,
104:                                ColorUpdate.CSS_COLOR));
105:                partialUpdateManager.add(Column.PROPERTY_BACKGROUND,
106:                        new ColorUpdate(Column.PROPERTY_BACKGROUND, null,
107:                                ColorUpdate.CSS_BACKGROUND_COLOR));
108:                partialUpdateManager.add(Column.PROPERTY_INSETS,
109:                        new InsetsUpdate(Column.PROPERTY_INSETS, null,
110:                                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>ColumnLayoutData</code> of the given child,
133:             * or null if 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>ColumnLayoutData</code>
139:             */
140:            private ColumnLayoutData 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  ColumnLayoutData) {
146:                    return (ColumnLayoutData) layoutData;
147:                } else {
148:                    throw new RuntimeException(
149:                            "Invalid LayoutData for Column 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>Column</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:                Column column = (Column) update.getParent();
204:                String elementId = ContainerInstance.getElementId(column);
205:
206:                Component[] components = update.getParent()
207:                        .getVisibleComponents();
208:                Component[] addedChildren = update.getAddedChildren();
209:
210:                for (int componentIndex = components.length - 1; componentIndex >= 0; --componentIndex) {
211:                    boolean childFound = false;
212:                    for (int addedChildrenIndex = 0; !childFound
213:                            && addedChildrenIndex < addedChildren.length; ++addedChildrenIndex) {
214:                        if (addedChildren[addedChildrenIndex] == components[componentIndex]) {
215:                            DocumentFragment htmlFragment = rc
216:                                    .getServerMessage().getDocument()
217:                                    .createDocumentFragment();
218:                            renderChild(rc, update, htmlFragment, column,
219:                                    components[componentIndex]);
220:                            if (componentIndex == components.length - 1) {
221:                                DomUpdate.renderElementAddContent(rc
222:                                        .getServerMessage(), domAddElement,
223:                                        elementId, htmlFragment);
224:                            } else {
225:                                DomUpdate
226:                                        .renderElementAddContent(
227:                                                rc.getServerMessage(),
228:                                                domAddElement,
229:                                                elementId,
230:                                                elementId
231:                                                        + "_cell_"
232:                                                        + ContainerInstance
233:                                                                .getElementId(components[componentIndex + 1]),
234:                                                htmlFragment);
235:                            }
236:                            childFound = true;
237:                        }
238:                    }
239:                }
240:
241:                // Special case: Recall the child which was rendered at the last index of the column on the previous
242:                // rendering.  If this child is still present but is no longer at the last index, render a spacing
243:                // cell beneath it (if necessary).
244:                ColumnPeerRenderState renderState = (ColumnPeerRenderState) rc
245:                        .getContainerInstance().getRenderState(column);
246:                if (renderState != null && renderState.lastChild != null) {
247:                    int previousLastChildIndex = column
248:                            .visibleIndexOf(renderState.lastChild);
249:                    if (previousLastChildIndex != -1
250:                            && previousLastChildIndex != column
251:                                    .getVisibleComponentCount() - 1) {
252:                        // At this point it is known that the child which was previously last is present, but is no longer last.
253:
254:                        // In the event the child was removed and re-added, the special case is unnecessary.
255:                        boolean lastChildMoved = false;
256:                        for (int i = 0; i < addedChildren.length; ++i) {
257:                            if (renderState.lastChild == addedChildren[i]) {
258:                                lastChildMoved = true;
259:                            }
260:                        }
261:                        if (!lastChildMoved) {
262:                            DocumentFragment htmlFragment = rc
263:                                    .getServerMessage().getDocument()
264:                                    .createDocumentFragment();
265:                            renderSpacingCell(htmlFragment, column,
266:                                    renderState.lastChild);
267:                            DomUpdate
268:                                    .renderElementAddContent(
269:                                            rc.getServerMessage(),
270:                                            domAddElement,
271:                                            elementId,
272:                                            elementId
273:                                                    + "_cell_"
274:                                                    + ContainerInstance
275:                                                            .getElementId(components[previousLastChildIndex + 1]),
276:                                            htmlFragment);
277:                        }
278:                    }
279:                }
280:            }
281:
282:            /**
283:             * Renders an individual child component of the <code>Column</code>.
284:             * 
285:             * @param rc the relevant <code>RenderContext</code>
286:             * @param update the <code>ServerComponentUpdate</code> being performed
287:             * @param parentNode the containing node to which the child should be 
288:             *        appended
289:             * @param child The child <code>Component</code> to be rendered
290:             */
291:            private void renderChild(RenderContext rc,
292:                    ServerComponentUpdate update, Node parentNode,
293:                    Component component, Component child) {
294:                Document document = parentNode.getOwnerDocument();
295:                String childId = ContainerInstance.getElementId(child);
296:                Element divElement = document.createElement("div");
297:                String cellId = ContainerInstance.getElementId(component)
298:                        + "_cell_" + childId;
299:                divElement.setAttribute("id", cellId);
300:
301:                // Configure cell style.
302:                CssStyle cssStyle = new CssStyle();
303:                ColumnLayoutData layoutData = getLayoutData(child);
304:                CellLayoutDataRender.renderToElementAndStyle(divElement,
305:                        cssStyle, child, layoutData, "0px");
306:                CellLayoutDataRender.renderBackgroundImageToStyle(cssStyle, rc,
307:                        this , component, child);
308:                if (layoutData != null) {
309:                    ExtentRender.renderToStyle(cssStyle, "height", layoutData
310:                            .getHeight());
311:                }
312:                divElement.setAttribute("style", cssStyle.renderInline());
313:
314:                parentNode.appendChild(divElement);
315:
316:                renderSpacingCell(parentNode, (Column) component, child);
317:
318:                renderAddChild(rc, update, divElement, child);
319:            }
320:
321:            /**
322:             * @see nextapp.echo2.webcontainer.ComponentSynchronizePeer#renderDispose(nextapp.echo2.webcontainer.RenderContext, 
323:             *      nextapp.echo2.app.update.ServerComponentUpdate, nextapp.echo2.app.Component)
324:             */
325:            public void renderDispose(RenderContext rc,
326:                    ServerComponentUpdate update, Component component) {
327:            }
328:
329:            /**
330:             * @see nextapp.echo2.webcontainer.DomUpdateSupport#renderHtml(nextapp.echo2.webcontainer.RenderContext, 
331:             *      nextapp.echo2.app.update.ServerComponentUpdate, org.w3c.dom.Node, nextapp.echo2.app.Component)
332:             */
333:            public void renderHtml(RenderContext rc,
334:                    ServerComponentUpdate update, Node parentNode,
335:                    Component component) {
336:                Column column = (Column) component;
337:
338:                Document document = parentNode.getOwnerDocument();
339:                Element divElement = document.createElement("div");
340:                divElement.setAttribute("id", ContainerInstance
341:                        .getElementId(column));
342:
343:                CssStyle divCssStyle = new CssStyle();
344:                BorderRender.renderToStyle(divCssStyle, (Border) column
345:                        .getRenderProperty(Column.PROPERTY_BORDER));
346:                ColorRender.renderToStyle(divCssStyle, (Color) column
347:                        .getRenderProperty(Column.PROPERTY_FOREGROUND),
348:                        (Color) column
349:                                .getRenderProperty(Column.PROPERTY_BACKGROUND));
350:                FontRender.renderToStyle(divCssStyle, (Font) column
351:                        .getRenderProperty(Column.PROPERTY_FONT));
352:                Insets insets = (Insets) column
353:                        .getRenderProperty(Column.PROPERTY_INSETS);
354:                if (insets == null) {
355:                    divCssStyle.setAttribute("padding", "0px");
356:                } else {
357:                    InsetsRender.renderToStyle(divCssStyle, "padding", insets);
358:                }
359:
360:                divElement.setAttribute("style", divCssStyle.renderInline());
361:
362:                parentNode.appendChild(divElement);
363:
364:                Component[] children = column.getVisibleComponents();
365:                for (int i = 0; i < children.length; ++i) {
366:                    renderChild(rc, update, divElement, component, children[i]);
367:                }
368:
369:                storeRenderState(rc, column);
370:            }
371:
372:            /**
373:             * Renders removal operations for child components which were removed from 
374:             * a <code>Column</code>, as described in the provided 
375:             * <code>ServerComponentUpdate</code>.
376:             * 
377:             * @param rc the relevant <code>RenderContext</code>
378:             * @param update the update
379:             */
380:            private void renderRemoveChildren(RenderContext rc,
381:                    ServerComponentUpdate update) {
382:                Component[] removedChildren = update.getRemovedChildren();
383:                Component parent = update.getParent();
384:                String parentId = ContainerInstance.getElementId(parent);
385:                for (int i = 0; i < removedChildren.length; ++i) {
386:                    String childId = ContainerInstance
387:                            .getElementId(removedChildren[i]);
388:                    DomUpdate.renderElementRemove(rc.getServerMessage(),
389:                            parentId + "_cell_" + childId);
390:                    DomUpdate.renderElementRemove(rc.getServerMessage(),
391:                            parentId + "_spacing_" + childId);
392:                }
393:
394:                int componentCount = parent.getVisibleComponentCount();
395:                if (componentCount > 0) {
396:                    DomUpdate
397:                            .renderElementRemove(
398:                                    rc.getServerMessage(),
399:                                    parentId
400:                                            + "_spacing_"
401:                                            + ContainerInstance
402:                                                    .getElementId(parent
403:                                                            .getVisibleComponent(componentCount - 1)));
404:                }
405:            }
406:
407:            /**
408:             * Renders a "spacing cell" beneath a column cell to provide
409:             * cell spacing.
410:             * 
411:             * @param parentNode the containing node to which the child
412:             *        should be appended
413:             * @param column the <code>Column</code> being updated
414:             * @param child the child preceeding the spacing column
415:             */
416:            private void renderSpacingCell(Node parentNode, Column column,
417:                    Component child) {
418:                Extent cellSpacing = (Extent) column
419:                        .getRenderProperty(Column.PROPERTY_CELL_SPACING);
420:                if (!ExtentRender.isZeroLength(cellSpacing)
421:                        && column.visibleIndexOf(child) != column
422:                                .getVisibleComponentCount() - 1) {
423:                    Element spacingElement = parentNode.getOwnerDocument()
424:                            .createElement("div");
425:                    spacingElement.setAttribute("id", ContainerInstance
426:                            .getElementId(column)
427:                            + "_spacing_"
428:                            + ContainerInstance.getElementId(child));
429:                    CssStyle spacingCssStyle = new CssStyle();
430:                    spacingCssStyle.setAttribute("height", ExtentRender
431:                            .renderCssAttributeValue(cellSpacing));
432:                    spacingCssStyle.setAttribute("font-size", "1px");
433:                    spacingCssStyle.setAttribute("line-height", "0px");
434:                    spacingElement.setAttribute("style", spacingCssStyle
435:                            .renderInline());
436:                    parentNode.appendChild(spacingElement);
437:                }
438:            }
439:
440:            /**
441:             * @see nextapp.echo2.webcontainer.ComponentSynchronizePeer#renderUpdate(nextapp.echo2.webcontainer.RenderContext, 
442:             *      nextapp.echo2.app.update.ServerComponentUpdate, java.lang.String)
443:             */
444:            public boolean renderUpdate(RenderContext rc,
445:                    ServerComponentUpdate update, String targetId) {
446:                // Determine if fully replacing the component is required.
447:                boolean fullReplace = false;
448:                if (update.hasUpdatedLayoutDataChildren()) {
449:                    // TODO: Perform fractional update on LayoutData change instead of full replace.
450:                    fullReplace = true;
451:                } else if (update.hasUpdatedProperties()) {
452:                    if (!partialUpdateManager.canProcess(rc, update)) {
453:                        fullReplace = true;
454:                    }
455:                }
456:
457:                if (fullReplace) {
458:                    // Perform full update.
459:                    DomUpdate.renderElementRemove(rc.getServerMessage(),
460:                            ContainerInstance.getElementId(update.getParent()));
461:                    renderAdd(rc, update, targetId, update.getParent());
462:                } else {
463:                    // Perform incremental updates.
464:                    if (update.hasRemovedChildren()) {
465:                        renderRemoveChildren(rc, update);
466:                    }
467:                    if (update.hasUpdatedProperties()) {
468:                        partialUpdateManager.process(rc, update);
469:                    }
470:                    if (update.hasAddedChildren()) {
471:                        renderAddChildren(rc, update);
472:                    }
473:                }
474:
475:                storeRenderState(rc, update.getParent());
476:                return fullReplace;
477:            }
478:
479:            /**
480:             * Update the stored <code>RenderState</code>.
481:             * 
482:             * @param rc the relevant <code>RenderContext</code>
483:             * @param component the <code>Column</code> component
484:             */
485:            private void storeRenderState(RenderContext rc, Component component) {
486:                int componentCount = component.getVisibleComponentCount();
487:                ColumnPeerRenderState renderState = new ColumnPeerRenderState();
488:                if (componentCount > 0) {
489:                    renderState.lastChild = component
490:                            .getVisibleComponent(componentCount - 1);
491:                }
492:                rc.getContainerInstance()
493:                        .setRenderState(component, renderState);
494:            }
495:        }
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