Source Code Cross Referenced for List.java in  » Ajax » MyGWT » net » mygwt » ui » client » widget » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Ajax » MyGWT » net.mygwt.ui.client.widget 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*******************************************************************************
002:         * Copyright (c) 2000, 2007 IBM Corporation and others.
003:         * All rights reserved. This program and the accompanying materials
004:         * are made available under the terms of the Eclipse Public License v1.0
005:         * which accompanies this distribution, and is available at
006:         * http://www.eclipse.org/legal/epl-v10.html
007:         *
008:         * Contributors:
009:         *     IBM Corporation - initial API and implementation
010:         *     Darrell Meyer <darrell@mygwt.net> - derived implementation
011:         *******************************************************************************/package net.mygwt.ui.client.widget;
012:
013:        import java.util.ArrayList;
014:        import java.util.Collections;
015:        import java.util.Comparator;
016:        import java.util.HashMap;
017:        import java.util.Map;
018:
019:        import net.mygwt.ui.client.Events;
020:        import net.mygwt.ui.client.MyDOM;
021:        import net.mygwt.ui.client.MyGWT;
022:        import net.mygwt.ui.client.Style;
023:        import net.mygwt.ui.client.event.BaseEvent;
024:        import net.mygwt.ui.client.util.Markup;
025:        import net.mygwt.ui.client.widget.menu.Menu;
026:
027:        import com.google.gwt.user.client.DOM;
028:        import com.google.gwt.user.client.Element;
029:        import com.google.gwt.user.client.Event;
030:        import com.google.gwt.user.client.ui.KeyboardListener;
031:
032:        /**
033:         * Displays a list of list items.
034:         * 
035:         * <p>
036:         * Important: This component MUST be sized in pixels to render properly. This
037:         * can be done directly or by a layout. Percentage based sizes will not work.
038:         * </p>
039:         * 
040:         * <dl>
041:         * <dt><b>Styles:</b></dt>
042:         * <dd>NONE, SINGLE, MULTI, CHECK, FLAT</dd>
043:         * 
044:         * <dt><b>Events:</b></dt>
045:         * 
046:         * <dd><b>BeforeAdd</b> : (widget, item, index)<br>
047:         * <div>Fires before an item is added or inserted. Listeners can set the
048:         * <code>doit</code> field to <code>false</code> to cancel the action.</div>
049:         * <ul>
050:         * <li>widget : this</li>
051:         * <li>item : the item being added</li>
052:         * <li>index : the index at which the item will be added</li>
053:         * </ul>
054:         * </dd>
055:         * 
056:         * <dd><b>BeforeRemove</b> : (widget, item)<br>
057:         * <div>Fires before an item is removed. Listeners can set the <code>doit</code>
058:         * field to <code>false</code> to cancel the action.</div>
059:         * <ul>
060:         * <li>widget : this</li>
061:         * <li>item : the item being removed</li>
062:         * </ul>
063:         * </dd>
064:         * 
065:         * <dd><b>Add</b> : (widget, item, index)<br>
066:         * <div>Fires after an item has been added or inserted.</div>
067:         * <ul>
068:         * <li>widget : this</li>
069:         * <li>item : the item that was added</li>
070:         * <li>index : the index at which the item will be added</li>
071:         * </ul>
072:         * </dd>
073:         * 
074:         * <dd><b>Remove</b> : (widget, item)<br>
075:         * <div>Fires after an item has been removed.</div>
076:         * <ul>
077:         * <li>widget : this</li>
078:         * <li>item : the item that was removed</li>
079:         * </ul>
080:         * </dd>
081:         * 
082:         * <dd><b>SelectionChange</b> : (widget, item)<br>
083:         * <div>Fires after the selection changes.</div>
084:         * <ul>
085:         * <li>widget : this</li>
086:         * <li>item : the item that is selected (single select)</li>
087:         * </ul>
088:         * </dd>
089:         * 
090:         * <dd><b>ContextMenu</b> : (widget)<br>
091:         * <div>Fires before the list's context menu is shown. Listeners can set the
092:         * <code>doit</code> field to <code>false</code> to cancel the action.</div>
093:         * <ul>
094:         * <li>widget : this</li>
095:         * </ul>
096:         * </dd>
097:         * 
098:         * <dd><b>CheckChange</b> : (widget, item)<br>
099:         * <div>Fires after an item is selected.</div>
100:         * <ul>
101:         * <li>widget : this</li>
102:         * <li>item : the item that is selected (single select)</li>
103:         * </ul>
104:         * </dd>
105:         * 
106:         * <dt><b>CSS:</b></dt>
107:         * <dd>.my-list (the list itself)</dd>
108:         * <dd>.my-listitem (list item)</dd>
109:         * <dd>.my-listitem .my-listitem-text (list item text)</dd>
110:         * </dl>
111:         */
112:        public class List extends ScrollContainer {
113:
114:            /**
115:             * maxDepth specifies the max number of parent nodes to search in
116:             * {@link #findItem(Element)}. Default value is 15.
117:             */
118:            protected int maxDepth = 15;
119:            protected ListItem lastSelected;
120:            protected ListItem hoverItem;
121:            boolean check;
122:            private Element inner;
123:            private ArrayList selected;
124:            private boolean singleSelect;
125:            private boolean multiSelect;
126:            private int selectionMode;
127:            private Map nodes = new HashMap();
128:
129:            /**
130:             * Creates a new single select list.
131:             */
132:            public List() {
133:                this (Style.SINGLE);
134:            }
135:
136:            /**
137:             * Creates a new list with the given style.
138:             * 
139:             * @param style the style information.
140:             */
141:            public List(int style) {
142:                setStyle(style);
143:                baseStyle = "my-list";
144:                attachChildren = false;
145:            }
146:
147:            /**
148:             * Adds an item to the list.
149:             * 
150:             * @param item the item to add
151:             */
152:            public void add(ListItem item) {
153:                insert(item, getWidgetCount());
154:            }
155:
156:            /**
157:             * Adds an item to the list.
158:             * 
159:             * @param text the item's text
160:             */
161:            public void add(String text) {
162:                ListItem item = new ListItem(text);
163:                add(item);
164:            }
165:
166:            /**
167:             * Deselects the item at the given index.
168:             * 
169:             * @param index the index of the item to deselect
170:             */
171:            public void deselect(int index) {
172:                selectItems(index, index, false, true);
173:            }
174:
175:            /**
176:             * Deselects the items at the given indices.
177:             * 
178:             * @param start the start index of the items to deselect
179:             * @param end the start index of the items to deselect
180:             */
181:            public void deselect(int start, int end) {
182:                selectItems(start, end, false, true);
183:            }
184:
185:            /**
186:             * Deselects the item at the given index.
187:             * 
188:             * @param item the item to deselect
189:             */
190:            public void deselect(ListItem item) {
191:                deselect(indexOf(item));
192:            }
193:
194:            /**
195:             * Deselects all selected items.
196:             */
197:            public void deselectAll() {
198:                if (getWidgetCount() > 0) {
199:                    selectItems(0, getWidgetCount() - 1, false, false);
200:                }
201:            }
202:
203:            /**
204:             * Returns the item using the specified target.
205:             * 
206:             * @param element the element or child element
207:             * @return the item
208:             */
209:            public ListItem findItem(Element element) {
210:                if (getItemCount() > 0) {
211:                    String style = getItem(0).baseStyle;
212:                    Element elem = MyDOM.findParent(style, element, maxDepth);
213:                    if (elem != null) {
214:                        return (ListItem) nodes.get(MyDOM.getId(elem));
215:                    }
216:                }
217:                return null;
218:            }
219:
220:            /**
221:             * Returns an array of checked items.
222:             * 
223:             * @return the checked items
224:             */
225:            public ListItem[] getChecked() {
226:                java.util.List temp = new ArrayList();
227:                int count = getItemCount();
228:                for (int i = 0; i < count; i++) {
229:                    if (getItem(i).isChecked()) {
230:                        temp.add(getItem(i));
231:                    }
232:                }
233:                return (ListItem[]) temp.toArray(new ListItem[0]);
234:            }
235:
236:            public Menu getContextMenu() {
237:                return super .getContextMenu();
238:            }
239:
240:            /**
241:             * Returns the item at the specified index.
242:             * 
243:             * @param index the index
244:             * @return the item
245:             */
246:            public ListItem getItem(int index) {
247:                if ((index < 0) || (index >= items.size()))
248:                    return null;
249:                return (ListItem) items.get(index);
250:            }
251:
252:            /**
253:             * Returns the number of child items.
254:             * 
255:             * @return the item count
256:             */
257:            public int getItemCount() {
258:                return items.size();
259:            }
260:
261:            /**
262:             * Returns the child items.
263:             * 
264:             * @return the child items
265:             */
266:            public java.util.List getItems() {
267:                return items;
268:            }
269:
270:            public Element getLayoutTarget() {
271:                return inner;
272:            }
273:
274:            /**
275:             * Returns the selected item. If the list is multi-select, returns the first
276:             * selected item.
277:             * 
278:             * @return the item or <code>null</code> if no selections
279:             */
280:            public ListItem getSelectedItem() {
281:                if (selected.size() > 0) {
282:                    return getSelection()[0];
283:                }
284:                return null;
285:            }
286:
287:            /**
288:             * Returns the selected items.
289:             * 
290:             * @return the selected items
291:             */
292:            public ListItem[] getSelection() {
293:                return (ListItem[]) selected.toArray(new ListItem[0]);
294:            }
295:
296:            /**
297:             * Returns the selection mode.
298:             * 
299:             * @return the selection mode
300:             */
301:            public int getSelectionMode() {
302:                return selectionMode;
303:            }
304:
305:            /**
306:             * Returns the index of the item or -1 if not found.
307:             * 
308:             * @param item the item
309:             * @return the index
310:             */
311:            public int indexOf(ListItem item) {
312:                return items.indexOf(item);
313:            }
314:
315:            /**
316:             * Inserts an item into the list at the given index.
317:             * 
318:             * @param item the item
319:             * @param index the insert location
320:             */
321:            public void insert(ListItem item, int index) {
322:                if (fireEvent(Events.BeforeAdd, this , item, index)) {
323:                    item.list = this ;
324:                    if (check) {
325:                        item.markup = Markup.ITEM_CHECK;
326:                    }
327:                    items.add(index, item);
328:                    if (rendered) {
329:                        renderItem(item, index);
330:                    }
331:                    register(item);
332:                    fireEvent(Events.Add, this , item);
333:                }
334:            }
335:
336:            /**
337:             * Returns <code>true</code> if the item is selected.
338:             * 
339:             * @param item the item
340:             * @return the select state
341:             */
342:            public boolean isSelected(ListItem item) {
343:                return selected.contains(item);
344:            }
345:
346:            /**
347:             * Moves the current selections down one level.
348:             */
349:            public void moveSelectedDown() {
350:                int count = selected.size();
351:                if (count == 0) {
352:                    return;
353:                }
354:                Collections.sort(selected, new Comparator() {
355:
356:                    public int compare(Object o1, Object o2) {
357:                        ListItem li1 = (ListItem) o1;
358:                        ListItem li2 = (ListItem) o2;
359:                        return indexOf(li1) < indexOf(li2) ? 1 : 0;
360:                    }
361:
362:                });
363:                ListItem[] items = new ListItem[count];
364:                for (int i = 0; i < count; i++) {
365:                    items[i] = (ListItem) selected.get(i);
366:                }
367:                for (int j = 0; j < count; j++) {
368:                    int index = indexOf(items[j]);
369:                    if (index != (getItemCount() - 1)) {
370:                        remove(items[j]);
371:                        insert(items[j], ++index);
372:                        selectItems(index, index, true, true, true);
373:                    }
374:                }
375:            }
376:
377:            /**
378:             * Moves the current selections up one level.
379:             */
380:            public void moveSelectedUp() {
381:                int count = selected.size();
382:                if (count == 0) {
383:                    return;
384:                }
385:                Collections.sort(selected, new Comparator() {
386:
387:                    public int compare(Object o1, Object o2) {
388:                        ListItem li1 = (ListItem) o1;
389:                        ListItem li2 = (ListItem) o2;
390:                        return indexOf(li1) > indexOf(li2) ? 1 : 0;
391:                    }
392:
393:                });
394:                ListItem[] items = new ListItem[count];
395:                for (int i = 0; i < count; i++) {
396:                    items[i] = (ListItem) selected.get(i);
397:                }
398:                for (int j = 0; j < count; j++) {
399:                    int index = indexOf(items[j]);
400:                    if (index > 0) {
401:                        remove(items[j]);
402:                        insert(items[j], --index);
403:                        selectItems(index, index, true, true, true);
404:                    }
405:                }
406:            }
407:
408:            public void onBaseEvent(BaseEvent be) {
409:                ListItem item = findItem(be.getTarget());
410:                if (item != null) {
411:                    item.onBrowserEvent(be.event);
412:                }
413:
414:                if (item != null && be.type == Events.MouseDown
415:                        && !be.isRightClick()) {
416:                    onItemClick(be, item);
417:                }
418:
419:                if (lastSelected != null && be.type == Events.KeyDown) {
420:                    onItemKeyPress(be, lastSelected);
421:                }
422:            }
423:
424:            /**
425:             * Removes the item from the list.
426:             * 
427:             * @param item the item to be removed
428:             */
429:            public void remove(ListItem item) {
430:                if (fireEvent(Events.BeforeRemove, this , item)) {
431:                    if (lastSelected == item) {
432:                        lastSelected = null;
433:                    }
434:                    selected.remove(item);
435:                    item.list = null;
436:
437:                    unregister(item);
438:
439:                    super .remove(item);
440:                    fireEvent(Events.Remove, this , item);
441:                }
442:            }
443:
444:            /**
445:             * Removes all the items from the list.
446:             */
447:            public void removeAll() {
448:                int count = getWidgetCount();
449:                for (int i = 0; i < count; i++) {
450:                    remove(getItem(0));
451:                }
452:            }
453:
454:            /**
455:             * Scrolls the item into view.
456:             * 
457:             * @param item the item
458:             */
459:            public void scrollIntoView(ListItem item) {
460:                MyDOM.scrollIntoView(item.getElement(), inner, false);
461:            }
462:
463:            /**
464:             * Selects the item at the index. If the item at the index was already
465:             * selected, it remains selected.
466:             * 
467:             * @param index the index of the item to select
468:             */
469:            public void select(int index) {
470:                selectItems(index, index, true, multiSelect);
471:            }
472:
473:            /**
474:             * Selects the items in the range specified by the given indices. The current
475:             * selection is not cleared before the new items are selected.
476:             * 
477:             * @param start the start of the range
478:             * @param end the end of the range
479:             */
480:            public void select(int start, int end) {
481:                selectItems(start, end, true, true);
482:            }
483:
484:            /**
485:             * Selects the specified item.
486:             * 
487:             * @param item the item to be selected
488:             */
489:            public void select(ListItem item) {
490:                select(indexOf(item));
491:            }
492:
493:            /**
494:             * Selects all of the items in the list. If the list is single-select, do
495:             * nothing.
496:             */
497:            public void selectAll() {
498:                if (multiSelect) {
499:                    selectItems(0, getWidgetCount() - 1, true, true);
500:                }
501:            }
502:
503:            public void setContextMenu(Menu menu) {
504:                super .setContextMenu(menu);
505:            }
506:
507:            /**
508:             * Selects the item. The current selection is cleared.
509:             * 
510:             * @param item the item to select
511:             */
512:            public void setSelection(ListItem item) {
513:                int index = indexOf(item);
514:                selectItems(index, index, true, false);
515:            }
516:
517:            /**
518:             * Selects the items. The current selection is cleared.
519:             * 
520:             * @param items the items to select
521:             */
522:            public void setSelection(ListItem[] items) {
523:                deselectAll();
524:                for (int i = 0; i < items.length; i++) {
525:                    int index = indexOf(items[i]);
526:                    selectItems(index, index, true, false);
527:                }
528:            }
529:
530:            /**
531:             * Sets the selection mode. Valids values are SINGLE and MULTI. Has no effect
532:             * if called after the list is rendered.
533:             * 
534:             * @param mode the selection mode
535:             */
536:            public void setSelectionMode(int mode) {
537:                if (!isRendered()) {
538:                    this .selectionMode = mode;
539:                    singleSelect = mode == Style.SINGLE;
540:                    multiSelect = mode == Style.MULTI;
541:                }
542:            }
543:
544:            /**
545:             * Sets the list's style. Has no effect if called after the list is rendered.
546:             * See the class documentation for valid styles.
547:             * 
548:             * @param style the list style
549:             */
550:            public void setStyle(int style) {
551:                if (!isRendered()) {
552:                    this .style = style | Style.FOCUSABLE;
553:                    attachChildren = false;
554:                    selected = new ArrayList();
555:
556:                    selectionMode = (style & Style.MULTI) != 0 ? Style.MULTI
557:                            : Style.SINGLE;
558:                    singleSelect = selectionMode == Style.SINGLE;
559:                    multiSelect = selectionMode == Style.MULTI;
560:
561:                    if ((style & Style.CHECK) != 0) {
562:                        check = true;
563:                    }
564:                }
565:            }
566:
567:            protected void onHideContextMenu() {
568:                super .onHideContextMenu();
569:                clearHoverStyles();
570:            }
571:
572:            protected void onItemClick(BaseEvent be, ListItem item) {
573:                be.stopEvent();
574:                if (check) {
575:                    Element checkElem;
576:                    if (item.checkBtn == null) {
577:                        checkElem = item.getElement();
578:                    } else {
579:                        checkElem = item.checkBtn.getElement();
580:                    }
581:                    if (DOM.isOrHasChild(checkElem, be.getTarget())) {
582:                        item.setChecked(!item.isChecked());
583:                        fireEvent(Events.CheckChange, this , item);
584:                        return;
585:                    }
586:                }
587:
588:                int index = indexOf(item);
589:
590:                if (DOM.eventGetButton(be.event) == Event.BUTTON_RIGHT) {
591:                    if (singleSelect || getSelection().length == 0) {
592:                        selectItems(index, index, true, false);
593:                    } else {
594:                        selectItems(index, index, true, true);
595:                    }
596:                    return;
597:                }
598:
599:                if (singleSelect) {
600:                    boolean sel = true;
601:                    if (isSelected(item) && be.isControlKey()) {
602:                        sel = false;
603:                    }
604:                    if (isSelected(item)) {
605:                        return;
606:                    }
607:                    selectItems(index, index, sel, false);
608:                    return;
609:                }
610:
611:                if (multiSelect) {
612:                    if (be.isShiftKey()) {
613:                        if (lastSelected != null) {
614:                            selectItems(indexOf(lastSelected), index, true,
615:                                    true);
616:                        } else {
617:                            selectItems(0, index, true, false);
618:                        }
619:                    } else if (be.isControlKey()) {
620:                        selectItems(index, index, !isSelected(item), true);
621:                    } else {
622:                        selectItems(index, index, true, false);
623:                    }
624:                }
625:            }
626:
627:            protected void onRender() {
628:                inner = DOM.createDiv();
629:                MyDOM.setStyleName(inner, baseStyle + "-inner");
630:
631:                setElement(DOM.createDiv());
632:                DOM.appendChild(getElement(), inner);
633:
634:                if ((style & Style.FLAT) != 0) {
635:                    setStyleName(baseStyle + "-flat");
636:                } else {
637:                    setStyleName(baseStyle);
638:                }
639:
640:                setScrollEnabled(true);
641:
642:                disableTextSelection(true);
643:
644:                sinkEvents(Event.ONCLICK | Event.ONDBLCLICK | Event.MOUSEEVENTS
645:                        | Event.KEYEVENTS);
646:                renderAll();
647:            }
648:
649:            protected void onResize(int width, int height) {
650:                if (height != Style.DEFAULT) {
651:                    height -= MyDOM.getBorderWidth(getElement(), Style.TOP
652:                            | Style.BOTTOM);
653:                    height -= 2;// inner padding
654:                    MyDOM.setHeight(inner, height, true);
655:                }
656:                if (width != Style.DEFAULT) {
657:                    width -= MyDOM.getBorderWidth(getElement(), Style.LEFT
658:                            | Style.RIGHT);
659:                    width -= 2;// inner padding
660:                    MyDOM.setWidth(inner, width, true);
661:                }
662:            }
663:
664:            protected void onRightClick(BaseEvent be) {
665:                be.cancelBubble();
666:                clearHoverStyles();
667:                ListItem item = findItem(be.getTarget());
668:                if (item != null) {
669:                    select(item);
670:                }
671:                super .onRightClick(be);
672:            }
673:
674:            private void clearHoverStyles() {
675:                if (hoverItem != null) {
676:                    hoverItem.onMouseOut(null);
677:                }
678:            }
679:
680:            private void onItemKeyPress(BaseEvent be, ListItem item) {
681:                switch (be.getKeyCode()) {
682:                case KeyboardListener.KEY_UP: {
683:                    int index = indexOf(lastSelected) - 1;
684:                    if (index < 0)
685:                        return;
686:                    item = getItem(index);
687:                    if (item != null) {
688:                        selectItems(index, index, true, false);
689:                        MyDOM.scrollIntoView(item.getElement(), getElement(),
690:                                false);
691:                        be.preventDefault();
692:                    }
693:                    break;
694:                }
695:                case KeyboardListener.KEY_DOWN: {
696:                    int index = indexOf(lastSelected) + 1;
697:                    if (index > getItemCount())
698:                        return;
699:                    item = getItem(index);
700:                    if (item != null) {
701:                        selectItems(index, index, true, false);
702:                        MyDOM.scrollIntoView(item.getElement(), getElement(),
703:                                false);
704:                        be.preventDefault();
705:                    }
706:                    break;
707:                }
708:                }
709:            }
710:
711:            private void register(ListItem item) {
712:                nodes.put(item.getId(), item);
713:            }
714:
715:            private void renderAll() {
716:                int ct = getWidgetCount();
717:                for (int i = 0; i < ct; i++) {
718:                    // appendChild is faster than insertChild
719:                    DOM.appendChild(inner, getItem(i).getElement());
720:                }
721:            }
722:
723:            private void renderItem(ListItem item, int index) {
724:                DOM.insertChild(inner, item.getElement(), index);
725:            }
726:
727:            private void selectItems(int startIndex, int endIndex,
728:                    boolean state, boolean keepSelected) {
729:                selectItems(startIndex, endIndex, state, keepSelected, false);
730:            }
731:
732:            private void selectItems(int startIndex, int endIndex,
733:                    boolean state, boolean keepSelected, boolean supressEvents) {
734:                if (startIndex < 0 || endIndex > getItemCount()) {
735:                    return;
736:                }
737:
738:                setSelectionStyles(false);
739:
740:                if (!keepSelected) {
741:                    selected.clear();
742:                }
743:
744:                lastSelected = getItem(endIndex);
745:
746:                int begin = startIndex < endIndex ? startIndex : endIndex;
747:                int end = startIndex < endIndex ? endIndex : startIndex;
748:
749:                for (int i = begin; i <= end; i++) {
750:                    ListItem item = getItem(i);
751:                    if (state) {
752:                        lastSelected = item;
753:                        if (!selected.contains(item)) {
754:                            selected.add(item);
755:                        }
756:                        if (i == begin) {
757:                            scrollIntoView(item);
758:                        }
759:                        if (!supressEvents) {
760:                            fireEvent(Events.SelectionChange, this , item);
761:                        }
762:
763:                    } else {
764:                        selected.remove(item);
765:                        if (!supressEvents) {
766:                            fireEvent(Events.SelectionChange);
767:                        }
768:
769:                    }
770:                }
771:
772:                if (MyGWT.isSafari) {
773:                    focus();
774:                }
775:                setSelectionStyles(true);
776:            }
777:
778:            private void setSelectionStyles(boolean select) {
779:                int count = selected.size();
780:                for (int i = 0; i < count; i++) {
781:                    ListItem item = (ListItem) selected.get(i);
782:                    item.setSelected(select);
783:                }
784:            }
785:
786:            private void unregister(ListItem item) {
787:                nodes.remove(item.getId());
788:            }
789:
790:        }
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