Source Code Cross Referenced for Item.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:         * MyGWT Widget Library
003:         * Copyright(c) 2007, MyGWT.
004:         * licensing@mygwt.net
005:         * 
006:         * http://mygwt.net/license
007:         */
008:        package net.mygwt.ui.client.widget;
009:
010:        import java.util.ArrayList;
011:        import java.util.HashMap;
012:        import java.util.List;
013:        import java.util.Map;
014:
015:        import net.mygwt.ui.client.Events;
016:        import net.mygwt.ui.client.MyDOM;
017:        import net.mygwt.ui.client.event.BaseEvent;
018:        import net.mygwt.ui.client.util.Format;
019:        import net.mygwt.ui.client.util.Markup;
020:        import net.mygwt.ui.client.util.Rectangle;
021:
022:        import com.google.gwt.user.client.Command;
023:        import com.google.gwt.user.client.DOM;
024:        import com.google.gwt.user.client.DeferredCommand;
025:        import com.google.gwt.user.client.Element;
026:        import com.google.gwt.user.client.Event;
027:        import com.google.gwt.user.client.ui.HasText;
028:        import com.google.gwt.user.client.ui.HorizontalPanel;
029:        import com.google.gwt.user.client.ui.Widget;
030:        import com.google.gwt.user.client.ui.WidgetHelper;
031:
032:        /**
033:         * A horizontal component with 5 regions - left, mid left, center, mid right,
034:         * and right. Provides support for a icon in the 2nd region, text in the 3rd,
035:         * and widgets in the 4th. The first and last regions are used for styling such
036:         * as the rounded corners of a tab item.
037:         */
038:        public class Item extends Component implements  HasText {
039:
040:            private static final Map elementCache = new HashMap();
041:
042:            private static native Element clone(Element e, boolean deep) /*-{
043:                 return e.cloneNode(deep);
044:               }-*/;
045:
046:            // allow subclasses to overwrite if this component should sinkEvents
047:            protected boolean sinkEvents = true;
048:
049:            protected boolean overStyleEnabled = true;
050:            protected String baseStyle, iconStyle;
051:            protected Element midleftElem, midRightElem;
052:            protected IconButton iconBtn;
053:            protected List widgets;
054:            protected HorizontalPanel widgetPanel;
055:            protected String markup;
056:            protected Element centerElem, textElem;
057:
058:            private String text;
059:            private boolean hovering;
060:            private boolean selected;
061:            private int spacing;
062:
063:            /**
064:             * Creates a new item.
065:             */
066:            public Item() {
067:
068:            }
069:
070:            /**
071:             * Creates a new item.
072:             * 
073:             * @param style the style information
074:             * @param baseStyle the base style
075:             */
076:            public Item(int style, String baseStyle) {
077:                super (style);
078:                this .baseStyle = baseStyle;
079:            }
080:
081:            /**
082:             * Creates a new item.
083:             * 
084:             * @param baseStyle the base style
085:             */
086:            public Item(String baseStyle) {
087:                this .baseStyle = baseStyle;
088:            }
089:
090:            /**
091:             * Adds a widget to region 4.
092:             * 
093:             * @param widget the widget to add
094:             */
095:            public void addWidget(Widget widget) {
096:                if (widgets == null) {
097:                    widgets = new ArrayList();
098:                }
099:                widgets.add(widget);
100:                if (rendered) {
101:                    if (widgetPanel == null) {
102:                        widgetPanel = new HorizontalPanel();
103:                        DOM.appendChild(midRightElem, widgetPanel.getElement());
104:                        if (isAttached()) {
105:                            WidgetHelper.doAttach(widgetPanel);
106:                        }
107:                    }
108:                    widgetPanel.add(widget);
109:                }
110:            }
111:
112:            /**
113:             * Returns the item's icon style.
114:             * 
115:             * @return the icon style
116:             */
117:            public String getIconStyle() {
118:                return iconStyle;
119:            }
120:
121:            /**
122:             * Returns the item's text.
123:             * 
124:             * @return the text
125:             */
126:            public String getText() {
127:                return text;
128:            }
129:
130:            /**
131:             * Returns a widget from region 4.
132:             * 
133:             * @param index the index
134:             * @return the widget
135:             */
136:            public Widget getWidget(int index) {
137:                if (widgets != null) {
138:                    widgets.remove(index);
139:                    if (rendered) {
140:                        return widgetPanel.getWidget(index);
141:                    }
142:                }
143:                return null;
144:            }
145:
146:            /**
147:             * Inserts a widget into region 4.
148:             * 
149:             * @param widget the widget to insert
150:             * @param index the insert index
151:             */
152:            public void insertWidget(Widget widget, int index) {
153:                if (widgets == null) {
154:                    widgets = new ArrayList();
155:                }
156:                widgets.add(index, widget);
157:                if (rendered) {
158:                    if (widgetPanel == null) {
159:                        widgetPanel = new HorizontalPanel();
160:                        DOM.appendChild(midRightElem, widgetPanel.getElement());
161:                        if (isAttached()) {
162:                            WidgetHelper.doAttach(widgetPanel);
163:                        }
164:                    }
165:                    widgetPanel.insert(widget, index);
166:                }
167:            }
168:
169:            public void onBaseEvent(BaseEvent be) {
170:                Rectangle rect = MyDOM.getBounds(getElement());
171:                if (rect.contains(be.getClientX(), be.getClientY())) {
172:                    if (!hovering) {
173:                        hovering = true;
174:                        onMouseOver(be);
175:                    }
176:                } else {
177:                    hovering = false;
178:                    onMouseOut(be);
179:                }
180:
181:                switch (be.type) {
182:                case Event.ONMOUSEDOWN:
183:                    onMouseDown(be);
184:                    break;
185:                case Event.ONMOUSEUP:
186:                    onMouseUp(be);
187:                    break;
188:                case Event.ONCLICK:
189:                    onClick(be);
190:                    break;
191:                }
192:
193:            }
194:
195:            /**
196:             * Removes a widget from region 4.
197:             * 
198:             * @param widget the widget to remove
199:             */
200:            public void removeWidget(Widget widget) {
201:                if (widgets != null) {
202:                    widgets.remove(widget);
203:                    if (rendered) {
204:                        widgetPanel.remove(widget);
205:                    }
206:                }
207:            }
208:
209:            /**
210:             * A CSS style which sets a background image to be used as the icon.
211:             * 
212:             * @param iconStyle the CSS class name
213:             */
214:            public void setIconStyle(String iconStyle) {
215:                this .iconStyle = iconStyle;
216:                if (rendered) {
217:                    if (iconBtn == null) {
218:                        iconBtn = new IconButton(iconStyle);
219:                        DOM.appendChild(midleftElem, iconBtn.getElement());
220:                        iconBtn.removeStyleName("my-nodrag");
221:                    }
222:                    iconBtn.changeStyle(iconStyle);
223:                }
224:            }
225:
226:            /**
227:             * Sets the item's text.
228:             * 
229:             * @param text the new text
230:             */
231:            public void setText(String text) {
232:                this .text = text;
233:                if (rendered) {
234:                    MyDOM.setInnerHTML(textElem, text);
235:                }
236:            }
237:
238:            /**
239:             * Sets the amount of spacing around the widgets in the "tool" area.
240:             * 
241:             * @param spacing the spacing in pixels
242:             */
243:            public void setWidgetSpacing(int spacing) {
244:                this .spacing = spacing;
245:                if (rendered) {
246:                    widgetPanel.setSpacing(spacing);
247:                }
248:            }
249:
250:            protected void doAttachChildren() {
251:                if (widgetPanel != null) {
252:                    WidgetHelper.doAttach(widgetPanel);
253:                }
254:            }
255:
256:            protected void doDetachChildren() {
257:                if (widgetPanel != null) {
258:                    WidgetHelper.doDetach(widgetPanel);
259:                }
260:            }
261:
262:            protected boolean isSelected() {
263:                return selected;
264:            }
265:
266:            protected void onClick(final BaseEvent be) {
267:                be.stopEvent();
268:                hovering = false;
269:                DeferredCommand.addCommand(new Command() {
270:                    public void execute() {
271:                        onMouseOut(be);
272:                        fireEvent(Events.MouseOut, be);
273:                    }
274:                });
275:            }
276:
277:            protected void onDisable() {
278:                super .onDisable();
279:                if (overStyleEnabled) {
280:                    removeStyleName(baseStyle + "-over");
281:                    removeStyleName(baseStyle + "-down");
282:                }
283:                if (iconBtn != null) {
284:                    iconBtn.setEnabled(false);
285:                }
286:            }
287:
288:            protected void onEnable() {
289:                super .onEnable();
290:                if (iconBtn != null) {
291:                    iconBtn.setEnabled(true);
292:                }
293:            }
294:
295:            protected void onMouseDown(BaseEvent be) {
296:                addStyleName(baseStyle + "-down");
297:            }
298:
299:            protected void onMouseOut(BaseEvent be) {
300:                if (overStyleEnabled) {
301:                    removeStyleName(baseStyle + "-over");
302:                    removeStyleName(baseStyle + "-down");
303:                }
304:            }
305:
306:            protected void onMouseOver(BaseEvent be) {
307:                if (overStyleEnabled) {
308:                    addStyleName(baseStyle + "-over");
309:                }
310:            }
311:
312:            protected void onMouseUp(BaseEvent be) {
313:                removeStyleName(baseStyle + "-down");
314:            }
315:
316:            protected void onRender() {
317:                if (markup == null) {
318:                    markup = Markup.ITEM;
319:                }
320:
321:                String cacheKey = baseStyle + ":" + markup;
322:                Element element = (Element) elementCache.get(cacheKey);
323:                if (element == null) {
324:                    element = MyDOM
325:                            .create(Format.substitute(markup, baseStyle));
326:                    elementCache.put(cacheKey, element);
327:                }
328:                setElement(clone(element, true));
329:
330:                midleftElem = MyDOM.findChild(baseStyle + "-ml", getElement());
331:                centerElem = DOM.getNextSibling(midleftElem);
332:                textElem = DOM.getFirstChild(centerElem);
333:                midRightElem = DOM.getNextSibling(centerElem);
334:
335:                if (text != null) {
336:                    setText(text);
337:                }
338:
339:                if (iconStyle != null) {
340:                    setIconStyle(iconStyle);
341:                }
342:
343:                if (widgets != null) {
344:                    widgetPanel = new HorizontalPanel();
345:                    for (int i = 0; i < widgets.size(); i++) {
346:                        widgetPanel.add((Widget) widgets.get(i));
347:                    }
348:                    DOM.appendChild(midRightElem, widgetPanel.getElement());
349:                }
350:
351:                if (spacing > 0) {
352:                    setWidgetSpacing(spacing);
353:                }
354:
355:                disableTextSelection(true);
356:
357:                if (sinkEvents) {
358:                    sinkEvents(Event.ONCLICK | Event.ONDBLCLICK
359:                            | Event.MOUSEEVENTS);
360:                }
361:
362:            }
363:
364:            protected void setSelected(boolean select) {
365:                selected = select;
366:                if (selected) {
367:                    removeStyleName(baseStyle + "-over");
368:                    addStyleName(baseStyle + "-sel");
369:                } else {
370:                    removeStyleName(baseStyle + "-sel");
371:                }
372:            }
373:        }
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