Source Code Cross Referenced for ChoiceGroupLFImpl.java in  » 6.0-JDK-Modules » j2me » javax » microedition » lcdui » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » 6.0 JDK Modules » j2me » javax.microedition.lcdui 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         *   
003:         *
004:         * Copyright  1990-2007 Sun Microsystems, Inc. All Rights Reserved.
005:         * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER
006:         * 
007:         * This program is free software; you can redistribute it and/or
008:         * modify it under the terms of the GNU General Public License version
009:         * 2 only, as published by the Free Software Foundation.
010:         * 
011:         * This program is distributed in the hope that it will be useful, but
012:         * WITHOUT ANY WARRANTY; without even the implied warranty of
013:         * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
014:         * General Public License version 2 for more details (a copy is
015:         * included at /legal/license.txt).
016:         * 
017:         * You should have received a copy of the GNU General Public License
018:         * version 2 along with this work; if not, write to the Free Software
019:         * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
020:         * 02110-1301 USA
021:         * 
022:         * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa
023:         * Clara, CA 95054 or visit www.sun.com if you need additional
024:         * information or have any questions.
025:         */
026:
027:        package javax.microedition.lcdui;
028:
029:        import com.sun.midp.configurator.Constants;
030:        import javax.microedition.lcdui.ChoiceGroup.CGElement;
031:
032:        /**
033:         *  This is the look and feel implementation for ChoiceGroup.
034:         */
035:        class ChoiceGroupLFImpl extends ItemLFImpl implements  ChoiceGroupLF {
036:
037:            /**
038:             * Creates ChoiceLF for the passed in ChoiceGroup.
039:             * @param choiceGroup - the ChoiceGroup object associated with this view
040:             */
041:            ChoiceGroupLFImpl(ChoiceGroup choiceGroup) {
042:                super (choiceGroup);
043:
044:                cg = choiceGroup;
045:
046:                if (cg.numOfEls > 0 && cg.choiceType != Choice.MULTIPLE) {
047:                    selectedIndex = 0;
048:                    cg.cgElements[selectedIndex].setSelected(true);
049:                }
050:            }
051:
052:            // *******************************************************
053:            // ChoiceGroupLF implementation
054:            // ********************************************************
055:
056:            /**
057:             * Notifies Look &amps; Feel that an element was inserted into the 
058:             * <code>ChoiceGroup</code> at the the elementNum specified.
059:             *
060:             * @param elementNum the index of the element where insertion occurred
061:             * @param stringPart the string part of the element to be inserted
062:             * @param imagePart the image part of the element to be inserted,
063:             * or <code>null</code> if there is no image part
064:             */
065:            public void lInsert(int elementNum, String stringPart,
066:                    Image imagePart) {
067:                // make sure that there is a default selection
068:                if (cg.choiceType != Choice.MULTIPLE) {
069:                    if (selectedIndex == -1) {
070:                        selectedIndex = 0;
071:                        cg.cgElements[selectedIndex].setSelected(true);
072:                    } else if (elementNum < selectedIndex
073:                            && nativeId == DisplayableLFImpl.INVALID_NATIVE_ID) {
074:                        // an element was inserted before selectedIndex and
075:                        // selectedIndex has to be updated
076:                        selectedIndex++;
077:                    }
078:                }
079:
080:                // Only update native resource if it exists.
081:                if (nativeId != DisplayableLFImpl.INVALID_NATIVE_ID) {
082:                    ImageData imagePartData = null;
083:
084:                    if (imagePart != null) {
085:                        imagePartData = imagePart.getImageData();
086:                    }
087:
088:                    insert0(nativeId, elementNum, stringPart, imagePartData,
089:                            cg.cgElements[elementNum].selected);
090:                }
091:
092:                lRequestInvalidate(true, true);
093:            }
094:
095:            /**
096:             * Notifies Look &amps; Feel that an element referenced by
097:             * <code>elementNum</code> was deleted in the corresponding
098:             * ChoiceGroup.
099:             *
100:             * @param elementNum the index of the deleted element
101:             */
102:            public void lDelete(int elementNum) {
103:
104:                // adjust selected index
105:                if (cg.numOfEls == 0) {
106:                    selectedIndex = -1;
107:                } else if (cg.choiceType != ChoiceGroup.MULTIPLE) {
108:                    if (nativeId != DisplayableLFImpl.INVALID_NATIVE_ID) {
109:                        if (selectedIndex != -1 && selectedIndex < cg.numOfEls) {
110:                            cg.cgElements[selectedIndex].setSelected(false);
111:                        }
112:                        selectedIndex = getSelectedIndex0(nativeId);
113:                    }
114:
115:                    if (elementNum < selectedIndex) {
116:                        selectedIndex--;
117:                    } else if (elementNum == selectedIndex
118:                            && selectedIndex == cg.numOfEls) {
119:                        // last element is selected and deleted - 
120:                        // new last should be selected
121:                        selectedIndex = cg.numOfEls - 1;
122:                    }
123:                    cg.cgElements[selectedIndex].setSelected(true);
124:                }
125:
126:                if (nativeId != DisplayableLFImpl.INVALID_NATIVE_ID) {
127:                    delete0(nativeId, elementNum, selectedIndex);
128:                }
129:
130:                lRequestInvalidate(true, true);
131:            }
132:
133:            /**
134:             * Notifies Look &amps; Feel that all elements 
135:             * were deleted in the corresponding ChoiceGroup.
136:             */
137:            public void lDeleteAll() {
138:                // Only update native resource if it exists.
139:                if (nativeId != DisplayableLFImpl.INVALID_NATIVE_ID) {
140:                    deleteAll0(nativeId);
141:                }
142:                selectedIndex = -1;
143:                lRequestInvalidate(true, true);
144:            }
145:
146:            /**
147:             * Notifies Look &amps; Fell that the <code>String</code> and 
148:             * <code>Image</code> parts of the
149:             * element referenced by <code>elementNum</code> were set in
150:             * the corresponding ChoiceGroup,
151:             * replacing the previous contents of the element.
152:             *
153:             * @param elementNum the index of the element set
154:             * @param stringPart the string part of the new element
155:             * @param imagePart the image part of the element, or <code>null</code>
156:             * if there is no image part
157:             */
158:            public void lSet(int elementNum, String stringPart, Image imagePart) {
159:                // Only update native resource if it exists.
160:                if (nativeId != DisplayableLFImpl.INVALID_NATIVE_ID) {
161:                    ImageData imagePartData = null;
162:                    if (imagePart != null) {
163:                        imagePartData = imagePart.getImageData();
164:                    }
165:
166:                    // for selected value to be passed correctly to the 
167:                    // newly created element we have to do the sync first
168:                    // (alternatively we could rely on native to maintain
169:                    // the selected state correctly)
170:                    syncSelectedIndex();
171:                    syncSelectedFlags();
172:                    set0(nativeId, elementNum, stringPart, imagePartData,
173:                            cg.cgElements[elementNum].selected);
174:                }
175:                lRequestInvalidate(true, true);
176:            }
177:
178:            /**
179:             * Notifies Look &amps; Feel that an element was selected (or
180:             * deselected) in the corresponding ChoiceGroup.
181:             *
182:             * @param elementNum the number of the element. Indexing of the
183:             * elements is zero-based
184:             * @param selected the new state of the element <code>true=selected</code>,
185:             * <code>false=not</code> selected
186:             */
187:            public void lSetSelectedIndex(int elementNum, boolean selected) {
188:                // Only update native resource if it exists.
189:                if (nativeId != DisplayableLFImpl.INVALID_NATIVE_ID) {
190:                    setSelectedIndex0(nativeId, elementNum, selected);
191:                } else {
192:                    if (cg.choiceType == Choice.MULTIPLE) {
193:                        cg.cgElements[elementNum].setSelected(selected);
194:                    } else {
195:                        // selected item cannot be deselected in 
196:                        // EXCLUSIVE, IMPLICIT, POPUP ChoiceGroup
197:                        if (!selected || (/* choiceType != Choice.IMPLICIT && */
198:                        selectedIndex == elementNum)) {
199:                            return;
200:                        }
201:
202:                        cg.cgElements[selectedIndex].setSelected(false);
203:                        selectedIndex = elementNum;
204:                        cg.cgElements[selectedIndex].setSelected(true);
205:                    }
206:                }
207:            }
208:
209:            /**
210:             * Notifies Look &amps; Feel that selected state was changed on
211:             * several elements in the corresponding MULTIPLE ChoiceGroup
212:             * (cannot be null).
213:             * @param selectedArray an array in which the method collect the
214:             * selection status
215:             */
216:            public void lSetSelectedFlags(boolean[] selectedArray) {
217:                // Only update native resource if it exists.
218:                if (nativeId != DisplayableLFImpl.INVALID_NATIVE_ID) {
219:                    setSelectedFlags0(nativeId, selectedArray,
220:                            selectedArray.length);
221:                }
222:            }
223:
224:            /**
225:             * Notifies Look &amps; Feel that a new text fit policy was set
226:             * in the corresponding ChoiceGroup.
227:             * @param fitPolicy preferred content fit policy for choice elements
228:             */
229:            public void lSetFitPolicy(int fitPolicy) {
230:                // Only update native resource if it exists.
231:                if (nativeId != DisplayableLFImpl.INVALID_NATIVE_ID) {
232:                    setFitPolicy0(nativeId, fitPolicy);
233:                    lRequestInvalidate(true, true);
234:                }
235:            }
236:
237:            /**
238:             * Notifies Look &amps; Feel that a new font was set for an
239:             * element with the  specified elementNum in the 
240:             * corresponding ChoiceGroup.
241:             * @param elementNum the index of the element, starting from zero
242:             * @param font the preferred font to use to render the element
243:             */
244:            public void lSetFont(int elementNum, Font font) {
245:                // Only update native resource if it exists.
246:                if (nativeId != DisplayableLFImpl.INVALID_NATIVE_ID) {
247:                    setFont0(nativeId, elementNum, font.getFace(), font
248:                            .getStyle(), font.getSize());
249:                    lRequestInvalidate(true, true);
250:                }
251:            }
252:
253:            /**
254:             * Gets default font to render ChoiceGroup element if it was not
255:             * set by the application
256:             * @return - the font to render ChoiceGroup element if it was not 
257:             *           set by the app
258:             */
259:            public Font getDefaultFont() {
260:                return Theme.curContentFont;
261:            }
262:
263:            /**
264:             * Gets currently selected index 
265:             * @return currently selected index
266:             */
267:            public int lGetSelectedIndex() {
268:                if (nativeId == DisplayableLFImpl.INVALID_NATIVE_ID) {
269:                    return selectedIndex;
270:                } else {
271:                    // sync with native
272:                    syncSelectedIndex();
273:                    return selectedIndex;
274:                }
275:            }
276:
277:            /**
278:             * Gets selected flags.(only elements corresponding to the 
279:             * elements are expected to be filled). ChoiceGroup sets the rest to
280:             * false
281:             * @param selectedArray_return to contain the results
282:             * @return the number of selected elements
283:             */
284:            public int lGetSelectedFlags(boolean[] selectedArray_return) {
285:                int countSelected = 0;
286:                if (nativeId == DisplayableLFImpl.INVALID_NATIVE_ID) {
287:                    for (int i = 0; i < cg.numOfEls; i++) {
288:                        selectedArray_return[i] = cg.cgElements[i].selected;
289:                        if (selectedArray_return[i]) {
290:                            countSelected++;
291:                        }
292:                    }
293:
294:                } else {
295:                    countSelected = getSelectedFlags0(nativeId,
296:                            selectedArray_return, cg.numOfEls);
297:
298:                    // sync with native
299:                    for (int i = 0; i < cg.numOfEls; i++) {
300:                        cg.cgElements[i].setSelected(selectedArray_return[i]);
301:                    }
302:                }
303:                return countSelected;
304:            }
305:
306:            /**
307:             * Determines if an element with a passed in index
308:             * is selected or not.
309:             * @param elementNum the index of an element in question
310:             * @return true if the element is selected, false - otherwise
311:             */
312:            public boolean lIsSelected(int elementNum) {
313:                if (nativeId == DisplayableLFImpl.INVALID_NATIVE_ID) {
314:                    return cg.cgElements[elementNum].selected;
315:                }
316:
317:                return isSelected0(nativeId, elementNum);
318:            }
319:
320:            // *****************************************************
321:            //  Package private methods
322:            // *****************************************************
323:
324:            /**
325:             * Called by event delivery to notify an ItemLF in current FormLF
326:             * of a change in its peer state.
327:             *
328:             * @param hint index of the element whose selection status has changed
329:             * @return always true so ItemStateListener should be notified
330:             */
331:            boolean uCallPeerStateChanged(int hint) {
332:                // Any hint means selection has change
333:                // For types other than IMPLICIT List, notify itemStateListener.
334:                if (cg.choiceType != Choice.IMPLICIT) {
335:                    return true; // notify itemStateListener
336:                }
337:
338:                // For IMPLICIT List, notify commandListener
339:                List list;
340:                CommandListener cl;
341:                Command cmd;
342:
343:                synchronized (Display.LCDUILock) {
344:                    list = (List) cg.owner;
345:
346:                    if (list.listener == null || list.selectCommand == null
347:                            || cg.numOfEls == 0) {
348:                        return false; // No itemStateListener to notify
349:                    }
350:
351:                    cl = list.listener;
352:                    cmd = list.selectCommand;
353:                }
354:
355:                try {
356:                    synchronized (Display.calloutLock) {
357:                        cl.commandAction(cmd, list);
358:                    }
359:                } catch (Throwable thr) {
360:                    Display.handleThrowable(thr);
361:                }
362:
363:                return false; // No itemStateListener to notify
364:            }
365:
366:            /**
367:             * Determine if this Item should have a newline after it
368:             *
369:             * @return true if it should have a newline after
370:             */
371:            boolean equateNLA() {
372:                if (super .equateNLA()) {
373:                    return true;
374:                }
375:                return ((cg.layout & Item.LAYOUT_2) != Item.LAYOUT_2);
376:            }
377:
378:            /**
379:             * Determine if this Item should have a newline before it
380:             *
381:             * @return true if it should have a newline before
382:             */
383:            boolean equateNLB() {
384:                if (super .equateNLB()) {
385:                    return true;
386:                }
387:
388:                return ((cg.layout & Item.LAYOUT_2) != Item.LAYOUT_2);
389:            }
390:
391:            /**
392:            /**
393:             * Override <code>ItemLFImpl</code> method to sync with native resource
394:             * before hiding the native resource. Selection of native resource will 
395:             * be preserved before the resource is hidden.
396:             */
397:            void lHideNativeResource() {
398:                // sync selected flags and selectedIndex
399:                // before any visible native resource is deleted.
400:                if (nativeId != DisplayableLFImpl.INVALID_NATIVE_ID) {
401:                    syncSelectedIndex();
402:                    syncSelectedFlags();
403:                }
404:
405:                // Hide native resource
406:                super .lHideNativeResource();
407:            }
408:
409:            /**
410:             * Creates and sets  native resource for current ChoiceGroup.
411:             * Override function in ItemLFImpl.
412:             * @param ownerId Owner screen's native resource id
413:             */
414:            void createNativeResource(int ownerId) {
415:                nativeId = createNativeResource0(ownerId, cg.label,
416:                        (cg.owner instanceof  List ? -1 : cg.layout),
417:                        cg.choiceType, cg.fitPolicy, cg.cgElements,
418:                        cg.numOfEls, selectedIndex);
419:            }
420:
421:            // *****************************************************
422:            //  Private methods
423:            // *****************************************************
424:
425:            /**
426:             * Read and save user selection from native resource.
427:             */
428:            private void syncSelectedIndex() {
429:                if (cg.choiceType != Choice.MULTIPLE) {
430:                    int newSelectedIndex = getSelectedIndex0(nativeId);
431:                    if (selectedIndex != newSelectedIndex) {
432:                        if (selectedIndex != -1) {
433:                            cg.cgElements[selectedIndex].setSelected(false);
434:                        }
435:                        selectedIndex = newSelectedIndex;
436:                        if (selectedIndex != -1) {
437:                            cg.cgElements[selectedIndex].setSelected(true);
438:                        }
439:                    }
440:                }
441:            }
442:
443:            /**
444:             * Read and save user selection from native resource.
445:             */
446:            private void syncSelectedFlags() {
447:                if (cg.numOfEls > 0 && cg.choiceType == Choice.MULTIPLE) {
448:                    boolean[] selectedArray_return = new boolean[cg.numOfEls];
449:
450:                    getSelectedFlags0(nativeId, selectedArray_return,
451:                            cg.numOfEls);
452:
453:                    for (int i = 0; i < cg.numOfEls; i++) {
454:                        cg.cgElements[i].setSelected(selectedArray_return[i]);
455:                    }
456:                }
457:            }
458:
459:            /**
460:             * KNI function that creates native resource for current ChoiceGroup.
461:             * @param ownerId Owner screen's native resource id (MidpDisplayable *)
462:             * @param label string to be used as label for this ChoiceGroup
463:             * @param layout layout directive associated with this <code>Item</code>
464:             * @param choiceType should be EXCLUSIVE, MULTIPLE, IMPLICIT, POPUP
465:             * @param fitPolicy should be TEXT_WRAP_DEFAULT, TEXT_WRAP_ON, or
466:             *                    TEXT_WRAP_OFF
467:             * @param cgElements array of CGElement that stores such data as
468:             *                   image, text, font, selection state per element
469:             * @param numChoices number of valid elements in cgElements array
470:             * @param selectedIndex index of a currently selected element
471:             *                      (has no meaning for MULTIPLE ChoiceGroup)
472:             * @return native resource id (MidpItem *) of this ChoiceGroup
473:             */
474:            private native int createNativeResource0(int ownerId, String label,
475:                    int layout, int choiceType, int fitPolicy,
476:                    CGElement[] cgElements, int numChoices, int selectedIndex);
477:
478:            /**
479:             * KNI function that notifies native resource of a new element
480:             * inserted prior to the element specified
481:             * 
482:             * @param nativeId native resource id (MidpItem *) of this ChoiceGroup
483:             * @param elementNum the index of an element where insertion is to occur
484:             * @param stringPart the string part of the element to be inserted
485:             * @param imagePart the image part of the element to be inserted
486:             * @param selected the selected state of the element to be inserted
487:             */
488:            private native void insert0(int nativeId, int elementNum,
489:                    String stringPart, ImageData imagePart, boolean selected);
490:
491:            /**
492:             * KNI function that notifies native resource of a specified element
493:             * being deleted in the corresponding ChoiceGroup.
494:             *
495:             * @param nativeId native resource id (MidpItem *) of this ChoiceGroup
496:             * @param elementNum the index of an element to be deleted
497:             * @param selectedIndex the index of an element to be selected after the
498:             *        deletion is done (has no meaning for MULTIPLE ChoiceGroup)
499:             */
500:            private native void delete0(int nativeId, int elementNum,
501:                    int selectedIndex);
502:
503:            /**
504:             * KNI function that notifies native resource that all elements were
505:             * deleted in the corresponding ChoiceGroup.
506:             *
507:             * @param nativeId native resource id (MidpItem *) of this ChoiceGroup
508:             */
509:            private native void deleteAll0(int nativeId);
510:
511:            /**
512:             * KNI function that notifies native resource of a specified element
513:             * being set in the corresponding ChoiceGroup.
514:             *
515:             * @param nativeId native resource id (MidpItem *) of this ChoiceGroup
516:             * @param elementNum the index of an element to be set
517:             * @param stringPart the string part of the element to be set
518:             * @param imagePart the image part of the element to be set
519:             * @param selected the selected state of the element to be set
520:             */
521:            private native void set0(int nativeId, int elementNum,
522:                    String stringPart, ImageData imagePart, boolean selected);
523:
524:            /**
525:             * KNI function that notifies native resource of an element's new selected
526:             * state in the corresponding ChoiceGroup.
527:             *
528:             * @param nativeId native resource id (MidpItem *) of this ChoiceGroup
529:             * @param elementNum the index of an element which selected state changed
530:             * @param selected the new selected state
531:             */
532:            private native void setSelectedIndex0(int nativeId, int elementNum,
533:                    boolean selected);
534:
535:            /**
536:             * KNI function that notifies native resource of new selected
537:             * states in the corresponding ChoiceGroup.
538:             *
539:             * @param nativeId native resource id (MidpItem *) of this ChoiceGroup
540:             * @param selectedArray array with new selected states
541:             * @param numSelectedArray number of elements in selectedArray to be used
542:             */
543:            private native void setSelectedFlags0(int nativeId,
544:                    boolean[] selectedArray, int numSelectedArray);
545:
546:            /**
547:             * KNI function that notifies native resource of fit policy change
548:             * in the corresponding ChoiceGroup.
549:             *
550:             * @param nativeId native resource id (MidpItem *) of this ChoiceGroup
551:             * @param fitPolicy new fit policy (can be TEXT_WRAP_OFF, TEXT_WRAP_ON,
552:             *                  or TEXT_WRAP_DEFAULT)
553:             */
554:            private native void setFitPolicy0(int nativeId, int fitPolicy);
555:
556:            /**
557:             * KNI function that notifies native resource of an element's new font
558:             * setting in the corresponding ChoiceGroup.
559:             *
560:             * @param nativeId native resource id (MidpItem *) of this ChoiceGroup
561:             * @param elementNum the index of an element which font has changed
562:             * @param face of the newly set font
563:             * @param style of the newly set font 
564:             * @param size of newly set font
565:             */
566:            private native void setFont0(int nativeId, int elementNum,
567:                    int face, int style, int size);
568:
569:            /**
570:             * KNI function that gets index of a currently selected index from 
571:             * the ChoiceGroup's native resource.
572:             *
573:             * @param nativeId native resource id (MidpItem *) of this ChoiceGroup
574:             * @return index of the currently selected element
575:             */
576:            private native int getSelectedIndex0(int nativeId);
577:
578:            /**
579:             * KNI function that queries the state of all elements in the native
580:             * resource and returns it in the passed in selectedArray array.
581:             *
582:             * @param nativeId native resource id (MidpItem *) of this ChoiceGroup
583:             * @param selectedArray to contain the results
584:             * @param numOfEls number of elements in selectedArray
585:             * @return the number of elements selected in the native resource
586:             */
587:            private native int getSelectedFlags0(int nativeId,
588:                    boolean[] selectedArray, int numOfEls);
589:
590:            /**
591:             * KNI function that queries the state of an element in the native
592:             * resource
593:             *
594:             * @param nativeId native resource id (MidpItem *) of this ChoiceGroup
595:             * @param elementNum the index of an element which state is queried
596:             * @return the current state of an element in the nativer resource
597:             */
598:            private native boolean isSelected0(int nativeId, int elementNum);
599:
600:            /** ChoiceGroup associated with this ChoiceGroupLF. */
601:            ChoiceGroup cg;
602:
603:            /**
604:             * The currently selected index of this ChoiceGroup (-1 by default).
605:             */
606:            int selectedIndex = -1;
607:        }
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