summaryrefslogtreecommitdiff
path: root/framework/Web/UI/WebControls/TAccordion.php
blob: 7d5b20fa5a1ad214c5f31e9a00035a5f5351736a (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
<?php
/**
 * TAccordion class file.
 *
 * @author Gabor Berczi, DevWorx Hungary <gabor.berczi@devworx.hu>
 * @link http://www.pradosoft.com/
 * @copyright Copyright &copy; 2005-2013 PradoSoft
 * @license http://www.pradosoft.com/license/
 * @version $Id: TAccordion.php 2915 2011-05-15 16:26:11Z ctrlaltca@gmail.com $
 * @package System.Web.UI.WebControls
 * @since 3.2
 */

/**
 * Class TAccordion.
 *
 * TAccordion displays an accordion control. Users can click on the view headers to switch among
 * different accordion views. Each accordion view is an independent panel that can contain arbitrary content.
 *
 * A TAccordion control consists of one or several {@link TAccordionView} controls representing the possible
 * accordion views. At any time, only one accordion view is visible (active), which is specified by any of
 * the following properties:
 * - {@link setActiveViewIndex ActiveViewIndex} - the zero-based integer index of the view in the view collection.
 * - {@link setActiveViewID ActiveViewID} - the text ID of the visible view.
 * - {@link setActiveView ActiveView} - the visible view instance.
 * If both {@link setActiveViewIndex ActiveViewIndex} and {@link setActiveViewID ActiveViewID}
 * are set, the latter takes precedence.
 *
 * TAccordion uses CSS to specify the appearance of the accordion headers and panel. By default,
 * an embedded CSS file will be published which contains the default CSS for TTabPanel.
 * You may also use your own CSS file by specifying the {@link setCssUrl CssUrl} property.
 * The following properties specify the CSS classes used for elements in a TAccordion:
 * - {@link setCssClass CssClass} - the CSS class name for the outer-most div element (defaults to 'accordion');
 * - {@link setHeaderCssClass HeaderCssClass} - the CSS class name for nonactive accordion div elements (defaults to 'accordion-header');
 * - {@link setActiveHeaderCssClass ActiveHeaderCssClass} - the CSS class name for the active accordion div element (defaults to 'accordion-header-active');
 * - {@link setViewCssClass ViewCssClass} - the CSS class for the div element enclosing view content (defaults to 'accordion-view');
 *
 * When the user clicks on a view header, the switch between the old visible view and the clicked one is animated.
 * You can use the {@link setAnimationDuration AnimationDuration} property to set the animation length in seconds;
 * it defaults to 1 second, and when set to 0 it will produce an immediate switch with no animation.
 *
 * The TAccordion auto-sizes itself to the largest of all views, so it can encompass all of them without scrolling.
 * If you want to specify a fixed height (in pixels), use the {@link setViewHeight ViewHeight} property.
 * When a TAccordion is nested inside another, it's adviced to manually specify a {@link setViewHeight ViewHeight} for the internal TAccordion
 *
 * To use TAccordion, write a template like following:
 * <code>
 * <com:TAccordion>
 *   <com:TAccordionView Caption="View 1">
 *     content for view 1
 *   </com:TAccordionView>
 *   <com:TAccordionView Caption="View 2">
 *     content for view 2
 *   </com:TAccordionView>
 *   <com:TAccordionView Caption="View 3">
 *     content for view 3
 *   </com:TAccordionView>
 * </com:TAccordion>
 * </code>
 *
 * @author Gabor Berczi, DevWorx Hungary <gabor.berczi@devworx.hu>
 * @version $Id: TAccordion.php 2915 2011-05-15 16:26:11Z ctrlaltca@gmail.com $
 * @package System.Web.UI.WebControls
 * @since 3.2
 */

class TAccordion extends TWebControl implements IPostBackDataHandler
{
	private $_dataChanged=false;

	/**
	 * @return string tag name for the control
	 */
	protected function getTagName()
	{
		return 'div';
	}

	/**
	 * Adds object parsed from template to the control.
	 * This method adds only {@link TAccordionView} objects into the {@link getViews Views} collection.
	 * All other objects are ignored.
	 * @param mixed object parsed from template
	 */
	public function addParsedObject($object)
	{
		if($object instanceof TAccordionView)
			$this->getControls()->add($object);
	}

	/**
	 * Returns the index of the active accordion view.
	 * Note, this property may not return the correct index.
	 * To ensure the correctness, call {@link getActiveView()} first.
	 * @return integer the zero-based index of the active accordion view. If -1, it means no active accordion view. Default is 0 (the first view is active).
	 */
	public function getActiveViewIndex()
	{
		return $this->getViewState('ActiveViewIndex',0);
	}

	/**
	 * @param integer the zero-based index of the current view in the view collection. -1 if no active view.
	 * @throws TInvalidDataValueException if the view index is invalid
	 */
	public function setActiveViewIndex($value)
	{
		$this->setViewState('ActiveViewIndex',TPropertyValue::ensureInteger($value),0);
	}

	/**
	 * Returns the ID of the active accordion view.
	 * Note, this property may not return the correct ID.
	 * To ensure the correctness, call {@link getActiveView()} first.
	 * @return string The ID of the active accordion view. Defaults to '', meaning not set.
	 */
	public function getActiveViewID()
	{
		return $this->getViewState('ActiveViewID','');
	}

	/**
	 * @param string The ID of the active accordion view.
	 */
	public function setActiveViewID($value)
	{
		$this->setViewState('ActiveViewID',$value,'');
	}

	/**
	 * Returns the currently active view.
	 * This method will examin the ActiveViewID, ActiveViewIndex and Views collection to
	 * determine which view is currently active. It will update ActiveViewID and ActiveViewIndex accordingly.
	 * @return TAccordionView the currently active view, null if no active view
	 * @throws TInvalidDataValueException if the active view ID or index set previously is invalid
	 */
	public function getActiveView()
	{
		$activeView=null;
		$views=$this->getViews();
		if(($id=$this->getActiveViewID())!=='')
		{
			if(($index=$views->findIndexByID($id))>=0)
				$activeView=$views->itemAt($index);
			else
				throw new TInvalidDataValueException('tabpanel_activeviewid_invalid',$id);
		}
		else if(($index=$this->getActiveViewIndex())>=0)
		{
			if($index<$views->getCount())
				$activeView=$views->itemAt($index);
			else
				throw new TInvalidDataValueException('tabpanel_activeviewindex_invalid',$index);
		}
		else
		{
			foreach($views as $index=>$view)
			{
				if($view->getActive())
				{
					$activeView=$view;
					break;
				}
			}
		}
		if($activeView!==null)
			$this->activateView($activeView);
		return $activeView;
	}

	/**
	 * @param TAccordionView the view to be activated
	 * @throws TInvalidOperationException if the view is not in the view collection
	 */
	public function setActiveView($view)
	{
		if($this->getViews()->indexOf($view)>=0)
			$this->activateView($view);
		else
			throw new TInvalidOperationException('tabpanel_view_inexistent');
	}

	/**
	* @return string URL for the CSS file including all relevant CSS class definitions. Defaults to ''.
	*/
	public function getCssUrl()
	{
		return $this->getViewState('CssUrl','default');
	}

	/**
	* @param string URL for the CSS file including all relevant CSS class definitions.
	*/
	public function setCssUrl($value)
	{
		$this->setViewState('CssUrl',TPropertyValue::ensureString($value),'');
	}

	/**
		* @return string CSS class for the whole accordion control div. 
	*/
	public function getCssClass()
	{
		$cssClass=parent::getCssClass();
			return $cssClass===''?'accordion':$cssClass;
	}

	/**
		* @return string CSS class for the currently displayed view div. Defaults to 'accordion-view'.
	*/
	public function getViewCssClass()
	{
		return $this->getViewStyle()->getCssClass();
	}

	/**
	* @param string CSS class for the currently displayed view div.
	*/
	public function setViewCssClass($value)
	{
		$this->getViewStyle()->setCssClass($value);
	}

	/**
		* @return string CSS class for the currently displayed view div. Defaults to 'accordion-view'.
	*/
	public function getAnimationDuration()
	{
		return $this->getViewState('AnimationDuration','1');
	}

	/**
	* @param string CSS class for the currently displayed view div.
	*/
	public function setAnimationDuration($value)
	{
		$this->setViewState('AnimationDuration',$value);
	}

	/**
	 * @return TStyle the style for all the view div
	 */
	public function getViewStyle()
	{
		if(($style=$this->getViewState('ViewStyle',null))===null)
		{
			$style=new TStyle;
			$style->setCssClass('accordion-view');
			$this->setViewState('ViewStyle',$style,null);
		}
		return $style;
	}

	/**
	 * @return string CSS class for view headers. Defaults to 'accordion-header'.
	 */
	public function getHeaderCssClass()
	{
		return $this->getHeaderStyle()->getCssClass();
	}

	/**
	 * @param string CSS class for view headers.
	 */
	public function setHeaderCssClass($value)
	{
		$this->getHeaderStyle()->setCssClass($value);
	}

	/**
	 * @return TStyle the style for all the inactive header div
	 */
	public function getHeaderStyle()
	{
		if(($style=$this->getViewState('HeaderStyle',null))===null)
		{
			$style=new TStyle;
			$style->setCssClass('accordion-header');
			$this->setViewState('HeaderStyle',$style,null);
		}
		return $style;
	}

	/**
	 * @return string Extra CSS class for the active header. Defaults to 'accordion-header-active'.
	 */
	public function getActiveHeaderCssClass()
	{
		return $this->getActiveHeaderStyle()->getCssClass();
	}

	/**
	 * @param string Extra CSS class for the active header. Will be added to the normal header specified by HeaderCssClass.
	 */
	public function setActiveHeaderCssClass($value)
	{
		$this->getActiveHeaderStyle()->setCssClass($value);
	}

	/**
	 * @return TStyle the style for the active header div
	 */
	public function getActiveHeaderStyle()
	{
		if(($style=$this->getViewState('ActiveHeaderStyle',null))===null)
		{
			$style=new TStyle;
			$style->setCssClass('accordion-header-active');
			$this->setViewState('ActiveHeaderStyle',$style,null);
		}
		return $style;
	}

	/**
	 * @return integer Maximum height for the accordion views. If non specified, the accordion will auto-sized to the largest of all views, so it can encompass all of them without scrolling
	 */
	public function getViewHeight()
	{
		return TPropertyValue::ensureInteger($this->getViewState('ViewHeight'));
	}

	/**
	 * @param integer Maximum height for the accordion views. If any of the accordion's views' content is larger, those views will be made scrollable when activated
	 */
	public function setViewHeight($value)
	{
		$this->setViewState('ViewHeight', TPropertyValue::ensureInteger($value));
	}

	/**
	 * Activates the specified view.
	 * If there is any other view currently active, it will be deactivated.
	 * @param TAccordionView the view to be activated. If null, all views will be deactivated.
	 */
	protected function activateView($view)
	{
		$this->setActiveViewIndex(-1);
		$this->setActiveViewID('');
		foreach($this->getViews() as $index=>$v)
		{
			if($view===$v)
			{
				$this->setActiveViewIndex($index);
				$this->setActiveViewID($view->getID(false));
				$view->setActive(true);
			}
			else
				$v->setActive(false);
		}
	}

	/**
	 * Loads user input data.
	 * This method is primarly used by framework developers.
	 * @param string the key that can be used to retrieve data from the input data collection
	 * @param array the input data collection
	 * @return boolean whether the data of the control has been changed
	 */
	public function loadPostData($key,$values)
	{
		if(($index=$values[$this->getClientID().'_1'])!==null)
		{
			$index=(int)$index;
			$currentIndex=$this->getActiveViewIndex();
			if($currentIndex!==$index)
			{
				$this->setActiveViewID(''); // clear up view ID
				$this->setActiveViewIndex($index);
				return $this->_dataChanged=true;
			}
		}
		return false;
	}

	/**
	 * Raises postdata changed event.
	 * This method is required by {@link IPostBackDataHandler} interface.
	 * It is invoked by the framework when {@link getActiveViewIndex ActiveViewIndex} property
	 * is changed on postback.
	 * This method is primarly used by framework developers.
	 */
	public function raisePostDataChangedEvent()
	{
		// do nothing
	}

	/**
	 * Returns a value indicating whether postback has caused the control data change.
	 * This method is required by the IPostBackDataHandler interface.
	 * @return boolean whether postback has caused the control data change. False if the page is not in postback mode.
	 */
	public function getDataChanged()
	{
		return $this->_dataChanged;
	}

	/**
	 * Adds attributes to renderer.
	 * @param THtmlWriter the renderer
	 */
	protected function addAttributesToRender($writer)
	{
		$writer->addAttribute('id',$this->getClientID());
		$this->setCssClass($this->getCssClass());
		parent::addAttributesToRender($writer);
	}

	/**
	 * Registers CSS and JS.
	 * This method is invoked right before the control rendering, if the control is visible.
	 * @param mixed event parameter
	 */
	public function onPreRender($param)
	{
		parent::onPreRender($param);
		$this->getActiveView();  // determine the active view
		$this->registerStyleSheet();
	}

	/**
	 * Registers the CSS relevant to the TAccordion.
	 * It will register the CSS file specified by {@link getCssUrl CssUrl}.
	 * If that is not set, it will use the default CSS.
	 */
	protected function registerStyleSheet()
	{
		$url = $this->getCssUrl();
		
		if($url === '') {
			return;
		}
		
		if($url === 'default') {
			$url = $this->getApplication()->getAssetManager()->publishFilePath(dirname(__FILE__).DIRECTORY_SEPARATOR.'assets'.DIRECTORY_SEPARATOR.'accordion.css');
		}
		
		if($url !== '') {
			$this->getPage()->getClientScript()->registerStyleSheetFile($url, $url);
		}
	}

	/**
	 * Registers the relevant JavaScript.
	 */
	protected function registerClientScript()
	{
		$id=$this->getClientID();
		$options=TJavaScript::encode($this->getClientOptions());
		$className=$this->getClientClassName();
		$page=$this->getPage();
		$cs=$page->getClientScript();
		$cs->registerPradoScript('accordion');
		$code="new $className($options);";
		$cs->registerEndScript("prado:$id", $code);
		// ensure an item is always active and visible
		$index = $this->getActiveViewIndex();
		if(!$this->getViews()->itemAt($index)->Visible)
			$index=0;
		$cs->registerHiddenField($id.'_1', $index);
		$page->registerRequiresPostData($this);
		$page->registerRequiresPostData($id."_1");
	}

	/**
	 * Gets the name of the javascript class responsible for performing postback for this control.
	 * This method overrides the parent implementation.
	 * @return string the javascript class name
	 */
	protected function getClientClassName()
	{
		return 'Prado.WebUI.TAccordion';
	}

	/**
	 * @return array the options for JavaScript
	 */
	protected function getClientOptions()
	{
		$options['ID'] = $this->getClientID();
		$options['ActiveHeaderCssClass'] = $this->getActiveHeaderCssClass();
		$options['HeaderCssClass'] = $this->getHeaderCssClass();
		$options['Duration'] = $this->getAnimationDuration();

		if (($viewheight = $this->getViewHeight())>0)
			$options['maxHeight'] = $viewheight;
		$views = array();
		foreach($this->getViews() as $view)
			$views[$view->getClientID()] = $view->getVisible() ? '1': '0';
		$options['Views'] = $views;

		return $options;
	}

	/**
	 * Creates a control collection object that is to be used to hold child controls
	 * @return TAccordionViewCollection control collection
	 */
	protected function createControlCollection()
	{
		return new TAccordionViewCollection($this);
	}

	/**
	 * @return TAccordionViewCollection list of {@link TAccordionView} controls
	 */
	public function getViews()
	{
		return $this->getControls();
	}

	public function render($writer)
	{
		$this->registerClientScript();
		parent::render($writer);
	}

	/**
	 * Renders body contents of the accordion control.
	 * @param THtmlWriter the writer used for the rendering purpose.
	 */
	public function renderContents($writer)
	{
		$views=$this->getViews();
		if($views->getCount()>0)
		{
			$writer->writeLine();
			foreach($views as $view)
			{
				$view->renderHeader($writer);
				$view->renderControl($writer);
				$writer->writeLine();
			}
		}
	}

}

/**
 * Class TAccordionView.
 *
 * TAccordionView represents a single view in a {@link TAccordion}.
 * 
 * TAccordionView is represented inside the {@link TAccordion} with an header label whose text is defined by
 * the {@link setCaption Caption} property; optionally the label can be an hyperlink: use the
 * {@link setNavigateUrl NavigateUrl} property to define the destination url.
 *
 * @author Gabor Berczi, DevWorx Hungary <gabor.berczi@devworx.hu>
 * @version $Id: TAccordion.php 2915 2011-05-15 16:26:11Z ctrlaltca@gmail.com $
 * @package System.Web.UI.WebControls
 * @since 3.2
 */
class TAccordionView extends TWebControl
{
	private $_active=false;

	/**
	 * @return the tag name for the view element
	 */
	protected function getTagName()
	{
		return 'div';
	}

	/**
	 * Adds attributes to renderer.
	 * @param THtmlWriter the renderer
	 */
	protected function addAttributesToRender($writer)
	{
		if(!$this->getActive() && $this->getPage()->getClientSupportsJavaScript())
			$this->getStyle()->setStyleField('display','none');

		$this->getStyle()->mergeWith($this->getParent()->getViewStyle());

		parent::addAttributesToRender($writer);

		$writer->addAttribute('id',$this->getClientID());
	}

	/**
	 * @return string the caption displayed on this header. Defaults to ''.
	 */
	public function getCaption()
	{
		return $this->getViewState('Caption','');
	}

	/**
	 * @param string the caption displayed on this header
	 */
	public function setCaption($value)
	{
		$this->setViewState('Caption',TPropertyValue::ensureString($value),'');
	}

	/**
	 * @return string the URL of the target page. Defaults to ''.
	 */
	public function getNavigateUrl()
	{
		return $this->getViewState('NavigateUrl','');
	}

	/**
	 * Sets the URL of the target page.
	 * If not empty, clicking on this header will redirect the browser to the specified URL.
	 * @param string the URL of the target page.
	 */
	public function setNavigateUrl($value)
	{
		$this->setViewState('NavigateUrl',TPropertyValue::ensureString($value),'');
	}

	/**
	 * @return string the text content displayed on this view. Defaults to ''.
	 */
	public function getText()
	{
		return $this->getViewState('Text','');
	}

	/**
	 * Sets the text content to be displayed on this view.
	 * If this is not empty, the child content of the view will be ignored.
	 * @param string the text content displayed on this view
	 */
	public function setText($value)
	{
		$this->setViewState('Text',TPropertyValue::ensureString($value),'');
	}

	/**
	 * @return boolean whether this accordion view is active. Defaults to false.
	 */
	public function getActive()
	{
		return $this->_active;
	}

	/**
	 * @param boolean whether this accordion view is active.
	 */
	public function setActive($value)
	{
		$this->_active=TPropertyValue::ensureBoolean($value);
	}

	/**
	 * Renders body contents of the accordion view.
	 * @param THtmlWriter the writer used for the rendering purpose.
	 */
	public function renderContents($writer)
	{
		if(($text=$this->getText())!=='')
			$writer->write($text);
		else if($this->getHasControls())
			parent::renderContents($writer);
	}

	/**
	 * Renders the header associated with the accordion view.
	 * @param THtmlWriter the writer for rendering purpose.
	 */
	public function renderHeader($writer)
	{
		if($this->getVisible(false) && $this->getPage()->getClientSupportsJavaScript())
		{
			$writer->addAttribute('id',$this->getClientID().'_0');

			$style=$this->getActive()?$this->getParent()->getActiveHeaderStyle():$this->getParent()->getHeaderStyle();
			
			$style->addAttributesToRender($writer);

			$writer->renderBeginTag($this->getTagName());

			$this->renderHeaderContent($writer);

			$writer->renderEndTag();
		}
	}

	/**
	 * Renders the content in the header.
	 * By default, a hyperlink is displayed.
	 * @param THtmlWriter the HTML writer
	 */
	protected function renderHeaderContent($writer)
	{
		$url = $this->getNavigateUrl();
		if(($caption=$this->getCaption())==='')
			$caption='&nbsp;';
			
		if ($url!='')
			$writer->write("<a href=\"{$url}\">");
		$writer->write("{$caption}");
		if ($url!='')
			$writer->write("</a>");
	}
}

/**
 * Class TAccordionViewCollection.
 *
 * TAccordionViewCollection is a collection of {@link TAccordionView} to be used inside a {@link TAccordion}.
 * 
 * @author Gabor Berczi, DevWorx Hungary <gabor.berczi@devworx.hu>
 * @version $Id: TAccordion.php 2915 2011-05-15 16:26:11Z ctrlaltca@gmail.com $
 * @package System.Web.UI.WebControls
 * @since 3.2
 */
class TAccordionViewCollection extends TControlCollection
{
	/**
	 * Inserts an item at the specified position.
	 * This overrides the parent implementation by performing sanity check on the type of new item.
	 * @param integer the speicified position.
	 * @param mixed new item
	 * @throws TInvalidDataTypeException if the item to be inserted is not a {@link TAccordionView} object.
	 */
	public function insertAt($index,$item)
	{
		if($item instanceof TAccordionView)
			parent::insertAt($index,$item);
		else
			throw new TInvalidDataTypeException('tabviewcollection_tabview_required');
	}

	/**
	 * Finds the index of the accordion view whose ID is the same as the one being looked for.
	 * @param string the explicit ID of the accordion view to be looked for
	 * @return integer the index of the accordion view found, -1 if not found.
	 */
	public function findIndexByID($id)
	{
		foreach($this as $index=>$view)
		{
			if($view->getID(false)===$id)
				return $index;
		}
		return -1;
	}
}