summaryrefslogtreecommitdiff
path: root/framework/Web/UI/WebControls/TDataBoundControl.php
blob: b729438335faed5869a9a8149d9b6f1030c43c75 (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
<?php
/**
 * TDataBoundControl class file
 *
 * @author Qiang Xue <qiang.xue@gmail.com>
 * @link http://www.pradosoft.com/
 * @copyright Copyright &copy; 2005 PradoSoft
 * @license http://www.pradosoft.com/license/
 * @version $Revision: $  $Date: $
 * @package System.Web.UI.WebControls
 */

Prado::using('System.Web.UI.WebControls.TDataSourceControl');
Prado::using('System.Web.UI.WebControls.TDataSourceView');

/**
 * TDataBoundControl class.
 *
 * TDataBoundControl is the based class for controls that need to populate
 * data from data sources. It provides basic properties and methods that allow
 * the derived controls to associate with data sources and retrieve data from them.
 *
 * TBC...
 *
 * @author Qiang Xue <qiang.xue@gmail.com>
 * @version $Revision: $  $Date: $
 * @package System.Web.UI.WebControls
 * @since 3.0
 */
abstract class TDataBoundControl extends TWebControl
{
	private $_initialized=false;
	private $_dataSource=null;
	private $_requiresBindToNull=false;
	private $_requiresDataBinding=false;
	private $_prerendered=false;
	private $_currentView=null;
	private $_currentDataSource=null;
	private $_currentViewValid=false;
	private $_currentDataSourceValid=false;
	private $_currentViewIsFromDataSourceID=false;
	private $_parameters=null;
	private $_isDataBound=false;

	/**
	 * @return Traversable data source object, defaults to null.
	 */
	public function getDataSource()
	{
		return $this->_dataSource;
	}

	/**
	 * Sets the data source object associated with the databound control.
	 * The data source must implement Traversable interface.
	 * If an array is given, it will be converted to xxx.
	 * If a string is given, it will be converted to xxx.
	 * @param Traversable|array|string data source object
	 */
	public function setDataSource($value)
	{
		$this->_dataSource=$this->validateDataSource($value);;
		$this->onDataSourceChanged();
	}

	/**
	 * @return string ID path to the data source control. Defaults to empty.
	 */
	public function getDataSourceID()
	{
		return $this->getViewState('DataSourceID','');
	}

	/**
	 * @param string ID path to the data source control. The data source
	 * control must be locatable via {@link TControl::findControl} call.
	 */
	public function setDataSourceID($value)
	{
		$dsid=$this->getViewState('DataSourceID','');
		if($dsid!=='' && $value==='')
			$this->_requiresBindToNull=true;
		$this->setViewState('DataSourceID',$value,'');
		$this->onDataSourceChanged();
	}

	/**
	 * @return boolean if the databound control uses the data source specified
	 * by {@link setDataSourceID}, or it uses the data source object specified
	 * by {@link setDataSource}.
	 */
	protected function getUsingDataSourceID()
	{
		return $this->getDataSourceID()!=='';
	}

	/**
	 * Sets {@link setRequiresDataBinding RequiresDataBinding} as true if the control is initialized.
	 * This method is invoked when either {@link setDataSource} or {@link setDataSourceID} is changed.
	 */
	public function onDataSourceChanged()
	{
		$this->_currentViewValid=false;
		$this->_currentDataSourceValid=false;
		if($this->getInitialized())
			$this->setRequiresDataBinding(true);
	}

	/**
	 * @return boolean whether the databound control has been initialized.
	 * By default, the control is initialized after its viewstate has been restored.
	 */
	protected function getInitialized()
	{
		return $this->_initialized;
	}

	/**
	 * Sets a value indicating whether the databound control is initialized.
	 * If initialized, any modification to {@link setDataSource DataSource} or
	 * {@link setDataSourceID DataSourceID} will set {@link setRequiresDataBinding RequiresDataBinding}
	 * as true.
	 * @param boolean a value indicating whether the databound control is initialized.
	 */
	protected function setInitialized($value)
	{
		$this->_initialized=TPropertyValue::ensureBoolean($value);
	}

	/**
	 * @return boolean if databind has been invoked in the previous page request
	 */
	protected function getIsDataBound()
	{
		return $this->_isDataBound;
	}

	/**
	 * @param boolean if databind has been invoked in this page request
	 */
	protected function setIsDataBound($value)
	{
		$this->_isDataBound=$value;
	}

	/**
	 * @return boolean whether a databind call is required (by the data bound control)
	 */
	protected function getRequiresDataBinding()
	{
		return $this->_requiresDataBinding;
	}

	/**
	 * Sets a value indicating whether a databind call is required by the data bound control.
	 * If true and the control has been prerendered while it uses the data source
	 * specified by {@link setDataSourceID}, a databind call will be called by this method.
	 * @param boolean whether a databind call is required.
	 */
	protected function setRequiresDataBinding($value)
	{
		$value=TPropertyValue::ensureBoolean($value);
		if($value && $this->_prerendered)
		{
			$this->_requiresDataBinding=true;
			$this->ensureDataBound();
		}
		else
			$this->_requiresDataBinding=$value;
	}

	/**
	 * Ensures any pending {@link dataBind} is called.
	 * This method calls {@link dataBind} if the data source is specified
	 * by {@link setDataSourceID} or if {@link getRequiresDataBinding RequiresDataBinding}
	 * is true.
	 */
	protected function ensureDataBound()
	{
		if($this->_requiresDataBinding && ($this->getUsingDataSourceID() || $this->_requiresBindToNull))
		{
			$this->dataBind();
			$this->_requiresBindToNull=false;
		}
	}

	/**
	 * Performs databinding.
	 * This method overrides the parent implementation by calling
	 * {@link performSelect} which fetches data from data source and does
	 * the actual binding work.
	 */
	public function dataBind()
	{
		$this->setRequiresDataBinding(false);
		$this->dataBindProperties();
		$this->onDataBinding(null);
		$data=$this->getData();
		$this->performDataBinding($data);
		$this->setIsDataBound(true);
		$this->onDataBound(null);
	}

	public function dataSourceViewChanged($sender,$param)
	{
		if(!$this->_ignoreDataSourceViewChanged)
			$this->setRequiresDataBinding(true);
	}

	protected function getData()
	{
		if(($view=$this->getDataSourceView())!==null)
			return $view->select($this->getSelectParameters());
		else
			return null;
	}

	protected function getDataSourceView()
	{
		if(!$this->_currentViewValid)
		{
			if($this->_currentView && $this->_currentViewIsFromDataSourceID)
				$this->_currentView->detachEventHandler('DataSourceViewChanged',array($this,'dataSourceViewChanged'));
			if(($dataSource=$this->determineDataSource())!==null)
			{
				if(($view=$dataSource->getView($this->getDataMember()))===null)
					throw new TInvalidDataValueException('databoundcontrol_datamember_invalid',$this->getDataMember());
				if($this->_currentViewIsFromDataSourceID=$this->getUsingDataSourceID())
					$view->attachEventHandler('OnDataSourceViewChanged',array($this,'dataSourceViewChanged'));
				$this->_currentView=$view;
			}
			else
				$this->_currentView=null;
			$this->_currentViewValid=true;
		}
		return $this->_currentView;
	}

	protected function determineDataSource()
	{
		if(!$this->_currentDataSourceValid)
		{
			if(($dsid=$this->getDataSourceID())!=='')
			{
				if(($dataSource=$this->getNamingContainer()->findControl($dsid))===null)
					throw new TInvalidDataValueException('databoundcontrol_datasourceid_inexistent',$dsid);
				else if(!($dataSource instanceof IDataSource))
					throw new TInvalidDataValueException('databoundcontrol_datasourceid_invalid',$dsid);
				else
					$this->_currentDataSource=$dataSource;
			}
			else if(($dataSource=$this->getDataSource())!==null)
				$this->_currentDataSource=new TReadOnlyDataSource($dataSource,$this->getDataMember());
			else
				$this->_currentDataSource=null;
			$this->_currentDataSourceValid=true;
		}
		return $this->_currentDataSource;
	}

	abstract protected function performDataBinding($data);

	/**
	 * Raises <b>OnDataBound</b> event.
	 * This method should be invoked after a databind is performed.
	 * It is mainly used by framework and component developers.
	 */
	public function onDataBound($param)
	{
		$this->raiseEvent('OnDataBound',$this,$param);
	}

	/**
	 * Sets page's <b>OnPreLoad</b> event handler as {@link onPagePreLoad}.
	 * If viewstate is disabled and the current request is a postback,
	 * {@link setRequiresDataBinding RequiresDataBinding} will be set true.
	 * This method overrides the parent implementation.
	 * @param TEventParameter event parameter
	 */
	public function onInit($param)
	{
		parent::onInit($param);
		$page=$this->getPage();
		$page->attachEventHandler('OnPreLoad',array($this,'onPagePreLoad'));
	}

	/**
	 * Sets {@link getInitialized} as true.
	 * This method is invoked when page raises <b>PreLoad</b> event.
	 * @param mixed event sender
	 * @param TEventParameter event parameter
	 */
	public function onPagePreLoad($sender,$param)
	{
		$this->_initialized=true;
		$isPostBack=$this->getPage()->getIsPostBack();
		if(!$isPostBack || ($isPostBack && (!$this->getEnableViewState(true) || !$this->getIsDataBound())))
			$this->setRequiresDataBinding(true);
	}

	/**
	 * Ensures any pending databind is performed.
	 * This method overrides the parent implementation.
	 * @param TEventParameter event parameter
	 */
	public function onPreRender($param)
	{
		$this->_prerendered=true;
		$this->ensureDataBound();
		parent::onPreRender($param);
	}

	/**
	 * Validates if the parameter is a valid data source.
	 * If it is a string or an array, it will be converted as a TList object.
	 * @return Traversable the data that is traversable
	 * @throws TInvalidDataTypeException if the data is neither null nor Traversable
	 */
	protected function validateDataSource($value)
	{
		if(is_string($value))
		{
			$list=new TList;
			foreach(TPropertyValue::ensureArray($value) as $key=>$value)
			{
				if(is_array($value))
					$list->add($value);
				else
					$list->add(array($value,is_string($key)?$key:$value));
			}
			return $list;
		}
		else if(is_array($value))
			return new TMap($value);
		else if(($value instanceof Traversable) || $value===null)
			return $value;
		else
			throw new TInvalidDataTypeException('databoundcontrol_datasource_invalid');
	}

	public function getDataMember()
	{
		return $this->getViewState('DataMember','');
	}

	public function setDataMember($value)
	{
		$this->setViewState('DataMember',$value,'');
	}

	public function getSelectParameters()
	{
		if(!$this->_parameters)
			$this->_parameters=new TDataSourceSelectParameters;
		return $this->_parameters;
	}
}

?>