summaryrefslogtreecommitdiff
path: root/framework/Web/UI/ActiveControls/TActiveDropDownList.php
blob: 9c49db6e478c97557d2e5544058170f71721f3f4 (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
<?php
/**
 * TActiveDropDownList class file.
 *
 * @author Wei Zhuo <weizhuo[at]gamil[dot]com>
 * @link http://www.pradosoft.com/
 * @copyright Copyright &copy; 2005-2014 PradoSoft
 * @license http://www.pradosoft.com/license/
 * @version $Id: TActiveDropDownList.php 3245 2013-01-07 20:23:32Z ctrlaltca $
 * @package System.Web.UI.ActiveControls
 */

/**
 * Load active list control adapter
 */
Prado::using('System.Web.UI.ActiveControls.TActiveListControlAdapter');

/**
 * TActiveDropDownList class.
 *
 * The active control counter part to drop down list control.
 * The {@link setAutoPostBack AutoPostBack} property is set to true by default.
 * Thus, when the drop down list selection is changed the {@link onCallback OnCallback} event is
 * raised after {@link OnSelectedIndexChanged} event.
 *
 * With {@link TBaseActiveControl::setEnableUpdate() ActiveControl.EnableUpdate}
 * set to true (default is true), changes to the selection, <b>after</b> OnLoad event has
 * been raised, will be updated.
 * on the client side.
 *
 * List items can be changed dynamically during a callback request.
 *
 * @author Wei Zhuo <weizhuo[at]gmail[dot]com>
 * @version $Id: TActiveDropDownList.php 3245 2013-01-07 20:23:32Z ctrlaltca $
 * @package System.Web.UI.ActiveControls
 * @since 3.1
 */
class TActiveDropDownList extends TDropDownList implements ICallbackEventHandler, IActiveControl
{
	/**
	 * Creates a new callback control, sets the adapter to
	 * TActiveListControlAdapter. If you override this class, be sure to set the
	 * adapter appropriately by, for example, by calling this constructor.
	 */
	public function __construct()
	{
		parent::__construct();
		$this->setAdapter(new TActiveListControlAdapter($this));
		$this->setAutoPostBack(true);
	}

	/**
	 * @return TBaseActiveCallbackControl standard callback control options.
	 */
	public function getActiveControl()
	{
		return $this->getAdapter()->getBaseActiveControl();
	}

	/**
	 * @return TCallbackClientSide client side request options.
	 */
	public function getClientSide()
	{
		return $this->getAdapter()->getBaseActiveControl()->getClientSide();
	}

	/**
	 * No client class for this control.
	 * This method overrides the parent implementation.
	 * @return null no javascript class name.
	 */
	protected function getClientClassName()
	{
		return 'Prado.WebUI.TActiveDropDownList';
	}

	/**
	 * Creates a collection object to hold list items. A specialized
	 * TActiveListItemCollection is created to allow the drop down list options
	 * to be added.
	 * This method may be overriden to create a customized collection.
	 * @return TActiveListItemCollection the collection object
	 */
	protected function createListItemCollection()
	{
		$collection  = new TActiveListItemCollection;
		$collection->setControl($this);
		return $collection;
	}

	/**
	 * Override parent implementation, no javascript is rendered here instead
	 * the javascript required for active control is registered in {@link addAttributesToRender}.
	 */
	protected function renderClientControlScript($writer)
	{
	}

	/**
	 * Ensure that the ID attribute is rendered and registers the javascript code
	 * for initializing the active control.
	 */
	protected function addAttributesToRender($writer)
	{
		parent::addAttributesToRender($writer);
		$writer->addAttribute('id',$this->getClientID());
		if ($this->getAutoPostBack())
			$this->getActiveControl()->registerCallbackClientScript(
				$this->getClientClassName(), $this->getPostBackOptions());
	}

	/**
	 * Raises the callback event. This method is required by {@link
	 * ICallbackEventHandler} interface.
	 * This method is mainly used by framework and control developers.
	 * @param TCallbackEventParameter the event parameter
	 */
 	public function raiseCallbackEvent($param)
	{
		$this->onCallback($param);
	}

	/**
	 * This method is invoked when a callback is requested. The method raises
	 * 'OnCallback' event to fire up the event handlers. If you override this
	 * method, be sure to call the parent implementation so that the event
	 * handler can be invoked.
	 * @param TCallbackEventParameter event parameter to be passed to the event handlers
	 */
	public function onCallback($param)
	{
		$this->raiseEvent('OnCallback', $this, $param);
	}

	/**
	 * Updates the client-side options if the item list has changed after the OnLoad event.
	 */
	public function onPreRender($param)
	{
		parent::onPreRender($param);
		$this->getAdapter()->updateListItems();
	}
}