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	<title>Li Guoliang &#187; ListEvent</title>
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	<description>ActionScript Flex Java JEE PHP...</description>
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		<title>Flex: DataGrid使用ListEvent.ITEM_DOUBLE_CLICK监听双击事件</title>
		<link>http://liguoliang.com/2010/flex-datagrid%e4%bd%bf%e7%94%a8listevent-item_double_click%e7%9b%91%e5%90%ac%e5%8f%8c%e5%87%bb%e4%ba%8b%e4%bb%b6/</link>
		<comments>http://liguoliang.com/2010/flex-datagrid%e4%bd%bf%e7%94%a8listevent-item_double_click%e7%9b%91%e5%90%ac%e5%8f%8c%e5%87%bb%e4%ba%8b%e4%bb%b6/#comments</comments>
		<pubDate>Sun, 31 Jan 2010 08:48:19 +0000</pubDate>
		<dc:creator>Guoliang</dc:creator>
				<category><![CDATA[ActionScript]]></category>
		<category><![CDATA[Flex]]></category>
		<category><![CDATA[DataGrid]]></category>
		<category><![CDATA[DoubleClicked]]></category>
		<category><![CDATA[ListEvent]]></category>
		<category><![CDATA[MouseEvent]]></category>

		<guid isPermaLink="false">http://liguoliang.com/2010/01/1133/</guid>
		<description><![CDATA[之前没怎么注意, 一直用MouseEvent.DOUBLE_CLICK来监听DataGrid的双击事件. 但这样会造成即使在空行双击也会激发响应.
		datagridClasses.doubleClickEnabled = true;
		datagridClasses.addEventListe<p class='read-more'><a href='http://liguoliang.com/2010/flex-datagrid%e4%bd%bf%e7%94%a8listevent-item_double_click%e7%9b%91%e5%90%ac%e5%8f%8c%e5%87%bb%e4%ba%8b%e4%bb%b6/'>More...</a></p><p><p>

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]]></description>
			<content:encoded><![CDATA[<p>之前没怎么注意, 一直用MouseEvent.DOUBLE_CLICK来监听DataGrid的双击事件. 但这样会造成即使在空行双击也会激发响应.</p>
<pre class="java" name="code">		datagridClasses.doubleClickEnabled = true;
		datagridClasses.addEventListener(MouseEvent.DOUBLE_CLICK, onDGDoubleClicked);</pre>
<p>正确方法应该使用ListEvent.ITEM_DOUBLE_CLICK监听项目双击事件.</p>
<pre class="java" name="code">		datagridClasses.addEventListener(ListEvent.ITEM_DOUBLE_CLICK, onDGDoubleClicked);</pre>
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		<item>
		<title>[小技巧] 通过监听DataGrid的ListEvent.Change控制button是否可用.</title>
		<link>http://liguoliang.com/2008/%e5%b0%8f%e6%8a%80%e5%b7%a7-%e9%80%9a%e8%bf%87%e7%9b%91%e5%90%acdatagrid%e7%9a%84listeventchange%e6%8e%a7%e5%88%b6button%e6%98%af%e5%90%a6%e5%8f%af%e7%94%a8/</link>
		<comments>http://liguoliang.com/2008/%e5%b0%8f%e6%8a%80%e5%b7%a7-%e9%80%9a%e8%bf%87%e7%9b%91%e5%90%acdatagrid%e7%9a%84listeventchange%e6%8e%a7%e5%88%b6button%e6%98%af%e5%90%a6%e5%8f%af%e7%94%a8/#comments</comments>
		<pubDate>Sun, 28 Dec 2008 13:01:24 +0000</pubDate>
		<dc:creator>Guoliang</dc:creator>
				<category><![CDATA[ActionScript]]></category>
		<category><![CDATA[Flex]]></category>
		<category><![CDATA[DataGrid]]></category>
		<category><![CDATA[ListEvent]]></category>

		<guid isPermaLink="false">http://liguoliang.com/2008/12/643/</guid>
		<description><![CDATA[如下, 在没有点击[默认]是, 后两个button的enable=false;
<a href="http://liguoliang.com/wp-content/uploads/2008/12/image2.png"><img title="image" style="border-top-width: 0px; display: inline; border-left-width: 0px; border-bottom-width: 0px; border-right-width: 0px" height="180" alt="image" src="http://liguoliang.com/wp-content/uploads/2008/12/image-thumb2.png" width="244" border="0" /></a> 
点击一个之后:
<a href="http://liguoliang.com/wp-content/uploads/2008/12/image3.png"><img title="image" style="border-top-width: 0px; display: inline; border-left-width: 0px; border-bottom-width: 0px; border-right-width: 0px" height="175" alt="image" src="http://liguoliang.com/wp-content/uploads/2008/12/image-thumb3.png" width="244" border="0" /></a> 
简单实现方法:
_dataGridStudent.addEventListener(ListEvent.CHANGE, onSlectedChange);
对应监听函数:

		_actionEd<p class='read-more'><a href='http://liguoliang.com/2008/%e5%b0%8f%e6%8a%80%e5%b7%a7-%e9%80%9a%e8%bf%87%e7%9b%91%e5%90%acdatagrid%e7%9a%84listeventchange%e6%8e%a7%e5%88%b6button%e6%98%af%e5%90%a6%e5%8f%af%e7%94%a8/'>More...</a></p><p><p>

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]]></description>
			<content:encoded><![CDATA[<p>如下, 在没有点击[默认]是, 后两个button的enable=false;</p>
<p><a href="http://liguoliang.com/wp-content/uploads/2008/12/image2.png"><img title="image" style="border-top-width: 0px; display: inline; border-left-width: 0px; border-bottom-width: 0px; border-right-width: 0px" height="180" alt="image" src="http://liguoliang.com/wp-content/uploads/2008/12/image-thumb2.png" width="244" border="0" /></a> </p>
<p>点击一个之后:</p>
<p><a href="http://liguoliang.com/wp-content/uploads/2008/12/image3.png"><img title="image" style="border-top-width: 0px; display: inline; border-left-width: 0px; border-bottom-width: 0px; border-right-width: 0px" height="175" alt="image" src="http://liguoliang.com/wp-content/uploads/2008/12/image-thumb3.png" width="244" border="0" /></a> </p>
<p>简单实现方法:</p>
<pre class="java" name="code">_dataGridStudent.addEventListener(ListEvent.CHANGE, onSlectedChange);</pre>
<p>对应监听函数:</p>
<pre class="java" name="code">
		_actionEdit.enabled = _dataGridStudent.selectedItem != null;
		_actionDelete.enabled = _dataGridStudent.selectedItem != null;
</pre>
<p>这样实现了:<br />
1.无点击时不可用<br />
2.点击且有选择时可用<br />
3. 如点击之后, 按住Ctrl点击, 可取消对其选择, 这时将置按钮于不可用状态.</p>
<p><p>

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