Atlas学习手记(23):使用行为增强用户界面(三):Hover Behavior


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  主要内容

  1.Hover Behavior简介

  2.完整示例

  一.Hover Behavior简介

  Hover Behavior提供了对DHTML的事件onmouseover,onmouseout,onfocus以及onblur的处理。简单示例代码:

<hoverBehavior
  dataContext="source for data binding operations"
  hoverElement="ID of element the hover behavior is attached to"
  id="identifier for looking up the component by name"
  propertyChanged="event handler"
  unhoverDelay="0|delay before unhover event in ms"
>
  <bindings>
    <!-- bindings -->
  </bindings>
  <hover>
    <!-- actions -->
  </hover>
  <propertyChanged>
    <!-- actions -->
  </propertyChanged>
  <unhover>
    <!-- actions -->
  </unhover>
</hoverBehavior>

  二.完整示例

  看一个完整的示例,新建Atlas Web Site后,在ASPX页面中放一个Div,当鼠标移动到它上面时背景颜色变为浅绿色:

<div>
<h3 style="text-decoration:underline">Hover Behavior Example</h3>
    <div id="panel2">This element is associated to the hoverBehavior.</div>
</div>

  然后编写Atlas脚本,这里也用到了setProperty这个Action,来为控件添加CSS样式,还有注意一下unhoverDelay属性,设置延迟时间:

<script type="text/xml-script">
  <page xmlns:script="http://schemas.microsoft.com/xml-script/2005">
    <components><control id="panel2" cssClass="start">
        <behaviors>
          <hoverBehavior unhoverDelay="500">
            <hover>
              <setProperty target="panel2" property="cssClass" value="hover"/>
            </hover>
            <unhover>
              <setProperty target="panel2" property="cssClass" value="start"/>
            </unhover>
          </hoverBehavior>
        </behaviors>
      </control>
    </components>
  </page>
</script>

  用到的CSS样式如下:

<style type="text/css">
  .start{}{background-color:lightyellow;
    border:dashed 2px black;}
  .hover{}{font-size:20pt;
    background-color:lightgreen;
    border:dashed 2px black;}
</style>

  编译运行后如下:

  移动鼠标到上面:

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