WPF 触发器

 1.属性触发器

主要用于依赖属性

< Style.Triggers >
                     < Trigger  Property ="IsMouseOver"  Value ="True" >
                         < Setter  Property  ="Background"  Value ="Green" />
                     </ Trigger >
</ Style.Triggers >

2.MultiTrigger

满足多个条件的时候才触发

 

< MultiTrigger >
     < MultiTrigger.Conditions >
       < Condition  Property ="HasItems"  Value ="false"   />
       < Condition  Property ="Width"  Value ="Auto"   />
     </ MultiTrigger.Conditions >
     < Setter  Property ="MinWidth"  Value ="120" />
   </ MultiTrigger >

3.DataTrigger

可用于非依赖属性，即可用于普通的用户自定义的.net属性，特点是多了个Binding

       < DataTrigger  Binding =" {Binding Path=State} "  Value ="WA" >
         < Setter  Property ="Foreground"  Value ="Red"   />
       </ DataTrigger >     
       < MultiDataTrigger >
         < MultiDataTrigger.Conditions >
           < Condition  Binding =" {Binding Path=Name} "  Value ="Portland"   />
           < Condition  Binding =" {Binding Path=State} "  Value ="OR"   />
         </ MultiDataTrigger.Conditions >
         < Setter  Property ="Background"  Value ="Cyan"   />
       </ MultiDataTrigger >

4.EventTrigger

由RoutedEvent触发后 以动画来响应

<EventTrigger RoutedEvent="Mouse.MouseLeave">
  <EventTrigger.Actions>
    <BeginStoryboard>
      <Storyboard>
        <DoubleAnimation
          Duration="0:0:1"
          Storyboard.TargetProperty="MaxHeight"  />
      </Storyboard>
    </BeginStoryboard>
  </EventTrigger.Actions>
</EventTrigger>