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>