利用Trigger完成WPF 的動畫-漸顯

其實漸顯很簡單，就是改變控件的透明度。

WPF提供了Trigger這個東西。

下面是動畫代碼：

 

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< Style x:Key = "BeginChildWindowStyle" TargetType = "{x:Type wtk:ChildWindow}" > < Style.Triggers > < Trigger Property = "wtk:ChildWindow.Visibility" Value = "Visible" > < Trigger.EnterActions > < BeginStoryboard > < Storyboard Storyboard.TargetProperty = "Opacity" > < DoubleAnimation From = "0" To = "1" Duration = "00:00:00.2" BeginTime = "00:00:00" /> </ Storyboard > </ BeginStoryboard > </ Trigger.EnterActions > </ Trigger > </ Style.Triggers > </ Style >

TargetType="{x:Type wtk:ChildWindow}"指定了目標控件的類型
<Trigger Property="wtk:ChildWindow.Visibility" Value="Visible">指定了目標控件的屬性值爲Visible時觸發