以下問題一直困擾着我好幾天了,但我只是能夠將其簡化爲最簡單的形式。請看下面的XAML:VisualStateManager未按照所宣傳的那樣工作
<Window x:Class="VSMTest.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="MainWindow" Height="350" Width="525">
<Window.Resources>
<Style TargetType="CheckBox">
<Setter Property="Margin" Value="3"/>
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="CheckBox">
<Grid x:Name="Root">
<Grid.Background>
<SolidColorBrush x:Name="brush" Color="White"/>
</Grid.Background>
<VisualStateManager.VisualStateGroups>
<VisualStateGroup Name="CheckStates">
<VisualStateGroup.Transitions>
<VisualTransition To="Checked" GeneratedDuration="00:00:03">
<Storyboard Name="CheckingStoryboard">
<ColorAnimationUsingKeyFrames Storyboard.TargetName="brush" Storyboard.TargetProperty="Color">
<DiscreteColorKeyFrame KeyTime="0" Value="LightGreen"/>
</ColorAnimationUsingKeyFrames>
</Storyboard>
</VisualTransition>
<VisualTransition To="Unchecked" GeneratedDuration="00:00:03">
<Storyboard Name="UncheckingStoryboard">
<ColorAnimationUsingKeyFrames Storyboard.TargetName="brush" Storyboard.TargetProperty="Color">
<DiscreteColorKeyFrame KeyTime="0" Value="LightSalmon"/>
</ColorAnimationUsingKeyFrames>
</Storyboard>
</VisualTransition>
</VisualStateGroup.Transitions>
<VisualState Name="Checked">
<Storyboard Name="CheckedStoryboard" Duration="0">
<ColorAnimationUsingKeyFrames Storyboard.TargetName="brush" Storyboard.TargetProperty="Color">
<DiscreteColorKeyFrame KeyTime="0" Value="Green"/>
</ColorAnimationUsingKeyFrames>
</Storyboard>
</VisualState>
<VisualState Name="Unchecked">
<Storyboard Name="UncheckedStoryboard" Duration="0">
<ColorAnimationUsingKeyFrames Storyboard.TargetName="brush" Storyboard.TargetProperty="Color">
<DiscreteColorKeyFrame KeyTime="0" Value="Red"/>
</ColorAnimationUsingKeyFrames>
</Storyboard>
</VisualState>
</VisualStateGroup>
</VisualStateManager.VisualStateGroups>
<ContentPresenter/>
</Grid>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
</Window.Resources>
<StackPanel>
<CheckBox x:Name="cb1">Check Box 1</CheckBox>
<CheckBox x:Name="cb2">Check Box 2</CheckBox>
<CheckBox x:Name="cb3">Check Box 3</CheckBox>
</StackPanel>
</Window>
它只是重新模板的CheckBox
控制,使得其背景是取決於它的狀態:
- 選中=綠色
- 未選中=紅
- 檢查(過渡)=淺綠色
- 取消選中(過渡)=淡紅色
因此,當您選中其中一個複選框時,您會希望它在短時間內變爲淺綠色,然後變爲綠色。同樣,如果取消選中,您會希望它在短時間內變爲淡紅色,然後變爲紅色。
它通常就是這樣。 但並非總是如此。
用足夠長的時間播放節目(我可以在大約30秒內播放它),並且您會發現過渡動畫有時會在視覺狀態下勝過它。也就是說,複選框在選中時將繼續顯示爲淺綠色,未選中時則顯示爲淺紅色。下面是說明我的意思的截圖,取3秒過渡配置後取好:
如果發生這種情況,這是不因爲控制未成功轉換到目標狀態。它聲稱處於正確的狀態。我驗證了這個在調試器檢查以下內容(通過上面的截圖中介紹的特定情況下):
var vsgs = VisualStateManager.GetVisualStateGroups(VisualTreeHelper.GetChild(this.cb2, 0) as FrameworkElement);
var vsg = vsgs[0];
// this is correctly reported as "Unselected"
var currentState = vsg.CurrentState.Name;
如果我啓用跟蹤動畫,我得到以下輸出時的轉換成功完成:
System.Windows.Media.Animation Start: 1 : Storyboard has begun; Storyboard='System.Windows.Media.Animation.Storyboard'; Storyboard.HashCode='44177654'; Storyboard.Type='System.Windows.Media.Animation.Storyboard'; StoryboardName='UncheckedStoryboard'; TargetElement='System.Windows.Controls.Grid'; TargetElement.HashCode='41837403'; TargetElement.Type='System.Windows.Controls.Grid'; NameScope='<null>'
System.Windows.Media.Animation Stop: 1 :
System.Windows.Media.Animation Start: 1 : Storyboard has begun; Storyboard='System.Windows.Media.Animation.Storyboard'; Storyboard.HashCode='6148812'; Storyboard.Type='System.Windows.Media.Animation.Storyboard'; StoryboardName='UncheckedStoryboard'; TargetElement='System.Windows.Controls.Grid'; TargetElement.HashCode='8261103'; TargetElement.Type='System.Windows.Controls.Grid'; NameScope='<null>'
System.Windows.Media.Animation Stop: 1 :
System.Windows.Media.Animation Start: 1 : Storyboard has begun; Storyboard='System.Windows.Media.Animation.Storyboard'; Storyboard.HashCode='36205315'; Storyboard.Type='System.Windows.Media.Animation.Storyboard'; StoryboardName='UncheckedStoryboard'; TargetElement='System.Windows.Controls.Grid'; TargetElement.HashCode='18626439'; TargetElement.Type='System.Windows.Controls.Grid'; NameScope='<null>'
System.Windows.Media.Animation Stop: 1 :
System.Windows.Media.Animation Start: 3 : Storyboard has been removed; Storyboard='System.Windows.Media.Animation.Storyboard'; Storyboard.HashCode='44177654'; Storyboard.Type='System.Windows.Media.Animation.Storyboard'; StoryboardName='UncheckedStoryboard'; TargetElement='System.Windows.Controls.Grid'; TargetElement.HashCode='41837403'; TargetElement.Type='System.Windows.Controls.Grid'
System.Windows.Media.Animation Stop: 3 :
System.Windows.Media.Animation Start: 1 : Storyboard has begun; Storyboard='System.Windows.Media.Animation.Storyboard'; Storyboard.HashCode='36893403'; Storyboard.Type='System.Windows.Media.Animation.Storyboard'; StoryboardName='CheckingStoryboard'; TargetElement='System.Windows.Controls.Grid'; TargetElement.HashCode='41837403'; TargetElement.Type='System.Windows.Controls.Grid'; NameScope='<null>'
System.Windows.Media.Animation Stop: 1 :
System.Windows.Media.Animation Start: 1 : Storyboard has begun; Storyboard='System.Windows.Media.Animation.Storyboard'; Storyboard.HashCode='49590434'; Storyboard.Type='System.Windows.Media.Animation.Storyboard'; StoryboardName='<null>'; TargetElement='System.Windows.Controls.Grid'; TargetElement.HashCode='41837403'; TargetElement.Type='System.Windows.Controls.Grid'; NameScope='<null>'
System.Windows.Media.Animation Stop: 1 :
System.Windows.Media.Animation Start: 3 : Storyboard has been removed; Storyboard='System.Windows.Media.Animation.Storyboard'; Storyboard.HashCode='36893403'; Storyboard.Type='System.Windows.Media.Animation.Storyboard'; StoryboardName='CheckingStoryboard'; TargetElement='System.Windows.Controls.Grid'; TargetElement.HashCode='41837403'; TargetElement.Type='System.Windows.Controls.Grid'
System.Windows.Media.Animation Stop: 3 :
System.Windows.Media.Animation Start: 3 : Storyboard has been removed; Storyboard='System.Windows.Media.Animation.Storyboard'; Storyboard.HashCode='49590434'; Storyboard.Type='System.Windows.Media.Animation.Storyboard'; StoryboardName='<null>'; TargetElement='System.Windows.Controls.Grid'; TargetElement.HashCode='41837403'; TargetElement.Type='System.Windows.Controls.Grid'
System.Windows.Media.Animation Stop: 3 :
System.Windows.Media.Animation Start: 1 : Storyboard has begun; Storyboard='System.Windows.Media.Animation.Storyboard'; Storyboard.HashCode='16977025'; Storyboard.Type='System.Windows.Media.Animation.Storyboard'; StoryboardName='CheckedStoryboard'; TargetElement='System.Windows.Controls.Grid'; TargetElement.HashCode='41837403'; TargetElement.Type='System.Windows.Controls.Grid'; NameScope='<null>'
System.Windows.Media.Animation Stop: 1 :
System.Windows.Media.Animation Start: 3 : Storyboard has been removed; Storyboard='System.Windows.Media.Animation.Storyboard'; Storyboard.HashCode='16977025'; Storyboard.Type='System.Windows.Media.Animation.Storyboard'; StoryboardName='CheckedStoryboard'; TargetElement='System.Windows.Controls.Grid'; TargetElement.HashCode='41837403'; TargetElement.Type='System.Windows.Controls.Grid'
System.Windows.Media.Animation Stop: 3 :
System.Windows.Media.Animation Start: 1 : Storyboard has begun; Storyboard='System.Windows.Media.Animation.Storyboard'; Storyboard.HashCode='16977025'; Storyboard.Type='System.Windows.Media.Animation.Storyboard'; StoryboardName='CheckedStoryboard'; TargetElement='System.Windows.Controls.Grid'; TargetElement.HashCode='41837403'; TargetElement.Type='System.Windows.Controls.Grid'; NameScope='<null>'
System.Windows.Media.Animation Stop: 1 :
而且我得到以下輸出時的轉換未能成功完成:
System.Windows.Media.Animation Start: 1 : Storyboard has begun; Storyboard='System.Windows.Media.Animation.Storyboard'; Storyboard.HashCode='44177654'; Storyboard.Type='System.Windows.Media.Animation.Storyboard'; StoryboardName='UncheckedStoryboard'; TargetElement='System.Windows.Controls.Grid'; TargetElement.HashCode='41837403'; TargetElement.Type='System.Windows.Controls.Grid'; NameScope='<null>'
System.Windows.Media.Animation Stop: 1 :
System.Windows.Media.Animation Start: 1 : Storyboard has begun; Storyboard='System.Windows.Media.Animation.Storyboard'; Storyboard.HashCode='6148812'; Storyboard.Type='System.Windows.Media.Animation.Storyboard'; StoryboardName='UncheckedStoryboard'; TargetElement='System.Windows.Controls.Grid'; TargetElement.HashCode='8261103'; TargetElement.Type='System.Windows.Controls.Grid'; NameScope='<null>'
System.Windows.Media.Animation Stop: 1 :
System.Windows.Media.Animation Start: 1 : Storyboard has begun; Storyboard='System.Windows.Media.Animation.Storyboard'; Storyboard.HashCode='36205315'; Storyboard.Type='System.Windows.Media.Animation.Storyboard'; StoryboardName='UncheckedStoryboard'; TargetElement='System.Windows.Controls.Grid'; TargetElement.HashCode='18626439'; TargetElement.Type='System.Windows.Controls.Grid'; NameScope='<null>'
System.Windows.Media.Animation Stop: 1 :
System.Windows.Media.Animation Start: 3 : Storyboard has been removed; Storyboard='System.Windows.Media.Animation.Storyboard'; Storyboard.HashCode='44177654'; Storyboard.Type='System.Windows.Media.Animation.Storyboard'; StoryboardName='UncheckedStoryboard'; TargetElement='System.Windows.Controls.Grid'; TargetElement.HashCode='41837403'; TargetElement.Type='System.Windows.Controls.Grid'
System.Windows.Media.Animation Stop: 3 :
System.Windows.Media.Animation Start: 1 : Storyboard has begun; Storyboard='System.Windows.Media.Animation.Storyboard'; Storyboard.HashCode='36893403'; Storyboard.Type='System.Windows.Media.Animation.Storyboard'; StoryboardName='CheckingStoryboard'; TargetElement='System.Windows.Controls.Grid'; TargetElement.HashCode='41837403'; TargetElement.Type='System.Windows.Controls.Grid'; NameScope='<null>'
System.Windows.Media.Animation Stop: 1 :
System.Windows.Media.Animation Start: 1 : Storyboard has begun; Storyboard='System.Windows.Media.Animation.Storyboard'; Storyboard.HashCode='49590434'; Storyboard.Type='System.Windows.Media.Animation.Storyboard'; StoryboardName='<null>'; TargetElement='System.Windows.Controls.Grid'; TargetElement.HashCode='41837403'; TargetElement.Type='System.Windows.Controls.Grid'; NameScope='<null>'
System.Windows.Media.Animation Stop: 1 :
第12行是完全一樣的,當轉換成功,但最後10行完全丟失!
我已經通讀了所有我能找到的VSM文檔,並且一直無法解釋這種不規則的行爲。
我是否認爲這是VSM中的一個錯誤?有沒有對這個問題有任何已知的解釋或解決方法?
解決方法之一是退出vsm並使用樣式觸發器/ multitrigger。 – blindmeis 2011-02-15 13:54:52
你已經標記了WPF和Silverlight。兩者都有相同的行爲嗎? – 2011-02-15 14:23:18
@Steve:它的WPF,但看起來他也在尋找任何Silverlight傢伙的幫助,因爲VSM也是Silverlight的一部分。 – decyclone 2011-02-15 14:54:21