下面这个问题已经困扰我好几天了,但我只能把它提炼成最简单的形式。考虑以下XAML:
<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>
它只需重新设置CheckBox
控件的模板,使其背景依赖于其状态:
选中的红色
因此,当您选中其中一个复选框时,您会期望它在短时间内变为浅绿色,然后变为绿色。类似地,当取消选中时,您会期望它在短时间内变为浅红色,然后变为红色。
它通常就是这么做的。,但并不总是。
使用该程序足够长的时间(我可以在大约30秒内得到它),你会发现在视觉状态下,过渡动画有时会胜过它。也就是说,复选框在选中时将继续显示为浅绿色,而在取消选中时将继续显示为浅红色。这是一个屏幕截图,说明了我的意思,是在配置转换所需的3秒之后拍摄的:
当发生这种情况时,并不是因为控件没有成功转换到目标状态。它声称处于正确的状态。我通过在调试器中检查以下内容来验证这一点(对于上面截图中记录的特定情况):
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;
如果我为动画启用跟踪,当转换成功完成时,我会得到以下输出:
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 :
当转换未能成功完成时,我会得到以下输出:
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 :
前12行与转换成功时完全相同,但最后10行完全丢失!
我已经通读了我能找到的所有VSM文档,但无法对这种反复无常的行为做出解释。
我可以假设这是VSM中的一个bug吗?对于此问题,是否有任何已知的解释或解决方法?
https://stackoverflow.com/questions/5002501
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