在我的 Silverlight 4 应用程序中,我创建了一个自定义控件并添加了 Visual States incl。过渡。第一次执行状态更改时,没有转换,只有从一个状态到另一个状态的快速变化(就像根本没有转换一样)。所有以下状态更改都按预期执行转换。我试图在构造函数中设置初始状态,但这没有帮助。有谁知道,为什么第一次没有过渡?
这是我的自定义控件中的一些代码:
[TemplateVisualState(GroupName="CommonState", Name="Expand")]
[TemplateVisualState(GroupName="CommonState", Name="Collapse")]
public class CollapsibleContainer : ContentControl
{
public CollapsibleContainer()
{
this.DefaultStyleKey = typeof(CollapsibleContainer);
VisualStateManager.GoToState(this, "Expand", false);
}
private void BorderHeader_Click(object sender, MouseButtonEventArgs args)
{
if (_contentPresenter.Visibility == Visibility.Collapsed)
{
_contentPresenter.Visibility = Visibility.Visible;
VisualStateManager.GoToState(this, "Expand", true);
}
else
{
_contentPresenter.Visibility = Visibility.Collapsed;
VisualStateManager.GoToState(this, "Collapse", true);
}
}
}
这是视觉状态的定义:
<VisualStateManager.VisualStateGroups>
<VisualStateGroup x:Name="CommonState">
<VisualState x:Name="Expand" />
<VisualState x:Name="Collapse">
<Storyboard>
<DoubleAnimation Duration="0" To="180" Storyboard.TargetProperty="(UIElement.RenderTransform).(CompositeTransform.Rotation)" Storyboard.TargetName="ImageArrowNormal" d:IsOptimized="True"/>
<DoubleAnimation Duration="0" To="180" Storyboard.TargetProperty="(UIElement.RenderTransform).(CompositeTransform.Rotation)" Storyboard.TargetName="ImageArrowHover" d:IsOptimized="True"/>
</Storyboard>
</VisualState>
<VisualStateGroup.Transitions>
<VisualTransition x:Name="Expand2Collapse" From="Expand" To="Collapse">
<Storyboard>
<DoubleAnimation Duration="0:0:0.3" To="180" Storyboard.TargetProperty="(UIElement.RenderTransform).(CompositeTransform.Rotation)" Storyboard.TargetName="ImageArrowNormal"/>
<DoubleAnimation Duration="0:0:0.3" To="180" Storyboard.TargetProperty="(UIElement.RenderTransform).(CompositeTransform.Rotation)" Storyboard.TargetName="ImageArrowHover"/>
</Storyboard>
</VisualTransition>
<VisualTransition x:Name="Collapse2Expand" From="Collapse" To="Expand">
<Storyboard>
<DoubleAnimation Duration="0:0:0.3" Storyboard.TargetProperty="(UIElement.RenderTransform).(CompositeTransform.Rotation)" Storyboard.TargetName="ImageArrowNormal"/>
<DoubleAnimation Duration="0:0:0.3" Storyboard.TargetProperty="(UIElement.RenderTransform).(CompositeTransform.Rotation)" Storyboard.TargetName="ImageArrowHover"/>
</Storyboard>
</VisualTransition>
</VisualStateGroup.Transitions>
</VisualStateGroup>
</VisualStateManager.VisualStateGroups>