我有一个动画,通过无限旋转 360 度(基本上是旋转)来为 Canvas
提供动画效果。我想要的是该动画在显示控件时开始,然后在隐藏控件时停止。我想我可以以某种方式将其与 VisualStateManager 结合起来。我见过一个淡入淡出控件的例子here这可以工作,但我只是不知道如何使用 VSM 来启动和停止 Storyboard
<Canvas.Resources>
<Storyboard x:Name="spinnerBoard">
<DoubleAnimation
Storyboard.TargetName="SpinnerRotate"
Storyboard.TargetProperty="Angle"
From="0" To="360" Duration="0:0:01.3"
RepeatBehavior="Forever" />
</Storyboard>
</Canvas.Resources>
<Canvas.RenderTransform>
<RotateTransform x:Name="SpinnerRotate" Angle="0" />
</Canvas.RenderTransform>
VSM 示例
<VisualState x:Name="Show">
<Storyboard>
<!-- Start the story board here -->
</Storyboard>
</VisualState>
<VisualState x:Name="Hide">
<Storyboard>
<!-- Stop the story board here -->
</Storyboard>
</VisualState>
最佳答案
对您不同问题的全面解答:
ExtendedVisualStateManager.GoToElementState returns false in Silverlight
Default binding to UserControl for custom DP
你可以这样做:
- 使用扩展
ContentControl
的模板控件来进行操作 内容的IsEnabled
(防止等待期间执行操作); - 创建一个 DP
IsWaiting
来切换控件的视觉状态; - 在 XAML 中创建两种状态:使用
DoubleAnimation
和RepeatBehavior="Forever"
在您可以添加覆盖层和等待消息依赖属性(例如繁忙指示器控件)之后...
我使用图片作为等待视觉部分,但您可以使用 Canvas 、网格等...
C#
[TemplateVisualState(GroupName = "WaitGroup", Name = WaitSpinner.IsWaitingStateName)]
[TemplateVisualState(GroupName = "WaitGroup", Name = WaitSpinner.NotWaitingStateName)]
public class WaitSpinner : ContentControl
{
#region States names
internal const String IsWaitingStateName = "IsWaitingState";
internal const String NotWaitingStateName = "NotWaitingState";
#endregion States names
public bool IsWaiting
{
get { return (bool)GetValue(IsWaitingProperty); }
set { SetValue(IsWaitingProperty, value); }
}
public static readonly DependencyProperty IsWaitingProperty =
DependencyProperty.Register("IsWaiting", typeof(bool), typeof(WaitSpinner), new PropertyMetadata(false, OnIsWaitingPropertyChanged));
private static void OnIsWaitingPropertyChanged(DependencyObject sender, DependencyPropertyChangedEventArgs e)
{
WaitSpinner waitSpinner = (WaitSpinner)sender;
waitSpinner.ChangeVisualState(true);
}
public WaitSpinner()
{
DefaultStyleKey = typeof(WaitSpinner);
}
public override void OnApplyTemplate()
{
base.OnApplyTemplate();
ChangeVisualState(false);
}
protected virtual void ChangeVisualState(bool useTransitions)
{
VisualStateManager.GoToState(this, IsWaiting ? IsWaitingStateName : NotWaitingStateName, useTransitions);
}
}
Xaml:
<VisualStateGroup x:Name="WaitGroup">
<VisualState x:Name="NotWaitingState" >
<Storyboard>
<ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="(Control.IsEnabled)" Storyboard.TargetName="content">
<DiscreteObjectKeyFrame KeyTime="0">
<DiscreteObjectKeyFrame.Value>
<System:Boolean>True</System:Boolean>
</DiscreteObjectKeyFrame.Value>
</DiscreteObjectKeyFrame>
</ObjectAnimationUsingKeyFrames>
</Storyboard>
</VisualState>
<VisualState x:Name="IsWaitingState">
<Storyboard>
<ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="(UIElement.Visibility)" Storyboard.TargetName="WaitPart">
<DiscreteObjectKeyFrame KeyTime="0:0:0.200" Value="Visible"/>
</ObjectAnimationUsingKeyFrames>
<DoubleAnimation Storyboard.TargetProperty="(UIElement.RenderTransform).(RotateTransform.Angle)" Storyboard.TargetName="WaitPart" To="360" RepeatBehavior="Forever" Duration="0:0:1" />
<ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="(Control.IsEnabled)" Storyboard.TargetName="content">
<DiscreteObjectKeyFrame KeyTime="0">
<DiscreteObjectKeyFrame.Value>
<System:Boolean>False</System:Boolean>
</DiscreteObjectKeyFrame.Value>
</DiscreteObjectKeyFrame>
</ObjectAnimationUsingKeyFrames>
</Storyboard>
</VisualState>
</VisualStateGroup>
<!-- ............. -->
<ContentControl
IsTabStop="False"
x:Name="content"
Content="{TemplateBinding Content}"
ContentTemplate="{TemplateBinding ContentTemplate}"
HorizontalContentAlignment="{TemplateBinding HorizontalContentAlignment}"
VerticalContentAlignment="{TemplateBinding VerticalContentAlignment}"
Foreground="{TemplateBinding Foreground}"
ScrollViewer.HorizontalScrollBarVisibility="{TemplateBinding ScrollViewer.HorizontalScrollBarVisibility}"
ScrollViewer.VerticalScrollBarVisibility="{TemplateBinding ScrollViewer.VerticalScrollBarVisibility}"/>
<Image Source="CirclePicture.png"
x:Name="WaitPart"
RenderTransformOrigin="0.5,0.5"
Width="16"
Height="16"
Visibility="Collapsed"
IsHitTestVisible="False">
<Image.RenderTransform>
<RotateTransform />
</Image.RenderTransform>
</Image>
关于c# - 使用 VisualStateManager 启动和停止 Storyboard,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/17741799/