动画几乎不会停止,图像会重置其位置,但我希望动画完成到下一个完整的360°。
有关于此的任何想法吗?
XAML代码:
<Button
BorderThickness="0"
Cursor="Hand"
Command="{Binding RefreshCommand}">
<Button.Template>
<ControlTemplate TargetType="Button">
<Border>
<ContentPresenter />
</Border>
</ControlTemplate>
</Button.Template>
<Image Source="../Resources/RefreshIcon.png">
<Image.Style>
<Style>
<Setter Property="Image.RenderTransform">
<Setter.Value>
<RotateTransform />
</Setter.Value>
</Setter>
<Setter Property="Image.RenderTransformOrigin" Value=".5,.5">
</Setter>
<Style.Triggers>
<DataTrigger Binding="{Binding IsRefreshing}" Value="True">
<DataTrigger.EnterActions>
<BeginStoryboard Name="RotationStoryboard">
<Storyboard>
<DoubleAnimation
Storyboard.TargetProperty="RenderTransform.Angle"
From="0"
To="360"
Duration="0:0:0.8"
RepeatBehavior="Forever" />
</Storyboard>
</BeginStoryboard>
</DataTrigger.EnterActions>
</DataTrigger>
<DataTrigger Binding="{Binding IsRefreshing}" Value="False">
<DataTrigger.EnterActions>
<RemoveStoryboard BeginStoryboardName="RotationStoryboard"/>
</DataTrigger.EnterActions>
</DataTrigger>
</Style.Triggers>
</Style>
</Image.Style>
</Image>
</Button>
最终解决方案除了必须将其放入UserControl以使其更通用之外(另请参阅下面的@Sheridans帖子和我的评论):
<Button
BorderThickness="0"
Cursor="Hand"
Command="{Binding RefreshCommand}">
<Button.Template>
<ControlTemplate TargetType="Button">
<Border>
<ContentPresenter />
</Border>
</ControlTemplate>
</Button.Template>
<Image
Name="RefreshImage"
Source="../Resources/RefreshIcon.png"
RenderTransformOrigin=".5,.5">
<Image.Resources>
<Storyboard
x:Key="RotationStoryboard"
Completed="RotationStoryboardCompleted">
<DoubleAnimation
Storyboard.Target="{Binding ElementName=RefreshImage}"
Storyboard.TargetProperty="RenderTransform.Angle"
From="0"
To="360"
Duration="0:0:1.5">
<DoubleAnimation.EasingFunction>
<CircleEase EasingMode="EaseInOut"></CircleEase>
</DoubleAnimation.EasingFunction>
</DoubleAnimation>
</Storyboard>
</Image.Resources>
<Image.Style>
<Style>
<Setter Property="Image.RenderTransform">
<Setter.Value>
<RotateTransform />
</Setter.Value>
</Setter>
<Setter Property="Image.RenderTransformOrigin" Value=".5,.5">
</Setter>
<Style.Triggers>
<DataTrigger Binding="{Binding IsRefreshing}" Value="True">
<DataTrigger.EnterActions>
<BeginStoryboard>
<StaticResource ResourceKey="RotationStoryboard"/>
</BeginStoryboard>
</DataTrigger.EnterActions>
</DataTrigger>
</Style.Triggers>
</Style>
</Image.Style>
</Image>
</Button>
代码背后:
public partial class SomeView
{
public SomeView()
{
InitializeComponent();
}
private void RotationStoryboardCompleted(object sender, EventArgs e)
{
var viewModel = (ISomeViewModel)DataContext;
var storyboard = (Storyboard)((ClockGroup)sender).Timeline;
if (viewModel.IsRefreshing)
{
storyboard.Begin();
}
}
}
答案 0 :(得分:1)
我不知道在XAML中有什么办法可以做到这一点,但是对于代码,你可以使用Timeline.Completed
Event。如果您将一个处理程序附加到Storyboard
,那么它将在完成时被调用,您可以随心所欲地执行任何操作:
<BeginStoryboard>
<Storyboard Name="RotationStoryboard" Completed="StoryboardCompleted">
<DoubleAnimation Storyboard.TargetProperty="RenderTransform.Angle" From="0"
To="360" Duration="0:0:0.8" />
</Storyboard>
</BeginStoryboard>
在代码中:
private void StoryboardCompleted(object sender, EventArgs e)
{
// Restart your Storyboard here each time until you want it to stop.
}
有关进一步的帮助,请参阅MSDN上链接页面中的示例。