如何停止动画WPF
本文关键字:WPF 动画 何停止 | 更新日期: 2023-09-27 18:23:42
如何停止动画,使其不会产生Completed
事件。以下是的简单示例
<Window x:Class="WpfApplication5.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="MainWindow" Height="248" Width="318">
<Grid>
<Border Width="20" Height="20" Background="Red" MouseEnter="Border_MouseEnter" MouseLeave="Border_MouseLeave" x:Name="border" />
</Grid>
</Window>
支持代码:
private void Border_MouseEnter(object sender, MouseEventArgs e)
{
var a = new DoubleAnimation { To = 0, Duration = TimeSpan.FromMilliseconds(4000) };
a.Completed += (obj, args) => MessageBox.Show("Boom!");
border.BeginAnimation(Border.OpacityProperty, a);
}
private void Border_MouseLeave(object sender, MouseEventArgs e)
{
border.BeginAnimation(Border.OpacityProperty, null);
border.Opacity = 1;
}
如果我在矩形变白之前将鼠标移出,一段时间后它仍然会显示弹出窗口。如何防止这种情况发生?假设Border_MouseLeave
和Border_MouseEnter
方法彼此不了解(它们不能将动画实例变量传递给彼此)。
您可以使用这个:
<Border Width="20" Height="20" Background="Red" x:Name="border" >
<Border.Triggers>
<EventTrigger RoutedEvent="MouseEnter">
<BeginStoryboard Name="Ali">
<Storyboard>
<DoubleAnimation To="0" Duration="0:0:4" Completed="com" Storyboard.TargetProperty="Opacity"/>
</Storyboard>
</BeginStoryboard>
</EventTrigger>
<EventTrigger RoutedEvent="MouseLeave">
<StopStoryboard BeginStoryboardName="Ali"/>
</EventTrigger>
</Border.Triggers>
</Border>
和:
private void com(object sender, EventArgs e)
{
MessageBox.Show("boom!");
}
您可以使用Property或Data Trigger的EnterActions和ExitActions属性,或者正如@Ali所说,正确使用Begin和Stop情节提要。