当填充/背景颜色发生变化时,WPF会闪烁
本文关键字:WPF 闪烁 变化 填充 背景 颜色 | 更新日期: 2023-09-27 18:27:31
每当数据绑定填充颜色发生变化时,我都希望有一个椭圆填充"闪烁"(立即变白,然后返回到新颜色)。这就是我目前所得到的:
<ctrls:NotifyEllipse Fill="{Binding Cluster.Brush, Converter={StaticResource CloneConverter}}" Width="10" Height="10" >
<ctrls:NotifyEllipse.Style>
<Style TargetType="{x:Type ctrls:NotifyEllipse}">
<Style.Triggers>
<EventTrigger RoutedEvent="ctrls:NotifyEllipse.FillChanged">
<BeginStoryboard>
<Storyboard AutoReverse="True">
<ColorAnimation Storyboard.TargetProperty="(ctrls:NotifyEllipse.Fill).Color" To="White" Duration="0:0:1" />
</Storyboard>
</BeginStoryboard>
</EventTrigger>
</Style.Triggers>
</Style>
</ctrls:NotifyEllipse.Style>
</ctrls:NotifyEllipse>
其中ctrls:NotifyEllipse
是仅包含椭圆的UserControl
,具有依赖属性Fill
和路由事件FillChanged
——类似于这个答案。颜色变化的检测部分工作得很好,但闪光部分(显然)并没有像我希望的那样工作:它首先将填充颜色更改为新颜色,然后慢慢变白,最后又变回新颜色。如上所述,目标是"闪光"——立即变白,然后恢复到新的颜色
请注意,Fill上有数据绑定,所以不可能有两个动画,一个是即时动画,另一个是慢速动画,因为我不知道返回哪种颜色:
<Storyboard>
<ColorAnimation Storyboard.TargetProperty="(ctrls:NotifyEllipse.Fill).Color" To="White" Duration="0:0:0" />
<ColorAnimation Storyboard.TargetProperty="(ctrls:NotifyEllipse.Fill).Color" To="???" Duration="0:0:1" />
</Storyboard>
加分:不是立即但快速地闪烁到白色,并保持原始颜色,直到达到全白色,然后慢慢地从白色变为新颜色,这将是理想的解决方案,但我担心这需要大量自定义动画代码。如上所述的闪光就足够了。
只需从White
:启动ColorAnimation
<Storyboard>
<ColorAnimation Storyboard.TargetProperty="Fill.Color"
From="White" Duration="0:0:1" />
</Storyboard>
为了完整起见,我的NotifyEllipse类如下所示:
public class NotifyEllipse : Shape
{
static NotifyEllipse()
{
FillProperty.AddOwner(typeof(NotifyEllipse), new FrameworkPropertyMetadata(
(o, e) =>
{
if (e.NewValue != e.OldValue)
{
((NotifyEllipse)o).RaiseEvent(new RoutedEventArgs(FillChangedEvent));
}
}));
}
public static readonly RoutedEvent FillChangedEvent =
EventManager.RegisterRoutedEvent(
"FillChanged", RoutingStrategy.Bubble,
typeof(RoutedEventHandler), typeof(NotifyEllipse));
public event RoutedEventHandler FillChanged
{
add { AddHandler(FillChangedEvent, value); }
remove { RemoveHandler(FillChangedEvent, value); }
}
protected override Geometry DefiningGeometry
{
get { return new EllipseGeometry(new Rect(RenderSize)); }
}
}