[英]WPF - Configure custom event to trigger begin storyboard on user control
I hope someone is able to assist here, either to advise how to fix what I have or to suggest a better way of achieving what I'm after.我希望有人能够在这里提供帮助,要么建议如何解决我所拥有的问题,要么提出一种更好的方法来实现我所追求的目标。
I have a simple custom control on which I want to be able to start/stop/pause/resume an opacity animation.我有一个简单的自定义控件,我希望能够在其上启动/停止/暂停/恢复不透明动画。 I've looked at various solutions and figured that using EventTrigger
with a custom RoutedEvent
was the way forward.我查看了各种解决方案,并认为将EventTrigger
与自定义RoutedEvent
是前进的方向。 I can get the following to work with a standard event (eg MouseDown
) but am unable to get my custom event to start the storyboard.我可以获得以下内容来处理标准事件(例如MouseDown
),但无法让我的自定义事件启动故事板。
I tried raising the event in the constructor prior to doing it in a loaded event, but neither makes any difference.在加载事件中执行之前,我尝试在构造函数中引发事件,但两者都没有任何区别。
I don't think it has any relevant impact but this is also being hosted in an ElementHost
for winforms.我认为它没有任何相关影响,但这也托管在ElementHost
以用于 winforms。
xaml: xml:
<UserControl x:Class="Fraxinus.BedManagement.WpfControls.FraxIconX"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:local="clr-namespace:Fraxinus.BedManagement.WpfControls"
mc:Ignorable="d"
d:DesignHeight="16" d:DesignWidth="16"
Loaded="FraxIconX_Loaded">
<!--Height="16" Width="16" Background="{Binding Path=Background, RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type Control}, AncestorLevel=1}}" -->
<UserControl.Resources>
<ResourceDictionary>
<Border x:Key="RoundedBorderMask" Name="iconBorder" CornerRadius="4" Background="White" BorderThickness="2" Height="16" Width="16" HorizontalAlignment="Center" VerticalAlignment="Center"/>
<ResourceDictionary.MergedDictionaries>
<ResourceDictionary Source="Dictionary.xaml"/>
</ResourceDictionary.MergedDictionaries>
</ResourceDictionary>
</UserControl.Resources>
<Border BorderThickness="2" CornerRadius="4" Height="16" Width="16" HorizontalAlignment="Center" VerticalAlignment="Center">
<local:FraxCanvas x:Name="fraxCanvas" Height="16" Width="16" HorizontalAlignment="Center" VerticalAlignment="Center">
<local:FraxCanvas.Background>
<LinearGradientBrush StartPoint="0,0" EndPoint="0,1" GradientStops="{Binding GradientStops}" />
</local:FraxCanvas.Background>
<local:FraxCanvas.Triggers>
<EventTrigger RoutedEvent="local:FraxCanvas.OnStartStoryboard" SourceName="fraxCanvas">
<BeginStoryboard x:Name="storyboard">
<Storyboard>
<DoubleAnimation Storyboard.TargetProperty="Opacity" From="1" To="0.25" AutoReverse="True" Duration="0:0:1" RepeatBehavior="Forever"></DoubleAnimation>
</Storyboard>
</BeginStoryboard>
</EventTrigger>
</local:FraxCanvas.Triggers>
<local:FraxCanvas.OpacityMask>
<!--https://wpf.2000things.com/2012/05/11/556-clipping-to-a-border-using-an-opacity-mask/-->
<VisualBrush Visual="{StaticResource RoundedBorderMask}"></VisualBrush>
</local:FraxCanvas.OpacityMask>
<Image HorizontalAlignment="Center" VerticalAlignment="Center" Height="16" Width="16" Source="{DynamicResource BitmapClockPng}" />
</local:FraxCanvas>
</Border>
</UserControl>
Code behind背后的代码
public partial class FraxIconX : UserControl
{
public GradientStopCollection GradientStops { get; set; }
public FraxIconX() { }
public FraxIconX(Color backColour, int width = 16, int height = 16)
{
Width = width;
Height = height;
GradientStops = new GradientStopCollection { new GradientStop(Colors.AliceBlue, 0.0), new GradientStop(Colors.Navy, 1.0) };
Background = new SolidColorBrush(backColour);
DataContext = this;
InitializeComponent();
}
public void FraxIconX_Loaded(object sender, RoutedEventArgs args)
{
RaiseEvent(new RoutedEventArgs(FraxCanvas.StartStoryboardEvent));
}
}
FraxCanvas:弗拉克斯帆布:
public class FraxCanvas : Canvas
{
public static readonly RoutedEvent StartStoryboardEvent = EventManager.RegisterRoutedEvent("OnStartStoryboard", RoutingStrategy.Tunnel, typeof(RoutedEventHandler), typeof(FraxCanvas));
public event RoutedEventHandler OnStartStoryboard
{
add
{
this.AddHandler(StartStoryboardEvent, value);
}
remove
{
this.RemoveHandler(StartStoryboardEvent, value);
}
}
}
Two issues.两个问题。
EventTrigger.SourceName="fraxCanvas"
, but the event is raised somewhere else (parent UserControl
).您正在专门收听EventTrigger.SourceName="fraxCanvas"
,但该事件在其他地方(父UserControl
)引发。EventTrigger.SourceName
is a filter property, which allows to exclusively handle a Routed Event of a specific element. EventTrigger.SourceName
是一个过滤器属性,它允许专门处理特定元素的路由事件。 If you don't set EventTrigger.SourceName
, the trigger will handle the specified event, no matter the source.如果不设置EventTrigger.SourceName
,触发器将处理指定的事件,无论来源如何。FraxCanvas
element, because a parent raised it.路由事件永远不会到达FraxCanvas
元素,因为它是由父级引发的。RoutingStrategy.Bubble
: event travels from event source , the FraxIconX
element, to the visual tree root eg, Window
. RoutingStrategy.Bubble
:事件从事件源( FraxIconX
元素)传播到可视化树根,例如Window
。RoutingStrategy.Tunnel
: event travels from the tree root eg, Window
and stops at the event source , the FraxIconX
element. RoutingStrategy.Tunnel
:事件从树根(例如Window
并在事件源( FraxIconX
元素)处停止。 The solution is to remove the EventTrigger.SourceName
attribute and move the trigger to the event source (the UserControl
) or to any of the event source's parent element:解决方案是删除EventTrigger.SourceName
属性并将触发器移动到事件源( UserControl
)或任何事件源的父元素:
<UserControl>
<UserControl.Triggers>
<EventTrigger RoutedEvent="local:FraxCanvas.OnStartStoryboard">
<BeginStoryboard x:Name="storyboard">
<Storyboard>
<DoubleAnimation Storyboard.TargetName="fraxCanvas"
Storyboard.TargetProperty="Opacity"
From="1" To="0.25" />
</Storyboard>
</BeginStoryboard>
</EventTrigger>
</UserControl.Triggers>
<Border>
<FraxCanvas x:Name="fraxCanvas" />
</Border>
</UserControl>
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