我试图翻译this C# code。到目前为止我的尝试:
type MyButtonSimple() as self =
inherit Button()
static let TapEvent =
EventManager.RegisterRoutedEvent
( "Tap", RoutingStrategy.Bubble,
typeof<RoutedEventHandler>, typeof<MyButtonSimple>)
let tapEvent = new Event<RoutedEventHandler, RoutedEventArgs>()
let raiseTapEvent() =
let newEventArgs = new RoutedEventArgs(TapEvent)
tapEvent.Trigger(self, newEventArgs)
[<CLIEvent>]
member x.Tap = tapEvent.Publish
// For demonstration purposes we raise the event when clicked
override self.OnClick() =
raiseTapEvent()
MainWindow.xaml
<Window
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:funk="clr-namespace:funk;assembly=appWPF"
Title="Routed" Height="300" Width="400">
<StackPanel Background="LightGray">
<funk:MyButtonSimple Content="Spin" Background="#808080" Foreground="LightGray">
<funk:MyButtonSimple.RenderTransform>
<TransformGroup>
<RotateTransform x:Name="rotate"/>
</TransformGroup>
</funk:MyButtonSimple.RenderTransform>
<funk:MyButtonSimple.Triggers>
<EventTrigger RoutedEvent="funk:MyButtonSimple.Tap">
<BeginStoryboard>
<Storyboard RepeatBehavior="Forever">
<DoubleAnimation
Storyboard.TargetName="rotate"
Storyboard.TargetProperty="Angle"
From="0" To="90" Duration="0:0:2"/>
</Storyboard>
</BeginStoryboard>
</EventTrigger>
</funk:MyButtonSimple.Triggers>
</funk:MyButtonSimple>
</StackPanel>
</Window>
点击按钮不会启动动画。
将代码RoutedEvent="funk:MyButtonSimple.Tap"
更改为RoutedEvent="GotFocus"
会给出一个工作示例(重写Button.Click)。
任何想法我做错了什么?
答案 0 :(得分:3)
这很棘手,因为它做了很多F#中没有标准的事情。
C#代码的翻译将是:
type MyButtonSimple() as self =
inherit Button()
static let tapEvent =
EventManager.RegisterRoutedEvent
( "Tap", RoutingStrategy.Bubble,
typeof<RoutedEventHandler>, typeof<MyButtonSimple>)
// Create a custom event so you can override AddHandler/RemoveHandler behavior
let tapEvent =
{ new IDelegateEvent<RoutedEventHandler> with
member this.AddHandler del = self.AddHandler(MyButtonSimple.TapEvent, del)
member this.RemoveHandler del = self.RemoveHandler(MyButtonSimple.TapEvent, del) }
// Raise via routed eventing strategy
let raiseTapEvent() =
let newEventArgs = new RoutedEventArgs(MyButtonSimple.TapEvent)
self.RaiseEvent newEventArgs
// This isn't exactly the same, but public static fields aren't allowed in F#, and
// this works for WPF
static member TapEvent with get() = tapEvent
[<CLIEvent>]
member x.Tap = tapEvent
// For demonstration purposes we raise the event when clicked
override self.OnClick() =
raiseTapEvent()
主要&#34;陷阱&#34;这里需要覆盖标准事件行为,这需要自己实现IDelegateEvent
而不是使用正常的F#事件管理。此外,您无法在F#中执行公共静态只读字段,因此将事件包装到属性中。虽然WPF不是&#34;标准&#34;但WPF似乎没有问题。实现路由事件的方法。