我正在尝试翻译这段 C# 代码 https://msdn.microsoft.com/en-us/library/ms752288.aspx。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()
主窗口.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>
单击该按钮不会启动动画。
更改代码RoutedEvent="funk:MyButtonSimple.Tap"
to RoutedEvent="GotFocus"
给出了一个工作示例(Button.Click 被覆盖)。
有什么想法我做错了吗?
这很棘手,因为它做了很多 F# 中不标准的事情。
该 C# 代码的翻译如下:
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()
这里的主要“陷阱”是您需要覆盖标准事件行为,这需要实现IDelegateEvent
您自己进行操作,而不是使用普通的 F# 事件管理。此外,您无法在 F# 中执行公共静态只读字段,因此这会将事件包装到属性中。 WPF 似乎对此很满意,尽管这不是实现路由事件的“标准”方式。
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