以编程方式调用WPF TargetedTriggerAction [英] Programmatically Call WPF TargetedTriggerAction
问题描述
我有一个来自第三方库的TargetedTriggerAction,它想在不将其附加到按钮的情况下进行调用/调用。我可以使用按钮来操作它,但是我想响应某些非UI事件。
I have a TargetedTriggerAction from a 3rd party library that would like to call/invoke without attaching it to a button. I have no problem getting it to work with the button, but I want to do it in response to some non-UI event.
这是操作的类声明:
public class MeasureAction : TargetedTriggerAction<Map>
到目前为止,这是我的设置代码:
Here is my setup code so far:
var measure = new MeasureAction();
measure.TargetObject = _mapControl;
measure.MeasureMode = MeasureAction.Mode.Polyline;
measure.MapUnits = DistanceUnit.Miles;
我希望能够执行类似的操作,但是我知道Invoke受保护:
I want to be able to do something like this, but I know Invoke is protected:
measure.Invoke();
推荐答案
要调用触发操作,您需要一个触发!
To invoke your trigger action, you need a trigger!
namespace TriggerTest
{
using System.Windows;
/// <summary>
/// A trigger that may be invoked from code.
/// </summary>
public class ManualTrigger : System.Windows.Interactivity.TriggerBase<DependencyObject>
{
/// <summary>
/// Invokes the trigger's actions.
/// </summary>
/// <param name="parameter">The parameter value.</param>
public void Invoke(object parameter)
{
this.InvokeActions(parameter);
}
}
}
以上是触发实现可以在没有任何UI依赖项的情况下调用。例如:
The above is a trigger implementation that may be invoked without any UI dependencies. For example:
var measure = new MeasureAction();
measure.TargetObject = _mapControl;
measure.MeasureMode = MeasureAction.Mode.Polyline;
measure.MapUnits = DistanceUnit.Miles;
ManualTrigger trigger = new ManualTrigger();
trigger.Actions.Add(measure);
trigger.Invoke(null);
要使调用更加简单,您可以添加扩展方法 TriggerAction
。
To make calling this even easier, you could add an extension method to TriggerAction
.
namespace TriggerTest
{
using System.Windows.Interactivity;
/// <summary>
/// Allows a trigger action to be invoked from code.
/// </summary>
public static class TriggerActionExtensions
{
/// <summary>
/// Invokes a <see cref="TriggerAction"/> with the specified parameter.
/// </summary>
/// <param name="action">The <see cref="TriggerAction"/>.</param>
/// <param name="parameter">The parameter value.</param>
public static void Invoke(this TriggerAction action, object parameter)
{
ManualTrigger trigger = new ManualTrigger();
trigger.Actions.Add(action);
try
{
trigger.Invoke(parameter);
}
finally
{
trigger.Actions.Remove(action);
}
}
/// <summary>
/// Invokes a <see cref="TriggerAction"/>.
/// </summary>
/// <param name="action">The <see cref="TriggerAction"/>.</param>
public static void Invoke(this TriggerAction action)
{
action.Invoke(null);
}
}
}
现在您可以写下您真正想要的东西:
var measure = new MeasureAction();
measure.TargetObject = _mapControl;
measure.MeasureMode = MeasureAction.Mode.Polyline;
measure.MapUnits = DistanceUnit.Miles;
measure.Invoke();
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