使用带有卡利微Message.Attach连接事件 [英] using attached events with caliburn micro Message.Attach
问题描述
我试图用卡利微信触发了我创建了一个附加事件：
I'm trying to use caliburn micro message to trigger an attached event that I created:
public static class DataChanging
{
public delegate void DataChangingEventHandler(object sender, DataChangingEventArgs e);
public static readonly RoutedEvent ChangingEvent =
EventManager.RegisterRoutedEvent("Changing",
RoutingStrategy.Bubble,
typeof(DataChangingEventHandler),
typeof(DataChanging));
public static void AddChangingHandler(DependencyObject o, DataChangingEventHandler handler)
{
((UIElement)o).AddHandler(DataChanging.ChangingEvent, handler);
}
public static void RemoveChangingHandler(DependencyObject o, DataChangingEventHandler handler)
{
((UIElement)o).RemoveHandler(DataChanging.ChangingEvent, handler);
}
public static bool GetActivationMode(DependencyObject obj)
{
return (bool)obj.GetValue(ActivationModeProperty);
}
public static void SetActivationMode(DependencyObject obj, bool value)
{
obj.SetValue(ActivationModeProperty, value);
}
public static readonly DependencyProperty ActivationModeProperty =
DependencyProperty.RegisterAttached("ActivationMode",
typeof(bool),
typeof(DataChanging),
new FrameworkPropertyMetadata(false,
HandleActivationModeChanged));
private static void HandleActivationModeChanged(DependencyObject target, DependencyPropertyChangedEventArgs e)
{
var dataGrid = target as XamDataGrid;
if (dataGrid == null) // if trying to attach to something else than a datagrid, just ignore
return;
if ((bool)e.NewValue)
{
dataGrid.RecordDeactivating += selector_RecordDeactivating;
}
else
{
dataGrid.RecordDeactivating -= selector_RecordDeactivating;
}
}
static void selector_RecordDeactivating(object sender, RecordDeactivatingEventArgs e)
{
var args = new DataChangingEventArgs(DataChanging.ChangingEvent,sender)
{
Data = ((DataRecord) e.Record).DataItem,
ShouldCancelChange = false
};
(sender as UIElement).RaiseEvent(args);
e.Cancel = args.ShouldCancelChange;
}
}
在XAML本身添加以下行：
In the XAML itself I added the following line:
cal:Message.Attach="[Helpers:DataChanging.Changing] = [Action SelectedDataChanged($eventArgs)]"
助手指向右命名空间。
我也尝试过其他版本的失败（完整的命名空间）：
Helpers refer to the right namespace. I also tried other versions that failed (full namespace):
cal:Message.Attach="[clr-namespace:RTF.Client.UI.Helpers.DataChanging.Changing] = [Action SelectedDataChanged($eventArgs)]"
尝试自己设定的互动事件：
tried to set the interaction event by myself:
当我尝试添加一个正常的事件触发一切都很好，所以这不是我的附加事件声明：
When I tried adding a normal event trigger everything worked well, so it's not my attached event declaration :
<EventTrigger RoutedEvent="Helpers:DataChanging.Changing">
<EventTrigger.Actions>
<BeginStoryboard x:Name="sb">
<Storyboard x:Name="dsf">
<Storyboard x:Name="myStoryboard">
<BooleanAnimationUsingKeyFrames Storyboard.TargetName="SSS" Storyboard.TargetProperty="IsChecked">
<DiscreteBooleanKeyFrame KeyTime="00:00:00" Value="False" />
</BooleanAnimationUsingKeyFrames>
</Storyboard>
</Storyboard>
</BeginStoryboard>
</EventTrigger.Actions>
</EventTrigger>
我在做什么错在这里？
有没有办法附加一个附加事件，并使用微卡利调用它？
What am I doing wrong here? There is no way to attach an attached event and invoke it using caliburn micro?
推荐答案
终于我明白了问题和解决方案。
问题在于system.windows.interactiviy.EventTrigger不支持所连的事件。
卡利微用它的行动因而我附加事件没有工作。
解决的办法是写一个定制的事件触发并以明确的方式使用微卡利行动。
定制的事件触发，从该职位采取：<一href=\"http://joyfulwpf.blogspot.com/2009/05/mvvm-invoking-command-on-attached-event.html?showComment=1323674885597#c8041424175408473805\">http://joyfulwpf.blogspot.com/2009/05/mvvm-invoking-command-on-attached-event.html?showComment=1323674885597#c8041424175408473805
finally I understand the problem and the solution. The problem is that system.windows.interactiviy.EventTrigger doesn't support attached events. Caliburn micro uses it for actions thus my attached event didn't work. The solution was to write a customized event trigger and use caliburn micro action in a explicit manner. the customized event trigger was taken from that post:http://joyfulwpf.blogspot.com/2009/05/mvvm-invoking-command-on-attached-event.html?showComment=1323674885597#c8041424175408473805
public class RoutedEventTrigger : EventTriggerBase<DependencyObject>
{
RoutedEvent _routedEvent;
public RoutedEvent RoutedEvent
{
get { return _routedEvent; }
set { _routedEvent = value; }
}
public RoutedEventTrigger() { }
protected override void OnAttached()
{
Behavior behavior = base.AssociatedObject as Behavior;
FrameworkElement associatedElement = base.AssociatedObject as FrameworkElement;
if (behavior != null)
{
associatedElement = ((IAttachedObject)behavior).AssociatedObject as FrameworkElement;
}
if (associatedElement == null)
{
throw new ArgumentException("Routed Event trigger can only be associated to framework elements");
}
if (RoutedEvent != null)
{ associatedElement.AddHandler(RoutedEvent, new RoutedEventHandler(this.OnRoutedEvent)); }
}
void OnRoutedEvent(object sender, RoutedEventArgs args)
{
base.OnEvent(args);
}
protected override string GetEventName() { return RoutedEvent.Name; }
}
，然后当你想使用卡利动作：
and then when you want to use caliburn action:
<i:Interaction.Triggers>
<!--in the routed event property you need to put the full name space and event name-->
<Helpers:RoutedEventTrigger RoutedEvent="Helpers:DataChanging.Changing">
<cal:ActionMessage MethodName="SelectedDataChanged">
<cal:Parameter Value="$eventargs" />
</cal:ActionMessage>
</Helpers:RoutedEventTrigger>
</i:Interaction.Triggers>
这篇关于使用带有卡利微Message.Attach连接事件的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
