MVVM-在Silverlight视图模型中触发故事板
我认为如果可能的话，我想从 ViewModel 触发几个故事板。有没有一种简单的方法或优雅的方法来做到这一点。这就是我正在尝试做的事情。
人员单击按钮 --> RelayCommand（在 ViewModel 中），然后 Relay Command 应该播放情节提要。另外一件事，我还想在 ViewModel 中自行触发故事板动画，而无需任何交互。
<i:Interaction.Triggers>
<i:EventTrigger EventName="MouseLeftButtonDown">
<cmd:EventToCommand Command="{Binding ButtonPress}" CommandParameterValue="RedButtonLight">
</cmd:EventToCommand>
</i:EventTrigger>
</i:Interaction.Triggers>
I have a couple of Storyboards in my view that I would like to trigger from the ViewModel if possible. Is there a simple way or elegant way of doing this. Here is what I am trying to do.
Person Clicks on a Button-->RelayCommand (In the ViewModel), the Relay Command should then play the storyboard. Also one more thing, I would like to also trigger the storyboard animation by itself in the ViewModel without any interaction.
<i:Interaction.Triggers>
<i:EventTrigger EventName="MouseLeftButtonDown">
<cmd:EventToCommand Command="{Binding ButtonPress}" CommandParameterValue="RedButtonLight">
</cmd:EventToCommand>
</i:EventTrigger>
</i:Interaction.Triggers>
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我知道那是很久以前的事了。但我已经写了一篇关于触发故事板和 MVVM 的详细博客文章。
http://mark.mymonster.nl/ 2010/12/14/trigger-a-storyboard-on-viewmodel-changes/
I know it's a long time ago. But I've written a detailed blog post about Triggering Storyboards and MVVM.
http://mark.mymonster.nl/2010/12/14/trigger-a-storyboard-on-viewmodel-changes/
如果按钮单击纯粹是为了启动与视图相关的操作，并且没有执行任何实际的应用程序逻辑，那么我认为您可以在视图类的代码隐藏中完成所有这些操作。
如果不是这种情况，那么我将使用演示文稿 (ViewModel) 上的属性来表示演示文稿处于某种状态，并使视图对 PropertyChanged 事件做出反应并启动情节提要。这是假设您正在演示文稿类上实现 INotifyPropertyChanged。
If the button click is purely to power a view-related thing and isn't doing any actual application logic, then I would argue that you can do all this in the code-behind of the view class.
If this isn't the case then I would use a property on the Presentation (ViewModel) to signal that the Presentation is in a state, and have the view react to the PropertyChanged event and start the storyboard. This is assuming you are implimenting INotifyPropertyChanged on your Presentation class.
查看表达式示例。数据上下文中的事件有一个触发器。
DataEventTrigger每当您的视图模型引发特定事件时，您可以使用它来触发
ControlStoryboardAction来启动故事板。然后，您的视图模型可以将事件作为命令的一部分以及在其他时间引发。
Have a look at the expression samples. There is a trigger for events from the datacontext.
DataEventTriggerYou could use that to trigger a
ControlStoryboardActionto start the story board whenever your viewmodel raises a particular event.Your viewmodel could then raise the event as part of the command as well as at other times.
下面介绍了如何在 Blend 中执行此操作，而无需触及一行 xaml 或代码：
http://www.basarat.com/2011/05/expression -blend-starting-storyboard.html
Heres how you can do it in blend without touching a line of xaml or code :
http://www.basarat.com/2011/05/expression-blend-starting-storyboard.html