如何在MVVM中播放声音和动画 [英] How to play Sound and Animations in MVVM

问题描述

我已经阅读了很多有关播放声音/动画的最佳方法的博客，但如果可能的话，我希望看到一个简化的示例，以了解如何做到这一点，以便我更好地理解.

I have read alot of blogs about the best way to play sound/Animation but if possible I would like to see a simplified example on how this is done so I understand better.

所以我对MVVM的理解

So to my understanding in MVVM

视图->声音和动画

ViewModel->如果某些值为true，我想在视图上播放声音和动画.

The ViewModel-->If some value is true, i would like to play the Sound and Animation on the view.

现在我该怎么做.有人告诉我使用ISoundService和IAnimationService之类的接口.在View中实施，然后做什么?如果可能的话，一个可行的裸露示例将大有帮助.

Now How would I go about doing this. I was told to use interfaces like ISoundService and IAnimationService. Implement in the View and then do what? If possible, a workable bare bone example will help alot.

推荐答案

就声音而言，不一定是处理它的View.例如，我这样做是为了播放声音:

As far as sound goes, this isn't necessarily the View that handles it. For instance, I do something like this for playing a sound:

public interface IAudioPlayer
{
    void Play(string fileName);
}

public class AudioPlayer : IAudioPlayer
{
    private readonly SoundPlayer player = new SoundPlayer();

    public void Play(string fileName)
    {
        player.Stream = File.OpenRead(fileName);
        player.Play();
    }
}

然后，我使用依赖注入将其传递到我的ViewModel中:

Then, I use Dependency Injection to pass it into my ViewModel:

public class TheViewModel
{
    public TheViewModel(IAudioPlayer audioPlayer)
    {
         // probably store it as a private readonly field for later use.
    }
}

另一种选择是让声音服务摆在那儿，监听ViewModel通过某些消息传递系统(例如EventAggregator)发送的事件.

Another option would be to have a sound service sitting out there, listening to events that the ViewModel sends through some messaging system... EventAggregator, for instance.

就动画而言，相同类型的方法可以起作用.通常，我在XAML的视图"中定义动画.然后，在View中，我侦听ViewModel触发的某种事件，以告知View执行该动画.

As far as Animation, the same types of approaches can work. Usually, I define the animation in the View in XAML. Then, in the View, I listen for some sort of event to be fired from the ViewModel to tell the View to execute that animation.

此外，在过去，我将数据绑定用于ViewModel中控制的双精度值，因此仍然存在一些可测试的行为来管理动画.

Also, in the past, I have used data binding to double values that are controlled in the ViewModel so there is still some testable behavior that manages the animation.

我使用的另一种方法是混合MVVM/MVP，其中ViewModel传递了一个IView接口，上面带有一个名为ExecuteDeletionAnimation的方法. ViewModel调用该方法，然后View实现该方法.

One other approach that I have used is a hybrid MVVM/MVP thing, where the ViewModel gets passed an IView interface with a method on it called ExecuteDeletionAnimation. The ViewModel calls the method, and the View implements the method.

希望这会有所帮助吗?

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