如何在后面的代码中添加带有 SoundActions 的 EventTrigger? [英] How to Add EventTrigger with SoundActions in code behind?

问题描述

因此，我正在尝试动态创建控件(准确地说是 RegularPolygon)，并且我想将 2 个 PlaySoundAction 作为基于 Tap 事件的 EventTrigger 添加到控件中.目前我有以下代码:

So I'm trying to create controls on the fly (RegularPolygon to be exact) and I want to add 2 PlaySoundActions to the controls as an EventTrigger based off of the Tap Event. Currently I have the following code:

EventTrigger trigger = new EventTrigger();
PlaySoundAction correct = new PlaySoundAction();
PlaySoundAction incorrect = new PlaySoundAction();
correct.Source = new Uri("/Sounds/Correct.mp3");
correct.Volume = 0.5;
incorrect.Source = new Uri("/Sounds/Incorrect.mp3");
incorrect.Volume = 0.5;

trigger.Actions.Add(correct);   // this line doesn't work
trigger.Actions.Add(incorrect); // this also doesn't work
shape.Triggers.Add(trigger);

每一行都有一个类似的错误

Each line has an error like

错误 2 参数 1:无法从'Microsoft.Expression.Interactivity.Media.PlaySoundAction' 到'System.Windows.TriggerAction'

Error 2 Argument 1: cannot convert from 'Microsoft.Expression.Interactivity.Media.PlaySoundAction' to 'System.Windows.TriggerAction'

我不完全确定将 PlaySoundAction 对象转换为什么.我不想在 XAML 中执行此操作，因为我正在即时创建这些控件.

I'm not entirely sure what to cast the PlaySoundAction object as. I don't want to do this in XAML because I'm creating these controls on the fly.

我还尝试为 RegularPolygon 创建一个样式，让 EventTrigger 和 PlaySoundAction(s)，但以编程方式设置控件的样式不会将此逻辑添加到控件中.

I also tried creating a Style for RegularPolygon to have the EventTrigger with the PlaySoundAction(s), but setting the style of the control programmatically does not add this logic to the control.

<Application.Resources>
        <ResourceDictionary>
            <Style TargetType="es:RegularPolygon" x:Key="Default">
                <i:Interaction.Triggers>
                    <i:EventTrigger EventName="Tap">
                        <eim:PlaySoundAction Source="/Sounds/Incorrect.mp3" Volume="0.5" />
                        <eim:PlaySoundAction Source="/Sounds/Correct.mp3" Volume="0.5" />
                    </i:EventTrigger>
                </i:Interaction.Triggers>
            </Style>
        </ResourceDictionary>
</Application.Resources>

有没有办法在后面的代码中添加 EventTrigger/PlaySoundAction 或创建一个控件可以继承的具有 EventTrigger/PlaySoundAction 的样式?

推荐答案

了解您正在尝试在代码中使用 System.Windows.EventTrigger 而不是 System.Windows.Interactivity.EventTrigger 可能会有所帮助.当我明确指定时 - 我让它工作了:

Perhaps it would help to know that you are trying to use System.Windows.EventTrigger instead of System.Windows.Interactivity.EventTrigger in your code. When I explicitly specified that - I got it to work:

System.Windows.Interactivity.EventTrigger trigger = 
    new System.Windows.Interactivity.EventTrigger();
trigger.EventName = "MouseLeftButtonDown";
PlaySoundAction correct = new PlaySoundAction();
correct.Source = new Uri("/Sample.wma", UriKind.Relative);
correct.Volume = 1.0;
trigger.Actions.Add(correct);
trigger.Attach(myTextBlock);

您需要确保您的控件也可以被点击 - IsHitTestVisible 不能设置为 false，并且需要设置填充画笔.不确定您的自定义控件的作用.

You need to make sure that your control can be tapped too - IsHitTestVisible can't be set to false and it needs to have a fill brush set. Not sure what your custom control does.

这是我的 XAML:

<Grid
    x:Name="ContentPanel"
    Background="LightCoral"
    Tap="ContentPanel_Tap"
    Grid.Row="1"
    Margin="12,0,12,0" >
    <StackPanel>
        <TextBlock
            Text="XAML Test">
            <i:Interaction.Triggers>
                <i:EventTrigger
                    EventName="MouseLeftButtonDown">
                    <eim:PlaySoundAction
                        Source="/Balloon.wav"
                        Volume="1" />
                </i:EventTrigger>
            </i:Interaction.Triggers>
        </TextBlock>
        <TextBlock
            Margin="0,100,0,0"
            x:Name="myTextBlock"
            Text="Coded Test" />
    </StackPanel>
</Grid>

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