如何将两个附加行为附加到一个 XAML 元素？

发布于 2024-07-21 07:51:49 字数 1641 浏览 6 评论 0原文

我已经实现了此处找到的附加命令行为模式并且它工作得很好，例如允许边框在 ViewModel 中触发左键或右键单击事件：

XAML：

<Border Background="Yellow" Width="350" Margin="0,0,10,0" Height="35" CornerRadius="2"
        c:CommandBehavior.Event="MouseLeftButtonDown" 
        c:CommandBehavior.Command="{Binding PressedLeftButton}"
        c:CommandBehavior.CommandParameter="MainBorder123">
    <TextBlock Text="this is the click area"/>
</Border>

代码隐藏：< /strong>

public ICommand PressedLeftButton { get; private set; }

public MainViewModel()
{

    Output = "original value";

    PressedLeftButton = new SimpleCommand
    {
        ExecuteDelegate = parameterValue => {
            Output = String.Format("left mouse button was pressed at {0} and sent the parameter value \"{1}\"", DateTime.Now.ToString(), parameterValue.ToString());
        }
    };
}

但是，如何将两个附加行为附加到一个元素，例如我想做类似以下的事情，但它当然会给我一个错误：

<Border Background="Yellow" Width="350" Margin="0,0,10,0" Height="35" CornerRadius="2"
        c:CommandBehavior.Event="MouseLeftButtonDown" 
        c:CommandBehavior.Command="{Binding PressedLeftButton}"
        c:CommandBehavior.CommandParameter="MainBorder123"
        c:CommandBehavior.Event="MouseRightButtonDown" 
        c:CommandBehavior.Command="{Binding PressedRighttButton}"
        c:CommandBehavior.CommandParameter="MainBorder123"
        >

原文

I've implemented the attached command behavior pattern found here and it works well to allow e.g. a Border to have a left- or right-click event that fires in the ViewModel:

XAML:

<Border Background="Yellow" Width="350" Margin="0,0,10,0" Height="35" CornerRadius="2"
        c:CommandBehavior.Event="MouseLeftButtonDown" 
        c:CommandBehavior.Command="{Binding PressedLeftButton}"
        c:CommandBehavior.CommandParameter="MainBorder123">
    <TextBlock Text="this is the click area"/>
</Border>

Code Behind:

public ICommand PressedLeftButton { get; private set; }

public MainViewModel()
{

    Output = "original value";

    PressedLeftButton = new SimpleCommand
    {
        ExecuteDelegate = parameterValue => {
            Output = String.Format("left mouse button was pressed at {0} and sent the parameter value \"{1}\"", DateTime.Now.ToString(), parameterValue.ToString());
        }
    };
}

However, how do I attach two attached behaviors to one element, e.g. I want to do something like the following but it of course gives me an error:

<Border Background="Yellow" Width="350" Margin="0,0,10,0" Height="35" CornerRadius="2"
        c:CommandBehavior.Event="MouseLeftButtonDown" 
        c:CommandBehavior.Command="{Binding PressedLeftButton}"
        c:CommandBehavior.CommandParameter="MainBorder123"
        c:CommandBehavior.Event="MouseRightButtonDown" 
        c:CommandBehavior.Command="{Binding PressedRighttButton}"
        c:CommandBehavior.CommandParameter="MainBorder123"
        >

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高跟鞋的旋律 2024-07-28 07:51:49

您发送的链接包含该答案。您可以使用 ACB v2 中的 CommandBehaviorCollection.Behaviors 功能。

   <Border Background="Yellow" Width="350" Margin="0,0,10,0" Height="35" CornerRadius="2" x:Name="test">
       <local:CommandBehaviorCollection.Behaviors>
               <local:BehaviorBinding Event="MouseLeftButtonDown" Action="{Binding DoSomething}" CommandParameter="An Action on MouseLeftButtonDown"/>
               <local:BehaviorBinding Event="MouseRightButtonDown" Command="{Binding SomeCommand}" CommandParameter="A Command on MouseRightButtonDown"/>
       </local:CommandBehaviorCollection.Behaviors>
       <TextBlock Text="MouseDown on this border to execute the command"/>
   </Border>

The link you sent contains that very answer. You can use the CommandBehaviorCollection.Behaviors capabilities in ACB v2.

   <Border Background="Yellow" Width="350" Margin="0,0,10,0" Height="35" CornerRadius="2" x:Name="test">
       <local:CommandBehaviorCollection.Behaviors>
               <local:BehaviorBinding Event="MouseLeftButtonDown" Action="{Binding DoSomething}" CommandParameter="An Action on MouseLeftButtonDown"/>
               <local:BehaviorBinding Event="MouseRightButtonDown" Command="{Binding SomeCommand}" CommandParameter="A Command on MouseRightButtonDown"/>
       </local:CommandBehaviorCollection.Behaviors>
       <TextBlock Text="MouseDown on this border to execute the command"/>
   </Border>

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