我如何实现MVVM Light Toolkit EventTrigger [英] How do I implement MVVM Light Toolkit EventTrigger

问题描述

我正在尝试在WPF项目中实现一个Button，它通过单击并通过释放按钮将变量设置为1。因为我发现无法直接绑定到MouseDown和MouseUp。我试图使用MVVM Light Toolkit，但它无法正常工作。有谁知道处理这个？ VS2013 WPF4.5



来自MvvmLightLibs.4.2.30.0的我的DLL：

I am trying to implement a Button in a WPF project, which sets a variable to 1 by clicking and back by releasing the button. Since I found no way to bind to MouseDown and MouseUp directly. I am trying to go with MVVM Light Toolkit, but it is not working. Does anyone know to handle this? VS2013 WPF4.5

My DLLs from MvvmLightLibs.4.2.30.0:

GalaSoft.MvvmLight.Extras.WPF45
GalaSoft.MvvmLight.WPF45
System.Windows.Interactivity

我的XAML：

My XAML:

<UserControl x:Class="PMWA.View.OperatorView"

             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"

             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"

             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"

             xmlns:d="http://schemas.microsoft.com/expression/blend/2008"

             xmlns:i="clr-namespace:System.Windows.Interactivity;assembly=System.Windows.Interactivity"

             xmlns:cmd="clr-namespace:GalaSoft.MvvmLight.Command;assembly=GalaSoft.MvvmLight.Extras.WPF45">
    <Grid>
                <Button  x:Name="MoveUp"

                         Content="Up"

                         Margin="5">
                    <i:Interaction.Triggers>
                        <i:EventTrigger EventName="MouseDown">
                            <cmd:EventToCommand Command="{Binding MoveUpCommand}"/>
                        </i:EventTrigger>
                        <i:EventTrigger EventName="MouseUp">
                            <cmd:EventToCommand Command="{Binding StopMoveCommand}"/>
                        </i:EventTrigger>
                    </i:Interaction.Triggers>
                </Button>
                <Button x:Name="MoveDown"

                        Content="Down"

                    <i:Interaction.Triggers>
                        <i:EventTrigger EventName="MouseDown">
                            <cmd:EventToCommand Command="{Binding MoveDownCommand}" />
                        </i:EventTrigger>
                        <i:EventTrigger EventName="MouseUp">
                            <cmd:EventToCommand Command="{Binding StopMoveCommand}" />
                        </i:EventTrigger>
                    </i:Interaction.Triggers>
                </Button>
                <Button  x:Name="Apply"

                         Content="Apply"

                         Command="{Binding ApplyDistanceCommand}"

                <TextBox x:Name="Distance"

                         Text="{Binding CurrentDistance}"

    </Grid>
</UserControl>

Hier是我的ViewModel：

Hier is my ViewModel:

private ICommand moveUpCommand;
public ICommand MoveUpCommand
{
    get
    {
        if (moveUpCommand == null)
        {
            moveUpCommand = new RelayCommand(p => ExecuteMoveUpCommand());
        }
        return moveUpCommand;
    }
}
private void ExecuteMoveUpCommand()
{
    Trace.WriteLine("Move Up");
    SetPort1(1);
}

绑定在MainWindow.xaml.cs中设置如下：

And the binding is set up in MainWindow.xaml.cs like this:

private void SetupBindings()
{
    var operatorModel = new Model.Operator();
    operatorView.DataContext = new OperatorViewModel(operatorModel, measurementWeightListViewModel);
}

我有第三个按钮，工作正常，但那些上下按钮不会做任何事情:(



我搞砸了这个帖子，所以我在这里发布了：



MVVM Light Toolkit EventTrigger绑定不起作用 [ ^ ]

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