Question

我想在MouseLeftButtonUp处理MouseDoubleClick和Image个事件。我将galasoft mvvm light库用于EventToCommand。但是，MouseDoubleClick未被调用。实际上，它被称为，但非常罕见。为什么会发生这种情况以及如何解决？

<ContentControl>
    <Image Source = "{Binding Img}" Stretch="Fill" />

    <i:Interaction.Triggers>
        <i:EventTrigger EventName = "MouseLeftButtonUp" >
            < cmd:EventToCommand Command = "{Binding MouseUpCommand}" PassEventArgsToCommand="True" />
        </i:EventTrigger>
        <i:EventTrigger EventName = "MouseDoubleClick" >
            < cmd:EventToCommand Command = "{Binding DoubleClickCommand}" PassEventArgsToCommand="True" />
        </i:EventTrigger>
    </i:Interaction.Triggers>
</ContentControl>



private ICommand _doubleClickCommand;
public ICommand DoubleClickCommand
{
    get
    {
        if (_doubleClickCommand== null)
        {
            _doubleClickCommand=new RelayCommand<MouseEventArgs>(DoubleClikcFunc);
        }

        return _doubleClickCommand;
    }
}

private ICommand _mouseUpCommand;
public ICommand MouseUpCommand
{
    get
    {
        if (_mouseUpCommand== null)
        {
            _mouseUpCommand= new RelayCommand<MouseEventArgs>(MouseUpFunc);
        }

        return _mouseUpCommand;
    }
}

private void MouseUpFunc(MouseEventArgs e)
{
    Points.Add(e.GetPosition((IInputElement)e.Source));
}

private void DoubleClikcFunc(MouseEventArgs e)
{
    Points.Add(MaskPoints[0]);
}

Answer 1

双击的第二次点击是按照定义始终，只需单击一次，这样您就可以更好地单独处理MouseLeftButtonDown事件并检查ClickCount属性EventArgs确定是否有双击：

<i:Interaction.Triggers>
    <i:EventTrigger EventName="MouseLeftButtonDown" >
        <cmd:EventToCommand Command = "{Binding MouseUpCommand}" PassEventArgsToCommand="True" />
    </i:EventTrigger>
</i:Interaction.Triggers>

private ICommand _mouseUpCommand;
public ICommand MouseUpCommand
{
    get
    {
        if (_mouseUpCommand == null)
        {
            _mouseUpCommand = new RelayCommand<MouseButtonEventArgs>(MouseUpFunc);
        }

        return _mouseUpCommand;
    }
}

private void MouseUpFunc(MouseButtonEventArgs e)
{
    if (e.ClickCount == 2)
        Debug.Write("double");
    else
        Debug.Write("single");
}

如果您不想处理前面的单击，您可以使用计时器等待200毫秒，看看是否有其他点击，然后才能按照我的建议实际处理事件：

How do we separate click and double click on listview in WPF application?

Answer 2

您必须在图像标记之间放置触发器。现在，您将click事件绑定到UserControl。

以下是普通WPF InputBindings的示例：

        <Image Source = "{Binding Img}" Stretch="Fill">
            <Image.InputBindings>
                <MouseBinding MouseAction="LeftDoubleClick" Command="{Binding DoubleClickCommand}" />
                <MouseBinding MouseAction="LeftClick" Command="{Binding MouseUpCommand}" />
            </Image.InputBindings>
        </Image>

如何处理'MouseLeftButtonUp`和`MouseDoubleClick`鼠标事件？

2 个答案: