如何在不产生重复行为的情况下组合触摸和鼠标事件处理程序? [英] How can I combine Touch and Mouse Event Handlers without producing duplicate behavior?

问题描述

我正在开发WPF应用程序，该应用程序正在触摸屏平板电脑上使用.我使用VS2015 IDE进行开发，并使用鼠标进行调试.

I am working on a WPF application which is being used on a Touch Screen Tablet. I develop using VS2015 IDE and I use my Mouse to debug.

我必须处理按钮的 down 和 up 事件，才能执行某些任务.我使用 PreviewMouse 和 PreviewTouch 事件处理程序，在每种情况下我都遇到问题:

I must handle buttons' down and up events to execute certain tasks. I use PreviewMouse and PreviewTouch event handlers and I have a problem in every case I use:

• 案例1:使用 PreviewMouseDown ， PreviewMouseUp ， PreviewTouchDown 和 PreviewTouchUp .对于每个按钮，我需要复制代码以包括单独的Touch和Mouse Event处理程序，但功能完全相同.我这样做是为了能够使用应用程序(鼠标)，并让用户使用它(触摸).问题:触摸事件处理程序执行鼠标事件处理程序；导致应用程序复制行为.例如:一个将 x 递增1的按钮，如果您单击"它，则将增加1，而如果您触摸"它，则将增加2.

• Case 1: Using PreviewMouseDown,PreviewMouseUp,PreviewTouchDown and PreviewTouchUp. For each button, I need to duplicate my code to include separate Touch and Mouse Event handlers but the exact same functionality. I do this for me to be able to use the Application (Mouse) and for the the user to use it (Touch). Problem: Touch Event Handlers executes Mouse Event Handlers; Causing the application to duplicate the behavior. Ex: A button that increments x by one, will increment by one if you "Click" it but increment by two if you "Touch" it.

案例2:使用点击， PreviewMouseUp 和 PreviewTouchUp .问题:鼠标单击上没有调用 PreviewTouchUp 和 PreviewMouseUp .

Case 2: Using Click, PreviewMouseUp and PreviewTouchUp. Problem: The PreviewTouchUp and PreviewMouseUp do not get called on Mouse Click.

案例3:为每个按钮创建一个方法，并通过诸如

Case 3: Create a method for each button and call it from both Touch and Mouse events like How to get Touchscreen to use Mouse Events. Problem: Duplicate behavior (method gets called twice)

案例4::删除所有Touch事件，因为在任何Touch上执行 PreviewMouseDown 和 PreviewMouseUp .该行为有效，但是我需要触摸按钮上的某些位置才能执行.(透明度?我必须精确地触摸一个位置-就像鼠标一样吗?)

Case 4: Remove all Touch events since PreviewMouseDown and PreviewMouseUp are being executed on any Touch. The behavior works but I need to Touch certain positions on the button in order for it to execute. (Transparency? I must touch exactly one position - like a mouse?)

案例5:，而不是使用 Preview 使用 MouseUp 和 MouseDown .根本没有在Touch上工作，没有触摸按钮上的任何位置.

Case 5: Using MouseUp and MouseDown instead of Preview. Didn't work on Touch at all, touching any position on the button.

我想要与此类似的内容

I want something similar to this Prevent a WPF application to interpret touch events as mouse events but only on the tablet. I still need to use my mouse in my environment. How can I fix that?

按钮示例XAML:

<Button x:Name="locationScrollUpButton" Margin="0,5,5,0" Background="Transparent" Padding="0" Grid.Row="1" Grid.Column="1" PreviewMouseUp="locationScrollUpButton_PreviewMouseUp" PreviewMouseDown="locationScrollUpButton_PreviewMouseDown" BorderThickness="0" PreviewTouchDown="locationScrollUpButton_PreviewTouchDown" PreviewTouchUp="locationScrollUpButton_PreviewTouchUp" >
    <StackPanel>
        <TextBlock x:Name="locationUpButtonText" Text="Up" FontSize="13" Margin="0,2,0,4" HorizontalAlignment="Center" VerticalAlignment="Center"/>
        <Image x:Name="locationUpButtonImage" Source="/ProjectName;component/Resources/CaptureView/Location-Scroll-Up-White.png" Width="55" Height="60"/>
    </StackPanel>
</Button>

推荐答案

所以我最终使用了很酷的技巧.基于艾哈迈德对另一个问题的回答

So I ended up doing it using a cool hack. Based on Ahmad's answer on this other question HERE we know the fire order of the handlers:

在触摸设备上:

TouchDown> PreviewMouseDown> TouchUp> PreviewMouseUp

TouchDown > PreviewMouseDown > TouchUp > PreviewMouseUp

非接触式:

PreviewMouseDown> PreviewMouseUp

PreviewMouseDown > PreviewMouseUp

并基于此处的@ M.Kazem评论.现在，此修复程序如下所示:

And based on @M.Kazem comments here. The fix now looks something like this:

private bool ButtonPreview = true;
private void Button_TouchDown(object sender, TouchEventArgs e)
{
    // task 1
    ButtonPreview = false;
}
private void Button_TouchUp(object sender, TouchEventArgs e)
{
    // task 2
    // ..
}
private void Button_PreviewMouseDown(object sender, MouseButtonEventArgs e)
{
    if (ButtonXPreview)
    {
        // task 1
    }
    else
        ButtonXPreview = true;

}
private void Button_PreviewMouseUp(object sender, MouseButtonEventArgs e)
{
    if (ButtonXPreview)
    {
        // task 2
    }
    else
        ButtonXPreview = true;
}

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