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很简单,我在 WPF4 中的 UserControl 上接收 TouchDown 事件时遇到了不可接受的延迟。我对事件堆栈的理解是 PreviewTouchDown 先发送,但仍然需要大约 300ms-500ms。代码如下。

<UserControl x:Class="MyButton"
         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" 
         mc:Ignorable="d" 
         d:DesignHeight="300" 
         d:DesignWidth="300" 
         Stylus.IsPressAndHoldEnabled="False"
         PreviewTouchDown="ProcessPreviewTouchDown"
         PreviewTouchUp="ProcessPreviewTouchUp">
</UserControl>

我还在我的窗口代码中添加了以下内容:

num = GlobalAddAtom(atom);
if (num == 0L)
{
   return false;
}
if (enable)
{
   return (RemoveProp(hWnd, atom).ToInt64() == 1L);
}
else
{
   int TABLET_DISABLE_PRESSANDHOLD        = 0x00000001;
   int TABLET_DISABLE_PENTAPFEEDBACK      = 0x00000008;
   int TABLET_DISABLE_PENBARRELFEEDBACK   = 0x00000010;
   int TABLET_DISABLE_TOUCHUIFORCEOFF     = 0x00000200;
   int TABLET_DISABLE_FLICKS              = 0x00010000;

   int dwHwndTabletProperty = 0x1010019 |
                    TABLET_DISABLE_PRESSANDHOLD |
                    TABLET_DISABLE_PENTAPFEEDBACK | 
                    TABLET_DISABLE_TOUCHUIFORCEOFF |
                    TABLET_DISABLE_PENBARRELFEEDBACK |
                    TABLET_DISABLE_FLICKS;

   return (SetProp(hWnd, atom, new IntPtr(dwHwndTabletProperty)) == 1);
}

这肯定会删除 UI,但不会导致明显的速度增加(即使 TABLET_DISABLE_PRESSANDHOLD 应该这样做,但我怀疑这与添加Stylus.IsPressAndHoldEnabled="False"到 XAML 相同)。

如果有人对如何使这种延迟消失有任何指示,我将不胜感激。

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