lindexi
commented
2 years ago The Initialize method in System.Windows.Interop.HwndSource will check the StylusLogic.IsPointerStackEnabled as the code:
if (StylusLogic.IsStylusAndTouchSupportEnabled)
{
// Choose between Wisp and Pointer stacks
if (StylusLogic.IsPointerStackEnabled)
{
// Enable the pointer support.
_stylus = new SecurityCriticalDataClass<IStylusInputProvider>(new HwndPointerInputProvider(this));
}
else
{
_stylus = new SecurityCriticalDataClass<IStylusInputProvider>(new HwndStylusInputProvider(this));
}
}Before enable the pointer support, it will enter the logic of HwndStylusInputProvider. And the HwndStylusInputProvider will return the flags when receive the WM_TABLET_QUERYSYSTEMGESTURESTATUS message in Hook.
private IntPtr Hook(IntPtr hwnd, int msg, IntPtr wparam, IntPtr lparam, ref bool handled)
{
const int WM_TABLET_DEFBASE =0x02C0;
const int WM_TABLET_QUERYSYSTEMGESTURESTATUS = WM_TABLET_DEFBASE + 12;
const int WM_TABLET_FLICK = WM_TABLET_DEFBASE + 11;
if (msg == WM_TABLET_QUERYSYSTEMGESTURESTATUS)
{
uint flags = 0;
flags |= TABLET_PRESSANDHOLD_DISABLED;
flags |= TABLET_TAPFEEDBACK_DISABLED;
flags |= TABLET_TOUCHUI_FORCEON;
flags |= TABLET_TOUCHUI_FORCEOFF;
flags |= TABLET_FLICKS_DISABLED;
handled = true;
return new IntPtr(flags);
}
else if (msg == WM_TABLET_FLICK)
{
handled = true;
return new IntPtr(1);
}
return IntPtr.Zero;
}
private const uint TABLET_PRESSANDHOLD_DISABLED = 0x00000001;
private const uint TABLET_TAPFEEDBACK_DISABLED = 0x00000008;
private const uint TABLET_TOUCHUI_FORCEON = 0x00000100;
private const uint TABLET_TOUCHUI_FORCEOFF = 0x00000200;
private const uint TABLET_FLICKS_DISABLED = 0x00010000;But it will do nothing, although we add the hook manually, when we enable the pointer support.
bastio84
Is this bug related specifically to tooling in Visual Studio (e.g. XAML Designer, Code editing, etc...)? No
Problem description:
Actual behavior: Tapping and holding on a control with Stylus.IsPressAndHoldEnabled disabled while the app has Switch.System.Windows.Input.Stylus.EnablePointerSupport enabled simply results in the same behaviour as if Stylus.IsPressAndHoldEnabled was enabled (pressing and holding results in a right click rather than a normal click, also if the control is something like a button, its state does not indicate that it is currently in the pressed state). Basically, Stylus.IsPressAndHoldEnabled has no effect when Switch.System.Windows.Input.Stylus.EnablePointerSupport is on.
Expected behavior: Stylus.IsPressAndHoldEnabled being set to false on a control should have the same effect as it does when Switch.System.Windows.Input.Stylus.EnablePointerSupport is disabled.
Minimal repro: Create a new WPF app, call AppContext.SetSwitch("Switch.System.Windows.Input.Stylus.EnablePointerSupport", "True") in the application startup event. Then, set Stylus.IsPressAndHoldEnabled to disabled on any control, such as a button (e.g. Stylus.SetIsPressAndHoldEnabled(Button1, False)). Stylus.IsPressAndHoldEnabled will have no effect on the control.