feat: implement the X Input extension to support touch input, smooth scrolling, etc.

[ramezgerges]

GitHub Issue (If applicable): closes https://github.com/unoplatform/uno-private/issues/409, closes #17912, closes #16804

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What is the current behavior?

What is the new behavior?

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Internal Issue (If applicable):

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[jeromelaban]

@ramezgerges other than the rebase, is there anything missing in this PR? Once it is, I'll test it on actual hardware.

[ramezgerges]

@jeromelaban There's nothing that I plan to add, no. But considering I haven't tested touch at all, the PR will probably have some stuff "missing.

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[jeromelaban]

@ramezgerges could you resolve the conflicts? Thanks!

[lindexi]

My version of X input support: https://github.com/lindexi/uno/blob/f2f4d7980fcbf3cef4cbd4a56172e0cb1121aa74/src/Uno.UI.Runtime.Skia.X11/X11PointerInputSource.XInput.cs

I tested the code on a touch device and it passed.

But there are some points worth discussing:

1. Within XInput, the size of touch is no longer represented by width and height, but by the long and short axes of an ellipse.
2. Is there a need to perform DPI scaling calculations for width and height?
3. In XInput, if there is no change in the size of touch and pressure sensitivity, no values will be received. It may be necessary to use the data from the previous touch event at the lower level. Currently, my approach is to return a default value of 0 when no values are received.

[lindexi]

Update:

I reimplemente the X11PointerInputSource.XInput.cs to make it to support GetIntermediatePoints, which can alleviates the problem of input message stacking.

See https://github.com/lindexi/uno/blob/218e2016093af8523a1ad2b54cd169d20da09722/src/Uno.UI.Runtime.Skia.X11/X11PointerInputSource.XInput.cs#L277

Reference: #17527

[lindexi]

@jeromelaban Sorry to be pushing, can I know any update here?

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[HakanL]

@ramezgerges I've never used custom-built/debug Uno SDK before, but if you want me to try your changes please let me know and I'll figure it out.

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[ramezgerges]

Thanks @lindexi for your insights with this PR.

[HakanL]

Excited to see this merged in! Can you comment on which Nuget pre-release package versions I can find this in to do some tests?

[ramezgerges]

@HakanL It hasn't been automatically published yet, but it should be soon. The current latest sdk version on nuget.org is 5.6.0-dev.10, so most likely the first version after that.