Add invoke on-screen keyboard on desktop

[omatt]

Use case

There are use cases where Flutter apps are used in Kiosks running desktop platforms that needs a virtual keyboard for input. Currently, the on-screen keyboard needs to be enabled in desktops to appear. Another workaround on Windows platform is to switch the device into tablet mode to automatically display the softkeyboard when a TextField is active.

The current behavior is understandable since most desktop machines use a physical keyboard.

Proposal

Add a function similar to System.Diagnostics.Process.Start("osk.exe"); - where the on-screen keyboard can be invoked in Windows using C#. It'll be helpful if this can be also applied in macOS and Linux as well.

[maheshmnj]

HI @omatt, Thanks for filing the issue. That sounds like a valid proposal.

cc: @justinmc

[gspencergoog]

If you need to do this, you should be able to do it via the Dart FFI interface (if you want to make a call to a Windows API), or via Dart's Process API to launch osk.exe as you describe.

At this time, we're not planning on adding a separate API for this purpose. (Desktop Triage).

[github-actions]

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