x11: Support xcb-keysyms as fallback when XKB support not available #679
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aperezdc
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clopez,
psaavedra,
TingPing and
carlosgcampos
psaavedra
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Nov 30, 2023
psaavedra
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Nov 30, 2023
Massage the parts from #303 which deal with input using xcb-keysyms to be included in the x11 platform plug-in. This provides a fallback that can be used when XKB initialization fails, typically in cases where the X server does not support XKB or has the support disabled. XKB is a X11 protocol extension after all, and it is wrong to assume that it will be always available. While at it, allow running without keyboard support, producing a warning in this case.
Allow disabling the XKB support in the x11 platform plug-in at build time. For this, introduce a new "x11_keyboard" Meson build option that can be set to use xkb, xcb-keysyms, both, or none. Preprocessor guards are introduced where needed to skip the XKB code.
Add a Wrap subproject definition for the xcb-keysyms dependency. It is a very simple library with a single C source file, so it is easy to make Meson build definitions for it that get added on top of the tarball release fetched by Meson if xcb-keysyms is not available. This way it is guaranteed that there will be at least some support for keyboard input if the XKB extension is not available in the X server, or not enabled at build time.
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I tested the build options here before submitting the PR 😄 |
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These patch set pulls the parts of the code from #303 which implement usage of
xcb-keysymsto handle keyboard input event translation, adding a few niceties on top:-Dx11_keyboard=to Meson to choose which methods are supported. It is possible to usexkb,xcb-keysyms, or both. Passing an empty list disables keyboard input to web views.xcb-keysyms, then XKB will be preferred, and if not available thenxcb-keysymsis used as fallback.xcb-keysymslibrary when not available. The library is a single.cfile so it does not add much weight to the X11 platform plug-in, and we make it less likely that people may end up without keyboard input support.Finally, I want to thank @agordon who was the person that originally wrote the code 🙏🏼