65 lines
1.7 KiB
Text
65 lines
1.7 KiB
Text
Visual Components Library is responsible for the widgets (windowing, buttons, controls, file-pickers etc.) operating system abstraction, including basic rendering (e.g. the output device).
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VCL provides a graphical toolkit similar to gtk+, Qt, SWING etc.
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source/
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+ the main cross-platform chunk of source
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inc/
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+ cross-platform abstraction headers
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vcl/
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+ public headers ("public" to the rest of LibreOffice, that is)
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generic/
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+ shared helper code for *some* of the backends, actually built into vcl.
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headless/
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+ a backend renderer that draws to bitmaps
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android/
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+ Android backend (work in progress, does work to some extent)
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aqua/
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+ OS X backend
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ios/
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+ iOS backend (work in progres, does not work, needs re-think
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and re-write)
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win/
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+ Windows backend
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unx/
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+ X11 backend and its sub-platforms
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plugadapt/
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+ pluggable framework to select correct unx backend
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gtk/
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+ GTK2 support
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gtk3/
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+ GTK3.2+ support
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kde/
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+ KDE3 support
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kde4/
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+ KDE4 support
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generic/
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+ raw X11 support
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How the platform abstraction works
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+ InitVCL calls 'CreateSalInstance'
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+ ths is implemented by the compiled-in platform backend
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+ it stores various bits of global state in the
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'SalData' (inc/saldatabasic.hxx) structure but:
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+ the SalInstance vtable is the primary outward facing gateway
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API for platform backends
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+ It is a factory for:
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SalFrames, SalVirtualDevices, SalPrinters,
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Timers, the SolarMutexe, Drag&Drop and other
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objects, as well as the primary event loop wrapper.
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Note: references to "SV" in the code mean StarView, which was a
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portable C++ class library for GUIs, with very old roots, that was
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developed by StarDivision. Nowadays it is not used by anything except
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LibreOffice (and OpenOffice).
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