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https://github.com/koreader/koreader
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fadee1f5dc
Basically: * Use `extend` for class definitions * Use `new` for object instantiations That includes some minor code cleanups along the way: * Updated `Widget`'s docs to make the semantics clearer. * Removed `should_restrict_JIT` (it's been dead code since https://github.com/koreader/android-luajit-launcher/pull/283) * Minor refactoring of LuaSettings/LuaData/LuaDefaults/DocSettings to behave (mostly, they are instantiated via `open` instead of `new`) like everything else and handle inheritance properly (i.e., DocSettings is now a proper LuaSettings subclass). * Default to `WidgetContainer` instead of `InputContainer` for stuff that doesn't actually setup key/gesture events. * Ditto for explicit `*Listener` only classes, make sure they're based on `EventListener` instead of something uselessly fancier. * Unless absolutely necessary, do not store references in class objects, ever; only values. Instead, always store references in instances, to avoid both sneaky inheritance issues, and sneaky GC pinning of stale references. * ReaderUI: Fix one such issue with its `active_widgets` array, with critical implications, as it essentially pinned *all* of ReaderUI's modules, including their reference to the `Document` instance (i.e., that was a big-ass leak). * Terminal: Make sure the shell is killed on plugin teardown. * InputText: Fix Home/End/Del physical keys to behave sensibly. * InputContainer/WidgetContainer: If necessary, compute self.dimen at paintTo time (previously, only InputContainers did, which might have had something to do with random widgets unconcerned about input using it as a baseclass instead of WidgetContainer...). * OverlapGroup: Compute self.dimen at *init* time, because for some reason it needs to do that, but do it directly in OverlapGroup instead of going through a weird WidgetContainer method that it was the sole user of. * ReaderCropping: Under no circumstances should a Document instance member (here, self.bbox) risk being `nil`ed! * Kobo: Minor code cleanups.
74 lines
2.0 KiB
Lua
74 lines
2.0 KiB
Lua
--[[--
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This is a generic Widget interface, which is the base class for all other widgets.
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Widgets can be queried about their size and can be painted on screen.
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that's it for now. Probably we need something more elaborate
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later.
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If the table that was given to us as parameter has an "init"
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method, it will be called. use this to set _instance_ variables
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rather than class variables.
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]]
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local EventListener = require("ui/widget/eventlistener")
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--- Widget base class
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-- @table Widget
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local Widget = EventListener:extend{}
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--[[--
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Use this method to define a widget subclass that's inherited from a base class widget.
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It only setups the metatable (or prototype chain) and will not initiate a real instance, i.e. call self:init().
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@tparam table subclass
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@treturn Widget
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]]
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function Widget:extend(subclass_prototype)
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local o = subclass_prototype or {}
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setmetatable(o, self)
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self.__index = self
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return o
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end
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--[[--
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Use this method to initiate an instance of a class.
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Do NOT use it for class definitions because it also calls self:init().
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@tparam table o
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@treturn Widget
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]]
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function Widget:new(o)
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o = self:extend(o)
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-- Both o._init and o.init are called on object creation.
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-- But o._init is used for base widget initialization (basic components used to build other widgets).
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-- While o.init is for higher level widgets, for example Menu.
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if o._init then o:_init() end
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if o.init then o:init() end
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return o
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end
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--[[
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FIXME: Enable this doc section once we've verified all self.dimen are Geom objects
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so we can return self.dimen:copy() instead of a live ref.
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Return size of the widget.
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@treturn ui.geometry.Geom
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--]]
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function Widget:getSize()
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return self.dimen
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end
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--[[--
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Paint widget to a BlitBuffer.
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@tparam BlitBuffer bb BlitBuffer to paint to.
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If it's the screen BlitBuffer, then widget will show up on screen refresh.
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@int x x offset within the BlitBuffer
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@int y y offset within the BlitBuffer
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]]
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function Widget:paintTo(bb, x, y)
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end
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return Widget
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