mirror of
https://github.com/koreader/koreader
synced 2024-11-20 03:25:34 +00:00
76 lines
1.9 KiB
Lua
76 lines
1.9 KiB
Lua
--[[--
|
|
This is a generic Widget interface, which is the base class for all other widgets.
|
|
|
|
Widgets can be queried about their size and can be painted on screen.
|
|
that's it for now. Probably we need something more elaborate
|
|
later.
|
|
|
|
If the table that was given to us as parameter has an "init"
|
|
method, it will be called. use this to set _instance_ variables
|
|
rather than class variables.
|
|
]]
|
|
|
|
local EventListener = require("ui/widget/eventlistener")
|
|
|
|
--- Widget base class
|
|
-- @table Widget
|
|
local Widget = EventListener:new()
|
|
|
|
--[[--
|
|
Use this method to define a subclass widget class that's inherited from a
|
|
base class widget. It only setups the metabale (or prototype chain) and will
|
|
not initiate a real instance, i.e. call self:init().
|
|
|
|
@tparam Widget baseclass
|
|
@treturn Widget
|
|
]]
|
|
function Widget:extend(baseclass)
|
|
local o = baseclass or {}
|
|
setmetatable(o, self)
|
|
self.__index = self
|
|
return o
|
|
end
|
|
|
|
--[[--
|
|
Use this method to initiatie a instance of a class, don't use it for class
|
|
definition because it also calls self:init().
|
|
|
|
@tparam Widget o
|
|
@treturn Widget
|
|
]]
|
|
function Widget:new(o)
|
|
o = self:extend(o)
|
|
-- Both o._init and o.init are called on object creation. But o._init is
|
|
-- used for base widget initialization (basic component used to build other
|
|
-- widgets). While o.init is for higher level widgets, for example Menu
|
|
-- Widget
|
|
if o._init then o:_init() end
|
|
if o.init then o:init() end
|
|
return o
|
|
end
|
|
|
|
--[[
|
|
FIXME: enable this doc section when we verified all self.dimen is a Geom so we
|
|
can return self.dime:copy().
|
|
|
|
Return size of the widget.
|
|
|
|
@treturn ui.geometry.Geom
|
|
--]]
|
|
function Widget:getSize()
|
|
return self.dimen
|
|
end
|
|
|
|
--[[--
|
|
Paint widget to a BlitBuffer.
|
|
|
|
@tparam BlitBuffer bb BlitBuffer to paint to. If it's the screen BlitBuffer, then
|
|
widget will show up on screen refresh.
|
|
@int x x offset within the BlitBuffer
|
|
@int y y offset within the BlitBuffer
|
|
]]
|
|
function Widget:paintTo(bb, x, y)
|
|
end
|
|
|
|
return Widget
|