mirror of
https://github.com/koreader/koreader
synced 2024-11-10 01:10:34 +00:00
88 lines
2.8 KiB
Lua
88 lines
2.8 KiB
Lua
--[[--
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A layout widget that puts objects above each other.
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--]]
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local BD = require("ui/bidi")
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local WidgetContainer = require("ui/widget/container/widgetcontainer")
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local OverlapGroup = WidgetContainer:new{
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-- Note: we default to allow_mirroring = true.
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-- When using LeftContainer, RightContainer or HorizontalGroup
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-- in an OverlapGroup, mostly when they take the whole width,
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-- either OverlapGroup, or all the others, need to have
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-- allow_mirroring=false (otherwise, some upper mirroring would
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-- cancel a lower one...).
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-- It's usually safer to set it to false on the OverlapGroup,
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-- but some thinking is needed when many of them are nested.
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allow_mirroring = true,
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_mirroredUI = BD.mirroredUILayout(),
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_size = nil,
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}
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function OverlapGroup:getSize()
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if not self._size then
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self._size = {w = 0, h = 0}
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self._offsets = { x = math.huge, y = math.huge }
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for i, widget in ipairs(self) do
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local w_size = widget:getSize()
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if self._size.h < w_size.h then
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self._size.h = w_size.h
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end
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if self._size.w < w_size.w then
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self._size.w = w_size.w
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end
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end
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end
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return self._size
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end
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function OverlapGroup:initDimen()
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self:getSize() -- populate self._size
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-- sync self._size with self.dimen, self.dimen has higher priority
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if self.dimen.w then
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self._size.w = self.dimen.w
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else
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self.dimen.w = self._size.w
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end
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if self.dimen.h then
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self._size.h = self.dimen.h
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else
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self.dimen.h = self._size.h
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end
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end
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function OverlapGroup:paintTo(bb, x, y)
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local size = self:getSize()
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for i, wget in ipairs(self) do
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local wget_size = wget:getSize()
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local overlap_align = wget.overlap_align
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if self._mirroredUI and self.allow_mirroring then
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-- Checks in the same order as how they are checked below
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if overlap_align == "right" then
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overlap_align = "left"
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elseif overlap_align == "center" then
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overlap_align = "center"
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elseif wget.overlap_offset then
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wget.overlap_offset[1] = size.w - wget_size.w - wget.overlap_offset[1]
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else
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overlap_align = "right"
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end
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-- see if something to do with wget.overlap_offset
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end
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if overlap_align == "right" then
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wget:paintTo(bb, x+size.w-wget_size.w, y)
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elseif overlap_align == "center" then
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wget:paintTo(bb, x+math.floor((size.w-wget_size.w)/2), y)
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elseif wget.overlap_offset then
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wget:paintTo(bb, x+wget.overlap_offset[1], y+wget.overlap_offset[2])
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else
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-- default to left
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wget:paintTo(bb, x, y)
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end
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end
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end
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return OverlapGroup
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