koreader/frontend/ui/widget/buttontable.lua

require "ui/widget/base"
require "ui/widget/line"

ButtonTable = VerticalGroup:new{
	width = Screen:getWidth(),
	buttons = {
		{
			{text="OK", enabled=true, callback=nil},
			{text="Cancel", enabled=false, callback=nil},
		},
	},
	sep_width = scaleByDPI(1),
	padding = scaleByDPI(2),
	
	zero_sep = false,
	button_font_face = "cfont",
	button_font_size = 20,
}

function ButtonTable:init()
	--local vertical_group = VerticalGroup:new{}
	if self.zero_sep then
		self:addHorizontalSep()
	end
	for i = 1, #self.buttons do
		local horizontal_group = HorizontalGroup:new{}
		local line = self.buttons[i]
		local sizer_space = self.sep_width * (#line - 1) + 2
		for j = 1, #line do
			local button = Button:new{
				text = line[j].text,
				enabled = line[j].enabled,
				callback = line[j].callback,
				width = (self.width - sizer_space)/#line,
				bordersize = 0,
				margin = 0,
				padding = 0,
				text_font_face = self.button_font_face,
				text_font_size = self.button_font_size,
			}
			local button_dim = button:getSize()
			local vertical_sep = LineWidget:new{
				background = 8,
				dimen = Geom:new{
					w = self.sep_width,
					h = button_dim.h,
				}
			}
			table.insert(horizontal_group, button)
			if j < #line then
				table.insert(horizontal_group, vertical_sep)
			end
		end -- end for each button
		table.insert(self, horizontal_group)
		if i < #self.buttons then
			self:addHorizontalSep()
		end
	end -- end for each button line
end

function ButtonTable:addHorizontalSep()
	table.insert(self, VerticalSpan:new{ width = scaleByDPI(2) })
	table.insert(self, LineWidget:new{
		background = 8,
		dimen = Geom:new{
			w = self.width,
			h = self.sep_width,
		}
	})
	table.insert(self, VerticalSpan:new{ width = scaleByDPI(2) })
end