koreader/frontend/ui/widget/toggleswitch.lua

ToggleLabel = TextWidget:new{
	bgcolor = 0,
	fgcolor = 1,
}

function ToggleLabel:paintTo(bb, x, y)
	renderUtf8Text(bb, x, y+self._height*0.75, self.face, self.text, true, self.bgcolor, self.fgcolor)
end

ToggleSwitch = InputContainer:new{
	width = scaleByDPI(216),
	height = scaleByDPI(30),
}

function ToggleSwitch:init()
	self.n_pos = #self.toggle
	self.position = nil

	local label_font_face = "cfont"
	local label_font_size = 16

	self.toggle_frame = FrameContainer:new{background = 0, color = 7, radius = 7, bordersize = 1, padding = 2,}
	self.toggle_content = HorizontalGroup:new{}

	for i=1,#self.toggle do
		local label = ToggleLabel:new{
			align = "center",
			text = self.toggle[i],
			face = Font:getFace(label_font_face, label_font_size),
		}
		local content = CenterContainer:new{
			dimen = Geom:new{w = self.width/self.n_pos, h = self.height},
			label,
		}
		local button = FrameContainer:new{
			background = 0,
			color = 7,
			margin = 0,
			radius = 5,
			bordersize = 1,
			padding = 0,
			content,
		}
		table.insert(self.toggle_content, button)
	end

	self.toggle_frame[1] = self.toggle_content
	self[1] = self.toggle_frame
	self.dimen = Geom:new(self.toggle_frame:getSize())
	if Device:isTouchDevice() then
		self.ges_events = {
			TapSelect = {
				GestureRange:new{
					ges = "tap",
					range = self.dimen,
				},
				doc = _("Toggle switch"),
			},
		}
	end
end

function ToggleSwitch:update()
	local pos = self.position
	for i=1,#self.toggle_content do
		if pos == i then
			self.toggle_content[i].color = 7
			self.toggle_content[i].background = 7
			self.toggle_content[i][1][1].bgcolor = 0.5
			self.toggle_content[i][1][1].fgcolor = 0.0
		else
			self.toggle_content[i].color = 0
			self.toggle_content[i].background = 0
			self.toggle_content[i][1][1].bgcolor = 0.0
			self.toggle_content[i][1][1].fgcolor = 1.0
		end
	end
end

function ToggleSwitch:setPosition(position)
	self.position = position
	self:update()
end

function ToggleSwitch:togglePosition(position)
	if self.n_pos == 2 and self.alternate ~= false then
		self.position = (self.position+1)%self.n_pos
		self.position = self.position == 0 and self.n_pos or self.position
	else
		self.position = position
	end
	self:update()
end

function ToggleSwitch:onTapSelect(arg, gev)
	local position = math.ceil(
		(gev.pos.x - self.dimen.x) / self.dimen.w * self.n_pos
	)
	--DEBUG("toggle position:", position)
	self:togglePosition(position)
	local option_value = nil
	local option_arg = nil
	if self.values then
		self.values = self.values or {}
		option_value = self.values[self.position]
		self.config:onConfigChoice(self.name, option_value)
	end
	if self.event then
		self.args = self.args or {}
		option_arg = self.args[self.position]
		self.config:onConfigEvent(self.event, option_arg)
	end
	if self.events then
		for i=1,#self.events do
			self.events[i].args = self.events[i].args or {}
			option_arg = self.events[i].args[self.position]
			self.config:onConfigEvent(self.events[i].event, option_arg)
		end
	end
	UIManager.repaint_all = true
end