koreader/frontend/ui/reader/readerpaging.lua

ReaderPaging = InputContainer:new{
	current_page = 0,
	number_of_pages = 0
}

function ReaderPaging:init()
	if Device:isTouchDevice() then
		self.ges_events = {
			TapForward = {
				GestureRange:new{
					ges = "tap",
					range = Geom:new{
						x = Screen:getWidth()/2,
						y = Screen:getHeight()/2,
						w = Screen:getWidth(),
						h = Screen:getHeight()
					}
				}
			},
			TapBackward = {
				GestureRange:new{
					ges = "tap",
					range = Geom:new{
						x = 0, 
						y = Screen:getHeight()/2,
						w = Screen:getWidth()/2,
						h = Screen:getHeight()/2,
					}
				}
			}
		}
	else
		self.key_events = {
			GotoNextPage = { 
				{Input.group.PgFwd}, doc = "go to next page",
				event = "GotoPageRel", args = 1 },
			GotoPrevPage = { 
				{Input.group.PgBack}, doc = "go to previous page",
				event = "GotoPageRel", args = -1 },

			GotoFirst = { 
				{"1"}, doc = "go to start", event = "GotoPercent", args = 0},
			Goto11 = { 
				{"2"}, doc = "go to 11%", event = "GotoPercent", args = 11},
			Goto22 = { 
				{"3"}, doc = "go to 22%", event = "GotoPercent", args = 22},
			Goto33 = { 
				{"4"}, doc = "go to 33%", event = "GotoPercent", args = 33},
			Goto44 = { 
				{"5"}, doc = "go to 44%", event = "GotoPercent", args = 44},
			Goto55 = { 
				{"6"}, doc = "go to 55%", event = "GotoPercent", args = 55},
			Goto66 = { 
				{"7"}, doc = "go to 66%", event = "GotoPercent", args = 66},
			Goto77 = { 
				{"8"}, doc = "go to 77%", event = "GotoPercent", args = 77},
			Goto88 = { 
				{"9"}, doc = "go to 88%", event = "GotoPercent", args = 88},
			GotoLast = { 
				{"0"}, doc = "go to end", event = "GotoPercent", args = 100},
		}
	end
	self.number_of_pages = self.ui.document.info.number_of_pages
end

-- wrapper for bounds checking
function ReaderPaging:gotoPage(number)
	if number == self.current_page then
		return true
	end
	if number > self.number_of_pages
	or number < 1 then
		DEBUG("wrong page number: "..number.."!")
		return false
	end
	DEBUG("going to page number", number)

	-- this is an event to allow other controllers to be aware of this change
	self.ui:handleEvent(Event:new("PageUpdate", number))

	return true
end

function ReaderPaging:onReadSettings(config)
	self:gotoPage(config:readSetting("last_page") or 1)
end

function ReaderPaging:onPageUpdate(new_page_no)
	self.current_page = new_page_no
end

function ReaderPaging:onGotoPercent(percent)
	DEBUG("goto document offset in percent:", percent)
	local dest = math.floor(self.number_of_pages * percent / 100)
	if dest < 1 then dest = 1 end
	if dest > self.number_of_pages then
		dest = self.number_of_pages
	end
	self:gotoPage(dest)
	return true
end

function ReaderPaging:onGotoPageRel(diff)
	DEBUG("goto relative page:", diff)
	self:gotoPage(self.current_page + diff)
	return true
end

function ReaderPaging:onCloseDocument()
	self.ui.doc_settings:saveSetting("last_page", self.current_page)
end

function ReaderPaging:onTapForward()
	self:onGotoPageRel(1)
	return true
end

function ReaderPaging:onTapBackward()
	self:onGotoPageRel(-1)
	return true
end