move toc related methods to readertoc.lua

frontend/ui/reader/readertoc.lua

@@ -3,6 +3,7 @@ ReaderToc = InputContainer:new{
 		ShowToc = { {"T"}, doc = "show Table of Content menu"},
 	},
 	dimen = Geom:new{ w = G_width-20, h = G_height-20},
+	current_page = 0,
 }
 
 function ReaderToc:cleanUpTocTitle(title)
@@ -13,6 +14,41 @@ function ReaderToc:onSetDimensions(dimen)
 	self.dimen = dimen
 end
 
+--function ReaderToc:fillToc()
+	--self.toc = self.doc:getToc()
+--end
+
+-- getTocTitleByPage wrapper, so specific reader
+-- can tranform pageno according its need
+function ReaderToc:getTocTitleByPage(pageno)
+	return self:_getTocTitleByPage(pageno)
+end
+
+function ReaderToc:_getTocTitleByPage(pageno)
+	if not self.toc then
+	-- build toc when needed.
+	self:fillToc()
+	end
+
+	-- no table of content
+	if #self.toc == 0 then
+		return ""
+	end
+
+	local pre_entry = self.toc[1]
+	for _k,_v in ipairs(self.toc) do
+		if _v.page > pageno then
+			break
+		end
+		pre_entry = _v
+	end
+	return self:cleanUpTocTitle(pre_entry.title)
+end
+
+function ReaderToc:getTocTitleOfCurrentPage()
+	return self:getTocTitleByPage(self.pageno)
+end
+
 function ReaderToc:onShowToc()
 	function callback(item)
 		self.ui:handleEvent(Event:new("PageUpdate", item.page))
@@ -34,3 +70,8 @@ function ReaderToc:onShowToc()
 	UIManager:show(toc_menu)
 end
 
+function ReaderToc:onPageUpdate(new_page_no)
+	self.current_page = new_page_no
+end
+
+