add screen rotate support

frontend/ui/reader/readermenu.lua

@@ -8,17 +8,46 @@ function ReaderMenu:onShowMenu()
 	local item_table = {}
 
 	table.insert(item_table, {
-		text = "Switch zoom mode",
+		text = "Screen rotate",
 		sub_item_table = {
 			{
-				text = "Zoom to fit content width",
+				text = "rotate 90 degree clockwise",
+				callback = function()
+					Screen:screenRotate("clockwise")
+					self.ui:handleEvent(Event:new("SetDimensions", Screen:getSize()))
+				end
 			},
 			{
-				text = "Zoom to fit content height",
+				text = "rotate 90 degree anticlockwise",
+				callback = function()
+					Screen:screenRotate("anticlockwise")
+					self.ui:handleEvent(Event:new("SetDimensions", Screen:getSize()))
+				end
 			},
 		}
 	})
 
+	if self.ui.document.info.has_pages then
+		table.insert(item_table, {
+			text = "Switch zoom mode",
+			sub_item_table = {
+				{
+					text = "Zoom to fit content width",
+				},
+				{
+					text = "Zoom to fit content height",
+				},
+			}
+		})
+	else
+		table.insert(item_table, {
+			text = "Font menu",
+			callback = function()
+				self.ui:handleEvent(Event:new("ShowFontMenu"))
+			end
+		})
+	end
+
 	table.insert(item_table, {
 		text = "Return to file browser"
 	})
@@ -30,6 +59,12 @@ function ReaderMenu:onShowMenu()
 		height = #item_table + 3 * 28
 	}
 
+	function main_menu:onMenuChoice(item)
+		if item.callback then
+			item.callback()
+		end
+	end
+
 	UIManager:show(main_menu)
 
 	return true