add setViewMode handler for readerrolling and readerview

frontend/ui/reader/readerrolling.lua

@@ -163,7 +163,7 @@ function ReaderRolling:onZoom()
 end
 
 --[[
-	remember to signal this event the document has been zoomed,
+	remember to signal this event when the document has been zoomed,
 	font has been changed, or line height has been changed.
 --]]
 function ReaderRolling:onUpdatePos()
@@ -178,6 +178,10 @@ function ReaderRolling:onUpdatePos()
 	return true
 end
 
+function ReaderRolling:onSetViewMode(new_mode)
+	self.ui.view_mode = new_mode
+end
+
 --[[
 	PosUpdate event is used to signal other widgets that pos has been changed.
 --]]

frontend/ui/reader/readerview.lua

@@ -167,6 +167,11 @@ function ReaderView:onHintPage()
 	self.ui.document:hintPage(self.state.page+1, self.state.zoom, self.state.rotation)
 end
 
+function ReaderView:onSetViewMode(new_mode)
+	self.ui.view_mode = new_mode
+	self.ui.document:setViewMode(new_mode)
+end
+
 function ReaderView:onCloseDocument()
 	self.ui.doc_settings:saveSetting("render_mode", self.render_mode)
 end