Implement basic page-switching

itemcontroller.lua

@@ -210,6 +210,7 @@ local function updatePageRender(state, pages)
 end
 
 local function renderDefault(state, rootElement)
+  return function()
     local event = {os.pullEvent()}
     local handled = rootElement:handleEvent(event)
     if not handled and event[1] == "monitor_resize" then
@@ -229,6 +230,9 @@ local function renderDefault(state, rootElement)
   
     rootElement:draw()
   end
+end
+
+local function NOOP() end
 
 local PAGES = {
   MAIN = function(state)
@@ -248,11 +252,15 @@ local PAGES = {
       state.height,
       pageState.listState,
       function(element, x, y, source, group)
-        print("Clicked: "..group:getSimpleName())
+        state:setPage("GROUP_DETAIL", group)
         return true
       end,
       function(page)
-        state.nextPage = page or state.currentPage
+        if page == nil then
+          state:reloadPage()
+        else
+          state:setPage(page)
+        end
       end,
       function()
         print("Importing...")
@@ -267,19 +275,30 @@ local PAGES = {
         end)
         -- Force reload stacks
         state:currentPageState({}).stacks = nil
-        state.nextPage = state.currentPage
+        state:reloadPage()
       end
     )
     pageState.listState = listState
     listResult:setParent(state.monitor)
 
-    return function()
-      renderDefault(state, listResult)
-    end
+    return renderDefault(state, listResult)
   end,
 
   GROUP_DETAIL = function(state, newPage)
+    local group = state:getExtra()
+    if group == nil then
+      state:setPage("MAIN")
+      return NOOP
+    end
+    local hello = Text:new{
+      text = "Detail: "..group:getSimpleName(),
+      parent = state.monitor,
+      onClick = function(e, x, y, s)
+        state:setPage("MAIN")
+      end
+    }
 
+    return renderDefault(state, hello)
   end,
 
   REQUEST = function(state, newPage)
@@ -317,6 +336,19 @@ function CONTROLLER_STATE:currentPageState(default)
   return self.pageState[self.currentPage]
 end
 
+function CONTROLLER_STATE:setPage(page, extra)
+  self.nextPage = page
+  self.extra = extra
+end
+
+function CONTROLLER_STATE:getExtra()
+  return self.extra
+end
+
+function CONTROLLER_STATE:reloadPage()
+  self.nextPage = self.currentPage
+end
+
 while not CONTROLLER_STATE.exit do
   updatePageRender(CONTROLLER_STATE, PAGES)
   CONTROLLER_STATE._pageRender()