From b6597650af15eff6d9730a97d6a84e1708b89b4d Mon Sep 17 00:00:00 2001
From: Gabriel Tofvesson <gabriel@tofvesson.se>
Date: Tue, 8 Oct 2024 18:14:24 +0200
Subject: [PATCH] Add tab controls

---
 itemcontroller.lua | 86 +++++++++++++++++++++++++++++++++++++++-------
 1 file changed, 73 insertions(+), 13 deletions(-)

diff --git a/itemcontroller.lua b/itemcontroller.lua
index a2db066..b417fd6 100644
--- a/itemcontroller.lua
+++ b/itemcontroller.lua
@@ -70,15 +70,57 @@ local function loadState(fname, node)
   return controller
 end
 
+local function itemList(groups, wBudget, hBudget, savedState, onClick, setPage)
+  local state = savedState or {}
+  state.tab = state.tab or 1
+
+  local pages = math.ceil(#groups / (hBudget - 1))
+
+  -- Tab controls
+  local btnPrev = Text:new{
+    text = " < ",
+    bgColor = state.tab == 1 and colors.black or colors.gray,
+    fgColor = state.tab == 1 and colors.red or colors.white,
+    x = 1,
+    onClick = function(e, x, y, s)
+      if state.tab > 1 then
+        state.tab = state.tab - 1
+        setPage(nil)
+      end
+    end
+  }
+
+  local btnNext = Text:new{
+    text = " > ",
+    bgColor = state.tab == pages and colors.black or colors.gray,
+    fgColor = state.tab == pages and colors.red or colors.white,
+    x = wBudget - 3,
+    onClick = function(e, x, y, s)
+      if state.tab < pages then
+        state.tab = state.tab + 1
+        setPage(nil)
+      end
+    end
+  }
+
+  local tabLine = List:new{
+    children = {
+      btnPrev,
+      btnNext
+    },
+    vertical = false
+  }
 
-local function itemList(groups, wBudget, onClick)
   local bgColors = {
     colors.gray,
     colors.black
   }
+  local entryBudget = hBudget - tabLine:getHeight()
+  local entryStart = 1 + (state.tab - 1) * (entryBudget)
+  local entryEnd = math.min(state.tab * entryBudget, #groups)
   local entries = {}
 
-  for i=1,#groups do
+  for i=entryStart,entryEnd do
     local group = groups[i]
     local text = group:getDisplayName()
     local count = tostring(group:getItemCount())
@@ -119,17 +161,29 @@ local function itemList(groups, wBudget, onClick)
     table.insert(entries, list)
   end
 
+  local tabLinePad = Padding:new{
+    top = hBudget - (entryEnd - entryStart) - 1,
+    element = tabLine
+  }
+
+  table.insert(entries, tabLinePad)
+
   return List:new{
     children = entries,
     vertical = true
-  }
+  }, state
 end
 
 local function updatePageRender(state, pages)
   if state.nextPage ~= nil then
+    local changingPage = state.nextPage ~= state.currentPage
     state.currentPage = state.nextPage
     state.nextPage = nil
 
+    if changingPage then
+      state.pageState = nil
+    end
+
     state._pageRender = pages[state.currentPage](state)
   end
 end
@@ -163,15 +217,20 @@ local PAGES = {
 
     table.sort(found, function(a, b) return a:getItemCount() > b:getItemCount() end)
 
-    local subset = {}
-    for i=1,math.min(13, #found) do
-      table.insert(subset, found[i])
-    end
-
-    local listResult = itemList(subset, state.width, function(element, x, y, source, group)
-      print("Clicked: "..group:getDisplayName())
-      return true
-    end)
+    local listResult, pageState = itemList(
+      found,
+      state.width,
+      state.height,
+      state.pageState,
+      function(element, x, y, source, group)
+        print("Clicked: "..group:getDisplayName())
+        return true
+      end,
+      function(page)
+        state.nextPage = page or state.currentPage
+      end
+    )
+    state.pageState = pageState
     listResult:setParent(state.monitor)
 
     return function()
@@ -201,7 +260,8 @@ local CONTROLLER_STATE = {
   height = height,
   monitor = monitor,
   nextPage = "MAIN",
-  exit = false
+  exit = false,
+  pageState = {}
 }
 
 os.queueEvent("dummy_event")