Document control flow of LVGL usage.

Author: dhebbeker

lib/3rd_party_adapters/LVGL/seq_menu_init.puml

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+@startuml
+autoactivate on
+mainframe **seq** initialization
+
+main -> Menu : ""Menu()""
+Menu ->  GuiEngine : ""registerKeyPad()""
+note over GuiEngine
+  registers callback
+  functions for keys
+  to engine
+end note
+return
+Menu -> MenuItem : create menu items
+return
+note over Menu
+  structure menu items
+end note
+Menu -> GuiEngine : ""drawMenu()""
+GuiEngine -> ScreenMenu : ""draw()""
+note over ScreenMenu
+  create and configure screen
+end note
+loop for each item
+  note over ScreenMenu
+    depending on the type,
+    draw the menu item
+  end note
+end
+ScreenMenu -> LVGL : draw screen
+return
+note over ScreenMenu
+  add screen to stack
+end note
+return
+return
+return
+
+main -> Presenter : ""Presenter()""
+return
+
+@enduml

lib/3rd_party_adapters/LVGL/seq_menu_interaction.puml

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+@startuml
+autoactivate on
+mainframe **seq** user interaction
+
+actor User
+User -> ScreenMenu : ""ScreenMenu_submenu_cb()""
+alt enter submenu
+  ScreenMenu -> ScreenMenu : ""ScreenMenu()""
+  note over ScreenMenu
+    create submenu from
+    menu sub-items
+  end note
+  return
+  ScreenMenu -> ScreenMenu : ""draw()""
+  return
+else leave menu
+  ScreenMenu -> ScreenMenu : ""IScreen_leave()""
+  note over ScreenMenu
+    remove and delete top of stack
+  end note
+  ScreenMenu -> ScreenMenu : ""draw()""
+  return
+  return
+end
+return
+@enduml

lib/3rd_party_adapters/LVGL/seq_menu_loop.puml

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+@startuml
+autoactivate on
+mainframe **seq** loop
+
+main -> Presenter : ""loop()""
+Presenter -> Menu : ""loop()""
+Menu -> GuiEngine : ""refresh()""
+GuiEngine -> Display : ""display()""
+return
+return
+return
+return
+
+
+@enduml