add lua navigation

assets/scripts/navigation.lua

@@ -1,9 +1,9 @@
 -- Navigation System for Virtual Smartphone
 -- Handles screen transitions and state management
 
--- Screen registry
+-- Screen registry - maps screen names to RML file paths
 local screens = {
-    home = "screens/home.rml",
+    home = "demo.rml",
     lock = "screens/lock.rml",
     dialer = "screens/dialer.rml",
     contacts = "screens/contacts.rml",
@@ -12,33 +12,59 @@ local screens = {
     browser = "screens/browser.rml"
 }
 
--- Current screen state
-local current_screen = "home"
-local screen_history = {}
+-- Navigation history stack
+local history = {}
 
--- Navigate to a screen
+-- Current screen name
+local current_screen = "home"
+
+-- Navigate to a screen by name
 function navigateTo(screen_name)
-    if screens[screen_name] then
-        -- Add current screen to history
-        table.insert(screen_history, current_screen)
+    local path = screens[screen_name]
+    if path then
+        -- Push current screen to history before navigating
+        table.insert(history, current_screen)
         current_screen = screen_name
 
-        -- Load the new document
-        -- Note: In RmlUi, we'd typically use document loading
-        print("Navigating to: " .. screen_name)
+        -- Load the new screen using C++ function
+        local success = loadScreen(path)
+        if success then
+            print("Navigated to: " .. screen_name)
+        else
+            -- Restore previous state on failure
+            current_screen = table.remove(history)
+            print("Failed to navigate to: " .. screen_name)
+        end
+        return success
     else
         print("Unknown screen: " .. screen_name)
+        return false
     end
 end
 
 -- Go back to previous screen
 function goBack()
-    if #screen_history > 0 then
-        current_screen = table.remove(screen_history)
-        print("Going back to: " .. current_screen)
+    if #history > 0 then
+        local previous = table.remove(history)
+        local path = screens[previous]
+        if path then
+            current_screen = previous
+            loadScreen(path)
+            print("Back to: " .. previous)
+            return true
+        end
     else
         print("No history to go back to")
     end
+    return false
+end
+
+-- Go to home screen (clear history)
+function goHome()
+    history = {}
+    current_screen = "home"
+    loadScreen(screens.home)
+    print("Navigated to home")
 end
 
 -- Get current screen name
@@ -46,9 +72,19 @@ function getCurrentScreen()
     return current_screen
 end
 
+-- Check if we can go back
+function canGoBack()
+    return #history > 0
+end
+
 -- Clear navigation history
 function clearHistory()
-    screen_history = {}
+    history = {}
+end
+
+-- Get history depth
+function getHistoryDepth()
+    return #history
 end
 
 print("Navigation system initialized")