fix and simplify lvgltest

internal_filesystem/apps/com.example.helloworld/assets/hello.py

@@ -2,7 +2,7 @@
 
 # Initialize
 
-import display_driver
+import display_driver # not needed, but included because the LVGL simulator does it
 import lvgl as lv
 
 # Create a button with a label
@@ -17,17 +17,10 @@ lv.screen_load(scr)
 # END OF COPY-PASTE FROM https://sim.lvgl.io/v9.0/micropython/ports/webassembly/
 
 
-def check_running(timer):
-    if lv.screen_active() == scr:
-        print("hello.py is still foreground")
-    else:
+def janitor_cb(timer):
+    if lv.screen_active() != scr:
         print("hello.py lost foreground, cleaning up...")
-        timer1.delete()
+        janitor.delete()
+        # No cleanups to do, but in a real app, you might stop timers, deinitialize hardware devices you used, close network connections, etc.
 
-timer1 = lv.timer_create(check_running, 1000, None)
-
-# Added: wait until the user navigates away instead of stopping immediately.
-#while lv.screen_active() == scr:
-#    import time
-#    time.sleep_ms(100)
-#print("User navigated away from the HelloWorld app. Bye bye!")
+janitor = lv.timer_create(janitor_cb, 1000, None)

internal_filesystem/apps/com.example.lvgltest/assets/lvgltest.py

@@ -1,5 +1,3 @@
-appscreen = lv.screen_active()
-
 import time
 import random
 
@@ -10,7 +8,7 @@ SPINNER_SIZE = 40   # Size of each spinner in pixels
 spinner_count = 0
 metrics_label = None
 
-def add_spinner_and_update(timer):
+def add_spinner(timer):
     global spinner_count, metrics_label
     try:
         x = random.randint(0, appscreen.get_width() - SPINNER_SIZE)
@@ -27,27 +25,22 @@ def add_spinner_and_update(timer):
     metrics_label.set_text(f"Spinners: {spinner_count}")
     print(f"Finished adding spinner {spinner_count}")
 
-def run_benchmark():
-    global spinner_count, metrics_label
-    print("Starting LVGL spinner benchmark...")
-    metrics_label = lv.label(appscreen)
-    metrics_label.set_style_text_color(lv.color_white(), 0)
-    metrics_label.set_style_bg_color(lv.color_black(), 0)
-    metrics_label.set_style_bg_opa(lv.OPA.COVER, 0)
-    metrics_label.set_pos(10, 10)
-    metrics_label.set_text("Spinners: 0")
-    timer = lv.timer_create(add_spinner_and_update, 2000, None)
-    th.disable() # taskhandler control is necessary, otherwise there are concurrency issues
-    while appscreen == lv.screen_active():
-        lv.task_handler()
-        time.sleep_ms(10)
-        lv.tick_inc(10)
-    th.enable()
-    timer.delete()
 
-try:
-    run_benchmark()
-except Exception as e:
-    print(f"Error in benchmark: {e}")
+def janitor_cb(timer):
+    if lv.screen_active() != appscreen:
+        print("lvgltest.py lost foreground, cleaning up...")
+        janitor.delete()
+        add_spinner_timer.delete()
+
+appscreen = lv.screen_active()
+metrics_label = lv.label(appscreen)
+metrics_label.set_style_text_color(lv.color_white(), 0)
+metrics_label.set_style_bg_color(lv.color_black(), 0)
+metrics_label.set_style_bg_opa(lv.OPA.COVER, 0)
+metrics_label.set_pos(10, 10)
+metrics_label.set_text("Spinners: 0")
+
+print("Starting LVGL spinner benchmark...")
+janitor = lv.timer_create(janitor_cb, 500, None)
+add_spinner_timer = lv.timer_create(add_spinner, 2000, None)
 
-print("lvgltest.py exiting")