camera: add explicit close button

This workaround the slow draw-from-top gesture.

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

@@ -39,6 +39,7 @@ appscreen = lv.screen_active()
 #width = 120
 #height = 160
 
+keepgoing = True
 width = 240
 height = 240
 
@@ -48,14 +49,31 @@ cont.set_style_border_width(0, 0)
 cont.set_size(lv.pct(100), lv.pct(100))
 cont.set_scrollbar_mode(lv.SCROLLBAR_MODE.OFF)
 
-button = lv.button(cont)
-button.set_size(40, 40)
-button.align(lv.ALIGN.RIGHT_MID, 0, -20)
-def snap_button(e):
+snap_button = lv.button(cont)
+snap_button.set_size(60, 60)
+snap_button.align(lv.ALIGN.RIGHT_MID, 0, -20)
+snap_label = lv.label(snap_button)
+snap_label.set_text(lv.SYMBOL.OK)
+snap_label.center()
+def snap_button_click(e):
     print("Picture taken!")
     # TODO: keep it on-screen for a while, or save it to storage, or show it in miniature
 
-button.add_event_cb(snap_button,lv.EVENT.CLICKED,None)
+snap_button.add_event_cb(snap_button_click,lv.EVENT.CLICKED,None)
+
+
+close_button = lv.button(cont)
+close_button.set_size(40,40)
+close_button.align(lv.ALIGN.TOP_RIGHT, 0, 0)
+close_label = lv.label(close_button)
+close_label.set_text(lv.SYMBOL.CLOSE)
+close_label.center()
+def close_button_click(e):
+    global keepgoing
+    print("Closing camera!")
+    keepgoing = False
+
+close_button.add_event_cb(close_button_click,lv.EVENT.CLICKED,None)
 
 
 from camera import Camera, GrabMode, PixelFormat, FrameSize, GainCeiling
@@ -134,9 +152,11 @@ try_capture()
 
 
 import time
-while appscreen == lv.screen_active():
+while appscreen == lv.screen_active() and keepgoing:
     try_capture()
     time.sleep_ms(100) # Allow for the MicroPython REPL to still work. Reducing it doesn't seem to affect the on-display FPS.
 
 print("App backgrounded, deinitializing camera...")
 cam.deinit()
+
+show_launcher()

internal_filesystem/main.py

@@ -240,9 +240,9 @@ launcher_label.center()
 launcher_label.set_style_text_color(COLOR_DRAWER_BUTTONTEXT,0)
 def launcher_event(e):
     print("Launcher button pressed!")
-    global drawer_open,rootscreen
+    global drawer_open
     close_drawer(True)
-    lv.screen_load(rootscreen)
+    show_launcher()
 
 launcher_btn.add_event_cb(launcher_event,lv.EVENT.CLICKED,None)
 #
@@ -330,6 +330,7 @@ def execute_script(script_source, is_file, is_launcher, is_graphical):
                 'start_app': start_app, # for launcher apps
                 'parse_manifest': parse_manifest, # for launcher apps
                 'restart_launcher': restart_launcher, # for appstore apps
+                'show_launcher': show_launcher, # for apps that want to show the launcher
                 '__name__': "__main__"
             }
         print(f"Thread {thread_id}: starting script")
@@ -393,6 +394,11 @@ def start_app(app_dir, is_launcher=False):
     else:
         close_bar()
 
+def show_launcher():
+    global rootscreen
+    open_bar()
+    lv.screen_load(rootscreen)
+
 def restart_launcher():
     # No need to stop the other launcher first, because it exits after building the screen
     start_app_by_name("com.example.launcher", True)