Implement EV_WIDGET_DRAW and call screen_widget_broadcast() on screen loads

src/main.c

@@ -60,6 +60,7 @@ void tft_demo(void)
     return;
   }
   screen_add_default_widgets(s_screen);
+  screen_widget_broadcast(s_screen, EV_WIDGET_DRAW, NULL);
   LOG(LL_INFO, ("Screen '%s' has %d widgets", s_screen->name, screen_get_num_widgets(s_screen)));
 }
 

src/widget_battery.c

@@ -65,6 +65,7 @@ void widget_battery_ev(int ev, struct widget_t *w, void *ev_data) {
       LOG(LL_INFO, ("Monitoring LiPo voltage on gpio=%d", WIDGET_BATTERY_ADC_PIN));
       mgos_adc_enable(WIDGET_BATTERY_ADC_PIN);
       mgos_prometheus_metrics_add_handler(prometheus_battery_metrics_fn, NULL);
+      break;
     case EV_WIDGET_DRAW:
     case EV_WIDGET_REDRAW:
     case EV_WIDGET_TIMER:

src/widget_default.c

@@ -78,7 +78,6 @@ void screen_add_default_widgets(struct screen_t *screen) {
 
 static void widget_default_loadscreen(struct widget_t *w, void *ev_data) {
   struct screen_t *new_screen;
-  char *new_screen_filename;
 
   if (!w)
     return;
@@ -87,20 +86,18 @@ static void widget_default_loadscreen(struct widget_t *w, void *ev_data) {
     return;
   }
 
-  // screen_destroy will destroy our widget *w, so take what we need to continue
-  new_screen_filename=strdup(w->user_data);
 
-  screen_destroy(&s_screen);
+  new_screen = screen_create_from_file(w->user_data, widget_default_ev, NULL);
-
-  new_screen = screen_create_from_file(new_screen_filename, widget_default_ev, NULL);
-  free(new_screen_filename);
   if (!new_screen) {
     LOG(LL_ERROR, ("Could not load screen"));
     return;
   }
   screen_add_default_widgets(new_screen);
+
   LOG(LL_INFO, ("Navigating to new screen '%s' which has %d widgets", new_screen->name, screen_get_num_widgets(new_screen)));
+  screen_destroy(&s_screen);
   s_screen = new_screen;
+  screen_widget_broadcast(s_screen, EV_WIDGET_DRAW, NULL);
 
   (void) ev_data;
 }
@@ -116,6 +113,7 @@ void widget_default_ev(int ev, struct widget_t *w, void *ev_data) {
 
   switch(ev) {
     case EV_WIDGET_CREATE:
+      break;
     case EV_WIDGET_DRAW:
     case EV_WIDGET_REDRAW:
     case EV_WIDGET_TIMER:

src/widget_name.c

@@ -74,6 +74,7 @@ void widget_name_ev(int ev, struct widget_t *w, void *ev_data) {
 
   switch(ev) {
     case EV_WIDGET_CREATE:
+      break;
     case EV_WIDGET_DRAW:
     case EV_WIDGET_REDRAW:
     case EV_WIDGET_TIMER:

src/widget_network.c

@@ -58,6 +58,7 @@ void widget_network_ev(int ev, struct widget_t *w, void *ev_data) {
   switch(ev) {
     case EV_WIDGET_CREATE:
       widget_network=w;
+      break;
     case EV_WIDGET_DRAW:
     case EV_WIDGET_REDRAW:
       widget_network_render(w, ev_data);

src/widget_time.c

@@ -32,6 +32,7 @@ void widget_time_ev(int ev, struct widget_t *w, void *ev_data) {
 
   switch(ev) {
     case EV_WIDGET_CREATE:
+      break;
     case EV_WIDGET_DRAW:
     case EV_WIDGET_REDRAW:
     case EV_WIDGET_TIMER:

src/widget_topbar.c

@@ -18,6 +18,7 @@ void widget_topbar_ev(int ev, struct widget_t *w, void *ev_data) {
 
   switch(ev) {
     case EV_WIDGET_CREATE:
+      break;
     case EV_WIDGET_DRAW:
     case EV_WIDGET_REDRAW:
     case EV_WIDGET_TIMER:

src/widget_wifi.c

@@ -58,6 +58,7 @@ void widget_wifi_ev(int ev, struct widget_t *w, void *ev_data) {
 
   switch(ev) {
     case EV_WIDGET_CREATE:
+      break;
     case EV_WIDGET_DRAW:
     case EV_WIDGET_REDRAW:
     case EV_WIDGET_TIMER: