[FL-1905] Fix power off notification (#748)

* view dispatcher: add set view front API
* power: add power off notification
* Gui: rename ViewPort `send_to` API.
* Makefile: add blackmagick support

Co-authored-by: Aleksandr Kutuzov <alleteam@gmail.com>

applications/power/power_service/power.c

@@ -41,6 +41,10 @@ Power* power_alloc() {
 
     // Gui
     power->view_dispatcher = view_dispatcher_alloc();
+    power->popup = popup_alloc();
+    popup_set_header(
+        power->popup, "Disconnect USB for safe\nshutdown", 64, 26, AlignCenter, AlignTop);
+    view_dispatcher_add_view(power->view_dispatcher, PowerViewPopup, popup_get_view(power->popup));
     power->power_off = power_off_alloc();
     view_dispatcher_add_view(
         power->view_dispatcher, PowerViewOff, power_off_get_view(power->power_off));
@@ -63,6 +67,8 @@ void power_free(Power* power) {
     // Gui
     view_dispatcher_remove_view(power->view_dispatcher, PowerViewOff);
     power_off_free(power->power_off);
+    view_dispatcher_remove_view(power->view_dispatcher, PowerViewPopup);
+    popup_free(power->popup);
     view_port_free(power->battery_view_port);
 
     // State
@@ -124,6 +130,7 @@ static void power_check_low_battery(Power* power) {
     // Check battery charge and vbus voltage
     if((power->info.charge == 0) && (power->info.voltage_vbus < 4.0f)) {
         if(!power->battery_low) {
+            view_dispatcher_send_to_front(power->view_dispatcher);
             view_dispatcher_switch_to_view(power->view_dispatcher, PowerViewOff);
         }
         power->battery_low = true;
@@ -139,7 +146,7 @@ static void power_check_low_battery(Power* power) {
         if(power->power_off_timeout) {
             power_off_set_time_left(power->power_off, power->power_off_timeout--);
         } else {
-            power_off();
+            power_off(power);
         }
     }
 }

applications/power/power_service/power_api.c

@@ -3,8 +3,13 @@
 #include "furi-hal-power.h"
 #include "furi-hal-boot.h"
 
-void power_off() {
+void power_off(Power* power) {
     furi_hal_power_off();
+    // Notify user if USB is plugged
+    view_dispatcher_send_to_front(power->view_dispatcher);
+    view_dispatcher_switch_to_view(power->view_dispatcher, PowerViewPopup);
+    osDelay(10);
+    furi_crash("Disconnect USB for safe shutdown");
 }
 
 void power_reboot(PowerBootMode mode) {

applications/power/power_service/power_i.h

@@ -5,6 +5,8 @@
 #include <stdint.h>
 #include <gui/view_dispatcher.h>
 #include <gui/gui.h>
+
+#include <gui/modules/popup.h>
 #include "views/power_off.h"
 
 #include <notification/notification-messages.h>
@@ -17,6 +19,7 @@ typedef enum {
 
 struct Power {
     ViewDispatcher* view_dispatcher;
+    Popup* popup;
     PowerOff* power_off;
 
     ViewPort* battery_view_port;
@@ -34,4 +37,7 @@ struct Power {
     uint8_t power_off_timeout;
 };
 
-typedef enum { PowerViewOff } PowerView;
+typedef enum {
+    PowerViewPopup,
+    PowerViewOff,
+} PowerView;