[iOS] Notch support

ios/ViewController.mm

@@ -148,6 +148,16 @@ - (void)subtleVolume:(SubtleVolume *)volumeView willChange:(CGFloat)value {
 - (void)subtleVolume:(SubtleVolume *)volumeView didChange:(CGFloat)value {
 }
 
+- (void)viewSafeAreaInsetsDidChange {
+    [super viewSafeAreaInsetsDidChange];
+    if (@available(iOS 11.0, *)) {
+        char safeArea[100];
+        // we use 0.0f instead of safeAreaInsets.bottom because the bottom overlay isn't disturbing (for now)
+        snprintf(safeArea, sizeof(safeArea), "%f:%f:%f:%f", self.view.safeAreaInsets.left, self.view.safeAreaInsets.right, self.view.safeAreaInsets.top, 0.0f);
+        System_SendMessage("safe_insets", safeArea);
+    }
+}
+
 - (void)viewDidLoad {
 	[super viewDidLoad];
 	[[DisplayManager shared] setupDisplayListener];

ios/main.mm

@@ -46,6 +46,11 @@ kern_return_t catch_exception_raise(mach_port_t exception_port,
 	return NULL;
 }
 
+static float g_safeInsetLeft = 0.0;
+static float g_safeInsetRight = 0.0;
+static float g_safeInsetTop = 0.0;
+static float g_safeInsetBottom = 0.0;
+
 
 std::string System_GetProperty(SystemProperty prop) {
 	switch (prop) {
@@ -73,6 +78,14 @@ float System_GetPropertyFloat(SystemProperty prop) {
 	switch (prop) {
 	case SYSPROP_DISPLAY_REFRESH_RATE:
 		return 60.f;
+	case SYSPROP_DISPLAY_SAFE_INSET_LEFT:
+		return g_safeInsetLeft;
+	case SYSPROP_DISPLAY_SAFE_INSET_RIGHT:
+		return g_safeInsetRight;
+	case SYSPROP_DISPLAY_SAFE_INSET_TOP:
+		return g_safeInsetTop;
+	case SYSPROP_DISPLAY_SAFE_INSET_BOTTOM:
+		return g_safeInsetBottom;
 	default:
 		return -1;
 	}
@@ -116,6 +129,14 @@ void System_SendMessage(const char *command, const char *parameter) {
 		} else if (!strcmp(parameter, "close")) {
 			stopLocation();
 		}
+	} else if (!strcmp(command, "safe_insets")) {
+		float left, right, top, bottom;
+		if (4 == sscanf(parameter, "%f:%f:%f:%f", &left, &right, &top, &bottom)) {
+			g_safeInsetLeft = left;
+			g_safeInsetRight = right;
+			g_safeInsetTop = top;
+			g_safeInsetBottom = bottom;
+		}
 	}
 }