subtitle in switch is optional (nano nbgl)

(cherry picked from commit df864d3)

Author: cedelavergne-ledger

lib_nbgl/src/nbgl_layout_nanos.c

@@ -103,6 +103,10 @@ static void buttonCallback(nbgl_screen_t *screen, nbgl_buttonEvent_t buttonEvent
     }
 }
 
+/**********************
+ *   GLOBAL FUNCTIONS
+ **********************/
+
 /**
  * @brief compute the max width of the first line of the given text fitting in maxWidth
  *
@@ -756,24 +760,27 @@ int nbgl_layoutAddSwitch(nbgl_layout_t *layout, const nbgl_layoutSwitch_t *switc
     textArea->obj.alignmentMarginY = 3;
     layoutAddObject(layoutInt, (nbgl_obj_t *) textArea);
 
-    // add switch description
-    textArea                  = (nbgl_text_area_t *) nbgl_objPoolGet(TEXT_AREA, layoutInt->layer);
-    textArea->textColor       = WHITE;
-    textArea->text            = PIC(switchLayout->subText);
-    textArea->textAlignment   = CENTER;
-    textArea->fontId          = BAGL_FONT_OPEN_SANS_REGULAR_11px_1bpp;
-    textArea->obj.area.width  = AVAILABLE_WIDTH;
-    textArea->obj.area.height = 2 * nbgl_getFontLineHeight(textArea->fontId);
-    textArea->wrapping        = true;
-    nbLines = nbgl_getTextNbLinesInWidth(textArea->fontId, textArea->text, AVAILABLE_WIDTH, true);
-    // if more than 2 lines on screen
-    if (nbLines > 2) {
-        // TODO: warning for screenshots
-        return -1;
+    if (switchLayout->subText != NULL) {
+        // add switch description
+        textArea                = (nbgl_text_area_t *) nbgl_objPoolGet(TEXT_AREA, layoutInt->layer);
+        textArea->textColor     = WHITE;
+        textArea->text          = PIC(switchLayout->subText);
+        textArea->textAlignment = CENTER;
+        textArea->fontId        = BAGL_FONT_OPEN_SANS_REGULAR_11px_1bpp;
+        textArea->obj.area.width  = AVAILABLE_WIDTH;
+        textArea->obj.area.height = 2 * nbgl_getFontLineHeight(textArea->fontId);
+        textArea->wrapping        = true;
+        nbLines
+            = nbgl_getTextNbLinesInWidth(textArea->fontId, textArea->text, AVAILABLE_WIDTH, true);
+        // if more than 2 lines on screen
+        if (nbLines > 2) {
+            // TODO: warning for screenshots
+            return -1;
+        }
+        textArea->obj.alignment        = CENTER;
+        textArea->obj.alignmentMarginY = 1;  // not exactly centered
+        layoutAddObject(layoutInt, (nbgl_obj_t *) textArea);
     }
-    textArea->obj.alignment        = CENTER;
-    textArea->obj.alignmentMarginY = 1;  // not exactly centered
-    layoutAddObject(layoutInt, (nbgl_obj_t *) textArea);
 
     button = (nbgl_button_t *) nbgl_objPoolGet(BUTTON, ((nbgl_layoutInternal_t *) layout)->layer);
     button->foregroundColor = BLACK;