FL-819 new first start screen, add multiline text (#318)

* GUI Canvas: get current font height routine
* Dolphin: new start screen. GUI: new multiline element.
* Dolphin: up state version to reset it for everyone
* Dolphin: take maximum of idle screen height
* Dolphin: frames on first start screen.

applications/gui/elements.c

@@ -1,6 +1,14 @@
 #include "elements.h"
+#include "canvas_i.h"
+
+#include <furi.h>
+
+#include <string.h>
+#include <m-string.h>
 
 void elements_scrollbar(Canvas* canvas, uint8_t pos, uint8_t total) {
+    furi_assert(canvas);
+
     uint8_t width = canvas_width(canvas);
     uint8_t height = canvas_height(canvas);
     // prevent overflows
@@ -19,6 +27,8 @@ void elements_scrollbar(Canvas* canvas, uint8_t pos, uint8_t total) {
 }
 
 void elements_frame(Canvas* canvas, uint8_t x, uint8_t y, uint8_t width, uint8_t height) {
+    furi_assert(canvas);
+
     canvas_draw_line(canvas, x + 2, y, x + width - 2, y);
     canvas_draw_line(canvas, x + 1, y + height - 1, x + width, y + height - 1);
     canvas_draw_line(canvas, x + 2, y + height, x + width - 1, y + height);
@@ -28,4 +38,27 @@ void elements_frame(Canvas* canvas, uint8_t x, uint8_t y, uint8_t width, uint8_t
     canvas_draw_line(canvas, x + width, y + 2, x + width, y + height - 2);
 
     canvas_draw_dot(canvas, x + 1, y + 1);
-}
+}
+
+void elements_multiline_text(Canvas* canvas, uint8_t x, uint8_t y, char* text) {
+    furi_assert(canvas);
+    furi_assert(text);
+
+    uint8_t font_height = canvas_current_font_height(canvas);
+    string_t str;
+    string_init(str);
+    char* start = text;
+    char* end;
+    do {
+        end = strchr(start, '\n');
+        if(end) {
+            string_set_strn(str, start, end - start);
+        } else {
+            string_set_str(str, start);
+        }
+        canvas_draw_str(canvas, x, y, string_get_cstr(str));
+        start = end + 1;
+        y += font_height;
+    } while(end);
+    string_clear(str);
+}