add the prototypes of the examples

examples/widgets/btnmatrix/lv_example_btnmatrix_2.c

@@ -2,7 +2,7 @@
 #if LV_USE_BTNMATRIX && LV_BUILD_EXAMPLES
 
 
-void event_cb(lv_obj_t * obj, lv_event_t e)
+static void event_cb(lv_obj_t * obj, lv_event_t e)
 {
     if(e == LV_EVENT_DRAW_PART_BEGIN) {
         lv_obj_draw_hook_dsc_t * dsc = lv_event_get_param();

examples/widgets/img/lv_example_img_1.c

@@ -1,11 +1,10 @@
 #include "../../../lvgl.h"
 #if LV_USE_IMG && LV_BUILD_EXAMPLES
 
-/* Find the image here: https://github.com/lvgl/lv_examples/tree/master/assets */
-LV_IMG_DECLARE(img_cogwheel_argb);
 
 void lv_example_img_1(void)
 {
+    LV_IMG_DECLARE(img_cogwheel_argb);
     lv_obj_t * img1 = lv_img_create(lv_scr_act(), NULL);
     lv_img_set_src(img1, &img_cogwheel_argb);
     lv_obj_align(img1, NULL, LV_ALIGN_CENTER, 0, -20);

examples/widgets/img/lv_example_img_2.c

@@ -30,7 +30,7 @@ void lv_example_img_2(void)
     lv_obj_align(intense_slider, blue_slider, LV_ALIGN_OUT_RIGHT_MID, 25, 0);
 
     /* Now create the actual image */
-    LV_IMG_DECLARE(img_cogwheel_argb);
+    LV_IMG_DECLARE(img_cogwheel_argb)
     img1 = lv_img_create(lv_scr_act(), NULL);
     lv_img_set_src(img1, &img_cogwheel_argb);
     lv_obj_align(img1, NULL, LV_ALIGN_IN_RIGHT_MID, -20, 0);

examples/widgets/img/lv_example_img_3.c

@@ -1,13 +1,14 @@
 #include "../../../lvgl.h"
 #if LV_USE_IMG && LV_BUILD_EXAMPLES
 
-LV_IMG_DECLARE(img_cogwheel_argb);
 
 /**
  * Show transformations (zoom and rotation) using a pivot point.
  */
 void lv_example_img_3(void)
 {
+    LV_IMG_DECLARE(img_cogwheel_argb);
+
     /* Now create the actual image */
     lv_obj_t * img = lv_img_create(lv_scr_act(), NULL);
     lv_img_set_src(img, &img_cogwheel_argb);

examples/widgets/img/lv_example_img_4.c

@@ -1,13 +1,13 @@
 #include "../../../lvgl.h"
 #if LV_USE_IMG && LV_BUILD_EXAMPLES
 
-LV_IMG_DECLARE(img_skew_strip);
-
 /**
  * Image styling and offset
  */
 void lv_example_img_4(void)
 {
+    LV_IMG_DECLARE(img_skew_strip);
+
     static lv_style_t style;
     lv_style_init(&style);
     lv_style_set_bg_color(&style, LV_COLOR_YELLOW);

examples/widgets/keyboard/lv_example_keyboard_1.c

@@ -15,7 +15,7 @@ static void ta_event_cb(lv_obj_t * ta, lv_event_t e)
     }
 }
 
-void lv_keyboard_example_1(void)
+void lv_example_keyboard_1(void)
 {
     /*Create a keyboard to use it with an of the text areas*/
     lv_obj_t *kb = lv_keyboard_create(lv_scr_act());

examples/widgets/list/lv_example_list_1.c

@@ -7,7 +7,7 @@ static void event_handler(lv_obj_t * obj, lv_event_t event)
         LV_LOG_USER("Clicked: %s\n", lv_list_get_btn_text(obj));
     }
 }
-void lv_list_example_1(void)
+void lv_example_list_1(void)
 {
     /*Create a list*/
     lv_obj_t * list1 = lv_list_create(lv_scr_act());

examples/widgets/lv_example_widgets.h

@@ -27,45 +27,92 @@ extern "C" {
  **********************/
 void lv_example_arc_1(void);
 void lv_example_arc_2(void);
+
 void lv_example_bar_1(void);
+void lv_example_bar_2(void);
+void lv_example_bar_3(void);
+void lv_example_bar_4(void);
+void lv_example_bar_5(void);
+void lv_example_bar_6(void);
+
 void lv_example_btn_1(void);
 void lv_example_btn_2(void);
+void lv_example_btn_3(void);
+
 void lv_example_btnmatrix_1(void);
+void lv_example_btnmatrix_2(void);
+void lv_example_btnmatrix_3(void);
+
 void lv_example_calendar_1(void);
+
 void lv_example_canvas_1(void);
 void lv_example_canvas_2(void);
-void lv_example_checkbox_1(void);
+
 void lv_example_chart_1(void);
 void lv_example_chart_2(void);
+void lv_example_chart_3(void);
+void lv_example_chart_4(void);
+
+void lv_example_checkbox_1(void);
+
+void lv_example_colorwheel_1(void);
+
 void lv_example_dropdown_1(void);
 void lv_example_dropdown_2(void);
-void lv_example_gauge_1(void);
-void lv_example_gauge_2(void);  
+void lv_example_dropdown_3(void);
+
 void lv_example_img_1(void);
 void lv_example_img_2(void);
 void lv_example_img_3(void);
+void lv_example_img_4(void);
+
 void lv_example_imgbtn_1(void);
+
 void lv_example_keyboard_1(void);
+
 void lv_example_label_1(void);
 void lv_example_label_2(void);
-void lv_example_label_3(void);
+
 void lv_example_led_1(void);
+
 void lv_example_line_1(void);
+
 void lv_example_list_1(void);
-void lv_example_linemeter_1(void);
+
+void lv_example_meter_1(void);
+void lv_example_meter_2(void);
+void lv_example_meter_3(void);
+void lv_example_meter_4(void);
+
 void lv_example_msgbox_1(void);
-void lv_example_msgbox_2(void);
+
 void lv_example_obj_1(void);
-void lv_example_spinner_1(void);
+
 void lv_example_roller_1(void);
+void lv_example_roller_2(void);
+
 void lv_example_slider_1(void);
 void lv_example_slider_2(void);
+void lv_example_slider_3(void);
+
+void lv_example_spinbox_1(void);
+
+void lv_example_spinner_1(void);
+
 void lv_example_switch_1(void);
-void lv_example_textarea_1(void);
-void lv_example_objmask_1(void);
-void lv_example_objmask_2(void);
+
 void lv_example_table_1(void);
 
+void lv_example_tabview_1(void);
+
+void lv_example_textarea_1(void);
+void lv_example_textarea_2(void);
+void lv_example_textarea_3(void);
+
+void lv_example_tileview_1(void);
+
+void lv_example_win_1(void);
+
 /**********************
  *      MACROS
  **********************/

examples/widgets/roller/lv_example_roller_2.c

@@ -1,5 +1,5 @@
 #include "../../../lvgl.h"
-#if LV_USE_ROLLER && LV_BUILD_EXAMPLES
+#if LV_USE_ROLLER && LV_FONT_MONTSERRAT_22 && LV_BUILD_EXAMPLES
 
 static void event_handler(lv_obj_t * obj, lv_event_t event)
 {