fix(example) add scroll examples + minor fixes

docs/overview/scroll.md

@@ -161,3 +161,9 @@ if(event_code == LV_EVENT_GET_SELF_SIZE) {
 ```
 
 ## Examples
+
+```eval_rst
+
+.. include:: ../../../examples/scroll/index.rst
+
+```

examples/scroll/index.rst

@@ -0,0 +1,23 @@
+C
+^
+
+Nested scrolling 
+""""""""""""""""
+
+.. lv_example:: scroll/lv_example_scroll_1
+  :language: c
+
+Snapping
+""""""""""""""""
+.. lv_example:: scroll/lv_example_scroll_2
+  :language: c
+
+Floating button
+""""""""""""""""
+.. lv_example:: scroll/lv_example_scroll_3
+  :language: c
+
+MicroPython
+^^^^^^^^^^^
+
+No examples yet.

examples/scroll/lv_example_scroll_1.c

@@ -16,30 +16,25 @@ void lv_example_scroll_1(void)
 
     child = lv_obj_create(panel);
     lv_obj_set_pos(child, 0, 0);
+    lv_obj_set_size(child, 70, 70);
     label = lv_label_create(child);
     lv_label_set_text(label, "Zero");
     lv_obj_center(label);
 
     child = lv_obj_create(panel);
-    lv_obj_set_pos(child, -40, 100);
-    label = lv_label_create(child);
-    lv_label_set_text(label, "Left");
-    lv_obj_center(label);
+    lv_obj_set_pos(child, 160, 80);
+    lv_obj_set_size(child, 80, 80);
 
-    child = lv_obj_create(panel);
-    lv_obj_set_pos(child, 90, -30);
-    label = lv_label_create(child);
-    lv_label_set_text(label, "Top");
-    lv_obj_center(label);
+    lv_obj_t * child2 = lv_btn_create(child);
+    lv_obj_set_size(child2, 100, 50);
 
-    child = lv_obj_create(panel);
-    lv_obj_set_pos(child, 150, 80);
-    label = lv_label_create(child);
+    label = lv_label_create(child2);
     lv_label_set_text(label, "Right");
     lv_obj_center(label);
 
     child = lv_obj_create(panel);
-    lv_obj_set_pos(child, 60, 170);
+    lv_obj_set_pos(child, 40, 160);
+    lv_obj_set_size(child, 100, 70);
     label = lv_label_create(child);
     lv_label_set_text(label, "Bottom");
     lv_obj_center(label);

examples/scroll/lv_example_scroll_2.c

@@ -20,15 +20,15 @@ static void sw_event_cb(lv_event_t * e)
 void lv_example_scroll_2(void)
 {
     lv_obj_t * panel = lv_obj_create(lv_scr_act());
-    lv_obj_set_size(panel, 280, 150);
+    lv_obj_set_size(panel, 280, 120);
     lv_obj_set_scroll_snap_x(panel, LV_SCROLL_SNAP_CENTER);
     lv_obj_set_flex_flow(panel, LV_FLEX_FLOW_ROW);
-    lv_obj_center(panel);
+    lv_obj_align(panel, LV_ALIGN_CENTER, 0, 20);
 
     uint32_t i;
     for(i = 0; i < 10; i++) {
         lv_obj_t * btn = lv_btn_create(panel);
-        lv_obj_set_size(btn, 150, 100);
+        lv_obj_set_size(btn, 150, lv_pct(100));
 
         lv_obj_t * label = lv_label_create(btn);
         if(i == 3) {

src/core/lv_obj_scroll.c

@@ -384,6 +384,7 @@ bool lv_obj_is_scrolling(const lv_obj_t * obj)
 
 void lv_obj_update_snap(lv_obj_t * obj, lv_anim_enable_t anim_en)
 {
+    lv_obj_update_layout(obj);
     lv_point_t p;
     lv_indev_scroll_get_snap_dist(obj, &p);
     lv_obj_scroll_by(obj, p.x, p.y, anim_en);