add some code

managed_components/lvgl__lvgl/examples/widgets/obj/index.rst

@@ -0,0 +1,18 @@
+
+Base objects with custom styles
+-------------------------------
+
+.. lv_example:: widgets/obj/lv_example_obj_1
+  :language: c
+
+Make an object draggable
+------------------------
+
+.. lv_example:: widgets/obj/lv_example_obj_2
+  :language: c
+
+Transform object using a 3x3 matrix
+-----------------------------------
+
+.. lv_example:: widgets/obj/lv_example_obj_3
+  :language: c

managed_components/lvgl__lvgl/examples/widgets/obj/lv_example_obj_1.c

@@ -0,0 +1,22 @@
+#include "../../lv_examples.h"
+#if LV_BUILD_EXAMPLES
+
+void lv_example_obj_1(void)
+{
+    lv_obj_t * obj1;
+    obj1 = lv_obj_create(lv_screen_active());
+    lv_obj_set_size(obj1, 100, 50);
+    lv_obj_align(obj1, LV_ALIGN_CENTER, -60, -30);
+
+    static lv_style_t style_shadow;
+    lv_style_init(&style_shadow);
+    lv_style_set_shadow_width(&style_shadow, 10);
+    lv_style_set_shadow_spread(&style_shadow, 5);
+    lv_style_set_shadow_color(&style_shadow, lv_palette_main(LV_PALETTE_BLUE));
+
+    lv_obj_t * obj2;
+    obj2 = lv_obj_create(lv_screen_active());
+    lv_obj_add_style(obj2, &style_shadow, 0);
+    lv_obj_align(obj2, LV_ALIGN_CENTER, 60, 30);
+}
+#endif

managed_components/lvgl__lvgl/examples/widgets/obj/lv_example_obj_2.c

@@ -0,0 +1,34 @@
+#include "../../lv_examples.h"
+#if LV_BUILD_EXAMPLES
+
+static void drag_event_handler(lv_event_t * e)
+{
+    lv_obj_t * obj = lv_event_get_target_obj(e);
+
+    lv_indev_t * indev = lv_indev_active();
+    if(indev == NULL)  return;
+
+    lv_point_t vect;
+    lv_indev_get_vect(indev, &vect);
+
+    int32_t x = lv_obj_get_x_aligned(obj) + vect.x;
+    int32_t y = lv_obj_get_y_aligned(obj) + vect.y;
+    lv_obj_set_pos(obj, x, y);
+}
+
+/**
+ * Make an object draggable.
+ */
+void lv_example_obj_2(void)
+{
+    lv_obj_t * obj;
+    obj = lv_obj_create(lv_screen_active());
+    lv_obj_set_size(obj, 150, 100);
+    lv_obj_add_event_cb(obj, drag_event_handler, LV_EVENT_PRESSING, NULL);
+
+    lv_obj_t * label = lv_label_create(obj);
+    lv_label_set_text(label, "Drag me");
+    lv_obj_center(label);
+
+}
+#endif

managed_components/lvgl__lvgl/examples/widgets/obj/lv_example_obj_3.c

@@ -0,0 +1,42 @@
+#include "../../lv_examples.h"
+#if LV_BUILD_EXAMPLES
+#if LV_DRAW_TRANSFORM_USE_MATRIX
+
+static void timer_cb(lv_timer_t * timer)
+{
+    lv_obj_t * obj = (lv_obj_t *) lv_timer_get_user_data(timer);
+
+    static float value = 0.1f;
+    lv_matrix_t matrix;
+    lv_matrix_identity(&matrix);
+    lv_matrix_scale(&matrix, value, 1);
+    lv_matrix_rotate(&matrix, value * 360);
+    lv_obj_set_transform(obj, &matrix);
+
+    value += 0.01f;
+
+    if(value > 2.0f) {
+        lv_obj_reset_transform(obj);
+        value = 0.1f;
+    }
+}
+
+void lv_example_obj_3(void)
+{
+    lv_obj_t * obj = lv_obj_create(lv_screen_active());
+    lv_obj_center(obj);
+
+    lv_timer_create(timer_cb, 20, obj);
+}
+
+#else
+
+void lv_example_obj_3(void)
+{
+    lv_obj_t * label = lv_label_create(lv_screen_active());
+    lv_label_set_text_static(label, "LV_DRAW_TRANSFORM_USE_MATRIX is not enabled");
+    lv_obj_center(label);
+}
+
+#endif /*LV_DRAW_TRANSFORM_USE_MATRIX*/
+#endif /*LV_BUILD_EXAMPLES*/