init Files

libraries/lvgl/examples/widgets/obj/index.rst

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+
+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
+

libraries/lvgl/examples/widgets/obj/lv_example_obj_1.c

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+#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

libraries/lvgl/examples/widgets/obj/lv_example_obj_2.c

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+#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(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