feat(example) add style examples

examples/styles/lv_example_style_5.c

@@ -0,0 +1,29 @@
+#include "../lv_examples.h"
+#if LV_BUILD_EXAMPLES
+
+/**
+ * Using the Shadow style properties
+ */
+void lv_example_style_5(void)
+{
+    static lv_style_t style;
+    lv_style_init(&style);
+
+    /*Set a background color and a radius*/
+    lv_style_set_radius(&style, 5);
+    lv_style_set_bg_opa(&style, LV_OPA_COVER);
+    lv_style_set_bg_color(&style, lv_palette_lighten(LV_PALETTE_GREY, 1));
+
+    /*Add a shadow*/
+    lv_style_set_shadow_width(&style, 25);
+    lv_style_set_shadow_color(&style, lv_palette_main(LV_PALETTE_BLUE));
+    lv_style_set_shadow_ofs_x(&style, 10);
+    lv_style_set_shadow_ofs_y(&style, 20);
+
+    /*Create an object with the new style*/
+    lv_obj_t * obj = lv_obj_create(lv_scr_act());
+    lv_obj_add_style(obj, &style, 0);
+    lv_obj_center(obj);
+}
+
+#endif