init Files

libraries/lvgl/examples/styles/lv_example_style_14.c

@@ -0,0 +1,62 @@
+#include "../../src/themes/lv_theme_private.h"
+#include "../lv_examples.h"
+#if LV_BUILD_EXAMPLES && LV_USE_IMAGE
+
+static lv_style_t style_btn;
+
+/*Will be called when the styles of the base theme are already added
+  to add new styles*/
+static void new_theme_apply_cb(lv_theme_t * th, lv_obj_t * obj)
+{
+    LV_UNUSED(th);
+
+    if(lv_obj_check_type(obj, &lv_button_class)) {
+        lv_obj_add_style(obj, &style_btn, 0);
+    }
+}
+
+static void new_theme_init_and_set(void)
+{
+    /*Initialize the styles*/
+    lv_style_init(&style_btn);
+    lv_style_set_bg_color(&style_btn, lv_palette_main(LV_PALETTE_GREEN));
+    lv_style_set_border_color(&style_btn, lv_palette_darken(LV_PALETTE_GREEN, 3));
+    lv_style_set_border_width(&style_btn, 3);
+
+    /*Initialize the new theme from the current theme*/
+    lv_theme_t * th_act = lv_display_get_theme(NULL);
+    static lv_theme_t th_new;
+    th_new = *th_act;
+
+    /*Set the parent theme and the style apply callback for the new theme*/
+    lv_theme_set_parent(&th_new, th_act);
+    lv_theme_set_apply_cb(&th_new, new_theme_apply_cb);
+
+    /*Assign the new theme to the current display*/
+    lv_display_set_theme(NULL, &th_new);
+}
+
+/**
+ * Extending the current theme
+ */
+void lv_example_style_14(void)
+{
+    lv_obj_t * btn;
+    lv_obj_t * label;
+
+    btn = lv_button_create(lv_screen_active());
+    lv_obj_align(btn, LV_ALIGN_TOP_MID, 0, 20);
+
+    label = lv_label_create(btn);
+    lv_label_set_text(label, "Original theme");
+
+    new_theme_init_and_set();
+
+    btn = lv_button_create(lv_screen_active());
+    lv_obj_align(btn, LV_ALIGN_BOTTOM_MID, 0, -20);
+
+    label = lv_label_create(btn);
+    lv_label_set_text(label, "New theme");
+}
+
+#endif