From 6971d603d2da561afd49c7d02665ecf8d4280497 Mon Sep 17 00:00:00 2001
From: Gabor Kiss-Vamosi <kisvegabor@gmail.com>
Date: Sat, 27 Jun 2020 06:53:19 +0200
Subject: [PATCH] add lv_theme_copy

---
 src/lv_themes/lv_theme.c | 30 +++++++++++++++++++++++++++---
 src/lv_themes/lv_theme.h | 19 ++++++++++++++++---
 2 files changed, 43 insertions(+), 6 deletions(-)

diff --git a/src/lv_themes/lv_theme.c b/src/lv_themes/lv_theme.c
index 276e21d12..365fe3aa4 100644
--- a/src/lv_themes/lv_theme.c
+++ b/src/lv_themes/lv_theme.c
@@ -69,6 +69,30 @@ void lv_theme_apply(lv_obj_t * obj, lv_theme_style_t name)
     apply_theme(act_theme, obj, name);
 }
 
+/**
+ * Copy a theme to an other or initialize a theme
+ * @param theme pointer to a theme to initialize
+ * @param copy pointer to a theme to copy
+ *             or `NULL` to initialize `theme` to empty
+ */
+void lv_theme_copy(lv_theme_t * theme, const lv_theme_t * copy)
+{
+    _lv_memset_00(theme, sizeof(lv_theme_t));
+
+    if(copy) {
+        theme->font_small = copy->font_small;
+        theme->font_normal = copy->font_normal;
+        theme->font_subtitle = copy->font_subtitle;
+        theme->font_title = copy->font_title;
+        theme->color_primary = copy->color_primary;
+        theme->color_secondary = copy->color_secondary;
+        theme->flags = copy->flags;
+        theme->base = copy->base;
+        theme->apply_cb = copy->apply_cb;
+        theme->apply_xcb = copy->apply_xcb;
+    }
+
+}
 
 /**
  * Set a base theme for a theme.
@@ -79,7 +103,7 @@ void lv_theme_apply(lv_obj_t * obj, lv_theme_style_t name)
  */
 void lv_theme_set_base(lv_theme_t * new, lv_theme_t * base)
 {
-    new->base_theme = base;
+    new->base = base;
 }
 
 /**
@@ -151,8 +175,8 @@ uint32_t lv_theme_get_flags(void)
 
 static void apply_theme(lv_theme_t * th, lv_obj_t * obj, lv_theme_style_t name)
 {
-    if(th->base_theme) {
-        apply_theme(th->base_theme, obj, name);
+    if(th->base) {
+        apply_theme(th->base, obj, name);
     }
 
     /*apply_xcb is deprecated, use apply_cb instead*/
diff --git a/src/lv_themes/lv_theme.h b/src/lv_themes/lv_theme.h
index 9941d2c99..0a24f5e7d 100644
--- a/src/lv_themes/lv_theme.h
+++ b/src/lv_themes/lv_theme.h
@@ -146,10 +146,15 @@ typedef enum {
 
 } lv_theme_style_t;
 
+struct _lv_theme_t;
+
+typedef void (*lv_theme_apply_cb_t)(struct _lv_theme_t *, lv_obj_t *, lv_theme_style_t);
+typedef void (*lv_theme_apply_xcb_t)(lv_obj_t *, lv_theme_style_t); /*Deprecated: use `apply_cb` instead*/
+
 typedef struct _lv_theme_t {
-    void (*apply_xcb)(lv_obj_t *, lv_theme_style_t); /*Deprecated: use `apply_cb` instead*/
-    void (*apply_cb)(struct _lv_theme_t *, lv_obj_t *, lv_theme_style_t);
-    struct _lv_theme_t * base_theme;    /**< Apply the current theme's style on top of this theme.*/
+    lv_theme_apply_cb_t apply_cb;
+    lv_theme_apply_xcb_t apply_xcb; /*Deprecated: use `apply_cb` instead*/
+    struct _lv_theme_t * base;    /**< Apply the current theme's style on top of this theme.*/
     lv_color_t color_primary;
     lv_color_t color_secondary;
     const lv_font_t * font_small;
@@ -184,6 +189,14 @@ lv_theme_t * lv_theme_get_act(void);
  */
 void lv_theme_apply(lv_obj_t * obj, lv_theme_style_t name);
 
+/**
+ * Copy a theme to an other or initialize a theme
+ * @param theme pointer to a theme to initialize
+ * @param copy pointer to a theme to copy
+ *             or `NULL` to initialize `theme` to empty
+ */
+void lv_theme_copy(lv_theme_t * theme, const lv_theme_t * copy);
+
 /**
  * Set a base theme for a theme.
  * The styles from the base them will be added before the styles of the current theme.