From 7587dfa17cdc643881a3048a0935abe2f31d2936 Mon Sep 17 00:00:00 2001
From: Lephenixnoir <sebastien.michelland@protonmail.com>
Date: Wed, 4 Sep 2024 08:51:41 +0200
Subject: [PATCH] jlist: add user data pointer

This allows the info and paint functions to access user data associated
with the list without going through globals.
---
 include/justui/jlist.h | 7 +++++--
 src/jlist.c            | 7 +++++--
 2 files changed, 10 insertions(+), 4 deletions(-)

diff --git a/include/justui/jlist.h b/include/justui/jlist.h
index cc395d7..27ffedd 100644
--- a/include/justui/jlist.h
+++ b/include/justui/jlist.h
@@ -77,6 +77,8 @@ typedef struct jlist {
 
     /* Currently selected item, -1 if none */
     int cursor;
+    /* User data pointer */
+    void *user;
 
 } jlist;
 
@@ -91,8 +93,9 @@ jlist *jlist_create(jlist_item_info_function info_function,
 
 /* jlist_update_model(): Update jlists's information about the model
    The new model size is passed as parameter. The model is refreshed by
-   repeatedly calling the info function. */
-void jlist_update_model(jlist *l, int item_count);
+   repeatedly calling the info function. The user pointer is also updated. To
+   keep it unchanged, pass `l->user` as third parameter. */
+void jlist_update_model(jlist *l, int item_count, void *user);
 
 /* jlist_clear(): Remove all items */
 void jlist_clear(jlist *l);
diff --git a/src/jlist.c b/src/jlist.c
index 93b65b8..c55705f 100644
--- a/src/jlist.c
+++ b/src/jlist.c
@@ -37,6 +37,7 @@ jlist *jlist_create(jlist_item_info_function info_function,
     l->info_function = info_function;
     l->paint_function = paint_function;
     l->cursor = -1;
+    l->user = NULL;
     return l;
 }
 
@@ -113,8 +114,10 @@ int jlist_selected_item(jlist *l)
 // Item management
 //---
 
-void jlist_update_model(jlist *l, int item_count)
+void jlist_update_model(jlist *l, int item_count, void *user)
 {
+    l->user = user;
+
     if(l->item_count != item_count) {
         l->items = realloc(l->items, item_count * sizeof *l->items);
         if(!l->items) {
@@ -138,7 +141,7 @@ void jlist_update_model(jlist *l, int item_count)
 
 void jlist_clear(jlist *l)
 {
-    jlist_update_model(l, 0);
+    jlist_update_model(l, 0, NULL);
 }
 
 jrect jlist_selected_region(jlist *l)