From 65a47e5685546d2810293f249d2fdd589239926f Mon Sep 17 00:00:00 2001
From: sabetts <sabetts>
Date: Fri, 23 Feb 2001 10:12:14 +0000
Subject: * main.c (main): passes return value of find_window_other() to
 set_active_window().

* list.h (remove_from_window_list): removed prototype
(find_window_in_list): new prototype
(append_to_list): likewise
(insert_into_list): likewise
(remove_from_list): likewise

* list.c: propogated use of rp_unmapped_window_sentinel and
rp_mapped_window_sentinel.
(find_window_in_list): new function
(find_window): calls find_window_in_list to search mapped and
unmapped window lists.
(remove_from_window_list): removed function
(init_window_list): initialized sentinels
(find_window_prev): searches only the mapped window list.
(find_window_next): likewise
(find_window_other): likewise
(append_to_list): new function
(insert_into_list): new function
(remove_from_list): new function

* events.c (unmap_notify): Searches only the mapped window
list. moves the window from the unmapped window list to the mapped
window list.

* data.h: removed rp_window_head and rp_window_tail, updated
dependant files.  Added rp_mapped_window_sentinel and
rp_unmapped_window_sentinel globals.

* bar.c (update_window_names): loops only through mapped window
list.
---
 src/data.h | 24 ++++++++++++++++++++++--
 1 file changed, 22 insertions(+), 2 deletions(-)

(limited to 'src/data.h')

diff --git a/src/data.h b/src/data.h
index 9ba8419..e79ab41 100644
--- a/src/data.h
+++ b/src/data.h
@@ -84,8 +84,28 @@ struct rp_action
 /*   void (*func)(void *); */
 };
 
-extern  rp_window *rp_window_head, *rp_window_tail;
-extern  rp_window *rp_current_window;
+/* These _sentinel pointers point to a special rp_window whose next
+   pointer points to the head of the list and whose prev pointer
+   points to the tail. This is done to simplify removing an element
+   from the list: since there are no head and tail global variable
+   pointers that need to be updated, functions that manipulate
+   elements in a list don't need to know what list they belong to. The
+   last element's next pointer points to the sentinel as does the
+   first element's prev pointer. An empty list is represented by the
+   sentinel's prev and next pointers pointing to itself. */
+
+/* A list of mapped windows. These windows show up in the window
+   list and have a number assigned to them. */
+extern rp_window *rp_mapped_window_sentinel;
+
+/* A list of unmapped windows. These windows do not have a number
+   assigned to them and are not visible/active. */
+extern rp_window *rp_unmapped_window_sentinel;
+
+/* Pointer to the currently focused window. Points to an element in
+   the mapped window list. NULL if there are no mapped windows. */
+extern rp_window *rp_current_window;
+
 extern screen_info *screens;
 extern int num_screens;
 
-- 
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