1 /* GTK - The GIMP Toolkit
2  * Copyright (C) 1995-1997 Peter Mattis, Spencer Kimball and Josh MacDonald
3  *
4  * This library is free software; you can redistribute it and/or
5  * modify it under the terms of the GNU Lesser General Public
6  * License as published by the Free Software Foundation; either
7  * version 2 of the License, or (at your option) any later version.
8  *
9  * This library is distributed in the hope that it will be useful,
10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
12  * Lesser General Public License for more details.
13  *
14  * You should have received a copy of the GNU Lesser General Public
15  * License along with this library. If not, see <http://www.gnu.org/licenses/>.
16  */
17 
18 /*
19  * Modified by the GTK+ Team and others 1997-2000.  See the AUTHORS
20  * file for a list of people on the GTK+ Team.  See the ChangeLog
21  * files for a list of changes.  These files are distributed with
22  * GTK+ at ftp://ftp.gtk.org/pub/gtk/.
23  */
24 
25 #ifndef __GTK_SIZE_REQUEST_CACHE_PRIVATE_H__
26 #define __GTK_SIZE_REQUEST_CACHE_PRIVATE_H__
27 
28 #include <glib.h>
29 #include <gtk/gtkenums.h>
30 
31 G_BEGIN_DECLS
32 
33 /* Cache as many ranges of height-for-width
34  * (or width-for-height) as can be rational
35  * for a said widget to have, if a label can
36  * only wrap to 3 lines, only 3 caches will
37  * ever be allocated for it.
38  */
39 #define GTK_SIZE_REQUEST_CACHED_SIZES   (5)
40 
41 typedef struct {
42   gint minimum_size;
43   gint natural_size;
44 } CachedSizeX;
45 
46 typedef struct {
47   gint minimum_size;
48   gint natural_size;
49   gint minimum_baseline;
50   gint natural_baseline;
51 } CachedSizeY;
52 
53 typedef struct
54 {
55   gint       lower_for_size; /* The minimum for_size with the same result */
56   gint       upper_for_size; /* The maximum for_size with the same result */
57   CachedSizeX cached_size;
58 } SizeRequestX;
59 
60 typedef struct
61 {
62   gint       lower_for_size; /* The minimum for_size with the same result */
63   gint       upper_for_size; /* The maximum for_size with the same result */
64   CachedSizeY cached_size;
65 } SizeRequestY;
66 
67 typedef struct {
68   SizeRequestX **requests_x;
69   SizeRequestY **requests_y;
70 
71   CachedSizeX  cached_size_x;
72   CachedSizeY  cached_size_y;
73 
74   GtkSizeRequestMode request_mode   : 3;
75   guint       request_mode_valid    : 1;
76   struct {
77     guint       n_cached_requests   : 3;
78     guint       last_cached_request : 3;
79     guint       cached_size_valid   : 1;
80   }           flags[2];
81 } SizeRequestCache;
82 
83 void            _gtk_size_request_cache_init                    (SizeRequestCache       *cache);
84 void            _gtk_size_request_cache_free                    (SizeRequestCache       *cache);
85 
86 void            _gtk_size_request_cache_clear                   (SizeRequestCache       *cache);
87 void            _gtk_size_request_cache_commit                  (SizeRequestCache       *cache,
88                                                                  GtkOrientation          orientation,
89                                                                  gint                    for_size,
90                                                                  gint                    minimum_size,
91                                                                  gint                    natural_size,
92                                                                  gint                    minimum_baseline,
93                                                                  gint                    natural_baseline);
94 gboolean        _gtk_size_request_cache_lookup                  (SizeRequestCache       *cache,
95                                                                  GtkOrientation          orientation,
96                                                                  gint                    for_size,
97                                                                  gint                   *minimum,
98                                                                  gint                   *natural,
99                                                                  gint                   *minimum_baseline,
100                                                                  gint                   *natural_baseline);
101 
102 G_END_DECLS
103 
104 #endif /* __GTK_SIZE_REQUEST_CACHE_PRIVATE_H__ */
105