1 /* window.h -- Structure and flags used in manipulating Info windows.
2 $Id: window.h,v 1.12 2008/09/13 10:02:01 gray Exp $
4 This file is part of GNU Info, a program for reading online documentation
7 Copyright (C) 1993, 1997, 2004, 2007 Free Software Foundation, Inc.
9 This program is free software: you can redistribute it and/or modify
10 it under the terms of the GNU General Public License as published by
11 the Free Software Foundation, either version 3 of the License, or
12 (at your option) any later version.
14 This program is distributed in the hope that it will be useful,
15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 GNU General Public License for more details.
19 You should have received a copy of the GNU General Public License
20 along with this program. If not, see <http://www.gnu.org/licenses/>.
22 Written by Brian Fox (bfox@ai.mit.edu). */
30 /* Smallest number of visible lines in a window. The actual height is
31 always one more than this number because each window has a modeline. */
32 #define WINDOW_MIN_HEIGHT 2
34 /* Smallest number of screen lines that can be used to fully present a
35 window. This number includes the modeline of the window. */
36 #define WINDOW_MIN_SIZE (WINDOW_MIN_HEIGHT + 1)
38 /* A line map structure keeps a table of point values corresponding to
39 column offsets within the current line. It is used to convert
40 point values into columns on screen and vice versa. */
41 typedef struct line_map_struct
43 NODE *node; /* Node to which this line pertains */
44 size_t nline; /* Line number for which the map is computed. */
45 size_t size; /* Number of elements map can accomodate */
46 size_t used; /* Number of used map slots */
47 long *map; /* The map itself */
50 /* The exact same elements are used within the WINDOW_STATE structure and a
51 subsection of the WINDOW structure. We could define a structure which
52 contains this elements, and include that structure in each of WINDOW_STATE
53 and WINDOW. But that would lead references in the code such as
54 window->state->node which we would like to avoid. Instead, we #define the
55 elements here, and simply include the define in both data structures. Thus,
56 if you need to change window state information, here is where you would
57 do it. NB> The last element does NOT end with a semi-colon. */
58 #define WINDOW_STATE_DECL \
59 NODE *node; /* The node displayed in this window. */ \
60 int pagetop; /* LINE_STARTS[PAGETOP] is first line in WINDOW. */ \
61 long point /* Offset within NODE of the cursor position. */
63 /* Structure which defines a window. Windows are doubly linked, next
64 and prev. The list of windows is kept on WINDOWS. The structure member
65 window->height is the total height of the window. The position location
66 (0, window->height + window->first_row) is the first character of this
67 windows modeline. The number of lines that can be displayed in a window
68 is equal to window->height - 1. */
69 typedef struct window_struct
71 struct window_struct *next; /* Next window in this chain. */
72 struct window_struct *prev; /* Previous window in this chain. */
73 int width; /* Width of this window. */
74 int height; /* Height of this window. */
75 int first_row; /* Offset of the first line in the_screen. */
76 int goal_column; /* The column we would like the cursor to appear in. */
77 Keymap keymap; /* Keymap used to read commands in this window. */
78 WINDOW_STATE_DECL; /* Node, pagetop and point. */
79 LINE_MAP line_map; /* Current line map */
80 char *modeline; /* Calculated text of the modeline for this window. */
81 char **line_starts; /* Array of printed line starts for this node. */
82 int line_count; /* Number of lines appearing in LINE_STARTS. */
83 int flags; /* See below for details. */
87 WINDOW_STATE_DECL; /* What gets saved. */
90 /* Structure defining the current state of an incremental search. */
92 WINDOW_STATE_DECL; /* The node, pagetop and point. */
93 int search_index; /* Offset of the last char in the search string. */
94 int direction; /* The direction that this search is heading in. */
95 int failing; /* Whether or not this search failed. */
98 #define W_UpdateWindow 0x01 /* WINDOW needs updating. */
99 #define W_WindowIsPerm 0x02 /* This WINDOW is a permanent object. */
100 #define W_WindowVisible 0x04 /* This WINDOW is currently visible. */
101 #define W_InhibitMode 0x08 /* This WINDOW has no modeline. */
102 #define W_NoWrap 0x10 /* Lines do not wrap in this window. */
103 #define W_InputWindow 0x20 /* Window accepts input. */
104 #define W_TempWindow 0x40 /* Window is less important. */
106 extern WINDOW *windows; /* List of visible Info windows. */
107 extern WINDOW *active_window; /* The currently active window. */
108 extern WINDOW *the_screen; /* The Info screen is just another window. */
109 extern WINDOW *the_echo_area; /* THE_ECHO_AREA is a window in THE_SCREEN. */
111 extern int show_malformed_multibyte_p; /* Show malformed multibyte sequences */
113 /* Global variable control redisplay of scrolled windows. If non-zero, it
114 is the desired number of lines to scroll the window in order to make
115 point visible. A user might set this to 1 for smooth scrolling. If
116 set to zero, the line containing point is centered within the window. */
117 extern int window_scroll_step;
119 /* Make the modeline member for WINDOW. */
120 extern void window_make_modeline (WINDOW *window);
122 /* Initalize the window system by creating THE_SCREEN and THE_ECHO_AREA.
123 Create the first window ever, and make it permanent.
124 You pass WIDTH and HEIGHT; the dimensions of the total screen size. */
125 extern void window_initialize_windows (int width, int height);
127 /* Make a new window showing NODE, and return that window structure.
128 The new window is made to be the active window. If NODE is passed
129 as NULL, then show the node showing in the active window. If the
130 window could not be made return a NULL pointer. The active window
132 extern WINDOW *window_make_window (NODE *node);
134 /* Delete WINDOW from the list of known windows. If this window was the
135 active window, make the next window in the chain be the active window,
136 or the previous window in the chain if there is no next window. */
137 extern void window_delete_window (WINDOW *window);
139 /* A function to call when the screen changes size, and some windows have
140 to get deleted. The function is called with the window to be deleted
141 as an argument, and it can't do anything about the window getting deleted;
142 it can only clean up dangling references to that window. */
143 extern VFunction *window_deletion_notifier;
145 /* Set WINDOW to display NODE. */
146 extern void window_set_node_of_window (WINDOW *window, NODE *node);
148 /* Tell the window system that the size of the screen has changed. This
149 causes lots of interesting things to happen. The permanent windows
150 are resized, as well as every visible window. You pass WIDTH and HEIGHT;
151 the dimensions of the total screen size. */
152 extern void window_new_screen_size (int width, int height);
154 /* Change the height of WINDOW by AMOUNT. This also automagically adjusts
155 the previous and next windows in the chain. If there is only one user
156 window, then no change takes place. */
157 extern void window_change_window_height (WINDOW *window, int amount);
159 /* Adjust the pagetop of WINDOW such that the cursor point will be visible. */
160 extern void window_adjust_pagetop (WINDOW *window);
162 /* Tile all of the windows currently displayed in the global variable
163 WINDOWS. If argument DO_INTERNALS is non-zero, tile windows displaying
164 internal nodes as well. */
165 #define DONT_TILE_INTERNALS 0
166 #define TILE_INTERNALS 1
167 extern void window_tile_windows (int style);
169 /* Toggle the state of line wrapping in WINDOW. This can do a bit of fancy
171 extern void window_toggle_wrap (WINDOW *window);
173 /* For every window in CHAIN, set the flags member to have FLAG set. */
174 extern void window_mark_chain (WINDOW *chain, int flag);
176 /* For every window in CHAIN, clear the flags member of FLAG. */
177 extern void window_unmark_chain (WINDOW *chain, int flag);
179 /* Make WINDOW start displaying at PERCENT percentage of its node. */
180 extern void window_goto_percentage (WINDOW *window, int percent);
182 /* Build a new node which has FORMAT printed with ARG1 and ARG2 as the
184 extern NODE *build_message_node (const char *format, void *arg1, void *arg2);
186 /* Useful functions can be called from outside of window.c. */
187 extern void initialize_message_buffer (void);
189 /* Print FORMAT with ARG1,2 to the end of the current message buffer. */
190 extern void printf_to_message_buffer (const char *format, void *arg1, void *arg2,
193 /* Convert the contents of the message buffer to a node. */
194 extern NODE *message_buffer_to_node (void);
196 /* Return the length of the most recently printed line in message buffer. */
197 extern int message_buffer_length_this_line (void);
199 /* Pad STRING to COUNT characters by inserting blanks. */
200 extern int pad_to (int count, char *string);
202 /* Make a message appear in the echo area, built from FORMAT, ARG1 and ARG2.
203 The arguments are treated similar to printf () arguments, but not all of
204 printf () hair is present. The message appears immediately. If there was
205 already a message appearing in the echo area, it is removed. */
206 extern void window_message_in_echo_area (const char *format, void *arg1, void *arg2);
208 /* Place a temporary message in the echo area built from FORMAT, ARG1
209 and ARG2. The message appears immediately, but does not destroy
210 any existing message. A future call to unmessage_in_echo_area ()
211 restores the old contents. */
212 extern void message_in_echo_area (const char *format, void *arg1, void *arg2);
213 extern void unmessage_in_echo_area (void);
215 /* Clear the echo area, removing any message that is already present.
216 The echo area is cleared immediately. */
217 extern void window_clear_echo_area (void);
219 /* Quickly guess the approximate number of lines to that NODE would
220 take to display. This really only counts carriage returns. */
221 extern int window_physical_lines (NODE *node);
223 /* Calculate a list of line starts for the node belonging to WINDOW. The line
224 starts are pointers to the actual text within WINDOW->NODE. */
225 extern void calculate_line_starts (WINDOW *window);
227 /* Given WINDOW, recalculate the line starts for the node it displays. */
228 extern void recalculate_line_starts (WINDOW *window);
230 /* Return the number of characters it takes to display CHARACTER on the
232 extern int character_width (int character, int hpos);
234 /* Return the number of characters it takes to display STRING on the
236 extern int string_width (char *string, int hpos);
238 /* Return the index of the line containing point. */
239 extern int window_line_of_point (WINDOW *window);
241 /* Get and return the goal column for this window. */
242 extern int window_get_goal_column (WINDOW *window);
244 /* Get and return the printed column offset of the cursor in this window. */
245 extern int window_get_cursor_column (WINDOW *window);
247 /* Get and Set the node, pagetop, and point of WINDOW. */
248 extern void window_get_state (WINDOW *window, SEARCH_STATE *state);
249 extern void window_set_state (WINDOW *window, SEARCH_STATE *state);
251 /* Count the number of characters in current line of WIN that precede
252 the printed column offset of GOAL. */
253 extern int window_chars_to_goal (WINDOW *win, int goal);
255 extern size_t process_node_text
256 (WINDOW *win, char *start, int do_tags,
257 int (*fun) (void *, size_t, const char *, char *, size_t, size_t),
260 void clean_manpage (char *manpage);
262 extern void window_compute_line_map (WINDOW *win);
264 int window_point_to_column (WINDOW *win, long point, long *np);
266 void window_line_map_init (WINDOW *win);
268 long window_end_of_line (WINDOW *win);
270 #endif /* not INFO_WINDOW_H */