230 lines
9.7 KiB
C
230 lines
9.7 KiB
C
/* window.h -- Structure and flags used in manipulating Info windows. */
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/* This file is part of GNU Info, a program for reading online documentation
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stored in Info format.
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Copyright (C) 1993 Free Software Foundation, Inc.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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Written by Brian Fox (bfox@ai.mit.edu). */
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#ifndef _WINDOW_H_
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#define _WINDOW_H_
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#include "nodes.h"
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#include "infomap.h"
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/* Smallest number of visible lines in a window. The actual height is
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always one more than this number because each window has a modeline. */
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#define WINDOW_MIN_HEIGHT 2
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/* Smallest number of screen lines that can be used to fully present a
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window. This number includes the modeline of the window. */
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#define WINDOW_MIN_SIZE (WINDOW_MIN_HEIGHT + 1)
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/* The exact same elements are used within the WINDOW_STATE structure and a
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subsection of the WINDOW structure. We could define a structure which
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contains this elements, and include that structure in each of WINDOW_STATE
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and WINDOW. But that would lead references in the code such as
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window->state->node which we would like to avoid. Instead, we #define the
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elements here, and simply include the define in both data structures. Thus,
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if you need to change window state information, here is where you would
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do it. NB> The last element does NOT end with a semi-colon. */
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#define WINDOW_STATE_DECL \
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NODE *node; /* The node displayed in this window. */ \
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int pagetop; /* LINE_STARTS[PAGETOP] is first line in WINDOW. */ \
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long point /* Offset within NODE of the cursor position. */
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/* Structure which defines a window. Windows are doubly linked, next
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and prev. The list of windows is kept on WINDOWS. The structure member
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window->height is the total height of the window. The position location
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(0, window->height + window->first_row) is the first character of this
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windows modeline. The number of lines that can be displayed in a window
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is equal to window->height - 1. */
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typedef struct __window__ {
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struct __window__ *next; /* Next window in this chain. */
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struct __window__ *prev; /* Previous window in this chain. */
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int width; /* Width of this window. */
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int height; /* Height of this window. */
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int first_row; /* Offset of the first line in the_screen. */
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int goal_column; /* The column we would like the cursor to appear in. */
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Keymap keymap; /* Keymap used to read commands in this window. */
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WINDOW_STATE_DECL; /* Node, pagetop and point. */
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char *modeline; /* Calculated text of the modeline for this window. */
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char **line_starts; /* Array of printed line starts for this node. */
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int line_count; /* Number of lines appearing in LINE_STARTS. */
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int flags; /* See below for details. */
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} WINDOW;
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typedef struct {
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WINDOW_STATE_DECL; /* What gets saved. */
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} WINDOW_STATE;
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#define W_UpdateWindow 0x01 /* WINDOW needs updating. */
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#define W_WindowIsPerm 0x02 /* This WINDOW is a permanent object. */
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#define W_WindowVisible 0x04 /* This WINDOW is currently visible. */
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#define W_InhibitMode 0x08 /* This WINDOW has no modeline. */
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#define W_NoWrap 0x10 /* Lines do not wrap in this window. */
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#define W_InputWindow 0x20 /* Window accepts input. */
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#define W_TempWindow 0x40 /* Window is less important. */
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extern WINDOW *windows; /* List of visible Info windows. */
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extern WINDOW *active_window; /* The currently active window. */
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extern WINDOW *the_screen; /* The Info screen is just another window. */
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extern WINDOW *the_echo_area; /* THE_ECHO_AREA is a window in THE_SCREEN. */
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/* Global variable control redisplay of scrolled windows. If non-zero, it
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is the desired number of lines to scroll the window in order to make
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point visible. A user might set this to 1 for smooth scrolling. If
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set to zero, the line containing point is centered within the window. */
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extern int window_scroll_step;
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/* Make the modeline member for WINDOW. */
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extern void window_make_modeline ();
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/* Initalize the window system by creating THE_SCREEN and THE_ECHO_AREA.
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Create the first window ever, and make it permanent.
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You pass WIDTH and HEIGHT; the dimensions of the total screen size. */
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extern void window_initialize_windows ();
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/* Make a new window showing NODE, and return that window structure.
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The new window is made to be the active window. If NODE is passed
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as NULL, then show the node showing in the active window. If the
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window could not be made return a NULL pointer. The active window
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is not changed.*/
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extern WINDOW *window_make_window ();
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/* Delete WINDOW from the list of known windows. If this window was the
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active window, make the next window in the chain be the active window,
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or the previous window in the chain if there is no next window. */
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extern void window_delete_window ();
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/* A function to call when the screen changes size, and some windows have
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to get deleted. The function is called with the window to be deleted
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as an argument, and it can't do anything about the window getting deleted;
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it can only clean up dangling references to that window. */
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extern VFunction *window_deletion_notifier;
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/* Set WINDOW to display NODE. */
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extern void window_set_node_of_window ();
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/* Tell the window system that the size of the screen has changed. This
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causes lots of interesting things to happen. The permanent windows
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are resized, as well as every visible window. You pass WIDTH and HEIGHT;
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the dimensions of the total screen size. */
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extern void window_new_screen_size ();
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/* Change the height of WINDOW by AMOUNT. This also automagically adjusts
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the previous and next windows in the chain. If there is only one user
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window, then no change takes place. */
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extern void window_change_window_height ();
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/* Adjust the pagetop of WINDOW such that the cursor point will be visible. */
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extern void window_adjust_pagetop ();
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/* Tile all of the windows currently displayed in the global variable
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WINDOWS. If argument DO_INTERNALS is non-zero, tile windows displaying
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internal nodes as well. */
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#define DONT_TILE_INTERNALS 0
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#define TILE_INTERNALS 1
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extern void window_tile_windows ();
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/* Toggle the state of line wrapping in WINDOW. This can do a bit of fancy
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redisplay. */
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extern void window_toggle_wrap ();
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/* For every window in CHAIN, set the flags member to have FLAG set. */
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extern void window_mark_chain ();
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/* For every window in CHAIN, clear the flags member of FLAG. */
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extern void window_unmark_chain ();
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/* Make WINDOW start displaying at PERCENT percentage of its node. */
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extern void window_goto_percentage ();
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/* Build a new node which has FORMAT printed with ARG1 and ARG2 as the
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contents. */
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extern NODE *build_message_node ();
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/* Useful functions can be called from outside of window.c. */
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extern void initialize_message_buffer ();
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/* Print FORMAT with ARG1,2 to the end of the current message buffer. */
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extern void printf_to_message_buffer ();
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/* Convert the contents of the message buffer to a node. */
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extern NODE *message_buffer_to_node ();
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/* Return the length of the most recently printed line in message buffer. */
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extern int message_buffer_length_this_line ();
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/* Pad STRING to COUNT characters by inserting blanks. */
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extern int pad_to ();
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/* Make a message appear in the echo area, built from FORMAT, ARG1 and ARG2.
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The arguments are treated similar to printf () arguments, but not all of
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printf () hair is present. The message appears immediately. If there was
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already a message appearing in the echo area, it is removed. */
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extern void window_message_in_echo_area ();
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/* Place a temporary message in the echo area built from FORMAT, ARG1
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and ARG2. The message appears immediately, but does not destroy
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any existing message. A future call to unmessage_in_echo_area ()
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restores the old contents. */
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extern void message_in_echo_area ();
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extern void unmessage_in_echo_area ();
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/* Clear the echo area, removing any message that is already present.
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The echo area is cleared immediately. */
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extern void window_clear_echo_area ();
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/* Quickly guess the approximate number of lines to that NODE would
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take to display. This really only counts carriage returns. */
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extern int window_physical_lines ();
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/* Calculate a list of line starts for the node belonging to WINDOW. The line
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starts are pointers to the actual text within WINDOW->NODE. */
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extern void calculate_line_starts ();
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/* Given WINDOW, recalculate the line starts for the node it displays. */
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extern void recalculate_line_starts ();
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/* Return the number of characters it takes to display CHARACTER on the
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screen at HPOS. */
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extern int character_width ();
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/* Return the number of characters it takes to display STRING on the
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screen at HPOS. */
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extern int string_width ();
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/* Return the index of the line containing point. */
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extern int window_line_of_point ();
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/* Get and return the goal column for this window. */
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extern int window_get_goal_column ();
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/* Get and return the printed column offset of the cursor in this window. */
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extern int window_get_cursor_column ();
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/* Get and Set the node, pagetop, and point of WINDOW. */
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extern void window_get_state (), window_set_state ();
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/* Count the number of characters in LINE that precede the printed column
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offset of GOAL. */
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extern int window_chars_to_goal ();
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#endif /* !_WINDOW_H_ */
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