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mc/edit/editdraw.c

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/* editor text drawing.
Copyright (C) 1996, 1997 the Free Software Foundation
Authors: 1996, 1997 Paul Sheer
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
02110-1301, USA.
*/
#include <config.h>
#include <stdlib.h>
#include <stdio.h>
#include <stdarg.h>
#include <sys/types.h>
#ifdef HAVE_UNISTD_H
# include <unistd.h>
#endif
#include <string.h>
#include <ctype.h>
#include <errno.h>
#include <sys/stat.h>
#include "../src/global.h"
#include "edit.h"
#include "edit-widget.h"
#define MAX_LINE_LEN 1024
#include "../src/color.h" /* EDITOR_NORMAL_COLOR */
#include "../src/tty.h" /* attrset() */
#include "../src/widget.h" /* buttonbar_redraw() */
#include "../src/key.h" /* is_idle() */
#include "../src/charsets.h"
/* Text styles */
#define MOD_ABNORMAL (1 << 8)
#define MOD_BOLD (1 << 9)
#define MOD_MARKED (1 << 10)
#define MOD_CURSOR (1 << 11)
#define FONT_OFFSET_X 0
#define FONT_OFFSET_Y 0
#define FIXED_FONT 1
#define FONT_PIX_PER_LINE 1
#define FONT_MEAN_WIDTH 1
static void status_string (WEdit * edit, char *s, int w)
{
char byte_str[16];
/*
* If we are at the end of file, print <EOF>,
* otherwise print the current character as is (if printable),
* as decimal and as hex.
*/
if (edit->curs1 < edit->last_byte) {
unsigned char cur_byte = edit_get_byte (edit, edit->curs1);
g_snprintf (byte_str, sizeof (byte_str), "%c %3d 0x%02X",
is_printable (cur_byte) ? cur_byte : '.',
(int) cur_byte,
(unsigned) cur_byte);
} else {
strcpy (byte_str, "<EOF>");
}
/* The field lengths just prevent the status line from shortening too much */
g_snprintf (s, w,
"[%c%c%c%c] %2ld L:[%3ld+%2ld %3ld/%3ld] *(%-4ld/%4ldb)= %s",
edit->mark1 != edit->mark2 ? ( column_highlighting ? 'C' : 'B') : '-',
edit->modified ? 'M' : '-',
edit->macro_i < 0 ? '-' : 'R',
edit->overwrite == 0 ? '-' : 'O',
edit->curs_col,
edit->start_line + 1,
edit->curs_row,
edit->curs_line + 1,
edit->total_lines + 1,
edit->curs1,
edit->last_byte,
byte_str);
}
/* Draw the status line at the top of the widget. The size of the filename
* field varies depending on the width of the screen and the length of
* the filename. */
void
edit_status (WEdit *edit)
{
const int w = edit->widget.cols;
const size_t status_size = w + 1;
char * const status = g_malloc (status_size);
int status_len;
const char *fname = "";
int fname_len;
const int gap = 3; /* between the filename and the status */
const int right_gap = 2; /* at the right end of the screen */
const int preferred_fname_len = 16;
status_string (edit, status, status_size);
status_len = (int) strlen (status);
if (edit->filename)
fname = edit->filename;
fname_len = strlen(fname);
if (fname_len < preferred_fname_len)
fname_len = preferred_fname_len;
if (fname_len + gap + status_len + right_gap >= w) {
if (preferred_fname_len + gap + status_len + right_gap >= w)
fname_len = preferred_fname_len;
else
fname_len = w - (gap + status_len + right_gap);
fname = name_trunc (fname, fname_len);
}
widget_move (edit, 0, 0);
attrset (SELECTED_COLOR);
printwstr (fname, fname_len + gap);
printwstr (status, w - (fname_len + gap));
attrset (EDITOR_NORMAL_COLOR);
g_free (status);
}
/* this scrolls the text so that cursor is on the screen */
void edit_scroll_screen_over_cursor (WEdit * edit)
{
int p;
int outby;
int b_extreme, t_extreme, l_extreme, r_extreme;
if (edit->num_widget_lines <= 0 || edit->num_widget_columns <= 0)
return;
r_extreme = EDIT_RIGHT_EXTREME;
l_extreme = EDIT_LEFT_EXTREME;
b_extreme = EDIT_BOTTOM_EXTREME;
t_extreme = EDIT_TOP_EXTREME;
if (edit->found_len) {
b_extreme = max (edit->num_widget_lines / 4, b_extreme);
t_extreme = max (edit->num_widget_lines / 4, t_extreme);
}
if (b_extreme + t_extreme + 1 > edit->num_widget_lines) {
int n;
n = b_extreme + t_extreme;
b_extreme = (b_extreme * (edit->num_widget_lines - 1)) / n;
t_extreme = (t_extreme * (edit->num_widget_lines - 1)) / n;
}
if (l_extreme + r_extreme + 1 > edit->num_widget_columns) {
int n;
n = l_extreme + t_extreme;
l_extreme = (l_extreme * (edit->num_widget_columns - 1)) / n;
r_extreme = (r_extreme * (edit->num_widget_columns - 1)) / n;
}
p = edit_get_col (edit);
edit_update_curs_row (edit);
outby = p + edit->start_col - edit->num_widget_columns + 1 + (r_extreme + edit->found_len);
if (outby > 0)
edit_scroll_right (edit, outby);
outby = l_extreme - p - edit->start_col;
if (outby > 0)
edit_scroll_left (edit, outby);
p = edit->curs_row;
outby = p - edit->num_widget_lines + 1 + b_extreme;
if (outby > 0)
edit_scroll_downward (edit, outby);
outby = t_extreme - p;
if (outby > 0)
edit_scroll_upward (edit, outby);
edit_update_curs_row (edit);
}
#define set_color(font) attrset (font)
#define edit_move(x,y) widget_move(edit, y, x);
/* Set colorpair by index, don't interpret S-Lang "emulated attributes" */
#ifdef HAVE_SLANG
#define lowlevel_set_color(x) SLsmg_set_color(x & 0x7F)
#else
#define lowlevel_set_color(x) attrset(MY_COLOR_PAIR(color))
#endif
static void
print_to_widget (WEdit *edit, long row, int start_col, int start_col_real,
long end_col, unsigned int line[])
{
unsigned int *p;
int x = start_col_real + EDIT_TEXT_HORIZONTAL_OFFSET;
int x1 = start_col + EDIT_TEXT_HORIZONTAL_OFFSET;
int y = row + EDIT_TEXT_VERTICAL_OFFSET;
int cols_to_skip = abs (x);
set_color (EDITOR_NORMAL_COLOR);
edit_move (x1, y);
hline (' ', end_col + 1 - EDIT_TEXT_HORIZONTAL_OFFSET - x1);
edit_move (x1 + FONT_OFFSET_X, y + FONT_OFFSET_Y);
p = line;
while (*p) {
int style;
int textchar;
int color;
if (cols_to_skip) {
p++;
cols_to_skip--;
continue;
}
style = *p & 0xFF00;
textchar = *p & 0xFF;
color = *p >> 16;
if (style & MOD_ABNORMAL) {
/* Non-printable - use black background */
color = 0;
}
if (style & MOD_BOLD) {
set_color (EDITOR_BOLD_COLOR);
} else if (style & MOD_MARKED) {
set_color (EDITOR_MARKED_COLOR);
} else {
lowlevel_set_color (color);
}
addch (textchar);
p++;
}
}
/* b is a pointer to the beginning of the line */
static void
edit_draw_this_line (WEdit *edit, long b, long row, long start_col,
long end_col)
{
static unsigned int line[MAX_LINE_LEN];
unsigned int *p = line;
long m1 = 0, m2 = 0, q, c1, c2;
int col, start_col_real;
unsigned int c;
int color;
int i, book_mark = -1;
#if 0
if (!book_mark_query (edit, edit->start_line + row, &book_mark))
book_mark = -1;
#endif
edit_get_syntax_color (edit, b - 1, &color);
q = edit_move_forward3 (edit, b, start_col - edit->start_col, 0);
start_col_real = (col =
(int) edit_move_forward3 (edit, b, 0,
q)) + edit->start_col;
c1 = min (edit->column1, edit->column2);
c2 = max (edit->column1, edit->column2);
if (col + 16 > -edit->start_col) {
eval_marks (edit, &m1, &m2);
if (row <= edit->total_lines - edit->start_line) {
while (col <= end_col - edit->start_col) {
*p = 0;
if (q == edit->curs1)
*p |= MOD_CURSOR;
if (q >= m1 && q < m2) {
if (column_highlighting) {
int x;
x = edit_move_forward3 (edit, b, 0, q);
if (x >= c1 && x < c2)
*p |= MOD_MARKED;
} else
*p |= MOD_MARKED;
}
if (q == edit->bracket)
*p |= MOD_BOLD;
if (q >= edit->found_start
&& q < edit->found_start + edit->found_len)
*p |= MOD_BOLD;
c = edit_get_byte (edit, q);
/* we don't use bg for mc - fg contains both */
if (book_mark == -1) {
edit_get_syntax_color (edit, q, &color);
*p |= color << 16;
} else {
*p |= book_mark << 16;
}
q++;
switch (c) {
case '\n':
col = end_col - edit->start_col + 1; /* quit */
*(p++) |= ' ';
break;
case '\t':
i = TAB_SIZE - ((int) col % TAB_SIZE);
*p |= ' ';
c = *(p++) & ~MOD_CURSOR;
col += i;
while (--i)
*(p++) = c;
break;
default:
c = convert_to_display_c (c);
/* Caret notation for control characters */
if (c < 32) {
*(p++) = '^' | MOD_ABNORMAL;
*(p++) = (c + 0x40) | MOD_ABNORMAL;
col += 2;
break;
}
if (c == 127) {
*(p++) = '^' | MOD_ABNORMAL;
*(p++) = '?' | MOD_ABNORMAL;
col += 2;
break;
}
if (is_printable (c)) {
*(p++) |= c;
} else {
*(p++) = '.' | MOD_ABNORMAL;
}
col++;
break;
}
}
}
} else {
start_col_real = start_col = 0;
}
*p = 0;
print_to_widget (edit, row, start_col, start_col_real, end_col, line);
}
#define key_pending(x) (!is_idle())
static void edit_draw_this_char (WEdit * edit, long curs, long row)
{
int b = edit_bol (edit, curs);
edit_draw_this_line (edit, b, row, 0, edit->num_widget_columns - 1);
}
/* cursor must be in screen for other than REDRAW_PAGE passed in force */
static void
render_edit_text (WEdit * edit, long start_row, long start_column, long end_row,
long end_column)
{
long row = 0, curs_row;
static int prev_curs_row = 0;
static int prev_start_col = 0;
static long prev_curs = 0;
static long prev_start = -1;
int force = edit->force;
long b;
/*
* If the position of the page has not moved then we can draw the cursor
* character only. This will prevent line flicker when using arrow keys.
*/
if ((!(force & REDRAW_CHAR_ONLY)) || (force & REDRAW_PAGE)) {
if (!(force & REDRAW_IN_BOUNDS)) { /* !REDRAW_IN_BOUNDS means to ignore bounds and redraw whole rows */
start_row = 0;
end_row = edit->num_widget_lines - 1;
start_column = 0;
end_column = edit->num_widget_columns - 1;
}
if (force & REDRAW_PAGE) {
row = start_row;
b = edit_move_forward (edit, edit->start_display, start_row, 0);
while (row <= end_row) {
if (key_pending (edit))
goto exit_render;
edit_draw_this_line (edit, b, row, start_column, end_column);
b = edit_move_forward (edit, b, 1, 0);
row++;
}
} else {
curs_row = edit->curs_row;
if (force & REDRAW_BEFORE_CURSOR) {
if (start_row < curs_row) {
long upto = curs_row - 1 <= end_row ? curs_row - 1 : end_row;
row = start_row;
b = edit->start_display;
while (row <= upto) {
if (key_pending (edit))
goto exit_render;
edit_draw_this_line (edit, b, row, start_column, end_column);
b = edit_move_forward (edit, b, 1, 0);
}
}
}
/* if (force & REDRAW_LINE) ---> default */
b = edit_bol (edit, edit->curs1);
if (curs_row >= start_row && curs_row <= end_row) {
if (key_pending (edit))
goto exit_render;
edit_draw_this_line (edit, b, curs_row, start_column, end_column);
}
if (force & REDRAW_AFTER_CURSOR) {
if (end_row > curs_row) {
row = curs_row + 1 < start_row ? start_row : curs_row + 1;
b = edit_move_forward (edit, b, 1, 0);
while (row <= end_row) {
if (key_pending (edit))
goto exit_render;
edit_draw_this_line (edit, b, row, start_column, end_column);
b = edit_move_forward (edit, b, 1, 0);
row++;
}
}
}
if (force & REDRAW_LINE_ABOVE && curs_row >= 1) {
row = curs_row - 1;
b = edit_move_backward (edit, edit_bol (edit, edit->curs1), 1);
if (row >= start_row && row <= end_row) {
if (key_pending (edit))
goto exit_render;
edit_draw_this_line (edit, b, row, start_column, end_column);
}
}
if (force & REDRAW_LINE_BELOW && row < edit->num_widget_lines - 1) {
row = curs_row + 1;
b = edit_bol (edit, edit->curs1);
b = edit_move_forward (edit, b, 1, 0);
if (row >= start_row && row <= end_row) {
if (key_pending (edit))
goto exit_render;
edit_draw_this_line (edit, b, row, start_column, end_column);
}
}
}
} else {
if (prev_curs_row < edit->curs_row) { /* with the new text highlighting, we must draw from the top down */
edit_draw_this_char (edit, prev_curs, prev_curs_row);
edit_draw_this_char (edit, edit->curs1, edit->curs_row);
} else {
edit_draw_this_char (edit, edit->curs1, edit->curs_row);
edit_draw_this_char (edit, prev_curs, prev_curs_row);
}
}
edit->force = 0;
prev_curs_row = edit->curs_row;
prev_curs = edit->curs1;
prev_start_col = edit->start_col;
exit_render:
edit->screen_modified = 0;
prev_start = edit->start_line;
return;
}
static void
edit_render (WEdit * edit, int page, int row_start, int col_start, int row_end, int col_end)
{
if (page) /* if it was an expose event, 'page' would be set */
edit->force |= REDRAW_PAGE | REDRAW_IN_BOUNDS;
if (edit->force & REDRAW_COMPLETELY)
buttonbar_redraw (edit->widget.parent);
render_edit_text (edit, row_start, col_start, row_end, col_end);
/*
* edit->force != 0 means a key was pending and the redraw
* was halted, so next time we must redraw everything in case stuff
* was left undrawn from a previous key press.
*/
if (edit->force)
edit->force |= REDRAW_PAGE;
}
void edit_render_keypress (WEdit * edit)
{
edit_render (edit, 0, 0, 0, 0, 0);
}
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