edit/editdraw.c

   1 /* editor text drawing.
   2
   3    Copyright (C) 1996, 1997 the Free Software Foundation
   4
   5    Authors: 1996, 1997 Paul Sheer
   6
   7    $Id$
   8
   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 2 of the License, or
  12    (at your option) any later version.
  13
  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.
  18
  19    You should have received a copy of the GNU General Public License
  20    along with this program; if not, write to the Free Software
  21    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  22    02111-1307, USA.
  23 */
  24
  25 #include <config.h>
  26 #include "edit.h"
  27
  28 #define MAX_LINE_LEN 1024
  29
  30 #ifdef HAVE_CHARSET
  31 #include "src/charsets.h"
  32 #endif
  33
  34 extern int column_highlighting;
  35
  36 static void status_string (WEdit * edit, char *s, int w, int fill, int font_width)
  37 {
  38     char byte_str[16];
  39
  40     /*
  41      * If we are at the end of file, print <EOF>,
  42      * otherwise print the current character as is (if printable),
  43      * as decimal and as hex.
  44      */
  45     if (edit->curs1 < edit->last_byte) {
  46         unsigned char cur_byte = edit_get_byte (edit, edit->curs1);
  47         g_snprintf (byte_str, sizeof(byte_str), "%c %3d 0x%02X",
  48                     is_printable(cur_byte) ? cur_byte : '.',
  49                     cur_byte,
  50                     cur_byte);
  51     } else {
  52         strcpy(byte_str, "<EOF>");
  53     }
  54
  55     /* The field lengths just prevent the status line from shortening too much */
  56     g_snprintf (s, w,
  57                 "[%c%c%c%c] %2ld L:[%3ld+%2ld %3ld/%3ld] *(%-4ld/%4ldb)= %s",
  58                 edit->mark1 != edit->mark2 ? ( column_highlighting ? 'C' : 'B') : '-',
  59                 edit->modified ? 'M' : '-',
  60                 edit->macro_i < 0 ? '-' : 'R',
  61                 edit->overwrite == 0 ? '-' : 'O',
  62                 edit->curs_col / font_width,
  63
  64                 edit->start_line + 1,
  65                 edit->curs_row,
  66                 edit->curs_line + 1,
  67                 edit->total_lines + 1,
  68
  69                 edit->curs1,
  70                 edit->last_byte,
  71                 byte_str);
  72 }
  73
  74 /* how to get as much onto the status line as is numerically possible :) */
  75 void edit_status (WEdit * edit)
  76 {
  77     int w, i, t;
  78     char *s;
  79     w = edit->widget.cols - (edit->have_frame * 2);
  80     s = malloc (w + 15);
  81     if (w < 4)
  82         w = 4;
  83     memset (s, ' ', w);
  84     attrset (SELECTED_COLOR);
  85     if (w > 4) {
  86         widget_move (edit, edit->have_frame, edit->have_frame);
  87         i = w > 24 ? 18 : w - 6;
  88         i = i < 13 ? 13 : i;
  89         strcpy (s, (char *) name_trunc (edit->filename ? edit->filename : "", i));
  90         i = strlen (s);
  91         s[i] = ' ';
  92         t = w - 20;
  93         if (t < 0)
  94             t = 0;
  95         status_string (edit, s + 20, t, ' ', 1);
  96     }
  97     s[w] = 0;
  98
  99     printw ("%-*s", w, s);
 100     attrset (NORMAL_COLOR);
 101     free (s);
 102 }
 103
 104 /* result is boolean */
 105 int cursor_in_screen (WEdit * edit, long row)
 106 {
 107     if (row < 0 || row >= edit->num_widget_lines)
 108         return 0;
 109     else
 110         return 1;
 111 }
 112
 113 /* returns rows from the first displayed line to the cursor */
 114 int cursor_from_display_top (WEdit * edit)
 115 {
 116     if (edit->curs1 < edit->start_display)
 117         return -edit_move_forward (edit, edit->curs1, 0, edit->start_display);
 118     else
 119         return edit_move_forward (edit, edit->start_display, 0, edit->curs1);
 120 }
 121
 122 /* returns how far the cursor is out of the screen */
 123 int cursor_out_of_screen (WEdit * edit)
 124 {
 125     int row = cursor_from_display_top (edit);
 126     if (row >= edit->num_widget_lines)
 127         return row - edit->num_widget_lines + 1;
 128     if (row < 0)
 129         return row;
 130     return 0;
 131 }
 132
 133 /* this scrolls the text so that cursor is on the screen */
 134 void edit_scroll_screen_over_cursor (WEdit * edit)
 135 {
 136     int p;
 137     int outby;
 138     int b_extreme, t_extreme, l_extreme, r_extreme;
 139
 140     if (edit->num_widget_lines <= 0 || edit->num_widget_columns <= 0)
 141         return;
 142
 143     r_extreme = EDIT_RIGHT_EXTREME;
 144     l_extreme = EDIT_LEFT_EXTREME;
 145     b_extreme = EDIT_BOTTOM_EXTREME;
 146     t_extreme = EDIT_TOP_EXTREME;
 147     if (edit->found_len) {
 148         b_extreme = max (edit->num_widget_lines / 4, b_extreme);
 149         t_extreme = max (edit->num_widget_lines / 4, t_extreme);
 150     }
 151     if (b_extreme + t_extreme + 1 > edit->num_widget_lines) {
 152         int n;
 153         n = b_extreme + t_extreme;
 154         b_extreme = (b_extreme * (edit->num_widget_lines - 1)) / n;
 155         t_extreme = (t_extreme * (edit->num_widget_lines - 1)) / n;
 156     }
 157     if (l_extreme + r_extreme + 1 > edit->num_widget_columns) {
 158         int n;
 159         n = l_extreme + t_extreme;
 160         l_extreme = (l_extreme * (edit->num_widget_columns - 1)) / n;
 161         r_extreme = (r_extreme * (edit->num_widget_columns - 1)) / n;
 162     }
 163     p = edit_get_col (edit);
 164     edit_update_curs_row (edit);
 165     outby = p + edit->start_col - edit->num_widget_columns + 1 + (r_extreme + edit->found_len);
 166     if (outby > 0)
 167         edit_scroll_right (edit, outby);
 168     outby = l_extreme - p - edit->start_col;
 169     if (outby > 0)
 170         edit_scroll_left (edit, outby);
 171     p = edit->curs_row;
 172     outby = p - edit->num_widget_lines + 1 + b_extreme;
 173     if (outby > 0)
 174         edit_scroll_downward (edit, outby);
 175     outby = t_extreme - p;
 176     if (outby > 0)
 177         edit_scroll_upward (edit, outby);
 178     edit_update_curs_row (edit);
 179 }
 180
 181 #define set_color(font)    attrset (font)
 182
 183 #define edit_move(x,y) widget_move(edit, y, x);
 184
 185 static void print_to_widget (WEdit * edit, long row, int start_col, float start_col_real, long end_col, unsigned int line[])
 186 {
 187     int x = (float) start_col_real + EDIT_TEXT_HORIZONTAL_OFFSET;
 188     int x1 = start_col + EDIT_TEXT_HORIZONTAL_OFFSET;
 189     int y = row + EDIT_TEXT_VERTICAL_OFFSET;
 190
 191     set_color (EDITOR_NORMAL_COLOR);
 192     edit_move (x1, y);
 193     hline (' ', end_col + 1 - EDIT_TEXT_HORIZONTAL_OFFSET - x1);
 194
 195     edit_move (x + FONT_OFFSET_X, y + FONT_OFFSET_Y);
 196     {
 197         unsigned int *p = line;
 198         int textchar = ' ';
 199         long style;
 200
 201         while (*p) {
 202             style = *p >> 8;
 203             textchar = *p & 0xFF;
 204 #ifdef HAVE_SYNTAXH
 205             if (!(style & (0xFF - MOD_ABNORMAL - MOD_CURSOR)))
 206                 SLsmg_set_color ((*p & 0x007F0000) >> 16);
 207 #endif
 208             if (style & MOD_ABNORMAL)
 209                 textchar = '.';
 210             if (style & MOD_HIGHLIGHTED) {
 211                 set_color (EDITOR_BOLD_COLOR);
 212             } else if (style & MOD_MARKED) {
 213                 set_color (EDITOR_MARKED_COLOR);
 214             }
 215             if (style & MOD_UNDERLINED) {
 216                 set_color (EDITOR_UNDERLINED_COLOR);
 217             }
 218             if (style & MOD_BOLD) {
 219                 set_color (EDITOR_BOLD_COLOR);
 220             }
 221             addch (textchar);
 222             p++;
 223         }
 224     }
 225 }
 226
 227 /* b is a pointer to the beginning of the line */
 228 static void edit_draw_this_line (WEdit * edit, long b, long row, long start_col, long end_col)
 229 {
 230     static unsigned int line[MAX_LINE_LEN];
 231     unsigned int *p = line;
 232     long m1 = 0, m2 = 0, q, c1, c2;
 233     int col, start_col_real;
 234     unsigned int c;
 235     int fg, bg;
 236     int i, book_mark = -1;
 237
 238 #if 0
 239     if (!book_mark_query (edit, edit->start_line + row, &book_mark))
 240         book_mark = -1;
 241 #endif
 242
 243     edit_get_syntax_color (edit, b - 1, &fg, &bg);
 244     q = edit_move_forward3 (edit, b, start_col - edit->start_col, 0);
 245     start_col_real = (col = (int) edit_move_forward3 (edit, b, 0, q)) + edit->start_col;
 246     c1 = min (edit->column1, edit->column2);
 247     c2 = max (edit->column1, edit->column2);
 248
 249     if (col + 16 > -edit->start_col) {
 250         eval_marks (edit, &m1, &m2);
 251
 252         if (row <= edit->total_lines - edit->start_line) {
 253             while (col <= end_col - edit->start_col) {
 254                 *p = 0;
 255                 if (q == edit->curs1)
 256                     *p |= MOD_CURSOR * 256;
 257                 if (q >= m1 && q < m2) {
 258                     if (column_highlighting) {
 259                         int x;
 260                         x = edit_move_forward3 (edit, b, 0, q);
 261                         if (x >= c1 && x < c2)
 262                             *p |= MOD_MARKED * 256;
 263                     } else
 264                         *p |= MOD_MARKED * 256;
 265                 }
 266                 if (q == edit->bracket)
 267                     *p |= MOD_BOLD * 256;
 268                 if (q >= edit->found_start && q < edit->found_start + edit->found_len)
 269                     *p |= MOD_HIGHLIGHTED * 256;
 270                 c = edit_get_byte (edit, q);
 271 /* we don't use bg for mc - fg contains both */
 272                 if (book_mark == -1) {
 273                     edit_get_syntax_color (edit, q, &fg, &bg);
 274                     *p |= fg << 16;
 275                 } else {
 276                     *p |= book_mark << 16;
 277                 }
 278                 q++;
 279                 switch (c) {
 280                 case '\n':
 281                     col = end_col - edit->start_col + 1;        /* quit */
 282                     *(p++) |= ' ';
 283                     break;
 284                 case '\t':
 285                     i = TAB_SIZE - ((int) col % TAB_SIZE);
 286                     *p |= ' ';
 287                     c = *(p++) & (0xFFFFFFFF - MOD_CURSOR * 256);
 288                     col += i;
 289                     while (--i)
 290                         *(p++) = c;
 291                     break;
 292                 case '\r':
 293                     break;
 294                 default:
 295 #ifdef HAVE_CHARSET
 296                     if (c >= 0 && c <= 255)
 297                         c = conv_displ[ c ];
 298 #endif
 299                     if (is_printable (c)) {
 300                         *(p++) |= c;
 301                     } else {
 302                         *(p++) = '.';
 303                         *p |= (256 * MOD_ABNORMAL);
 304                     }
 305                     col++;
 306                     break;
 307                 }
 308             }
 309         }
 310     } else {
 311         start_col_real = start_col = 0;
 312     }
 313     *p = 0;
 314
 315     print_to_widget (edit, row, start_col, start_col_real, end_col, line);
 316 }
 317
 318 #define key_pending(x) (!is_idle())
 319
 320 static void edit_draw_this_char (WEdit * edit, long curs, long row)
 321 {
 322     int b = edit_bol (edit, curs);
 323     edit_draw_this_line (edit, b, row, 0, edit->num_widget_columns - 1);
 324 }
 325
 326 /* cursor must be in screen for other than REDRAW_PAGE passed in force */
 327 void render_edit_text (WEdit * edit, long start_row, long start_column, long end_row,
 328                        long end_column)
 329 {
 330     long row = 0, curs_row;
 331     static int prev_curs_row = 0;
 332     static int prev_start_col = 0;
 333     static long prev_curs = 0;
 334     static long prev_start = -1;
 335
 336     int force = edit->force;
 337     long b;
 338
 339     CPushFont ("editor", 0);
 340
 341 /*
 342  * If the position of the page has not moved then we can draw the cursor
 343  * character only.  This will prevent line flicker when using arrow keys.
 344  */
 345     if ((!(force & REDRAW_CHAR_ONLY)) || (force & REDRAW_PAGE)) {
 346         if (!(force & REDRAW_IN_BOUNDS)) {      /* !REDRAW_IN_BOUNDS means to ignore bounds and redraw whole rows */
 347             start_row = 0;
 348             end_row = edit->num_widget_lines - 1;
 349             start_column = 0;
 350             end_column = edit->num_widget_columns - 1;
 351         }
 352         if (force & REDRAW_PAGE) {
 353             row = start_row;
 354             b = edit_move_forward (edit, edit->start_display, start_row, 0);
 355             while (row <= end_row) {
 356                 if (key_pending (edit))
 357                     goto exit_render;
 358                 edit_draw_this_line (edit, b, row, start_column, end_column);
 359                 b = edit_move_forward (edit, b, 1, 0);
 360                 row++;
 361             }
 362         } else {
 363             curs_row = edit->curs_row;
 364
 365             if (force & REDRAW_BEFORE_CURSOR) {
 366                 if (start_row < curs_row) {
 367                     long upto = curs_row - 1 <= end_row ? curs_row - 1 : end_row;
 368                     row = start_row;
 369                     b = edit->start_display;
 370                     while (row <= upto) {
 371                         if (key_pending (edit))
 372                             goto exit_render;
 373                         edit_draw_this_line (edit, b, row, start_column, end_column);
 374                         b = edit_move_forward (edit, b, 1, 0);
 375                     }
 376                 }
 377             }
 378 /*          if (force & REDRAW_LINE)          ---> default */
 379             b = edit_bol (edit, edit->curs1);
 380             if (curs_row >= start_row && curs_row <= end_row) {
 381                 if (key_pending (edit))
 382                     goto exit_render;
 383                 edit_draw_this_line (edit, b, curs_row, start_column, end_column);
 384             }
 385             if (force & REDRAW_AFTER_CURSOR) {
 386                 if (end_row > curs_row) {
 387                     row = curs_row + 1 < start_row ? start_row : curs_row + 1;
 388                     b = edit_move_forward (edit, b, 1, 0);
 389                     while (row <= end_row) {
 390                         if (key_pending (edit))
 391                             goto exit_render;
 392                         edit_draw_this_line (edit, b, row, start_column, end_column);
 393                         b = edit_move_forward (edit, b, 1, 0);
 394                         row++;
 395                     }
 396                 }
 397             }
 398             if (force & REDRAW_LINE_ABOVE && curs_row >= 1) {
 399                 row = curs_row - 1;
 400                 b = edit_move_backward (edit, edit_bol (edit, edit->curs1), 1);
 401                 if (row >= start_row && row <= end_row) {
 402                     if (key_pending (edit))
 403                         goto exit_render;
 404                     edit_draw_this_line (edit, b, row, start_column, end_column);
 405                 }
 406             }
 407             if (force & REDRAW_LINE_BELOW && row < edit->num_widget_lines - 1) {
 408                 row = curs_row + 1;
 409                 b = edit_bol (edit, edit->curs1);
 410                 b = edit_move_forward (edit, b, 1, 0);
 411                 if (row >= start_row && row <= end_row) {
 412                     if (key_pending (edit))
 413                         goto exit_render;
 414                     edit_draw_this_line (edit, b, row, start_column, end_column);
 415                 }
 416             }
 417         }
 418     } else {
 419         if (prev_curs_row < edit->curs_row) {   /* with the new text highlighting, we must draw from the top down */
 420             edit_draw_this_char (edit, prev_curs, prev_curs_row);
 421             edit_draw_this_char (edit, edit->curs1, edit->curs_row);
 422         } else {
 423             edit_draw_this_char (edit, edit->curs1, edit->curs_row);
 424             edit_draw_this_char (edit, prev_curs, prev_curs_row);
 425         }
 426     }
 427
 428     edit->force = 0;
 429
 430     prev_curs_row = edit->curs_row;
 431     prev_curs = edit->curs1;
 432     prev_start_col = edit->start_col;
 433   exit_render:
 434     edit->screen_modified = 0;
 435     prev_start = edit->start_line;
 436     CPopFont ();
 437     return;
 438 }
 439
 440 void edit_set_space_width (int s);
 441 extern int option_long_whitespace;
 442
 443 void edit_render (WEdit * edit, int page, int row_start, int col_start, int row_end, int col_end)
 444 {
 445     if (page)                   /* if it was an expose event, 'page' would be set */
 446         edit->force |= REDRAW_PAGE | REDRAW_IN_BOUNDS;
 447
 448     if (edit->force & REDRAW_COMPLETELY)
 449         redraw_labels (edit->widget.parent, (Widget *) edit);
 450     render_edit_text (edit, row_start, col_start, row_end, col_end);
 451     /*
 452      * edit->force != 0 means a key was pending and the redraw
 453      * was halted, so next time we must redraw everything in case stuff
 454      * was left undrawn from a previous key press.
 455      */
 456     if (edit->force)
 457         edit->force |= REDRAW_PAGE;
 458 }
 459
 460 void edit_render_keypress (WEdit * edit)
 461 {
 462     edit_render (edit, 0, 0, 0, 0, 0);
 463 }