edit/editdraw.c

   1 /* editor text drawing.
   2
   3    Copyright (C) 1996, 1997, 1998, 2001, 2002, 2003, 2004, 2005, 2006,
   4    2007 Free Software Foundation, Inc.
   5
   6    Authors: 1996, 1997 Paul Sheer
   7
   8    This program is free software; you can redistribute it and/or modify
   9    it under the terms of the GNU General Public License as published by
  10    the Free Software Foundation; either version 2 of the License, or
  11    (at your option) any later version.
  12
  13    This program is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16    GNU General Public License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with this program; if not, write to the Free Software
  20    Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  21    02110-1301, USA.
  22 */
  23
  24 /** \file
  25  *  \brief Source: editor text drawing
  26  *  \author Paul Sheer
  27  *  \date 1996, 1997
  28  */
  29
  30 #include <config.h>
  31 #include <stdlib.h>
  32 #include <stdio.h>
  33 #include <stdarg.h>
  34 #include <sys/types.h>
  35 #include <unistd.h>
  36 #include <string.h>
  37 #include <ctype.h>
  38 #include <errno.h>
  39 #include <sys/stat.h>
  40
  41 #include "../src/global.h"
  42
  43 #include "edit-impl.h"
  44 #include "edit-widget.h"
  45
  46 #define MAX_LINE_LEN 1024
  47
  48 #include "../src/tty/tty.h"             /* tty_printf() */
  49 #include "../src/skin/skin.h"
  50 #include "../src/tty/key.h"             /* is_idle() */
  51
  52 #include "../src/widget.h"              /* buttonbar_redraw() */
  53 #include "../src/charsets.h"
  54 #include "../src/strutil.h"             /* utf string functions */
  55 #include "../src/main.h"                /* source_codepage */
  56
  57 /* Text styles */
  58 #define MOD_ABNORMAL            (1 << 8)
  59 #define MOD_BOLD                (1 << 9)
  60 #define MOD_MARKED              (1 << 10)
  61 #define MOD_CURSOR              (1 << 11)
  62 #define MOD_WHITESPACE          (1 << 12)
  63
  64 #define FONT_OFFSET_X 0
  65 #define FONT_OFFSET_Y 0
  66 #define FIXED_FONT 1
  67 #define FONT_PIX_PER_LINE 1
  68 #define FONT_MEAN_WIDTH 1
  69
  70 /* Toggles statusbar draw style */
  71 int simple_statusbar = 0;
  72
  73 static void status_string (WEdit * edit, char *s, int w)
  74 {
  75     char byte_str[16];
  76     unsigned char cur_byte = 0;
  77     unsigned int cur_utf = 0;
  78     int cw = 1;
  79
  80     /*
  81      * If we are at the end of file, print <EOF>,
  82      * otherwise print the current character as is (if printable),
  83      * as decimal and as hex.
  84      */
  85     if (edit->curs1 < edit->last_byte) {
  86         if ( !edit->utf8 ) {
  87             cur_byte = edit_get_byte (edit, edit->curs1);
  88
  89             g_snprintf (byte_str, sizeof (byte_str), "%4d 0x%03X",
  90                         (int) cur_byte,
  91                         (unsigned) cur_byte);
  92         } else {
  93             cur_utf = edit_get_utf (edit, edit->curs1, &cw);
  94             if ( cw > 0 ) {
  95                 g_snprintf (byte_str, sizeof (byte_str), "%04d 0x%03X",
  96                             (unsigned) cur_utf,
  97                             (unsigned) cur_utf);
  98             } else {
  99                 cur_utf = edit_get_byte (edit, edit->curs1);
 100                 g_snprintf (byte_str, sizeof (byte_str), "%04d 0x%03X",
 101                             (int) cur_utf,
 102                             (unsigned) cur_utf);
 103             }
 104
 105         }
 106     } else {
 107         strcpy (byte_str, "<EOF>     ");
 108     }
 109
 110     /* The field lengths just prevent the status line from shortening too much */
 111     if (simple_statusbar)
 112         g_snprintf (s, w,
 113                         "%c%c%c%c %3ld %5ld/%ld %6ld/%ld %s %s",
 114                         edit->mark1 != edit->mark2 ? ( column_highlighting ? 'C' : 'B') : '-',
 115                         edit->modified ? 'M' : '-',
 116                         edit->macro_i < 0 ? '-' : 'R',
 117                         edit->overwrite == 0 ? '-' : 'O',
 118                         edit->curs_col + edit->over_col,
 119
 120                         edit->curs_line + 1,
 121                         edit->total_lines + 1,
 122
 123                         edit->curs1,
 124                         edit->last_byte,
 125                         byte_str,
 126
 127 #ifdef HAVE_CHARSET
 128                         source_codepage >= 0 ? get_codepage_id (source_codepage) : ""
 129 #else
 130                         ""
 131 #endif
 132                     );
 133     else
 134         g_snprintf (s, w,
 135                         "[%c%c%c%c] %2ld L:[%3ld+%2ld %3ld/%3ld] *(%-4ld/%4ldb) %s  %s",
 136                         edit->mark1 != edit->mark2 ? ( column_highlighting ? 'C' : 'B') : '-',
 137                         edit->modified ? 'M' : '-',
 138                         edit->macro_i < 0 ? '-' : 'R',
 139                         edit->overwrite == 0 ? '-' : 'O',
 140                         edit->curs_col + edit->over_col,
 141
 142                         edit->start_line + 1,
 143                         edit->curs_row,
 144                         edit->curs_line + 1,
 145                         edit->total_lines + 1,
 146
 147                         edit->curs1,
 148                         edit->last_byte,
 149                         byte_str,
 150
 151 #ifdef HAVE_CHARSET
 152                         source_codepage >= 0 ? get_codepage_id (source_codepage) : ""
 153 #else
 154                         ""
 155 #endif
 156                     );
 157 }
 158
 159 static inline void
 160 printwstr (const char *s, int len)
 161 {
 162     if (len > 0)
 163         tty_printf ("%-*.*s", len, len, s);
 164 }
 165
 166 /* Draw the status line at the top of the widget. The size of the filename
 167  * field varies depending on the width of the screen and the length of
 168  * the filename. */
 169 void
 170 edit_status (WEdit *edit)
 171 {
 172     const int w = edit->widget.cols;
 173     const size_t status_size = w + 1;
 174     char * const status = g_malloc (status_size);
 175     int status_len;
 176     const char *fname = "";
 177     int fname_len;
 178     const int gap = 3; /* between the filename and the status */
 179     const int right_gap = 5; /* at the right end of the screen */
 180     const int preferred_fname_len = 16;
 181
 182     status_string (edit, status, status_size);
 183     status_len = (int) str_term_width1 (status);
 184
 185     if (edit->filename)
 186         fname = edit->filename;
 187     fname_len = str_term_width1 (fname);
 188     if (fname_len < preferred_fname_len)
 189         fname_len = preferred_fname_len;
 190
 191     if (fname_len + gap + status_len + right_gap >= w) {
 192         if (preferred_fname_len + gap + status_len + right_gap >= w)
 193             fname_len = preferred_fname_len;
 194         else
 195             fname_len = w - (gap + status_len + right_gap);
 196         fname = str_trunc (fname, fname_len);
 197     }
 198
 199     widget_move (edit, 0, 0);
 200     tty_setcolor (SELECTED_COLOR);
 201     printwstr (fname, fname_len + gap);
 202     printwstr (status, w - (fname_len + gap));
 203
 204     if (simple_statusbar && edit->widget.cols > 30) {
 205         size_t percent;
 206         if (edit->total_lines + 1 != 0)
 207             percent = (edit->curs_line + 1) * 100 / (edit->total_lines + 1);
 208         else
 209             percent = 100;
 210         widget_move (edit, 0, edit->widget.cols - 5);
 211         tty_printf (" %3d%%", percent);
 212     }
 213     tty_setcolor (EDITOR_NORMAL_COLOR);
 214
 215     g_free (status);
 216 }
 217
 218 /* this scrolls the text so that cursor is on the screen */
 219 void edit_scroll_screen_over_cursor (WEdit * edit)
 220 {
 221     int p;
 222     int outby;
 223     int b_extreme, t_extreme, l_extreme, r_extreme;
 224
 225     if (edit->num_widget_lines <= 0 || edit->num_widget_columns <= 0)
 226         return;
 227
 228     edit->num_widget_columns -= EDIT_TEXT_HORIZONTAL_OFFSET + option_line_state_width;
 229     edit->num_widget_lines -= EDIT_TEXT_VERTICAL_OFFSET - 1;
 230
 231     r_extreme = EDIT_RIGHT_EXTREME;
 232     l_extreme = EDIT_LEFT_EXTREME;
 233     b_extreme = EDIT_BOTTOM_EXTREME;
 234     t_extreme = EDIT_TOP_EXTREME;
 235     if (edit->found_len) {
 236         b_extreme = max (edit->num_widget_lines / 4, b_extreme);
 237         t_extreme = max (edit->num_widget_lines / 4, t_extreme);
 238     }
 239     if (b_extreme + t_extreme + 1 > edit->num_widget_lines) {
 240         int n;
 241         n = b_extreme + t_extreme;
 242         b_extreme = (b_extreme * (edit->num_widget_lines - 1)) / n;
 243         t_extreme = (t_extreme * (edit->num_widget_lines - 1)) / n;
 244     }
 245     if (l_extreme + r_extreme + 1 > edit->num_widget_columns) {
 246         int n;
 247         n = l_extreme + t_extreme;
 248         l_extreme = (l_extreme * (edit->num_widget_columns - 1)) / n;
 249         r_extreme = (r_extreme * (edit->num_widget_columns - 1)) / n;
 250     }
 251     p = edit_get_col (edit) + edit->over_col;
 252     edit_update_curs_row (edit);
 253     outby = p + edit->start_col - edit->num_widget_columns + 1 + (r_extreme + edit->found_len);
 254     if (outby > 0)
 255         edit_scroll_right (edit, outby);
 256     outby = l_extreme - p - edit->start_col;
 257     if (outby > 0)
 258         edit_scroll_left (edit, outby);
 259     p = edit->curs_row;
 260     outby = p - edit->num_widget_lines + 1 + b_extreme;
 261     if (outby > 0)
 262         edit_scroll_downward (edit, outby);
 263     outby = t_extreme - p;
 264     if (outby > 0)
 265         edit_scroll_upward (edit, outby);
 266     edit_update_curs_row (edit);
 267
 268     edit->num_widget_lines += EDIT_TEXT_VERTICAL_OFFSET - 1;
 269     edit->num_widget_columns += EDIT_TEXT_HORIZONTAL_OFFSET + option_line_state_width;
 270 }
 271
 272 #define edit_move(x,y) widget_move(edit, y, x);
 273
 274 struct line_s {
 275     unsigned int ch;
 276     unsigned int style;
 277 };
 278
 279 static void
 280 print_to_widget (WEdit *edit, long row, int start_col, int start_col_real,
 281                  long end_col, struct line_s line[], char *status)
 282 {
 283     struct line_s *p;
 284
 285     int x = start_col_real;
 286     int x1 = start_col + EDIT_TEXT_HORIZONTAL_OFFSET + option_line_state_width;
 287     int y = row + EDIT_TEXT_VERTICAL_OFFSET;
 288     int cols_to_skip = abs (x);
 289
 290     tty_setcolor (EDITOR_NORMAL_COLOR);
 291     tty_draw_hline (edit->widget.y + y, edit->widget.x + x1,
 292                     ' ', end_col + 1 - start_col);
 293
 294     if (option_line_state) {
 295         int i;
 296         for (i = 0; i < LINE_STATE_WIDTH; i++)
 297             if (status[i] == '\0')
 298                 status[i] = ' ';
 299
 300         tty_setcolor (LINE_STATE_COLOR);
 301         edit_move (x1 + FONT_OFFSET_X - option_line_state_width, y + FONT_OFFSET_Y);
 302         tty_print_string (status);
 303     }
 304
 305     edit_move (x1 + FONT_OFFSET_X, y + FONT_OFFSET_Y);
 306     p = line;
 307
 308     while (p->ch) {
 309         int style;
 310         unsigned int textchar;
 311         int color;
 312
 313         if (cols_to_skip) {
 314             p++;
 315             cols_to_skip--;
 316             continue;
 317         }
 318
 319         style = p->style & 0xFF00;
 320         textchar = p->ch;
 321         color = p->style >> 16;
 322
 323         if (style & MOD_ABNORMAL) {
 324             /* Non-printable - use black background */
 325             color = 0;
 326         }
 327
 328         if (style & MOD_WHITESPACE) {
 329             if (style & MOD_MARKED) {
 330                 textchar = ' ';
 331                 tty_setcolor (EDITOR_MARKED_COLOR);
 332             } else {
 333 #if 0
 334                 if (color != EDITOR_NORMAL_COLOR) {
 335                     textchar = ' ';
 336                     tty_lowlevel_setcolor (color);
 337                 } else
 338 #endif
 339                     tty_setcolor (EDITOR_WHITESPACE_COLOR);
 340             }
 341         } else {
 342             if (style & MOD_BOLD) {
 343                 tty_setcolor (EDITOR_BOLD_COLOR);
 344             } else if (style & MOD_MARKED) {
 345                 tty_setcolor (EDITOR_MARKED_COLOR);
 346             } else {
 347                 tty_lowlevel_setcolor (color);
 348             }
 349         }
 350         tty_print_anychar (textchar);
 351         p++;
 352     }
 353 }
 354
 355 int visible_tabs = 1, visible_tws = 1;
 356
 357 /* b is a pointer to the beginning of the line */
 358 static void
 359 edit_draw_this_line (WEdit *edit, long b, long row, long start_col,
 360                      long end_col)
 361 {
 362     struct line_s line[MAX_LINE_LEN];
 363     struct line_s *p = line;
 364
 365     long m1 = 0, m2 = 0, q, c1, c2;
 366     int col, start_col_real;
 367     int cw;
 368     unsigned int c;
 369     int color;
 370     int abn_style;
 371     int i;
 372     int utf8lag = 0;
 373     unsigned int cur_line = 0;
 374     int book_mark = 0;
 375     char line_stat[LINE_STATE_WIDTH + 1];
 376
 377     if (row > edit->num_widget_lines - EDIT_TEXT_VERTICAL_OFFSET) {
 378          return;
 379     }
 380     if (book_mark_query_color(edit, edit->start_line + row, BOOK_MARK_COLOR)) {
 381         book_mark = BOOK_MARK_COLOR;
 382     } else if (book_mark_query_color(edit, edit->start_line + row, BOOK_MARK_FOUND_COLOR)) {
 383         book_mark = BOOK_MARK_FOUND_COLOR;
 384     }
 385
 386     if (book_mark)
 387         abn_style = book_mark << 16;
 388     else
 389         abn_style = MOD_ABNORMAL;
 390
 391     end_col -= EDIT_TEXT_HORIZONTAL_OFFSET + option_line_state_width;
 392
 393     edit_get_syntax_color (edit, b - 1, &color);
 394     q = edit_move_forward3 (edit, b, start_col - edit->start_col, 0);
 395     start_col_real = (col =
 396                       (int) edit_move_forward3 (edit, b, 0,
 397                                                 q)) + edit->start_col;
 398     if ( option_line_state ) {
 399         cur_line = edit->start_line + row;
 400         if ( cur_line <= (unsigned int) edit->total_lines ) {
 401             g_snprintf (line_stat, LINE_STATE_WIDTH + 1, "%7i ", cur_line + 1);
 402         } else {
 403             memset(line_stat, ' ', LINE_STATE_WIDTH);
 404             line_stat[LINE_STATE_WIDTH] = '\0';
 405         }
 406         if (book_mark_query_color (edit, cur_line, BOOK_MARK_COLOR)){
 407             g_snprintf (line_stat, 2, "*");
 408         }
 409     }
 410
 411     if (col + 16 > -edit->start_col) {
 412         eval_marks (edit, &m1, &m2);
 413
 414         if (row <= edit->total_lines - edit->start_line) {
 415                 long tws = 0;
 416             if (tty_use_colors () && visible_tws) {
 417                 tws = edit_eol (edit, b);
 418                 while (tws > b && ((c = edit_get_byte (edit, tws - 1)) == ' '
 419                                    || c == '\t'))
 420                     tws--;
 421             }
 422
 423             while (col <= end_col - edit->start_col) {
 424                 p->ch = 0;
 425                 p->style = 0;
 426                 if (q == edit->curs1)
 427                     p->style |= MOD_CURSOR;
 428                 if (q >= m1 && q < m2) {
 429                     if (column_highlighting) {
 430                         int x;
 431                         x = edit_move_forward3 (edit, b, 0, q);
 432                         c1 = min (edit->column1, edit->column2);
 433                         c2 = max (edit->column1, edit->column2);
 434                         if (x >= c1 && x < c2)
 435                             p->style |= MOD_MARKED;
 436                     } else
 437                         p->style |= MOD_MARKED;
 438                 }
 439                 if (q == edit->bracket)
 440                     p->style |= MOD_BOLD;
 441                 if (q >= edit->found_start
 442                     && q < edit->found_start + edit->found_len)
 443                     p->style |= MOD_BOLD;
 444                 cw = 1;
 445                 if ( !edit->utf8 ) {
 446                     c = edit_get_byte (edit, q);
 447                 } else {
 448                     c = edit_get_utf (edit, q, &cw);
 449                 }
 450                 /* we don't use bg for mc - fg contains both */
 451                 if (book_mark) {
 452                     p->style |= book_mark << 16;
 453                 } else {
 454                     edit_get_syntax_color (edit, q, &color);
 455                     p->style |= color << 16;
 456                 }
 457                 switch (c) {
 458                 case '\n':
 459                     col = (end_col + utf8lag) - edit->start_col + 1;    /* quit */
 460                     break;
 461                 case '\t':
 462                     i = TAB_SIZE - ((int) col % TAB_SIZE);
 463                     col += i;
 464                     if (tty_use_colors() &&
 465                        ((visible_tabs || (visible_tws && q >= tws)) && enable_show_tabs_tws)) {
 466                         if (p->style & MOD_MARKED)
 467                             c = p->style;
 468                         else if (book_mark)
 469                             c |= book_mark << 16;
 470                         else
 471                             c = p->style | MOD_WHITESPACE;
 472                         if (i > 2) {
 473                             p->ch = '<';
 474                             p->style = c;
 475                             p++;
 476                             while (--i > 1) {
 477                                 p->ch = '-';
 478                                 p->style = c;
 479                                 p++;
 480                             }
 481                             p->ch = '>';
 482                             p->style = c;
 483                             p++;
 484                         } else if (i > 1) {
 485                             p->ch = '<';
 486                             p->style = c;
 487                             p++;
 488                             p->ch = '>';
 489                             p->style = c;
 490                             p++;
 491                         } else {
 492                             p->ch = '>';
 493                             p->style = c;
 494                             p++;
 495                         }
 496                     } else if (tty_use_colors() && visible_tws && q >= tws && enable_show_tabs_tws) {
 497                         p->ch = '.';
 498                         p->style |= MOD_WHITESPACE;
 499                         c = p->style & ~MOD_CURSOR;
 500                         p++;
 501                         while (--i) {
 502                             p->ch = ' ';
 503                             p->style = c;
 504                             p++;
 505                         }
 506                     } else {
 507                         p->ch |= ' ';
 508                         c = p->style & ~MOD_CURSOR;
 509                         p++;
 510                         while (--i) {
 511                             p->ch = ' ';
 512                             p->style = c;
 513                             p++;
 514                         }
 515                     }
 516                     break;
 517                 case ' ':
 518                     if (tty_use_colors() && visible_tws && q >= tws && enable_show_tabs_tws) {
 519                         p->ch = '.';
 520                         p->style |= MOD_WHITESPACE;
 521                         p++;
 522                         col++;
 523                         break;
 524                     }
 525                     /* fallthrough */
 526                 default:
 527 #ifdef HAVE_CHARSET
 528                     if ( utf8_display ) {
 529                         if ( !edit->utf8 ) {
 530                             c = convert_from_8bit_to_utf_c ((unsigned char) c, edit->converter);
 531                         }
 532                     } else {
 533                         if ( edit->utf8 ) {
 534                             c = convert_from_utf_to_current_c (c, edit->converter);
 535                         } else {
 536 #endif
 537                             c = convert_to_display_c (c);
 538 #ifdef HAVE_CHARSET
 539                         }
 540                     }
 541 #endif
 542                     /* Caret notation for control characters */
 543                     if (c < 32) {
 544                         p->ch = '^';
 545                         p->style = abn_style;
 546                         p++;
 547                         p->ch = c + 0x40;
 548                         p->style = abn_style;
 549                         p++;
 550                         col += 2;
 551                         break;
 552                     }
 553                     if (c == 127) {
 554                         p->ch = '^';
 555                         p->style = abn_style;
 556                         p++;
 557                         p->ch = '?';
 558                         p->style = abn_style;
 559                         p++;
 560                         col += 2;
 561                         break;
 562                     }
 563                     if (!edit->utf8) {
 564                         if ( ( utf8_display && g_unichar_isprint (c) ) ||
 565                              ( !utf8_display && is_printable (c) ) ) {
 566                                 p->ch = c;
 567                                 p++;
 568                         } else {
 569                                 p->ch = '.';
 570                                 p->style = abn_style;
 571                                 p++;
 572                         }
 573                     } else {
 574                         if ( g_unichar_isprint (c) ) {
 575                             p->ch = c;
 576                             p++;
 577                         } else {
 578                             p->ch = '.';
 579                             p->style = abn_style;
 580                             p++;
 581                         }
 582                     }
 583                     col++;
 584                     break;
 585                 }
 586                 q++;
 587                 if ( cw > 1) {
 588                   q += cw - 1;
 589                 }
 590             }
 591         }
 592     } else {
 593         start_col_real = start_col = 0;
 594     }
 595     p->ch = 0;
 596
 597     print_to_widget (edit, row, start_col, start_col_real, end_col, line, line_stat);
 598 }
 599
 600 #define key_pending(x) (!is_idle())
 601
 602 static void edit_draw_this_char (WEdit * edit, long curs, long row)
 603 {
 604     int b = edit_bol (edit, curs);
 605     edit_draw_this_line (edit, b, row, 0, edit->num_widget_columns - 1);
 606 }
 607
 608 /* cursor must be in screen for other than REDRAW_PAGE passed in force */
 609 static void
 610 render_edit_text (WEdit * edit, long start_row, long start_column, long end_row,
 611                   long end_column)
 612 {
 613     long row = 0, curs_row;
 614     static int prev_curs_row = 0;
 615     static long prev_curs = 0;
 616
 617     int force = edit->force;
 618     long b;
 619
 620 /*
 621  * If the position of the page has not moved then we can draw the cursor
 622  * character only.  This will prevent line flicker when using arrow keys.
 623  */
 624     if ((!(force & REDRAW_CHAR_ONLY)) || (force & REDRAW_PAGE)) {
 625         if (!(force & REDRAW_IN_BOUNDS)) {      /* !REDRAW_IN_BOUNDS means to ignore bounds and redraw whole rows */
 626             start_row = 0;
 627             end_row = edit->num_widget_lines - 1;
 628             start_column = 0;
 629             end_column = edit->num_widget_columns - 1;
 630         }
 631         if (force & REDRAW_PAGE) {
 632             row = start_row;
 633             b = edit_move_forward (edit, edit->start_display, start_row, 0);
 634             while (row <= end_row) {
 635                 if (key_pending (edit))
 636                     goto exit_render;
 637                 edit_draw_this_line (edit, b, row, start_column, end_column);
 638                 b = edit_move_forward (edit, b, 1, 0);
 639                 row++;
 640             }
 641         } else {
 642             curs_row = edit->curs_row;
 643
 644             if (force & REDRAW_BEFORE_CURSOR) {
 645                 if (start_row < curs_row) {
 646                     long upto = curs_row - 1 <= end_row ? curs_row - 1 : end_row;
 647                     row = start_row;
 648                     b = edit->start_display;
 649                     while (row <= upto) {
 650                         if (key_pending (edit))
 651                             goto exit_render;
 652                         edit_draw_this_line (edit, b, row, start_column, end_column);
 653                         b = edit_move_forward (edit, b, 1, 0);
 654                     }
 655                 }
 656             }
 657 /*          if (force & REDRAW_LINE)          ---> default */
 658             b = edit_bol (edit, edit->curs1);
 659             if (curs_row >= start_row && curs_row <= end_row) {
 660                 if (key_pending (edit))
 661                     goto exit_render;
 662                 edit_draw_this_line (edit, b, curs_row, start_column, end_column);
 663             }
 664             if (force & REDRAW_AFTER_CURSOR) {
 665                 if (end_row > curs_row) {
 666                     row = curs_row + 1 < start_row ? start_row : curs_row + 1;
 667                     b = edit_move_forward (edit, b, 1, 0);
 668                     while (row <= end_row) {
 669                         if (key_pending (edit))
 670                             goto exit_render;
 671                         edit_draw_this_line (edit, b, row, start_column, end_column);
 672                         b = edit_move_forward (edit, b, 1, 0);
 673                         row++;
 674                     }
 675                 }
 676             }
 677             if (force & REDRAW_LINE_ABOVE && curs_row >= 1) {
 678                 row = curs_row - 1;
 679                 b = edit_move_backward (edit, edit_bol (edit, edit->curs1), 1);
 680                 if (row >= start_row && row <= end_row) {
 681                     if (key_pending (edit))
 682                         goto exit_render;
 683                     edit_draw_this_line (edit, b, row, start_column, end_column);
 684                 }
 685             }
 686             if (force & REDRAW_LINE_BELOW && row < edit->num_widget_lines - 1) {
 687                 row = curs_row + 1;
 688                 b = edit_bol (edit, edit->curs1);
 689                 b = edit_move_forward (edit, b, 1, 0);
 690                 if (row >= start_row && row <= end_row) {
 691                     if (key_pending (edit))
 692                         goto exit_render;
 693                     edit_draw_this_line (edit, b, row, start_column, end_column);
 694                 }
 695             }
 696         }
 697     } else {
 698         if (prev_curs_row < edit->curs_row) {   /* with the new text highlighting, we must draw from the top down */
 699             edit_draw_this_char (edit, prev_curs, prev_curs_row);
 700             edit_draw_this_char (edit, edit->curs1, edit->curs_row);
 701         } else {
 702             edit_draw_this_char (edit, edit->curs1, edit->curs_row);
 703             edit_draw_this_char (edit, prev_curs, prev_curs_row);
 704         }
 705     }
 706
 707     edit->force = 0;
 708
 709     prev_curs_row = edit->curs_row;
 710     prev_curs = edit->curs1;
 711
 712   exit_render:
 713     edit->screen_modified = 0;
 714     return;
 715 }
 716
 717 static void
 718 edit_render (WEdit * edit, int page, int row_start, int col_start, int row_end, int col_end)
 719 {
 720     if (page)                   /* if it was an expose event, 'page' would be set */
 721         edit->force |= REDRAW_PAGE | REDRAW_IN_BOUNDS;
 722
 723     if (edit->force & REDRAW_COMPLETELY)
 724         buttonbar_redraw (find_buttonbar (edit->widget.parent));
 725     render_edit_text (edit, row_start, col_start, row_end, col_end);
 726     /*
 727      * edit->force != 0 means a key was pending and the redraw
 728      * was halted, so next time we must redraw everything in case stuff
 729      * was left undrawn from a previous key press.
 730      */
 731     if (edit->force)
 732         edit->force |= REDRAW_PAGE;
 733 }
 734
 735 void edit_render_keypress (WEdit * edit)
 736 {
 737     edit_render (edit, 0, 0, 0, 0, 0);
 738 }