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 inline void
  74 status_string (WEdit * edit, char *s, int w)
  75 {
  76     char byte_str[16];
  77     unsigned char cur_byte = 0;
  78     unsigned int cur_utf = 0;
  79     int cw = 1;
  80
  81     /*
  82      * If we are at the end of file, print <EOF>,
  83      * otherwise print the current character as is (if printable),
  84      * as decimal and as hex.
  85      */
  86     if (edit->curs1 < edit->last_byte) {
  87         if ( !edit->utf8 ) {
  88             cur_byte = edit_get_byte (edit, edit->curs1);
  89
  90             g_snprintf (byte_str, sizeof (byte_str), "%4d 0x%03X",
  91                         (int) cur_byte,
  92                         (unsigned) cur_byte);
  93         } else {
  94             cur_utf = edit_get_utf (edit, edit->curs1, &cw);
  95             if ( cw > 0 ) {
  96                 g_snprintf (byte_str, sizeof (byte_str), "%04d 0x%03X",
  97                             (unsigned) cur_utf,
  98                             (unsigned) cur_utf);
  99             } else {
 100                 cur_utf = edit_get_byte (edit, edit->curs1);
 101                 g_snprintf (byte_str, sizeof (byte_str), "%04d 0x%03X",
 102                             (int) cur_utf,
 103                             (unsigned) cur_utf);
 104             }
 105
 106         }
 107     } else {
 108         strcpy (byte_str, "<EOF>     ");
 109     }
 110
 111     /* The field lengths just prevent the status line from shortening too much */
 112     if (simple_statusbar)
 113         g_snprintf (s, w,
 114                         "%c%c%c%c %3ld %5ld/%ld %6ld/%ld %s %s",
 115                         edit->mark1 != edit->mark2 ? ( column_highlighting ? 'C' : 'B') : '-',
 116                         edit->modified ? 'M' : '-',
 117                         edit->macro_i < 0 ? '-' : 'R',
 118                         edit->overwrite == 0 ? '-' : 'O',
 119                         edit->curs_col + edit->over_col,
 120
 121                         edit->curs_line + 1,
 122                         edit->total_lines + 1,
 123
 124                         edit->curs1,
 125                         edit->last_byte,
 126                         byte_str,
 127
 128 #ifdef HAVE_CHARSET
 129                         source_codepage >= 0 ? get_codepage_id (source_codepage) : ""
 130 #else
 131                         ""
 132 #endif
 133                     );
 134     else
 135         g_snprintf (s, w,
 136                         "[%c%c%c%c] %2ld L:[%3ld+%2ld %3ld/%3ld] *(%-4ld/%4ldb) %s  %s",
 137                         edit->mark1 != edit->mark2 ? ( column_highlighting ? 'C' : 'B') : '-',
 138                         edit->modified ? 'M' : '-',
 139                         edit->macro_i < 0 ? '-' : 'R',
 140                         edit->overwrite == 0 ? '-' : 'O',
 141                         edit->curs_col + edit->over_col,
 142
 143                         edit->start_line + 1,
 144                         edit->curs_row,
 145                         edit->curs_line + 1,
 146                         edit->total_lines + 1,
 147
 148                         edit->curs1,
 149                         edit->last_byte,
 150                         byte_str,
 151
 152 #ifdef HAVE_CHARSET
 153                         source_codepage >= 0 ? get_codepage_id (source_codepage) : ""
 154 #else
 155                         ""
 156 #endif
 157                     );
 158 }
 159
 160 static inline void
 161 printwstr (const char *s, int len)
 162 {
 163     if (len > 0)
 164         tty_printf ("%-*.*s", len, len, s);
 165 }
 166
 167 /* Draw the status line at the top of the widget. The size of the filename
 168  * field varies depending on the width of the screen and the length of
 169  * the filename. */
 170 void
 171 edit_status (WEdit *edit)
 172 {
 173     const int w = edit->widget.cols;
 174     const size_t status_size = w + 1;
 175     char * const status = g_malloc (status_size);
 176     int status_len;
 177     const char *fname = "";
 178     int fname_len;
 179     const int gap = 3; /* between the filename and the status */
 180     const int right_gap = 5; /* at the right end of the screen */
 181     const int preferred_fname_len = 16;
 182
 183     status_string (edit, status, status_size);
 184     status_len = (int) str_term_width1 (status);
 185
 186     if (edit->filename)
 187         fname = edit->filename;
 188     fname_len = str_term_width1 (fname);
 189     if (fname_len < preferred_fname_len)
 190         fname_len = preferred_fname_len;
 191
 192     if (fname_len + gap + status_len + right_gap >= w) {
 193         if (preferred_fname_len + gap + status_len + right_gap >= w)
 194             fname_len = preferred_fname_len;
 195         else
 196             fname_len = w - (gap + status_len + right_gap);
 197         fname = str_trunc (fname, fname_len);
 198     }
 199
 200     widget_move (edit, 0, 0);
 201     tty_setcolor (SELECTED_COLOR);
 202     printwstr (fname, fname_len + gap);
 203     printwstr (status, w - (fname_len + gap));
 204
 205     if (simple_statusbar && edit->widget.cols > 30) {
 206         size_t percent;
 207         if (edit->total_lines + 1 != 0)
 208             percent = (edit->curs_line + 1) * 100 / (edit->total_lines + 1);
 209         else
 210             percent = 100;
 211         widget_move (edit, 0, edit->widget.cols - 5);
 212         tty_printf (" %3d%%", percent);
 213     }
 214     tty_setcolor (EDITOR_NORMAL_COLOR);
 215
 216     g_free (status);
 217 }
 218
 219 /* this scrolls the text so that cursor is on the screen */
 220 void edit_scroll_screen_over_cursor (WEdit * edit)
 221 {
 222     int p;
 223     int outby;
 224     int b_extreme, t_extreme, l_extreme, r_extreme;
 225
 226     if (edit->num_widget_lines <= 0 || edit->num_widget_columns <= 0)
 227         return;
 228
 229     edit->num_widget_columns -= EDIT_TEXT_HORIZONTAL_OFFSET + option_line_state_width;
 230     edit->num_widget_lines -= EDIT_TEXT_VERTICAL_OFFSET - 1;
 231
 232     r_extreme = EDIT_RIGHT_EXTREME;
 233     l_extreme = EDIT_LEFT_EXTREME;
 234     b_extreme = EDIT_BOTTOM_EXTREME;
 235     t_extreme = EDIT_TOP_EXTREME;
 236     if (edit->found_len) {
 237         b_extreme = max (edit->num_widget_lines / 4, b_extreme);
 238         t_extreme = max (edit->num_widget_lines / 4, t_extreme);
 239     }
 240     if (b_extreme + t_extreme + 1 > edit->num_widget_lines) {
 241         int n;
 242         n = b_extreme + t_extreme;
 243         b_extreme = (b_extreme * (edit->num_widget_lines - 1)) / n;
 244         t_extreme = (t_extreme * (edit->num_widget_lines - 1)) / n;
 245     }
 246     if (l_extreme + r_extreme + 1 > edit->num_widget_columns) {
 247         int n;
 248         n = l_extreme + t_extreme;
 249         l_extreme = (l_extreme * (edit->num_widget_columns - 1)) / n;
 250         r_extreme = (r_extreme * (edit->num_widget_columns - 1)) / n;
 251     }
 252     p = edit_get_col (edit) + edit->over_col;
 253     edit_update_curs_row (edit);
 254     outby = p + edit->start_col - edit->num_widget_columns + 1 + (r_extreme + edit->found_len);
 255     if (outby > 0)
 256         edit_scroll_right (edit, outby);
 257     outby = l_extreme - p - edit->start_col;
 258     if (outby > 0)
 259         edit_scroll_left (edit, outby);
 260     p = edit->curs_row;
 261     outby = p - edit->num_widget_lines + 1 + b_extreme;
 262     if (outby > 0)
 263         edit_scroll_downward (edit, outby);
 264     outby = t_extreme - p;
 265     if (outby > 0)
 266         edit_scroll_upward (edit, outby);
 267     edit_update_curs_row (edit);
 268
 269     edit->num_widget_lines += EDIT_TEXT_VERTICAL_OFFSET - 1;
 270     edit->num_widget_columns += EDIT_TEXT_HORIZONTAL_OFFSET + option_line_state_width;
 271 }
 272
 273 #define edit_move(x,y) widget_move(edit, y, x);
 274
 275 struct line_s {
 276     unsigned int ch;
 277     unsigned int style;
 278 };
 279
 280 static inline void
 281 print_to_widget (WEdit *edit, long row, int start_col, int start_col_real,
 282                  long end_col, struct line_s line[], char *status)
 283 {
 284     struct line_s *p;
 285
 286     int x = start_col_real;
 287     int x1 = start_col + EDIT_TEXT_HORIZONTAL_OFFSET + option_line_state_width;
 288     int y = row + EDIT_TEXT_VERTICAL_OFFSET;
 289     int cols_to_skip = abs (x);
 290
 291     tty_setcolor (EDITOR_NORMAL_COLOR);
 292     tty_draw_hline (edit->widget.y + y, edit->widget.x + x1,
 293                     ' ', end_col + 1 - start_col);
 294
 295     if (option_line_state) {
 296         int i;
 297         for (i = 0; i < LINE_STATE_WIDTH; i++)
 298             if (status[i] == '\0')
 299                 status[i] = ' ';
 300
 301         tty_setcolor (LINE_STATE_COLOR);
 302         edit_move (x1 + FONT_OFFSET_X - option_line_state_width, y + FONT_OFFSET_Y);
 303         tty_print_string (status);
 304     }
 305
 306     edit_move (x1 + FONT_OFFSET_X, y + FONT_OFFSET_Y);
 307     p = line;
 308
 309     while (p->ch) {
 310         int style;
 311         unsigned int textchar;
 312         int color;
 313
 314         if (cols_to_skip) {
 315             p++;
 316             cols_to_skip--;
 317             continue;
 318         }
 319
 320         style = p->style & 0xFF00;
 321         textchar = p->ch;
 322         color = p->style >> 16;
 323
 324         if (style & MOD_ABNORMAL) {
 325             /* Non-printable - use black background */
 326             color = 0;
 327         }
 328
 329         if (style & MOD_WHITESPACE) {
 330             if (style & MOD_MARKED) {
 331                 textchar = ' ';
 332                 tty_setcolor (EDITOR_MARKED_COLOR);
 333             } else {
 334 #if 0
 335                 if (color != EDITOR_NORMAL_COLOR) {
 336                     textchar = ' ';
 337                     tty_lowlevel_setcolor (color);
 338                 } else
 339 #endif
 340                     tty_setcolor (EDITOR_WHITESPACE_COLOR);
 341             }
 342         } else {
 343             if (style & MOD_BOLD) {
 344                 tty_setcolor (EDITOR_BOLD_COLOR);
 345             } else if (style & MOD_MARKED) {
 346                 tty_setcolor (EDITOR_MARKED_COLOR);
 347             } else {
 348                 tty_lowlevel_setcolor (color);
 349             }
 350         }
 351         tty_print_anychar (textchar);
 352         p++;
 353     }
 354 }
 355
 356 int visible_tabs = 1, visible_tws = 1;
 357
 358 /* b is a pointer to the beginning of the line */
 359 static void
 360 edit_draw_this_line (WEdit *edit, long b, long row, long start_col,
 361                      long end_col)
 362 {
 363     struct line_s line[MAX_LINE_LEN];
 364     struct line_s *p = line;
 365
 366     long m1 = 0, m2 = 0, q, c1, c2;
 367     int col, start_col_real;
 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                 int cw = 1;
 425
 426                 p->ch = 0;
 427                 p->style = 0;
 428                 if (q == edit->curs1)
 429                     p->style |= MOD_CURSOR;
 430                 if (q >= m1 && q < m2) {
 431                     if (column_highlighting) {
 432                         int x;
 433                         x = edit_move_forward3 (edit, b, 0, q);
 434                         c1 = min (edit->column1, edit->column2);
 435                         c2 = max (edit->column1, edit->column2);
 436                         if (x >= c1 && x < c2)
 437                             p->style |= MOD_MARKED;
 438                     } else
 439                         p->style |= MOD_MARKED;
 440                 }
 441                 if (q == edit->bracket)
 442                     p->style |= MOD_BOLD;
 443                 if (q >= edit->found_start
 444                     && q < edit->found_start + edit->found_len)
 445                     p->style |= MOD_BOLD;
 446
 447                 if ( !edit->utf8 ) {
 448                     c = edit_get_byte (edit, q);
 449                 } else {
 450                     c = edit_get_utf (edit, q, &cw);
 451                 }
 452                 /* we don't use bg for mc - fg contains both */
 453                 if (book_mark) {
 454                     p->style |= book_mark << 16;
 455                 } else {
 456                     edit_get_syntax_color (edit, q, &color);
 457                     p->style |= color << 16;
 458                 }
 459                 switch (c) {
 460                 case '\n':
 461                     col = (end_col + utf8lag) - edit->start_col + 1;    /* quit */
 462                     break;
 463                 case '\t':
 464                     i = TAB_SIZE - ((int) col % TAB_SIZE);
 465                     col += i;
 466                     if (tty_use_colors() &&
 467                        ((visible_tabs || (visible_tws && q >= tws)) && enable_show_tabs_tws)) {
 468                         if (p->style & MOD_MARKED)
 469                             c = p->style;
 470                         else if (book_mark)
 471                             c |= book_mark << 16;
 472                         else
 473                             c = p->style | MOD_WHITESPACE;
 474                         if (i > 2) {
 475                             p->ch = '<';
 476                             p->style = c;
 477                             p++;
 478                             while (--i > 1) {
 479                                 p->ch = '-';
 480                                 p->style = c;
 481                                 p++;
 482                             }
 483                             p->ch = '>';
 484                             p->style = c;
 485                             p++;
 486                         } else if (i > 1) {
 487                             p->ch = '<';
 488                             p->style = c;
 489                             p++;
 490                             p->ch = '>';
 491                             p->style = c;
 492                             p++;
 493                         } else {
 494                             p->ch = '>';
 495                             p->style = c;
 496                             p++;
 497                         }
 498                     } else if (tty_use_colors() && visible_tws && q >= tws && enable_show_tabs_tws) {
 499                         p->ch = '.';
 500                         p->style |= MOD_WHITESPACE;
 501                         c = p->style & ~MOD_CURSOR;
 502                         p++;
 503                         while (--i) {
 504                             p->ch = ' ';
 505                             p->style = c;
 506                             p++;
 507                         }
 508                     } else {
 509                         p->ch |= ' ';
 510                         c = p->style & ~MOD_CURSOR;
 511                         p++;
 512                         while (--i) {
 513                             p->ch = ' ';
 514                             p->style = c;
 515                             p++;
 516                         }
 517                     }
 518                     break;
 519                 case ' ':
 520                     if (tty_use_colors() && visible_tws && q >= tws && enable_show_tabs_tws) {
 521                         p->ch = '.';
 522                         p->style |= MOD_WHITESPACE;
 523                         p++;
 524                         col++;
 525                         break;
 526                     }
 527                     /* fallthrough */
 528                 default:
 529 #ifdef HAVE_CHARSET
 530                     if ( utf8_display ) {
 531                         if ( !edit->utf8 ) {
 532                             c = convert_from_8bit_to_utf_c ((unsigned char) c, edit->converter);
 533                         }
 534                     } else if ( edit->utf8 )
 535                         c = convert_from_utf_to_current_c (c, edit->converter);
 536                     else
 537 #endif
 538                         c = convert_to_display_c (c);
 539
 540                     /* Caret notation for control characters */
 541                     if (c < 32) {
 542                         p->ch = '^';
 543                         p->style = abn_style;
 544                         p++;
 545                         p->ch = c + 0x40;
 546                         p->style = abn_style;
 547                         p++;
 548                         col += 2;
 549                         break;
 550                     }
 551                     if (c == 127) {
 552                         p->ch = '^';
 553                         p->style = abn_style;
 554                         p++;
 555                         p->ch = '?';
 556                         p->style = abn_style;
 557                         p++;
 558                         col += 2;
 559                         break;
 560                     }
 561                     if (!edit->utf8) {
 562                         if ( ( utf8_display && g_unichar_isprint (c) ) ||
 563                              ( !utf8_display && is_printable (c) ) ) {
 564                                 p->ch = c;
 565                                 p++;
 566                         } else {
 567                                 p->ch = '.';
 568                                 p->style = abn_style;
 569                                 p++;
 570                         }
 571                     } else {
 572                         if ( g_unichar_isprint (c) ) {
 573                             p->ch = c;
 574                             p++;
 575                         } else {
 576                             p->ch = '.';
 577                             p->style = abn_style;
 578                             p++;
 579                         }
 580                     }
 581                     col++;
 582                     break;
 583                 } /* case */
 584
 585                 q++;
 586                 if ( cw > 1) {
 587                   q += cw - 1;
 588                 }
 589             }
 590         }
 591     } else {
 592         start_col_real = start_col = 0;
 593     }
 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 inline void
 603 edit_draw_this_char (WEdit * edit, long curs, long row)
 604 {
 605     int b = edit_bol (edit, curs);
 606     edit_draw_this_line (edit, b, row, 0, edit->num_widget_columns - 1);
 607 }
 608
 609 /* cursor must be in screen for other than REDRAW_PAGE passed in force */
 610 static inline void
 611 render_edit_text (WEdit * edit, long start_row, long start_column, long end_row,
 612                   long end_column)
 613 {
 614     long row = 0, curs_row;
 615     static long prev_curs_row = 0;
 616     static long prev_curs = 0;
 617
 618     int force = edit->force;
 619     long b;
 620
 621 /*
 622  * If the position of the page has not moved then we can draw the cursor
 623  * character only.  This will prevent line flicker when using arrow keys.
 624  */
 625     if ((!(force & REDRAW_CHAR_ONLY)) || (force & REDRAW_PAGE)) {
 626         if (!(force & REDRAW_IN_BOUNDS)) {      /* !REDRAW_IN_BOUNDS means to ignore bounds and redraw whole rows */
 627             start_row = 0;
 628             end_row = edit->num_widget_lines - 1;
 629             start_column = 0;
 630             end_column = edit->num_widget_columns - 1;
 631         }
 632         if (force & REDRAW_PAGE) {
 633             row = start_row;
 634             b = edit_move_forward (edit, edit->start_display, start_row, 0);
 635             while (row <= end_row) {
 636                 if (key_pending (edit))
 637                     goto exit_render;
 638                 edit_draw_this_line (edit, b, row, start_column, end_column);
 639                 b = edit_move_forward (edit, b, 1, 0);
 640                 row++;
 641             }
 642         } else {
 643             curs_row = edit->curs_row;
 644
 645             if (force & REDRAW_BEFORE_CURSOR) {
 646                 if (start_row < curs_row) {
 647                     long upto = curs_row - 1 <= end_row ? curs_row - 1 : end_row;
 648                     row = start_row;
 649                     b = edit->start_display;
 650                     while (row <= upto) {
 651                         if (key_pending (edit))
 652                             goto exit_render;
 653                         edit_draw_this_line (edit, b, row, start_column, end_column);
 654                         b = edit_move_forward (edit, b, 1, 0);
 655                     }
 656                 }
 657             }
 658 /*          if (force & REDRAW_LINE)          ---> default */
 659             b = edit_bol (edit, edit->curs1);
 660             if (curs_row >= start_row && curs_row <= end_row) {
 661                 if (key_pending (edit))
 662                     goto exit_render;
 663                 edit_draw_this_line (edit, b, curs_row, start_column, end_column);
 664             }
 665             if (force & REDRAW_AFTER_CURSOR) {
 666                 if (end_row > curs_row) {
 667                     row = curs_row + 1 < start_row ? start_row : curs_row + 1;
 668                     b = edit_move_forward (edit, b, 1, 0);
 669                     while (row <= end_row) {
 670                         if (key_pending (edit))
 671                             goto exit_render;
 672                         edit_draw_this_line (edit, b, row, start_column, end_column);
 673                         b = edit_move_forward (edit, b, 1, 0);
 674                         row++;
 675                     }
 676                 }
 677             }
 678             if (force & REDRAW_LINE_ABOVE && curs_row >= 1) {
 679                 row = curs_row - 1;
 680                 b = edit_move_backward (edit, edit_bol (edit, edit->curs1), 1);
 681                 if (row >= start_row && row <= end_row) {
 682                     if (key_pending (edit))
 683                         goto exit_render;
 684                     edit_draw_this_line (edit, b, row, start_column, end_column);
 685                 }
 686             }
 687             if (force & REDRAW_LINE_BELOW && row < edit->num_widget_lines - 1) {
 688                 row = curs_row + 1;
 689                 b = edit_bol (edit, edit->curs1);
 690                 b = edit_move_forward (edit, b, 1, 0);
 691                 if (row >= start_row && row <= end_row) {
 692                     if (key_pending (edit))
 693                         goto exit_render;
 694                     edit_draw_this_line (edit, b, row, start_column, end_column);
 695                 }
 696             }
 697         }
 698     } else {
 699         if (prev_curs_row < edit->curs_row) {   /* with the new text highlighting, we must draw from the top down */
 700             edit_draw_this_char (edit, prev_curs, prev_curs_row);
 701             edit_draw_this_char (edit, edit->curs1, edit->curs_row);
 702         } else {
 703             edit_draw_this_char (edit, edit->curs1, edit->curs_row);
 704             edit_draw_this_char (edit, prev_curs, prev_curs_row);
 705         }
 706     }
 707
 708     edit->force = 0;
 709
 710     prev_curs_row = edit->curs_row;
 711     prev_curs = edit->curs1;
 712
 713   exit_render:
 714     edit->screen_modified = 0;
 715 }
 716
 717 static inline 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 }