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] %2ld %3ld/%3ld (%-4ld/%4ldb)= %s  cp:%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,
 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,
 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 = 2; /* 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     tty_setcolor (EDITOR_NORMAL_COLOR);
 204
 205     g_free (status);
 206 }
 207
 208 /* this scrolls the text so that cursor is on the screen */
 209 void edit_scroll_screen_over_cursor (WEdit * edit)
 210 {
 211     int p;
 212     int outby;
 213     int b_extreme, t_extreme, l_extreme, r_extreme;
 214
 215     if (edit->num_widget_lines <= 0 || edit->num_widget_columns <= 0)
 216         return;
 217
 218     edit->num_widget_columns -= EDIT_TEXT_HORIZONTAL_OFFSET + option_line_state_width;
 219     edit->num_widget_lines -= EDIT_TEXT_VERTICAL_OFFSET - 1;
 220
 221     r_extreme = EDIT_RIGHT_EXTREME;
 222     l_extreme = EDIT_LEFT_EXTREME;
 223     b_extreme = EDIT_BOTTOM_EXTREME;
 224     t_extreme = EDIT_TOP_EXTREME;
 225     if (edit->found_len) {
 226         b_extreme = max (edit->num_widget_lines / 4, b_extreme);
 227         t_extreme = max (edit->num_widget_lines / 4, t_extreme);
 228     }
 229     if (b_extreme + t_extreme + 1 > edit->num_widget_lines) {
 230         int n;
 231         n = b_extreme + t_extreme;
 232         b_extreme = (b_extreme * (edit->num_widget_lines - 1)) / n;
 233         t_extreme = (t_extreme * (edit->num_widget_lines - 1)) / n;
 234     }
 235     if (l_extreme + r_extreme + 1 > edit->num_widget_columns) {
 236         int n;
 237         n = l_extreme + t_extreme;
 238         l_extreme = (l_extreme * (edit->num_widget_columns - 1)) / n;
 239         r_extreme = (r_extreme * (edit->num_widget_columns - 1)) / n;
 240     }
 241     p = edit_get_col (edit) + edit->over_col;
 242     edit_update_curs_row (edit);
 243     outby = p + edit->start_col - edit->num_widget_columns + 1 + (r_extreme + edit->found_len);
 244     if (outby > 0)
 245         edit_scroll_right (edit, outby);
 246     outby = l_extreme - p - edit->start_col;
 247     if (outby > 0)
 248         edit_scroll_left (edit, outby);
 249     p = edit->curs_row;
 250     outby = p - edit->num_widget_lines + 1 + b_extreme;
 251     if (outby > 0)
 252         edit_scroll_downward (edit, outby);
 253     outby = t_extreme - p;
 254     if (outby > 0)
 255         edit_scroll_upward (edit, outby);
 256     edit_update_curs_row (edit);
 257
 258     edit->num_widget_lines += EDIT_TEXT_VERTICAL_OFFSET - 1;
 259     edit->num_widget_columns += EDIT_TEXT_HORIZONTAL_OFFSET + option_line_state_width;
 260 }
 261
 262 #define edit_move(x,y) widget_move(edit, y, x);
 263
 264 struct line_s {
 265     unsigned int ch;
 266     unsigned int style;
 267 };
 268
 269 static void
 270 print_to_widget (WEdit *edit, long row, int start_col, int start_col_real,
 271                  long end_col, struct line_s line[], char *status)
 272 {
 273     struct line_s *p;
 274
 275     int x = start_col_real;
 276     int x1 = start_col + EDIT_TEXT_HORIZONTAL_OFFSET + option_line_state_width;
 277     int y = row + EDIT_TEXT_VERTICAL_OFFSET;
 278     int cols_to_skip = abs (x);
 279
 280     tty_setcolor (EDITOR_NORMAL_COLOR);
 281     tty_draw_hline (edit->widget.y + y, edit->widget.x + x1,
 282                     ' ', end_col + 1 - start_col);
 283
 284     if (option_line_state) {
 285         int i;
 286         for (i = 0; i < LINE_STATE_WIDTH; i++)
 287             if (status[i] == '\0')
 288                 status[i] = ' ';
 289
 290         tty_setcolor (LINE_STATE_COLOR);
 291         edit_move (x1 + FONT_OFFSET_X - option_line_state_width, y + FONT_OFFSET_Y);
 292         tty_print_string (status);
 293     }
 294
 295     edit_move (x1 + FONT_OFFSET_X, y + FONT_OFFSET_Y);
 296     p = line;
 297
 298     while (p->ch) {
 299         int style;
 300         unsigned int textchar;
 301         int color;
 302
 303         if (cols_to_skip) {
 304             p++;
 305             cols_to_skip--;
 306             continue;
 307         }
 308
 309         style = p->style & 0xFF00;
 310         textchar = p->ch;
 311         color = p->style >> 16;
 312
 313         if (style & MOD_ABNORMAL) {
 314             /* Non-printable - use black background */
 315             color = 0;
 316         }
 317
 318         if (style & MOD_WHITESPACE) {
 319             if (style & MOD_MARKED) {
 320                 textchar = ' ';
 321                 tty_setcolor (EDITOR_MARKED_COLOR);
 322             } else {
 323 #if 0
 324                 if (color != EDITOR_NORMAL_COLOR) {
 325                     textchar = ' ';
 326                     tty_lowlevel_setcolor (color);
 327                 } else
 328 #endif
 329                     tty_setcolor (EDITOR_WHITESPACE_COLOR);
 330             }
 331         } else {
 332             if (style & MOD_BOLD) {
 333                 tty_setcolor (EDITOR_BOLD_COLOR);
 334             } else if (style & MOD_MARKED) {
 335                 tty_setcolor (EDITOR_MARKED_COLOR);
 336             } else {
 337                 tty_lowlevel_setcolor (color);
 338             }
 339         }
 340         tty_print_anychar (textchar);
 341         p++;
 342     }
 343 }
 344
 345 int visible_tabs = 1, visible_tws = 1;
 346
 347 /* b is a pointer to the beginning of the line */
 348 static void
 349 edit_draw_this_line (WEdit *edit, long b, long row, long start_col,
 350                      long end_col)
 351 {
 352     struct line_s line[MAX_LINE_LEN];
 353     struct line_s *p = line;
 354
 355     long m1 = 0, m2 = 0, q, c1, c2;
 356     int col, start_col_real;
 357     int cw;
 358     unsigned int c;
 359     int color;
 360     int abn_style;
 361     int i;
 362     int utf8lag = 0;
 363     unsigned int cur_line = 0;
 364     int book_mark = 0;
 365     char line_stat[LINE_STATE_WIDTH + 1];
 366
 367     if (row > edit->num_widget_lines - EDIT_TEXT_VERTICAL_OFFSET) {
 368          return;
 369     }
 370     if (book_mark_query_color(edit, edit->start_line + row, BOOK_MARK_COLOR)) {
 371         book_mark = BOOK_MARK_COLOR;
 372     } else if (book_mark_query_color(edit, edit->start_line + row, BOOK_MARK_FOUND_COLOR)) {
 373         book_mark = BOOK_MARK_FOUND_COLOR;
 374     }
 375
 376     if (book_mark)
 377         abn_style = book_mark << 16;
 378     else
 379         abn_style = MOD_ABNORMAL;
 380
 381     end_col -= EDIT_TEXT_HORIZONTAL_OFFSET + option_line_state_width;
 382
 383     edit_get_syntax_color (edit, b - 1, &color);
 384     q = edit_move_forward3 (edit, b, start_col - edit->start_col, 0);
 385     start_col_real = (col =
 386                       (int) edit_move_forward3 (edit, b, 0,
 387                                                 q)) + edit->start_col;
 388     if ( option_line_state ) {
 389         cur_line = edit->start_line + row;
 390         if ( cur_line <= edit->total_lines ) {
 391             g_snprintf (line_stat, LINE_STATE_WIDTH + 1, "%7i ", cur_line + 1);
 392         } else {
 393             memset(line_stat, ' ', LINE_STATE_WIDTH);
 394             line_stat[LINE_STATE_WIDTH] = '\0';
 395         }
 396         if (book_mark_query_color (edit, cur_line, BOOK_MARK_COLOR)){
 397             g_snprintf (line_stat, 2, "*");
 398         }
 399     }
 400
 401     if (col + 16 > -edit->start_col) {
 402         eval_marks (edit, &m1, &m2);
 403
 404         if (row <= edit->total_lines - edit->start_line) {
 405                 long tws = 0;
 406             if (tty_use_colors () && visible_tws) {
 407                 tws = edit_eol (edit, b);
 408                 while (tws > b && ((c = edit_get_byte (edit, tws - 1)) == ' '
 409                                    || c == '\t'))
 410                     tws--;
 411             }
 412
 413             while (col <= end_col - edit->start_col) {
 414                 p->ch = 0;
 415                 p->style = 0;
 416                 if (q == edit->curs1)
 417                     p->style |= MOD_CURSOR;
 418                 if (q >= m1 && q < m2) {
 419                     if (column_highlighting) {
 420                         int x;
 421                         x = edit_move_forward3 (edit, b, 0, q);
 422                         c1 = min (edit->column1, edit->column2);
 423                         c2 = max (edit->column1, edit->column2);
 424                         if (x >= c1 && x < c2)
 425                             p->style |= MOD_MARKED;
 426                     } else
 427                         p->style |= MOD_MARKED;
 428                 }
 429                 if (q == edit->bracket)
 430                     p->style |= MOD_BOLD;
 431                 if (q >= edit->found_start
 432                     && q < edit->found_start + edit->found_len)
 433                     p->style |= MOD_BOLD;
 434                 cw = 1;
 435                 if ( !edit->utf8 ) {
 436                     c = edit_get_byte (edit, q);
 437                 } else {
 438                     c = edit_get_utf (edit, q, &cw);
 439                 }
 440                 /* we don't use bg for mc - fg contains both */
 441                 if (book_mark) {
 442                     p->style |= book_mark << 16;
 443                 } else {
 444                     edit_get_syntax_color (edit, q, &color);
 445                     p->style |= color << 16;
 446                 }
 447                 switch (c) {
 448                 case '\n':
 449                     col = (end_col + utf8lag) - edit->start_col + 1;    /* quit */
 450                     break;
 451                 case '\t':
 452                     i = TAB_SIZE - ((int) col % TAB_SIZE);
 453                     col += i;
 454                     if (tty_use_colors() &&
 455                        ((visible_tabs || (visible_tws && q >= tws)) && enable_show_tabs_tws)) {
 456                         if (p->style & MOD_MARKED)
 457                             c = p->style;
 458                         else if (book_mark)
 459                             c |= book_mark << 16;
 460                         else
 461                             c = p->style | MOD_WHITESPACE;
 462                         if (i > 2) {
 463                             p->ch = '<';
 464                             p->style = c;
 465                             p++;
 466                             while (--i > 1) {
 467                                 p->ch = '-';
 468                                 p->style = c;
 469                                 p++;
 470                             }
 471                             p->ch = '>';
 472                             p->style = c;
 473                             p++;
 474                         } else if (i > 1) {
 475                             p->ch = '<';
 476                             p->style = c;
 477                             p++;
 478                             p->ch = '>';
 479                             p->style = c;
 480                             p++;
 481                         } else {
 482                             p->ch = '>';
 483                             p->style = c;
 484                             p++;
 485                         }
 486                     } else if (tty_use_colors() && visible_tws && q >= tws && enable_show_tabs_tws) {
 487                         p->ch = '.';
 488                         p->style |= MOD_WHITESPACE;
 489                         c = p->style & ~MOD_CURSOR;
 490                         p++;
 491                         while (--i) {
 492                             p->ch = ' ';
 493                             p->style = c;
 494                             p++;
 495                         }
 496                     } else {
 497                         p->ch |= ' ';
 498                         c = p->style & ~MOD_CURSOR;
 499                         p++;
 500                         while (--i) {
 501                             p->ch = ' ';
 502                             p->style = c;
 503                             p++;
 504                         }
 505                     }
 506                     break;
 507                 case ' ':
 508                     if (tty_use_colors() && visible_tws && q >= tws && enable_show_tabs_tws) {
 509                         p->ch = '.';
 510                         p->style |= MOD_WHITESPACE;
 511                         p++;
 512                         col++;
 513                         break;
 514                     }
 515                     /* fallthrough */
 516                 default:
 517 #ifdef HAVE_CHARSET
 518                     if ( utf8_display ) {
 519                         if ( !edit->utf8 ) {
 520                             c = convert_from_8bit_to_utf_c ((unsigned char) c, edit->converter);
 521                         }
 522                     } else {
 523                         if ( edit->utf8 ) {
 524                             c = convert_from_utf_to_current_c (c, edit->converter);
 525                         } else {
 526 #endif
 527                             c = convert_to_display_c (c);
 528 #ifdef HAVE_CHARSET
 529                         }
 530                     }
 531 #endif
 532                     /* Caret notation for control characters */
 533                     if (c < 32) {
 534                         p->ch = '^';
 535                         p->style = abn_style;
 536                         p++;
 537                         p->ch = c + 0x40;
 538                         p->style = abn_style;
 539                         p++;
 540                         col += 2;
 541                         break;
 542                     }
 543                     if (c == 127) {
 544                         p->ch = '^';
 545                         p->style = abn_style;
 546                         p++;
 547                         p->ch = '?';
 548                         p->style = abn_style;
 549                         p++;
 550                         col += 2;
 551                         break;
 552                     }
 553 #ifndef HAVE_CHARSET
 554                     int utf8_display = 0;
 555 #endif
 556                     if (!edit->utf8) {
 557                         if ( ( utf8_display && g_unichar_isprint (c) ) ||
 558                              ( utf8_display == 0 && is_printable (c) ) ) {
 559                                 p->ch = c;
 560                                 p++;
 561                         } else {
 562                                 p->ch = '.';
 563                                 p->style = abn_style;
 564                                 p++;
 565                         }
 566                     } else {
 567                         if ( g_unichar_isprint (c) ) {
 568                             p->ch = c;
 569                             p++;
 570                         } else {
 571                             p->ch = '.';
 572                             p->style = abn_style;
 573                             p++;
 574                         }
 575                     }
 576                     col++;
 577                     break;
 578                 }
 579                 q++;
 580                 if ( cw > 1) {
 581                   q += cw - 1;
 582                 }
 583             }
 584         }
 585     } else {
 586         start_col_real = start_col = 0;
 587     }
 588     p->ch = 0;
 589
 590     print_to_widget (edit, row, start_col, start_col_real, end_col, line, line_stat);
 591 }
 592
 593 #define key_pending(x) (!is_idle())
 594
 595 static void edit_draw_this_char (WEdit * edit, long curs, long row)
 596 {
 597     int b = edit_bol (edit, curs);
 598     edit_draw_this_line (edit, b, row, 0, edit->num_widget_columns - 1);
 599 }
 600
 601 /* cursor must be in screen for other than REDRAW_PAGE passed in force */
 602 static void
 603 render_edit_text (WEdit * edit, long start_row, long start_column, long end_row,
 604                   long end_column)
 605 {
 606     long row = 0, curs_row;
 607     static int prev_curs_row = 0;
 608     static long prev_curs = 0;
 609
 610     int force = edit->force;
 611     long b;
 612
 613 /*
 614  * If the position of the page has not moved then we can draw the cursor
 615  * character only.  This will prevent line flicker when using arrow keys.
 616  */
 617     if ((!(force & REDRAW_CHAR_ONLY)) || (force & REDRAW_PAGE)) {
 618         if (!(force & REDRAW_IN_BOUNDS)) {      /* !REDRAW_IN_BOUNDS means to ignore bounds and redraw whole rows */
 619             start_row = 0;
 620             end_row = edit->num_widget_lines - 1;
 621             start_column = 0;
 622             end_column = edit->num_widget_columns - 1;
 623         }
 624         if (force & REDRAW_PAGE) {
 625             row = start_row;
 626             b = edit_move_forward (edit, edit->start_display, start_row, 0);
 627             while (row <= end_row) {
 628                 if (key_pending (edit))
 629                     goto exit_render;
 630                 edit_draw_this_line (edit, b, row, start_column, end_column);
 631                 b = edit_move_forward (edit, b, 1, 0);
 632                 row++;
 633             }
 634         } else {
 635             curs_row = edit->curs_row;
 636
 637             if (force & REDRAW_BEFORE_CURSOR) {
 638                 if (start_row < curs_row) {
 639                     long upto = curs_row - 1 <= end_row ? curs_row - 1 : end_row;
 640                     row = start_row;
 641                     b = edit->start_display;
 642                     while (row <= upto) {
 643                         if (key_pending (edit))
 644                             goto exit_render;
 645                         edit_draw_this_line (edit, b, row, start_column, end_column);
 646                         b = edit_move_forward (edit, b, 1, 0);
 647                     }
 648                 }
 649             }
 650 /*          if (force & REDRAW_LINE)          ---> default */
 651             b = edit_bol (edit, edit->curs1);
 652             if (curs_row >= start_row && curs_row <= end_row) {
 653                 if (key_pending (edit))
 654                     goto exit_render;
 655                 edit_draw_this_line (edit, b, curs_row, start_column, end_column);
 656             }
 657             if (force & REDRAW_AFTER_CURSOR) {
 658                 if (end_row > curs_row) {
 659                     row = curs_row + 1 < start_row ? start_row : curs_row + 1;
 660                     b = edit_move_forward (edit, b, 1, 0);
 661                     while (row <= end_row) {
 662                         if (key_pending (edit))
 663                             goto exit_render;
 664                         edit_draw_this_line (edit, b, row, start_column, end_column);
 665                         b = edit_move_forward (edit, b, 1, 0);
 666                         row++;
 667                     }
 668                 }
 669             }
 670             if (force & REDRAW_LINE_ABOVE && curs_row >= 1) {
 671                 row = curs_row - 1;
 672                 b = edit_move_backward (edit, edit_bol (edit, edit->curs1), 1);
 673                 if (row >= start_row && row <= end_row) {
 674                     if (key_pending (edit))
 675                         goto exit_render;
 676                     edit_draw_this_line (edit, b, row, start_column, end_column);
 677                 }
 678             }
 679             if (force & REDRAW_LINE_BELOW && row < edit->num_widget_lines - 1) {
 680                 row = curs_row + 1;
 681                 b = edit_bol (edit, edit->curs1);
 682                 b = edit_move_forward (edit, b, 1, 0);
 683                 if (row >= start_row && row <= end_row) {
 684                     if (key_pending (edit))
 685                         goto exit_render;
 686                     edit_draw_this_line (edit, b, row, start_column, end_column);
 687                 }
 688             }
 689         }
 690     } else {
 691         if (prev_curs_row < edit->curs_row) {   /* with the new text highlighting, we must draw from the top down */
 692             edit_draw_this_char (edit, prev_curs, prev_curs_row);
 693             edit_draw_this_char (edit, edit->curs1, edit->curs_row);
 694         } else {
 695             edit_draw_this_char (edit, edit->curs1, edit->curs_row);
 696             edit_draw_this_char (edit, prev_curs, prev_curs_row);
 697         }
 698     }
 699
 700     edit->force = 0;
 701
 702     prev_curs_row = edit->curs_row;
 703     prev_curs = edit->curs1;
 704
 705   exit_render:
 706     edit->screen_modified = 0;
 707     return;
 708 }
 709
 710 static void
 711 edit_render (WEdit * edit, int page, int row_start, int col_start, int row_end, int col_end)
 712 {
 713     if (page)                   /* if it was an expose event, 'page' would be set */
 714         edit->force |= REDRAW_PAGE | REDRAW_IN_BOUNDS;
 715
 716     if (edit->force & REDRAW_COMPLETELY)
 717         buttonbar_redraw (edit->widget.parent);
 718     render_edit_text (edit, row_start, col_start, row_end, col_end);
 719     /*
 720      * edit->force != 0 means a key was pending and the redraw
 721      * was halted, so next time we must redraw everything in case stuff
 722      * was left undrawn from a previous key press.
 723      */
 724     if (edit->force)
 725         edit->force |= REDRAW_PAGE;
 726 }
 727
 728 void edit_render_keypress (WEdit * edit)
 729 {
 730     edit_render (edit, 0, 0, 0, 0, 0);
 731 }