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/tty/color.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     unsigned char str[6 + 1];
 280
 281     tty_setcolor (EDITOR_NORMAL_COLOR);
 282     tty_draw_hline (edit->widget.y + y, edit->widget.x + x1,
 283                     ' ', end_col + 1 - start_col);
 284
 285     if (option_line_state) {
 286         int i;
 287         for (i = 0; i < LINE_STATE_WIDTH; i++)
 288             if (status[i] == '\0')
 289                 status[i] = ' ';
 290
 291         tty_setcolor (LINE_STATE_COLOR);
 292         edit_move (x1 + FONT_OFFSET_X - option_line_state_width, y + FONT_OFFSET_Y);
 293         tty_print_string (status);
 294     }
 295
 296     edit_move (x1 + FONT_OFFSET_X, y + FONT_OFFSET_Y);
 297     p = line;
 298
 299     while (p->ch) {
 300         int style;
 301         unsigned int textchar;
 302         int color;
 303
 304         if (cols_to_skip) {
 305             p++;
 306             cols_to_skip--;
 307             continue;
 308         }
 309
 310         style = p->style & 0xFF00;
 311         textchar = p->ch;
 312         color = p->style >> 16;
 313
 314         if (style & MOD_ABNORMAL) {
 315             /* Non-printable - use black background */
 316             color = 0;
 317         }
 318
 319         if (style & MOD_WHITESPACE) {
 320             if (style & MOD_MARKED) {
 321                 textchar = ' ';
 322                 tty_setcolor (EDITOR_MARKED_COLOR);
 323             } else {
 324 #if 0
 325                 if (color != EDITOR_NORMAL_COLOR) {
 326                     textchar = ' ';
 327                     tty_lowlevel_setcolor (color);
 328                 } else
 329 #endif
 330                     tty_setcolor (EDITOR_WHITESPACE_COLOR);
 331             }
 332         } else {
 333             if (style & MOD_BOLD) {
 334                 tty_setcolor (EDITOR_BOLD_COLOR);
 335             } else if (style & MOD_MARKED) {
 336                 tty_setcolor (EDITOR_MARKED_COLOR);
 337             } else {
 338                 tty_lowlevel_setcolor (color);
 339             }
 340         }
 341         tty_print_anychar (textchar);
 342         p++;
 343     }
 344 }
 345
 346 int visible_tabs = 1, visible_tws = 1;
 347
 348 /* b is a pointer to the beginning of the line */
 349 static void
 350 edit_draw_this_line (WEdit *edit, long b, long row, long start_col,
 351                      long end_col)
 352 {
 353     struct line_s line[MAX_LINE_LEN];
 354     struct line_s *p = line;
 355
 356     long m1 = 0, m2 = 0, q, c1, c2;
 357     int col, start_col_real;
 358     int cw;
 359     unsigned int c;
 360     int color;
 361     int abn_style;
 362     int i;
 363     int utf8lag = 0;
 364     unsigned int cur_line = 0;
 365     int book_mark = 0;
 366     char line_stat[LINE_STATE_WIDTH + 1];
 367
 368     if (row > edit->num_widget_lines - EDIT_TEXT_VERTICAL_OFFSET) {
 369          return;
 370     }
 371     if (book_mark_query_color(edit, edit->start_line + row, BOOK_MARK_COLOR)) {
 372         book_mark = BOOK_MARK_COLOR;
 373     } else if (book_mark_query_color(edit, edit->start_line + row, BOOK_MARK_FOUND_COLOR)) {
 374         book_mark = BOOK_MARK_FOUND_COLOR;
 375     }
 376
 377     if (book_mark)
 378         abn_style = book_mark << 16;
 379     else
 380         abn_style = MOD_ABNORMAL;
 381
 382     end_col -= EDIT_TEXT_HORIZONTAL_OFFSET + option_line_state_width;
 383
 384     edit_get_syntax_color (edit, b - 1, &color);
 385     q = edit_move_forward3 (edit, b, start_col - edit->start_col, 0);
 386     start_col_real = (col =
 387                       (int) edit_move_forward3 (edit, b, 0,
 388                                                 q)) + edit->start_col;
 389     if ( option_line_state ) {
 390         cur_line = edit->start_line + row;
 391         if ( cur_line <= edit->total_lines ) {
 392             g_snprintf (line_stat, LINE_STATE_WIDTH + 1, "%7i ", cur_line + 1);
 393         } else {
 394             memset(line_stat, ' ', LINE_STATE_WIDTH);
 395             line_stat[LINE_STATE_WIDTH] = '\0';
 396         }
 397         if (book_mark_query_color (edit, cur_line, BOOK_MARK_COLOR)){
 398             g_snprintf (line_stat, 2, "*");
 399         }
 400     }
 401
 402     if (col + 16 > -edit->start_col) {
 403         eval_marks (edit, &m1, &m2);
 404
 405         if (row <= edit->total_lines - edit->start_line) {
 406                 long tws = 0;
 407             if (tty_use_colors () && visible_tws) {
 408                 tws = edit_eol (edit, b);
 409                 while (tws > b && ((c = edit_get_byte (edit, tws - 1)) == ' '
 410                                    || c == '\t'))
 411                     tws--;
 412             }
 413
 414             while (col <= end_col - edit->start_col) {
 415                 p->ch = 0;
 416                 p->style = 0;
 417                 if (q == edit->curs1)
 418                     p->style |= MOD_CURSOR;
 419                 if (q >= m1 && q < m2) {
 420                     if (column_highlighting) {
 421                         int x;
 422                         x = edit_move_forward3 (edit, b, 0, q);
 423                         c1 = min (edit->column1, edit->column2);
 424                         c2 = max (edit->column1, edit->column2);
 425                         if (x >= c1 && x < c2)
 426                             p->style |= MOD_MARKED;
 427                     } else
 428                         p->style |= MOD_MARKED;
 429                 }
 430                 if (q == edit->bracket)
 431                     p->style |= MOD_BOLD;
 432                 if (q >= edit->found_start
 433                     && q < edit->found_start + edit->found_len)
 434                     p->style |= MOD_BOLD;
 435                 cw = 1;
 436                 if ( !edit->utf8 ) {
 437                     c = edit_get_byte (edit, q);
 438                 } else {
 439                     c = edit_get_utf (edit, q, &cw);
 440                 }
 441                 /* we don't use bg for mc - fg contains both */
 442                 if (book_mark) {
 443                     p->style |= book_mark << 16;
 444                 } else {
 445                     edit_get_syntax_color (edit, q, &color);
 446                     p->style |= color << 16;
 447                 }
 448                 switch (c) {
 449                 case '\n':
 450                     col = (end_col + utf8lag) - edit->start_col + 1;    /* quit */
 451                     break;
 452                 case '\t':
 453                     i = TAB_SIZE - ((int) col % TAB_SIZE);
 454                     col += i;
 455                     if (tty_use_colors() &&
 456                        ((visible_tabs || (visible_tws && q >= tws)) && enable_show_tabs_tws)) {
 457                         if (p->style & MOD_MARKED)
 458                             c = p->style;
 459                         else if (book_mark)
 460                             c |= book_mark << 16;
 461                         else
 462                             c = p->style | MOD_WHITESPACE;
 463                         if (i > 2) {
 464                             p->ch = '<';
 465                             p->style = c;
 466                             p++;
 467                             while (--i > 1) {
 468                                 p->ch = '-';
 469                                 p->style = c;
 470                                 p++;
 471                             }
 472                             p->ch = '>';
 473                             p->style = c;
 474                             p++;
 475                         } else if (i > 1) {
 476                             p->ch = '<';
 477                             p->style = c;
 478                             p++;
 479                             p->ch = '>';
 480                             p->style = c;
 481                             p++;
 482                         } else {
 483                             p->ch = '>';
 484                             p->style = c;
 485                             p++;
 486                         }
 487                     } else if (tty_use_colors() && visible_tws && q >= tws && enable_show_tabs_tws) {
 488                         p->ch = '.';
 489                         p->style |= MOD_WHITESPACE;
 490                         c = p->style & ~MOD_CURSOR;
 491                         p++;
 492                         while (--i) {
 493                             p->ch = ' ';
 494                             p->style = c;
 495                             p++;
 496                         }
 497                     } else {
 498                         p->ch |= ' ';
 499                         c = p->style & ~MOD_CURSOR;
 500                         p++;
 501                         while (--i) {
 502                             p->ch = ' ';
 503                             p->style = c;
 504                             p++;
 505                         }
 506                     }
 507                     break;
 508                 case ' ':
 509                     if (tty_use_colors() && visible_tws && q >= tws && enable_show_tabs_tws) {
 510                         p->ch = '.';
 511                         p->style |= MOD_WHITESPACE;
 512                         p++;
 513                         col++;
 514                         break;
 515                     }
 516                     /* fallthrough */
 517                 default:
 518 #ifdef HAVE_CHARSET
 519                     if ( utf8_display ) {
 520                         if ( !edit->utf8 ) {
 521                             c = convert_from_8bit_to_utf_c ((unsigned char) c, edit->converter);
 522                         }
 523                     } else {
 524                         if ( edit->utf8 ) {
 525                             c = convert_from_utf_to_current_c (c, edit->converter);
 526                         } else {
 527 #endif
 528                             c = convert_to_display_c (c);
 529 #ifdef HAVE_CHARSET
 530                         }
 531                     }
 532 #endif
 533                     /* Caret notation for control characters */
 534                     if (c < 32) {
 535                         p->ch = '^';
 536                         p->style = abn_style;
 537                         p++;
 538                         p->ch = c + 0x40;
 539                         p->style = abn_style;
 540                         p++;
 541                         col += 2;
 542                         break;
 543                     }
 544                     if (c == 127) {
 545                         p->ch = '^';
 546                         p->style = abn_style;
 547                         p++;
 548                         p->ch = '?';
 549                         p->style = abn_style;
 550                         p++;
 551                         col += 2;
 552                         break;
 553                     }
 554 #ifndef HAVE_CHARSET
 555                     int utf8_display = 0;
 556 #endif
 557                     if (!edit->utf8) {
 558                         if ( ( utf8_display && g_unichar_isprint (c) ) ||
 559                              ( utf8_display == 0 && is_printable (c) ) ) {
 560                                 p->ch = c;
 561                                 p++;
 562                         } else {
 563                                 p->ch = '.';
 564                                 p->style = abn_style;
 565                                 p++;
 566                         }
 567                     } else {
 568                         if ( g_unichar_isprint (c) ) {
 569                             p->ch = c;
 570                             p++;
 571                         } else {
 572                             p->ch = '.';
 573                             p->style = abn_style;
 574                             p++;
 575                         }
 576                     }
 577                     col++;
 578                     break;
 579                 }
 580                 q++;
 581                 if ( cw > 1) {
 582                   q += cw - 1;
 583                 }
 584             }
 585         }
 586     } else {
 587         start_col_real = start_col = 0;
 588     }
 589     p->ch = 0;
 590
 591     print_to_widget (edit, row, start_col, start_col_real, end_col, line, line_stat);
 592 }
 593
 594 #define key_pending(x) (!is_idle())
 595
 596 static void edit_draw_this_char (WEdit * edit, long curs, long row)
 597 {
 598     int b = edit_bol (edit, curs);
 599     edit_draw_this_line (edit, b, row, 0, edit->num_widget_columns - 1);
 600 }
 601
 602 /* cursor must be in screen for other than REDRAW_PAGE passed in force */
 603 static void
 604 render_edit_text (WEdit * edit, long start_row, long start_column, long end_row,
 605                   long end_column)
 606 {
 607     long row = 0, curs_row;
 608     static int prev_curs_row = 0;
 609     static long prev_curs = 0;
 610
 611     int force = edit->force;
 612     long b;
 613
 614 /*
 615  * If the position of the page has not moved then we can draw the cursor
 616  * character only.  This will prevent line flicker when using arrow keys.
 617  */
 618     if ((!(force & REDRAW_CHAR_ONLY)) || (force & REDRAW_PAGE)) {
 619         if (!(force & REDRAW_IN_BOUNDS)) {      /* !REDRAW_IN_BOUNDS means to ignore bounds and redraw whole rows */
 620             start_row = 0;
 621             end_row = edit->num_widget_lines - 1;
 622             start_column = 0;
 623             end_column = edit->num_widget_columns - 1;
 624         }
 625         if (force & REDRAW_PAGE) {
 626             row = start_row;
 627             b = edit_move_forward (edit, edit->start_display, start_row, 0);
 628             while (row <= end_row) {
 629                 if (key_pending (edit))
 630                     goto exit_render;
 631                 edit_draw_this_line (edit, b, row, start_column, end_column);
 632                 b = edit_move_forward (edit, b, 1, 0);
 633                 row++;
 634             }
 635         } else {
 636             curs_row = edit->curs_row;
 637
 638             if (force & REDRAW_BEFORE_CURSOR) {
 639                 if (start_row < curs_row) {
 640                     long upto = curs_row - 1 <= end_row ? curs_row - 1 : end_row;
 641                     row = start_row;
 642                     b = edit->start_display;
 643                     while (row <= upto) {
 644                         if (key_pending (edit))
 645                             goto exit_render;
 646                         edit_draw_this_line (edit, b, row, start_column, end_column);
 647                         b = edit_move_forward (edit, b, 1, 0);
 648                     }
 649                 }
 650             }
 651 /*          if (force & REDRAW_LINE)          ---> default */
 652             b = edit_bol (edit, edit->curs1);
 653             if (curs_row >= start_row && curs_row <= end_row) {
 654                 if (key_pending (edit))
 655                     goto exit_render;
 656                 edit_draw_this_line (edit, b, curs_row, start_column, end_column);
 657             }
 658             if (force & REDRAW_AFTER_CURSOR) {
 659                 if (end_row > curs_row) {
 660                     row = curs_row + 1 < start_row ? start_row : curs_row + 1;
 661                     b = edit_move_forward (edit, b, 1, 0);
 662                     while (row <= end_row) {
 663                         if (key_pending (edit))
 664                             goto exit_render;
 665                         edit_draw_this_line (edit, b, row, start_column, end_column);
 666                         b = edit_move_forward (edit, b, 1, 0);
 667                         row++;
 668                     }
 669                 }
 670             }
 671             if (force & REDRAW_LINE_ABOVE && curs_row >= 1) {
 672                 row = curs_row - 1;
 673                 b = edit_move_backward (edit, edit_bol (edit, edit->curs1), 1);
 674                 if (row >= start_row && row <= end_row) {
 675                     if (key_pending (edit))
 676                         goto exit_render;
 677                     edit_draw_this_line (edit, b, row, start_column, end_column);
 678                 }
 679             }
 680             if (force & REDRAW_LINE_BELOW && row < edit->num_widget_lines - 1) {
 681                 row = curs_row + 1;
 682                 b = edit_bol (edit, edit->curs1);
 683                 b = edit_move_forward (edit, b, 1, 0);
 684                 if (row >= start_row && row <= end_row) {
 685                     if (key_pending (edit))
 686                         goto exit_render;
 687                     edit_draw_this_line (edit, b, row, start_column, end_column);
 688                 }
 689             }
 690         }
 691     } else {
 692         if (prev_curs_row < edit->curs_row) {   /* with the new text highlighting, we must draw from the top down */
 693             edit_draw_this_char (edit, prev_curs, prev_curs_row);
 694             edit_draw_this_char (edit, edit->curs1, edit->curs_row);
 695         } else {
 696             edit_draw_this_char (edit, edit->curs1, edit->curs_row);
 697             edit_draw_this_char (edit, prev_curs, prev_curs_row);
 698         }
 699     }
 700
 701     edit->force = 0;
 702
 703     prev_curs_row = edit->curs_row;
 704     prev_curs = edit->curs1;
 705
 706   exit_render:
 707     edit->screen_modified = 0;
 708     return;
 709 }
 710
 711 static void
 712 edit_render (WEdit * edit, int page, int row_start, int col_start, int row_end, int col_end)
 713 {
 714     if (page)                   /* if it was an expose event, 'page' would be set */
 715         edit->force |= REDRAW_PAGE | REDRAW_IN_BOUNDS;
 716
 717     if (edit->force & REDRAW_COMPLETELY)
 718         buttonbar_redraw (edit->widget.parent);
 719     render_edit_text (edit, row_start, col_start, row_end, col_end);
 720     /*
 721      * edit->force != 0 means a key was pending and the redraw
 722      * was halted, so next time we must redraw everything in case stuff
 723      * was left undrawn from a previous key press.
 724      */
 725     if (edit->force)
 726         edit->force |= REDRAW_PAGE;
 727 }
 728
 729 void edit_render_keypress (WEdit * edit)
 730 {
 731     edit_render (edit, 0, 0, 0, 0, 0);
 732 }