src/editor/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 "lib/global.h"
  42 #include "lib/tty/tty.h"        /* tty_printf() */
  43 #include "lib/tty/key.h"        /* is_idle() */
  44 #include "lib/skin.h"
  45 #include "lib/strutil.h"        /* utf string functions */
  46
  47 #include "src/widget.h"         /* buttonbar_redraw() */
  48 #include "src/charsets.h"
  49 #include "src/main.h"           /* source_codepage */
  50 #include "src/setup.h"          /* edit_tab_spacing */
  51
  52 #include "edit-impl.h"
  53 #include "edit-widget.h"
  54
  55 #define MAX_LINE_LEN 1024
  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     {
  88         if (!edit->utf8)
  89         {
  90             cur_byte = edit_get_byte (edit, edit->curs1);
  91
  92             g_snprintf (byte_str, sizeof (byte_str), "%4d 0x%03X",
  93                         (int) cur_byte, (unsigned) cur_byte);
  94         }
  95         else
  96         {
  97             cur_utf = edit_get_utf (edit, edit->curs1, &cw);
  98             if (cw > 0)
  99             {
 100                 g_snprintf (byte_str, sizeof (byte_str), "%04d 0x%03X",
 101                             (unsigned) cur_utf, (unsigned) cur_utf);
 102             }
 103             else
 104             {
 105                 cur_utf = edit_get_byte (edit, edit->curs1);
 106                 g_snprintf (byte_str, sizeof (byte_str), "%04d 0x%03X",
 107                             (int) cur_utf, (unsigned) cur_utf);
 108             }
 109
 110         }
 111     }
 112     else
 113     {
 114         strcpy (byte_str, "<EOF>     ");
 115     }
 116
 117     /* The field lengths just prevent the status line from shortening too much */
 118     if (simple_statusbar)
 119         g_snprintf (s, w,
 120                     "%c%c%c%c %3ld %5ld/%ld %6ld/%ld %s %s",
 121                     edit->mark1 != edit->mark2 ? (edit->column_highlight ? 'C' : 'B') : '-',
 122                     edit->modified ? 'M' : '-',
 123                     edit->macro_i < 0 ? '-' : 'R',
 124                     edit->overwrite == 0 ? '-' : 'O',
 125                     edit->curs_col + edit->over_col,
 126                     edit->curs_line + 1,
 127                     edit->total_lines + 1, edit->curs1, edit->last_byte, byte_str,
 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 ? (edit->column_highlight ? '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                     edit->start_line + 1,
 143                     edit->curs_row,
 144                     edit->curs_line + 1,
 145                     edit->total_lines + 1, edit->curs1, edit->last_byte, byte_str,
 146 #ifdef HAVE_CHARSET
 147                     source_codepage >= 0 ? get_codepage_id (source_codepage) : ""
 148 #else
 149                     ""
 150 #endif
 151             );
 152 }
 153
 154 static inline void
 155 printwstr (const char *s, int len)
 156 {
 157     if (len > 0)
 158         tty_printf ("%-*.*s", len, len, s);
 159 }
 160
 161 /* Draw the status line at the top of the widget. The size of the filename
 162  * field varies depending on the width of the screen and the length of
 163  * the filename. */
 164 void
 165 edit_status (WEdit * edit)
 166 {
 167     const int w = edit->widget.cols;
 168     const size_t status_size = w + 1;
 169     char *const status = g_malloc (status_size);
 170     int status_len;
 171     const char *fname = "";
 172     int fname_len;
 173     const int gap = 3;          /* between the filename and the status */
 174     const int right_gap = 5;    /* at the right end of the screen */
 175     const int preferred_fname_len = 16;
 176
 177     status_string (edit, status, status_size);
 178     status_len = (int) str_term_width1 (status);
 179
 180     if (edit->filename)
 181         fname = edit->filename;
 182     fname_len = str_term_width1 (fname);
 183     if (fname_len < preferred_fname_len)
 184         fname_len = preferred_fname_len;
 185
 186     if (fname_len + gap + status_len + right_gap >= w)
 187     {
 188         if (preferred_fname_len + gap + status_len + right_gap >= w)
 189             fname_len = preferred_fname_len;
 190         else
 191             fname_len = w - (gap + status_len + right_gap);
 192         fname = str_trunc (fname, fname_len);
 193     }
 194
 195     widget_move (edit, 0, 0);
 196     tty_setcolor (SELECTED_COLOR);
 197     printwstr (fname, fname_len + gap);
 198     printwstr (status, w - (fname_len + gap));
 199
 200     if (simple_statusbar && edit->widget.cols > 30)
 201     {
 202         size_t percent;
 203         if (edit->total_lines + 1 != 0)
 204             percent = (edit->curs_line + 1) * 100 / (edit->total_lines + 1);
 205         else
 206             percent = 100;
 207         widget_move (edit, 0, edit->widget.cols - 5);
 208         tty_printf (" %3d%%", percent);
 209     }
 210     tty_setcolor (EDITOR_NORMAL_COLOR);
 211
 212     g_free (status);
 213 }
 214
 215 /* this scrolls the text so that cursor is on the screen */
 216 void
 217 edit_scroll_screen_over_cursor (WEdit * edit)
 218 {
 219     int p;
 220     int outby;
 221     int b_extreme, t_extreme, l_extreme, r_extreme;
 222
 223     if (edit->num_widget_lines <= 0 || edit->num_widget_columns <= 0)
 224         return;
 225
 226     edit->num_widget_columns -= EDIT_TEXT_HORIZONTAL_OFFSET + option_line_state_width;
 227     edit->num_widget_lines -= EDIT_TEXT_VERTICAL_OFFSET - 1;
 228
 229     r_extreme = EDIT_RIGHT_EXTREME;
 230     l_extreme = EDIT_LEFT_EXTREME;
 231     b_extreme = EDIT_BOTTOM_EXTREME;
 232     t_extreme = EDIT_TOP_EXTREME;
 233     if (edit->found_len)
 234     {
 235         b_extreme = max (edit->num_widget_lines / 4, b_extreme);
 236         t_extreme = max (edit->num_widget_lines / 4, t_extreme);
 237     }
 238     if (b_extreme + t_extreme + 1 > edit->num_widget_lines)
 239     {
 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     {
 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 {
 277     unsigned int ch;
 278     unsigned int style;
 279 };
 280
 281 static inline void
 282 print_to_widget (WEdit * edit, long row, int start_col, int start_col_real,
 283                  long end_col, struct line_s line[], char *status)
 284 {
 285     struct line_s *p;
 286
 287     int x = start_col_real;
 288     int x1 = start_col + EDIT_TEXT_HORIZONTAL_OFFSET + option_line_state_width;
 289     int y = row + EDIT_TEXT_VERTICAL_OFFSET;
 290     int cols_to_skip = abs (x);
 291     int i;
 292
 293     tty_setcolor (EDITOR_NORMAL_COLOR);
 294
 295     if (!show_right_margin)
 296     {
 297         tty_draw_hline (edit->widget.y + y, edit->widget.x + x1, ' ', end_col + 1 - start_col);
 298     }
 299     else if (edit->start_col < option_word_wrap_line_length)
 300     {
 301         tty_draw_hline (edit->widget.y + y,
 302                         edit->widget.x + x1, ' ', option_word_wrap_line_length - edit->start_col);
 303
 304         tty_setcolor (EDITOR_RIGHT_MARGIN_COLOR);
 305         tty_draw_hline (edit->widget.y + y,
 306                         edit->widget.x + x1 + option_word_wrap_line_length + edit->start_col,
 307                         ' ', end_col + 1 - start_col);
 308     }
 309
 310     if (option_line_state)
 311     {
 312         for (i = 0; i < LINE_STATE_WIDTH; i++)
 313             if (status[i] == '\0')
 314                 status[i] = ' ';
 315
 316         tty_setcolor (LINE_STATE_COLOR);
 317         edit_move (x1 + FONT_OFFSET_X - option_line_state_width, y + FONT_OFFSET_Y);
 318         tty_print_string (status);
 319     }
 320
 321     edit_move (x1 + FONT_OFFSET_X, y + FONT_OFFSET_Y);
 322     p = line;
 323     i = 1;
 324     while (p->ch)
 325     {
 326         int style;
 327         unsigned int textchar;
 328         int color;
 329
 330         if (cols_to_skip)
 331         {
 332             p++;
 333             cols_to_skip--;
 334             continue;
 335         }
 336
 337         style = p->style & 0xFF00;
 338         textchar = p->ch;
 339         color = p->style >> 16;
 340
 341         if (style & MOD_ABNORMAL)
 342         {
 343             /* Non-printable - use black background */
 344             color = 0;
 345         }
 346
 347         if (style & MOD_WHITESPACE)
 348         {
 349             if (style & MOD_MARKED)
 350             {
 351                 textchar = ' ';
 352                 tty_setcolor (EDITOR_MARKED_COLOR);
 353             }
 354             else
 355             {
 356 #if 0
 357                 if (color != EDITOR_NORMAL_COLOR)
 358                 {
 359                     textchar = ' ';
 360                     tty_lowlevel_setcolor (color);
 361                 }
 362                 else
 363 #endif
 364                     tty_setcolor (EDITOR_WHITESPACE_COLOR);
 365             }
 366         }
 367         else
 368         {
 369             if (style & MOD_BOLD)
 370             {
 371                 tty_setcolor (EDITOR_BOLD_COLOR);
 372             }
 373             else if (style & MOD_MARKED)
 374             {
 375                 tty_setcolor (EDITOR_MARKED_COLOR);
 376             }
 377             else
 378             {
 379                 tty_lowlevel_setcolor (color);
 380             }
 381         }
 382         if (show_right_margin)
 383         {
 384             if (i > option_word_wrap_line_length + edit->start_col)
 385                 tty_setcolor (EDITOR_RIGHT_MARGIN_COLOR);
 386             i++;
 387         }
 388         tty_print_anychar (textchar);
 389         p++;
 390     }
 391 }
 392
 393 int visible_tabs = 1, visible_tws = 1;
 394
 395 /* b is a pointer to the beginning of the line */
 396 static void
 397 edit_draw_this_line (WEdit * edit, long b, long row, long start_col, long end_col)
 398 {
 399     struct line_s line[MAX_LINE_LEN];
 400     struct line_s *p = line;
 401
 402     long m1 = 0, m2 = 0, q, c1, c2;
 403     int col, start_col_real;
 404     unsigned int c;
 405     int color;
 406     int abn_style;
 407     int i;
 408     int utf8lag = 0;
 409     unsigned int cur_line = 0;
 410     int book_mark = 0;
 411     char line_stat[LINE_STATE_WIDTH + 1];
 412
 413     if (row > edit->num_widget_lines - EDIT_TEXT_VERTICAL_OFFSET)
 414         return;
 415
 416     if (book_mark_query_color (edit, edit->start_line + row, BOOK_MARK_COLOR))
 417         book_mark = BOOK_MARK_COLOR;
 418     else if (book_mark_query_color (edit, edit->start_line + row, BOOK_MARK_FOUND_COLOR))
 419         book_mark = BOOK_MARK_FOUND_COLOR;
 420
 421     if (book_mark)
 422         abn_style = book_mark << 16;
 423     else
 424         abn_style = MOD_ABNORMAL;
 425
 426     end_col -= EDIT_TEXT_HORIZONTAL_OFFSET + option_line_state_width;
 427
 428     edit_get_syntax_color (edit, b - 1, &color);
 429     q = edit_move_forward3 (edit, b, start_col - edit->start_col, 0);
 430     start_col_real = (col = (int) edit_move_forward3 (edit, b, 0, q)) + edit->start_col;
 431     if (option_line_state)
 432     {
 433         cur_line = edit->start_line + row;
 434         if (cur_line <= (unsigned int) edit->total_lines)
 435         {
 436             g_snprintf (line_stat, LINE_STATE_WIDTH + 1, "%7i ", cur_line + 1);
 437         }
 438         else
 439         {
 440             memset (line_stat, ' ', LINE_STATE_WIDTH);
 441             line_stat[LINE_STATE_WIDTH] = '\0';
 442         }
 443         if (book_mark_query_color (edit, cur_line, BOOK_MARK_COLOR))
 444         {
 445             g_snprintf (line_stat, 2, "*");
 446         }
 447     }
 448
 449     if (col + 16 > -edit->start_col)
 450     {
 451         eval_marks (edit, &m1, &m2);
 452
 453         if (row <= edit->total_lines - edit->start_line)
 454         {
 455             long tws = 0;
 456             if (tty_use_colors () && visible_tws)
 457             {
 458                 tws = edit_eol (edit, b);
 459                 while (tws > b && ((c = edit_get_byte (edit, tws - 1)) == ' ' || c == '\t'))
 460                     tws--;
 461             }
 462
 463             while (col <= end_col - edit->start_col)
 464             {
 465                 int cw = 1;
 466
 467                 p->ch = 0;
 468                 p->style = 0;
 469                 if (q == edit->curs1)
 470                     p->style |= MOD_CURSOR;
 471                 if (q >= m1 && q < m2)
 472                 {
 473                     if (edit->column_highlight)
 474                     {
 475                         int x;
 476                         x = edit_move_forward3 (edit, b, 0, q);
 477                         c1 = min (edit->column1, edit->column2);
 478                         c2 = max (edit->column1, edit->column2);
 479                         if (x >= c1 && x < c2)
 480                             p->style |= MOD_MARKED;
 481                     }
 482                     else
 483                         p->style |= MOD_MARKED;
 484                 }
 485                 if (q == edit->bracket)
 486                     p->style |= MOD_BOLD;
 487                 if (q >= edit->found_start && q < edit->found_start + edit->found_len)
 488                     p->style |= MOD_BOLD;
 489
 490                 if (!edit->utf8)
 491                 {
 492                     c = edit_get_byte (edit, q);
 493                 }
 494                 else
 495                 {
 496                     c = edit_get_utf (edit, q, &cw);
 497                 }
 498                 /* we don't use bg for mc - fg contains both */
 499                 if (book_mark)
 500                 {
 501                     p->style |= book_mark << 16;
 502                 }
 503                 else
 504                 {
 505                     edit_get_syntax_color (edit, q, &color);
 506                     p->style |= color << 16;
 507                 }
 508                 switch (c)
 509                 {
 510                 case '\n':
 511                     col = (end_col + utf8lag) - edit->start_col + 1;    /* quit */
 512                     break;
 513                 case '\t':
 514                     i = TAB_SIZE - ((int) col % TAB_SIZE);
 515                     col += i;
 516                     if (tty_use_colors () &&
 517                         ((visible_tabs || (visible_tws && q >= tws)) && enable_show_tabs_tws))
 518                     {
 519                         if (p->style & MOD_MARKED)
 520                             c = p->style;
 521                         else if (book_mark)
 522                             c |= book_mark << 16;
 523                         else
 524                             c = p->style | MOD_WHITESPACE;
 525                         if (i > 2)
 526                         {
 527                             p->ch = '<';
 528                             p->style = c;
 529                             p++;
 530                             while (--i > 1)
 531                             {
 532                                 p->ch = '-';
 533                                 p->style = c;
 534                                 p++;
 535                             }
 536                             p->ch = '>';
 537                             p->style = c;
 538                             p++;
 539                         }
 540                         else if (i > 1)
 541                         {
 542                             p->ch = '<';
 543                             p->style = c;
 544                             p++;
 545                             p->ch = '>';
 546                             p->style = c;
 547                             p++;
 548                         }
 549                         else
 550                         {
 551                             p->ch = '>';
 552                             p->style = c;
 553                             p++;
 554                         }
 555                     }
 556                     else if (tty_use_colors () && visible_tws && q >= tws && enable_show_tabs_tws)
 557                     {
 558                         p->ch = '.';
 559                         p->style |= MOD_WHITESPACE;
 560                         c = p->style & ~MOD_CURSOR;
 561                         p++;
 562                         while (--i)
 563                         {
 564                             p->ch = ' ';
 565                             p->style = c;
 566                             p++;
 567                         }
 568                     }
 569                     else
 570                     {
 571                         p->ch |= ' ';
 572                         c = p->style & ~MOD_CURSOR;
 573                         p++;
 574                         while (--i)
 575                         {
 576                             p->ch = ' ';
 577                             p->style = c;
 578                             p++;
 579                         }
 580                     }
 581                     break;
 582                 case ' ':
 583                     if (tty_use_colors () && visible_tws && q >= tws && enable_show_tabs_tws)
 584                     {
 585                         p->ch = '.';
 586                         p->style |= MOD_WHITESPACE;
 587                         p++;
 588                         col++;
 589                         break;
 590                     }
 591                     /* fallthrough */
 592                 default:
 593 #ifdef HAVE_CHARSET
 594                     if (utf8_display)
 595                     {
 596                         if (!edit->utf8)
 597                         {
 598                             c = convert_from_8bit_to_utf_c ((unsigned char) c, edit->converter);
 599                         }
 600                     }
 601                     else if (edit->utf8)
 602                         c = convert_from_utf_to_current_c (c, edit->converter);
 603                     else
 604 #endif
 605                         c = convert_to_display_c (c);
 606
 607                     /* Caret notation for control characters */
 608                     if (c < 32)
 609                     {
 610                         p->ch = '^';
 611                         p->style = abn_style;
 612                         p++;
 613                         p->ch = c + 0x40;
 614                         p->style = abn_style;
 615                         p++;
 616                         col += 2;
 617                         break;
 618                     }
 619                     if (c == 127)
 620                     {
 621                         p->ch = '^';
 622                         p->style = abn_style;
 623                         p++;
 624                         p->ch = '?';
 625                         p->style = abn_style;
 626                         p++;
 627                         col += 2;
 628                         break;
 629                     }
 630                     if (!edit->utf8)
 631                     {
 632                         if ((utf8_display && g_unichar_isprint (c)) ||
 633                             (!utf8_display && is_printable (c)))
 634                         {
 635                             p->ch = c;
 636                             p++;
 637                         }
 638                         else
 639                         {
 640                             p->ch = '.';
 641                             p->style = abn_style;
 642                             p++;
 643                         }
 644                     }
 645                     else
 646                     {
 647                         if (g_unichar_isprint (c))
 648                         {
 649                             p->ch = c;
 650                             p++;
 651                         }
 652                         else
 653                         {
 654                             p->ch = '.';
 655                             p->style = abn_style;
 656                             p++;
 657                         }
 658                     }
 659                     col++;
 660                     break;
 661                 }               /* case */
 662
 663                 q++;
 664                 if (cw > 1)
 665                 {
 666                     q += cw - 1;
 667                 }
 668             }
 669         }
 670     }
 671     else
 672     {
 673         start_col_real = start_col = 0;
 674     }
 675
 676     p->ch = '\0';
 677
 678     print_to_widget (edit, row, start_col, start_col_real, end_col, line, line_stat);
 679 }
 680
 681 #define key_pending(x) (!is_idle())
 682
 683 static inline void
 684 edit_draw_this_char (WEdit * edit, long curs, long row)
 685 {
 686     int b = edit_bol (edit, curs);
 687     edit_draw_this_line (edit, b, row, 0, edit->num_widget_columns - 1);
 688 }
 689
 690 /* cursor must be in screen for other than REDRAW_PAGE passed in force */
 691 static inline void
 692 render_edit_text (WEdit * edit, long start_row, long start_column, long end_row, long end_column)
 693 {
 694     long row = 0, curs_row;
 695     static long prev_curs_row = 0;
 696     static long prev_curs = 0;
 697
 698     int force = edit->force;
 699     long b;
 700
 701     /*
 702      * If the position of the page has not moved then we can draw the cursor
 703      * character only.  This will prevent line flicker when using arrow keys.
 704      */
 705     if ((!(force & REDRAW_CHAR_ONLY)) || (force & REDRAW_PAGE))
 706     {
 707         if (!(force & REDRAW_IN_BOUNDS))
 708         {                       /* !REDRAW_IN_BOUNDS means to ignore bounds and redraw whole rows */
 709             start_row = 0;
 710             end_row = edit->num_widget_lines - 1;
 711             start_column = 0;
 712             end_column = edit->num_widget_columns - 1;
 713         }
 714         if (force & REDRAW_PAGE)
 715         {
 716             row = start_row;
 717             b = edit_move_forward (edit, edit->start_display, start_row, 0);
 718             while (row <= end_row)
 719             {
 720                 if (key_pending (edit))
 721                     goto exit_render;
 722                 edit_draw_this_line (edit, b, row, start_column, end_column);
 723                 b = edit_move_forward (edit, b, 1, 0);
 724                 row++;
 725             }
 726         }
 727         else
 728         {
 729             curs_row = edit->curs_row;
 730
 731             if (force & REDRAW_BEFORE_CURSOR)
 732             {
 733                 if (start_row < curs_row)
 734                 {
 735                     long upto = curs_row - 1 <= end_row ? curs_row - 1 : end_row;
 736                     row = start_row;
 737                     b = edit->start_display;
 738                     while (row <= upto)
 739                     {
 740                         if (key_pending (edit))
 741                             goto exit_render;
 742                         edit_draw_this_line (edit, b, row, start_column, end_column);
 743                         b = edit_move_forward (edit, b, 1, 0);
 744                     }
 745                 }
 746             }
 747             /*          if (force & REDRAW_LINE)          ---> default */
 748             b = edit_bol (edit, edit->curs1);
 749             if (curs_row >= start_row && curs_row <= end_row)
 750             {
 751                 if (key_pending (edit))
 752                     goto exit_render;
 753                 edit_draw_this_line (edit, b, curs_row, start_column, end_column);
 754             }
 755             if (force & REDRAW_AFTER_CURSOR)
 756             {
 757                 if (end_row > curs_row)
 758                 {
 759                     row = curs_row + 1 < start_row ? start_row : curs_row + 1;
 760                     b = edit_move_forward (edit, b, 1, 0);
 761                     while (row <= end_row)
 762                     {
 763                         if (key_pending (edit))
 764                             goto exit_render;
 765                         edit_draw_this_line (edit, b, row, start_column, end_column);
 766                         b = edit_move_forward (edit, b, 1, 0);
 767                         row++;
 768                     }
 769                 }
 770             }
 771             if (force & REDRAW_LINE_ABOVE && curs_row >= 1)
 772             {
 773                 row = curs_row - 1;
 774                 b = edit_move_backward (edit, edit_bol (edit, edit->curs1), 1);
 775                 if (row >= start_row && row <= end_row)
 776                 {
 777                     if (key_pending (edit))
 778                         goto exit_render;
 779                     edit_draw_this_line (edit, b, row, start_column, end_column);
 780                 }
 781             }
 782             if (force & REDRAW_LINE_BELOW && row < edit->num_widget_lines - 1)
 783             {
 784                 row = curs_row + 1;
 785                 b = edit_bol (edit, edit->curs1);
 786                 b = edit_move_forward (edit, b, 1, 0);
 787                 if (row >= start_row && row <= end_row)
 788                 {
 789                     if (key_pending (edit))
 790                         goto exit_render;
 791                     edit_draw_this_line (edit, b, row, start_column, end_column);
 792                 }
 793             }
 794         }
 795     }
 796     else
 797     {
 798         if (prev_curs_row < edit->curs_row)
 799         {                       /* with the new text highlighting, we must draw from the top down */
 800             edit_draw_this_char (edit, prev_curs, prev_curs_row);
 801             edit_draw_this_char (edit, edit->curs1, edit->curs_row);
 802         }
 803         else
 804         {
 805             edit_draw_this_char (edit, edit->curs1, edit->curs_row);
 806             edit_draw_this_char (edit, prev_curs, prev_curs_row);
 807         }
 808     }
 809
 810     edit->force = 0;
 811
 812     prev_curs_row = edit->curs_row;
 813     prev_curs = edit->curs1;
 814
 815   exit_render:
 816     edit->screen_modified = 0;
 817 }
 818
 819 static inline void
 820 edit_render (WEdit * edit, int page, int row_start, int col_start, int row_end, int col_end)
 821 {
 822     if (page)                   /* if it was an expose event, 'page' would be set */
 823         edit->force |= REDRAW_PAGE | REDRAW_IN_BOUNDS;
 824
 825     if (edit->force & REDRAW_COMPLETELY)
 826         buttonbar_redraw (find_buttonbar (edit->widget.owner));
 827     render_edit_text (edit, row_start, col_start, row_end, col_end);
 828     /*
 829      * edit->force != 0 means a key was pending and the redraw
 830      * was halted, so next time we must redraw everything in case stuff
 831      * was left undrawn from a previous key press.
 832      */
 833     if (edit->force)
 834         edit->force |= REDRAW_PAGE;
 835 }
 836
 837 void
 838 edit_render_keypress (WEdit * edit)
 839 {
 840     edit_render (edit, 0, 0, 0, 0, 0);
 841 }