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 #include "lib/util.h"           /* is_printable() */
  47 #include "lib/widget.h"         /* buttonbar_redraw() */
  48 #include "lib/charsets.h"
  49
  50 #include "src/main.h"           /* source_codepage */
  51 #include "src/setup.h"          /* edit_tab_spacing */
  52
  53 #include "edit-impl.h"
  54 #include "edit-widget.h"
  55
  56 /*** global variables ****************************************************************************/
  57
  58 /* Toggles statusbar draw style */
  59 int simple_statusbar = 0;
  60
  61 int visible_tabs = 1, visible_tws = 1;
  62
  63 /*** file scope macro definitions ****************************************************************/
  64
  65 #define MAX_LINE_LEN 1024
  66
  67 /* Text styles */
  68 #define MOD_ABNORMAL            (1 << 8)
  69 #define MOD_BOLD                (1 << 9)
  70 #define MOD_MARKED              (1 << 10)
  71 #define MOD_CURSOR              (1 << 11)
  72 #define MOD_WHITESPACE          (1 << 12)
  73
  74 #define FONT_OFFSET_X 0
  75 #define FONT_OFFSET_Y 0
  76 #define FIXED_FONT 1
  77 #define FONT_PIX_PER_LINE 1
  78 #define FONT_MEAN_WIDTH 1
  79
  80 #define edit_move(x,y) widget_move(edit, y, x);
  81
  82 #define key_pending(x) (!is_idle())
  83
  84
  85 /*** file scope type declarations ****************************************************************/
  86
  87 struct line_s
  88 {
  89     unsigned int ch;
  90     unsigned int style;
  91 };
  92
  93 /*** file scope variables ************************************************************************/
  94
  95 /*** file scope functions ************************************************************************/
  96 /* --------------------------------------------------------------------------------------------- */
  97
  98 static inline void
  99 status_string (WEdit * edit, char *s, int w)
 100 {
 101     char byte_str[16];
 102     unsigned char cur_byte = 0;
 103     unsigned int cur_utf = 0;
 104     int cw = 1;
 105
 106     /*
 107      * If we are at the end of file, print <EOF>,
 108      * otherwise print the current character as is (if printable),
 109      * as decimal and as hex.
 110      */
 111     if (edit->curs1 < edit->last_byte)
 112     {
 113         if (!edit->utf8)
 114         {
 115             cur_byte = edit_get_byte (edit, edit->curs1);
 116
 117             g_snprintf (byte_str, sizeof (byte_str), "%4d 0x%03X",
 118                         (int) cur_byte, (unsigned) cur_byte);
 119         }
 120         else
 121         {
 122             cur_utf = edit_get_utf (edit, edit->curs1, &cw);
 123             if (cw > 0)
 124             {
 125                 g_snprintf (byte_str, sizeof (byte_str), "%04d 0x%03X",
 126                             (unsigned) cur_utf, (unsigned) cur_utf);
 127             }
 128             else
 129             {
 130                 cur_utf = edit_get_byte (edit, edit->curs1);
 131                 g_snprintf (byte_str, sizeof (byte_str), "%04d 0x%03X",
 132                             (int) cur_utf, (unsigned) cur_utf);
 133             }
 134
 135         }
 136     }
 137     else
 138     {
 139         strcpy (byte_str, "<EOF>     ");
 140     }
 141
 142     /* The field lengths just prevent the status line from shortening too much */
 143     if (simple_statusbar)
 144         g_snprintf (s, w,
 145                     "%c%c%c%c %3ld %5ld/%ld %6ld/%ld %s %s",
 146                     edit->mark1 != edit->mark2 ? (edit->column_highlight ? 'C' : 'B') : '-',
 147                     edit->modified ? 'M' : '-',
 148                     edit->macro_i < 0 ? '-' : 'R',
 149                     edit->overwrite == 0 ? '-' : 'O',
 150                     edit->curs_col + edit->over_col,
 151                     edit->curs_line + 1,
 152                     edit->total_lines + 1, edit->curs1, edit->last_byte, byte_str,
 153 #ifdef HAVE_CHARSET
 154                     source_codepage >= 0 ? get_codepage_id (source_codepage) : ""
 155 #else
 156                     ""
 157 #endif
 158             );
 159     else
 160         g_snprintf (s, w,
 161                     "[%c%c%c%c] %2ld L:[%3ld+%2ld %3ld/%3ld] *(%-4ld/%4ldb) %s  %s",
 162                     edit->mark1 != edit->mark2 ? (edit->column_highlight ? 'C' : 'B') : '-',
 163                     edit->modified ? 'M' : '-',
 164                     edit->macro_i < 0 ? '-' : 'R',
 165                     edit->overwrite == 0 ? '-' : 'O',
 166                     edit->curs_col + edit->over_col,
 167                     edit->start_line + 1,
 168                     edit->curs_row,
 169                     edit->curs_line + 1,
 170                     edit->total_lines + 1, edit->curs1, edit->last_byte, byte_str,
 171 #ifdef HAVE_CHARSET
 172                     source_codepage >= 0 ? get_codepage_id (source_codepage) : ""
 173 #else
 174                     ""
 175 #endif
 176             );
 177 }
 178
 179 /* --------------------------------------------------------------------------------------------- */
 180
 181 static inline void
 182 printwstr (const char *s, int len)
 183 {
 184     if (len > 0)
 185         tty_printf ("%-*.*s", len, len, s);
 186 }
 187
 188 /* --------------------------------------------------------------------------------------------- */
 189
 190 static inline void
 191 print_to_widget (WEdit * edit, long row, int start_col, int start_col_real,
 192                  long end_col, struct line_s line[], char *status, int bookmarked)
 193 {
 194     struct line_s *p;
 195
 196     int x = start_col_real;
 197     int x1 = start_col + EDIT_TEXT_HORIZONTAL_OFFSET + option_line_state_width;
 198     int y = row + EDIT_TEXT_VERTICAL_OFFSET;
 199     int cols_to_skip = abs (x);
 200     int i;
 201
 202     tty_setcolor (EDITOR_NORMAL_COLOR);
 203     if (bookmarked != 0)
 204         tty_setcolor (bookmarked);
 205
 206     if (!show_right_margin)
 207     {
 208         tty_draw_hline (edit->widget.y + y, edit->widget.x + x1, ' ', end_col + 1 - start_col);
 209     }
 210     else if (edit->start_col < option_word_wrap_line_length)
 211     {
 212         tty_draw_hline (edit->widget.y + y,
 213                         edit->widget.x + x1, ' ', option_word_wrap_line_length - edit->start_col);
 214
 215         tty_setcolor (EDITOR_RIGHT_MARGIN_COLOR);
 216         tty_draw_hline (edit->widget.y + y,
 217                         edit->widget.x + x1 + option_word_wrap_line_length + edit->start_col,
 218                         ' ', end_col + 1 - start_col);
 219     }
 220
 221     if (option_line_state)
 222     {
 223         for (i = 0; i < LINE_STATE_WIDTH; i++)
 224             if (status[i] == '\0')
 225                 status[i] = ' ';
 226
 227         tty_setcolor (LINE_STATE_COLOR);
 228         edit_move (x1 + FONT_OFFSET_X - option_line_state_width, y + FONT_OFFSET_Y);
 229         tty_print_string (status);
 230     }
 231
 232     edit_move (x1 + FONT_OFFSET_X, y + FONT_OFFSET_Y);
 233     p = line;
 234     i = 1;
 235     while (p->ch)
 236     {
 237         int style;
 238         unsigned int textchar;
 239         int color;
 240
 241         if (cols_to_skip)
 242         {
 243             p++;
 244             cols_to_skip--;
 245             continue;
 246         }
 247
 248         style = p->style & 0xFF00;
 249         textchar = p->ch;
 250         color = p->style >> 16;
 251
 252         if (style & MOD_ABNORMAL)
 253         {
 254             /* Non-printable - use black background */
 255             color = 0;
 256         }
 257
 258         if (style & MOD_WHITESPACE)
 259         {
 260             if (style & MOD_MARKED)
 261             {
 262                 textchar = ' ';
 263                 tty_setcolor (EDITOR_MARKED_COLOR);
 264             }
 265             else
 266             {
 267 #if 0
 268                 if (color != EDITOR_NORMAL_COLOR)
 269                 {
 270                     textchar = ' ';
 271                     tty_lowlevel_setcolor (color);
 272                 }
 273                 else
 274 #endif
 275                     tty_setcolor (EDITOR_WHITESPACE_COLOR);
 276             }
 277         }
 278         else
 279         {
 280             if (style & MOD_BOLD)
 281             {
 282                 tty_setcolor (EDITOR_BOLD_COLOR);
 283             }
 284             else if (style & MOD_MARKED)
 285             {
 286                 tty_setcolor (EDITOR_MARKED_COLOR);
 287             }
 288             else
 289             {
 290                 tty_lowlevel_setcolor (color);
 291             }
 292         }
 293         if (show_right_margin)
 294         {
 295             if (i > option_word_wrap_line_length + edit->start_col)
 296                 tty_setcolor (EDITOR_RIGHT_MARGIN_COLOR);
 297             i++;
 298         }
 299         tty_print_anychar (textchar);
 300         p++;
 301     }
 302 }
 303
 304 /* --------------------------------------------------------------------------------------------- */
 305 /** b is a pointer to the beginning of the line */
 306
 307 static void
 308 edit_draw_this_line (WEdit * edit, long b, long row, long start_col, long end_col)
 309 {
 310     struct line_s line[MAX_LINE_LEN];
 311     struct line_s *p = line;
 312
 313     long m1 = 0, m2 = 0, q, c1, c2;
 314     int col, start_col_real;
 315     unsigned int c;
 316     int color;
 317     int abn_style;
 318     int i;
 319     int utf8lag = 0;
 320     unsigned int cur_line = 0;
 321     int book_mark = 0;
 322     char line_stat[LINE_STATE_WIDTH + 1];
 323
 324     if (row > edit->widget.lines - EDIT_TEXT_VERTICAL_OFFSET)
 325         return;
 326
 327     if (book_mark_query_color (edit, edit->start_line + row, BOOK_MARK_COLOR))
 328         book_mark = BOOK_MARK_COLOR;
 329     else if (book_mark_query_color (edit, edit->start_line + row, BOOK_MARK_FOUND_COLOR))
 330         book_mark = BOOK_MARK_FOUND_COLOR;
 331
 332     if (book_mark)
 333         abn_style = book_mark << 16;
 334     else
 335         abn_style = MOD_ABNORMAL;
 336
 337     end_col -= EDIT_TEXT_HORIZONTAL_OFFSET + option_line_state_width;
 338
 339     edit_get_syntax_color (edit, b - 1, &color);
 340     q = edit_move_forward3 (edit, b, start_col - edit->start_col, 0);
 341     start_col_real = (col = (int) edit_move_forward3 (edit, b, 0, q)) + edit->start_col;
 342     if (option_line_state)
 343     {
 344         cur_line = edit->start_line + row;
 345         if (cur_line <= (unsigned int) edit->total_lines)
 346         {
 347             g_snprintf (line_stat, LINE_STATE_WIDTH + 1, "%7i ", cur_line + 1);
 348         }
 349         else
 350         {
 351             memset (line_stat, ' ', LINE_STATE_WIDTH);
 352             line_stat[LINE_STATE_WIDTH] = '\0';
 353         }
 354         if (book_mark_query_color (edit, cur_line, BOOK_MARK_COLOR))
 355         {
 356             g_snprintf (line_stat, 2, "*");
 357         }
 358     }
 359
 360     if (col + 16 > -edit->start_col)
 361     {
 362         eval_marks (edit, &m1, &m2);
 363
 364         if (row <= edit->total_lines - edit->start_line)
 365         {
 366             long tws = 0;
 367             if (tty_use_colors () && visible_tws)
 368             {
 369                 tws = edit_eol (edit, b);
 370                 while (tws > b && ((c = edit_get_byte (edit, tws - 1)) == ' ' || c == '\t'))
 371                     tws--;
 372             }
 373
 374             while (col <= end_col - edit->start_col)
 375             {
 376                 int cw = 1;
 377
 378                 p->ch = 0;
 379                 p->style = 0;
 380                 if (q == edit->curs1)
 381                     p->style |= MOD_CURSOR;
 382                 if (q >= m1 && q < m2)
 383                 {
 384                     if (edit->column_highlight)
 385                     {
 386                         int x;
 387                         x = edit_move_forward3 (edit, b, 0, q);
 388                         c1 = min (edit->column1, edit->column2);
 389                         c2 = max (edit->column1, edit->column2);
 390                         if (x >= c1 && x < c2)
 391                             p->style |= MOD_MARKED;
 392                     }
 393                     else
 394                         p->style |= MOD_MARKED;
 395                 }
 396                 if (q == edit->bracket)
 397                     p->style |= MOD_BOLD;
 398                 if (q >= edit->found_start && q < edit->found_start + edit->found_len)
 399                     p->style |= MOD_BOLD;
 400
 401                 if (!edit->utf8)
 402                 {
 403                     c = edit_get_byte (edit, q);
 404                 }
 405                 else
 406                 {
 407                     c = edit_get_utf (edit, q, &cw);
 408                 }
 409                 /* we don't use bg for mc - fg contains both */
 410                 if (book_mark)
 411                 {
 412                     p->style |= book_mark << 16;
 413                 }
 414                 else
 415                 {
 416                     edit_get_syntax_color (edit, q, &color);
 417                     p->style |= color << 16;
 418                 }
 419                 switch (c)
 420                 {
 421                 case '\n':
 422                     col = (end_col + utf8lag) - edit->start_col + 1;    /* quit */
 423                     break;
 424                 case '\t':
 425                     i = TAB_SIZE - ((int) col % TAB_SIZE);
 426                     col += i;
 427                     if (tty_use_colors () &&
 428                         ((visible_tabs || (visible_tws && q >= tws)) && enable_show_tabs_tws))
 429                     {
 430                         if (p->style & MOD_MARKED)
 431                             c = p->style;
 432                         else if (book_mark)
 433                             c |= book_mark << 16;
 434                         else
 435                             c = p->style | MOD_WHITESPACE;
 436                         if (i > 2)
 437                         {
 438                             p->ch = '<';
 439                             p->style = c;
 440                             p++;
 441                             while (--i > 1)
 442                             {
 443                                 p->ch = '-';
 444                                 p->style = c;
 445                                 p++;
 446                             }
 447                             p->ch = '>';
 448                             p->style = c;
 449                             p++;
 450                         }
 451                         else if (i > 1)
 452                         {
 453                             p->ch = '<';
 454                             p->style = c;
 455                             p++;
 456                             p->ch = '>';
 457                             p->style = c;
 458                             p++;
 459                         }
 460                         else
 461                         {
 462                             p->ch = '>';
 463                             p->style = c;
 464                             p++;
 465                         }
 466                     }
 467                     else if (tty_use_colors () && visible_tws && q >= tws && enable_show_tabs_tws)
 468                     {
 469                         p->ch = '.';
 470                         p->style |= MOD_WHITESPACE;
 471                         c = p->style & ~MOD_CURSOR;
 472                         p++;
 473                         while (--i)
 474                         {
 475                             p->ch = ' ';
 476                             p->style = c;
 477                             p++;
 478                         }
 479                     }
 480                     else
 481                     {
 482                         p->ch |= ' ';
 483                         c = p->style & ~MOD_CURSOR;
 484                         p++;
 485                         while (--i)
 486                         {
 487                             p->ch = ' ';
 488                             p->style = c;
 489                             p++;
 490                         }
 491                     }
 492                     break;
 493                 case ' ':
 494                     if (tty_use_colors () && visible_tws && q >= tws && enable_show_tabs_tws)
 495                     {
 496                         p->ch = '.';
 497                         p->style |= MOD_WHITESPACE;
 498                         p++;
 499                         col++;
 500                         break;
 501                     }
 502                     /* fallthrough */
 503                 default:
 504 #ifdef HAVE_CHARSET
 505                     if (utf8_display)
 506                     {
 507                         if (!edit->utf8)
 508                         {
 509                             c = convert_from_8bit_to_utf_c ((unsigned char) c, edit->converter);
 510                         }
 511                     }
 512                     else if (edit->utf8)
 513                         c = convert_from_utf_to_current_c (c, edit->converter);
 514                     else
 515 #endif
 516                         c = convert_to_display_c (c);
 517
 518                     /* Caret notation for control characters */
 519                     if (c < 32)
 520                     {
 521                         p->ch = '^';
 522                         p->style = abn_style;
 523                         p++;
 524                         p->ch = c + 0x40;
 525                         p->style = abn_style;
 526                         p++;
 527                         col += 2;
 528                         break;
 529                     }
 530                     if (c == 127)
 531                     {
 532                         p->ch = '^';
 533                         p->style = abn_style;
 534                         p++;
 535                         p->ch = '?';
 536                         p->style = abn_style;
 537                         p++;
 538                         col += 2;
 539                         break;
 540                     }
 541                     if (!edit->utf8)
 542                     {
 543                         if ((utf8_display && g_unichar_isprint (c)) ||
 544                             (!utf8_display && is_printable (c)))
 545                         {
 546                             p->ch = c;
 547                             p++;
 548                         }
 549                         else
 550                         {
 551                             p->ch = '.';
 552                             p->style = abn_style;
 553                             p++;
 554                         }
 555                     }
 556                     else
 557                     {
 558                         if (g_unichar_isprint (c))
 559                         {
 560                             p->ch = c;
 561                             p++;
 562                         }
 563                         else
 564                         {
 565                             p->ch = '.';
 566                             p->style = abn_style;
 567                             p++;
 568                         }
 569                     }
 570                     col++;
 571                     break;
 572                 }               /* case */
 573
 574                 q++;
 575                 if (cw > 1)
 576                 {
 577                     q += cw - 1;
 578                 }
 579             }
 580         }
 581     }
 582     else
 583     {
 584         start_col_real = start_col = 0;
 585     }
 586
 587     p->ch = '\0';
 588
 589     print_to_widget (edit, row, start_col, start_col_real, end_col, line, line_stat, book_mark);
 590 }
 591
 592 /* --------------------------------------------------------------------------------------------- */
 593
 594 static inline void
 595 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->widget.cols - 1);
 599 }
 600
 601 /* --------------------------------------------------------------------------------------------- */
 602 /** cursor must be in screen for other than REDRAW_PAGE passed in force */
 603
 604 static inline void
 605 render_edit_text (WEdit * edit, long start_row, long start_column, long end_row, long end_column)
 606 {
 607     long row = 0, curs_row;
 608     static long 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     {
 620         if (!(force & REDRAW_IN_BOUNDS))
 621         {                       /* !REDRAW_IN_BOUNDS means to ignore bounds and redraw whole rows */
 622             start_row = 0;
 623             end_row = edit->widget.lines - 1;
 624             start_column = 0;
 625             end_column = edit->widget.cols - 1;
 626         }
 627         if (force & REDRAW_PAGE)
 628         {
 629             row = start_row;
 630             b = edit_move_forward (edit, edit->start_display, start_row, 0);
 631             while (row <= end_row)
 632             {
 633                 if (key_pending (edit))
 634                     return;
 635                 edit_draw_this_line (edit, b, row, start_column, end_column);
 636                 b = edit_move_forward (edit, b, 1, 0);
 637                 row++;
 638             }
 639         }
 640         else
 641         {
 642             curs_row = edit->curs_row;
 643
 644             if (force & REDRAW_BEFORE_CURSOR)
 645             {
 646                 if (start_row < curs_row)
 647                 {
 648                     long upto = curs_row - 1 <= end_row ? curs_row - 1 : end_row;
 649                     row = start_row;
 650                     b = edit->start_display;
 651                     while (row <= upto)
 652                     {
 653                         if (key_pending (edit))
 654                             return;
 655                         edit_draw_this_line (edit, b, row, start_column, end_column);
 656                         b = edit_move_forward (edit, b, 1, 0);
 657                     }
 658                 }
 659             }
 660             /*          if (force & REDRAW_LINE)          ---> default */
 661             b = edit_bol (edit, edit->curs1);
 662             if (curs_row >= start_row && curs_row <= end_row)
 663             {
 664                 if (key_pending (edit))
 665                     return;
 666                 edit_draw_this_line (edit, b, curs_row, start_column, end_column);
 667             }
 668             if (force & REDRAW_AFTER_CURSOR)
 669             {
 670                 if (end_row > curs_row)
 671                 {
 672                     row = curs_row + 1 < start_row ? start_row : curs_row + 1;
 673                     b = edit_move_forward (edit, b, 1, 0);
 674                     while (row <= end_row)
 675                     {
 676                         if (key_pending (edit))
 677                             return;
 678                         edit_draw_this_line (edit, b, row, start_column, end_column);
 679                         b = edit_move_forward (edit, b, 1, 0);
 680                         row++;
 681                     }
 682                 }
 683             }
 684             if (force & REDRAW_LINE_ABOVE && curs_row >= 1)
 685             {
 686                 row = curs_row - 1;
 687                 b = edit_move_backward (edit, edit_bol (edit, edit->curs1), 1);
 688                 if (row >= start_row && row <= end_row)
 689                 {
 690                     if (key_pending (edit))
 691                         return;
 692                     edit_draw_this_line (edit, b, row, start_column, end_column);
 693                 }
 694             }
 695             if (force & REDRAW_LINE_BELOW && row < edit->widget.lines - 1)
 696             {
 697                 row = curs_row + 1;
 698                 b = edit_bol (edit, edit->curs1);
 699                 b = edit_move_forward (edit, b, 1, 0);
 700                 if (row >= start_row && row <= end_row)
 701                 {
 702                     if (key_pending (edit))
 703                         return;
 704                     edit_draw_this_line (edit, b, row, start_column, end_column);
 705                 }
 706             }
 707         }
 708     }
 709     else
 710     {
 711         if (prev_curs_row < edit->curs_row)
 712         {                       /* with the new text highlighting, we must draw from the top down */
 713             edit_draw_this_char (edit, prev_curs, prev_curs_row);
 714             edit_draw_this_char (edit, edit->curs1, edit->curs_row);
 715         }
 716         else
 717         {
 718             edit_draw_this_char (edit, edit->curs1, edit->curs_row);
 719             edit_draw_this_char (edit, prev_curs, prev_curs_row);
 720         }
 721     }
 722
 723     edit->force = 0;
 724
 725     prev_curs_row = edit->curs_row;
 726     prev_curs = edit->curs1;
 727 }
 728
 729 /* --------------------------------------------------------------------------------------------- */
 730
 731 static inline void
 732 edit_render (WEdit * edit, int page, int row_start, int col_start, int row_end, int col_end)
 733 {
 734     if (page)                   /* if it was an expose event, 'page' would be set */
 735         edit->force |= REDRAW_PAGE | REDRAW_IN_BOUNDS;
 736
 737     if (edit->force & REDRAW_COMPLETELY)
 738         buttonbar_redraw (find_buttonbar (edit->widget.owner));
 739     render_edit_text (edit, row_start, col_start, row_end, col_end);
 740     /*
 741      * edit->force != 0 means a key was pending and the redraw
 742      * was halted, so next time we must redraw everything in case stuff
 743      * was left undrawn from a previous key press.
 744      */
 745     if (edit->force)
 746         edit->force |= REDRAW_PAGE;
 747 }
 748
 749 /* --------------------------------------------------------------------------------------------- */
 750 /*** public functions ****************************************************************************/
 751 /* --------------------------------------------------------------------------------------------- */
 752
 753 /** Draw the status line at the top of the widget. The size of the filename
 754  * field varies depending on the width of the screen and the length of
 755  * the filename. */
 756 void
 757 edit_status (WEdit * edit)
 758 {
 759     const int w = edit->widget.cols;
 760     const size_t status_size = w + 1;
 761     char *const status = g_malloc (status_size);
 762     int status_len;
 763     const char *fname = "";
 764     int fname_len;
 765     const int gap = 3;          /* between the filename and the status */
 766     const int right_gap = 5;    /* at the right end of the screen */
 767     const int preferred_fname_len = 16;
 768
 769     status_string (edit, status, status_size);
 770     status_len = (int) str_term_width1 (status);
 771
 772     if (edit->filename)
 773         fname = edit->filename;
 774     fname_len = str_term_width1 (fname);
 775     if (fname_len < preferred_fname_len)
 776         fname_len = preferred_fname_len;
 777
 778     if (fname_len + gap + status_len + right_gap >= w)
 779     {
 780         if (preferred_fname_len + gap + status_len + right_gap >= w)
 781             fname_len = preferred_fname_len;
 782         else
 783             fname_len = w - (gap + status_len + right_gap);
 784         fname = str_trunc (fname, fname_len);
 785     }
 786
 787     widget_move (edit, 0, 0);
 788     tty_setcolor (STATUSBAR_COLOR);
 789     printwstr (fname, fname_len + gap);
 790     printwstr (status, w - (fname_len + gap));
 791
 792     if (simple_statusbar && edit->widget.cols > 30)
 793     {
 794         size_t percent;
 795         if (edit->total_lines + 1 != 0)
 796             percent = (edit->curs_line + 1) * 100 / (edit->total_lines + 1);
 797         else
 798             percent = 100;
 799         widget_move (edit, 0, edit->widget.cols - 5);
 800         tty_printf (" %3d%%", percent);
 801     }
 802
 803     g_free (status);
 804 }
 805
 806 /* --------------------------------------------------------------------------------------------- */
 807 /** this scrolls the text so that cursor is on the screen */
 808 void
 809 edit_scroll_screen_over_cursor (WEdit * edit)
 810 {
 811     int p;
 812     int outby;
 813     int b_extreme, t_extreme, l_extreme, r_extreme;
 814
 815     if (edit->widget.lines <= 0 || edit->widget.cols <= 0)
 816         return;
 817
 818     edit->widget.cols -= EDIT_TEXT_HORIZONTAL_OFFSET + option_line_state_width;
 819     edit->widget.lines -= EDIT_TEXT_VERTICAL_OFFSET - 1;
 820
 821     r_extreme = EDIT_RIGHT_EXTREME;
 822     l_extreme = EDIT_LEFT_EXTREME;
 823     b_extreme = EDIT_BOTTOM_EXTREME;
 824     t_extreme = EDIT_TOP_EXTREME;
 825     if (edit->found_len)
 826     {
 827         b_extreme = max (edit->widget.lines / 4, b_extreme);
 828         t_extreme = max (edit->widget.lines / 4, t_extreme);
 829     }
 830     if (b_extreme + t_extreme + 1 > edit->widget.lines)
 831     {
 832         int n;
 833         n = b_extreme + t_extreme;
 834         b_extreme = (b_extreme * (edit->widget.lines - 1)) / n;
 835         t_extreme = (t_extreme * (edit->widget.lines - 1)) / n;
 836     }
 837     if (l_extreme + r_extreme + 1 > edit->widget.cols)
 838     {
 839         int n;
 840         n = l_extreme + t_extreme;
 841         l_extreme = (l_extreme * (edit->widget.cols - 1)) / n;
 842         r_extreme = (r_extreme * (edit->widget.cols - 1)) / n;
 843     }
 844     p = edit_get_col (edit) + edit->over_col;
 845     edit_update_curs_row (edit);
 846     outby = p + edit->start_col - edit->widget.cols + 1 + (r_extreme + edit->found_len);
 847     if (outby > 0)
 848         edit_scroll_right (edit, outby);
 849     outby = l_extreme - p - edit->start_col;
 850     if (outby > 0)
 851         edit_scroll_left (edit, outby);
 852     p = edit->curs_row;
 853     outby = p - edit->widget.lines + 1 + b_extreme;
 854     if (outby > 0)
 855         edit_scroll_downward (edit, outby);
 856     outby = t_extreme - p;
 857     if (outby > 0)
 858         edit_scroll_upward (edit, outby);
 859     edit_update_curs_row (edit);
 860
 861     edit->widget.lines += EDIT_TEXT_VERTICAL_OFFSET - 1;
 862     edit->widget.cols += EDIT_TEXT_HORIZONTAL_OFFSET + option_line_state_width;
 863 }
 864
 865 /* --------------------------------------------------------------------------------------------- */
 866
 867 void
 868 edit_render_keypress (WEdit * edit)
 869 {
 870     edit_render (edit, 0, 0, 0, 0, 0);
 871 }
 872
 873 /* --------------------------------------------------------------------------------------------- */