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/setup.h"          /* edit_tab_spacing */
  51
  52 #include "edit-impl.h"
  53 #include "edit-widget.h"
  54
  55 /*** global variables ****************************************************************************/
  56
  57 /* Toggles statusbar draw style */
  58 int simple_statusbar = 0;
  59
  60 int visible_tabs = 1, visible_tws = 1, visible_eol = 0;
  61
  62 /*** file scope macro definitions ****************************************************************/
  63
  64 #define MAX_LINE_LEN 1024
  65
  66 /* Text styles */
  67 #define MOD_ABNORMAL            (1 << 8)
  68 #define MOD_BOLD                (1 << 9)
  69 #define MOD_MARKED              (1 << 10)
  70 #define MOD_CURSOR              (1 << 11)
  71 #define MOD_WHITESPACE          (1 << 12)
  72
  73 #define FONT_OFFSET_X 0
  74 #define FONT_OFFSET_Y 0
  75 #define FIXED_FONT 1
  76 #define FONT_PIX_PER_LINE 1
  77 #define FONT_MEAN_WIDTH 1
  78
  79 #define edit_move(x,y) widget_move(edit, y, x);
  80
  81 #define key_pending(x) (!is_idle())
  82
  83
  84 /*** file scope type declarations ****************************************************************/
  85
  86 struct line_s
  87 {
  88     unsigned int ch;
  89     unsigned int style;
  90 };
  91
  92 /*** file scope variables ************************************************************************/
  93
  94 /*** file scope functions ************************************************************************/
  95 /* --------------------------------------------------------------------------------------------- */
  96
  97 static inline void
  98 status_string (WEdit * edit, char *s, int w)
  99 {
 100     char byte_str[16];
 101     unsigned char cur_byte = 0;
 102     unsigned int cur_utf = 0;
 103     int cw = 1;
 104
 105     /*
 106      * If we are at the end of file, print <EOF>,
 107      * otherwise print the current character as is (if printable),
 108      * as decimal and as hex.
 109      */
 110     if (edit->curs1 < edit->last_byte)
 111     {
 112         if (!edit->utf8)
 113         {
 114             cur_byte = edit_get_byte (edit, edit->curs1);
 115
 116             g_snprintf (byte_str, sizeof (byte_str), "%4d 0x%03X",
 117                         (int) cur_byte, (unsigned) cur_byte);
 118         }
 119         else
 120         {
 121             cur_utf = edit_get_utf (edit, edit->curs1, &cw);
 122             if (cw > 0)
 123             {
 124                 g_snprintf (byte_str, sizeof (byte_str), "%04d 0x%03X",
 125                             (unsigned) cur_utf, (unsigned) cur_utf);
 126             }
 127             else
 128             {
 129                 cur_utf = edit_get_byte (edit, edit->curs1);
 130                 g_snprintf (byte_str, sizeof (byte_str), "%04d 0x%03X",
 131                             (int) cur_utf, (unsigned) cur_utf);
 132             }
 133
 134         }
 135     }
 136     else
 137     {
 138         strcpy (byte_str, "<EOF>     ");
 139     }
 140
 141     /* The field lengths just prevent the status line from shortening too much */
 142     if (simple_statusbar)
 143         g_snprintf (s, w,
 144                     "%c%c%c%c %3ld %5ld/%ld %6ld/%ld %s %s",
 145                     edit->mark1 != edit->mark2 ? (edit->column_highlight ? 'C' : 'B') : '-',
 146                     edit->modified ? 'M' : '-',
 147                     macro_index < 0 ? '-' : 'R',
 148                     edit->overwrite == 0 ? '-' : 'O',
 149                     edit->curs_col + edit->over_col,
 150                     edit->curs_line + 1,
 151                     edit->total_lines + 1, edit->curs1, edit->last_byte, byte_str,
 152 #ifdef HAVE_CHARSET
 153                     mc_global.source_codepage >= 0 ? get_codepage_id (mc_global.source_codepage) : ""
 154 #else
 155                     ""
 156 #endif
 157             );
 158     else
 159         g_snprintf (s, w,
 160                     "[%c%c%c%c] %2ld L:[%3ld+%2ld %3ld/%3ld] *(%-4ld/%4ldb) %s  %s",
 161                     edit->mark1 != edit->mark2 ? (edit->column_highlight ? 'C' : 'B') : '-',
 162                     edit->modified ? 'M' : '-',
 163                     macro_index < 0 ? '-' : 'R',
 164                     edit->overwrite == 0 ? '-' : 'O',
 165                     edit->curs_col + edit->over_col,
 166                     edit->start_line + 1,
 167                     edit->curs_row,
 168                     edit->curs_line + 1,
 169                     edit->total_lines + 1, edit->curs1, edit->last_byte, byte_str,
 170 #ifdef HAVE_CHARSET
 171                     mc_global.source_codepage >= 0 ? get_codepage_id (mc_global.source_codepage) : ""
 172 #else
 173                     ""
 174 #endif
 175             );
 176 }
 177
 178 /* --------------------------------------------------------------------------------------------- */
 179
 180 static inline void
 181 printwstr (const char *s, int len)
 182 {
 183     if (len > 0)
 184         tty_printf ("%-*.*s", len, len, s);
 185 }
 186
 187 /* --------------------------------------------------------------------------------------------- */
 188
 189 static inline void
 190 print_to_widget (WEdit * edit, long row, int start_col, int start_col_real,
 191                  long end_col, struct line_s line[], char *status, int bookmarked)
 192 {
 193     struct line_s *p;
 194
 195     int x = start_col_real;
 196     int x1 = start_col + EDIT_TEXT_HORIZONTAL_OFFSET + option_line_state_width;
 197     int y = row + EDIT_TEXT_VERTICAL_OFFSET;
 198     int cols_to_skip = abs (x);
 199     int i;
 200
 201     tty_setcolor (EDITOR_NORMAL_COLOR);
 202     if (bookmarked != 0)
 203         tty_setcolor (bookmarked);
 204
 205     if (!show_right_margin)
 206     {
 207         tty_draw_hline (edit->widget.y + y, edit->widget.x + x1, ' ', end_col + 1 - start_col);
 208     }
 209     else if (edit->start_col < option_word_wrap_line_length)
 210     {
 211         tty_draw_hline (edit->widget.y + y,
 212                         edit->widget.x + x1, ' ', option_word_wrap_line_length - edit->start_col);
 213
 214         tty_setcolor (EDITOR_RIGHT_MARGIN_COLOR);
 215         tty_draw_hline (edit->widget.y + y,
 216                         edit->widget.x + x1 + option_word_wrap_line_length + edit->start_col,
 217                         ' ', end_col + 1 - start_col);
 218     }
 219
 220     if (option_line_state)
 221     {
 222         for (i = 0; i < LINE_STATE_WIDTH; i++)
 223             if (status[i] == '\0')
 224                 status[i] = ' ';
 225
 226         tty_setcolor (LINE_STATE_COLOR);
 227         edit_move (x1 + FONT_OFFSET_X - option_line_state_width, y + FONT_OFFSET_Y);
 228         tty_print_string (status);
 229     }
 230
 231     edit_move (x1 + FONT_OFFSET_X, y + FONT_OFFSET_Y);
 232     p = line;
 233     i = 1;
 234     while (p->ch)
 235     {
 236         int style;
 237         unsigned int textchar;
 238         int color;
 239
 240         if (cols_to_skip)
 241         {
 242             p++;
 243             cols_to_skip--;
 244             continue;
 245         }
 246
 247         style = p->style & 0xFF00;
 248         textchar = p->ch;
 249         color = p->style >> 16;
 250
 251         if (style & MOD_ABNORMAL)
 252         {
 253             /* Non-printable - use black background */
 254             color = 0;
 255         }
 256
 257         if (style & MOD_WHITESPACE)
 258         {
 259             if (style & MOD_MARKED)
 260             {
 261                 textchar = ' ';
 262                 tty_setcolor (EDITOR_MARKED_COLOR);
 263             }
 264             else
 265             {
 266 #if 0
 267                 if (color != EDITOR_NORMAL_COLOR)
 268                 {
 269                     textchar = ' ';
 270                     tty_lowlevel_setcolor (color);
 271                 }
 272                 else
 273 #endif
 274                     tty_setcolor (EDITOR_WHITESPACE_COLOR);
 275             }
 276         }
 277         else
 278         {
 279             if (style & MOD_BOLD)
 280             {
 281                 tty_setcolor (EDITOR_BOLD_COLOR);
 282             }
 283             else if (style & MOD_MARKED)
 284             {
 285                 tty_setcolor (EDITOR_MARKED_COLOR);
 286             }
 287             else
 288             {
 289                 tty_lowlevel_setcolor (color);
 290             }
 291         }
 292         if (show_right_margin)
 293         {
 294             if (i > option_word_wrap_line_length + edit->start_col)
 295                 tty_setcolor (EDITOR_RIGHT_MARGIN_COLOR);
 296             i++;
 297         }
 298         tty_print_anychar (textchar);
 299         p++;
 300     }
 301 }
 302
 303 /* --------------------------------------------------------------------------------------------- */
 304 /** b is a pointer to the beginning of the line */
 305
 306 static void
 307 edit_draw_this_line (WEdit * edit, long b, long row, long start_col, long end_col)
 308 {
 309     struct line_s line[MAX_LINE_LEN];
 310     struct line_s *p = line;
 311
 312     long m1 = 0, m2 = 0, q, c1, c2;
 313     int col, start_col_real;
 314     unsigned int c;
 315     int color;
 316     int abn_style;
 317     int i;
 318     int utf8lag = 0;
 319     unsigned int cur_line = 0;
 320     int book_mark = 0;
 321     char line_stat[LINE_STATE_WIDTH + 1];
 322
 323     if (row > edit->widget.lines - EDIT_TEXT_VERTICAL_OFFSET)
 324         return;
 325
 326     if (book_mark_query_color (edit, edit->start_line + row, BOOK_MARK_COLOR))
 327         book_mark = BOOK_MARK_COLOR;
 328     else if (book_mark_query_color (edit, edit->start_line + row, BOOK_MARK_FOUND_COLOR))
 329         book_mark = BOOK_MARK_FOUND_COLOR;
 330
 331     if (book_mark)
 332         abn_style = book_mark << 16;
 333     else
 334         abn_style = MOD_ABNORMAL;
 335
 336     end_col -= EDIT_TEXT_HORIZONTAL_OFFSET + option_line_state_width;
 337
 338     edit_get_syntax_color (edit, b - 1, &color);
 339     q = edit_move_forward3 (edit, b, start_col - edit->start_col, 0);
 340     start_col_real = (col = (int) edit_move_forward3 (edit, b, 0, q)) + edit->start_col;
 341     if (option_line_state)
 342     {
 343         cur_line = edit->start_line + row;
 344         if (cur_line <= (unsigned int) edit->total_lines)
 345         {
 346             g_snprintf (line_stat, LINE_STATE_WIDTH + 1, "%7i ", cur_line + 1);
 347         }
 348         else
 349         {
 350             memset (line_stat, ' ', LINE_STATE_WIDTH);
 351             line_stat[LINE_STATE_WIDTH] = '\0';
 352         }
 353         if (book_mark_query_color (edit, cur_line, BOOK_MARK_COLOR))
 354         {
 355             g_snprintf (line_stat, 2, "*");
 356         }
 357     }
 358
 359     if (col + 16 > -edit->start_col)
 360     {
 361         eval_marks (edit, &m1, &m2);
 362
 363         if (row <= edit->total_lines - edit->start_line)
 364         {
 365             long tws = 0;
 366             if (tty_use_colors () && visible_tws)
 367             {
 368                 tws = edit_eol (edit, b);
 369                 while (tws > b && ((c = edit_get_byte (edit, tws - 1)) == ' ' || c == '\t'))
 370                     tws--;
 371             }
 372
 373             while (col <= end_col - edit->start_col)
 374             {
 375                 int cw = 1;
 376
 377                 p->ch = 0;
 378                 p->style = 0;
 379                 if (q == edit->curs1)
 380                     p->style |= MOD_CURSOR;
 381                 if (q >= m1 && q < m2)
 382                 {
 383                     if (edit->column_highlight)
 384                     {
 385                         int x;
 386                         x = edit_move_forward3 (edit, b, 0, q);
 387                         c1 = min (edit->column1, edit->column2);
 388                         c2 = max (edit->column1, edit->column2);
 389                         if (x >= c1 && x < c2)
 390                             p->style |= MOD_MARKED;
 391                     }
 392                     else
 393                         p->style |= MOD_MARKED;
 394                 }
 395                 if (q == edit->bracket)
 396                     p->style |= MOD_BOLD;
 397                 if (q >= edit->found_start && q < edit->found_start + edit->found_len)
 398                     p->style |= MOD_BOLD;
 399
 400                 if (!edit->utf8)
 401                 {
 402                     c = edit_get_byte (edit, q);
 403                 }
 404                 else
 405                 {
 406                     c = edit_get_utf (edit, q, &cw);
 407                 }
 408                 /* we don't use bg for mc - fg contains both */
 409                 if (book_mark)
 410                 {
 411                     p->style |= book_mark << 16;
 412                 }
 413                 else
 414                 {
 415                     edit_get_syntax_color (edit, q, &color);
 416                     p->style |= color << 16;
 417                 }
 418                 switch (c)
 419                 {
 420                 case '\n':
 421                     col = (end_col + utf8lag) - edit->start_col + 1;    /* quit */
 422                     if (tty_use_colors() && visible_eol) {
 423                         p->ch = widget_edit_eol_char;
 424                         p->style |= MOD_WHITESPACE;
 425                         ++p;
 426                         ++col;
 427                     }
 428                     break;
 429                 case '\t':
 430                     i = TAB_SIZE - ((int) col % TAB_SIZE);
 431                     col += i;
 432                     if (tty_use_colors () &&
 433                         ((visible_tabs || (visible_tws && q >= tws)) && enable_show_tabs_tws))
 434                     {
 435                         if (p->style & MOD_MARKED)
 436                             c = p->style;
 437                         else if (book_mark)
 438                             c |= book_mark << 16;
 439                         else
 440                             c = p->style | MOD_WHITESPACE;
 441                         if (i > 2)
 442                         {
 443                             p->ch = widget_edit_tab_first;
 444                             p->style = c;
 445                             p++;
 446                             while (--i > 1)
 447                             {
 448                                 p->ch = widget_edit_tab_middle;
 449                                 p->style = c;
 450                                 p++;
 451                             }
 452                             p->ch = widget_edit_tab_last;
 453                             p->style = c;
 454                             p++;
 455                         }
 456                         else if (i > 1)
 457                         {
 458                             p->ch = widget_edit_tab_first;
 459                             p->style = c;
 460                             p++;
 461                             p->ch = widget_edit_tab_last;
 462                             p->style = c;
 463                             p++;
 464                         }
 465                         else
 466                         {
 467                             p->ch = widget_edit_tab_last;
 468                             p->style = c;
 469                             p++;
 470                         }
 471                     }
 472                     else if (tty_use_colors () && visible_tws && q >= tws && enable_show_tabs_tws)
 473                     {
 474                         p->ch = '.';
 475                         p->style |= MOD_WHITESPACE;
 476                         c = p->style & ~MOD_CURSOR;
 477                         p++;
 478                         while (--i)
 479                         {
 480                             p->ch = ' ';
 481                             p->style = c;
 482                             p++;
 483                         }
 484                     }
 485                     else
 486                     {
 487                         p->ch |= ' ';
 488                         c = p->style & ~MOD_CURSOR;
 489                         p++;
 490                         while (--i)
 491                         {
 492                             p->ch = ' ';
 493                             p->style = c;
 494                             p++;
 495                         }
 496                     }
 497                     break;
 498                 case ' ':
 499                     if (tty_use_colors () && visible_tws && q >= tws && enable_show_tabs_tws)
 500                     {
 501                         p->ch = '.';
 502                         p->style |= MOD_WHITESPACE;
 503                         p++;
 504                         col++;
 505                         break;
 506                     }
 507                     /* fallthrough */
 508                 default:
 509 #ifdef HAVE_CHARSET
 510                     if (mc_global.utf8_display)
 511                     {
 512                         if (!edit->utf8)
 513                         {
 514                             c = convert_from_8bit_to_utf_c ((unsigned char) c, edit->converter);
 515                         }
 516                     }
 517                     else if (edit->utf8)
 518                         c = convert_from_utf_to_current_c (c, edit->converter);
 519                     else
 520 #endif
 521                         c = convert_to_display_c (c);
 522
 523                     /* Caret notation for control characters */
 524                     if (c < 32)
 525                     {
 526                         p->ch = '^';
 527                         p->style = abn_style;
 528                         p++;
 529                         p->ch = c + 0x40;
 530                         p->style = abn_style;
 531                         p++;
 532                         col += 2;
 533                         break;
 534                     }
 535                     if (c == 127)
 536                     {
 537                         p->ch = '^';
 538                         p->style = abn_style;
 539                         p++;
 540                         p->ch = '?';
 541                         p->style = abn_style;
 542                         p++;
 543                         col += 2;
 544                         break;
 545                     }
 546                     if (!edit->utf8)
 547                     {
 548                         if ((mc_global.utf8_display && g_unichar_isprint (c)) ||
 549                             (!mc_global.utf8_display && is_printable (c)))
 550                         {
 551                             p->ch = c;
 552                             p++;
 553                         }
 554                         else
 555                         {
 556                             p->ch = '.';
 557                             p->style = abn_style;
 558                             p++;
 559                         }
 560                     }
 561                     else
 562                     {
 563                         if (g_unichar_isprint (c))
 564                         {
 565                             p->ch = c;
 566                             p++;
 567                         }
 568                         else
 569                         {
 570                             p->ch = '.';
 571                             p->style = abn_style;
 572                             p++;
 573                         }
 574                     }
 575                     col++;
 576                     break;
 577                 }               /* case */
 578
 579                 q++;
 580                 if (cw > 1)
 581                 {
 582                     q += cw - 1;
 583                 }
 584             }
 585         }
 586     }
 587     else
 588     {
 589         start_col_real = start_col = 0;
 590     }
 591
 592     p->ch = '\0';
 593
 594     print_to_widget (edit, row, start_col, start_col_real, end_col, line, line_stat, book_mark);
 595 }
 596
 597 /* --------------------------------------------------------------------------------------------- */
 598
 599 static inline void
 600 edit_draw_this_char (WEdit * edit, long curs, long row)
 601 {
 602     int b = edit_bol (edit, curs);
 603     edit_draw_this_line (edit, b, row, 0, edit->widget.cols - 1);
 604 }
 605
 606 /* --------------------------------------------------------------------------------------------- */
 607 /** cursor must be in screen for other than REDRAW_PAGE passed in force */
 608
 609 static inline void
 610 render_edit_text (WEdit * edit, long start_row, long start_column, long end_row, long end_column)
 611 {
 612     long row = 0, curs_row;
 613     static long prev_curs_row = 0;
 614     static long prev_curs = 0;
 615
 616     int force = edit->force;
 617     long b;
 618
 619     /*
 620      * If the position of the page has not moved then we can draw the cursor
 621      * character only.  This will prevent line flicker when using arrow keys.
 622      */
 623     if ((!(force & REDRAW_CHAR_ONLY)) || (force & REDRAW_PAGE))
 624     {
 625         if (!(force & REDRAW_IN_BOUNDS))
 626         {                       /* !REDRAW_IN_BOUNDS means to ignore bounds and redraw whole rows */
 627             start_row = 0;
 628             end_row = edit->widget.lines - 1;
 629             start_column = 0;
 630             end_column = edit->widget.cols - 1;
 631         }
 632         if (force & REDRAW_PAGE)
 633         {
 634             row = start_row;
 635             b = edit_move_forward (edit, edit->start_display, start_row, 0);
 636             while (row <= end_row)
 637             {
 638                 if (key_pending (edit))
 639                     return;
 640                 edit_draw_this_line (edit, b, row, start_column, end_column);
 641                 b = edit_move_forward (edit, b, 1, 0);
 642                 row++;
 643             }
 644         }
 645         else
 646         {
 647             curs_row = edit->curs_row;
 648
 649             if (force & REDRAW_BEFORE_CURSOR)
 650             {
 651                 if (start_row < curs_row)
 652                 {
 653                     long upto = curs_row - 1 <= end_row ? curs_row - 1 : end_row;
 654                     row = start_row;
 655                     b = edit->start_display;
 656                     while (row <= upto)
 657                     {
 658                         if (key_pending (edit))
 659                             return;
 660                         edit_draw_this_line (edit, b, row, start_column, end_column);
 661                         b = edit_move_forward (edit, b, 1, 0);
 662                     }
 663                 }
 664             }
 665             /*          if (force & REDRAW_LINE)          ---> default */
 666             b = edit_bol (edit, edit->curs1);
 667             if (curs_row >= start_row && curs_row <= end_row)
 668             {
 669                 if (key_pending (edit))
 670                     return;
 671                 edit_draw_this_line (edit, b, curs_row, start_column, end_column);
 672             }
 673             if (force & REDRAW_AFTER_CURSOR)
 674             {
 675                 if (end_row > curs_row)
 676                 {
 677                     row = curs_row + 1 < start_row ? start_row : curs_row + 1;
 678                     b = edit_move_forward (edit, b, 1, 0);
 679                     while (row <= end_row)
 680                     {
 681                         if (key_pending (edit))
 682                             return;
 683                         edit_draw_this_line (edit, b, row, start_column, end_column);
 684                         b = edit_move_forward (edit, b, 1, 0);
 685                         row++;
 686                     }
 687                 }
 688             }
 689             if (force & REDRAW_LINE_ABOVE && curs_row >= 1)
 690             {
 691                 row = curs_row - 1;
 692                 b = edit_move_backward (edit, edit_bol (edit, edit->curs1), 1);
 693                 if (row >= start_row && row <= end_row)
 694                 {
 695                     if (key_pending (edit))
 696                         return;
 697                     edit_draw_this_line (edit, b, row, start_column, end_column);
 698                 }
 699             }
 700             if (force & REDRAW_LINE_BELOW && row < edit->widget.lines - 1)
 701             {
 702                 row = curs_row + 1;
 703                 b = edit_bol (edit, edit->curs1);
 704                 b = edit_move_forward (edit, b, 1, 0);
 705                 if (row >= start_row && row <= end_row)
 706                 {
 707                     if (key_pending (edit))
 708                         return;
 709                     edit_draw_this_line (edit, b, row, start_column, end_column);
 710                 }
 711             }
 712         }
 713     }
 714     else
 715     {
 716         if (prev_curs_row < edit->curs_row)
 717         {                       /* with the new text highlighting, we must draw from the top down */
 718             edit_draw_this_char (edit, prev_curs, prev_curs_row);
 719             edit_draw_this_char (edit, edit->curs1, edit->curs_row);
 720         }
 721         else
 722         {
 723             edit_draw_this_char (edit, edit->curs1, edit->curs_row);
 724             edit_draw_this_char (edit, prev_curs, prev_curs_row);
 725         }
 726     }
 727
 728     edit->force = 0;
 729
 730     prev_curs_row = edit->curs_row;
 731     prev_curs = edit->curs1;
 732 }
 733
 734 /* --------------------------------------------------------------------------------------------- */
 735
 736 static inline void
 737 edit_render (WEdit * edit, int page, int row_start, int col_start, int row_end, int col_end)
 738 {
 739     if (page)                   /* if it was an expose event, 'page' would be set */
 740         edit->force |= REDRAW_PAGE | REDRAW_IN_BOUNDS;
 741
 742     if (edit->force & REDRAW_COMPLETELY)
 743         buttonbar_redraw (find_buttonbar (edit->widget.owner));
 744     render_edit_text (edit, row_start, col_start, row_end, col_end);
 745     /*
 746      * edit->force != 0 means a key was pending and the redraw
 747      * was halted, so next time we must redraw everything in case stuff
 748      * was left undrawn from a previous key press.
 749      */
 750     if (edit->force)
 751         edit->force |= REDRAW_PAGE;
 752 }
 753
 754 /* --------------------------------------------------------------------------------------------- */
 755 /*** public functions ****************************************************************************/
 756 /* --------------------------------------------------------------------------------------------- */
 757
 758 /** Draw the status line at the top of the widget. The size of the filename
 759  * field varies depending on the width of the screen and the length of
 760  * the filename. */
 761 void
 762 edit_status (WEdit * edit)
 763 {
 764     const int w = edit->widget.cols;
 765     const size_t status_size = w + 1;
 766     char *const status = g_malloc (status_size);
 767     int status_len;
 768     const char *fname = "";
 769     int fname_len;
 770     const int gap = 3;          /* between the filename and the status */
 771     const int right_gap = 5;    /* at the right end of the screen */
 772     const int preferred_fname_len = 16;
 773
 774     status_string (edit, status, status_size);
 775     status_len = (int) str_term_width1 (status);
 776
 777     if (edit->filename)
 778         fname = edit->filename;
 779     fname_len = str_term_width1 (fname);
 780     if (fname_len < preferred_fname_len)
 781         fname_len = preferred_fname_len;
 782
 783     if (fname_len + gap + status_len + right_gap >= w)
 784     {
 785         if (preferred_fname_len + gap + status_len + right_gap >= w)
 786             fname_len = preferred_fname_len;
 787         else
 788             fname_len = w - (gap + status_len + right_gap);
 789         fname = str_trunc (fname, fname_len);
 790     }
 791
 792     widget_move (edit, 0, 0);
 793     tty_setcolor (STATUSBAR_COLOR);
 794     printwstr (fname, fname_len + gap);
 795     printwstr (status, w - (fname_len + gap));
 796
 797     if (simple_statusbar && edit->widget.cols > 30)
 798     {
 799         size_t percent;
 800         if (edit->total_lines + 1 != 0)
 801             percent = (edit->curs_line + 1) * 100 / (edit->total_lines + 1);
 802         else
 803             percent = 100;
 804         widget_move (edit, 0, edit->widget.cols - 5);
 805         tty_printf (" %3d%%", percent);
 806     }
 807
 808     g_free (status);
 809 }
 810
 811 /* --------------------------------------------------------------------------------------------- */
 812 /** this scrolls the text so that cursor is on the screen */
 813 void
 814 edit_scroll_screen_over_cursor (WEdit * edit)
 815 {
 816     int p;
 817     int outby;
 818     int b_extreme, t_extreme, l_extreme, r_extreme;
 819
 820     if (edit->widget.lines <= 0 || edit->widget.cols <= 0)
 821         return;
 822
 823     edit->widget.cols -= EDIT_TEXT_HORIZONTAL_OFFSET + option_line_state_width;
 824     edit->widget.lines -= EDIT_TEXT_VERTICAL_OFFSET - 1;
 825
 826     r_extreme = EDIT_RIGHT_EXTREME;
 827     l_extreme = EDIT_LEFT_EXTREME;
 828     b_extreme = EDIT_BOTTOM_EXTREME;
 829     t_extreme = EDIT_TOP_EXTREME;
 830     if (edit->found_len)
 831     {
 832         b_extreme = max (edit->widget.lines / 4, b_extreme);
 833         t_extreme = max (edit->widget.lines / 4, t_extreme);
 834     }
 835     if (b_extreme + t_extreme + 1 > edit->widget.lines)
 836     {
 837         int n;
 838         n = b_extreme + t_extreme;
 839         b_extreme = (b_extreme * (edit->widget.lines - 1)) / n;
 840         t_extreme = (t_extreme * (edit->widget.lines - 1)) / n;
 841     }
 842     if (l_extreme + r_extreme + 1 > edit->widget.cols)
 843     {
 844         int n;
 845         n = l_extreme + t_extreme;
 846         l_extreme = (l_extreme * (edit->widget.cols - 1)) / n;
 847         r_extreme = (r_extreme * (edit->widget.cols - 1)) / n;
 848     }
 849     p = edit_get_col (edit) + edit->over_col;
 850     edit_update_curs_row (edit);
 851     outby = p + edit->start_col - edit->widget.cols + 1 + (r_extreme + edit->found_len);
 852     if (outby > 0)
 853         edit_scroll_right (edit, outby);
 854     outby = l_extreme - p - edit->start_col;
 855     if (outby > 0)
 856         edit_scroll_left (edit, outby);
 857     p = edit->curs_row;
 858     outby = p - edit->widget.lines + 1 + b_extreme;
 859     if (outby > 0)
 860         edit_scroll_downward (edit, outby);
 861     outby = t_extreme - p;
 862     if (outby > 0)
 863         edit_scroll_upward (edit, outby);
 864     edit_update_curs_row (edit);
 865
 866     edit->widget.lines += EDIT_TEXT_VERTICAL_OFFSET - 1;
 867     edit->widget.cols += EDIT_TEXT_HORIZONTAL_OFFSET + option_line_state_width;
 868 }
 869
 870 /* --------------------------------------------------------------------------------------------- */
 871
 872 void
 873 edit_render_keypress (WEdit * edit)
 874 {
 875     edit_render (edit, 0, 0, 0, 0, 0);
 876 }
 877
 878 /* --------------------------------------------------------------------------------------------- */