| blob | 04fd56b3a48afef61e1fff0607c3514d159eb448 |
2 /*******************************************************************************
3 * *
4 * textDisp.c - Display text from a text buffer *
5 * *
6 * Copyright (C) 1999 Mark Edel *
7 * *
8 * This is free software; you can redistribute it and/or modify it under the *
9 * terms of the GNU General Public License as published by the Free Software *
10 * Foundation; either version 2 of the License, or (at your option) any later *
11 * version. *
12 * *
13 * This software is distributed in the hope that it will be useful, but WITHOUT *
14 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or *
15 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License *
16 * for more details. *
17 * *
18 * You should have received a copy of the GNU General Public License along with *
19 * software; if not, write to the Free Software Foundation, Inc., 59 Temple *
20 * Place, Suite 330, Boston, MA 02111-1307 USA *
21 * *
22 * Nirvana Text Editor *
23 * June 15, 1995 *
24 * *
25 * Written by Mark Edel *
26 * *
27 *******************************************************************************/
29 #ifdef HAVE_CONFIG_H
31 #endif
42 #include <stdio.h>
43 #include <stdlib.h>
44 #include <string.h>
45 #include <limits.h>
46 #ifdef VMS
48 #else
49 #ifndef __MVS__
50 #include <sys/param.h>
51 #endif
54 #include <Xm/Xm.h>
55 #include <Xm/ScrolledW.h>
56 #include <Xm/ScrollBar.h>
57 #include <Xm/Label.h>
58 #include <X11/Shell.h>
60 #ifdef HAVE_DEBUG_H
62 #endif
64 #define TOP_MARGIN 1
65 #define BOTTOM_MARGIN 1
66 #define LEFT_MARGIN 3
67 #define RIGHT_MARGIN 3
69 /* Masks for text drawing methods. These are or'd together to form an
70 integer which describes what drawing calls to use to draw a string */
71 #define FILL_SHIFT 8
72 #define SECONDARY_SHIFT 9
73 #define PRIMARY_SHIFT 10
74 #define HIGHLIGHT_SHIFT 11
75 #define STYLE_LOOKUP_SHIFT 0
76 #define BACKLIGHT_SHIFT 12
78 #define FILL_MASK (1 << FILL_SHIFT)
79 #define SECONDARY_MASK (1 << SECONDARY_SHIFT)
80 #define PRIMARY_MASK (1 << PRIMARY_SHIFT)
81 #define HIGHLIGHT_MASK (1 << HIGHLIGHT_SHIFT)
82 #define STYLE_LOOKUP_MASK (0xff << STYLE_LOOKUP_SHIFT)
83 #define BACKLIGHT_MASK (0xff << BACKLIGHT_SHIFT)
85 #define RANGESET_SHIFT (20)
86 #define RANGESET_MASK (0x3F << RANGESET_SHIFT)
88 /* If you use both 32-Bit Style mask layout:
89 Bits +----------------+----------------+----------------+----------------+
90 hex |1F1E1D1C1B1A1918|1716151413121110| F E D C B A 9 8| 7 6 5 4 3 2 1 0|
91 dec |3130292827262524|2322212019181716|151413121110 9 8| 7 6 5 4 3 2 1 0|
92 +----------------+----------------+----------------+----------------+
93 Type | r r| r r r r b b b b| b b b b H 1 2 F| s s s s s s s s|
94 +----------------+----------------+----------------+----------------+
95 where: s - style lookup value (8 bits)
96 F - fill (1 bit)
97 2 - secondary selection (1 bit)
98 1 - primary selection (1 bit)
99 H - highlight (1 bit)
100 b - backlighting index (8 bits)
101 r - rangeset index (6 bits)
102 This leaves 6 "unused" bits */
104 /* Maximum displayable line length (how many characters will fit across the
105 widest window). This amount of memory is temporarily allocated from the
106 stack in the redisplayLine routine for drawing strings */
107 #define MAX_DISP_LINE_LEN 1000
109 /* Macro for getting the TextPart from a textD */
110 #define TEXT_OF_TEXTD(t) (((TextWidget)((t)->w))->text)
191 {
193 XGCValues gcValues;
266 /* Attach an event handler to the widget so we can know the visibility
267 (used for choosing the fastest drawing method) */
271 /* Attach the callback to the text buffer for receiving modification
272 information */
276 }
278 /* Initialize the scroll bars and attach movement callbacks */
285 }
293 }
295 /* Update the display to reflect the contents of the buffer */
299 /* Decide if the horizontal scroll bar needs to be visible */
303 }
305 /*
306 ** Free a text display and release its associated memory. Note, the text
307 ** BUFFER that the text display displays is a separate entity and is not
308 ** freed, nor are the style buffer or style table.
309 */
311 {
323 }
327 }
329 /*
330 ** Attach a text buffer to display, replacing the current buffer (if any)
331 */
333 {
334 /* If the text display is already displaying a buffer, clear it off
335 of the display and remove our callback from it */
340 }
342 /* Add the buffer to the display, and attach a callback to the buffer for
343 receiving modification information when the buffer contents change */
348 /* Update the display */
350 }
352 /*
353 ** return the displayed text buffer
354 */
356 {
358 }
360 /*
361 ** Attach (or remove) highlight information in text display and redisplay.
362 ** Highlighting information consists of a style buffer which parallels the
363 ** normal text buffer, but codes font and color information for the display;
364 ** a style table which translates style buffer codes (indexed by buffer
365 ** character - 65 (ASCII code for 'A')) into fonts and colors; and a callback
366 ** mechanism for as-needed highlighting, triggered by a style buffer entry of
367 ** "unfinishedStyle". Style buffer can trigger additional redisplay during
368 ** a normal buffer modification if the buffer contains a primary selection
369 ** (see extendRangeForStyleMods for more information on this protocol).
370 **
371 ** Style buffers, tables and their associated memory are managed by the caller.
372 */
376 {
384 /* Call TextDSetFont to combine font information from style table and
385 primary font, adjust font-related parameters, and then redisplay */
387 }
390 /* Change the (non syntax-highlit) colors */
394 {
395 XGCValues values;
398 /* Update the stored pixels */
417 /* Change the cursor GC (the cursor GC is not shared). */
421 /* Redisplay */
425 }
427 /*
428 ** Change the (non highlight) font
429 */
431 {
437 XGCValues values;
440 /* If font size changes, cursor will be redrawn in a new position */
443 /* If there is a (syntax highlighting) style table in use, find the new
444 maximum font height for this text display */
451 }
455 /* If all of the current fonts are fixed and match in width, compute */
466 }
467 }
470 /* Don't let the height dip below one line, or bad things can happen */
474 /* Change the font. In most cases, this means re-allocating the
475 affected GCs (they are shared with other widgets, and if the primary
476 font changes, must be re-allocated to change it). Unfortunately,
477 this requres recovering all of the colors from the existing GCs */
500 /* Do a full resize to force recalculation of font related parameters */
506 /* if the shell window doesn't get resized, and the new fonts are
507 of smaller sizes, sometime we get some residual text on the
508 blank space at the bottom part of text area. Clear it here. */
513 /* Redisplay */
517 /* Clean up line number area in case spacing has changed */
519 }
522 {
531 }
532 }
533 }
535 }
538 {
547 }
548 }
549 }
551 }
553 /*
554 ** Change the size of the displayed text area
555 */
557 {
568 /* In continuous wrap mode, a change in width affects the total number of
569 lines in the buffer, and can leave the top line number incorrect, and
570 the top character no longer pointing at a valid line start */
574 True);
579 }
581 /* reallocate and update the line starts array, which may have changed
582 size and/or contents. (contents can change in continuous wrap mode
583 when the width changes, even without a change in height) */
587 }
592 /* if the window became shorter, there may be partially drawn
593 text left at the bottom edge, which must be cleaned up */
599 /* if the window became taller, there may be an opportunity to display
600 more text by scrolling down */
607 /* Update the scroll bar page increment size (as well as other scroll
608 bar parameters. If updating the horizontal range caused scrolling,
609 redraw */
614 /* If a full redraw is needed */
619 /* Decide if the horizontal scroll bar needs to be visible */
622 /* Refresh the line number display to draw more line numbers, or
623 erase extras */
626 /* Redraw the calltip */
628 }
630 /*
631 ** Refresh a rectangle of the text display. left and top are in coordinates of
632 ** the text drawing window
633 */
636 {
639 /* find the line number range of the display */
644 /* If the graphics contexts are shared using XtAllocateGC, their
645 clipping rectangles may have changed since the last use */
648 /* draw the lines of text */
652 /* draw the line numbers if exposed area includes them */
655 }
657 /*
658 ** Refresh all of the text between buffer positions "start" and "end"
659 ** not including the character at the position "end".
660 ** If end points beyond the end of the buffer, refresh the whole display
661 ** after pos, including blank lines which are not technically part of
662 ** any range of characters.
663 */
665 {
668 /* If the range is outside of the displayed text, just return */
673 /* Clean up the starting and ending values */
679 /* Get the starting and ending lines */
688 /* shouldn't happen */
690 }
691 }
693 /* Get the starting and ending positions within the lines */
700 else
703 /* Reset the clipping rectangles for the drawing GCs which are shared
704 using XtAllocateGC, and may have changed since the last use */
707 /* If the starting and ending lines are the same, redisplay the single
708 line between "start" and "end" */
712 }
714 /* Redisplay the first line from "start" */
717 /* Redisplay the lines in between at their full width */
721 /* Redisplay the last line to "end" */
723 }
725 /*
726 ** Set the scroll position of the text display vertically by line number and
727 ** horizontally by pixel offset from the left margin
728 */
730 {
734 /* Limit the requested scroll position to allowable values */
739 vPadding)))
750 }
752 /*
753 ** Get the current scroll position for the text display, in terms of line
754 ** number of the top line and horizontal pixel offset from the left margin
755 */
757 {
760 }
762 /*
763 ** Set the position of the text insertion cursor for text display "textD"
764 */
766 {
767 /* make sure new position is ok, do nothing if it hasn't changed */
773 /* cursor movement cancels vertical cursor motion column */
776 /* erase the cursor at it's previous position */
779 /* draw it at its new position */
783 }
786 {
793 }
796 {
800 }
801 }
804 {
809 }
812 {
816 /* wrapping can change change the total number of lines, re-count */
819 /* changing wrap margins wrap or changing from wrapped mode to non-wrapped
820 can leave the character at the top no longer at a line start, and/or
821 change the line number */
826 /* update the line starts array */
830 /* Update the scroll bar page increment size (as well as other scroll
831 bar parameters) */
835 /* Decide if the horizontal scroll bar needs to be visible */
838 /* Do a full redraw */
841 }
844 {
846 }
848 /*
849 ** Insert "text" at the current cursor location. This has the same
850 ** effect as inserting the text into the buffer using BufInsert and
851 ** then moving the insert position after the newly inserted text, except
852 ** that it's optimized to do less redrawing.
853 */
855 {
861 }
863 /*
864 ** Insert "text" (which must not contain newlines), overstriking the current
865 ** cursor location.
866 */
868 {
876 /* determine how many displayed character positions are covered */
883 /* find which characters to remove, and if necessary generate additional
884 padding to make up for removed control characters at the end */
894 p++;
898 p++;
904 }
906 }
907 }
915 }
917 /*
918 ** Translate window coordinates to the nearest text cursor position.
919 */
921 {
923 }
925 /*
926 ** Translate window coordinates to the nearest character cell.
927 */
929 {
931 }
933 /*
934 ** Translate window coordinates to the nearest row and column number for
935 ** positioning the cursor. This, of course, makes no sense when the font
936 ** is proportional, since there are no absolute columns.
937 */
940 {
942 }
944 /*
945 ** Translate line and column to the nearest row and column number for
946 ** positioning the cursor. This, of course, makes no sense when the font
947 ** is proportional, since there are no absolute columns.
948 */
950 {
955 /* Count lines */
962 }
964 /* If line is beyond end of buffer, position at last character in buffer */
967 }
969 /* Start character index at zero */
972 /* Only have to count columns if column isn't zero (or negative) */
974 /* Count columns, expanding each character */
983 }
985 /* If the column is in the middle of an expanded character, put cursor
986 * in front of character if in first half of character, and behind
987 * character if in last half of character
988 */
990 charIndex++;
992 /* If we are beyond the end of the line, back up one space */
994 }
996 /* Position is the start of the line plus the index into line buffer */
998 }
1000 /*
1001 ** Translate a buffer text position to the XY location where the center
1002 ** of the cursor would be positioned to point to that character. Returns
1003 ** False if the position is not displayed because it is VERTICALLY out
1004 ** of view. If the position is horizontally out of view, returns the
1005 ** x coordinate where the position would be if it were visible.
1006 */
1008 {
1013 /* If position is not displayed, return false */
1018 /* Calculate y coordinate */
1024 /* Get the text, length, and buffer position of the line. If the position
1025 is beyond the end of the buffer and should be at the first position on
1026 the first empty line, don't try to get or scan the text */
1031 }
1035 /* Step through character positions from the beginning of the line
1036 to "pos" to calculate the x coordinate */
1046 }
1050 }
1052 /*
1053 ** If the text widget is maintaining a line number count appropriate to "pos"
1054 ** return the line and column numbers of pos, otherwise return False. If
1055 ** continuous wrap mode is on, returns the absolute line number (as opposed to
1056 ** the wrapped line number which is used for scrolling). THIS ROUTINE ONLY
1057 ** WORKS FOR DISPLAYED LINES AND, IN CONTINUOUS WRAP MODE, ONLY WHEN THE
1058 ** ABSOLUTE LINE NUMBER IS BEING MAINTAINED. Otherwise, it returns False.
1059 */
1061 {
1064 /* In continuous wrap mode, the absolute (non-wrapped) line count is
1065 maintained separately, as needed. Only return it if we're actually
1066 keeping track of it and pos is in the displayed text */
1075 }
1077 /* Only return the data if pos is within the displayed text */
1083 }
1085 /*
1086 ** Return True if position (x, y) is inside of the primary selection
1087 */
1089 {
1097 }
1099 /*
1100 ** Correct a column number based on an unconstrained position (as returned by
1101 ** TextDXYToUnconstrainedPosition) to be relative to the last actual newline
1102 ** in the buffer before the row and column position given, rather than the
1103 ** last line start created by line wrapping. This is an adapter
1104 ** for rectangular selections and code written before continuous wrap mode,
1105 ** which thinks that the unconstrained column is the number of characters
1106 ** from the last newline. Obviously this is time consuming, because it
1107 ** invloves character re-counting.
1108 */
1110 {
1120 }
1122 /*
1123 ** Correct a row number from an unconstrained position (as returned by
1124 ** TextDXYToUnconstrainedPosition) to a straight number of newlines from the
1125 ** top line of the display. Because rectangular selections are based on
1126 ** newlines, rather than display wrapping, and anywhere a rectangular selection
1127 ** needs a row, it needs it in terms of un-wrapped lines.
1128 */
1130 {
1135 }
1137 /*
1138 ** Scroll the display to bring insertion cursor into view.
1139 **
1140 ** Note: it would be nice to be able to do this without counting lines twice
1141 ** (setScroll counts them too) and/or to count from the most efficient
1142 ** starting point, but the efficiency of this routine is not as important to
1143 ** the overall performance of the text display.
1144 */
1146 {
1155 /* Don't do padding if this is a mouse operation */
1159 /* Find the new top line number */
1162 /* linesFromTop = 0; */
1170 topLine++;
1173 /* Avoid extra counting if cursorVPadding is disabled */
1177 }
1181 }
1184 /* Keep the cursor away from the top or bottom of screen. */
1193 }
1194 }
1196 /* Find the new setting for horizontal offset (this is a bit ungraceful).
1197 If the line is visible, just use TextDPositionToXY to get the position
1198 to scroll to, otherwise, do the vertical scrolling first, then the
1199 horizontal */
1204 }
1210 /* Do the scroll */
1212 }
1214 /*
1215 ** Return the current preferred column along with the current
1216 ** visible line index (-1 if not visible) and the lineStartPos
1217 ** of the current insert position.
1218 */
1220 {
1223 /* Find the position of the start of the line. Use the line starts array
1224 if possible, to avoid unbounded line-counting in continuous wrap mode */
1227 }
1231 }
1233 /* Decide what column to move to, if there's a preferred column use that */
1237 }
1239 /*
1240 ** Return the insert position of the requested column given
1241 ** the lineStartPos.
1242 */
1244 {
1250 }
1252 }
1254 /*
1255 ** Cursor movement functions
1256 */
1258 {
1263 }
1266 {
1271 }
1274 {
1277 /* Find the position of the start of the line. Use the line starts array
1278 if possible, to avoid unbounded line-counting in continuous wrap mode */
1287 }
1291 /* Decide what column to move to, if there's a preferred column use that */
1295 /* count forward from the start of the previous line to reach the column */
1300 else
1306 /* move the cursor */
1309 /* if a preferred column wasn't aleady established, establish it */
1313 }
1315 {
1328 }
1333 else
1342 }
1344 /*
1345 ** Same as BufCountLines, but takes in to account wrapping if wrapping is
1346 ** turned on. If the caller knows that startPos is at a line start, it
1347 ** can pass "startPosIsLineStart" as True to make the call more efficient
1348 ** by avoiding the additional step of scanning back to the last newline.
1349 */
1352 {
1355 /* If we're not wrapping use simple (and more efficient) BufCountLines */
1363 }
1365 /*
1366 ** Same as BufCountForwardNLines, but takes in to account line breaks when
1367 ** wrapping is turned on. If the caller knows that startPos is at a line start,
1368 ** it can pass "startPosIsLineStart" as True to make the call more efficient
1369 ** by avoiding the additional step of scanning back to the last newline.
1370 */
1373 {
1376 /* if we're not wrapping use more efficient BufCountForwardNLines */
1380 /* wrappedLineCounter can't handle the 0 lines case */
1384 /* use the common line counting routine to count forward */
1389 }
1391 /*
1392 ** Same as BufEndOfLine, but takes in to account line breaks when wrapping
1393 ** is turned on. If the caller knows that startPos is at a line start, it
1394 ** can pass "startPosIsLineStart" as True to make the call more efficient
1395 ** by avoiding the additional step of scanning back to the last newline.
1396 **
1397 ** Note that the definition of the end of a line is less clear when continuous
1398 ** wrap is on. With continuous wrap off, it's just a pointer to the newline
1399 ** that ends the line. When it's on, it's the character beyond the last
1400 ** DISPLAYABLE character on the line, where a whitespace character which has
1401 ** been "converted" to a newline for wrapping is not considered displayable.
1402 ** Also note that, a line can be wrapped at a non-whitespace character if the
1403 ** line had no whitespace. In this case, this routine returns a pointer to
1404 ** the start of the next line. This is also consistent with the model used by
1405 ** visLineLength.
1406 */
1408 {
1411 /* If we're not wrapping use more efficien BufEndOfLine */
1421 }
1423 /*
1424 ** Same as BufStartOfLine, but returns the character after last wrap point
1425 ** rather than the last newline.
1426 */
1428 {
1431 /* If we're not wrapping, use the more efficient BufStartOfLine */
1439 }
1441 /*
1442 ** Same as BufCountBackwardNLines, but takes in to account line breaks when
1443 ** wrapping is turned on.
1444 */
1446 {
1450 /* If we're not wrapping, use the more efficient BufCountBackwardNLines */
1461 True);
1467 }
1468 }
1470 /*
1471 ** Callback attached to the text buffer to receive delete information before
1472 ** the modifications are actually made.
1473 */
1475 {
1479 /* Note: we must perform this measurement, even if there is not a
1480 single character deleted; the number of "deleted" lines is the
1481 number of visual lines spanned by the real line in which the
1482 modification takes place.
1483 Also, a modification of the tab distance requires the same
1484 kind of calculations in advance, even if the font width is "fixed",
1485 because when the width of the tab characters changes, the layout
1486 of the text may be completely different. */
1488 else
1490 }
1492 /*
1493 ** Callback attached to the text buffer to receive modification information
1494 */
1497 {
1505 /* buffer modification cancels vertical cursor motion column */
1509 /* Count the number of lines inserted and deleted, and in the case
1510 of continuous wrap mode, how much has changed */
1518 }
1520 /* Update the line starts and topLineNum */
1529 }
1533 /* If we're counting non-wrapped lines as well, maintain the absolute
1534 (non-wrapped) line number of the text displayed */
1541 }
1543 /* Update the line count for the whole buffer */
1546 /* Update the scroll bar ranges (and value if the value changed). Note
1547 that updating the horizontal scroll bar range requires scanning the
1548 entire displayed text, however, it doesn't seem to hurt performance
1549 much. Note also, that the horizontal scroll bar update routine is
1550 allowed to re-adjust horizOffset if there is blank space to the right
1551 of all lines of text. */
1555 /* Update the cursor position */
1562 else
1564 }
1566 /* If the changes caused scrolling, re-paint everything and we're done. */
1574 }
1576 }
1578 /* If the changes didn't cause scrolling, decide the range of characters
1579 that need to be re-painted. Also if the cursor position moved, be
1580 sure that the redisplay range covers the old cursor position so the
1581 old cursor gets erased, and erase the bits of the cursor which extend
1582 beyond the left and right edges of the text. */
1595 }
1596 /* If more than one line is inserted/deleted, a line break may have
1597 been inserted or removed in between, and the line numbers may
1598 have changed. If only one line is altered, line numbers cannot
1599 be affected (the insertion or removal of a line break always
1600 results in at least two lines being redrawn). */
1607 }
1609 /* If there is a style buffer, check if the modification caused additional
1610 changes that need to be redisplayed. (Redisplaying separately would
1611 cause double-redraw on almost every modification involving styled
1612 text). Extend the redraw range to incorporate style changes */
1616 /* Redisplay computed range */
1618 }
1620 /*
1621 ** In continuous wrap mode, internal line numbers are calculated after
1622 ** wrapping. A separate non-wrapped line count is maintained when line
1623 ** numbering is turned on. There is some performance cost to maintaining this
1624 ** line count, so normally absolute line numbers are not tracked if line
1625 ** numbering is off. This routine allows callers to specify that they still
1626 ** want this line count maintained (for use via TextDPosToLineAndCol).
1627 ** More specifically, this allows the line number reported in the statistics
1628 ** line to be calibrated in absolute lines, rather than post-wrapped lines.
1629 */
1631 {
1634 }
1636 /*
1637 ** Returns the absolute (non-wrapped) line number of the first line displayed.
1638 ** Returns 0 if the absolute top line number is not being maintained.
1639 */
1641 {
1647 }
1649 /*
1650 ** Re-calculate absolute top line number for a change in scroll position.
1651 */
1653 {
1658 else
1661 }
1662 }
1664 /*
1665 ** Return true if a separate absolute top line number is being maintained
1666 ** (for displaying line numbers or showing in the statistics line).
1667 */
1669 {
1672 }
1674 /*
1675 ** Count lines from the beginning of the buffer to reestablish the
1676 ** absolute (non-wrapped) top line number. If mode is not continuous wrap,
1677 ** or the number is not being maintained, does nothing.
1678 */
1680 {
1683 }
1685 /*
1686 ** Find the line number of position "pos" relative to the first line of
1687 ** displayed text. Returns False if the line is not displayed.
1688 */
1690 {
1701 }
1706 }
1707 }
1709 }
1715 }
1716 }
1718 }
1720 /*
1721 ** Redisplay the text on a single line represented by "visLineNum" (the
1722 ** number of lines down from the top of the display), limited by
1723 ** "leftClip" and "rightClip" window coordinates and "leftCharIndex" and
1724 ** "rightCharIndex" character positions (not including the character at
1725 ** position "rightCharIndex").
1726 **
1727 ** The cursor is also drawn if it appears on the line.
1728 */
1731 {
1741 /* If line is not displayed, skip it */
1745 /* Shrink the clipping range to the active display area */
1751 }
1753 /* Calculate y coordinate of the string to draw */
1757 /* Get the text, length, and buffer position of the line to display */
1765 }
1767 /* Space beyond the end of the line is still counted in units of characters
1768 of a standardized character width (this is done mostly because style
1769 changes based on character position can still occur in this region due
1770 to rectangular selections). stdCharWidth must be non-zero to prevent a
1771 potential infinite loop if x does not advance */
1777 }
1779 /* Rectangular selections are based on "real" line starts (after a newline
1780 or start of buffer). Calculate the difference between the last newline
1781 position and the line start we're using. Since scanning back to find a
1782 newline is expensive, only do so if there's actually a rectangular
1783 selection which needs it */
1794 /* Step through character positions from the beginning of the line (even if
1795 that's off the left edge of the displayed area) to find the first
1796 character position that's not clipped, and the x coordinate for drawing
1797 that character */
1814 }
1817 }
1819 /* Scan character positions from the beginning of the clipping range, and
1820 draw parts whenever the style changes (also note if the cursor is on
1821 this line, and where it should be drawn to take advantage of the x
1822 position which we've gone to so much trouble to calculate) */
1836 }
1837 }
1838 }
1854 }
1860 outPtr++;
1862 outIndex++;
1863 }
1866 }
1868 /* Draw the remaining style segment */
1871 /* Draw the cursor if part of it appeared on the redisplayed part of
1872 this line. Also check for the cases which are not caught as the
1873 line is scanned above: when the cursor appears at the very end
1874 of the redisplayed section. */
1886 }
1887 }
1888 }
1890 /* If the y position of the cursor has changed, redraw the calltip */
1896 }
1898 /*
1899 ** Draw a string or blank area according to parameter "style", using the
1900 ** appropriate colors and drawing method for that style, with top left
1901 ** corner at x, y. If style says to draw text, use "string" as source of
1902 ** characters, and draw "nChars", if style is FILL, erase
1903 ** rectangle where text would have drawn from x to toX and from y to
1904 ** the maximum y extent of the current font(s).
1905 */
1908 {
1910 XGCValues gcValues;
1916 /* Don't draw if widget isn't realized */
1920 /* select a GC */
1923 }
1927 }
1931 }
1934 }
1937 /* we have work to do */
1939 /* Set font, color, and gc depending on style. For normal text, GCs
1940 for normal drawing, or drawing within a selection or highlight are
1941 pre-allocated and pre-configured. For syntax highlighting, GCs are
1942 configured here, on the fly. */
1949 /* here you could pick up specific select and highlight fground */
1950 }
1955 }
1956 /* Background color priority order is:
1957 1 Primary(Selection), 2 Highlight(Parens),
1958 3 Rangeset, 4 SyntaxHighlightStyle,
1959 5 Backlight (if NOT fill), 6 DefaultBackground */
1960 bground =
1966 bground) :
1973 /* set up gc for clearing using the foreground color entry */
1977 }
1979 /* Draw blank area rather than text, if that was the request */
1981 /* wipes out to right hand edge of widget */
1986 }
1988 /* If any space around the character remains unfilled (due to use of
1989 different sized fonts for highlighting), fill in above or below
1990 to erase previously drawn characters */
1997 /* set up gc for writing text (set foreground properly) */
2001 }
2003 /* Draw the string using gc and font set above */
2007 /* Underline if style is secondary selection */
2009 {
2010 /* restore foreground in GC (was set to background by clearRect()) */
2014 /* draw underline */
2017 }
2018 }
2020 /*
2021 ** Clear a rectangle with the appropriate background color for "style"
2022 */
2025 {
2026 /* A width of zero means "clear to end of window" to XClearArea */
2033 }
2037 }
2038 }
2040 /*
2041 ** Draw a cursor with top center at x, y.
2042 */
2044 {
2055 /* For cursors other than the block, make them around 2/3 of a character
2056 width, rounded to an even number of pixels so that X will draw an
2057 odd number centered on the stem at x. */
2062 /* Create segments and draw cursor */
2095 }
2099 /* Save the last position drawn */
2102 }
2104 /*
2105 ** Determine the drawing method to use to draw a specific character from "buf".
2106 ** "lineStartPos" gives the character index where the line begins, "lineIndex",
2107 ** the number of characters past the beginning of the line, and "dispIndex",
2108 ** the number of displayed characters past the beginning of the line. Passing
2109 ** lineStartPos of -1 returns the drawing style for "no text".
2110 **
2111 ** Why not just: styleOfPos(textD, pos)? Because style applies to blank areas
2112 ** of the window beyond the text boundaries, and because this routine must also
2113 ** decide whether a position is inside of a rectangular selection, and do so
2114 ** efficiently, without re-counting character positions from the start of the
2115 ** line.
2116 **
2117 ** Note that style is a somewhat incorrect name, drawing method would
2118 ** be more appropriate.
2119 */
2122 {
2137 /* encountered "unfinished" style, trigger parsing */
2140 }
2141 }
2148 /* store in the RANGESET_MASK portion of style the rangeset index for pos */
2152 }
2153 /* store in the BACKLIGHT_MASK portion of style the background color class
2154 of the character thisChar */
2156 {
2158 }
2160 }
2162 /*
2163 ** Find the width of a string in the font of a particular style
2164 */
2166 {
2171 else
2174 }
2176 /*
2177 ** Return true if position "pos" with indentation "dispIndex" is in
2178 ** selection "sel"
2179 */
2181 {
2188 }
2190 /*
2191 ** Translate window coordinates to the nearest (insert cursor or character
2192 ** cell) text position. The parameter posType specifies how to interpret the
2193 ** position: CURSOR_POS means translate the coordinates to the nearest cursor
2194 ** position, and CHARACTER_POS means return the position of the character
2195 ** closest to (x, y).
2196 */
2198 {
2203 /* Find the visible line number corresponding to the y coordinate */
2211 /* Find the position at the start of the line */
2214 /* If the line start was empty, return the last position in the buffer */
2218 /* Get the line text and its length */
2222 /* Step through character positions from the beginning of the line
2223 to find the character position corresponding to the x coordinate */
2235 }
2238 }
2240 /* If the x position was beyond the end of the line, return the position
2241 of the newline at the end of the line */
2244 }
2246 /*
2247 ** Translate window coordinates to the nearest row and column number for
2248 ** positioning the cursor. This, of course, makes no sense when the font is
2249 ** proportional, since there are no absolute columns. The parameter posType
2250 ** specifies how to interpret the position: CURSOR_POS means translate the
2251 ** coordinates to the nearest position between characters, and CHARACTER_POS
2252 ** means translate the position to the nearest character cell.
2253 */
2256 {
2260 /* Find the visible line number corresponding to the y coordinate */
2267 }
2269 /*
2270 ** Offset the line starts array, topLineNum, firstChar and lastChar, for a new
2271 ** vertical scroll position given by newTopLineNum. If any currently displayed
2272 ** lines will still be visible, salvage the line starts values, otherwise,
2273 ** count lines from the nearest known line start (start or end of buffer, or
2274 ** the closest value in the lineStarts array)
2275 */
2277 {
2286 /* If there was no offset, nothing needs to be changed */
2290 /* { int i;
2291 printf("Scroll, lineDelta %d\n", lineDelta);
2292 printf("lineStarts Before: ");
2293 for(i=0; i<nVisLines; i++) printf("%d ", lineStarts[i]);
2294 printf("\n");
2295 } */
2297 /* Find the new value for firstChar by counting lines from the nearest
2298 known line start (start or end of buffer, or the closest value in the
2299 lineStarts array) */
2303 True);
2304 /* printf("counting forward %d lines from start\n", newTopLineNum-1);*/
2308 /* printf("counting backward %d lines from firstChar\n", -lineDelta);*/
2311 /* printf("taking new start from lineStarts[%d]\n",
2312 newTopLineNum - oldTopLineNum); */
2316 /* printf("counting forward %d lines from start of last line\n",
2317 newTopLineNum - lastLineNum); */
2321 /* printf("counting backward %d lines from end\n",
2322 textD->nBufferLines - newTopLineNum + 1); */
2323 }
2325 /* Fill in the line starts array */
2337 /* Set lastChar and topLineNum */
2341 /* If we're numbering lines or being asked to maintain an absolute line
2342 number, re-calculate the absolute line number */
2345 /* { int i;
2346 printf("lineStarts After: ");
2347 for(i=0; i<nVisLines; i++) printf("%d ", lineStarts[i]);
2348 printf("\n");
2349 } */
2350 }
2352 /*
2353 ** Update the line starts array, topLineNum, firstChar and lastChar for text
2354 ** display "textD" after a modification to the text buffer, given by the
2355 ** position where the change began "pos", and the nmubers of characters
2356 ** and lines inserted and deleted.
2357 */
2360 {
2366 /* { int i;
2367 printf("linesDeleted %d, linesInserted %d, charsInserted %d, charsDeleted %d\n",
2368 linesDeleted, linesInserted, charsInserted, charsDeleted);
2369 printf("lineStarts Before: ");
2370 for(i=0; i<nVisLines; i++) printf("%d ", lineStarts[i]);
2371 printf("\n");
2372 } */
2373 /* If all of the changes were before the displayed text, the display
2374 doesn't change, just update the top line num and offset the line
2375 start entries and first and last characters */
2380 /* { int i;
2381 printf("lineStarts after delete doesn't touch: ");
2382 for(i=0; i<nVisLines; i++) printf("%d ", lineStarts[i]);
2383 printf("\n");
2384 } */
2389 }
2391 /* The change began before the beginning of the displayed text, but
2392 part or all of the displayed text was deleted */
2394 /* If some text remains in the window, anchor on that */
2400 /* Otherwise anchor on original line number and recount everything */
2408 }
2410 /* { int i;
2411 printf("lineStarts after delete encroaches: ");
2412 for(i=0; i<nVisLines; i++) printf("%d ", lineStarts[i]);
2413 printf("\n");
2414 } */
2415 /* calculate lastChar by finding the end of the last displayed line */
2419 }
2421 /* If the change was in the middle of the displayed text (it usually is),
2422 salvage as much of the line starts array as possible by moving and
2423 offsetting the entries after the changed area, and re-counting the
2424 added lines or the lines beyond the salvaged part of the line starts
2425 array */
2427 /* find line on which the change began */
2429 /* salvage line starts after the changed area */
2441 }
2442 /* { int i;
2443 printf("lineStarts after salvage: ");
2444 for(i=0; i<nVisLines; i++) printf("%d ", lineStarts[i]);
2445 printf("\n");
2446 } */
2447 /* fill in the missing line starts */
2452 /* { int i;
2453 printf("lineStarts after recalculation: ");
2454 for(i=0; i<nVisLines; i++) printf("%d ", lineStarts[i]);
2455 printf("\n");
2456 } */
2457 /* calculate lastChar by finding the end of the last displayed line */
2461 }
2463 /* Change was past the end of the displayed text, but displayable by virtue
2464 of being an insert at the end of the buffer into visible blank lines */
2469 /* { int i;
2470 printf("lineStarts after insert at end: ");
2471 for(i=0; i<nVisLines; i++) printf("%d ", lineStarts[i]);
2472 printf("\n");
2473 } */
2476 }
2478 /* Change was beyond the end of the buffer and not visible, do nothing */
2480 }
2482 /*
2483 ** Scan through the text in the "textD"'s buffer and recalculate the line
2484 ** starts array values beginning at index "startLine" and continuing through
2485 ** (including) "endLine". It assumes that the line starts entry preceding
2486 ** "startLine" (or textD->firstChar if startLine is 0) is good, and re-counts
2487 ** newlines to fill in the requested entries. Out of range values for
2488 ** "startLine" and "endLine" are acceptable.
2489 */
2491 {
2496 /* Clean up (possibly) messy input parameters */
2505 /* Find the last known good line number -> position mapping */
2509 }
2512 /* If the starting position is already past the end of the text,
2513 fill in -1's (means no text on line) and return */
2518 }
2520 /* Loop searching for ends of lines and storing the positions of the
2521 start of the next line in lineStarts */
2526 /* If the buffer ends with a newline or line break, put
2527 buf->length in the next line start position (instead of
2528 a -1 which is the normal marker for an empty line) to
2529 indicate that the cursor may safely be displayed there */
2533 line++;
2534 }
2536 }
2538 }
2540 /* Set any entries beyond the end of the text to -1 */
2543 }
2545 /*
2546 ** Given a textDisp with a complete, up-to-date lineStarts array, update
2547 ** the lastChar entry to point to the last buffer position displayed.
2548 */
2550 {
2556 }
2559 {
2565 }
2566 }
2567 }
2570 {
2576 }
2578 }
2580 void TextDTranlateGraphicExposeQueue(textDisp *textD, int xOffset, int yOffset, Boolean appendEntry)
2581 {
2584 newGEQEntry = (graphicExposeTranslationEntry *)XtMalloc(sizeof(graphicExposeTranslationEntry));
2588 }
2595 }
2598 }
2599 }
2603 }
2604 }
2605 }
2609 {
2617 /* Do nothing if scroll position hasn't actually changed or there's no
2618 window to draw in yet */
2623 /* If part of the cursor is protruding beyond the text clipping region,
2624 clear it off */
2627 /* If the vertical scroll position has changed, update the line
2628 starts array and related counters in the text display */
2631 /* Just setting textD->horizOffset is enough information for redisplay */
2634 /* Update the scroll bar positions if requested, note: updating the
2635 horizontal scroll bars can have the further side-effect of changing
2636 the horizontal scroll position, textD->horizOffset */
2639 }
2642 }
2644 /* Redisplay everything if the window is partially obscured (since
2645 it's too hard to tell what displayed areas are salvageable) or
2646 if there's nothing to recover because the scroll distance is large */
2655 /* If the window is not obscured, paint most of the window using XCopyArea
2656 from existing displayed text, and redraw only what's necessary */
2657 /* Recover the useable window areas by moving to the proper location */
2668 /* redraw the un-recoverable parts */
2672 }
2676 }
2680 }
2684 }
2685 /* Restore protruding parts of the cursor */
2687 }
2689 /* Refresh line number/calltip display if its up and we've scrolled
2690 vertically */
2694 }
2697 }
2699 /*
2700 ** Update the minimum, maximum, slider size, page increment, and value
2701 ** for vertical scroll bar.
2702 */
2704 {
2710 /* The Vert. scroll bar value and slider size directly represent the top
2711 line number, and the number of visible lines respectively. The scroll
2712 bar maximum value is chosen to generally represent the size of the whole
2713 buffer, with minor adjustments to keep the scroll bar widget happy */
2724 }
2726 /*
2727 ** Update the minimum, maximum, slider size, page increment, and value
2728 ** for the horizontal scroll bar. If scroll position is such that there
2729 ** is blank space to the right of all lines of text, scroll back (adjust
2730 ** horizOffset but don't redraw) to take up the slack and position the
2731 ** right edge of the text at the right edge of the display.
2732 **
2733 ** Note, there is some cost to this routine, since it scans the whole range
2734 ** of displayed text, particularly since it's usually called for each typed
2735 ** character!
2736 */
2738 {
2745 /* Scan all the displayed lines to find the width of the longest line */
2749 /* If the scroll position is beyond what's necessary to keep all lines
2750 in view, scroll to the left to bring the end of the longest line to
2751 the right margin */
2755 /* Readjust the scroll bar */
2764 /* Return True if scroll position was changed */
2766 }
2768 /*
2769 ** Define area for drawing line numbers. A width of 0 disables line
2770 ** number drawing.
2771 */
2774 {
2783 }
2785 /*
2786 ** Refresh the line number area. If clearAll is False, writes only over
2787 ** the character cell areas. Setting clearAll to True will clear out any
2788 ** stray marks outside of the character cell area, which might have been
2789 ** left from before a resize or font change.
2790 */
2792 {
2797 XRectangle clipRect;
2800 /* Don't draw if lineNumWidth == 0 (line numbers are hidden), or widget is
2801 not yet realized */
2805 /* Make sure we reset the clipping range for the line numbers GC, because
2806 the GC may be shared (eg, if the line numbers and text have the same
2807 color) and therefore the clipping ranges may be invalid. */
2815 /* Erase the previous contents of the line number area, if requested */
2820 /* Draw the line numbers, aligned to the text */
2832 line++;
2838 line++;
2839 }
2841 }
2842 }
2844 /*
2845 ** Callbacks for drag or valueChanged on scroll bars
2846 */
2848 {
2856 }
2858 {
2865 }
2869 {
2870 /* Record whether the window is fully visible or not. This information
2871 is used for choosing the scrolling methodology for optimal performance,
2872 if the window is partially obscured, XCopyArea may not work */
2874 }
2877 {
2879 }
2882 {
2884 }
2886 /*
2887 ** Count the number of newlines in a null-terminated text string;
2888 */
2890 {
2899 }
2901 /*
2902 ** Return the width in pixels of the displayed line pointed to by "visLineNum"
2903 */
2905 {
2916 }
2924 len);
2926 }
2927 }
2929 }
2931 /*
2932 ** Return true if there are lines visible with no corresponding buffer text
2933 */
2935 {
2938 }
2940 /*
2941 ** When the cursor is at the left or right edge of the text, part of it
2942 ** sticks off into the clipped region beyond the text. Normal redrawing
2943 ** can not overwrite this protruding part of the cursor, so it must be
2944 ** erased independently by calling this routine.
2945 */
2947 {
2965 }
2967 /*
2968 ** Allocate shared graphics contexts used by the widget, which must be
2969 ** re-allocated on a font change.
2970 */
2974 {
2979 GCArcMode);
2984 GCArcMode);
2990 }
2992 /*
2993 ** X11R4 does not have the XtAllocateGC function for sharing graphics contexts
2994 ** with changeable fields. Unfortunately the R4 call for creating shared
2995 ** graphics contexts (XtGetGC) is rarely useful because most widgets need
2996 ** to be able to set and change clipping, and that makes the GC unshareable.
2997 **
2998 ** This function allocates and returns a gc, using XtAllocateGC if possible,
2999 ** or XCreateGC on X11R4 systems where XtAllocateGC is not available.
3000 */
3004 {
3005 XGCValues gcValues;
3010 #if defined(XlibSpecificationRelease) && XlibSpecificationRelease > 4
3012 dontCareMask);
3013 #else
3016 #endif
3017 }
3019 /*
3020 ** Release a gc allocated with allocateGC above
3021 */
3023 {
3024 #if defined(XlibSpecificationRelease) && XlibSpecificationRelease > 4
3026 #else
3028 #endif
3029 }
3031 /*
3032 ** resetClipRectangles sets the clipping rectangles for GCs which clip
3033 ** at the text boundary (as opposed to the window boundary). These GCs
3034 ** are shared such that the drawing styles are constant, but the clipping
3035 ** rectangles are allowed to change among different users of the GCs (the
3036 ** GCs were created with XtAllocGC). This routine resets them so the clipping
3037 ** rectangles are correct for this text display.
3038 */
3040 {
3041 XRectangle clipRect;
3062 }
3064 /*
3065 ** Return the length of a line (number of displayable characters) by examining
3066 ** entries in the line starts array rather than by scanning for newlines
3067 */
3069 {
3082 }
3084 /*
3085 ** When continuous wrap is on, and the user inserts or deletes characters,
3086 ** wrapping can happen before and beyond the changed position. This routine
3087 ** finds the extent of the changes, and counts the deleted and inserted lines
3088 ** over that range. It also attempts to minimize the size of the range to
3089 ** what has to be counted and re-displayed, so the results can be useful
3090 ** both for delimiting where the line starts need to be recalculated, and
3091 ** for deciding what part of the text to redisplay.
3092 */
3096 {
3104 /*
3105 ** Determine where to begin searching: either the previous newline, or
3106 ** if possible, limit to the start of the (original) previous displayed
3107 ** line, using information from the existing line starts array
3108 */
3122 /*
3123 ** Move forward through the (new) text one line at a time, counting
3124 ** displayed lines, and looking for either a real newline, or for the
3125 ** line starts to re-sync with the original line starts array
3126 */
3131 /* advance to the next line. If the line ended in a real newline
3132 or the end of the buffer, that's far enough */
3139 nLines++;
3143 nLines++;
3149 }
3151 /* Don't try to resync in continuous wrap mode with non-fixed font
3152 sizes; it would result in a chicken-and-egg dependency between
3153 the calculations for the inserted and the deleted lines.
3154 If we're in that mode, the number of deleted lines is calculated in
3155 advance, without resynchronization, so we shouldn't resynchronize
3156 for the inserted lines either. */
3160 /* check for synchronization with the original line starts array
3161 before pos, if so, the modified range can begin later */
3164 visLineNum++;
3170 else
3174 }
3176 /* check for synchronization with the original line starts array
3177 after pos, if so, the modified range can end early */
3181 visLineNum++;
3187 }
3188 }
3189 }
3193 /* Count deleted lines between countFrom and countTo as the text existed
3194 before the modification (that is, as if the text between pos and
3195 pos+nInserted were replaced by "deletedText"). This extra context is
3196 necessary because wrapping can occur outside of the modified region
3197 as a result of adding or deleting text in the region. This is done by
3198 creating a textBuffer containing the deleted text and the necessary
3199 additional context, and calling the wrappedLineCounter on it.
3201 NOTE: This must not be done in continuous wrap mode when the font
3202 width is not fixed. In that case, the calculation would try
3203 to access style information that is no longer available (deleted
3204 text), or out of date (updated highlighting), possibly leading
3205 to completely wrong calculations and/or even crashes eventually.
3206 (This is not theoretical; it really happened.)
3208 In that case, the calculation of the number of deleted lines
3209 has happened before the buffer was modified (only in that case,
3210 because resynchronization of the line starts is impossible
3211 in that case, which makes the whole calculation less efficient).
3212 */
3217 }
3228 /* Note that we need to take into account an offset for the style buffer:
3229 the deletedTextBuf can be out of sync with the style buffer. */
3235 }
3237 /*
3238 ** This is a stripped-down version of the findWrapRange() function above,
3239 ** intended to be used to calculate the number of "deleted" lines during
3240 ** a buffer modification. It is called _before_ the modification takes place.
3241 **
3242 ** This function should only be called in continuous wrap mode with a
3243 ** non-fixed font width. In that case, it is impossible to calculate
3244 ** the number of deleted lines, because the necessary style information
3245 ** is no longer available _after_ the modification. In other cases, we
3246 ** can still perform the calculation afterwards (possibly even more
3247 ** efficiently).
3248 */
3250 {
3257 /*
3258 ** Determine where to begin searching: either the previous newline, or
3259 ** if possible, limit to the start of the (original) previous displayed
3260 ** line, using information from the existing line starts array
3261 */
3273 /*
3274 ** Move forward through the (new) text one line at a time, counting
3275 ** displayed lines, and looking for either a real newline, or for the
3276 ** line starts to re-sync with the original line starts array
3277 */
3280 /* advance to the next line. If the line ended in a real newline
3281 or the end of the buffer, that's far enough */
3286 nLines++;
3290 nLines++;
3294 }
3296 /* Unlike in the findWrapRange() function above, we don't try to
3297 resync with the line starts, because we don't know the length
3298 of the inserted text yet, nor the updated style information.
3300 Because of that, we also shouldn't resync with the line starts
3301 after the modification either, because we must perform the
3302 calculations for the deleted and inserted lines in the same way.
3304 This can result in some unnecessary recalculation and redrawing
3305 overhead, and therefore we should only use this two-phase mode
3306 of calculation when it's really needed (continuous wrap + variable
3307 font width). */
3308 }
3311 }
3313 /*
3314 ** Count forward from startPos to either maxPos or maxLines (whichever is
3315 ** reached first), and return all relevant positions and line count.
3316 ** The provided textBuffer may differ from the actual text buffer of the
3317 ** widget. In that case it must be a (partial) copy of the actual text buffer
3318 ** and the styleBufOffset argument must indicate the starting position of the
3319 ** copy, to take into account the correct style information.
3320 **
3321 ** Returned values:
3322 **
3323 ** retPos: Position where counting ended. When counting lines, the
3324 ** position returned is the start of the line "maxLines"
3325 ** lines beyond "startPos".
3326 ** retLines: Number of line breaks counted
3327 ** retLineStart: Start of the line where counting ended
3328 ** retLineEnd: End position of the last line traversed
3329 */
3333 {
3340 /* If the font is fixed, or there's a wrap margin set, it's more efficient
3341 to measure in columns, than to count pixels. Determine if we can count
3342 in columns (countPixels == False) or must count pixels (countPixels ==
3343 True), and set the wrap target for either pixels or columns */
3353 }
3355 /* Find the start of the line if the start pos is not marked as a
3356 line start. */
3359 else
3362 /*
3363 ** Loop until position exceeds maxPos or line count exceeds maxLines.
3364 ** (actually, contines beyond maxPos to end of line containing maxPos,
3365 ** in case later characters cause a word wrap back before maxPos)
3366 */
3372 /* If the character was a newline, count the line and start over,
3373 otherwise, add it to the width and column counts */
3381 }
3382 nLines++;
3389 }
3397 }
3399 /* If character exceeded wrap margin, find the break point
3400 and wrap there */
3414 colNum++;
3415 }
3420 }
3421 }
3427 }
3432 newLineStart;
3435 }
3436 nLines++;
3443 }
3445 }
3446 }
3448 /* reached end of buffer before reaching pos or line target */
3453 }
3455 /*
3456 ** Measure the width in pixels of a character "c" at a particular column
3457 ** "colNum" and buffer position "pos". This is for measuring characters in
3458 ** proportional or mixed-width highlighting fonts.
3459 **
3460 ** A note about proportional and mixed-width fonts: the mixed width and
3461 ** proportional font code in nedit does not get much use in general editing,
3462 ** because nedit doesn't allow per-language-mode fonts, and editing programs
3463 ** in a proportional font is usually a bad idea, so very few users would
3464 ** choose a proportional font as a default. There are still probably mixed-
3465 ** width syntax highlighting cases where things don't redraw properly for
3466 ** insertion/deletion, though static display and wrapping and resizing
3467 ** should now be solid because they are now used for online help display.
3468 */
3470 {
3482 /* encountered "unfinished" style, trigger parsing */
3485 }
3486 }
3488 }
3490 /*
3491 ** Finds both the end of the current line and the start of the next line. Why?
3492 ** In continuous wrap mode, if you need to know both, figuring out one from the
3493 ** other can be expensive or error prone. The problem comes when there's a
3494 ** trailing space or tab just before the end of the buffer. To translate an
3495 ** end of line value to or from the next lines start value, you need to know
3496 ** whether the trailing space or tab is being used as a line break or just a
3497 ** normal character, and to find that out would otherwise require counting all
3498 ** the way back to the beginning of the line.
3499 */
3502 {
3505 /* if we're not wrapping use more efficient BufEndOfLine */
3510 }
3512 /* use the wrapped line counter routine to count forward one line */
3517 }
3519 /*
3520 ** Line breaks in continuous wrap mode usually happen at newlines or
3521 ** whitespace. This line-terminating character is not included in line
3522 ** width measurements and has a special status as a non-visible character.
3523 ** However, lines with no whitespace are wrapped without the benefit of a
3524 ** line terminating character, and this distinction causes endless trouble
3525 ** with all of the text display code which was originally written without
3526 ** continuous wrap mode and always expects to wrap at a newline character.
3527 **
3528 ** Given the position of the end of the line, as returned by TextDEndOfLine
3529 ** or BufEndOfLine, this returns true if there is a line terminating
3530 ** character, and false if there's not. On the last character in the
3531 ** buffer, this function can't tell for certain whether a trailing space was
3532 ** used as a wrap point, and just guesses that it wasn't. So if an exact
3533 ** accounting is necessary, don't use this function.
3534 */
3536 {
3545 }
3547 /*
3548 ** Decide whether the user needs (or may need) a horizontal scroll bar,
3549 ** and manage or unmanage the scroll bar widget accordingly. The H.
3550 ** scroll bar is only hidden in continuous wrap mode when it's absolutely
3551 ** certain that the user will not need it: when wrapping is set
3552 ** to the window edge, or when the wrap margin is strictly less than
3553 ** the longest possible line.
3554 */
3556 {
3560 else
3562 }
3564 /*
3565 ** Return true if the selection "sel" is rectangular, and touches a
3566 ** buffer position withing "rangeStart" to "rangeEnd"
3567 */
3569 {
3572 }
3574 /*
3575 ** Extend the range of a redraw request (from *start to *end) with additional
3576 ** redraw requests resulting from changes to the attached style buffer (which
3577 ** contains auxiliary information for coloring or styling text).
3578 */
3580 {
3584 /* The peculiar protocol used here is that modifications to the style
3585 buffer are marked by selecting them with the buffer's primary selection.
3586 The style buffer is usually modified in response to a modify callback on
3587 the text buffer BEFORE textDisp.c's modify callback, so that it can keep
3588 the style buffer in step with the text buffer. The style-update
3589 callback can't just call for a redraw, because textDisp hasn't processed
3590 the original text changes yet. Anyhow, to minimize redrawing and to
3591 avoid the complexity of scheduling redraws later, this simple protocol
3592 tells the text display's buffer modify callback to extend it's redraw
3593 range to show the text color/and font changes as well. */
3598 }
3602 }
3603 }
3605 /* If the selection was extended due to a style change, and some of the
3606 fonts don't match in spacing, extend redraw area to end of line to
3607 redraw characters exposed by possible font size changes */
3610 }
3612 /********************** Backlight Functions ******************************/
3613 /*
3614 ** Allocate a read-only (shareable) colormap cell for a named color, from the
3615 ** the default colormap of the screen on which the widget (w) is displayed. If
3616 ** the colormap is full and there's no suitable substitute, print an error on
3617 ** stderr, and return the widget's background color as a backup.
3618 */
3620 {
3624 }
3627 {
3630 Pixel color;
3635 ind--;
3645 }
3648 }
3649 }
3651 }
3653 /*
3654 ** Read the background color class specification string in str, allocating the
3655 ** necessary colors, and allocating and setting up the character->class_no and
3656 ** class_no->pixel map arrays, returned via *pp_bgClass and *pp_bgClassPixel
3657 ** respectively.
3658 ** Note: the allocation of class numbers could be more intelligent: there can
3659 ** never be more than 256 of these (one per character); but I don't think
3660 ** there'll be a pressing need. I suppose the scanning of the specification
3661 ** could be better too, but then, who cares!
3662 */
3665 {
3685 /* default for all chars is class number zero, for standard background */
3689 /* since class no == 0 in a "style" has no set bits in BACKLIGHT_MASK
3690 (see styleOfPos()), when drawString() is called for text with a
3691 backlight class no of zero, bgClassPixel[0] is never consulted, and
3692 the default background color is chosen. */
3694 /* The format of the class string s is:
3695 low[-high]{,low[-high]}:color{;low-high{,low[-high]}:color}
3696 eg
3697 32-255:#f0f0f0;1-31,127:red;128-159:orange;9-13:#e5e5e5
3698 where low and high represent a character range between ordinal
3699 ASCII values. Using strtol() allows automatic octal, dec and hex
3700 reading of low and high. The example format sets backgrounds as follows:
3701 char 1 - 8 colored red (control characters)
3702 char 9 - 13 colored #e5e5e5 (isspace() control characters)
3703 char 14 - 31 colored red (control characters)
3704 char 32 - 126 colored #f0f0f0
3705 char 127 colored red (delete character)
3706 char 128 - 159 colored orange ("shifted" control characters)
3707 char 160 - 255 colored #f0f0f0
3708 Notice that some of the later ranges overwrite the class values defined
3709 for earlier ones (eg the first clause, 32-255:#f0f0f0 sets the DEL
3710 character background color to #f0f0f0; it is then set to red by the
3711 clause 1-31,127:red). */
3720 }
3722 /* loop over ranges before the color spec, assigning the characters
3723 in the ranges to the current class number */
3725 is_good;
3735 }
3739 }
3741 /* complain? this class spec clause (in string s) was faulty */
3742 }
3744 /* end of loop iterator clauses */
3748 }
3749 /* when we get here, we've set up our class table and class-to-pixel table
3750 in local variables: now put them into the "real thing" */
3759 }
3762 }
3763 }