tk.git - Tk is a free and open-source, cross-platform widget toolkit that provides a library of basic elements of GUI widgets for building a graphical user interface (GUI) in many programming languages.

diff options

author	jenglish <jenglish@flightlab.com>	2007-01-11 14:49:45 (GMT)
committer	jenglish <jenglish@flightlab.com>	2007-01-11 14:49:45 (GMT)
commit	a46a8df372318c40d2d0c346578eef7412a7b257 (patch)
tree	fe033de3dd789135611ff553cdad27ead5f00297 /generic/tkImgUtil.c
parent	67771314a2fb4326cc411f74011c1d47edd3bfa5 (diff)
download	tk-a46a8df372318c40d2d0c346578eef7412a7b257.zip tk-a46a8df372318c40d2d0c346578eef7412a7b257.tar.gz tk-a46a8df372318c40d2d0c346578eef7412a7b257.tar.bz2

Revert addition of contravariant 'const' qualifiers,

to keep in sync with Tile codebase (which must remain compatible with Tk 8.4).

Diffstat (limited to 'generic/tkImgUtil.c')

0 files changed, 0 insertions, 0 deletions

/* * tkTextMark.c -- * * This file contains the functions that implement marks for text * widgets. * * Copyright (c) 1994 The Regents of the University of California. * Copyright (c) 1994-1997 Sun Microsystems, Inc. * * See the file "license.terms" for information on usage and redistribution of * this file, and for a DISCLAIMER OF ALL WARRANTIES. */ #include "tkInt.h" #include "tkText.h" /* * Macro that determines the size of a mark segment: */ #define MSEG_SIZE ((unsigned) (Tk_Offset(TkTextSegment, body) \ + sizeof(TkTextMark))) /* * Forward references for functions defined in this file: */ static void InsertUndisplayProc(TkText *textPtr, TkTextDispChunk *chunkPtr); static int MarkDeleteProc(TkTextSegment *segPtr, TkTextLine *linePtr, int treeGone); static TkTextSegment * MarkCleanupProc(TkTextSegment *segPtr, TkTextLine *linePtr); static void MarkCheckProc(TkTextSegment *segPtr, TkTextLine *linePtr); static int MarkLayoutProc(TkText *textPtr, TkTextIndex *indexPtr, TkTextSegment *segPtr, int offset, int maxX, int maxChars, int noCharsYet, TkWrapMode wrapMode, TkTextDispChunk *chunkPtr); static int MarkFindNext(Tcl_Interp *interp, TkText *textPtr, const char *markName); static int MarkFindPrev(Tcl_Interp *interp, TkText *textPtr, const char *markName); /* * The following structures declare the "mark" segment types. There are * actually two types for marks, one with left gravity and one with right * gravity. They are identical except for their gravity property. */ const Tk_SegType tkTextRightMarkType = { "mark", /* name */ 0, /* leftGravity */ NULL, /* splitProc */ MarkDeleteProc, /* deleteProc */ MarkCleanupProc, /* cleanupProc */ NULL, /* lineChangeProc */ MarkLayoutProc, /* layoutProc */ MarkCheckProc /* checkProc */ }; const Tk_SegType tkTextLeftMarkType = { "mark", /* name */ 1, /* leftGravity */ NULL, /* splitProc */ MarkDeleteProc, /* deleteProc */ MarkCleanupProc, /* cleanupProc */ NULL, /* lineChangeProc */ MarkLayoutProc, /* layoutProc */ MarkCheckProc /* checkProc */ }; /* *-------------------------------------------------------------- * * TkTextMarkCmd -- * * This function is invoked to process the "mark" options of the widget * command for text widgets. See the user documentation for details on * what it does. * * Results: * A standard Tcl result. * * Side effects: * See the user documentation. * *-------------------------------------------------------------- */ int TkTextMarkCmd( register TkText *textPtr, /* Information about text widget. */ Tcl_Interp *interp, /* Current interpreter. */ int objc, /* Number of arguments. */ Tcl_Obj *const objv[]) /* Argument objects. Someone else has already * parsed this command enough to know that * objv[1] is "mark". */ { Tcl_HashEntry *hPtr; TkTextSegment *markPtr; Tcl_HashSearch search; TkTextIndex index; const Tk_SegType *newTypePtr; int optionIndex; static const char *markOptionStrings[] = { "gravity", "names", "next", "previous", "set", "unset", NULL }; enum markOptions { MARK_GRAVITY, MARK_NAMES, MARK_NEXT, MARK_PREVIOUS, MARK_SET, MARK_UNSET }; if (objc < 3) { Tcl_WrongNumArgs(interp, 2, objv, "option ?arg arg ...?"); return TCL_ERROR; } if (Tcl_GetIndexFromObj(interp, objv[2], markOptionStrings, "mark option", 0, &optionIndex) != TCL_OK) { return TCL_ERROR; } switch ((enum markOptions) optionIndex) { case MARK_GRAVITY: { char c; int length; char *str; if (objc < 4 || objc > 5) { Tcl_WrongNumArgs(interp, 3, objv, "markName ?gravity?"); return TCL_ERROR; } str = Tcl_GetStringFromObj(objv[3],&length); if (length == 6 && !strcmp(str, "insert")) { markPtr = textPtr->insertMarkPtr; } else if (length == 7 && !strcmp(str, "current")) { markPtr = textPtr->currentMarkPtr; } else { hPtr = Tcl_FindHashEntry(&textPtr->sharedTextPtr->markTable, str); if (hPtr == NULL) { Tcl_AppendResult(interp, "there is no mark named \"", Tcl_GetString(objv[3]), "\"", NULL); return TCL_ERROR; } markPtr = (TkTextSegment *) Tcl_GetHashValue(hPtr); } if (objc == 4) { if (markPtr->typePtr == &tkTextRightMarkType) { Tcl_SetResult(interp, "right", TCL_STATIC); } else { Tcl_SetResult(interp, "left", TCL_STATIC); } return TCL_OK; } str = Tcl_GetStringFromObj(objv[4],&length); c = str[0]; if ((c == 'l') && (strncmp(str, "left", (unsigned)length) == 0)) { newTypePtr = &tkTextLeftMarkType; } else if ((c == 'r') && (strncmp(str, "right", (unsigned)length) == 0)) { newTypePtr = &tkTextRightMarkType; } else { Tcl_AppendResult(interp, "bad mark gravity \"", str, "\": must be left or right", NULL); return TCL_ERROR; } TkTextMarkSegToIndex(textPtr, markPtr, &index); TkBTreeUnlinkSegment(markPtr, markPtr->body.mark.linePtr); markPtr->typePtr = newTypePtr; TkBTreeLinkSegment(markPtr, &index); break; } case MARK_NAMES: if (objc != 3) { Tcl_WrongNumArgs(interp, 3, objv, NULL); return TCL_ERROR; } Tcl_AppendElement(interp, "insert"); Tcl_AppendElement(interp, "current"); for (hPtr = Tcl_FirstHashEntry(&textPtr->sharedTextPtr->markTable, &search); hPtr != NULL; hPtr = Tcl_NextHashEntry(&search)) { Tcl_AppendElement(interp, Tcl_GetHashKey(&textPtr->sharedTextPtr->markTable, hPtr)); } break; case MARK_NEXT: if (objc != 4) { Tcl_WrongNumArgs(interp, 3, objv, "index"); return TCL_ERROR; } return MarkFindNext(interp, textPtr, Tcl_GetString(objv[3])); case MARK_PREVIOUS: if (objc != 4) { Tcl_WrongNumArgs(interp, 3, objv, "index"); return TCL_ERROR; } return MarkFindPrev(interp, textPtr, Tcl_GetString(objv[3])); case MARK_SET: if (objc != 5) { Tcl_WrongNumArgs(interp, 3, objv, "markName index"); return TCL_ERROR; } if (TkTextGetObjIndex(interp, textPtr, objv[4], &index) != TCL_OK) { return TCL_ERROR; } TkTextSetMark(textPtr, Tcl_GetString(objv[3]), &index); return TCL_OK; case MARK_UNSET: { int i; for (i = 3; i < objc; i++) { hPtr = Tcl_FindHashEntry(&textPtr->sharedTextPtr->markTable, Tcl_GetString(objv[i])); if (hPtr != NULL) { markPtr = (TkTextSegment *) Tcl_GetHashValue(hPtr); /* * Special case not needed with peer widgets. */ if ((markPtr == textPtr->insertMarkPtr) || (markPtr == textPtr->currentMarkPtr)) { continue; } TkBTreeUnlinkSegment(markPtr, markPtr->body.mark.linePtr); Tcl_DeleteHashEntry(hPtr); ckfree((char *) markPtr); } } break; } } return TCL_OK; } /* *---------------------------------------------------------------------- * * TkTextSetMark -- * * Set a mark to a particular position, creating a new mark if one * doesn't already exist. * * Results: * The return value is a pointer to the mark that was just set. * * Side effects: * A new mark is created, or an existing mark is moved. * *---------------------------------------------------------------------- */ TkTextSegment * TkTextSetMark( TkText *textPtr, /* Text widget in which to create mark. */ const char *name, /* Name of mark to set. */ TkTextIndex *indexPtr) /* Where to set mark. */ { Tcl_HashEntry *hPtr = NULL; TkTextSegment *markPtr; TkTextIndex insertIndex; int isNew, widgetSpecific; if (!strcmp(name, "insert")) { widgetSpecific = 1; markPtr = textPtr->insertMarkPtr; isNew = (markPtr == NULL ? 1 : 0); } else if (!strcmp(name, "current")) { widgetSpecific = 2; markPtr = textPtr->currentMarkPtr; isNew = (markPtr == NULL ? 1 : 0); } else { widgetSpecific = 0; hPtr = Tcl_CreateHashEntry(&textPtr->sharedTextPtr->markTable, name, &isNew); markPtr = (TkTextSegment *) Tcl_GetHashValue(hPtr); } if (!isNew) { /* * If this is the insertion point that's being moved, be sure to force * a display update at the old position. Also, don't let the insertion * cursor be after the final newline of the file. */ if (markPtr == textPtr->insertMarkPtr) { TkTextIndex index, index2; int nblines; TkTextMarkSegToIndex(textPtr, textPtr->insertMarkPtr, &index); TkTextIndexForwChars(NULL,&index, 1, &index2, COUNT_INDICES); /* * While we wish to redisplay, no heights have changed, so no need * to call TkTextInvalidateLineMetrics. */ TkTextChanged(NULL, textPtr, &index, &index2); /* * The number of lines in the widget is zero if and only if it is * a partial peer with -startline == -endline, i.e. an empty * peer. In this case the mark shall be set exactly at the given * index, and not one character backwards (bug 3487407). */ nblines = TkBTreeNumLines(textPtr->sharedTextPtr->tree, textPtr); if ((TkBTreeLinesTo(textPtr, indexPtr->linePtr) == nblines) && (nblines > 0)) { TkTextIndexBackChars(NULL,indexPtr, 1, &insertIndex, COUNT_INDICES); indexPtr = &insertIndex; } } TkBTreeUnlinkSegment(markPtr, markPtr->body.mark.linePtr); } else { markPtr = (TkTextSegment *) ckalloc(MSEG_SIZE); markPtr->typePtr = &tkTextRightMarkType; markPtr->size = 0; markPtr->body.mark.textPtr = textPtr; markPtr->body.mark.linePtr = indexPtr->linePtr; markPtr->body.mark.hPtr = hPtr; if (widgetSpecific == 0) { Tcl_SetHashValue(hPtr, markPtr); } else if (widgetSpecific == 1) { textPtr->insertMarkPtr = markPtr; } else { textPtr->currentMarkPtr = markPtr; } } TkBTreeLinkSegment(markPtr, indexPtr); /* * If the mark is the insertion cursor, then update the screen at the * mark's new location. */ if (markPtr == textPtr->insertMarkPtr) { TkTextIndex index2; TkTextIndexForwChars(NULL,indexPtr, 1, &index2, COUNT_INDICES); /* * While we wish to redisplay, no heights have changed, so no need to * call TkTextInvalidateLineMetrics */ TkTextChanged(NULL, textPtr, indexPtr, &index2); } return markPtr; } /* *-------------------------------------------------------------- * * TkTextMarkSegToIndex -- * * Given a segment that is a mark, create an index that refers to the * next text character (or other text segment with non-zero size) after * the mark. * * Results: * *IndexPtr is filled in with index information. * * Side effects: * None. * *-------------------------------------------------------------- */ void TkTextMarkSegToIndex( TkText *textPtr, /* Text widget containing mark. */ TkTextSegment *markPtr, /* Mark segment. */ TkTextIndex *indexPtr) /* Index information gets stored here. */ { TkTextSegment *segPtr; indexPtr->tree = textPtr->sharedTextPtr->tree; indexPtr->linePtr = markPtr->body.mark.linePtr; indexPtr->byteIndex = 0; for (segPtr = indexPtr->linePtr->segPtr; segPtr != markPtr; segPtr = segPtr->nextPtr) { indexPtr->byteIndex += segPtr->size; } } /* *-------------------------------------------------------------- * * TkTextMarkNameToIndex -- * * Given the name of a mark, return an index corresponding to the mark * name. * * Results: * The return value is TCL_OK if "name" exists as a mark in the text * widget and is located within its -starline/-endline range. In this * case *indexPtr is filled in with the next segment who is after the * mark whose size is non-zero. TCL_ERROR is returned if the mark * doesn't exist in the text widget, or if it is out of its -starline/ * -endline range. In this latter case *indexPtr still contains valid * information, in particular TkTextMarkNameToIndex called with the * "insert" or "current" mark name may return TCL_ERROR, but *indexPtr * contains the correct index of this mark before -startline or after * -endline. * * Side effects: * None. * *-------------------------------------------------------------- */ int TkTextMarkNameToIndex( TkText *textPtr, /* Text widget containing mark. */ const char *name, /* Name of mark. */ TkTextIndex *indexPtr) /* Index information gets stored here. */ { TkTextSegment *segPtr; TkTextIndex index; int start, end; if (textPtr == NULL) { return TCL_ERROR; } if (!strcmp(name, "insert")) { segPtr = textPtr->insertMarkPtr; } else if (!strcmp(name, "current")) { segPtr = textPtr->currentMarkPtr; } else { Tcl_HashEntry *hPtr; hPtr = Tcl_FindHashEntry(&textPtr->sharedTextPtr->markTable, name); if (hPtr == NULL) { return TCL_ERROR; } segPtr = (TkTextSegment *) Tcl_GetHashValue(hPtr); } TkTextMarkSegToIndex(textPtr, segPtr, indexPtr); /* If indexPtr refers to somewhere outside the -startline/-endline * range limits of the widget, error out since the mark indeed is not * reachable from this text widget (it may be reachable from a peer) * (bug 1630271). */ if (textPtr->start != NULL) { start = TkBTreeLinesTo(NULL, textPtr->start); TkTextMakeByteIndex(textPtr->sharedTextPtr->tree, NULL, start, 0, &index); if (TkTextIndexCmp(indexPtr, &index) < 0) { return TCL_ERROR; } } if (textPtr->end != NULL) { end = TkBTreeLinesTo(NULL, textPtr->end); TkTextMakeByteIndex(textPtr->sharedTextPtr->tree, NULL, end, 0, &index); if (TkTextIndexCmp(indexPtr, &index) > 0) { return TCL_ERROR; } } return TCL_OK; } /* *-------------------------------------------------------------- * * MarkDeleteProc -- * * This function is invoked by the text B-tree code whenever a mark lies * in a range of characters being deleted. * * Results: * Returns 1 to indicate that deletion has been rejected. * * Side effects: * None (even if the whole tree is being deleted we don't free up the * mark; it will be done elsewhere). * *-------------------------------------------------------------- */ /* ARGSUSED */ static int MarkDeleteProc( TkTextSegment *segPtr, /* Segment being deleted. */ TkTextLine *linePtr, /* Line containing segment. */ int treeGone) /* Non-zero means the entire tree is being * deleted, so everything must get cleaned * up. */ { return 1; } /* *-------------------------------------------------------------- * * MarkCleanupProc -- * * This function is invoked by the B-tree code whenever a mark segment is * moved from one line to another. * * Results: * None. * * Side effects: * The linePtr field of the segment gets updated. * *-------------------------------------------------------------- */ static TkTextSegment * MarkCleanupProc( TkTextSegment *markPtr, /* Mark segment that's being moved. */ TkTextLine *linePtr) /* Line that now contains segment. */ { markPtr->body.mark.linePtr = linePtr; return markPtr; } /* *-------------------------------------------------------------- * * MarkLayoutProc -- * * This function is the "layoutProc" for mark segments. * * Results: * If the mark isn't the insertion cursor then the return value is -1 to * indicate that this segment shouldn't be displayed. If the mark is the * insertion character then 1 is returned and the chunkPtr structure is * filled in. * * Side effects: * None, except for filling in chunkPtr. * *-------------------------------------------------------------- */ static int MarkLayoutProc( TkText *textPtr, /* Text widget being layed out. */ TkTextIndex *indexPtr, /* Identifies first character in chunk. */ TkTextSegment *segPtr, /* Segment corresponding to indexPtr. */ int offset, /* Offset within segPtr corresponding to * indexPtr (always 0). */ int maxX, /* Chunk must not occupy pixels at this * position or higher. */ int maxChars, /* Chunk must not include more than this many * characters. */ int noCharsYet, /* Non-zero means no characters have been * assigned to this line yet. */ TkWrapMode wrapMode, /* Not used. */ register TkTextDispChunk *chunkPtr) /* Structure to fill in with information about * this chunk. The x field has already been * set by the caller. */ { if (segPtr != textPtr->insertMarkPtr) { return -1; } chunkPtr->displayProc = TkTextInsertDisplayProc; chunkPtr->undisplayProc = InsertUndisplayProc; chunkPtr->measureProc = NULL; chunkPtr->bboxProc = NULL; chunkPtr->numBytes = 0; chunkPtr->minAscent = 0; chunkPtr->minDescent = 0; chunkPtr->minHeight = 0; chunkPtr->width = 0; /* * Note: can't break a line after the insertion cursor: this prevents the * insertion cursor from being stranded at the end of a line. */ chunkPtr->breakIndex = -1; chunkPtr->clientData = (ClientData) textPtr; return 1; } /* *-------------------------------------------------------------- * * TkTextInsertDisplayProc -- * * This function is called to display the insertion cursor. * * Results: * None. * * Side effects: * Graphics are drawn. * *-------------------------------------------------------------- */ /* ARGSUSED */ void TkTextInsertDisplayProc( TkText *textPtr, /* The current text widget. */ TkTextDispChunk *chunkPtr, /* Chunk that is to be drawn. */ int x, /* X-position in dst at which to draw this * chunk (may differ from the x-position in * the chunk because of scrolling). */ int y, /* Y-position at which to draw this chunk in * dst (x-position is in the chunk itself). */ int height, /* Total height of line. */ int baseline, /* Offset of baseline from y. */ Display *display, /* Display to use for drawing. */ Drawable dst, /* Pixmap or window in which to draw chunk. */ int screenY) /* Y-coordinate in text window that * corresponds to y. */ { /* * We have no need for the clientData. */ /* TkText *textPtr = (TkText *) chunkPtr->clientData; */ TkTextIndex index; int halfWidth = textPtr->insertWidth/2; int rightSideWidth; int ix = 0, iy = 0, iw = 0, ih = 0, charWidth = 0; if(textPtr->insertCursorType) { TkTextMarkSegToIndex(textPtr, textPtr->insertMarkPtr, &index); TkTextIndexBbox(textPtr, &index, &ix, &iy, &iw, &ih, &charWidth); rightSideWidth = charWidth + halfWidth; } else { rightSideWidth = halfWidth; } if ((x + rightSideWidth) < 0) { /* * The insertion cursor is off-screen. Indicate caret at 0,0 and * return. */ Tk_SetCaretPos(textPtr->tkwin, 0, 0, height); return; } Tk_SetCaretPos(textPtr->tkwin, x - halfWidth, screenY, height); /* * As a special hack to keep the cursor visible on mono displays (or * anywhere else that the selection and insertion cursors have the same * color) write the default background in the cursor area (instead of * nothing) when the cursor isn't on. Otherwise the selection might hide * the cursor. */ if (textPtr->flags & INSERT_ON) { Tk_Fill3DRectangle(textPtr->tkwin, dst, textPtr->insertBorder, x - halfWidth, y, charWidth + textPtr->insertWidth, height, textPtr->insertBorderWidth, TK_RELIEF_RAISED); } else if (textPtr->selBorder == textPtr->insertBorder) { Tk_Fill3DRectangle(textPtr->tkwin, dst, textPtr->border, x - halfWidth, y, charWidth + textPtr->insertWidth, height, 0, TK_RELIEF_FLAT); } } /* *-------------------------------------------------------------- * * InsertUndisplayProc -- * * This function is called when the insertion cursor is no longer at a * visible point on the display. It does nothing right now. * * Results: * None. * * Side effects: * None. * *-------------------------------------------------------------- */ /* ARGSUSED */ static void InsertUndisplayProc( TkText *textPtr, /* Overall information about text widget. */ TkTextDispChunk *chunkPtr) /* Chunk that is about to be freed. */ { return; } /* *-------------------------------------------------------------- * * MarkCheckProc -- * * This function is invoked by the B-tree code to perform consistency * checks on mark segments. * * Results: * None. * * Side effects: * The function panics if it detects anything wrong with * the mark. * *-------------------------------------------------------------- */ static void MarkCheckProc( TkTextSegment *markPtr, /* Segment to check. */ TkTextLine *linePtr) /* Line containing segment. */ { Tcl_HashSearch search; Tcl_HashEntry *hPtr; if (markPtr->body.mark.linePtr != linePtr) { Tcl_Panic("MarkCheckProc: markPtr->body.mark.linePtr bogus"); } /* * These two marks are not in the hash table */ if (markPtr->body.mark.textPtr->insertMarkPtr == markPtr) { return; } if (markPtr->body.mark.textPtr->currentMarkPtr == markPtr) { return; } /* * Make sure that the mark is still present in the text's mark hash table. */ for (hPtr = Tcl_FirstHashEntry( &markPtr->body.mark.textPtr->sharedTextPtr->markTable, &search); hPtr != markPtr->body.mark.hPtr; hPtr = Tcl_NextHashEntry(&search)) { if (hPtr == NULL) { Tcl_Panic("MarkCheckProc couldn't find hash table entry for mark"); } } } /* *-------------------------------------------------------------- * * MarkFindNext -- * * This function searches forward for the next mark. * * Results: * A standard Tcl result, which is a mark name or an empty string. * * Side effects: * None. * *-------------------------------------------------------------- */ static int MarkFindNext( Tcl_Interp *interp, /* For error reporting */ TkText *textPtr, /* The widget */ const char *string) /* The starting index or mark name */ { TkTextIndex index; Tcl_HashEntry *hPtr; register TkTextSegment *segPtr; int offset; if (!strcmp(string, "insert")) { segPtr = textPtr->insertMarkPtr; TkTextMarkSegToIndex(textPtr, segPtr, &index); segPtr = segPtr->nextPtr; } else if (!strcmp(string, "current")) { segPtr = textPtr->currentMarkPtr; TkTextMarkSegToIndex(textPtr, segPtr, &index); segPtr = segPtr->nextPtr; } else { hPtr = Tcl_FindHashEntry(&textPtr->sharedTextPtr->markTable, string); if (hPtr != NULL) { /* * If given a mark name, return the next mark in the list of * segments, even if it happens to be at the same character * position. */ segPtr = (TkTextSegment *) Tcl_GetHashValue(hPtr); TkTextMarkSegToIndex(textPtr, segPtr, &index); segPtr = segPtr->nextPtr; } else { /* * For non-mark name indices we want to return any marks that are * right at the index. */ if (TkTextGetIndex(interp, textPtr, string, &index) != TCL_OK) { return TCL_ERROR; } for (offset = 0, segPtr = index.linePtr->segPtr; segPtr != NULL && offset < index.byteIndex; offset += segPtr->size, segPtr = segPtr->nextPtr) { /* Empty loop body */ ; } } } while (1) { /* * segPtr points at the first possible candidate, or NULL if we ran * off the end of the line. */ for ( ; segPtr != NULL ; segPtr = segPtr->nextPtr) { if (segPtr->typePtr == &tkTextRightMarkType || segPtr->typePtr == &tkTextLeftMarkType) { if (segPtr == textPtr->currentMarkPtr) { Tcl_SetResult(interp, "current", TCL_STATIC); } else if (segPtr == textPtr->insertMarkPtr) { Tcl_SetResult(interp, "insert", TCL_STATIC); } else if (segPtr->body.mark.hPtr == NULL) { /* * Ignore widget-specific marks for the other widgets. * This is either an insert or a current mark * (markPtr->body.mark.hPtr actually receives NULL * for these marks in TkTextSetMark). * The insert and current marks for textPtr having * already been tested above, the current segment is * an insert or current mark from a peer of textPtr, * which we don't want to return. */ continue; } else { Tcl_SetResult(interp, Tcl_GetHashKey(&textPtr->sharedTextPtr->markTable, segPtr->body.mark.hPtr), TCL_STATIC); } return TCL_OK; } } index.linePtr = TkBTreeNextLine(textPtr, index.linePtr); if (index.linePtr == NULL) { return TCL_OK; } index.byteIndex = 0; segPtr = index.linePtr->segPtr; } } /* *-------------------------------------------------------------- * * MarkFindPrev -- * * This function searches backwards for the previous mark. * * Results: * A standard Tcl result, which is a mark name or an empty string. * * Side effects: * None. * *-------------------------------------------------------------- */ static int MarkFindPrev( Tcl_Interp *interp, /* For error reporting */ TkText *textPtr, /* The widget */ const char *string) /* The starting index or mark name */ { TkTextIndex index; Tcl_HashEntry *hPtr; register TkTextSegment *segPtr, *seg2Ptr, *prevPtr; int offset; if (!strcmp(string, "insert")) { segPtr = textPtr->insertMarkPtr; TkTextMarkSegToIndex(textPtr, segPtr, &index); } else if (!strcmp(string, "current")) { segPtr = textPtr->currentMarkPtr; TkTextMarkSegToIndex(textPtr, segPtr, &index); } else { hPtr = Tcl_FindHashEntry(&textPtr->sharedTextPtr->markTable, string); if (hPtr != NULL) { /* * If given a mark name, return the previous mark in the list of * segments, even if it happens to be at the same character * position. */ segPtr = (TkTextSegment *) Tcl_GetHashValue(hPtr); TkTextMarkSegToIndex(textPtr, segPtr, &index); } else { /* * For non-mark name indices we do not return any marks that are * right at the index. */ if (TkTextGetIndex(interp, textPtr, string, &index) != TCL_OK) { return TCL_ERROR; } for (offset = 0, segPtr = index.linePtr->segPtr; segPtr != NULL && offset < index.byteIndex; offset += segPtr->size, segPtr = segPtr->nextPtr) { /* Empty loop body */ } } } while (1) { /* * segPtr points just past the first possible candidate, or at the * beginning of the line. */ for (prevPtr = NULL, seg2Ptr = index.linePtr->segPtr; seg2Ptr != NULL && seg2Ptr != segPtr; seg2Ptr = seg2Ptr->nextPtr) { if (seg2Ptr->typePtr == &tkTextRightMarkType || seg2Ptr->typePtr == &tkTextLeftMarkType) { if (seg2Ptr->body.mark.hPtr == NULL) { if (seg2Ptr != textPtr->currentMarkPtr && seg2Ptr != textPtr->insertMarkPtr) { /* * This is an insert or current mark from a * peer of textPtr. */ continue; } } prevPtr = seg2Ptr; } } if (prevPtr != NULL) { if (prevPtr == textPtr->currentMarkPtr) { Tcl_SetResult(interp, "current", TCL_STATIC); return TCL_OK; } else if (prevPtr == textPtr->insertMarkPtr) { Tcl_SetResult(interp, "insert", TCL_STATIC); return TCL_OK; } else if (prevPtr->body.mark.hPtr == NULL) { /* * Ignore widget-specific marks for the other widgets. * This is either an insert or a current mark * (markPtr->body.mark.hPtr actually receives NULL * for these marks in TkTextSetMark). * The insert and current marks for textPtr having * already been tested above, the current segment is * an insert or current mark from a peer of textPtr, * which we don't want to return. */ } else { Tcl_SetResult(interp, Tcl_GetHashKey(&textPtr->sharedTextPtr->markTable, prevPtr->body.mark.hPtr), TCL_STATIC); return TCL_OK; } } index.linePtr = TkBTreePreviousLine(textPtr, index.linePtr); if (index.linePtr == NULL) { return TCL_OK; } segPtr = NULL; } } /* * Local Variables: * mode: c * c-basic-offset: 4 * fill-column: 78 * End: */


context:
space:
mode: