/* * tkTextMark.c -- * * This file contains the procedure 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. * * SCCS: @(#) tkTextMark.c 1.18 97/10/20 11:12:50 */ #include "tkInt.h" #include "tkText.h" #include "tkPort.h" /* * Macro that determines the size of a mark segment: */ #define MSEG_SIZE ((unsigned) (Tk_Offset(TkTextSegment, body) \ + sizeof(TkTextMark))) /* * Forward references for procedures defined in this file: */ static void InsertUndisplayProc _ANSI_ARGS_((TkText *textPtr, TkTextDispChunk *chunkPtr)); static int MarkDeleteProc _ANSI_ARGS_((TkTextSegment *segPtr, TkTextLine *linePtr, int treeGone)); static TkTextSegment * MarkCleanupProc _ANSI_ARGS_((TkTextSegment *segPtr, TkTextLine *linePtr)); static void MarkCheckProc _ANSI_ARGS_((TkTextSegment *segPtr, TkTextLine *linePtr)); static int MarkLayoutProc _ANSI_ARGS_((TkText *textPtr, TkTextIndex *indexPtr, TkTextSegment *segPtr, int offset, int maxX, int maxChars, int noCharsYet, Tk_Uid wrapMode, TkTextDispChunk *chunkPtr)); static int MarkFindNext _ANSI_ARGS_((Tcl_Interp *interp, TkText *textPtr, char *markName)); static int MarkFindPrev _ANSI_ARGS_((Tcl_Interp *interp, TkText *textPtr, 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. */ Tk_SegType tkTextRightMarkType = { "mark", /* name */ 0, /* leftGravity */ (Tk_SegSplitProc *) NULL, /* splitProc */ MarkDeleteProc, /* deleteProc */ MarkCleanupProc, /* cleanupProc */ (Tk_SegLineChangeProc *) NULL, /* lineChangeProc */ MarkLayoutProc, /* layoutProc */ MarkCheckProc /* checkProc */ }; Tk_SegType tkTextLeftMarkType = { "mark", /* name */ 1, /* leftGravity */ (Tk_SegSplitProc *) NULL, /* splitProc */ MarkDeleteProc, /* deleteProc */ MarkCleanupProc, /* cleanupProc */ (Tk_SegLineChangeProc *) NULL, /* lineChangeProc */ MarkLayoutProc, /* layoutProc */ MarkCheckProc /* checkProc */ }; /* *-------------------------------------------------------------- * * TkTextMarkCmd -- * * This procedure 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(textPtr, interp, argc, argv) register TkText *textPtr; /* Information about text widget. */ Tcl_Interp *interp; /* Current interpreter. */ int argc; /* Number of arguments. */ char **argv; /* Argument strings. Someone else has already * parsed this command enough to know that * argv[1] is "mark". */ { int c, i; size_t length; Tcl_HashEntry *hPtr; TkTextSegment *markPtr; Tcl_HashSearch search; TkTextIndex index; Tk_SegType *newTypePtr; if (argc < 3) { Tcl_AppendResult(interp, "wrong # args: should be \"", argv[0], " mark option ?arg arg ...?\"", (char *) NULL); return TCL_ERROR; } c = argv[2][0]; length = strlen(argv[2]); if ((c == 'g') && (strncmp(argv[2], "gravity", length) == 0)) { if (argc < 4 || argc > 5) { Tcl_AppendResult(interp, "wrong # args: should be \"", argv[0], " mark gravity markName ?gravity?\"", (char *) NULL); return TCL_ERROR; } hPtr = Tcl_FindHashEntry(&textPtr->markTable, argv[3]); if (hPtr == NULL) { Tcl_AppendResult(interp, "there is no mark named \"", argv[3], "\"", (char *) NULL); return TCL_ERROR; } markPtr = (TkTextSegment *) Tcl_GetHashValue(hPtr); if (argc == 4) { if (markPtr->typePtr == &tkTextRightMarkType) { #ifdef STk_CODE interp->result = "\"right\""; } else { interp->result = "\"left\""; #else interp->result = "right"; } else { interp->result = "left"; #endif } return TCL_OK; } length = strlen(argv[4]); c = argv[4][0]; if ((c == 'l') && (strncmp(argv[4], "left", length) == 0)) { newTypePtr = &tkTextLeftMarkType; } else if ((c == 'r') && (strncmp(argv[4], "right", length) == 0)) { newTypePtr = &tkTextRightMarkType; } else { Tcl_AppendResult(interp, "bad mark gravity \"", argv[4], "\": must be left or right", (char *) NULL); return TCL_ERROR; } TkTextMarkSegToIndex(textPtr, markPtr, &index); TkBTreeUnlinkSegment(textPtr->tree, markPtr, markPtr->body.mark.linePtr); markPtr->typePtr = newTypePtr; TkBTreeLinkSegment(markPtr, &index); } else if ((c == 'n') && (strncmp(argv[2], "names", length) == 0)) { if (argc != 3) { Tcl_AppendResult(interp, "wrong # args: should be \"", argv[0], " mark names\"", (char *) NULL); return TCL_ERROR; } for (hPtr = Tcl_FirstHashEntry(&textPtr->markTable, &search); hPtr != NULL; hPtr = Tcl_NextHashEntry(&search)) { Tcl_AppendElement(interp, Tcl_GetHashKey(&textPtr->markTable, hPtr)); } } else if ((c == 'n') && (strncmp(argv[2], "next", length) == 0)) { if (argc != 4) { Tcl_AppendResult(interp, "wrong # args: should be \"", argv[0], " mark next index\"", (char *) NULL); return TCL_ERROR; } return MarkFindNext(interp, textPtr, argv[3]); } else if ((c == 'p') && (strncmp(argv[2], "previous", length) == 0)) { if (argc != 4) { Tcl_AppendResult(interp, "wrong # args: should be \"", argv[0], " mark previous index\"", (char *) NULL); return TCL_ERROR; } return MarkFindPrev(interp, textPtr, argv[3]); } else if ((c == 's') && (strncmp(argv[2], "set", length) == 0)) { if (argc != 5) { Tcl_AppendResult(interp, "wrong # args: should be \"", argv[0], " mark set markName index\"", (char *) NULL); return TCL_ERROR; } if (TkTextGetIndex(interp, textPtr, argv[4], &index) != TCL_OK) { return TCL_ERROR; } TkTextSetMark(textPtr, argv[3], &index); } else if ((c == 'u') && (strncmp(argv[2], "unset", length) == 0)) { for (i = 3; i < argc; i++) { hPtr = Tcl_FindHashEntry(&textPtr->markTable, argv[i]); if (hPtr != NULL) { markPtr = (TkTextSegment *) Tcl_GetHashValue(hPtr); if ((markPtr == textPtr->insertMarkPtr) || (markPtr == textPtr->currentMarkPtr)) { continue; } TkBTreeUnlinkSegment(textPtr->tree, markPtr, markPtr->body.mark.linePtr); Tcl_DeleteHashEntry(hPtr); ckfree((char *) markPtr); } } } else { Tcl_AppendResult(interp, "bad mark option \"", argv[2], "\": must be gravity, names, next, previous, set, or unset", (char *) NULL); return TCL_ERROR; } 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(textPtr, name, indexPtr) TkText *textPtr; /* Text widget in which to create mark. */ char *name; /* Name of mark to set. */ TkTextIndex *indexPtr; /* Where to set mark. */ { Tcl_HashEntry *hPtr; TkTextSegment *markPtr; TkTextIndex insertIndex; int new; hPtr = Tcl_CreateHashEntry(&textPtr->markTable, name, &new); markPtr = (TkTextSegment *) Tcl_GetHashValue(hPtr); if (!new) { /* * 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; TkTextMarkSegToIndex(textPtr, textPtr->insertMarkPtr, &index); TkTextIndexForwChars(&index, 1, &index2); TkTextChanged(textPtr, &index, &index2); if (TkBTreeLineIndex(indexPtr->linePtr) == TkBTreeNumLines(textPtr->tree)) { TkTextIndexBackChars(indexPtr, 1, &insertIndex); indexPtr = &insertIndex; } } TkBTreeUnlinkSegment(textPtr->tree, 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; Tcl_SetHashValue(hPtr, 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(indexPtr, 1, &index2); TkTextChanged(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(textPtr, markPtr, indexPtr) TkText *textPtr; /* Text widget containing mark. */ TkTextSegment *markPtr; /* Mark segment. */ TkTextIndex *indexPtr; /* Index information gets stored here. */ { TkTextSegment *segPtr; indexPtr->tree = textPtr->tree; indexPtr->linePtr = markPtr->body.mark.linePtr; indexPtr->charIndex = 0; for (segPtr = indexPtr->linePtr->segPtr; segPtr != markPtr; segPtr = segPtr->nextPtr) { indexPtr->charIndex += 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. In this case *indexPtr is filled in with * the next segment whose after the mark whose size is * non-zero. TCL_ERROR is returned if the mark doesn't exist * in the text widget. * * Side effects: * None. * *-------------------------------------------------------------- */ int TkTextMarkNameToIndex(textPtr, name, indexPtr) TkText *textPtr; /* Text widget containing mark. */ char *name; /* Name of mark. */ TkTextIndex *indexPtr; /* Index information gets stored here. */ { Tcl_HashEntry *hPtr; hPtr = Tcl_FindHashEntry(&textPtr->markTable, name); if (hPtr == NULL) { return TCL_ERROR; } TkTextMarkSegToIndex(textPtr, (TkTextSegment *) Tcl_GetHashValue(hPtr), indexPtr); return TCL_OK; } /* *-------------------------------------------------------------- * * MarkDeleteProc -- * * This procedure 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(segPtr, linePtr, treeGone) 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 procedure 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(markPtr, linePtr) TkTextSegment *markPtr; /* Mark segment that's being moved. */ TkTextLine *linePtr; /* Line that now contains segment. */ { markPtr->body.mark.linePtr = linePtr; return markPtr; } /* *-------------------------------------------------------------- * * MarkLayoutProc -- * * This procedure 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. * *-------------------------------------------------------------- */ /*ARGSUSED*/ static int MarkLayoutProc(textPtr, indexPtr, segPtr, offset, maxX, maxChars, noCharsYet, wrapMode, chunkPtr) 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. */ Tk_Uid 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 = (Tk_ChunkMeasureProc *) NULL; chunkPtr->bboxProc = (Tk_ChunkBboxProc *) NULL; chunkPtr->numChars = 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 procedure is called to display the insertion * cursor. * * Results: * None. * * Side effects: * Graphics are drawn. * *-------------------------------------------------------------- */ /* ARGSUSED */ void TkTextInsertDisplayProc(chunkPtr, x, y, height, baseline, display, dst, screenY) 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. */ { TkText *textPtr = (TkText *) chunkPtr->clientData; int halfWidth = textPtr->insertWidth/2; if ((x + halfWidth) < 0) { /* * The insertion cursor is off-screen. Just return. */ return; } /* * 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 - textPtr->insertWidth/2, y, textPtr->insertWidth, height, textPtr->insertBorderWidth, TK_RELIEF_RAISED); } else if (textPtr->selBorder == textPtr->insertBorder) { Tk_Fill3DRectangle(textPtr->tkwin, dst, textPtr->border, x - textPtr->insertWidth/2, y, textPtr->insertWidth, height, 0, TK_RELIEF_FLAT); } } /* *-------------------------------------------------------------- * * InsertUndisplayProc -- * * This procedure 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(textPtr, chunkPtr) TkText *textPtr; /* Overall information about text * widget. */ TkTextDispChunk *chunkPtr; /* Chunk that is about to be freed. */ { return; } /* *-------------------------------------------------------------- * * MarkCheckProc -- * * This procedure is invoked by the B-tree code to perform * consistency checks on mark segments. * * Results: * None. * * Side effects: * The procedure panics if it detects anything wrong with * the mark. * *-------------------------------------------------------------- */ static void MarkCheckProc(markPtr, linePtr) TkTextSegment *markPtr; /* Segment to check. */ TkTextLine *linePtr; /* Line containing segment. */ { Tcl_HashSearch search; Tcl_HashEntry *hPtr; if (markPtr->body.mark.linePtr != linePtr) { panic("MarkCheckProc: markPtr->body.mark.linePtr bogus"); } /* * Make sure that the mark is still present in the text's mark * hash table. */ for (hPtr = Tcl_FirstHashEntry(&markPtr->body.mark.textPtr->markTable, &search); hPtr != markPtr->body.mark.hPtr; hPtr = Tcl_NextHashEntry(&search)) { if (hPtr == NULL) { panic("MarkCheckProc couldn't find hash table entry for mark"); } } } /* *-------------------------------------------------------------- * * MarkFindNext -- * * This procedure 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(interp, textPtr, string) Tcl_Interp *interp; /* For error reporting */ TkText *textPtr; /* The widget */ char *string; /* The starting index or mark name */ { TkTextIndex index; Tcl_HashEntry *hPtr; register TkTextSegment *segPtr; int offset; hPtr = Tcl_FindHashEntry(&textPtr->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.charIndex; 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) { Tcl_SetResult(interp, Tcl_GetHashKey(&textPtr->markTable, segPtr->body.mark.hPtr), TCL_STATIC); return TCL_OK; } } index.linePtr = TkBTreeNextLine(index.linePtr); if (index.linePtr == (TkTextLine *) NULL) { return TCL_OK; } index.charIndex = 0; segPtr = index.linePtr->segPtr; } } /* *-------------------------------------------------------------- * * MarkFindPrev -- * * This procedure 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(interp, textPtr, string) Tcl_Interp *interp; /* For error reporting */ TkText *textPtr; /* The widget */ char *string; /* The starting index or mark name */ { TkTextIndex index; Tcl_HashEntry *hPtr; register TkTextSegment *segPtr, *seg2Ptr, *prevPtr; int offset; hPtr = Tcl_FindHashEntry(&textPtr->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.charIndex; offset += segPtr->size, segPtr = segPtr->nextPtr) { /* Empty loop body */ ; } } while (1) { /* * segPtr points just past the first possible candidate, * or at the begining of the line. */ for (prevPtr = NULL, seg2Ptr = index.linePtr->segPtr; seg2Ptr != NULL && seg2Ptr != segPtr; seg2Ptr = seg2Ptr->nextPtr) { if (seg2Ptr->typePtr == &tkTextRightMarkType || seg2Ptr->typePtr == &tkTextLeftMarkType) { prevPtr = seg2Ptr; } } if (prevPtr != NULL) { Tcl_SetResult(interp, Tcl_GetHashKey(&textPtr->markTable, prevPtr->body.mark.hPtr), TCL_STATIC); return TCL_OK; } index.linePtr = TkBTreePreviousLine(index.linePtr); if (index.linePtr == (TkTextLine *) NULL) { return TCL_OK; } segPtr = NULL; } }