/* * tkCanvText.c -- * * This file implements text items for canvas widgets. * * Copyright (c) 1991-1994 The Regents of the University of California. * Copyright (c) 1994-1995 Sun Microsystems, Inc. * * See the file "license.terms" for information on usage and redistribution * of this file, and for a DISCLAIMER OF ALL WARRANTIES. * * RCS: @(#) $Id: tkCanvText.c,v 1.2 1998/09/14 18:23:05 stanton Exp $ */ #include #include "tkInt.h" #include "tkCanvas.h" #include "tkPort.h" #include "default.h" /* * The structure below defines the record for each text item. */ typedef struct TextItem { Tk_Item header; /* Generic stuff that's the same for all * types. MUST BE FIRST IN STRUCTURE. */ Tk_CanvasTextInfo *textInfoPtr; /* Pointer to a structure containing * information about the selection and * insertion cursor. The structure is owned * by (and shared with) the generic canvas * code. */ /* * Fields that are set by widget commands other than "configure". */ double x, y; /* Positioning point for text. */ int insertPos; /* Insertion cursor is displayed just to left * of character with this index. */ /* * Configuration settings that are updated by Tk_ConfigureWidget. */ Tk_Anchor anchor; /* Where to anchor text relative to (x,y). */ XColor *color; /* Color for text. */ Tk_Font tkfont; /* Font for drawing text. */ Tk_Justify justify; /* Justification mode for text. */ Pixmap stipple; /* Stipple bitmap for text, or None. */ char *text; /* Text for item (malloc-ed). */ int width; /* Width of lines for word-wrap, pixels. * Zero means no word-wrap. */ /* * Fields whose values are derived from the current values of the * configuration settings above. */ int numChars; /* Number of non-NULL characters in text. */ Tk_TextLayout textLayout; /* Cached text layout information. */ int leftEdge; /* Pixel location of the left edge of the * text item; where the left border of the * text layout is drawn. */ int rightEdge; /* Pixel just to right of right edge of * area of text item. Used for selecting up * to end of line. */ GC gc; /* Graphics context for drawing text. */ GC selTextGC; /* Graphics context for selected text. */ GC cursorOffGC; /* If not None, this gives a graphics context * to use to draw the insertion cursor when * it's off. Used if the selection and * insertion cursor colors are the same. */ } TextItem; /* * Information used for parsing configuration specs: */ static Tk_CustomOption tagsOption = {Tk_CanvasTagsParseProc, Tk_CanvasTagsPrintProc, (ClientData) NULL }; static Tk_ConfigSpec configSpecs[] = { {TK_CONFIG_ANCHOR, "-anchor", (char *) NULL, (char *) NULL, "center", Tk_Offset(TextItem, anchor), TK_CONFIG_DONT_SET_DEFAULT}, {TK_CONFIG_COLOR, "-fill", (char *) NULL, (char *) NULL, "black", Tk_Offset(TextItem, color), 0}, {TK_CONFIG_FONT, "-font", (char *) NULL, (char *) NULL, DEF_CANVTEXT_FONT, Tk_Offset(TextItem, tkfont), 0}, {TK_CONFIG_JUSTIFY, "-justify", (char *) NULL, (char *) NULL, "left", Tk_Offset(TextItem, justify), TK_CONFIG_DONT_SET_DEFAULT}, {TK_CONFIG_BITMAP, "-stipple", (char *) NULL, (char *) NULL, (char *) NULL, Tk_Offset(TextItem, stipple), TK_CONFIG_NULL_OK}, {TK_CONFIG_CUSTOM, "-tags", (char *) NULL, (char *) NULL, (char *) NULL, 0, TK_CONFIG_NULL_OK, &tagsOption}, {TK_CONFIG_STRING, "-text", (char *) NULL, (char *) NULL, "", Tk_Offset(TextItem, text), 0}, {TK_CONFIG_PIXELS, "-width", (char *) NULL, (char *) NULL, "0", Tk_Offset(TextItem, width), TK_CONFIG_DONT_SET_DEFAULT}, {TK_CONFIG_END, (char *) NULL, (char *) NULL, (char *) NULL, (char *) NULL, 0, 0} }; /* * Prototypes for procedures defined in this file: */ static void ComputeTextBbox _ANSI_ARGS_((Tk_Canvas canvas, TextItem *textPtr)); static int ConfigureText _ANSI_ARGS_((Tcl_Interp *interp, Tk_Canvas canvas, Tk_Item *itemPtr, int argc, char **argv, int flags)); static int CreateText _ANSI_ARGS_((Tcl_Interp *interp, Tk_Canvas canvas, struct Tk_Item *itemPtr, int argc, char **argv)); static void DeleteText _ANSI_ARGS_((Tk_Canvas canvas, Tk_Item *itemPtr, Display *display)); static void DisplayCanvText _ANSI_ARGS_((Tk_Canvas canvas, Tk_Item *itemPtr, Display *display, Drawable dst, int x, int y, int width, int height)); static int GetSelText _ANSI_ARGS_((Tk_Canvas canvas, Tk_Item *itemPtr, int offset, char *buffer, int maxBytes)); static int GetTextIndex _ANSI_ARGS_((Tcl_Interp *interp, Tk_Canvas canvas, Tk_Item *itemPtr, char *indexString, int *indexPtr)); static void ScaleText _ANSI_ARGS_((Tk_Canvas canvas, Tk_Item *itemPtr, double originX, double originY, double scaleX, double scaleY)); static void SetTextCursor _ANSI_ARGS_((Tk_Canvas canvas, Tk_Item *itemPtr, int index)); static int TextCoords _ANSI_ARGS_((Tcl_Interp *interp, Tk_Canvas canvas, Tk_Item *itemPtr, int argc, char **argv)); static void TextDeleteChars _ANSI_ARGS_((Tk_Canvas canvas, Tk_Item *itemPtr, int first, int last)); static void TextInsert _ANSI_ARGS_((Tk_Canvas canvas, Tk_Item *itemPtr, int beforeThis, char *string)); static int TextToArea _ANSI_ARGS_((Tk_Canvas canvas, Tk_Item *itemPtr, double *rectPtr)); static double TextToPoint _ANSI_ARGS_((Tk_Canvas canvas, Tk_Item *itemPtr, double *pointPtr)); static int TextToPostscript _ANSI_ARGS_((Tcl_Interp *interp, Tk_Canvas canvas, Tk_Item *itemPtr, int prepass)); static void TranslateText _ANSI_ARGS_((Tk_Canvas canvas, Tk_Item *itemPtr, double deltaX, double deltaY)); /* * The structures below defines the rectangle and oval item types * by means of procedures that can be invoked by generic item code. */ Tk_ItemType tkTextType = { "text", /* name */ sizeof(TextItem), /* itemSize */ CreateText, /* createProc */ configSpecs, /* configSpecs */ ConfigureText, /* configureProc */ TextCoords, /* coordProc */ DeleteText, /* deleteProc */ DisplayCanvText, /* displayProc */ 0, /* alwaysRedraw */ TextToPoint, /* pointProc */ TextToArea, /* areaProc */ TextToPostscript, /* postscriptProc */ ScaleText, /* scaleProc */ TranslateText, /* translateProc */ GetTextIndex, /* indexProc */ SetTextCursor, /* icursorProc */ GetSelText, /* selectionProc */ TextInsert, /* insertProc */ TextDeleteChars, /* dTextProc */ (Tk_ItemType *) NULL /* nextPtr */ }; /* *-------------------------------------------------------------- * * CreateText -- * * This procedure is invoked to create a new text item * in a canvas. * * Results: * A standard Tcl return value. If an error occurred in * creating the item then an error message is left in * interp->result; in this case itemPtr is left uninitialized * so it can be safely freed by the caller. * * Side effects: * A new text item is created. * *-------------------------------------------------------------- */ static int CreateText(interp, canvas, itemPtr, argc, argv) Tcl_Interp *interp; /* Interpreter for error reporting. */ Tk_Canvas canvas; /* Canvas to hold new item. */ Tk_Item *itemPtr; /* Record to hold new item; header * has been initialized by caller. */ int argc; /* Number of arguments in argv. */ char **argv; /* Arguments describing rectangle. */ { TextItem *textPtr = (TextItem *) itemPtr; if (argc < 2) { Tcl_AppendResult(interp, "wrong # args: should be \"", Tk_PathName(Tk_CanvasTkwin(canvas)), " create ", itemPtr->typePtr->name, " x y ?options?\"", (char *) NULL); return TCL_ERROR; } /* * Carry out initialization that is needed in order to clean * up after errors during the the remainder of this procedure. */ textPtr->textInfoPtr = Tk_CanvasGetTextInfo(canvas); textPtr->insertPos = 0; textPtr->anchor = TK_ANCHOR_CENTER; textPtr->color = NULL; textPtr->tkfont = NULL; textPtr->justify = TK_JUSTIFY_LEFT; textPtr->stipple = None; textPtr->text = NULL; textPtr->width = 0; textPtr->numChars = 0; textPtr->textLayout = NULL; textPtr->leftEdge = 0; textPtr->rightEdge = 0; textPtr->gc = None; textPtr->selTextGC = None; textPtr->cursorOffGC = None; /* * Process the arguments to fill in the item record. */ if ((Tk_CanvasGetCoord(interp, canvas, argv[0], &textPtr->x) != TCL_OK) || (Tk_CanvasGetCoord(interp, canvas, argv[1], &textPtr->y) != TCL_OK)) { return TCL_ERROR; } if (ConfigureText(interp, canvas, itemPtr, argc-2, argv+2, 0) != TCL_OK) { DeleteText(canvas, itemPtr, Tk_Display(Tk_CanvasTkwin(canvas))); return TCL_ERROR; } return TCL_OK; } /* *-------------------------------------------------------------- * * TextCoords -- * * This procedure is invoked to process the "coords" widget * command on text items. See the user documentation for * details on what it does. * * Results: * Returns TCL_OK or TCL_ERROR, and sets interp->result. * * Side effects: * The coordinates for the given item may be changed. * *-------------------------------------------------------------- */ static int TextCoords(interp, canvas, itemPtr, argc, argv) Tcl_Interp *interp; /* Used for error reporting. */ Tk_Canvas canvas; /* Canvas containing item. */ Tk_Item *itemPtr; /* Item whose coordinates are to be * read or modified. */ int argc; /* Number of coordinates supplied in * argv. */ char **argv; /* Array of coordinates: x1, y1, * x2, y2, ... */ { TextItem *textPtr = (TextItem *) itemPtr; char x[TCL_DOUBLE_SPACE], y[TCL_DOUBLE_SPACE]; if (argc == 0) { Tcl_PrintDouble(interp, textPtr->x, x); Tcl_PrintDouble(interp, textPtr->y, y); Tcl_AppendResult(interp, x, " ", y, (char *) NULL); } else if (argc == 2) { if ((Tk_CanvasGetCoord(interp, canvas, argv[0], &textPtr->x) != TCL_OK) || (Tk_CanvasGetCoord(interp, canvas, argv[1], &textPtr->y) != TCL_OK)) { return TCL_ERROR; } ComputeTextBbox(canvas, textPtr); } else { sprintf(interp->result, "wrong # coordinates: expected 0 or 2, got %d", argc); return TCL_ERROR; } return TCL_OK; } /* *-------------------------------------------------------------- * * ConfigureText -- * * This procedure is invoked to configure various aspects * of a text item, such as its border and background colors. * * Results: * A standard Tcl result code. If an error occurs, then * an error message is left in interp->result. * * Side effects: * Configuration information, such as colors and stipple * patterns, may be set for itemPtr. * *-------------------------------------------------------------- */ static int ConfigureText(interp, canvas, itemPtr, argc, argv, flags) Tcl_Interp *interp; /* Interpreter for error reporting. */ Tk_Canvas canvas; /* Canvas containing itemPtr. */ Tk_Item *itemPtr; /* Rectangle item to reconfigure. */ int argc; /* Number of elements in argv. */ char **argv; /* Arguments describing things to configure. */ int flags; /* Flags to pass to Tk_ConfigureWidget. */ { TextItem *textPtr = (TextItem *) itemPtr; XGCValues gcValues; GC newGC, newSelGC; unsigned long mask; Tk_Window tkwin; Tk_CanvasTextInfo *textInfoPtr = textPtr->textInfoPtr; XColor *selBgColorPtr; tkwin = Tk_CanvasTkwin(canvas); if (Tk_ConfigureWidget(interp, tkwin, configSpecs, argc, argv, (char *) textPtr, flags) != TCL_OK) { return TCL_ERROR; } /* * A few of the options require additional processing, such as * graphics contexts. */ newGC = newSelGC = None; if ((textPtr->color != NULL) && (textPtr->tkfont != NULL)) { gcValues.foreground = textPtr->color->pixel; gcValues.font = Tk_FontId(textPtr->tkfont); mask = GCForeground|GCFont; if (textPtr->stipple != None) { gcValues.stipple = textPtr->stipple; gcValues.fill_style = FillStippled; mask |= GCForeground|GCStipple|GCFillStyle; } newGC = Tk_GetGC(tkwin, mask, &gcValues); gcValues.foreground = textInfoPtr->selFgColorPtr->pixel; newSelGC = Tk_GetGC(tkwin, mask, &gcValues); } if (textPtr->gc != None) { Tk_FreeGC(Tk_Display(tkwin), textPtr->gc); } textPtr->gc = newGC; if (textPtr->selTextGC != None) { Tk_FreeGC(Tk_Display(tkwin), textPtr->selTextGC); } textPtr->selTextGC = newSelGC; selBgColorPtr = Tk_3DBorderColor(textInfoPtr->selBorder); if (Tk_3DBorderColor(textInfoPtr->insertBorder)->pixel == selBgColorPtr->pixel) { if (selBgColorPtr->pixel == BlackPixelOfScreen(Tk_Screen(tkwin))) { gcValues.foreground = WhitePixelOfScreen(Tk_Screen(tkwin)); } else { gcValues.foreground = BlackPixelOfScreen(Tk_Screen(tkwin)); } newGC = Tk_GetGC(tkwin, GCForeground, &gcValues); } else { newGC = None; } if (textPtr->cursorOffGC != None) { Tk_FreeGC(Tk_Display(tkwin), textPtr->cursorOffGC); } textPtr->cursorOffGC = newGC; /* * If the text was changed, move the selection and insertion indices * to keep them inside the item. */ textPtr->numChars = strlen(textPtr->text); if (textInfoPtr->selItemPtr == itemPtr) { if (textInfoPtr->selectFirst >= textPtr->numChars) { textInfoPtr->selItemPtr = NULL; } else { if (textInfoPtr->selectLast >= textPtr->numChars) { textInfoPtr->selectLast = textPtr->numChars-1; } if ((textInfoPtr->anchorItemPtr == itemPtr) && (textInfoPtr->selectAnchor >= textPtr->numChars)) { textInfoPtr->selectAnchor = textPtr->numChars-1; } } } if (textPtr->insertPos >= textPtr->numChars) { textPtr->insertPos = textPtr->numChars; } ComputeTextBbox(canvas, textPtr); return TCL_OK; } /* *-------------------------------------------------------------- * * DeleteText -- * * This procedure is called to clean up the data structure * associated with a text item. * * Results: * None. * * Side effects: * Resources associated with itemPtr are released. * *-------------------------------------------------------------- */ static void DeleteText(canvas, itemPtr, display) Tk_Canvas canvas; /* Info about overall canvas widget. */ Tk_Item *itemPtr; /* Item that is being deleted. */ Display *display; /* Display containing window for * canvas. */ { TextItem *textPtr = (TextItem *) itemPtr; if (textPtr->color != NULL) { Tk_FreeColor(textPtr->color); } Tk_FreeFont(textPtr->tkfont); if (textPtr->stipple != None) { Tk_FreeBitmap(display, textPtr->stipple); } if (textPtr->text != NULL) { ckfree(textPtr->text); } Tk_FreeTextLayout(textPtr->textLayout); if (textPtr->gc != None) { Tk_FreeGC(display, textPtr->gc); } if (textPtr->selTextGC != None) { Tk_FreeGC(display, textPtr->selTextGC); } if (textPtr->cursorOffGC != None) { Tk_FreeGC(display, textPtr->cursorOffGC); } } /* *-------------------------------------------------------------- * * ComputeTextBbox -- * * This procedure is invoked to compute the bounding box of * all the pixels that may be drawn as part of a text item. * In addition, it recomputes all of the geometry information * used to display a text item or check for mouse hits. * * Results: * None. * * Side effects: * The fields x1, y1, x2, and y2 are updated in the header * for itemPtr, and the linePtr structure is regenerated * for itemPtr. * *-------------------------------------------------------------- */ static void ComputeTextBbox(canvas, textPtr) Tk_Canvas canvas; /* Canvas that contains item. */ TextItem *textPtr; /* Item whose bbos is to be * recomputed. */ { Tk_CanvasTextInfo *textInfoPtr; int leftX, topY, width, height, fudge; Tk_FreeTextLayout(textPtr->textLayout); textPtr->textLayout = Tk_ComputeTextLayout(textPtr->tkfont, textPtr->text, textPtr->numChars, textPtr->width, textPtr->justify, 0, &width, &height); /* * Use overall geometry information to compute the top-left corner * of the bounding box for the text item. */ leftX = (int) (textPtr->x + 0.5); topY = (int) (textPtr->y + 0.5); switch (textPtr->anchor) { case TK_ANCHOR_NW: case TK_ANCHOR_N: case TK_ANCHOR_NE: break; case TK_ANCHOR_W: case TK_ANCHOR_CENTER: case TK_ANCHOR_E: topY -= height / 2; break; case TK_ANCHOR_SW: case TK_ANCHOR_S: case TK_ANCHOR_SE: topY -= height; break; } switch (textPtr->anchor) { case TK_ANCHOR_NW: case TK_ANCHOR_W: case TK_ANCHOR_SW: break; case TK_ANCHOR_N: case TK_ANCHOR_CENTER: case TK_ANCHOR_S: leftX -= width / 2; break; case TK_ANCHOR_NE: case TK_ANCHOR_E: case TK_ANCHOR_SE: leftX -= width; break; } textPtr->leftEdge = leftX; textPtr->rightEdge = leftX + width; /* * Last of all, update the bounding box for the item. The item's * bounding box includes the bounding box of all its lines, plus * an extra fudge factor for the cursor border (which could * potentially be quite large). */ textInfoPtr = textPtr->textInfoPtr; fudge = (textInfoPtr->insertWidth + 1) / 2; if (textInfoPtr->selBorderWidth > fudge) { fudge = textInfoPtr->selBorderWidth; } textPtr->header.x1 = leftX - fudge; textPtr->header.y1 = topY; textPtr->header.x2 = leftX + width + fudge; textPtr->header.y2 = topY + height; } /* *-------------------------------------------------------------- * * DisplayCanvText -- * * This procedure is invoked to draw a text item in a given * drawable. * * Results: * None. * * Side effects: * ItemPtr is drawn in drawable using the transformation * information in canvas. * *-------------------------------------------------------------- */ static void DisplayCanvText(canvas, itemPtr, display, drawable, x, y, width, height) Tk_Canvas canvas; /* Canvas that contains item. */ Tk_Item *itemPtr; /* Item to be displayed. */ Display *display; /* Display on which to draw item. */ Drawable drawable; /* Pixmap or window in which to draw * item. */ int x, y, width, height; /* Describes region of canvas that * must be redisplayed (not used). */ { TextItem *textPtr; Tk_CanvasTextInfo *textInfoPtr; int selFirst, selLast; short drawableX, drawableY; textPtr = (TextItem *) itemPtr; textInfoPtr = textPtr->textInfoPtr; if (textPtr->gc == None) { return; } /* * If we're stippling, then modify the stipple offset in the GC. Be * sure to reset the offset when done, since the GC is supposed to be * read-only. */ if (textPtr->stipple != None) { Tk_CanvasSetStippleOrigin(canvas, textPtr->gc); } selFirst = -1; selLast = 0; /* lint. */ if (textInfoPtr->selItemPtr == itemPtr) { selFirst = textInfoPtr->selectFirst; selLast = textInfoPtr->selectLast; if (selLast >= textPtr->numChars) { selLast = textPtr->numChars - 1; } if ((selFirst >= 0) && (selFirst <= selLast)) { /* * Draw a special background under the selection. */ int xFirst, yFirst, hFirst; int xLast, yLast, wLast; Tk_CharBbox(textPtr->textLayout, selFirst, &xFirst, &yFirst, NULL, &hFirst); Tk_CharBbox(textPtr->textLayout, selLast, &xLast, &yLast, &wLast, NULL); /* * If the selection spans the end of this line, then display * selection background all the way to the end of the line. * However, for the last line we only want to display up to the * last character, not the end of the line. */ x = xFirst; height = hFirst; for (y = yFirst ; y <= yLast; y += height) { if (y == yLast) { width = (xLast + wLast) - x; } else { width = textPtr->rightEdge - textPtr->leftEdge - x; } Tk_CanvasDrawableCoords(canvas, (double) (textPtr->leftEdge + x - textInfoPtr->selBorderWidth), (double) (textPtr->header.y1 + y), &drawableX, &drawableY); Tk_Fill3DRectangle(Tk_CanvasTkwin(canvas), drawable, textInfoPtr->selBorder, drawableX, drawableY, width + 2 * textInfoPtr->selBorderWidth, height, textInfoPtr->selBorderWidth, TK_RELIEF_RAISED); x = 0; } } } /* * If the insertion point should be displayed, then draw a special * background for the cursor before drawing the text. Note: if * we're the cursor item but the cursor is turned off, then redraw * background over the area of the cursor. This guarantees that * the selection won't make the cursor invisible on mono displays, * where both are drawn in the same color. */ if ((textInfoPtr->focusItemPtr == itemPtr) && (textInfoPtr->gotFocus)) { if (Tk_CharBbox(textPtr->textLayout, textPtr->insertPos, &x, &y, NULL, &height)) { Tk_CanvasDrawableCoords(canvas, (double) (textPtr->leftEdge + x - (textInfoPtr->insertWidth / 2)), (double) (textPtr->header.y1 + y), &drawableX, &drawableY); if (textInfoPtr->cursorOn) { Tk_Fill3DRectangle(Tk_CanvasTkwin(canvas), drawable, textInfoPtr->insertBorder, drawableX, drawableY, textInfoPtr->insertWidth, height, textInfoPtr->insertBorderWidth, TK_RELIEF_RAISED); } else if (textPtr->cursorOffGC != None) { /* * Redraw the background over the area of the cursor, * even though the cursor is turned off. This * guarantees that the selection won't make the cursor * invisible on mono displays, where both may be drawn * in the same color. */ XFillRectangle(display, drawable, textPtr->cursorOffGC, drawableX, drawableY, (unsigned) textInfoPtr->insertWidth, (unsigned) height); } } } /* * Display the text in two pieces: draw the entire text item, then * draw the selected text on top of it. The selected text then * will only need to be drawn if it has different attributes (such * as foreground color) than regular text. */ Tk_CanvasDrawableCoords(canvas, (double) textPtr->leftEdge, (double) textPtr->header.y1, &drawableX, &drawableY); Tk_DrawTextLayout(display, drawable, textPtr->gc, textPtr->textLayout, drawableX, drawableY, 0, -1); if ((selFirst >= 0) && (textPtr->selTextGC != textPtr->gc)) { Tk_DrawTextLayout(display, drawable, textPtr->selTextGC, textPtr->textLayout, drawableX, drawableY, selFirst, selLast + 1); } if (textPtr->stipple != None) { XSetTSOrigin(display, textPtr->gc, 0, 0); } } /* *-------------------------------------------------------------- * * TextInsert -- * * Insert characters into a text item at a given position. * * Results: * None. * * Side effects: * The text in the given item is modified. The cursor and * selection positions are also modified to reflect the * insertion. * *-------------------------------------------------------------- */ static void TextInsert(canvas, itemPtr, beforeThis, string) Tk_Canvas canvas; /* Canvas containing text item. */ Tk_Item *itemPtr; /* Text item to be modified. */ int beforeThis; /* Index of character before which text is * to be inserted. */ char *string; /* New characters to be inserted. */ { TextItem *textPtr = (TextItem *) itemPtr; int length; char *new; Tk_CanvasTextInfo *textInfoPtr = textPtr->textInfoPtr; length = strlen(string); if (length == 0) { return; } if (beforeThis < 0) { beforeThis = 0; } if (beforeThis > textPtr->numChars) { beforeThis = textPtr->numChars; } new = (char *) ckalloc((unsigned) (textPtr->numChars + length + 1)); strncpy(new, textPtr->text, (size_t) beforeThis); strcpy(new+beforeThis, string); strcpy(new+beforeThis+length, textPtr->text+beforeThis); ckfree(textPtr->text); textPtr->text = new; textPtr->numChars += length; /* * Inserting characters invalidates indices such as those for the * selection and cursor. Update the indices appropriately. */ if (textInfoPtr->selItemPtr == itemPtr) { if (textInfoPtr->selectFirst >= beforeThis) { textInfoPtr->selectFirst += length; } if (textInfoPtr->selectLast >= beforeThis) { textInfoPtr->selectLast += length; } if ((textInfoPtr->anchorItemPtr == itemPtr) && (textInfoPtr->selectAnchor >= beforeThis)) { textInfoPtr->selectAnchor += length; } } if (textPtr->insertPos >= beforeThis) { textPtr->insertPos += length; } ComputeTextBbox(canvas, textPtr); } /* *-------------------------------------------------------------- * * TextDeleteChars -- * * Delete one or more characters from a text item. * * Results: * None. * * Side effects: * Characters between "first" and "last", inclusive, get * deleted from itemPtr, and things like the selection * position get updated. * *-------------------------------------------------------------- */ static void TextDeleteChars(canvas, itemPtr, first, last) Tk_Canvas canvas; /* Canvas containing itemPtr. */ Tk_Item *itemPtr; /* Item in which to delete characters. */ int first; /* Index of first character to delete. */ int last; /* Index of last character to delete. */ { TextItem *textPtr = (TextItem *) itemPtr; int count; char *new; Tk_CanvasTextInfo *textInfoPtr = textPtr->textInfoPtr; if (first < 0) { first = 0; } if (last >= textPtr->numChars) { last = textPtr->numChars-1; } if (first > last) { return; } count = last + 1 - first; new = (char *) ckalloc((unsigned) (textPtr->numChars + 1 - count)); strncpy(new, textPtr->text, (size_t) first); strcpy(new+first, textPtr->text+last+1); ckfree(textPtr->text); textPtr->text = new; textPtr->numChars -= count; /* * Update indexes for the selection and cursor to reflect the * renumbering of the remaining characters. */ if (textInfoPtr->selItemPtr == itemPtr) { if (textInfoPtr->selectFirst > first) { textInfoPtr->selectFirst -= count; if (textInfoPtr->selectFirst < first) { textInfoPtr->selectFirst = first; } } if (textInfoPtr->selectLast >= first) { textInfoPtr->selectLast -= count; if (textInfoPtr->selectLast < (first-1)) { textInfoPtr->selectLast = (first-1); } } if (textInfoPtr->selectFirst > textInfoPtr->selectLast) { textInfoPtr->selItemPtr = NULL; } if ((textInfoPtr->anchorItemPtr == itemPtr) && (textInfoPtr->selectAnchor > first)) { textInfoPtr->selectAnchor -= count; if (textInfoPtr->selectAnchor < first) { textInfoPtr->selectAnchor = first; } } } if (textPtr->insertPos > first) { textPtr->insertPos -= count; if (textPtr->insertPos < first) { textPtr->insertPos = first; } } ComputeTextBbox(canvas, textPtr); return; } /* *-------------------------------------------------------------- * * TextToPoint -- * * Computes the distance from a given point to a given * text item, in canvas units. * * Results: * The return value is 0 if the point whose x and y coordinates * are pointPtr[0] and pointPtr[1] is inside the text item. If * the point isn't inside the text item then the return value * is the distance from the point to the text item. * * Side effects: * None. * *-------------------------------------------------------------- */ static double TextToPoint(canvas, itemPtr, pointPtr) Tk_Canvas canvas; /* Canvas containing itemPtr. */ Tk_Item *itemPtr; /* Item to check against point. */ double *pointPtr; /* Pointer to x and y coordinates. */ { TextItem *textPtr; textPtr = (TextItem *) itemPtr; return (double) Tk_DistanceToTextLayout(textPtr->textLayout, (int) pointPtr[0] - textPtr->leftEdge, (int) pointPtr[1] - textPtr->header.y1); } /* *-------------------------------------------------------------- * * TextToArea -- * * This procedure is called to determine whether an item * lies entirely inside, entirely outside, or overlapping * a given rectangle. * * Results: * -1 is returned if the item is entirely outside the area * given by rectPtr, 0 if it overlaps, and 1 if it is entirely * inside the given area. * * Side effects: * None. * *-------------------------------------------------------------- */ static int TextToArea(canvas, itemPtr, rectPtr) Tk_Canvas canvas; /* Canvas containing itemPtr. */ Tk_Item *itemPtr; /* Item to check against rectangle. */ double *rectPtr; /* Pointer to array of four coordinates * (x1, y1, x2, y2) describing rectangular * area. */ { TextItem *textPtr; textPtr = (TextItem *) itemPtr; return Tk_IntersectTextLayout(textPtr->textLayout, (int) (rectPtr[0] + 0.5) - textPtr->leftEdge, (int) (rectPtr[1] + 0.5) - textPtr->header.y1, (int) (rectPtr[2] - rectPtr[0] + 0.5), (int) (rectPtr[3] - rectPtr[1] + 0.5)); } /* *-------------------------------------------------------------- * * ScaleText -- * * This procedure is invoked to rescale a text item. * * Results: * None. * * Side effects: * Scales the position of the text, but not the size * of the font for the text. * *-------------------------------------------------------------- */ /* ARGSUSED */ static void ScaleText(canvas, itemPtr, originX, originY, scaleX, scaleY) Tk_Canvas canvas; /* Canvas containing rectangle. */ Tk_Item *itemPtr; /* Rectangle to be scaled. */ double originX, originY; /* Origin about which to scale rect. */ double scaleX; /* Amount to scale in X direction. */ double scaleY; /* Amount to scale in Y direction. */ { TextItem *textPtr = (TextItem *) itemPtr; textPtr->x = originX + scaleX*(textPtr->x - originX); textPtr->y = originY + scaleY*(textPtr->y - originY); ComputeTextBbox(canvas, textPtr); return; } /* *-------------------------------------------------------------- * * TranslateText -- * * This procedure is called to move a text item by a * given amount. * * Results: * None. * * Side effects: * The position of the text item is offset by (xDelta, yDelta), * and the bounding box is updated in the generic part of the * item structure. * *-------------------------------------------------------------- */ static void TranslateText(canvas, itemPtr, deltaX, deltaY) Tk_Canvas canvas; /* Canvas containing item. */ Tk_Item *itemPtr; /* Item that is being moved. */ double deltaX, deltaY; /* Amount by which item is to be * moved. */ { TextItem *textPtr = (TextItem *) itemPtr; textPtr->x += deltaX; textPtr->y += deltaY; ComputeTextBbox(canvas, textPtr); } /* *-------------------------------------------------------------- * * GetTextIndex -- * * Parse an index into a text item and return either its value * or an error. * * Results: * A standard Tcl result. If all went well, then *indexPtr is * filled in with the index (into itemPtr) corresponding to * string. Otherwise an error message is left in * interp->result. * * Side effects: * None. * *-------------------------------------------------------------- */ static int GetTextIndex(interp, canvas, itemPtr, string, indexPtr) Tcl_Interp *interp; /* Used for error reporting. */ Tk_Canvas canvas; /* Canvas containing item. */ Tk_Item *itemPtr; /* Item for which the index is being * specified. */ char *string; /* Specification of a particular character * in itemPtr's text. */ int *indexPtr; /* Where to store converted index. */ { TextItem *textPtr = (TextItem *) itemPtr; size_t length; int c; TkCanvas *canvasPtr = (TkCanvas *) canvas; Tk_CanvasTextInfo *textInfoPtr = textPtr->textInfoPtr; c = string[0]; length = strlen(string); if ((c == 'e') && (strncmp(string, "end", length) == 0)) { *indexPtr = textPtr->numChars; } else if ((c == 'i') && (strncmp(string, "insert", length) == 0)) { *indexPtr = textPtr->insertPos; } else if ((c == 's') && (strncmp(string, "sel.first", length) == 0) && (length >= 5)) { if (textInfoPtr->selItemPtr != itemPtr) { interp->result = "selection isn't in item"; return TCL_ERROR; } *indexPtr = textInfoPtr->selectFirst; } else if ((c == 's') && (strncmp(string, "sel.last", length) == 0) && (length >= 5)) { if (textInfoPtr->selItemPtr != itemPtr) { interp->result = "selection isn't in item"; return TCL_ERROR; } *indexPtr = textInfoPtr->selectLast; } else if (c == '@') { int x, y; double tmp; char *end, *p; p = string+1; tmp = strtod(p, &end); if ((end == p) || (*end != ',')) { goto badIndex; } x = (int) ((tmp < 0) ? tmp - 0.5 : tmp + 0.5); p = end+1; tmp = strtod(p, &end); if ((end == p) || (*end != 0)) { goto badIndex; } y = (int) ((tmp < 0) ? tmp - 0.5 : tmp + 0.5); *indexPtr = Tk_PointToChar(textPtr->textLayout, x + canvasPtr->scrollX1 - textPtr->leftEdge, y + canvasPtr->scrollY1 - textPtr->header.y1); } else if (Tcl_GetInt(interp, string, indexPtr) == TCL_OK) { if (*indexPtr < 0){ *indexPtr = 0; } else if (*indexPtr > textPtr->numChars) { *indexPtr = textPtr->numChars; } } else { /* * Some of the paths here leave messages in interp->result, * so we have to clear it out before storing our own message. */ badIndex: Tcl_SetResult(interp, (char *) NULL, TCL_STATIC); Tcl_AppendResult(interp, "bad index \"", string, "\"", (char *) NULL); return TCL_ERROR; } return TCL_OK; } /* *-------------------------------------------------------------- * * SetTextCursor -- * * Set the position of the insertion cursor in this item. * * Results: * None. * * Side effects: * The cursor position will change. * *-------------------------------------------------------------- */ /* ARGSUSED */ static void SetTextCursor(canvas, itemPtr, index) Tk_Canvas canvas; /* Record describing canvas widget. */ Tk_Item *itemPtr; /* Text item in which cursor position * is to be set. */ int index; /* Index of character just before which * cursor is to be positioned. */ { TextItem *textPtr = (TextItem *) itemPtr; if (index < 0) { textPtr->insertPos = 0; } else if (index > textPtr->numChars) { textPtr->insertPos = textPtr->numChars; } else { textPtr->insertPos = index; } } /* *-------------------------------------------------------------- * * GetSelText -- * * This procedure is invoked to return the selected portion * of a text item. It is only called when this item has * the selection. * * Results: * The return value is the number of non-NULL bytes stored * at buffer. Buffer is filled (or partially filled) with a * NULL-terminated string containing part or all of the selection, * as given by offset and maxBytes. * * Side effects: * None. * *-------------------------------------------------------------- */ static int GetSelText(canvas, itemPtr, offset, buffer, maxBytes) Tk_Canvas canvas; /* Canvas containing selection. */ Tk_Item *itemPtr; /* Text item containing selection. */ int offset; /* Offset within selection of first * character to be returned. */ char *buffer; /* Location in which to place * selection. */ int maxBytes; /* Maximum number of bytes to place * at buffer, not including terminating * NULL character. */ { TextItem *textPtr = (TextItem *) itemPtr; int count; Tk_CanvasTextInfo *textInfoPtr = textPtr->textInfoPtr; count = textInfoPtr->selectLast + 1 - textInfoPtr->selectFirst - offset; if (textInfoPtr->selectLast == textPtr->numChars) { count -= 1; } if (count > maxBytes) { count = maxBytes; } if (count <= 0) { return 0; } strncpy(buffer, textPtr->text + textInfoPtr->selectFirst + offset, (size_t) count); buffer[count] = '\0'; return count; } /* *-------------------------------------------------------------- * * TextToPostscript -- * * This procedure is called to generate Postscript for * text items. * * Results: * The return value is a standard Tcl result. If an error * occurs in generating Postscript then an error message is * left in interp->result, replacing whatever used * to be there. If no error occurs, then Postscript for the * item is appended to the result. * * Side effects: * None. * *-------------------------------------------------------------- */ static int TextToPostscript(interp, canvas, itemPtr, prepass) Tcl_Interp *interp; /* Leave Postscript or error message * here. */ Tk_Canvas canvas; /* Information about overall canvas. */ Tk_Item *itemPtr; /* Item for which Postscript is * wanted. */ int prepass; /* 1 means this is a prepass to * collect font information; 0 means * final Postscript is being created. */ { TextItem *textPtr = (TextItem *) itemPtr; int x, y; Tk_FontMetrics fm; char *justify; char buffer[500]; if (textPtr->color == NULL) { return TCL_OK; } if (Tk_CanvasPsFont(interp, canvas, textPtr->tkfont) != TCL_OK) { return TCL_ERROR; } if (prepass != 0) { return TCL_OK; } if (Tk_CanvasPsColor(interp, canvas, textPtr->color) != TCL_OK) { return TCL_ERROR; } if (textPtr->stipple != None) { Tcl_AppendResult(interp, "/StippleText {\n ", (char *) NULL); Tk_CanvasPsStipple(interp, canvas, textPtr->stipple); Tcl_AppendResult(interp, "} bind def\n", (char *) NULL); } sprintf(buffer, "%.15g %.15g [\n", textPtr->x, Tk_CanvasPsY(canvas, textPtr->y)); Tcl_AppendResult(interp, buffer, (char *) NULL); Tk_TextLayoutToPostscript(interp, textPtr->textLayout); x = 0; y = 0; justify = NULL; /* lint. */ switch (textPtr->anchor) { case TK_ANCHOR_NW: x = 0; y = 0; break; case TK_ANCHOR_N: x = 1; y = 0; break; case TK_ANCHOR_NE: x = 2; y = 0; break; case TK_ANCHOR_E: x = 2; y = 1; break; case TK_ANCHOR_SE: x = 2; y = 2; break; case TK_ANCHOR_S: x = 1; y = 2; break; case TK_ANCHOR_SW: x = 0; y = 2; break; case TK_ANCHOR_W: x = 0; y = 1; break; case TK_ANCHOR_CENTER: x = 1; y = 1; break; } switch (textPtr->justify) { case TK_JUSTIFY_LEFT: justify = "0"; break; case TK_JUSTIFY_CENTER: justify = "0.5";break; case TK_JUSTIFY_RIGHT: justify = "1"; break; } Tk_GetFontMetrics(textPtr->tkfont, &fm); sprintf(buffer, "] %d %g %g %s %s DrawText\n", fm.linespace, x / -2.0, y / 2.0, justify, ((textPtr->stipple == None) ? "false" : "true")); Tcl_AppendResult(interp, buffer, (char *) NULL); return TCL_OK; }