1556 lines
46 KiB
C
1556 lines
46 KiB
C
/*
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* tkCanvText.c --
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*
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* This file implements text items for canvas widgets.
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*
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* Copyright (c) 1991-1993 The Regents of the University of California.
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* All rights reserved.
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*
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* Permission is hereby granted, without written agreement and without
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* license or royalty fees, to use, copy, modify, and distribute this
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* software and its documentation for any purpose, provided that the
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* above copyright notice and the following two paragraphs appear in
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* all copies of this software.
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*
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* IN NO EVENT SHALL THE UNIVERSITY OF CALIFORNIA BE LIABLE TO ANY PARTY FOR
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* DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES ARISING OUT
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* OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF THE UNIVERSITY OF
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* CALIFORNIA HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* THE UNIVERSITY OF CALIFORNIA SPECIFICALLY DISCLAIMS ANY WARRANTIES,
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* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
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* AND FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
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* ON AN "AS IS" BASIS, AND THE UNIVERSITY OF CALIFORNIA HAS NO OBLIGATION TO
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* PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
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*/
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#ifndef lint
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static char rcsid[] = "$Header: /user6/ouster/wish/RCS/tkCanvText.c,v 1.28 93/08/18 16:25:27 ouster Exp $ SPRITE (Berkeley)";
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#endif
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#include <stdio.h>
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#include "tkInt.h"
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#include "tkCanvas.h"
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#include "tkConfig.h"
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/*
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* One of the following structures is kept for each line of text
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* in a text item. It contains geometry and display information
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* for that line.
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*/
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typedef struct TextLine {
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char *firstChar; /* Pointer to the first character in this
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* line (in the "text" field of enclosing
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* text item). */
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int numChars; /* Number of characters displayed in this
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* line. */
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int totalChars; /* Total number of characters included as
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* part of this line (may include an extra
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* space character at the end that isn't
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* displayed). */
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int x, y; /* Origin at which to draw line on screen
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* (in integer pixel units, but in canvas
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* coordinates, not screen coordinates). */
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int x1, y1; /* Upper-left pixel that is part of text
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* line on screen (again, in integer canvas
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* pixel units). */
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int x2, y2; /* Lower-left pixel that is part of text
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* line on screen (again, in integer canvas
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* pixel units). */
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} TextLine;
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/*
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* The structure below defines the record for each text item.
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*/
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typedef struct TextItem {
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Tk_Item header; /* Generic stuff that's the same for all
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* types. MUST BE FIRST IN STRUCTURE. */
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char *text; /* Text for item (malloc-ed). */
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int numChars; /* Number of non-NULL characters in text. */
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double x, y; /* Positioning point for text. */
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Tk_Anchor anchor; /* Where to anchor text relative to (x,y). */
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int width; /* Width of lines for word-wrap, pixels.
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* Zero means no word-wrap. */
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Tk_Justify justify; /* Justification mode for text. */
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int rightEdge; /* Pixel just to right of right edge of
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* area of text item. Used for selecting
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* up to end of line. */
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XFontStruct *fontPtr; /* Font for drawing text. */
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XColor *color; /* Color for text. */
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Pixmap stipple; /* Stipple bitmap for text, or None. */
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GC gc; /* Graphics context for drawing text. */
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TextLine *linePtr; /* Pointer to array of structures describing
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* individual lines of text item (malloc-ed). */
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int numLines; /* Number of structs at *linePtr. */
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int insertPos; /* Insertion cursor is displayed just to left
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* of character with this index. */
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GC selTextGC; /* Graphics context for selected text. */
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} TextItem;
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/*
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* Information used for parsing configuration specs:
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*/
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static Tk_ConfigSpec configSpecs[] = {
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{TK_CONFIG_ANCHOR, "-anchor", (char *) NULL, (char *) NULL,
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"center", Tk_Offset(TextItem, anchor),
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TK_CONFIG_DONT_SET_DEFAULT},
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{TK_CONFIG_COLOR, "-fill", (char *) NULL, (char *) NULL,
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"black", Tk_Offset(TextItem, color), 0},
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{TK_CONFIG_FONT, "-font", (char *) NULL, (char *) NULL,
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"-Adobe-Helvetica-Bold-R-Normal--*-120-*",
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Tk_Offset(TextItem, fontPtr), 0},
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{TK_CONFIG_JUSTIFY, "-justify", (char *) NULL, (char *) NULL,
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"left", Tk_Offset(TextItem, justify),
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TK_CONFIG_DONT_SET_DEFAULT},
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{TK_CONFIG_BITMAP, "-stipple", (char *) NULL, (char *) NULL,
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(char *) NULL, Tk_Offset(TextItem, stipple), TK_CONFIG_NULL_OK},
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{TK_CONFIG_CUSTOM, "-tags", (char *) NULL, (char *) NULL,
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(char *) NULL, 0, TK_CONFIG_NULL_OK, &tkCanvasTagsOption},
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{TK_CONFIG_STRING, "-text", (char *) NULL, (char *) NULL,
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"", Tk_Offset(TextItem, text), 0},
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{TK_CONFIG_PIXELS, "-width", (char *) NULL, (char *) NULL,
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"0", Tk_Offset(TextItem, width), TK_CONFIG_DONT_SET_DEFAULT},
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{TK_CONFIG_END, (char *) NULL, (char *) NULL, (char *) NULL,
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(char *) NULL, 0, 0}
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};
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/*
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* Prototypes for procedures defined in this file:
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*/
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static void ComputeTextBbox _ANSI_ARGS_((Tk_Canvas *canvasPtr,
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TextItem *textPtr));
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static int ConfigureText _ANSI_ARGS_((
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Tk_Canvas *canvasPtr, Tk_Item *itemPtr, int argc,
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char **argv, int flags));
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static int CreateText _ANSI_ARGS_((Tk_Canvas *canvasPtr,
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struct Tk_Item *itemPtr, int argc, char **argv));
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static void DeleteText _ANSI_ARGS_((Tk_Canvas *canvasPtr,
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Tk_Item *itemPtr));
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static void DisplayText _ANSI_ARGS_((Tk_Canvas *canvasPtr,
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Tk_Item *itemPtr, Drawable dst));
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static int GetSelText _ANSI_ARGS_((Tk_Canvas *canvasPtr,
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Tk_Item *itemPtr, int offset, char *buffer,
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int maxBytes));
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static int GetTextIndex _ANSI_ARGS_((Tk_Canvas *canvasPtr,
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Tk_Item *itemPtr, char *indexString,
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int *indexPtr));
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static void LineToPostscript _ANSI_ARGS_((Tcl_Interp *interp,
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char *string, int numChars));
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static void ScaleText _ANSI_ARGS_((Tk_Canvas *canvasPtr,
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Tk_Item *itemPtr, double originX, double originY,
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double scaleX, double scaleY));
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static void SetTextCursor _ANSI_ARGS_((Tk_Canvas *canvasPtr,
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Tk_Item *itemPtr, int index));
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static int TextCoords _ANSI_ARGS_((Tk_Canvas *canvasPtr,
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Tk_Item *itemPtr, int argc, char **argv));
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static int TextDeleteChars _ANSI_ARGS_((Tk_Canvas *canvasPtr,
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Tk_Item *itemPtr, int first, int last));
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static int TextInsert _ANSI_ARGS_((Tk_Canvas *canvasPtr,
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Tk_Item *itemPtr, int beforeThis, char *string));
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static int TextToArea _ANSI_ARGS_((Tk_Canvas *canvasPtr,
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Tk_Item *itemPtr, double *rectPtr));
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static double TextToPoint _ANSI_ARGS_((Tk_Canvas *canvasPtr,
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Tk_Item *itemPtr, double *pointPtr));
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static int TextToPostscript _ANSI_ARGS_((Tk_Canvas *canvasPtr,
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Tk_Item *itemPtr, Tk_PostscriptInfo *psInfoPtr));
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static void TranslateText _ANSI_ARGS_((Tk_Canvas *canvasPtr,
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Tk_Item *itemPtr, double deltaX, double deltaY));
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/*
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* The structures below defines the rectangle and oval item types
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* by means of procedures that can be invoked by generic item code.
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*/
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Tk_ItemType TkTextType = {
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"text", /* name */
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sizeof(TextItem), /* itemSize */
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CreateText, /* createProc */
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configSpecs, /* configSpecs */
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ConfigureText, /* configureProc */
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TextCoords, /* coordProc */
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DeleteText, /* deleteProc */
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DisplayText, /* displayProc */
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0, /* alwaysRedraw */
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TextToPoint, /* pointProc */
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TextToArea, /* areaProc */
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TextToPostscript, /* postscriptProc */
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ScaleText, /* scaleProc */
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TranslateText, /* translateProc */
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GetTextIndex, /* indexProc */
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SetTextCursor, /* icursorProc */
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GetSelText, /* selectionProc */
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TextInsert, /* insertProc */
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TextDeleteChars, /* dTextProc */
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(Tk_ItemType *) NULL /* nextPtr */
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};
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/*
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*--------------------------------------------------------------
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*
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* CreateText --
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*
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* This procedure is invoked to create a new text item
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* in a canvas.
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*
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* Results:
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* A standard Tcl return value. If an error occurred in
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* creating the item then an error message is left in
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* canvasPtr->interp->result; in this case itemPtr is
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* left uninitialized so it can be safely freed by the
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* caller.
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*
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* Side effects:
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* A new text item is created.
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*
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*--------------------------------------------------------------
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*/
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static int
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CreateText(canvasPtr, itemPtr, argc, argv)
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register Tk_Canvas *canvasPtr; /* Canvas to hold new item. */
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Tk_Item *itemPtr; /* Record to hold new item; header
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* has been initialized by caller. */
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int argc; /* Number of arguments in argv. */
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char **argv; /* Arguments describing rectangle. */
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{
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register TextItem *textPtr = (TextItem *) itemPtr;
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if (argc < 2) {
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Tcl_AppendResult(canvasPtr->interp, "wrong # args: should be \"",
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Tk_PathName(canvasPtr->tkwin), "\" create ",
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itemPtr->typePtr->name, " x y [options]", (char *) NULL);
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return TCL_ERROR;
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}
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/*
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* Carry out initialization that is needed in order to clean
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* up after errors during the the remainder of this procedure.
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*/
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textPtr->text = NULL;
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textPtr->numChars = 0;
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textPtr->anchor = TK_ANCHOR_CENTER;
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textPtr->width = 0;
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textPtr->justify = TK_JUSTIFY_LEFT;
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textPtr->rightEdge = 0;
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textPtr->fontPtr = NULL;
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textPtr->color = NULL;
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textPtr->stipple = None;
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textPtr->gc = None;
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textPtr->linePtr = NULL;
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textPtr->numLines = 0;
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textPtr->insertPos = 0;
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textPtr->selTextGC = None;
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/*
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* Process the arguments to fill in the item record.
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*/
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if ((TkGetCanvasCoord(canvasPtr, argv[0], &textPtr->x) != TCL_OK)
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|| (TkGetCanvasCoord(canvasPtr, argv[1], &textPtr->y) != TCL_OK)) {
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return TCL_ERROR;
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}
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if (ConfigureText(canvasPtr, itemPtr, argc-2, argv+2, 0) != TCL_OK) {
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DeleteText(canvasPtr, itemPtr);
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return TCL_ERROR;
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}
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return TCL_OK;
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}
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/*
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*--------------------------------------------------------------
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*
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* TextCoords --
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*
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* This procedure is invoked to process the "coords" widget
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* command on text items. See the user documentation for
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* details on what it does.
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*
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* Results:
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* Returns TCL_OK or TCL_ERROR, and sets canvasPtr->interp->result.
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*
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* Side effects:
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* The coordinates for the given item may be changed.
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*
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*--------------------------------------------------------------
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*/
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static int
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TextCoords(canvasPtr, itemPtr, argc, argv)
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register Tk_Canvas *canvasPtr; /* Canvas containing item. */
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Tk_Item *itemPtr; /* Item whose coordinates are to be
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* read or modified. */
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int argc; /* Number of coordinates supplied in
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* argv. */
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char **argv; /* Array of coordinates: x1, y1,
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* x2, y2, ... */
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{
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register TextItem *textPtr = (TextItem *) itemPtr;
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char x[TCL_DOUBLE_SPACE], y[TCL_DOUBLE_SPACE];
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if (argc == 0) {
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Tcl_PrintDouble(canvasPtr->interp, textPtr->x, x);
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Tcl_PrintDouble(canvasPtr->interp, textPtr->y, y);
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Tcl_AppendResult(canvasPtr->interp, x, " ", y, (char *) NULL);
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} else if (argc == 2) {
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if ((TkGetCanvasCoord(canvasPtr, argv[0], &textPtr->x) != TCL_OK)
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|| (TkGetCanvasCoord(canvasPtr, argv[1],
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&textPtr->y) != TCL_OK)) {
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return TCL_ERROR;
|
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}
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ComputeTextBbox(canvasPtr, textPtr);
|
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} else {
|
||
sprintf(canvasPtr->interp->result,
|
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"wrong # coordinates: expected 0 or 2, got %d",
|
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argc);
|
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return TCL_ERROR;
|
||
}
|
||
return TCL_OK;
|
||
}
|
||
|
||
/*
|
||
*--------------------------------------------------------------
|
||
*
|
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* ConfigureText --
|
||
*
|
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* This procedure is invoked to configure various aspects
|
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* 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 canvasPtr->interp->result.
|
||
*
|
||
* Side effects:
|
||
* Configuration information, such as colors and stipple
|
||
* patterns, may be set for itemPtr.
|
||
*
|
||
*--------------------------------------------------------------
|
||
*/
|
||
|
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static int
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ConfigureText(canvasPtr, itemPtr, argc, argv, flags)
|
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Tk_Canvas *canvasPtr; /* Canvas containing itemPtr. */
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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. */
|
||
{
|
||
register TextItem *textPtr = (TextItem *) itemPtr;
|
||
XGCValues gcValues;
|
||
GC newGC, newSelGC;
|
||
unsigned long mask;
|
||
|
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if (Tk_ConfigureWidget(canvasPtr->interp, canvasPtr->tkwin,
|
||
configSpecs, argc, argv, (char *) textPtr, flags) != TCL_OK) {
|
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return TCL_ERROR;
|
||
}
|
||
|
||
/*
|
||
* A few of the options require additional processing, such as
|
||
* graphics contexts.
|
||
*/
|
||
|
||
textPtr->numChars = strlen(textPtr->text);
|
||
newGC = newSelGC = None;
|
||
if ((textPtr->color != NULL) && (textPtr->fontPtr != NULL)) {
|
||
gcValues.foreground = textPtr->color->pixel;
|
||
gcValues.font = textPtr->fontPtr->fid;
|
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mask = GCForeground|GCFont;
|
||
if (textPtr->stipple != None) {
|
||
gcValues.stipple = textPtr->stipple;
|
||
gcValues.fill_style = FillStippled;
|
||
mask |= GCForeground|GCStipple|GCFillStyle;
|
||
}
|
||
newGC = Tk_GetGC(canvasPtr->tkwin, mask, &gcValues);
|
||
gcValues.foreground = canvasPtr->selFgColorPtr->pixel;
|
||
newSelGC = Tk_GetGC(canvasPtr->tkwin, mask, &gcValues);
|
||
}
|
||
if (textPtr->gc != None) {
|
||
Tk_FreeGC(canvasPtr->display, textPtr->gc);
|
||
}
|
||
textPtr->gc = newGC;
|
||
if (textPtr->selTextGC != None) {
|
||
Tk_FreeGC(canvasPtr->display, textPtr->selTextGC);
|
||
}
|
||
textPtr->selTextGC = newSelGC;
|
||
|
||
/*
|
||
* If the text was changed, move the selection and insertion indices
|
||
* to keep them inside the item.
|
||
*/
|
||
|
||
if (canvasPtr->selItemPtr == itemPtr) {
|
||
if (canvasPtr->selectFirst >= textPtr->numChars) {
|
||
canvasPtr->selItemPtr = NULL;
|
||
} else {
|
||
if (canvasPtr->selectLast >= textPtr->numChars) {
|
||
canvasPtr->selectLast = textPtr->numChars-1;
|
||
}
|
||
if ((canvasPtr->anchorItemPtr == itemPtr)
|
||
&& (canvasPtr->selectAnchor >= textPtr->numChars)) {
|
||
canvasPtr->selectAnchor = textPtr->numChars-1;
|
||
}
|
||
}
|
||
}
|
||
if (textPtr->insertPos >= textPtr->numChars) {
|
||
textPtr->insertPos = textPtr->numChars;
|
||
}
|
||
|
||
ComputeTextBbox(canvasPtr, 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(canvasPtr, itemPtr)
|
||
Tk_Canvas *canvasPtr; /* Info about overall canvas widget. */
|
||
Tk_Item *itemPtr; /* Item that is being deleted. */
|
||
{
|
||
register TextItem *textPtr = (TextItem *) itemPtr;
|
||
|
||
if (textPtr->text != NULL) {
|
||
ckfree(textPtr->text);
|
||
}
|
||
if (textPtr->fontPtr != NULL) {
|
||
Tk_FreeFontStruct(textPtr->fontPtr);
|
||
}
|
||
if (textPtr->color != NULL) {
|
||
Tk_FreeColor(textPtr->color);
|
||
}
|
||
if (textPtr->stipple != None) {
|
||
Tk_FreeBitmap(canvasPtr->display, textPtr->stipple);
|
||
}
|
||
if (textPtr->gc != None) {
|
||
Tk_FreeGC(canvasPtr->display, textPtr->gc);
|
||
}
|
||
if (textPtr->linePtr != NULL) {
|
||
ckfree((char *) textPtr->linePtr);
|
||
}
|
||
if (textPtr->selTextGC != None) {
|
||
Tk_FreeGC(canvasPtr->display, textPtr->selTextGC);
|
||
}
|
||
}
|
||
|
||
/*
|
||
*--------------------------------------------------------------
|
||
*
|
||
* 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(canvasPtr, textPtr)
|
||
register Tk_Canvas *canvasPtr; /* Canvas that contains item. */
|
||
register TextItem *textPtr; /* Item whose bbos is to be
|
||
* recomputed. */
|
||
{
|
||
register TextLine *linePtr;
|
||
#define MAX_LINES 100
|
||
char *lineStart[MAX_LINES];
|
||
int lineChars[MAX_LINES];
|
||
int linePixels[MAX_LINES];
|
||
int numLines, wrapPixels, maxLinePixels, leftX, topY, y;
|
||
int lineHeight, i, fudge;
|
||
char *p;
|
||
XCharStruct *maxBoundsPtr = &textPtr->fontPtr->max_bounds;
|
||
|
||
if (textPtr->linePtr != NULL) {
|
||
ckfree((char *) textPtr->linePtr);
|
||
textPtr->linePtr = NULL;
|
||
}
|
||
|
||
/*
|
||
* Work through the text computing the starting point, number of
|
||
* characters, and number of pixels in each line.
|
||
*/
|
||
|
||
p = textPtr->text;
|
||
if (textPtr->width > 0) {
|
||
wrapPixels = maxLinePixels = textPtr->width;
|
||
} else {
|
||
wrapPixels = 10000000;
|
||
maxLinePixels = 0;
|
||
}
|
||
for (numLines = 0; (numLines < MAX_LINES); numLines++) {
|
||
int numChars, numPixels;
|
||
numChars = TkMeasureChars(textPtr->fontPtr, p,
|
||
(textPtr->text + textPtr->numChars) - p, 0,
|
||
wrapPixels, TK_WHOLE_WORDS|TK_AT_LEAST_ONE, &numPixels);
|
||
if (numPixels > maxLinePixels) {
|
||
maxLinePixels = numPixels;
|
||
}
|
||
lineStart[numLines] = p;
|
||
lineChars[numLines] = numChars;
|
||
linePixels[numLines] = numPixels;
|
||
p += numChars;
|
||
|
||
/*
|
||
* Skip space character that terminates a line, if there is one.
|
||
* In the case of multiple spaces, all but one will be displayed.
|
||
* This is important to make sure the insertion cursor gets
|
||
* displayed when it is in the middle of a multi-space.
|
||
*/
|
||
|
||
if (isspace(UCHAR(*p))) {
|
||
p++;
|
||
} else if (*p == 0) {
|
||
/*
|
||
* The code below is tricky. Putting the loop termination
|
||
* here guarantees that there's a TextLine for the last
|
||
* line of text, even if the line is empty (this can
|
||
* also happen if the entire text item is empty). This is
|
||
* needed so that we can display the insertion cursor on a
|
||
* line even when it is empty.
|
||
*/
|
||
|
||
numLines++;
|
||
break;
|
||
}
|
||
}
|
||
|
||
/*
|
||
* Use overall geometry information to compute the top-left corner
|
||
* of the bounding box for the text item.
|
||
*/
|
||
|
||
leftX = textPtr->x + 0.5;
|
||
topY = textPtr->y + 0.5;
|
||
lineHeight = textPtr->fontPtr->ascent + textPtr->fontPtr->descent;
|
||
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 -= (lineHeight * numLines)/2;
|
||
break;
|
||
|
||
case TK_ANCHOR_SW:
|
||
case TK_ANCHOR_S:
|
||
case TK_ANCHOR_SE:
|
||
topY -= lineHeight * numLines;
|
||
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 -= maxLinePixels/2;
|
||
break;
|
||
|
||
case TK_ANCHOR_NE:
|
||
case TK_ANCHOR_E:
|
||
case TK_ANCHOR_SE:
|
||
leftX -= maxLinePixels;
|
||
break;
|
||
}
|
||
textPtr->rightEdge = leftX + maxLinePixels;
|
||
|
||
/*
|
||
* Create the new TextLine array and fill it in using the geometry
|
||
* information gathered already.
|
||
*/
|
||
|
||
if (numLines > 0) {
|
||
textPtr->linePtr = (TextLine *) ckalloc((unsigned)
|
||
(numLines * sizeof(TextLine)));
|
||
} else {
|
||
textPtr->linePtr = NULL;
|
||
}
|
||
textPtr->numLines = numLines;
|
||
for (i = 0, linePtr = textPtr->linePtr, y = topY;
|
||
i < numLines; i++, linePtr++, y += lineHeight) {
|
||
linePtr->firstChar = lineStart[i];
|
||
linePtr->numChars = lineChars[i];
|
||
if (i == (numLines-1)) {
|
||
linePtr->totalChars = linePtr->numChars;
|
||
} else {
|
||
linePtr->totalChars = lineStart[i+1] - lineStart[i];
|
||
}
|
||
switch (textPtr->justify) {
|
||
case TK_JUSTIFY_LEFT:
|
||
case TK_JUSTIFY_FILL:
|
||
linePtr->x = leftX;
|
||
break;
|
||
case TK_JUSTIFY_CENTER:
|
||
linePtr->x = leftX + maxLinePixels/2 - linePixels[i]/2;
|
||
break;
|
||
case TK_JUSTIFY_RIGHT:
|
||
linePtr->x = leftX + maxLinePixels - linePixels[i];
|
||
break;
|
||
}
|
||
linePtr->y = y + textPtr->fontPtr->ascent;
|
||
linePtr->x1 = linePtr->x + maxBoundsPtr->lbearing;
|
||
linePtr->y1 = y;
|
||
linePtr->x2 = linePtr->x + linePixels[i];
|
||
linePtr->y2 = linePtr->y + textPtr->fontPtr->descent - 1;
|
||
}
|
||
|
||
/*
|
||
* 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).
|
||
*/
|
||
|
||
linePtr = textPtr->linePtr;
|
||
textPtr->header.x1 = textPtr->header.x2 = leftX;
|
||
textPtr->header.y1 = topY;
|
||
textPtr->header.y2 = topY + numLines*lineHeight;
|
||
for (linePtr = textPtr->linePtr, i = textPtr->numLines; i > 0;
|
||
i--, linePtr++) {
|
||
if (linePtr->x1 < textPtr->header.x1) {
|
||
textPtr->header.x1 = linePtr->x1;
|
||
}
|
||
if (linePtr->x2 >= textPtr->header.x2) {
|
||
textPtr->header.x2 = linePtr->x2 + 1;
|
||
}
|
||
}
|
||
|
||
fudge = (canvasPtr->insertWidth+1)/2;
|
||
if (canvasPtr->selBorderWidth > fudge) {
|
||
fudge = canvasPtr->selBorderWidth;
|
||
}
|
||
textPtr->header.x1 -= fudge;
|
||
textPtr->header.x2 += fudge;
|
||
}
|
||
|
||
/*
|
||
*--------------------------------------------------------------
|
||
*
|
||
* DisplayText --
|
||
*
|
||
* 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 canvasPtr.
|
||
*
|
||
*--------------------------------------------------------------
|
||
*/
|
||
|
||
static void
|
||
DisplayText(canvasPtr, itemPtr, drawable)
|
||
register Tk_Canvas *canvasPtr; /* Canvas that contains item. */
|
||
Tk_Item *itemPtr; /* Item to be displayed. */
|
||
Drawable drawable; /* Pixmap or window in which to draw
|
||
* item. */
|
||
{
|
||
register TextItem *textPtr = (TextItem *) itemPtr;
|
||
Display *display = Tk_Display(canvasPtr->tkwin);
|
||
register TextLine *linePtr;
|
||
int i, focusHere, insertX, insertIndex, lineIndex;
|
||
int beforeSelect, inSelect, afterSelect, selStartX, selEndX;
|
||
|
||
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) {
|
||
XSetTSOrigin(display, textPtr->gc,
|
||
-canvasPtr->drawableXOrigin, -canvasPtr->drawableYOrigin);
|
||
}
|
||
|
||
focusHere = (canvasPtr->focusItemPtr == itemPtr) &&
|
||
(canvasPtr->flags & GOT_FOCUS);
|
||
for (linePtr = textPtr->linePtr, i = textPtr->numLines;
|
||
i > 0; linePtr++, i--) {
|
||
|
||
/*
|
||
* If part or all of this line is selected, then draw a special
|
||
* background under the selected part of the line.
|
||
*/
|
||
|
||
lineIndex = linePtr->firstChar - textPtr->text;
|
||
if ((canvasPtr->selItemPtr != itemPtr)
|
||
|| (canvasPtr->selectLast < lineIndex)
|
||
|| (canvasPtr->selectFirst >= (lineIndex
|
||
+ linePtr->totalChars))) {
|
||
beforeSelect = linePtr->numChars;
|
||
inSelect = 0;
|
||
} else {
|
||
beforeSelect = canvasPtr->selectFirst - lineIndex;
|
||
if (beforeSelect <= 0) {
|
||
beforeSelect = 0;
|
||
selStartX = linePtr->x;
|
||
} else {
|
||
(void) TkMeasureChars(textPtr->fontPtr,
|
||
linePtr->firstChar, beforeSelect, 0,
|
||
(int) 1000000, TK_PARTIAL_OK, &selStartX);
|
||
selStartX += linePtr->x;
|
||
}
|
||
inSelect = canvasPtr->selectLast + 1 - (lineIndex + beforeSelect);
|
||
|
||
/*
|
||
* 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, hence the
|
||
* "i != 1" check.
|
||
*/
|
||
|
||
if (inSelect >= (linePtr->totalChars - beforeSelect)) {
|
||
inSelect = linePtr->numChars - beforeSelect;
|
||
if (i != 1) {
|
||
selEndX = textPtr->rightEdge;
|
||
goto fillSelectBackground;
|
||
}
|
||
}
|
||
(void) TkMeasureChars(textPtr->fontPtr,
|
||
linePtr->firstChar + beforeSelect, inSelect,
|
||
selStartX-linePtr->x, (int) 1000000, TK_PARTIAL_OK,
|
||
&selEndX);
|
||
selEndX += linePtr->x;
|
||
fillSelectBackground:
|
||
Tk_Fill3DRectangle(display, drawable, canvasPtr->selBorder,
|
||
selStartX - canvasPtr->drawableXOrigin
|
||
- canvasPtr->selBorderWidth,
|
||
linePtr->y - canvasPtr->drawableYOrigin
|
||
- textPtr->fontPtr->ascent,
|
||
selEndX - selStartX + 2*canvasPtr->selBorderWidth,
|
||
textPtr->fontPtr->ascent + textPtr->fontPtr->descent,
|
||
canvasPtr->selBorderWidth, TK_RELIEF_RAISED);
|
||
}
|
||
|
||
/*
|
||
* If the insertion cursor is in this line, 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 (focusHere) {
|
||
insertIndex = textPtr->insertPos
|
||
- (linePtr->firstChar - textPtr->text);
|
||
if ((insertIndex >= 0) && (insertIndex <= linePtr->numChars)) {
|
||
(void) TkMeasureChars(textPtr->fontPtr, linePtr->firstChar,
|
||
insertIndex, 0, (int) 1000000, TK_PARTIAL_OK, &insertX);
|
||
if (canvasPtr->flags & CURSOR_ON) {
|
||
Tk_Fill3DRectangle(display, drawable,
|
||
canvasPtr->insertBorder,
|
||
linePtr->x - canvasPtr->drawableXOrigin
|
||
+ insertX - (canvasPtr->insertWidth)/2,
|
||
linePtr->y - canvasPtr->drawableYOrigin
|
||
- textPtr->fontPtr->ascent,
|
||
canvasPtr->insertWidth,
|
||
textPtr->fontPtr->ascent
|
||
+ textPtr->fontPtr->descent,
|
||
canvasPtr->insertBorderWidth, TK_RELIEF_RAISED);
|
||
} else if (Tk_GetColorModel(canvasPtr->tkwin) != TK_COLOR){
|
||
Tk_Fill3DRectangle(display, drawable,
|
||
canvasPtr->bgBorder,
|
||
linePtr->x - canvasPtr->drawableXOrigin
|
||
+ insertX - (canvasPtr->insertWidth)/2,
|
||
linePtr->y - canvasPtr->drawableYOrigin
|
||
- textPtr->fontPtr->ascent,
|
||
canvasPtr->insertWidth,
|
||
textPtr->fontPtr->ascent
|
||
+ textPtr->fontPtr->descent,
|
||
0, TK_RELIEF_FLAT);
|
||
}
|
||
}
|
||
}
|
||
|
||
/*
|
||
* Display the text in three pieces: the part before the
|
||
* selection, the selected part (which needs a different graphics
|
||
* context), and the part after the selection.
|
||
*/
|
||
|
||
if (beforeSelect != 0) {
|
||
TkDisplayChars(display, drawable, textPtr->gc, textPtr->fontPtr,
|
||
linePtr->firstChar, beforeSelect,
|
||
linePtr->x - canvasPtr->drawableXOrigin,
|
||
linePtr->y - canvasPtr->drawableYOrigin, 0);
|
||
}
|
||
if (inSelect != 0) {
|
||
TkDisplayChars(display, drawable, textPtr->selTextGC,
|
||
textPtr->fontPtr, linePtr->firstChar + beforeSelect,
|
||
inSelect, selStartX - canvasPtr->drawableXOrigin,
|
||
linePtr->y - canvasPtr->drawableYOrigin, 0);
|
||
}
|
||
afterSelect = linePtr->numChars - beforeSelect - inSelect;
|
||
if (afterSelect > 0) {
|
||
TkDisplayChars(display, drawable, textPtr->gc, textPtr->fontPtr,
|
||
linePtr->firstChar + beforeSelect + inSelect,
|
||
afterSelect, selEndX - canvasPtr->drawableXOrigin,
|
||
linePtr->y - canvasPtr->drawableYOrigin, 0);
|
||
}
|
||
}
|
||
if (textPtr->stipple != None) {
|
||
XSetTSOrigin(display, textPtr->gc, 0, 0);
|
||
}
|
||
}
|
||
|
||
/*
|
||
*--------------------------------------------------------------
|
||
*
|
||
* TextInsert --
|
||
*
|
||
* Insert characters into a text item at a given position.
|
||
*
|
||
* Results:
|
||
* Always returns TCL_OK.
|
||
*
|
||
* Side effects:
|
||
* The text in the given item is modified. The cursor and
|
||
* selection positions are also modified to reflect the
|
||
* insertion.
|
||
*
|
||
*--------------------------------------------------------------
|
||
*/
|
||
|
||
static int
|
||
TextInsert(canvasPtr, itemPtr, beforeThis, string)
|
||
Tk_Canvas *canvasPtr; /* 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. */
|
||
{
|
||
register TextItem *textPtr = (TextItem *) itemPtr;
|
||
int length;
|
||
char *new;
|
||
|
||
length = strlen(string);
|
||
if (length == 0) {
|
||
return TCL_OK;
|
||
}
|
||
if (beforeThis < 0) {
|
||
beforeThis = 0;
|
||
}
|
||
if (beforeThis > textPtr->numChars) {
|
||
beforeThis = textPtr->numChars;
|
||
}
|
||
|
||
new = (char *) ckalloc((unsigned) (textPtr->numChars + length + 1));
|
||
strncpy(new, textPtr->text, 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 (canvasPtr->selItemPtr == itemPtr) {
|
||
if (canvasPtr->selectFirst >= beforeThis) {
|
||
canvasPtr->selectFirst += length;
|
||
}
|
||
if (canvasPtr->selectLast >= beforeThis) {
|
||
canvasPtr->selectLast += length;
|
||
}
|
||
if ((canvasPtr->anchorItemPtr == itemPtr)
|
||
&& (canvasPtr->selectAnchor >= beforeThis)) {
|
||
canvasPtr->selectAnchor += length;
|
||
}
|
||
}
|
||
if (textPtr->insertPos >= beforeThis) {
|
||
textPtr->insertPos += length;
|
||
}
|
||
ComputeTextBbox(canvasPtr, textPtr);
|
||
return TCL_OK;
|
||
}
|
||
|
||
/*
|
||
*--------------------------------------------------------------
|
||
*
|
||
* TextDeleteChars --
|
||
*
|
||
* Delete one or more characters from a text item.
|
||
*
|
||
* Results:
|
||
* Always returns TCL_OK.
|
||
*
|
||
* Side effects:
|
||
* Characters between "first" and "last", inclusive, get
|
||
* deleted from itemPtr, and things like the selection
|
||
* position get updated.
|
||
*
|
||
*--------------------------------------------------------------
|
||
*/
|
||
|
||
static int
|
||
TextDeleteChars(canvasPtr, itemPtr, first, last)
|
||
Tk_Canvas *canvasPtr; /* 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. */
|
||
{
|
||
register TextItem *textPtr = (TextItem *) itemPtr;
|
||
int count;
|
||
char *new;
|
||
|
||
if (first < 0) {
|
||
first = 0;
|
||
}
|
||
if (last >= textPtr->numChars) {
|
||
last = textPtr->numChars-1;
|
||
}
|
||
if (first > last) {
|
||
return TCL_OK;
|
||
}
|
||
count = last + 1 - first;
|
||
|
||
new = ckalloc((unsigned) (textPtr->numChars + 1 - count));
|
||
strncpy(new, textPtr->text, 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 (canvasPtr->selItemPtr == itemPtr) {
|
||
if (canvasPtr->selectFirst > first) {
|
||
canvasPtr->selectFirst -= count;
|
||
if (canvasPtr->selectFirst < first) {
|
||
canvasPtr->selectFirst = first;
|
||
}
|
||
}
|
||
if (canvasPtr->selectLast >= first) {
|
||
canvasPtr->selectLast -= count;
|
||
if (canvasPtr->selectLast < (first-1)) {
|
||
canvasPtr->selectLast = (first-1);
|
||
}
|
||
}
|
||
if (canvasPtr->selectFirst > canvasPtr->selectLast) {
|
||
canvasPtr->selItemPtr = NULL;
|
||
}
|
||
if ((canvasPtr->anchorItemPtr == itemPtr)
|
||
&& (canvasPtr->selectAnchor > first)) {
|
||
canvasPtr->selectAnchor -= count;
|
||
if (canvasPtr->selectAnchor < first) {
|
||
canvasPtr->selectAnchor = first;
|
||
}
|
||
}
|
||
}
|
||
if (textPtr->insertPos > first) {
|
||
textPtr->insertPos -= count;
|
||
if (textPtr->insertPos < first) {
|
||
textPtr->insertPos = first;
|
||
}
|
||
}
|
||
ComputeTextBbox(canvasPtr, textPtr);
|
||
return TCL_OK;
|
||
}
|
||
|
||
/*
|
||
*--------------------------------------------------------------
|
||
*
|
||
* 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 arc. If the
|
||
* point isn't inside the arc then the return value is the
|
||
* distance from the point to the arc.
|
||
*
|
||
* Side effects:
|
||
* None.
|
||
*
|
||
*--------------------------------------------------------------
|
||
*/
|
||
|
||
/* ARGSUSED */
|
||
static double
|
||
TextToPoint(canvasPtr, itemPtr, pointPtr)
|
||
Tk_Canvas *canvasPtr; /* Canvas containing itemPtr. */
|
||
Tk_Item *itemPtr; /* Item to check against point. */
|
||
double *pointPtr; /* Pointer to x and y coordinates. */
|
||
{
|
||
TextItem *textPtr = (TextItem *) itemPtr;
|
||
register TextLine *linePtr;
|
||
int i;
|
||
double xDiff, yDiff, dist, minDist;
|
||
|
||
/*
|
||
* Treat each line in the text item as a rectangle, compute the
|
||
* distance to that rectangle, and take the minimum of these
|
||
* distances. Perform most of the calculations in integer pixel
|
||
* units, since that's how the dimensions of the text are defined.
|
||
*/
|
||
|
||
minDist = -1.0;
|
||
for (linePtr = textPtr->linePtr, i = textPtr->numLines;
|
||
i > 0; linePtr++, i--) {
|
||
|
||
/*
|
||
* If the point is inside the line's rectangle, then can
|
||
* return immediately.
|
||
*/
|
||
|
||
if ((pointPtr[0] >= linePtr->x1)
|
||
&& (pointPtr[0] <= linePtr->x2)
|
||
&& (pointPtr[1] >= linePtr->y1)
|
||
&& (pointPtr[1] <= linePtr->y2)) {
|
||
return 0.0;
|
||
}
|
||
|
||
/*
|
||
* Point is outside line's rectangle; compute distance to nearest
|
||
* side.
|
||
*/
|
||
|
||
if (pointPtr[0] < linePtr->x1) {
|
||
xDiff = linePtr->x1 - pointPtr[0];
|
||
} else if (pointPtr[0] > linePtr->x2) {
|
||
xDiff = pointPtr[0] - linePtr->x2;
|
||
} else {
|
||
xDiff = 0;
|
||
}
|
||
|
||
if (pointPtr[1] < linePtr->y1) {
|
||
yDiff = linePtr->y1 - pointPtr[1];
|
||
} else if (pointPtr[1] > linePtr->y2) {
|
||
yDiff = pointPtr[1] - linePtr->y2;
|
||
} else {
|
||
yDiff = 0;
|
||
}
|
||
|
||
dist = hypot(xDiff, yDiff);
|
||
if ((dist < minDist) || (minDist < 0.0)) {
|
||
minDist = dist;
|
||
}
|
||
}
|
||
return minDist;
|
||
}
|
||
|
||
/*
|
||
*--------------------------------------------------------------
|
||
*
|
||
* 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.
|
||
*
|
||
*--------------------------------------------------------------
|
||
*/
|
||
|
||
/* ARGSUSED */
|
||
static int
|
||
TextToArea(canvasPtr, itemPtr, rectPtr)
|
||
Tk_Canvas *canvasPtr; /* 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 = (TextItem *) itemPtr;
|
||
register TextLine *linePtr;
|
||
int i, result;
|
||
|
||
/*
|
||
* Scan the lines one at a time, seeing whether each line is
|
||
* entirely in, entirely out, or overlapping the rectangle. If
|
||
* an overlap is detected, return immediately; otherwise wait
|
||
* until all lines have been processed and see if they were all
|
||
* inside or all outside.
|
||
*/
|
||
|
||
result = 0;
|
||
for (linePtr = textPtr->linePtr, i = textPtr->numLines;
|
||
i > 0; linePtr++, i--) {
|
||
if ((rectPtr[2] < linePtr->x1) || (rectPtr[0] > linePtr->x2)
|
||
|| (rectPtr[3] < linePtr->y1) || (rectPtr[1] > linePtr->y2)) {
|
||
if (result == 1) {
|
||
return 0;
|
||
}
|
||
result = -1;
|
||
continue;
|
||
}
|
||
if ((linePtr->x1 < rectPtr[0]) || (linePtr->x2 > rectPtr[2])
|
||
|| (linePtr->y1 < rectPtr[1]) || (linePtr->y2 > rectPtr[3])) {
|
||
return 0;
|
||
}
|
||
if (result == -1) {
|
||
return 0;
|
||
}
|
||
result = 1;
|
||
}
|
||
return result;
|
||
}
|
||
|
||
/*
|
||
*--------------------------------------------------------------
|
||
*
|
||
* 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(canvasPtr, itemPtr, originX, originY, scaleX, scaleY)
|
||
Tk_Canvas *canvasPtr; /* 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. */
|
||
{
|
||
register TextItem *textPtr = (TextItem *) itemPtr;
|
||
|
||
textPtr->x = originX + scaleX*(textPtr->x - originX);
|
||
textPtr->y = originY + scaleY*(textPtr->y - originY);
|
||
ComputeTextBbox(canvasPtr, 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(canvasPtr, itemPtr, deltaX, deltaY)
|
||
Tk_Canvas *canvasPtr; /* Canvas containing item. */
|
||
Tk_Item *itemPtr; /* Item that is being moved. */
|
||
double deltaX, deltaY; /* Amount by which item is to be
|
||
* moved. */
|
||
{
|
||
register TextItem *textPtr = (TextItem *) itemPtr;
|
||
|
||
textPtr->x += deltaX;
|
||
textPtr->y += deltaY;
|
||
ComputeTextBbox(canvasPtr, 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
|
||
* canvasPtr->interp->result.
|
||
*
|
||
* Side effects:
|
||
* None.
|
||
*
|
||
*--------------------------------------------------------------
|
||
*/
|
||
|
||
static int
|
||
GetTextIndex(canvasPtr, itemPtr, string, indexPtr)
|
||
Tk_Canvas *canvasPtr; /* 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. */
|
||
{
|
||
register TextItem *textPtr = (TextItem *) itemPtr;
|
||
int length;
|
||
|
||
length = strlen(string);
|
||
|
||
if (string[0] == 'e') {
|
||
if (strncmp(string, "end", length) == 0) {
|
||
*indexPtr = textPtr->numChars;
|
||
} else {
|
||
badIndex:
|
||
|
||
/*
|
||
* Some of the paths here leave messages in
|
||
* canvasPtr->interp->result, so we have to clear it out
|
||
* before storing our own message.
|
||
*/
|
||
|
||
Tcl_SetResult(canvasPtr->interp, (char *) NULL, TCL_STATIC);
|
||
Tcl_AppendResult(canvasPtr->interp, "bad index \"", string,
|
||
"\"", (char *) NULL);
|
||
return TCL_ERROR;
|
||
}
|
||
} else if (string[0] == 'i') {
|
||
if (strncmp(string, "insert", length) == 0) {
|
||
*indexPtr = textPtr->insertPos;
|
||
} else {
|
||
goto badIndex;
|
||
}
|
||
} else if (string[0] == 's') {
|
||
if (canvasPtr->selItemPtr != itemPtr) {
|
||
canvasPtr->interp->result = "selection isn't in item";
|
||
return TCL_ERROR;
|
||
}
|
||
if (length < 5) {
|
||
goto badIndex;
|
||
}
|
||
if (strncmp(string, "sel.first", length) == 0) {
|
||
*indexPtr = canvasPtr->selectFirst;
|
||
} else if (strncmp(string, "sel.last", length) == 0) {
|
||
*indexPtr = canvasPtr->selectLast;
|
||
} else {
|
||
goto badIndex;
|
||
}
|
||
} else if (string[0] == '@') {
|
||
int x, y, dummy, i;
|
||
char *end, *p;
|
||
register TextLine *linePtr;
|
||
|
||
p = string+1;
|
||
x = strtol(p, &end, 0);
|
||
if ((end == p) || (*end != ',')) {
|
||
goto badIndex;
|
||
}
|
||
p = end+1;
|
||
y = strtol(p, &end, 0);
|
||
if ((end == p) || (*end != 0)) {
|
||
goto badIndex;
|
||
}
|
||
if ((textPtr->numChars == 0) || (y < textPtr->linePtr[0].y1)) {
|
||
*indexPtr = 0;
|
||
return TCL_OK;
|
||
}
|
||
for (i = 0, linePtr = textPtr->linePtr; ; i++, linePtr++) {
|
||
if (i >= textPtr->numLines) {
|
||
*indexPtr = textPtr->numChars;
|
||
return TCL_OK;
|
||
}
|
||
if (y <= linePtr->y2) {
|
||
break;
|
||
}
|
||
}
|
||
*indexPtr = TkMeasureChars(textPtr->fontPtr, linePtr->firstChar,
|
||
linePtr->numChars, linePtr->x, x, 0, &dummy);
|
||
*indexPtr += linePtr->firstChar - textPtr->text;
|
||
} else {
|
||
if (Tcl_GetInt(canvasPtr->interp, string, indexPtr) != TCL_OK) {
|
||
goto badIndex;
|
||
}
|
||
if (*indexPtr < 0){
|
||
*indexPtr = 0;
|
||
} else if (*indexPtr > textPtr->numChars) {
|
||
*indexPtr = textPtr->numChars;
|
||
}
|
||
}
|
||
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(canvasPtr, itemPtr, index)
|
||
Tk_Canvas *canvasPtr; /* 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. */
|
||
{
|
||
register 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(canvasPtr, itemPtr, offset, buffer, maxBytes)
|
||
Tk_Canvas *canvasPtr; /* 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;
|
||
|
||
count = canvasPtr->selectLast + 1 - canvasPtr->selectFirst - offset;
|
||
if (canvasPtr->selectLast == textPtr->numChars) {
|
||
count -= 1;
|
||
}
|
||
if (count > maxBytes) {
|
||
count = maxBytes;
|
||
}
|
||
if (count <= 0) {
|
||
return 0;
|
||
}
|
||
strncpy(buffer, textPtr->text + canvasPtr->selectFirst + offset, 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 canvasPtr->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(canvasPtr, itemPtr, psInfoPtr)
|
||
Tk_Canvas *canvasPtr; /* Information about overall canvas. */
|
||
Tk_Item *itemPtr; /* Item for which Postscript is
|
||
* wanted. */
|
||
Tk_PostscriptInfo *psInfoPtr; /* Information about the Postscript;
|
||
* must be passed back to Postscript
|
||
* utility procedures. */
|
||
{
|
||
register TextItem *textPtr = (TextItem *) itemPtr;
|
||
register TextLine *linePtr;
|
||
int i;
|
||
char *xoffset = NULL, *yoffset = NULL; /* Initializations needed */
|
||
char *justify = NULL; /* only to stop compiler
|
||
* warnings. */
|
||
char buffer[500];
|
||
|
||
if (textPtr->color == NULL) {
|
||
return TCL_OK;
|
||
}
|
||
|
||
if (TkCanvPsFont(canvasPtr, psInfoPtr, textPtr->fontPtr) != TCL_OK) {
|
||
return TCL_ERROR;
|
||
}
|
||
if (TkCanvPsColor(canvasPtr, psInfoPtr, textPtr->color) != TCL_OK) {
|
||
return TCL_ERROR;
|
||
}
|
||
sprintf(buffer, "%.15g %.15g [\n", textPtr->x,
|
||
TkCanvPsY(psInfoPtr, textPtr->y));
|
||
Tcl_AppendResult(canvasPtr->interp, buffer, (char *) NULL);
|
||
for (i = textPtr->numLines, linePtr = textPtr->linePtr;
|
||
i > 0; i--, linePtr++) {
|
||
Tcl_AppendResult(canvasPtr->interp, " ", (char *) NULL);
|
||
LineToPostscript(canvasPtr->interp, linePtr->firstChar,
|
||
linePtr->numChars);
|
||
Tcl_AppendResult(canvasPtr->interp, "\n", (char *) NULL);
|
||
}
|
||
switch (textPtr->anchor) {
|
||
case TK_ANCHOR_NW: xoffset = "0"; yoffset = "0"; break;
|
||
case TK_ANCHOR_N: xoffset = "-0.5"; yoffset = "0"; break;
|
||
case TK_ANCHOR_NE: xoffset = "-1"; yoffset = "0"; break;
|
||
case TK_ANCHOR_E: xoffset = "-1"; yoffset = "0.5"; break;
|
||
case TK_ANCHOR_SE: xoffset = "-1"; yoffset = "1"; break;
|
||
case TK_ANCHOR_S: xoffset = "-0.5"; yoffset = "1"; break;
|
||
case TK_ANCHOR_SW: xoffset = "0"; yoffset = "1"; break;
|
||
case TK_ANCHOR_W: xoffset = "0"; yoffset = "0.5"; break;
|
||
case TK_ANCHOR_CENTER: xoffset = "-0.5"; yoffset = "0.5"; break;
|
||
}
|
||
switch (textPtr->justify) {
|
||
case TK_JUSTIFY_LEFT: justify = "0"; break;
|
||
case TK_JUSTIFY_FILL:
|
||
case TK_JUSTIFY_CENTER: justify = "0.5"; break;
|
||
case TK_JUSTIFY_RIGHT: justify = "1"; break;
|
||
}
|
||
sprintf(buffer, "] %d %s %s %s () false DrawText\n",
|
||
textPtr->fontPtr->ascent + textPtr->fontPtr->descent,
|
||
xoffset, yoffset, justify);
|
||
Tcl_AppendResult(canvasPtr->interp, buffer, (char *) NULL);
|
||
return TCL_OK;
|
||
}
|
||
|
||
/*
|
||
*--------------------------------------------------------------
|
||
*
|
||
* LineToPostscript --
|
||
*
|
||
* This procedure generates a parenthesized Postscript string
|
||
* describing one line of text from a text item.
|
||
*
|
||
* Results:
|
||
* None. The parenthesized string is appended to
|
||
* interp->result. It generates proper backslash notation so
|
||
* that Postscript can interpret the string correctly.
|
||
*
|
||
* Side effects:
|
||
* None.
|
||
*
|
||
*--------------------------------------------------------------
|
||
*/
|
||
|
||
static void
|
||
LineToPostscript(interp, string, numChars)
|
||
Tcl_Interp *interp; /* Interp whose result is to be appended to. */
|
||
register char *string; /* String to Postscript-ify. */
|
||
int numChars; /* Number of characters in the string. */
|
||
{
|
||
#define BUFFER_SIZE 100
|
||
char buffer[BUFFER_SIZE+5];
|
||
int used, c;
|
||
|
||
buffer[0] = '(';
|
||
used = 1;
|
||
for ( ; numChars > 0; string++, numChars--) {
|
||
c = (*string) & 0xff;
|
||
if ((c == '(') || (c == ')') || (c == '\\') || (c < 0x20)
|
||
|| (c >= 0x7f)) {
|
||
/*
|
||
* Tricky point: the "03" is necessary in the sprintf below,
|
||
* so that a full three digits of octal are always generated.
|
||
* Without the "03", a number following this sequence could
|
||
* be interpreted by Postscript as part of this sequence.
|
||
*/
|
||
sprintf(buffer+used, "\\%03o", c);
|
||
used += strlen(buffer+used);
|
||
} else {
|
||
buffer[used] = c;
|
||
used++;
|
||
}
|
||
if (used >= BUFFER_SIZE) {
|
||
buffer[used] = 0;
|
||
Tcl_AppendResult(interp, buffer, (char *) NULL);
|
||
used = 0;
|
||
}
|
||
}
|
||
buffer[used] = ')';
|
||
buffer[used+1] = 0;
|
||
Tcl_AppendResult(interp, buffer, (char *) NULL);
|
||
}
|