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Diffstat (limited to 'generic/tkCanvText.c')
| -rw-r--r-- | generic/tkCanvText.c | 1313 |
1 files changed, 1313 insertions, 0 deletions
diff --git a/generic/tkCanvText.c b/generic/tkCanvText.c new file mode 100644 index 0000000..2938ba1 --- /dev/null +++ b/generic/tkCanvText.c @@ -0,0 +1,1313 @@ +/* + * 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. + * + * SCCS: @(#) tkCanvText.c 1.68 97/10/09 17:44:53 + */ + +#include <stdio.h> +#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; +} |