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authorrjohnson <rjohnson>1998-04-01 09:51:44 (GMT)
committerrjohnson <rjohnson>1998-04-01 09:51:44 (GMT)
commit066ea7fd88d49cb456f74da71dbe875e4fc0aabb (patch)
tree8fb30cb152c4dc191be47fa043d2e6f5ea38c7ba /generic/tkCanvText.c
parent13242623d2ff3ea02ab6a62bfb48a7dbb5c27e22 (diff)
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+/*
+ * 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;
+}