903 lines
26 KiB
C
903 lines
26 KiB
C
/*
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* tkImage.c --
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*
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* This file contains code that allows images to be
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* nested inside text widgets. It also implements the "image"
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* widget command for texts.
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*
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* Copyright (c) 1996 Sun Microsystems, Inc.
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*
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* See the file "license.terms" for information on usage and redistribution
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* of this file, and for a DISCLAIMER OF ALL WARRANTIES.
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*
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* SCCS: @(#) tkTextImage.c 1.7 97/08/25 15:47:27
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*/
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#include "tk.h"
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#include "tkText.h"
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#include "tkPort.h"
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/*
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* Definitions for alignment values:
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*/
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#define ALIGN_BOTTOM 0
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#define ALIGN_CENTER 1
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#define ALIGN_TOP 2
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#define ALIGN_BASELINE 3
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/*
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* Macro that determines the size of an embedded image segment:
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*/
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#define EI_SEG_SIZE ((unsigned) (Tk_Offset(TkTextSegment, body) \
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+ sizeof(TkTextEmbImage)))
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/*
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* Prototypes for procedures defined in this file:
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*/
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static int AlignParseProc _ANSI_ARGS_((ClientData clientData,
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Tcl_Interp *interp, Tk_Window tkwin, char *value,
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char *widgRec, int offset));
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static char * AlignPrintProc _ANSI_ARGS_((ClientData clientData,
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Tk_Window tkwin, char *widgRec, int offset,
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Tcl_FreeProc **freeProcPtr));
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static TkTextSegment * EmbImageCleanupProc _ANSI_ARGS_((TkTextSegment *segPtr,
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TkTextLine *linePtr));
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static void EmbImageCheckProc _ANSI_ARGS_((TkTextSegment *segPtr,
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TkTextLine *linePtr));
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static void EmbImageBboxProc _ANSI_ARGS_((TkTextDispChunk *chunkPtr,
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int index, int y, int lineHeight, int baseline,
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int *xPtr, int *yPtr, int *widthPtr,
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int *heightPtr));
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static int EmbImageConfigure _ANSI_ARGS_((TkText *textPtr,
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TkTextSegment *eiPtr, int argc, char **argv));
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static int EmbImageDeleteProc _ANSI_ARGS_((TkTextSegment *segPtr,
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TkTextLine *linePtr, int treeGone));
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static void EmbImageDisplayProc _ANSI_ARGS_((
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TkTextDispChunk *chunkPtr, int x, int y,
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int lineHeight, int baseline, Display *display,
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Drawable dst, int screenY));
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static int EmbImageLayoutProc _ANSI_ARGS_((TkText *textPtr,
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TkTextIndex *indexPtr, TkTextSegment *segPtr,
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int offset, int maxX, int maxChars,
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int noCharsYet, Tk_Uid wrapMode,
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TkTextDispChunk *chunkPtr));
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static void EmbImageProc _ANSI_ARGS_((ClientData clientData,
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int x, int y, int width, int height,
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int imageWidth, int imageHeight));
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/*
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* The following structure declares the "embedded image" segment type.
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*/
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static Tk_SegType tkTextEmbImageType = {
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"image", /* name */
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0, /* leftGravity */
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(Tk_SegSplitProc *) NULL, /* splitProc */
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EmbImageDeleteProc, /* deleteProc */
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EmbImageCleanupProc, /* cleanupProc */
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(Tk_SegLineChangeProc *) NULL, /* lineChangeProc */
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EmbImageLayoutProc, /* layoutProc */
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EmbImageCheckProc /* checkProc */
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};
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/*
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* Information used for parsing image configuration options:
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*/
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static Tk_CustomOption alignOption = {AlignParseProc, AlignPrintProc,
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(ClientData) NULL};
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static Tk_ConfigSpec configSpecs[] = {
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{TK_CONFIG_CUSTOM, "-align", (char *) NULL, (char *) NULL,
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"center", 0, TK_CONFIG_DONT_SET_DEFAULT, &alignOption},
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{TK_CONFIG_PIXELS, "-padx", (char *) NULL, (char *) NULL,
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"0", Tk_Offset(TkTextEmbImage, padX),
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TK_CONFIG_DONT_SET_DEFAULT},
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{TK_CONFIG_PIXELS, "-pady", (char *) NULL, (char *) NULL,
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"0", Tk_Offset(TkTextEmbImage, padY),
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TK_CONFIG_DONT_SET_DEFAULT},
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#ifdef SCM_CODE
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{TK_CONFIG_IMAGE, "-image", (char *) NULL, (char *) NULL,
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#else
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{TK_CONFIG_STRING, "-image", (char *) NULL, (char *) NULL,
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#endif
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(char *) NULL, Tk_Offset(TkTextEmbImage, imageString),
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TK_CONFIG_DONT_SET_DEFAULT|TK_CONFIG_NULL_OK},
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{TK_CONFIG_STRING, "-name", (char *) NULL, (char *) NULL,
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(char *) NULL, Tk_Offset(TkTextEmbImage, imageName),
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TK_CONFIG_DONT_SET_DEFAULT|TK_CONFIG_NULL_OK},
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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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*--------------------------------------------------------------
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*
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* TkTextImageCmd --
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*
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* This procedure implements the "image" widget command
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* for text widgets. See the user documentation for details
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* on what it does.
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*
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* Results:
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* A standard Tcl result or error.
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*
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* Side effects:
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* See the user documentation.
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*
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*--------------------------------------------------------------
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*/
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int
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TkTextImageCmd(textPtr, interp, argc, argv)
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register TkText *textPtr; /* Information about text widget. */
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Tcl_Interp *interp; /* Current interpreter. */
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int argc; /* Number of arguments. */
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char **argv; /* Argument strings. Someone else has already
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* parsed this command enough to know that
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* argv[1] is "image". */
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{
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size_t length;
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register TkTextSegment *eiPtr;
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if (argc < 3) {
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Tcl_AppendResult(interp, "wrong # args: should be \"",
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argv[0], " image option ?arg arg ...?\"", (char *) NULL);
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return TCL_ERROR;
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}
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length = strlen(argv[2]);
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if ((strncmp(argv[2], "cget", length) == 0) && (length >= 2)) {
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TkTextIndex index;
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TkTextSegment *eiPtr;
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if (argc != 5) {
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Tcl_AppendResult(interp, "wrong # args: should be \"",
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argv[0], " image cget index option\"",
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(char *) NULL);
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return TCL_ERROR;
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}
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if (TkTextGetIndex(interp, textPtr, argv[3], &index) != TCL_OK) {
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return TCL_ERROR;
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}
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eiPtr = TkTextIndexToSeg(&index, (int *) NULL);
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if (eiPtr->typePtr != &tkTextEmbImageType) {
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Tcl_AppendResult(interp, "no embedded image at index \"",
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argv[3], "\"", (char *) NULL);
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return TCL_ERROR;
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}
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return Tk_ConfigureValue(interp, textPtr->tkwin, configSpecs,
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(char *) &eiPtr->body.ei, argv[4], 0);
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} else if ((strncmp(argv[2], "configure", length) == 0) && (length >= 2)) {
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TkTextIndex index;
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TkTextSegment *eiPtr;
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if (argc < 4) {
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Tcl_AppendResult(interp, "wrong # args: should be \"",
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argv[0], " image configure index ?option value ...?\"",
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(char *) NULL);
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return TCL_ERROR;
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}
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if (TkTextGetIndex(interp, textPtr, argv[3], &index) != TCL_OK) {
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return TCL_ERROR;
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}
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eiPtr = TkTextIndexToSeg(&index, (int *) NULL);
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if (eiPtr->typePtr != &tkTextEmbImageType) {
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Tcl_AppendResult(interp, "no embedded image at index \"",
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argv[3], "\"", (char *) NULL);
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return TCL_ERROR;
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}
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if (argc == 4) {
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return Tk_ConfigureInfo(interp, textPtr->tkwin, configSpecs,
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(char *) &eiPtr->body.ei, (char *) NULL, 0);
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} else if (argc == 5) {
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return Tk_ConfigureInfo(interp, textPtr->tkwin, configSpecs,
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(char *) &eiPtr->body.ei, argv[4], 0);
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} else {
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TkTextChanged(textPtr, &index, &index);
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return EmbImageConfigure(textPtr, eiPtr, argc-4, argv+4);
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}
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} else if ((strncmp(argv[2], "create", length) == 0) && (length >= 2)) {
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TkTextIndex index;
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int lineIndex;
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/*
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* Add a new image. Find where to put the new image, and
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* mark that position for redisplay.
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*/
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if (argc < 4) {
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Tcl_AppendResult(interp, "wrong # args: should be \"",
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argv[0], " image create index ?option value ...?\"",
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(char *) NULL);
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return TCL_ERROR;
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}
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if (TkTextGetIndex(interp, textPtr, argv[3], &index) != TCL_OK) {
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return TCL_ERROR;
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}
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/*
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* Don't allow insertions on the last (dummy) line of the text.
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*/
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lineIndex = TkBTreeLineIndex(index.linePtr);
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if (lineIndex == TkBTreeNumLines(textPtr->tree)) {
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lineIndex--;
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TkTextMakeIndex(textPtr->tree, lineIndex, 1000000, &index);
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}
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/*
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* Create the new image segment and initialize it.
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*/
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eiPtr = (TkTextSegment *) ckalloc(EI_SEG_SIZE);
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eiPtr->typePtr = &tkTextEmbImageType;
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eiPtr->size = 1;
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eiPtr->body.ei.textPtr = textPtr;
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eiPtr->body.ei.linePtr = NULL;
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eiPtr->body.ei.imageName = NULL;
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eiPtr->body.ei.imageString = NULL;
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eiPtr->body.ei.name = NULL;
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eiPtr->body.ei.image = NULL;
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eiPtr->body.ei.align = ALIGN_CENTER;
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eiPtr->body.ei.padX = eiPtr->body.ei.padY = 0;
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eiPtr->body.ei.chunkCount = 0;
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/*
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* Link the segment into the text widget, then configure it (delete
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* it again if the configuration fails).
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*/
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TkTextChanged(textPtr, &index, &index);
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TkBTreeLinkSegment(eiPtr, &index);
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if (EmbImageConfigure(textPtr, eiPtr, argc-4, argv+4) != TCL_OK) {
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TkTextIndex index2;
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TkTextIndexForwChars(&index, 1, &index2);
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TkBTreeDeleteChars(&index, &index2);
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return TCL_ERROR;
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}
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} else if (strncmp(argv[2], "names", length) == 0) {
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Tcl_HashSearch search;
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Tcl_HashEntry *hPtr;
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if (argc != 3) {
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Tcl_AppendResult(interp, "wrong # args: should be \"",
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argv[0], " image names\"", (char *) NULL);
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return TCL_ERROR;
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}
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for (hPtr = Tcl_FirstHashEntry(&textPtr->imageTable, &search);
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hPtr != NULL; hPtr = Tcl_NextHashEntry(&search)) {
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Tcl_AppendElement(interp,
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Tcl_GetHashKey(&textPtr->markTable, hPtr));
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}
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} else {
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Tcl_AppendResult(interp, "bad image option \"", argv[2],
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"\": must be cget, configure, create, or names",
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(char *) NULL);
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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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* EmbImageConfigure --
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*
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* This procedure is called to handle configuration options
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* for an embedded image, using an argc/argv list.
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*
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* Results:
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* The return value is a standard Tcl result. If TCL_ERROR is
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* returned, then interp->result contains an error message..
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*
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* Side effects:
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* Configuration information for the embedded image changes,
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* such as alignment, or name of the image.
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*
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*--------------------------------------------------------------
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*/
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static int
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EmbImageConfigure(textPtr, eiPtr, argc, argv)
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TkText *textPtr; /* Information about text widget that
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* contains embedded image. */
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TkTextSegment *eiPtr; /* Embedded image to be configured. */
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int argc; /* Number of strings in argv. */
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char **argv; /* Array of strings describing configuration
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* options. */
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{
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Tk_Image image;
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Tcl_DString newName;
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Tcl_HashEntry *hPtr;
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Tcl_HashSearch search;
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int new;
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char *name;
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int count = 0; /* The counter for picking a unique name */
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int conflict = 0; /* True if we have a name conflict */
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unsigned int len; /* length of image name */
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if (Tk_ConfigureWidget(textPtr->interp, textPtr->tkwin, configSpecs,
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argc, argv, (char *) &eiPtr->body.ei,TK_CONFIG_ARGV_ONLY)
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!= TCL_OK) {
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return TCL_ERROR;
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}
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/*
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* Create the image. Save the old image around and don't free it
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* until after the new one is allocated. This keeps the reference
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* count from going to zero so the image doesn't have to be recreated
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* if it hasn't changed.
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*/
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if (eiPtr->body.ei.imageString != NULL) {
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image = Tk_GetImage(textPtr->interp, textPtr->tkwin, eiPtr->body.ei.imageString,
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EmbImageProc, (ClientData) eiPtr);
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if (image == NULL) {
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return TCL_ERROR;
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}
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} else {
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image = NULL;
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}
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if (eiPtr->body.ei.image != NULL) {
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Tk_FreeImage(eiPtr->body.ei.image);
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}
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eiPtr->body.ei.image = image;
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if (eiPtr->body.ei.name != NULL) {
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return TCL_OK;
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}
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/*
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* Find a unique name for this image. Use imageName (or imageString)
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* if available, otherwise tack on a #nn and use it. If a name is already
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* associated with this image, delete the name.
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*/
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name = eiPtr->body.ei.imageName;
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if (name == NULL) {
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name = eiPtr->body.ei.imageString;
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}
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if (name == NULL) {
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Tcl_AppendResult(textPtr->interp,"Either a \"-name\" ",
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"or a \"-image\" argument must be provided ",
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"to the \"image create\" subcommand.",
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(char *) NULL);
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return TCL_ERROR;
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}
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len = strlen(name);
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for (hPtr = Tcl_FirstHashEntry(&textPtr->imageTable, &search);
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hPtr != NULL; hPtr = Tcl_NextHashEntry(&search)) {
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char *haveName = Tcl_GetHashKey(&textPtr->imageTable, hPtr);
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if (strncmp(name, haveName, len) == 0) {
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new = 0;
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sscanf(haveName+len,"#%d",&new);
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if (new > count) {
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count = new;
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}
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if (len == (int) strlen(haveName)) {
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conflict = 1;
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}
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}
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}
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Tcl_DStringInit(&newName);
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Tcl_DStringAppend(&newName,name, -1);
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if (conflict) {
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char buf[10];
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sprintf(buf, "#%d",count+1);
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Tcl_DStringAppend(&newName,buf, -1);
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}
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name = Tcl_DStringValue(&newName);
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hPtr = Tcl_CreateHashEntry(&textPtr->imageTable, name, &new);
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Tcl_SetHashValue(hPtr, eiPtr);
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Tcl_AppendResult(textPtr->interp, name , (char *) NULL);
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eiPtr->body.ei.name = ckalloc((unsigned) Tcl_DStringLength(&newName)+1);
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strcpy(eiPtr->body.ei.name,name);
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Tcl_DStringFree(&newName);
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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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* AlignParseProc --
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*
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* This procedure is invoked by Tk_ConfigureWidget during
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* option processing to handle "-align" options for embedded
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* images.
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*
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* Results:
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* A standard Tcl return value.
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*
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* Side effects:
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* The alignment for the embedded image may change.
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*
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*--------------------------------------------------------------
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*/
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/* ARGSUSED */
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static int
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AlignParseProc(clientData, interp, tkwin, value, widgRec, offset)
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ClientData clientData; /* Not used.*/
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Tcl_Interp *interp; /* Used for reporting errors. */
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Tk_Window tkwin; /* Window for text widget. */
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char *value; /* Value of option. */
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char *widgRec; /* Pointer to TkTextEmbWindow
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* structure. */
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int offset; /* Offset into item (ignored). */
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{
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register TkTextEmbImage *embPtr = (TkTextEmbImage *) widgRec;
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if (strcmp(value, "baseline") == 0) {
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embPtr->align = ALIGN_BASELINE;
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} else if (strcmp(value, "bottom") == 0) {
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embPtr->align = ALIGN_BOTTOM;
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} else if (strcmp(value, "center") == 0) {
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embPtr->align = ALIGN_CENTER;
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} else if (strcmp(value, "top") == 0) {
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embPtr->align = ALIGN_TOP;
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} else {
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Tcl_AppendResult(interp, "bad alignment \"", value,
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"\": must be baseline, bottom, center, or top",
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(char *) NULL);
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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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* AlignPrintProc --
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*
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* This procedure is invoked by the Tk configuration code
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* to produce a printable string for the "-align" configuration
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* option for embedded images.
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*
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* Results:
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* The return value is a string describing the embedded
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* images's current alignment.
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*
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* Side effects:
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* None.
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*
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*--------------------------------------------------------------
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*/
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/* ARGSUSED */
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static char *
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AlignPrintProc(clientData, tkwin, widgRec, offset, freeProcPtr)
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ClientData clientData; /* Ignored. */
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Tk_Window tkwin; /* Window for text widget. */
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char *widgRec; /* Pointer to TkTextEmbImage
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* structure. */
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int offset; /* Ignored. */
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Tcl_FreeProc **freeProcPtr; /* Pointer to variable to fill in with
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* information about how to reclaim
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* storage for return string. */
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{
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switch (((TkTextEmbImage *) widgRec)->align) {
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case ALIGN_BASELINE:
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return "baseline";
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case ALIGN_BOTTOM:
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return "bottom";
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case ALIGN_CENTER:
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return "center";
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case ALIGN_TOP:
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return "top";
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default:
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return "??";
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}
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}
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||
/*
|
||
*--------------------------------------------------------------
|
||
*
|
||
* EmbImageDeleteProc --
|
||
*
|
||
* This procedure is invoked by the text B-tree code whenever
|
||
* an embedded image lies in a range of characters being deleted.
|
||
*
|
||
* Results:
|
||
* Returns 0 to indicate that the deletion has been accepted.
|
||
*
|
||
* Side effects:
|
||
* The embedded image is deleted, if it exists, and any resources
|
||
* associated with it are released.
|
||
*
|
||
*--------------------------------------------------------------
|
||
*/
|
||
|
||
/* ARGSUSED */
|
||
static int
|
||
EmbImageDeleteProc(eiPtr, linePtr, treeGone)
|
||
TkTextSegment *eiPtr; /* Segment being deleted. */
|
||
TkTextLine *linePtr; /* Line containing segment. */
|
||
int treeGone; /* Non-zero means the entire tree is
|
||
* being deleted, so everything must
|
||
* get cleaned up. */
|
||
{
|
||
Tcl_HashEntry *hPtr;
|
||
|
||
if (eiPtr->body.ei.image != NULL) {
|
||
hPtr = Tcl_FindHashEntry(&eiPtr->body.ei.textPtr->imageTable,
|
||
eiPtr->body.ei.name);
|
||
if (hPtr != NULL) {
|
||
/*
|
||
* (It's possible for there to be no hash table entry for this
|
||
* image, if an error occurred while creating the image segment
|
||
* but before the image got added to the table)
|
||
*/
|
||
|
||
Tcl_DeleteHashEntry(hPtr);
|
||
}
|
||
Tk_FreeImage(eiPtr->body.ei.image);
|
||
}
|
||
Tk_FreeOptions(configSpecs, (char *) &eiPtr->body.ei,
|
||
eiPtr->body.ei.textPtr->display, 0);
|
||
if (eiPtr->body.ei.name != NULL) {
|
||
ckfree(eiPtr->body.ei.name);
|
||
}
|
||
ckfree((char *) eiPtr);
|
||
return 0;
|
||
}
|
||
|
||
/*
|
||
*--------------------------------------------------------------
|
||
*
|
||
* EmbImageCleanupProc --
|
||
*
|
||
* This procedure is invoked by the B-tree code whenever a
|
||
* segment containing an embedded image is moved from one
|
||
* line to another.
|
||
*
|
||
* Results:
|
||
* None.
|
||
*
|
||
* Side effects:
|
||
* The linePtr field of the segment gets updated.
|
||
*
|
||
*--------------------------------------------------------------
|
||
*/
|
||
|
||
static TkTextSegment *
|
||
EmbImageCleanupProc(eiPtr, linePtr)
|
||
TkTextSegment *eiPtr; /* Mark segment that's being moved. */
|
||
TkTextLine *linePtr; /* Line that now contains segment. */
|
||
{
|
||
eiPtr->body.ei.linePtr = linePtr;
|
||
return eiPtr;
|
||
}
|
||
|
||
/*
|
||
*--------------------------------------------------------------
|
||
*
|
||
* EmbImageLayoutProc --
|
||
*
|
||
* This procedure is the "layoutProc" for embedded image
|
||
* segments.
|
||
*
|
||
* Results:
|
||
* 1 is returned to indicate that the segment should be
|
||
* displayed. The chunkPtr structure is filled in.
|
||
*
|
||
* Side effects:
|
||
* None, except for filling in chunkPtr.
|
||
*
|
||
*--------------------------------------------------------------
|
||
*/
|
||
|
||
/*ARGSUSED*/
|
||
static int
|
||
EmbImageLayoutProc(textPtr, indexPtr, eiPtr, offset, maxX, maxChars,
|
||
noCharsYet, wrapMode, chunkPtr)
|
||
TkText *textPtr; /* Text widget being layed out. */
|
||
TkTextIndex *indexPtr; /* Identifies first character in chunk. */
|
||
TkTextSegment *eiPtr; /* Segment corresponding to indexPtr. */
|
||
int offset; /* Offset within segPtr corresponding to
|
||
* indexPtr (always 0). */
|
||
int maxX; /* Chunk must not occupy pixels at this
|
||
* position or higher. */
|
||
int maxChars; /* Chunk must not include more than this
|
||
* many characters. */
|
||
int noCharsYet; /* Non-zero means no characters have been
|
||
* assigned to this line yet. */
|
||
Tk_Uid wrapMode; /* Wrap mode to use for line: tkTextCharUid,
|
||
* tkTextNoneUid, or tkTextWordUid. */
|
||
register TkTextDispChunk *chunkPtr;
|
||
/* Structure to fill in with information
|
||
* about this chunk. The x field has already
|
||
* been set by the caller. */
|
||
{
|
||
int width, height;
|
||
|
||
if (offset != 0) {
|
||
panic("Non-zero offset in EmbImageLayoutProc");
|
||
}
|
||
|
||
/*
|
||
* See if there's room for this image on this line.
|
||
*/
|
||
|
||
if (eiPtr->body.ei.image == NULL) {
|
||
width = 0;
|
||
height = 0;
|
||
} else {
|
||
Tk_SizeOfImage(eiPtr->body.ei.image, &width, &height);
|
||
width += 2*eiPtr->body.ei.padX;
|
||
height += 2*eiPtr->body.ei.padY;
|
||
}
|
||
if ((width > (maxX - chunkPtr->x))
|
||
&& !noCharsYet && (textPtr->wrapMode != tkTextNoneUid)) {
|
||
return 0;
|
||
}
|
||
|
||
/*
|
||
* Fill in the chunk structure.
|
||
*/
|
||
|
||
chunkPtr->displayProc = EmbImageDisplayProc;
|
||
chunkPtr->undisplayProc = (Tk_ChunkUndisplayProc *) NULL;
|
||
chunkPtr->measureProc = (Tk_ChunkMeasureProc *) NULL;
|
||
chunkPtr->bboxProc = EmbImageBboxProc;
|
||
chunkPtr->numChars = 1;
|
||
if (eiPtr->body.ei.align == ALIGN_BASELINE) {
|
||
chunkPtr->minAscent = height - eiPtr->body.ei.padY;
|
||
chunkPtr->minDescent = eiPtr->body.ei.padY;
|
||
chunkPtr->minHeight = 0;
|
||
} else {
|
||
chunkPtr->minAscent = 0;
|
||
chunkPtr->minDescent = 0;
|
||
chunkPtr->minHeight = height;
|
||
}
|
||
chunkPtr->width = width;
|
||
chunkPtr->breakIndex = -1;
|
||
chunkPtr->breakIndex = 1;
|
||
chunkPtr->clientData = (ClientData) eiPtr;
|
||
eiPtr->body.ei.chunkCount += 1;
|
||
return 1;
|
||
}
|
||
|
||
/*
|
||
*--------------------------------------------------------------
|
||
*
|
||
* EmbImageCheckProc --
|
||
*
|
||
* This procedure is invoked by the B-tree code to perform
|
||
* consistency checks on embedded images.
|
||
*
|
||
* Results:
|
||
* None.
|
||
*
|
||
* Side effects:
|
||
* The procedure panics if it detects anything wrong with
|
||
* the embedded image.
|
||
*
|
||
*--------------------------------------------------------------
|
||
*/
|
||
|
||
static void
|
||
EmbImageCheckProc(eiPtr, linePtr)
|
||
TkTextSegment *eiPtr; /* Segment to check. */
|
||
TkTextLine *linePtr; /* Line containing segment. */
|
||
{
|
||
if (eiPtr->nextPtr == NULL) {
|
||
panic("EmbImageCheckProc: embedded image is last segment in line");
|
||
}
|
||
if (eiPtr->size != 1) {
|
||
panic("EmbImageCheckProc: embedded image has size %d", eiPtr->size);
|
||
}
|
||
}
|
||
|
||
/*
|
||
*--------------------------------------------------------------
|
||
*
|
||
* EmbImageDisplayProc --
|
||
*
|
||
* This procedure is invoked by the text displaying code
|
||
* when it is time to actually draw an embedded image
|
||
* chunk on the screen.
|
||
*
|
||
* Results:
|
||
* None.
|
||
*
|
||
* Side effects:
|
||
* The embedded image gets moved to the correct location
|
||
* and drawn onto the display.
|
||
*
|
||
*--------------------------------------------------------------
|
||
*/
|
||
|
||
static void
|
||
EmbImageDisplayProc(chunkPtr, x, y, lineHeight, baseline, display, dst, screenY)
|
||
TkTextDispChunk *chunkPtr; /* Chunk that is to be drawn. */
|
||
int x; /* X-position in dst at which to
|
||
* draw this chunk (differs from
|
||
* the x-position in the chunk because
|
||
* of scrolling). */
|
||
int y; /* Top of rectangular bounding box
|
||
* for line: tells where to draw this
|
||
* chunk in dst (x-position is in
|
||
* the chunk itself). */
|
||
int lineHeight; /* Total height of line. */
|
||
int baseline; /* Offset of baseline from y. */
|
||
Display *display; /* Display to use for drawing. */
|
||
Drawable dst; /* Pixmap or window in which to draw */
|
||
int screenY; /* Y-coordinate in text window that
|
||
* corresponds to y. */
|
||
{
|
||
TkTextSegment *eiPtr = (TkTextSegment *) chunkPtr->clientData;
|
||
int lineX, imageX, imageY, width, height;
|
||
Tk_Image image;
|
||
|
||
image = eiPtr->body.ei.image;
|
||
if (image == NULL) {
|
||
return;
|
||
}
|
||
if ((x + chunkPtr->width) <= 0) {
|
||
return;
|
||
}
|
||
|
||
/*
|
||
* Compute the image's location and size in the text widget, taking
|
||
* into account the align value for the image.
|
||
*/
|
||
|
||
EmbImageBboxProc(chunkPtr, 0, y, lineHeight, baseline, &lineX,
|
||
&imageY, &width, &height);
|
||
imageX = lineX - chunkPtr->x + x;
|
||
|
||
Tk_RedrawImage(image, 0, 0, width, height, dst,
|
||
imageX, imageY);
|
||
}
|
||
|
||
/*
|
||
*--------------------------------------------------------------
|
||
*
|
||
* EmbImageBboxProc --
|
||
*
|
||
* This procedure is called to compute the bounding box of
|
||
* the area occupied by an embedded image.
|
||
*
|
||
* Results:
|
||
* There is no return value. *xPtr and *yPtr are filled in
|
||
* with the coordinates of the upper left corner of the
|
||
* image, and *widthPtr and *heightPtr are filled in with
|
||
* the dimensions of the image in pixels. Note: not all
|
||
* of the returned bbox is necessarily visible on the screen
|
||
* (the rightmost part might be off-screen to the right,
|
||
* and the bottommost part might be off-screen to the bottom).
|
||
*
|
||
* Side effects:
|
||
* None.
|
||
*
|
||
*--------------------------------------------------------------
|
||
*/
|
||
|
||
static void
|
||
EmbImageBboxProc(chunkPtr, index, y, lineHeight, baseline, xPtr, yPtr,
|
||
widthPtr, heightPtr)
|
||
TkTextDispChunk *chunkPtr; /* Chunk containing desired char. */
|
||
int index; /* Index of desired character within
|
||
* the chunk. */
|
||
int y; /* Topmost pixel in area allocated
|
||
* for this line. */
|
||
int lineHeight; /* Total height of line. */
|
||
int baseline; /* Location of line's baseline, in
|
||
* pixels measured down from y. */
|
||
int *xPtr, *yPtr; /* Gets filled in with coords of
|
||
* character's upper-left pixel. */
|
||
int *widthPtr; /* Gets filled in with width of
|
||
* character, in pixels. */
|
||
int *heightPtr; /* Gets filled in with height of
|
||
* character, in pixels. */
|
||
{
|
||
TkTextSegment *eiPtr = (TkTextSegment *) chunkPtr->clientData;
|
||
Tk_Image image;
|
||
|
||
image = eiPtr->body.ei.image;
|
||
if (image != NULL) {
|
||
Tk_SizeOfImage(image, widthPtr, heightPtr);
|
||
} else {
|
||
*widthPtr = 0;
|
||
*heightPtr = 0;
|
||
}
|
||
*xPtr = chunkPtr->x + eiPtr->body.ei.padX;
|
||
switch (eiPtr->body.ei.align) {
|
||
case ALIGN_BOTTOM:
|
||
*yPtr = y + (lineHeight - *heightPtr - eiPtr->body.ei.padY);
|
||
break;
|
||
case ALIGN_CENTER:
|
||
*yPtr = y + (lineHeight - *heightPtr)/2;
|
||
break;
|
||
case ALIGN_TOP:
|
||
*yPtr = y + eiPtr->body.ei.padY;
|
||
break;
|
||
case ALIGN_BASELINE:
|
||
*yPtr = y + (baseline - *heightPtr);
|
||
break;
|
||
}
|
||
}
|
||
|
||
/*
|
||
*--------------------------------------------------------------
|
||
*
|
||
* TkTextImageIndex --
|
||
*
|
||
* Given the name of an embedded image within a text widget,
|
||
* returns an index corresponding to the image's position
|
||
* in the text.
|
||
*
|
||
* Results:
|
||
* The return value is 1 if there is an embedded image by
|
||
* the given name in the text widget, 0 otherwise. If the
|
||
* image exists, *indexPtr is filled in with its index.
|
||
*
|
||
* Side effects:
|
||
* None.
|
||
*
|
||
*--------------------------------------------------------------
|
||
*/
|
||
|
||
int
|
||
TkTextImageIndex(textPtr, name, indexPtr)
|
||
TkText *textPtr; /* Text widget containing image. */
|
||
char *name; /* Name of image. */
|
||
TkTextIndex *indexPtr; /* Index information gets stored here. */
|
||
{
|
||
Tcl_HashEntry *hPtr;
|
||
TkTextSegment *eiPtr;
|
||
|
||
hPtr = Tcl_FindHashEntry(&textPtr->imageTable, name);
|
||
if (hPtr == NULL) {
|
||
return 0;
|
||
}
|
||
eiPtr = (TkTextSegment *) Tcl_GetHashValue(hPtr);
|
||
indexPtr->tree = textPtr->tree;
|
||
indexPtr->linePtr = eiPtr->body.ei.linePtr;
|
||
indexPtr->charIndex = TkTextSegToOffset(eiPtr, indexPtr->linePtr);
|
||
return 1;
|
||
}
|
||
|
||
/*
|
||
*--------------------------------------------------------------
|
||
*
|
||
* EmbImageProc --
|
||
*
|
||
* This procedure is called by the image code whenever an
|
||
* image or its contents changes.
|
||
*
|
||
* Results:
|
||
* None.
|
||
*
|
||
* Side effects:
|
||
* The image will be redisplayed.
|
||
*
|
||
*--------------------------------------------------------------
|
||
*/
|
||
|
||
static void
|
||
EmbImageProc(clientData, x, y, width, height, imgWidth, imgHeight)
|
||
ClientData clientData; /* Pointer to widget record. */
|
||
int x, y; /* Upper left pixel (within image)
|
||
* that must be redisplayed. */
|
||
int width, height; /* Dimensions of area to redisplay
|
||
* (may be <= 0). */
|
||
int imgWidth, imgHeight; /* New dimensions of image. */
|
||
|
||
{
|
||
TkTextSegment *eiPtr = (TkTextSegment *) clientData;
|
||
TkTextIndex index;
|
||
|
||
index.tree = eiPtr->body.ei.textPtr->tree;
|
||
index.linePtr = eiPtr->body.ei.linePtr;
|
||
index.charIndex = TkTextSegToOffset(eiPtr, eiPtr->body.ei.linePtr);
|
||
TkTextChanged(eiPtr->body.ei.textPtr, &index, &index);
|
||
}
|