tkscrollbar.c

linux系统下的音频通信

/* 
 * tkScrollbar.c --
 *
 *	This module implements a scrollbar widgets for the Tk
 *	toolkit.  A scrollbar displays a slider and two arrows;
 *	mouse clicks on features within the scrollbar cause
 *	scrolling commands to be invoked.
 *
 * Copyright (c) 1990-1994 The Regents of the University of California.
 * Copyright (c) 1994-1997 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: @(#) tkScrollbar.c 1.94 97/07/31 09:12:44
 */

#include "tkPort.h"
#include "tkScrollbar.h"
#include "default.h"

/*
 * Information used for argv parsing.
 */

Tk_ConfigSpec tkpScrollbarConfigSpecs[] = {
    {TK_CONFIG_BORDER, "-activebackground", "activeBackground", "Foreground",
	DEF_SCROLLBAR_ACTIVE_BG_COLOR, Tk_Offset(TkScrollbar, activeBorder),
	TK_CONFIG_COLOR_ONLY},
    {TK_CONFIG_BORDER, "-activebackground", "activeBackground", "Foreground",
	DEF_SCROLLBAR_ACTIVE_BG_MONO, Tk_Offset(TkScrollbar, activeBorder),
	TK_CONFIG_MONO_ONLY},
    {TK_CONFIG_RELIEF, "-activerelief", "activeRelief", "Relief",
	DEF_SCROLLBAR_ACTIVE_RELIEF, Tk_Offset(TkScrollbar, activeRelief), 0},
    {TK_CONFIG_BORDER, "-background", "background", "Background",
	DEF_SCROLLBAR_BG_COLOR, Tk_Offset(TkScrollbar, bgBorder),
	TK_CONFIG_COLOR_ONLY},
    {TK_CONFIG_BORDER, "-background", "background", "Background",
	DEF_SCROLLBAR_BG_MONO, Tk_Offset(TkScrollbar, bgBorder),
	TK_CONFIG_MONO_ONLY},
    {TK_CONFIG_SYNONYM, "-bd", "borderWidth", (char *) NULL,
	(char *) NULL, 0, 0},
    {TK_CONFIG_SYNONYM, "-bg", "background", (char *) NULL,
	(char *) NULL, 0, 0},
    {TK_CONFIG_PIXELS, "-borderwidth", "borderWidth", "BorderWidth",
	DEF_SCROLLBAR_BORDER_WIDTH, Tk_Offset(TkScrollbar, borderWidth), 0},
    {TK_CONFIG_STRING, "-command", "command", "Command",
	DEF_SCROLLBAR_COMMAND, Tk_Offset(TkScrollbar, command),
	TK_CONFIG_NULL_OK},
    {TK_CONFIG_ACTIVE_CURSOR, "-cursor", "cursor", "Cursor",
	DEF_SCROLLBAR_CURSOR, Tk_Offset(TkScrollbar, cursor), TK_CONFIG_NULL_OK},
    {TK_CONFIG_PIXELS, "-elementborderwidth", "elementBorderWidth",
	"BorderWidth", DEF_SCROLLBAR_EL_BORDER_WIDTH,
	Tk_Offset(TkScrollbar, elementBorderWidth), 0},
    {TK_CONFIG_COLOR, "-highlightbackground", "highlightBackground",
	"HighlightBackground", DEF_SCROLLBAR_HIGHLIGHT_BG,
	Tk_Offset(TkScrollbar, highlightBgColorPtr), 0},
    {TK_CONFIG_COLOR, "-highlightcolor", "highlightColor", "HighlightColor",
	DEF_SCROLLBAR_HIGHLIGHT,
	Tk_Offset(TkScrollbar, highlightColorPtr), 0},
    {TK_CONFIG_PIXELS, "-highlightthickness", "highlightThickness",
	"HighlightThickness",
	DEF_SCROLLBAR_HIGHLIGHT_WIDTH, Tk_Offset(TkScrollbar, highlightWidth), 0},
    {TK_CONFIG_BOOLEAN, "-jump", "jump", "Jump",
	DEF_SCROLLBAR_JUMP, Tk_Offset(TkScrollbar, jump), 0},
    {TK_CONFIG_UID, "-orient", "orient", "Orient",
	DEF_SCROLLBAR_ORIENT, Tk_Offset(TkScrollbar, orientUid), 0},
    {TK_CONFIG_RELIEF, "-relief", "relief", "Relief",
	DEF_SCROLLBAR_RELIEF, Tk_Offset(TkScrollbar, relief), 0},
    {TK_CONFIG_INT, "-repeatdelay", "repeatDelay", "RepeatDelay",
	DEF_SCROLLBAR_REPEAT_DELAY, Tk_Offset(TkScrollbar, repeatDelay), 0},
    {TK_CONFIG_INT, "-repeatinterval", "repeatInterval", "RepeatInterval",
	DEF_SCROLLBAR_REPEAT_INTERVAL, Tk_Offset(TkScrollbar, repeatInterval), 0},
    {TK_CONFIG_STRING, "-takefocus", "takeFocus", "TakeFocus",
	DEF_SCROLLBAR_TAKE_FOCUS, Tk_Offset(TkScrollbar, takeFocus),
	TK_CONFIG_NULL_OK},
    {TK_CONFIG_COLOR, "-troughcolor", "troughColor", "Background",
	DEF_SCROLLBAR_TROUGH_COLOR, Tk_Offset(TkScrollbar, troughColorPtr),
	TK_CONFIG_COLOR_ONLY},
    {TK_CONFIG_COLOR, "-troughcolor", "troughColor", "Background",
	DEF_SCROLLBAR_TROUGH_MONO, Tk_Offset(TkScrollbar, troughColorPtr),
	TK_CONFIG_MONO_ONLY},
    {TK_CONFIG_PIXELS, "-width", "width", "Width",
	DEF_SCROLLBAR_WIDTH, Tk_Offset(TkScrollbar, width), 0},
    {TK_CONFIG_END, (char *) NULL, (char *) NULL, (char *) NULL,
	(char *) NULL, 0, 0}
};

/*
 * Forward declarations for procedures defined later in this file:
 */

static int		ConfigureScrollbar _ANSI_ARGS_((Tcl_Interp *interp,
			    TkScrollbar *scrollPtr, int argc, char **argv,
			    int flags));
static void		ScrollbarCmdDeletedProc _ANSI_ARGS_((
			    ClientData clientData));
static int		ScrollbarWidgetCmd _ANSI_ARGS_((ClientData clientData,
			    Tcl_Interp *, int argc, char **argv));

/*
 *--------------------------------------------------------------
 *
 * Tk_ScrollbarCmd --
 *
 *	This procedure is invoked to process the "scrollbar" Tcl
 *	command.  See the user documentation for details on what
 *	it does.
 *
 * Results:
 *	A standard Tcl result.
 *
 * Side effects:
 *	See the user documentation.
 *
 *--------------------------------------------------------------
 */

int
Tk_ScrollbarCmd(clientData, interp, argc, argv)
    ClientData clientData;	/* Main window associated with
				 * interpreter. */
    Tcl_Interp *interp;		/* Current interpreter. */
    int argc;			/* Number of arguments. */
    char **argv;		/* Argument strings. */
{
    Tk_Window tkwin = (Tk_Window) clientData;
    register TkScrollbar *scrollPtr;
    Tk_Window new;

    if (argc < 2) {
	Tcl_AppendResult(interp, "wrong # args: should be \"",
		argv[0], " pathName ?options?\"", (char *) NULL);
	return TCL_ERROR;
    }

    new = Tk_CreateWindowFromPath(interp, tkwin, argv[1], (char *) NULL);
    if (new == NULL) {
	return TCL_ERROR;
    }

    Tk_SetClass(new, "Scrollbar");
    scrollPtr = TkpCreateScrollbar(new);

    TkSetClassProcs(new, &tkpScrollbarProcs, (ClientData) scrollPtr);

    /*
     * Initialize fields that won't be initialized by ConfigureScrollbar,
     * or which ConfigureScrollbar expects to have reasonable values
     * (e.g. resource pointers).
     */

    scrollPtr->tkwin = new;
    scrollPtr->display = Tk_Display(new);
    scrollPtr->interp = interp;
    scrollPtr->widgetCmd = Tcl_CreateCommand(interp,
	    Tk_PathName(scrollPtr->tkwin), ScrollbarWidgetCmd,
	    (ClientData) scrollPtr, ScrollbarCmdDeletedProc);
    scrollPtr->orientUid = NULL;
    scrollPtr->vertical = 0;
    scrollPtr->width = 0;
    scrollPtr->command = NULL;
    scrollPtr->commandSize = 0;
    scrollPtr->repeatDelay = 0;
    scrollPtr->repeatInterval = 0;
    scrollPtr->borderWidth = 0;
    scrollPtr->bgBorder = NULL;
    scrollPtr->activeBorder = NULL;
    scrollPtr->troughColorPtr = NULL;
    scrollPtr->relief = TK_RELIEF_FLAT;
    scrollPtr->highlightWidth = 0;
    scrollPtr->highlightBgColorPtr = NULL;
    scrollPtr->highlightColorPtr = NULL;
    scrollPtr->inset = 0;
    scrollPtr->elementBorderWidth = -1;
    scrollPtr->arrowLength = 0;
    scrollPtr->sliderFirst = 0;
    scrollPtr->sliderLast = 0;
    scrollPtr->activeField = 0;
    scrollPtr->activeRelief = TK_RELIEF_RAISED;
    scrollPtr->totalUnits = 0;
    scrollPtr->windowUnits = 0;
    scrollPtr->firstUnit = 0;
    scrollPtr->lastUnit = 0;
    scrollPtr->firstFraction = 0.0;
    scrollPtr->lastFraction = 0.0;
    scrollPtr->cursor = None;
    scrollPtr->takeFocus = NULL;
    scrollPtr->flags = 0;

    if (ConfigureScrollbar(interp, scrollPtr, argc-2, argv+2, 0) != TCL_OK) {
	Tk_DestroyWindow(scrollPtr->tkwin);
	return TCL_ERROR;
    }

    interp->result = Tk_PathName(scrollPtr->tkwin);
    return TCL_OK;
}

/*
 *--------------------------------------------------------------
 *
 * ScrollbarWidgetCmd --
 *
 *	This procedure is invoked to process the Tcl command
 *	that corresponds to a widget managed by this module.
 *	See the user documentation for details on what it does.
 *
 * Results:
 *	A standard Tcl result.
 *
 * Side effects:
 *	See the user documentation.
 *
 *--------------------------------------------------------------
 */

static int
ScrollbarWidgetCmd(clientData, interp, argc, argv)
    ClientData clientData;	/* Information about scrollbar
					 * widget. */
    Tcl_Interp *interp;			/* Current interpreter. */
    int argc;				/* Number of arguments. */
    char **argv;			/* Argument strings. */
{
    register TkScrollbar *scrollPtr = (TkScrollbar *) clientData;
    int result = TCL_OK;
    size_t length;
    int c;

    if (argc < 2) {
	Tcl_AppendResult(interp, "wrong # args: should be \"",
		argv[0], " option ?arg arg ...?\"", (char *) NULL);
	return TCL_ERROR;
    }
    Tcl_Preserve((ClientData) scrollPtr);
    c = argv[1][0];
    length = strlen(argv[1]);
    if ((c == 'a') && (strncmp(argv[1], "activate", length) == 0)) {
	int oldActiveField;
	if (argc == 2) {
	    switch (scrollPtr->activeField) {
		case TOP_ARROW:		interp->result = "arrow1";	break;
		case SLIDER:		interp->result = "slider";	break;
		case BOTTOM_ARROW:	interp->result = "arrow2";	break;
	    }
	    goto done;
	}
	if (argc != 3) {
	    Tcl_AppendResult(interp, "wrong # args: should be \"",
		    argv[0], " activate element\"", (char *) NULL);
	    goto error;
	}
	c = argv[2][0];
	length = strlen(argv[2]);
	oldActiveField = scrollPtr->activeField;
	if ((c == 'a') && (strcmp(argv[2], "arrow1") == 0)) {
	    scrollPtr->activeField = TOP_ARROW;
	} else if ((c == 'a') && (strcmp(argv[2], "arrow2") == 0)) {
	    scrollPtr->activeField = BOTTOM_ARROW;
	} else if ((c == 's') && (strncmp(argv[2], "slider", length) == 0)) {
	    scrollPtr->activeField = SLIDER;
	} else {
	    scrollPtr->activeField = OUTSIDE;
	}
	if (oldActiveField != scrollPtr->activeField) {
	    TkScrollbarEventuallyRedraw(scrollPtr);
	}
    } else if ((c == 'c') && (strncmp(argv[1], "cget", length) == 0)
	    && (length >= 2)) {
	if (argc != 3) {
	    Tcl_AppendResult(interp, "wrong # args: should be \"",
		    argv[0], " cget option\"",
		    (char *) NULL);
	    goto error;
	}
	result = Tk_ConfigureValue(interp, scrollPtr->tkwin,
		tkpScrollbarConfigSpecs, (char *) scrollPtr, argv[2], 0);
    } else if ((c == 'c') && (strncmp(argv[1], "configure", length) == 0)
	    && (length >= 2)) {
	if (argc == 2) {
	    result = Tk_ConfigureInfo(interp, scrollPtr->tkwin,
		    tkpScrollbarConfigSpecs, (char *) scrollPtr,
		    (char *) NULL, 0);
	} else if (argc == 3) {
	    result = Tk_ConfigureInfo(interp, scrollPtr->tkwin,
		    tkpScrollbarConfigSpecs, (char *) scrollPtr, argv[2], 0);
	} else {
	    result = ConfigureScrollbar(interp, scrollPtr, argc-2, argv+2,
		    TK_CONFIG_ARGV_ONLY);
	}
    } else if ((c == 'd') && (strncmp(argv[1], "delta", length) == 0)) {
	int xDelta, yDelta, pixels, length;
	double fraction;

	if (argc != 4) {
	    Tcl_AppendResult(interp, "wrong # args: should be \"",
		    argv[0], " delta xDelta yDelta\"", (char *) NULL);
	    goto error;
	}
	if ((Tcl_GetInt(interp, argv[2], &xDelta) != TCL_OK)
		|| (Tcl_GetInt(interp, argv[3], &yDelta) != TCL_OK)) {
	    goto error;
	}
	if (scrollPtr->vertical) {
	    pixels = yDelta;
	    length = Tk_Height(scrollPtr->tkwin) - 1
		    - 2*(scrollPtr->arrowLength + scrollPtr->inset);
	} else {
	    pixels = xDelta;
	    length = Tk_Width(scrollPtr->tkwin) - 1
		    - 2*(scrollPtr->arrowLength + scrollPtr->inset);
	}
	if (length == 0) {
	    fraction = 0.0;
	} else {
	    fraction = ((double) pixels / (double) length);
	}
	sprintf(interp->result, "%g", fraction);
    } else if ((c == 'f') && (strncmp(argv[1], "fraction", length) == 0)) {
	int x, y, pos, length;
	double fraction;

	if (argc != 4) {
	    Tcl_AppendResult(interp, "wrong # args: should be \"",
		    argv[0], " fraction x y\"", (char *) NULL);
	    goto error;
	}
	if ((Tcl_GetInt(interp, argv[2], &x) != TCL_OK)
		|| (Tcl_GetInt(interp, argv[3], &y) != TCL_OK)) {
	    goto error;
	}
	if (scrollPtr->vertical) {
	    pos = y - (scrollPtr->arrowLength + scrollPtr->inset);
	    length = Tk_Height(scrollPtr->tkwin) - 1
		    - 2*(scrollPtr->arrowLength + scrollPtr->inset);
	} else {
	    pos = x - (scrollPtr->arrowLength + scrollPtr->inset);
	    length = Tk_Width(scrollPtr->tkwin) - 1
		    - 2*(scrollPtr->arrowLength + scrollPtr->inset);
	}
	if (length == 0) {
	    fraction = 0.0;
	} else {
	    fraction = ((double) pos / (double) length);
	}