tkscrollbar.c

linux系统下的音频通信

	if (fraction < 0) {
	    fraction = 0;
	} else if (fraction > 1.0) {
	    fraction = 1.0;
	}
	sprintf(interp->result, "%g", fraction);
    } else if ((c == 'g') && (strncmp(argv[1], "get", length) == 0)) {
	if (argc != 2) {
	    Tcl_AppendResult(interp, "wrong # args: should be \"",
		    argv[0], " get\"", (char *) NULL);
	    goto error;
	}
	if (scrollPtr->flags & NEW_STYLE_COMMANDS) {
	    char first[TCL_DOUBLE_SPACE], last[TCL_DOUBLE_SPACE];

	    Tcl_PrintDouble(interp, scrollPtr->firstFraction, first);
	    Tcl_PrintDouble(interp, scrollPtr->lastFraction, last);
	    Tcl_AppendResult(interp, first, " ", last, (char *) NULL);
	} else {
	    sprintf(interp->result, "%d %d %d %d", scrollPtr->totalUnits,
		    scrollPtr->windowUnits, scrollPtr->firstUnit,
		    scrollPtr->lastUnit);
	}
    } else if ((c == 'i') && (strncmp(argv[1], "identify", length) == 0)) {
	int x, y, thing;

	if (argc != 4) {
	    Tcl_AppendResult(interp, "wrong # args: should be \"",
		    argv[0], " identify 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;
	}
	thing = TkpScrollbarPosition(scrollPtr, x,y);
	switch (thing) {
	    case TOP_ARROW:	interp->result = "arrow1";	break;
	    case TOP_GAP:	interp->result = "trough1";	break;
	    case SLIDER:	interp->result = "slider";	break;
	    case BOTTOM_GAP:	interp->result = "trough2";	break;
	    case BOTTOM_ARROW:	interp->result = "arrow2";	break;
	}
    } else if ((c == 's') && (strncmp(argv[1], "set", length) == 0)) {
	int totalUnits, windowUnits, firstUnit, lastUnit;

	if (argc == 4) {
	    double first, last;

	    if (Tcl_GetDouble(interp, argv[2], &first) != TCL_OK) {
		goto error;
	    }
	    if (Tcl_GetDouble(interp, argv[3], &last) != TCL_OK) {
		goto error;
	    }
	    if (first < 0) {
		scrollPtr->firstFraction = 0;
	    } else if (first > 1.0) {
		scrollPtr->firstFraction = 1.0;
	    } else {
		scrollPtr->firstFraction = first;
	    }
	    if (last < scrollPtr->firstFraction) {
		scrollPtr->lastFraction = scrollPtr->firstFraction;
	    } else if (last > 1.0) {
		scrollPtr->lastFraction = 1.0;
	    } else {
		scrollPtr->lastFraction = last;
	    }
	    scrollPtr->flags |= NEW_STYLE_COMMANDS;
	} else if (argc == 6) {
	    if (Tcl_GetInt(interp, argv[2], &totalUnits) != TCL_OK) {
		goto error;
	    }
	    if (totalUnits < 0) {
		totalUnits = 0;
	    }
	    if (Tcl_GetInt(interp, argv[3], &windowUnits) != TCL_OK) {
		goto error;
	    }
	    if (windowUnits < 0) {
		windowUnits = 0;
	    }
	    if (Tcl_GetInt(interp, argv[4], &firstUnit) != TCL_OK) {
		goto error;
	    }
	    if (Tcl_GetInt(interp, argv[5], &lastUnit) != TCL_OK) {
		goto error;
	    }
	    if (totalUnits > 0) {
		if (lastUnit < firstUnit) {
		    lastUnit = firstUnit;
		}
	    } else {
		firstUnit = lastUnit = 0;
	    }
	    scrollPtr->totalUnits = totalUnits;
	    scrollPtr->windowUnits = windowUnits;
	    scrollPtr->firstUnit = firstUnit;
	    scrollPtr->lastUnit = lastUnit;
	    if (scrollPtr->totalUnits == 0) {
		scrollPtr->firstFraction = 0.0;
		scrollPtr->lastFraction = 1.0;
	    } else {
		scrollPtr->firstFraction = ((double) firstUnit)/totalUnits;
		scrollPtr->lastFraction = ((double) (lastUnit+1))/totalUnits;
	    }
	    scrollPtr->flags &= ~NEW_STYLE_COMMANDS;
	} else {
	    Tcl_AppendResult(interp, "wrong # args: should be \"",
		    argv[0], " set firstFraction lastFraction\" or \"",
		    argv[0],
		    " set totalUnits windowUnits firstUnit lastUnit\"",
		    (char *) NULL);
	    goto error;
	}
	TkpComputeScrollbarGeometry(scrollPtr);
	TkScrollbarEventuallyRedraw(scrollPtr);
    } else {
	Tcl_AppendResult(interp, "bad option \"", argv[1],
		"\": must be activate, cget, configure, delta, fraction, ",
		"get, identify, or set", (char *) NULL);
	goto error;
    }
    done:
    Tcl_Release((ClientData) scrollPtr);
    return result;

    error:
    Tcl_Release((ClientData) scrollPtr);
    return TCL_ERROR;
}

/*
 *----------------------------------------------------------------------
 *
 * ConfigureScrollbar --
 *
 *	This procedure is called to process an argv/argc list, plus
 *	the Tk option database, in order to configure (or
 *	reconfigure) a scrollbar widget.
 *
 * Results:
 *	The return value is a standard Tcl result.  If TCL_ERROR is
 *	returned, then interp->result contains an error message.
 *
 * Side effects:
 *	Configuration information, such as colors, border width,
 *	etc. get set for scrollPtr;  old resources get freed,
 *	if there were any.
 *
 *----------------------------------------------------------------------
 */

static int
ConfigureScrollbar(interp, scrollPtr, argc, argv, flags)
    Tcl_Interp *interp;			/* Used for error reporting. */
    register TkScrollbar *scrollPtr;	/* Information about widget;  may or
					 * may not already have values for
					 * some fields. */
    int argc;				/* Number of valid entries in argv. */
    char **argv;			/* Arguments. */
    int flags;				/* Flags to pass to
					 * Tk_ConfigureWidget. */
{
    size_t length;

    if (Tk_ConfigureWidget(interp, scrollPtr->tkwin, tkpScrollbarConfigSpecs,
	    argc, argv, (char *) scrollPtr, flags) != TCL_OK) {
	return TCL_ERROR;
    }

    /*
     * A few options need special processing, such as parsing the
     * orientation or setting the background from a 3-D border.
     */

    length = strlen(scrollPtr->orientUid);
    if (strncmp(scrollPtr->orientUid, "vertical", length) == 0) {
	scrollPtr->vertical = 1;
    } else if (strncmp(scrollPtr->orientUid, "horizontal", length) == 0) {
	scrollPtr->vertical = 0;
    } else {
	Tcl_AppendResult(interp, "bad orientation \"", scrollPtr->orientUid,
		"\": must be vertical or horizontal", (char *) NULL);
	return TCL_ERROR;
    }

    if (scrollPtr->command != NULL) {
	scrollPtr->commandSize = strlen(scrollPtr->command);
    } else {
	scrollPtr->commandSize = 0;
    }

    /*
     * Configure platform specific options.
     */

    TkpConfigureScrollbar(scrollPtr);

    /*
     * Register the desired geometry for the window (leave enough space
     * for the two arrows plus a minimum-size slider, plus border around
     * the whole window, if any).  Then arrange for the window to be
     * redisplayed.
     */

    TkpComputeScrollbarGeometry(scrollPtr);
    TkScrollbarEventuallyRedraw(scrollPtr);
    return TCL_OK;
}

/*
 *--------------------------------------------------------------
 *
 * TkScrollbarEventProc --
 *
 *	This procedure is invoked by the Tk dispatcher for various
 *	events on scrollbars.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	When the window gets deleted, internal structures get
 *	cleaned up.  When it gets exposed, it is redisplayed.
 *
 *--------------------------------------------------------------
 */

void
TkScrollbarEventProc(clientData, eventPtr)
    ClientData clientData;	/* Information about window. */
    XEvent *eventPtr;		/* Information about event. */
{
    TkScrollbar *scrollPtr = (TkScrollbar *) clientData;

    if ((eventPtr->type == Expose) && (eventPtr->xexpose.count == 0)) {
	TkScrollbarEventuallyRedraw(scrollPtr);
    } else if (eventPtr->type == DestroyNotify) {
	TkpDestroyScrollbar(scrollPtr);
	if (scrollPtr->tkwin != NULL) {
	    scrollPtr->tkwin = NULL;
	    Tcl_DeleteCommandFromToken(scrollPtr->interp,
                    scrollPtr->widgetCmd);
	}
	if (scrollPtr->flags & REDRAW_PENDING) {
	    Tcl_CancelIdleCall(TkpDisplayScrollbar, (ClientData) scrollPtr);
	}
	/*
	 * Free up all the stuff that requires special handling, then
	 * let Tk_FreeOptions handle all the standard option-related
	 * stuff.
	 */
	
	Tk_FreeOptions(tkpScrollbarConfigSpecs, (char *) scrollPtr,
		scrollPtr->display, 0);
	Tcl_EventuallyFree((ClientData) scrollPtr, TCL_DYNAMIC);
    } else if (eventPtr->type == ConfigureNotify) {
	TkpComputeScrollbarGeometry(scrollPtr);
	TkScrollbarEventuallyRedraw(scrollPtr);
    } else if (eventPtr->type == FocusIn) {
	if (eventPtr->xfocus.detail != NotifyInferior) {
	    scrollPtr->flags |= GOT_FOCUS;
	    if (scrollPtr->highlightWidth > 0) {
		TkScrollbarEventuallyRedraw(scrollPtr);
	    }
	}
    } else if (eventPtr->type == FocusOut) {
	if (eventPtr->xfocus.detail != NotifyInferior) {
	    scrollPtr->flags &= ~GOT_FOCUS;
	    if (scrollPtr->highlightWidth > 0) {
		TkScrollbarEventuallyRedraw(scrollPtr);
	    }
	}
    }
}

/*
 *----------------------------------------------------------------------
 *
 * ScrollbarCmdDeletedProc --
 *
 *	This procedure is invoked when a widget command is deleted.  If
 *	the widget isn't already in the process of being destroyed,
 *	this command destroys it.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	The widget is destroyed.
 *
 *----------------------------------------------------------------------
 */

static void
ScrollbarCmdDeletedProc(clientData)
    ClientData clientData;	/* Pointer to widget record for widget. */
{
    TkScrollbar *scrollPtr = (TkScrollbar *) clientData;
    Tk_Window tkwin = scrollPtr->tkwin;

    /*
     * This procedure could be invoked either because the window was
     * destroyed and the command was then deleted (in which case tkwin
     * is NULL) or because the command was deleted, and then this procedure
     * destroys the widget.
     */

    if (tkwin != NULL) {
	scrollPtr->tkwin = NULL;
	Tk_DestroyWindow(tkwin);
    }
}

/*
 *--------------------------------------------------------------
 *
 * TkScrollbarEventuallyRedraw --
 *
 *	Arrange for one or more of the fields of a scrollbar
 *	to be redrawn.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	None.
 *
 *--------------------------------------------------------------
 */

void
TkScrollbarEventuallyRedraw(scrollPtr)
    register TkScrollbar *scrollPtr;	/* Information about widget. */
{
    if ((scrollPtr->tkwin == NULL) || (!Tk_IsMapped(scrollPtr->tkwin))) {
	return;
    }
    if ((scrollPtr->flags & REDRAW_PENDING) == 0) {
	Tcl_DoWhenIdle(TkpDisplayScrollbar, (ClientData) scrollPtr);
	scrollPtr->flags |= REDRAW_PENDING;
    }
}