tksquare.c

linux系统下的音频通信

 * SquareConfigure --
 *
 *	This procedure is called to process an argv/argc list in
 *	conjunction with the Tk option database to configure (or
 *	reconfigure) a square 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 squarePtr;  old resources get freed,
 *	if there were any.
 *
 *----------------------------------------------------------------------
 */

static int
SquareConfigure(interp, squarePtr, argc, argv, flags)
    Tcl_Interp *interp;			/* Used for error reporting. */
    Square *squarePtr;			/* Information about widget. */
    int argc;				/* Number of valid entries in argv. */
    char **argv;			/* Arguments. */
    int flags;				/* Flags to pass to
					 * Tk_ConfigureWidget. */
{
    if (Tk_ConfigureWidget(interp, squarePtr->tkwin, configSpecs,
	    argc, argv, (char *) squarePtr, flags) != TCL_OK) {
	return TCL_ERROR;
    }

    /*
     * Set the background for the window and create a graphics context
     * for use during redisplay.
     */

    Tk_SetWindowBackground(squarePtr->tkwin,
	    Tk_3DBorderColor(squarePtr->bgBorder)->pixel);
    if ((squarePtr->gc == None) && (squarePtr->doubleBuffer)) {
	XGCValues gcValues;
	gcValues.function = GXcopy;
	gcValues.graphics_exposures = False;
	squarePtr->gc = Tk_GetGC(squarePtr->tkwin,
		GCFunction|GCGraphicsExposures, &gcValues);
    }

    /*
     * Register the desired geometry for the window.  Then arrange for
     * the window to be redisplayed.
     */

    Tk_GeometryRequest(squarePtr->tkwin, 200, 150);
    Tk_SetInternalBorder(squarePtr->tkwin, squarePtr->borderWidth);
    if (!squarePtr->updatePending) {
	Tcl_DoWhenIdle(SquareDisplay, (ClientData) squarePtr);
	squarePtr->updatePending = 1;
    }
    return TCL_OK;
}

/*
 *--------------------------------------------------------------
 *
 * SquareEventProc --
 *
 *	This procedure is invoked by the Tk dispatcher for various
 *	events on squares.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	When the window gets deleted, internal structures get
 *	cleaned up.  When it gets exposed, it is redisplayed.
 *
 *--------------------------------------------------------------
 */

static void
SquareEventProc(clientData, eventPtr)
    ClientData clientData;	/* Information about window. */
    XEvent *eventPtr;		/* Information about event. */
{
    Square *squarePtr = (Square *) clientData;

    if (eventPtr->type == Expose) {
	if (!squarePtr->updatePending) {
	    Tcl_DoWhenIdle(SquareDisplay, (ClientData) squarePtr);
	    squarePtr->updatePending = 1;
	}
    } else if (eventPtr->type == ConfigureNotify) {
	KeepInWindow(squarePtr);
	if (!squarePtr->updatePending) {
	    Tcl_DoWhenIdle(SquareDisplay, (ClientData) squarePtr);
	    squarePtr->updatePending = 1;
	}
    } else if (eventPtr->type == DestroyNotify) {
	if (squarePtr->tkwin != NULL) {
	    squarePtr->tkwin = NULL;
	    Tcl_DeleteCommandFromToken(squarePtr->interp,
		    squarePtr->widgetCmd);
	}
	if (squarePtr->updatePending) {
	    Tcl_CancelIdleCall(SquareDisplay, (ClientData) squarePtr);
	}
	Tcl_EventuallyFree((ClientData) squarePtr, SquareDestroy);
    }
}

/*
 *----------------------------------------------------------------------
 *
 * SquareCmdDeletedProc --
 *
 *	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
SquareCmdDeletedProc(clientData)
    ClientData clientData;	/* Pointer to widget record for widget. */
{
    Square *squarePtr = (Square *) clientData;
    Tk_Window tkwin = squarePtr->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) {
	squarePtr->tkwin = NULL;
	Tk_DestroyWindow(tkwin);
    }
}

/*
 *--------------------------------------------------------------
 *
 * SquareDisplay --
 *
 *	This procedure redraws the contents of a square window.
 *	It is invoked as a do-when-idle handler, so it only runs
 *	when there's nothing else for the application to do.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	Information appears on the screen.
 *
 *--------------------------------------------------------------
 */

static void
SquareDisplay(clientData)
    ClientData clientData;	/* Information about window. */
{
    Square *squarePtr = (Square *) clientData;
    Tk_Window tkwin = squarePtr->tkwin;
    Pixmap pm = None;
    Drawable d;

    squarePtr->updatePending = 0;
    if (!Tk_IsMapped(tkwin)) {
	return;
    }

    /*
     * Create a pixmap for double-buffering, if necessary.
     */

    if (squarePtr->doubleBuffer) {
	pm = Tk_GetPixmap(Tk_Display(tkwin), Tk_WindowId(tkwin),
		Tk_Width(tkwin), Tk_Height(tkwin),
		DefaultDepthOfScreen(Tk_Screen(tkwin)));
	d = pm;
    } else {
	d = Tk_WindowId(tkwin);
    }

    /*
     * Redraw the widget's background and border.
     */

    Tk_Fill3DRectangle(tkwin, d, squarePtr->bgBorder, 0, 0, Tk_Width(tkwin),
	    Tk_Height(tkwin), squarePtr->borderWidth, squarePtr->relief);

    /*
     * Display the square.
     */

    Tk_Fill3DRectangle(tkwin, d, squarePtr->fgBorder, squarePtr->x,
	    squarePtr->y, squarePtr->size, squarePtr->size,
	    squarePtr->borderWidth, TK_RELIEF_RAISED);

    /*
     * If double-buffered, copy to the screen and release the pixmap.
     */

    if (squarePtr->doubleBuffer) {
	XCopyArea(Tk_Display(tkwin), pm, Tk_WindowId(tkwin), squarePtr->gc,
		0, 0, (unsigned) Tk_Width(tkwin), (unsigned) Tk_Height(tkwin),
		0, 0);
	Tk_FreePixmap(Tk_Display(tkwin), pm);
    }
}

/*
 *----------------------------------------------------------------------
 *
 * SquareDestroy --
 *
 *	This procedure is invoked by Tcl_EventuallyFree or Tcl_Release
 *	to clean up the internal structure of a square at a safe time
 *	(when no-one is using it anymore).
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	Everything associated with the square is freed up.
 *
 *----------------------------------------------------------------------
 */

static void
SquareDestroy(memPtr)
    char *memPtr;		/* Info about square widget. */
{
    Square *squarePtr = (Square *) memPtr;

    Tk_FreeOptions(configSpecs, (char *) squarePtr, squarePtr->display, 0);
    if (squarePtr->gc != None) {
	Tk_FreeGC(squarePtr->display, squarePtr->gc);
    }
    ckfree((char *) squarePtr);
}

/*
 *----------------------------------------------------------------------
 *
 * KeepInWindow --
 *
 *	Adjust the position of the square if necessary to keep it in
 *	the widget's window.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	The x and y position of the square are adjusted if necessary
 *	to keep the square in the window.
 *
 *----------------------------------------------------------------------
 */

static void
KeepInWindow(squarePtr)
    register Square *squarePtr;		/* Pointer to widget record. */
{
    int i, bd;
    bd = 0;
    if (squarePtr->relief != TK_RELIEF_FLAT) {
	bd = squarePtr->borderWidth;
    }
    i = (Tk_Width(squarePtr->tkwin) - bd) - (squarePtr->x + squarePtr->size);
    if (i < 0) {
	squarePtr->x += i;
    }
    i = (Tk_Height(squarePtr->tkwin) - bd) - (squarePtr->y + squarePtr->size);
    if (i < 0) {
	squarePtr->y += i;
    }
    if (squarePtr->x < bd) {
	squarePtr->x = bd;
    }
    if (squarePtr->y < bd) {
	squarePtr->y = bd;
    }
}