tkmessage.c

linux系统下的音频通信

    if (msgPtr->textVarName != NULL) {
	Tcl_UntraceVar(interp, msgPtr->textVarName, 
		TCL_GLOBAL_ONLY|TCL_TRACE_WRITES|TCL_TRACE_UNSETS,
		MessageTextVarProc, (ClientData) msgPtr);
    }

    if (Tk_ConfigureWidget(interp, msgPtr->tkwin, configSpecs,
	    argc, argv, (char *) msgPtr, flags) != TCL_OK) {
	return TCL_ERROR;
    }
    
    /*
     * If the message is to display the value of a variable, then set up
     * a trace on the variable's value, create the variable if it doesn't
     * exist, and fetch its current value.
     */

    if (msgPtr->textVarName != NULL) {
	char *value;

	value = Tcl_GetVar(interp, msgPtr->textVarName, TCL_GLOBAL_ONLY);
	if (value == NULL) {
	    Tcl_SetVar(interp, msgPtr->textVarName, msgPtr->string,
		    TCL_GLOBAL_ONLY);
	} else {
	    if (msgPtr->string != NULL) {
		ckfree(msgPtr->string);
	    }
	    msgPtr->string = strcpy(ckalloc(strlen(value) + 1), value);
	}
	Tcl_TraceVar(interp, msgPtr->textVarName,
		TCL_GLOBAL_ONLY|TCL_TRACE_WRITES|TCL_TRACE_UNSETS,
		MessageTextVarProc, (ClientData) msgPtr);
    }

    /*
     * A few other options need special processing, such as setting
     * the background from a 3-D border or handling special defaults
     * that couldn't be specified to Tk_ConfigureWidget.
     */

    msgPtr->numChars = strlen(msgPtr->string);

    Tk_SetBackgroundFromBorder(msgPtr->tkwin, msgPtr->border);

    if (msgPtr->highlightWidth < 0) {
	msgPtr->highlightWidth = 0;
    }

    MessageWorldChanged((ClientData) msgPtr);
    return TCL_OK;
}

/*
 *---------------------------------------------------------------------------
 *
 * MessageWorldChanged --
 *
 *      This procedure is called when the world has changed in some
 *      way and the widget needs to recompute all its graphics contexts
 *	and determine its new geometry.
 *
 * Results:
 *      None.
 *
 * Side effects:
 *      Message will be relayed out and redisplayed.
 *
 *---------------------------------------------------------------------------
 */
 
static void
MessageWorldChanged(instanceData)
    ClientData instanceData;	/* Information about widget. */
{
    XGCValues gcValues;
    GC gc;
    Tk_FontMetrics fm;
    Message *msgPtr;

    msgPtr = (Message *) instanceData;

    gcValues.font = Tk_FontId(msgPtr->tkfont);
    gcValues.foreground = msgPtr->fgColorPtr->pixel;
    gc = Tk_GetGC(msgPtr->tkwin, GCForeground | GCFont, &gcValues);
    if (msgPtr->textGC != None) {
	Tk_FreeGC(msgPtr->display, msgPtr->textGC);
    }
    msgPtr->textGC = gc;

    Tk_GetFontMetrics(msgPtr->tkfont, &fm);
    if (msgPtr->padX < 0) {
	msgPtr->padX = fm.ascent / 2;
    }
    if (msgPtr->padY == -1) {
	msgPtr->padY = fm.ascent / 4;
    }

    /*
     * Recompute the desired geometry for the window, and arrange for
     * the window to be redisplayed.
     */

    ComputeMessageGeometry(msgPtr);
    if ((msgPtr->tkwin != NULL) && Tk_IsMapped(msgPtr->tkwin)
	    && !(msgPtr->flags & REDRAW_PENDING)) {
	Tcl_DoWhenIdle(DisplayMessage, (ClientData) msgPtr);
	msgPtr->flags |= REDRAW_PENDING;
    }
}

/*
 *--------------------------------------------------------------
 *
 * ComputeMessageGeometry --
 *
 *	Compute the desired geometry for a message window,
 *	taking into account the desired aspect ratio for the
 *	window.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	Tk_GeometryRequest is called to inform the geometry
 *	manager of the desired geometry for this window.
 *
 *--------------------------------------------------------------
 */

static void
ComputeMessageGeometry(msgPtr)
    register Message *msgPtr;	/* Information about window. */
{
    int width, inc, height;
    int thisWidth, thisHeight, maxWidth;
    int aspect, lowerBound, upperBound, inset;

    Tk_FreeTextLayout(msgPtr->textLayout);

    inset = msgPtr->borderWidth + msgPtr->highlightWidth;

    /*
     * Compute acceptable bounds for the final aspect ratio.
     */

    aspect = msgPtr->aspect/10;
    if (aspect < 5) {
	aspect = 5;
    }
    lowerBound = msgPtr->aspect - aspect;
    upperBound = msgPtr->aspect + aspect;

    /*
     * Do the computation in multiple passes:  start off with
     * a very wide window, and compute its height.  Then change
     * the width and try again.  Reduce the size of the change
     * and iterate until dimensions are found that approximate
     * the desired aspect ratio.  Or, if the user gave an explicit
     * width then just use that.
     */

    if (msgPtr->width > 0) {
	width = msgPtr->width;
	inc = 0;
    } else {
	width = WidthOfScreen(Tk_Screen(msgPtr->tkwin))/2;
	inc = width/2;
    }

    for ( ; ; inc /= 2) {
	msgPtr->textLayout = Tk_ComputeTextLayout(msgPtr->tkfont,
		msgPtr->string, msgPtr->numChars, width, msgPtr->justify,
		0, &thisWidth, &thisHeight);
	maxWidth = thisWidth + 2 * (inset + msgPtr->padX);
	height = thisHeight + 2 * (inset + msgPtr->padY);

	if (inc <= 2) {
	    break;
	}
	aspect = (100 * maxWidth) / height;

	if (aspect < lowerBound) {
	    width += inc;
	} else if (aspect > upperBound) {
	    width -= inc;
	} else {
	    break;
	}
	Tk_FreeTextLayout(msgPtr->textLayout);
    }
    msgPtr->msgWidth = thisWidth;
    msgPtr->msgHeight = thisHeight;
    Tk_GeometryRequest(msgPtr->tkwin, maxWidth, height);
    Tk_SetInternalBorder(msgPtr->tkwin, inset);
}

/*
 *--------------------------------------------------------------
 *
 * DisplayMessage --
 *
 *	This procedure redraws the contents of a message window.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	Information appears on the screen.
 *
 *--------------------------------------------------------------
 */

static void
DisplayMessage(clientData)
    ClientData clientData;	/* Information about window. */
{
    register Message *msgPtr = (Message *) clientData;
    register Tk_Window tkwin = msgPtr->tkwin;
    int x, y;

    msgPtr->flags &= ~REDRAW_PENDING;
    if ((msgPtr->tkwin == NULL) || !Tk_IsMapped(tkwin)) {
	return;
    }
    Tk_Fill3DRectangle(tkwin, Tk_WindowId(tkwin), msgPtr->border, 0, 0,
	    Tk_Width(tkwin), Tk_Height(tkwin), 0, TK_RELIEF_FLAT);

    /*
     * Compute starting y-location for message based on message size
     * and anchor option.
     */

    TkComputeAnchor(msgPtr->anchor, tkwin, msgPtr->padX, msgPtr->padY,
	    msgPtr->msgWidth, msgPtr->msgHeight, &x, &y);
    Tk_DrawTextLayout(Tk_Display(tkwin), Tk_WindowId(tkwin), msgPtr->textGC,
	    msgPtr->textLayout, x, y, 0, -1);

    if (msgPtr->relief != TK_RELIEF_FLAT) {
	Tk_Draw3DRectangle(tkwin, Tk_WindowId(tkwin), msgPtr->border,
		msgPtr->highlightWidth, msgPtr->highlightWidth,
		Tk_Width(tkwin) - 2*msgPtr->highlightWidth,
		Tk_Height(tkwin) - 2*msgPtr->highlightWidth,
		msgPtr->borderWidth, msgPtr->relief);
    }
    if (msgPtr->highlightWidth != 0) {
	GC gc;

	if (msgPtr->flags & GOT_FOCUS) {
	    gc = Tk_GCForColor(msgPtr->highlightColorPtr, Tk_WindowId(tkwin));
	} else {
	    gc = Tk_GCForColor(msgPtr->highlightBgColorPtr, Tk_WindowId(tkwin));
	}
	Tk_DrawFocusHighlight(tkwin, gc, msgPtr->highlightWidth,
		Tk_WindowId(tkwin));
    }
}

/*
 *--------------------------------------------------------------
 *
 * MessageEventProc --
 *
 *	This procedure is invoked by the Tk dispatcher for various
 *	events on messages.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	When the window gets deleted, internal structures get
 *	cleaned up.  When it gets exposed, it is redisplayed.
 *
 *--------------------------------------------------------------
 */

static void
MessageEventProc(clientData, eventPtr)
    ClientData clientData;	/* Information about window. */
    XEvent *eventPtr;		/* Information about event. */
{
    Message *msgPtr = (Message *) clientData;

    if (((eventPtr->type == Expose) && (eventPtr->xexpose.count == 0))
	    || (eventPtr->type == ConfigureNotify)) {
	goto redraw;
    } else if (eventPtr->type == DestroyNotify) {
	if (msgPtr->tkwin != NULL) {
	    msgPtr->tkwin = NULL;
	    Tcl_DeleteCommandFromToken(msgPtr->interp, msgPtr->widgetCmd);
	}
	if (msgPtr->flags & REDRAW_PENDING) {
	    Tcl_CancelIdleCall(DisplayMessage, (ClientData) msgPtr);
	}
	Tcl_EventuallyFree((ClientData) msgPtr, DestroyMessage);
    } else if (eventPtr->type == FocusIn) {
	if (eventPtr->xfocus.detail != NotifyInferior) {
	    msgPtr->flags |= GOT_FOCUS;
	    if (msgPtr->highlightWidth > 0) {
		goto redraw;
	    }
	}
    } else if (eventPtr->type == FocusOut) {
	if (eventPtr->xfocus.detail != NotifyInferior) {
	    msgPtr->flags &= ~GOT_FOCUS;
	    if (msgPtr->highlightWidth > 0) {
		goto redraw;
	    }
	}
    }
    return;

    redraw:
    if ((msgPtr->tkwin != NULL) && !(msgPtr->flags & REDRAW_PENDING)) {
	Tcl_DoWhenIdle(DisplayMessage, (ClientData) msgPtr);
	msgPtr->flags |= REDRAW_PENDING;
    }
}

/*
 *----------------------------------------------------------------------
 *
 * MessageCmdDeletedProc --
 *
 *	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
MessageCmdDeletedProc(clientData)
    ClientData clientData;	/* Pointer to widget record for widget. */
{
    Message *msgPtr = (Message *) clientData;
    Tk_Window tkwin = msgPtr->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) {
	msgPtr->tkwin = NULL;
	Tk_DestroyWindow(tkwin);
    }
}

/*
 *--------------------------------------------------------------
 *
 * MessageTextVarProc --
 *
 *	This procedure is invoked when someone changes the variable
 *	whose contents are to be displayed in a message.
 *
 * Results:
 *	NULL is always returned.
 *
 * Side effects:
 *	The text displayed in the message will change to match the
 *	variable.
 *
 *--------------------------------------------------------------
 */

	/* ARGSUSED */
static char *
MessageTextVarProc(clientData, interp, name1, name2, flags)
    ClientData clientData;	/* Information about message. */
    Tcl_Interp *interp;		/* Interpreter containing variable. */
    char *name1;		/* Name of variable. */
    char *name2;		/* Second part of variable name. */
    int flags;			/* Information about what happened. */
{
    register Message *msgPtr = (Message *) clientData;
    char *value;

    /*
     * If the variable is unset, then immediately recreate it unless
     * the whole interpreter is going away.
     */

    if (flags & TCL_TRACE_UNSETS) {
	if ((flags & TCL_TRACE_DESTROYED) && !(flags & TCL_INTERP_DESTROYED)) {
	    Tcl_SetVar(interp, msgPtr->textVarName, msgPtr->string,
		    TCL_GLOBAL_ONLY);
	    Tcl_TraceVar(interp, msgPtr->textVarName,
		    TCL_GLOBAL_ONLY|TCL_TRACE_WRITES|TCL_TRACE_UNSETS,
		    MessageTextVarProc, clientData);
	}
	return (char *) NULL;
    }

    value = Tcl_GetVar(interp, msgPtr->textVarName, TCL_GLOBAL_ONLY);
    if (value == NULL) {
	value = "";
    }
    if (msgPtr->string != NULL) {
	ckfree(msgPtr->string);
    }
    msgPtr->numChars = strlen(value);
    msgPtr->string = (char *) ckalloc((unsigned) (msgPtr->numChars + 1));
    strcpy(msgPtr->string, value);
    ComputeMessageGeometry(msgPtr);

    if ((msgPtr->tkwin != NULL) && Tk_IsMapped(msgPtr->tkwin)
	    && !(msgPtr->flags & REDRAW_PENDING)) {
	Tcl_DoWhenIdle(DisplayMessage, (ClientData) msgPtr);
	msgPtr->flags |= REDRAW_PENDING;
    }
    return (char *) NULL;
}