tkcanvwind.c

linux系统下的音频通信

	winItemPtr->header.y2 = winItemPtr->header.y1 + 1;
	return;
    }

    /*
     * Compute dimensions of window.
     */

    width = winItemPtr->width;
    if (width <= 0) {
	width = Tk_ReqWidth(winItemPtr->tkwin);
	if (width <= 0) {
	    width = 1;
	}
    }
    height = winItemPtr->height;
    if (height <= 0) {
	height = Tk_ReqHeight(winItemPtr->tkwin);
	if (height <= 0) {
	    height = 1;
	}
    }

    /*
     * Compute location of window, using anchor information.
     */

    switch (winItemPtr->anchor) {
	case TK_ANCHOR_N:
	    x -= width/2;
	    break;
	case TK_ANCHOR_NE:
	    x -= width;
	    break;
	case TK_ANCHOR_E:
	    x -= width;
	    y -= height/2;
	    break;
	case TK_ANCHOR_SE:
	    x -= width;
	    y -= height;
	    break;
	case TK_ANCHOR_S:
	    x -= width/2;
	    y -= height;
	    break;
	case TK_ANCHOR_SW:
	    y -= height;
	    break;
	case TK_ANCHOR_W:
	    y -= height/2;
	    break;
	case TK_ANCHOR_NW:
	    break;
	case TK_ANCHOR_CENTER:
	    x -= width/2;
	    y -= height/2;
	    break;
    }

    /*
     * Store the information in the item header.
     */

    winItemPtr->header.x1 = x;
    winItemPtr->header.y1 = y;
    winItemPtr->header.x2 = x + width;
    winItemPtr->header.y2 = y + height;
}

/*
 *--------------------------------------------------------------
 *
 * DisplayWinItem --
 *
 *	This procedure is invoked to "draw" a window item in a given
 *	drawable.  Since the window draws itself, we needn't do any
 *	actual redisplay here.  However, this procedure takes care
 *	of actually repositioning the child window so that it occupies
 *	the correct screen position.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	The child window's position may get changed.  Note: this
 *	procedure gets called both when a window needs to be displayed
 *	and when it ceases to be visible on the screen (e.g. it was
 *	scrolled or moved off-screen or the enclosing canvas is
 *	unmapped).
 *
 *--------------------------------------------------------------
 */

static void
DisplayWinItem(canvas, itemPtr, display, drawable, regionX, regionY,
	regionWidth, regionHeight)
    Tk_Canvas canvas;			/* Canvas that contains item. */
    Tk_Item *itemPtr;			/* Item to be displayed. */
    Display *display;			/* Display on which to draw item. */
    Drawable drawable;			/* Pixmap or window in which to draw
					 * item. */
    int regionX, regionY, regionWidth, regionHeight;
					/* Describes region of canvas that
					 * must be redisplayed (not used). */
{
    WindowItem *winItemPtr = (WindowItem *) itemPtr;
    int width, height;
    short x, y;
    Tk_Window canvasTkwin = Tk_CanvasTkwin(canvas);

    if (winItemPtr->tkwin == NULL) {
	return;
    }

    Tk_CanvasWindowCoords(canvas, (double) winItemPtr->header.x1,
	    (double) winItemPtr->header.y1, &x, &y);
    width = winItemPtr->header.x2 - winItemPtr->header.x1;
    height = winItemPtr->header.y2 - winItemPtr->header.y1;

    /*
     * If the window is completely out of the visible area of the canvas
     * then unmap it.  This code used not to be present (why unmap the
     * window if it isn't visible anyway?) but this could cause the
     * window to suddenly reappear if the canvas window got resized.
     */

    if (((x + width) <= 0) || ((y + height) <= 0)
	    || (x >= Tk_Width(canvasTkwin)) || (y >= Tk_Height(canvasTkwin))) {
	if (canvasTkwin == Tk_Parent(winItemPtr->tkwin)) {
	    Tk_UnmapWindow(winItemPtr->tkwin); 
	} else {
	    Tk_UnmaintainGeometry(winItemPtr->tkwin, canvasTkwin);
	}
	return;
    }

    /*
     * Reposition and map the window (but in different ways depending
     * on whether the canvas is the window's parent).
     */

    if (canvasTkwin == Tk_Parent(winItemPtr->tkwin)) {
	if ((x != Tk_X(winItemPtr->tkwin)) || (y != Tk_Y(winItemPtr->tkwin))
		|| (width != Tk_Width(winItemPtr->tkwin))
		|| (height != Tk_Height(winItemPtr->tkwin))) {
	    Tk_MoveResizeWindow(winItemPtr->tkwin, x, y, width, height);
	}
	Tk_MapWindow(winItemPtr->tkwin);
    } else {
	Tk_MaintainGeometry(winItemPtr->tkwin, canvasTkwin, x, y,
		width, height);
    }
}

/*
 *--------------------------------------------------------------
 *
 * WinItemToPoint --
 *
 *	Computes the distance from a given point to a given
 *	rectangle, in canvas units.
 *
 * Results:
 *	The return value is 0 if the point whose x and y coordinates
 *	are coordPtr[0] and coordPtr[1] is inside the window.  If the
 *	point isn't inside the window then the return value is the
 *	distance from the point to the window.
 *
 * Side effects:
 *	None.
 *
 *--------------------------------------------------------------
 */

static double
WinItemToPoint(canvas, itemPtr, pointPtr)
    Tk_Canvas canvas;		/* Canvas containing item. */
    Tk_Item *itemPtr;		/* Item to check against point. */
    double *pointPtr;		/* Pointer to x and y coordinates. */
{
    WindowItem *winItemPtr = (WindowItem *) itemPtr;
    double x1, x2, y1, y2, xDiff, yDiff;

    x1 = winItemPtr->header.x1;
    y1 = winItemPtr->header.y1;
    x2 = winItemPtr->header.x2;
    y2 = winItemPtr->header.y2;

    /*
     * Point is outside rectangle.
     */

    if (pointPtr[0] < x1) {
	xDiff = x1 - pointPtr[0];
    } else if (pointPtr[0] >= x2)  {
	xDiff = pointPtr[0] + 1 - x2;
    } else {
	xDiff = 0;
    }

    if (pointPtr[1] < y1) {
	yDiff = y1 - pointPtr[1];
    } else if (pointPtr[1] >= y2)  {
	yDiff = pointPtr[1] + 1 - y2;
    } else {
	yDiff = 0;
    }

    return hypot(xDiff, yDiff);
}

/*
 *--------------------------------------------------------------
 *
 * WinItemToArea --
 *
 *	This procedure is called to determine whether an item
 *	lies entirely inside, entirely outside, or overlapping
 *	a given rectangle.
 *
 * Results:
 *	-1 is returned if the item is entirely outside the area
 *	given by rectPtr, 0 if it overlaps, and 1 if it is entirely
 *	inside the given area.
 *
 * Side effects:
 *	None.
 *
 *--------------------------------------------------------------
 */

static int
WinItemToArea(canvas, itemPtr, rectPtr)
    Tk_Canvas canvas;		/* Canvas containing item. */
    Tk_Item *itemPtr;		/* Item to check against rectangle. */
    double *rectPtr;		/* Pointer to array of four coordinates
				 * (x1, y1, x2, y2) describing rectangular
				 * area.  */
{
    WindowItem *winItemPtr = (WindowItem *) itemPtr;

    if ((rectPtr[2] <= winItemPtr->header.x1)
	    || (rectPtr[0] >= winItemPtr->header.x2)
	    || (rectPtr[3] <= winItemPtr->header.y1)
	    || (rectPtr[1] >= winItemPtr->header.y2)) {
	return -1;
    }
    if ((rectPtr[0] <= winItemPtr->header.x1)
	    && (rectPtr[1] <= winItemPtr->header.y1)
	    && (rectPtr[2] >= winItemPtr->header.x2)
	    && (rectPtr[3] >= winItemPtr->header.y2)) {
	return 1;
    }
    return 0;
}

/*
 *--------------------------------------------------------------
 *
 * ScaleWinItem --
 *
 *	This procedure is invoked to rescale a rectangle or oval
 *	item.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	The rectangle or oval referred to by itemPtr is rescaled
 *	so that the following transformation is applied to all
 *	point coordinates:
 *		x' = originX + scaleX*(x-originX)
 *		y' = originY + scaleY*(y-originY)
 *
 *--------------------------------------------------------------
 */

static void
ScaleWinItem(canvas, itemPtr, originX, originY, scaleX, scaleY)
    Tk_Canvas canvas;			/* Canvas containing rectangle. */
    Tk_Item *itemPtr;			/* Rectangle to be scaled. */
    double originX, originY;		/* Origin about which to scale rect. */
    double scaleX;			/* Amount to scale in X direction. */
    double scaleY;			/* Amount to scale in Y direction. */
{
    WindowItem *winItemPtr = (WindowItem *) itemPtr;

    winItemPtr->x = originX + scaleX*(winItemPtr->x - originX);
    winItemPtr->y = originY + scaleY*(winItemPtr->y - originY);
    if (winItemPtr->width > 0) {
	winItemPtr->width = (int) (scaleX*winItemPtr->width);
    }
    if (winItemPtr->height > 0) {
	winItemPtr->height = (int) (scaleY*winItemPtr->height);
    }
    ComputeWindowBbox(canvas, winItemPtr);
}

/*
 *--------------------------------------------------------------
 *
 * TranslateWinItem --
 *
 *	This procedure is called to move a rectangle or oval by a
 *	given amount.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	The position of the rectangle or oval is offset by
 *	(xDelta, yDelta), and the bounding box is updated in the
 *	generic part of the item structure.
 *
 *--------------------------------------------------------------
 */

static void
TranslateWinItem(canvas, itemPtr, deltaX, deltaY)
    Tk_Canvas canvas;			/* Canvas containing item. */
    Tk_Item *itemPtr;			/* Item that is being moved. */
    double deltaX, deltaY;		/* Amount by which item is to be
					 * moved. */
{
    WindowItem *winItemPtr = (WindowItem *) itemPtr;

    winItemPtr->x += deltaX;
    winItemPtr->y += deltaY;
    ComputeWindowBbox(canvas, winItemPtr);
}

/*
 *--------------------------------------------------------------
 *
 * WinItemStructureProc --
 *
 *	This procedure is invoked whenever StructureNotify events
 *	occur for a window that's managed as part of a canvas window
 *	item.  This procudure's only purpose is to clean up when
 *	windows are deleted.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	The window is disassociated from the window item when it is
 *	deleted.
 *
 *--------------------------------------------------------------
 */

static void
WinItemStructureProc(clientData, eventPtr)
    ClientData clientData;	/* Pointer to record describing window item. */
    XEvent *eventPtr;		/* Describes what just happened. */
{
    WindowItem *winItemPtr = (WindowItem *) clientData;

    if (eventPtr->type == DestroyNotify) {
	winItemPtr->tkwin = NULL;
    }
}

/*
 *--------------------------------------------------------------
 *
 * WinItemRequestProc --
 *
 *	This procedure is invoked whenever a window that's associated
 *	with a window canvas item changes its requested dimensions.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	The size and location on the screen of the window may change,
 *	depending on the options specified for the window item.
 *
 *--------------------------------------------------------------
 */

static void
WinItemRequestProc(clientData, tkwin)
    ClientData clientData;		/* Pointer to record for window item. */
    Tk_Window tkwin;			/* Window that changed its desired
					 * size. */
{
    WindowItem *winItemPtr = (WindowItem *) clientData;

    ComputeWindowBbox(winItemPtr->canvas, winItemPtr);
    DisplayWinItem(winItemPtr->canvas, (Tk_Item *) winItemPtr,
	    (Display *) NULL, (Drawable) None, 0, 0, 0, 0);
}

/*
 *--------------------------------------------------------------
 *
 * WinItemLostSlaveProc --
 *
 *	This procedure is invoked by Tk whenever some other geometry
 *	claims control over a slave that used to be managed by us.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	Forgets all canvas-related information about the slave.
 *
 *--------------------------------------------------------------
 */

	/* ARGSUSED */
static void
WinItemLostSlaveProc(clientData, tkwin)
    ClientData clientData;	/* WindowItem structure for slave window that
				 * was stolen away. */
    Tk_Window tkwin;		/* Tk's handle for the slave window. */
{
    WindowItem *winItemPtr = (WindowItem *) clientData;
    Tk_Window canvasTkwin = Tk_CanvasTkwin(winItemPtr->canvas);

    Tk_DeleteEventHandler(winItemPtr->tkwin, StructureNotifyMask,
	    WinItemStructureProc, (ClientData) winItemPtr);
    if (canvasTkwin != Tk_Parent(winItemPtr->tkwin)) {
	Tk_UnmaintainGeometry(winItemPtr->tkwin, canvasTkwin);
    }
    Tk_UnmapWindow(winItemPtr->tkwin);
    winItemPtr->tkwin = NULL;
}