Tk Source Code

    Tcl_Obj *padXObj;		/* Additional padding requested for pane, in
				 * the x dimension. */
    Tcl_Obj *padYObj;		/* Additional padding requested for pane, in
				 * the y dimension. */
    Tcl_Obj *widthObj, *heightObj;
				/* Tcl_Obj rep's of pane width/height, to
				 * allow for null values. */


    int sticky;			/* Sticky string. */
    int x, y;			/* Coordinates of the widget. */
    int paneWidth, paneHeight;	/* Pane dimensions (may be different from
				 * pane width/height). */
    int sashx, sashy;		/* Coordinates of the sash of the right or
				 * bottom of this pane. */
    int markx, marky;		/* Coordinates of the last mark set for the
				 * sash. */
    int handlex, handley;	/* Coordinates of the sash handle. */
    enum stretch stretch;	/* Controls how pane grows/shrinks */
    int hide;			/* Controls visibility of pane */
    struct PanedWindow *containerPtr;
				/* Paned window managing the window. */
    Tk_Window after;		/* Placeholder for parsing options. */
    Tk_Window before;		/* Placeholder for parsing options. */
#ifdef BUILD_tk
    int width;			/* Pane width. */
    int height;			/* Pane height. */
#endif
} Pane;

/*
 * A data structure of the following type is kept for each paned window widget
 * managed by this file:
 */

typedef struct PanedWindow {
    Tk_Window tkwin;		/* Window that embodies the paned window. */
    Tk_Window proxywin;		/* Window for the resizing proxy. */
    Display *display;		/* X's token for the window's display. */
    Tcl_Interp *interp;		/* Interpreter associated with widget. */
    Tcl_Command widgetCmd;	/* Token for square's widget command. */
    Tk_OptionTable optionTable;	/* Token representing the configuration
				 * specifications. */
    Tk_OptionTable paneOpts;	/* Token for pane cget table. */
    Tk_3DBorder background;	/* Background color. */
    Tcl_Obj *borderWidthObj;
    int relief;			/* 3D border effect (TK_RELIEF_RAISED, etc) */
    Tcl_Obj *widthObj;		/* Tcl_Obj rep for width. */
    Tcl_Obj *heightObj;		/* Tcl_Obj rep for height. */

    enum orient orient;		/* Orientation of the widget. */
    Tk_Cursor cursor;		/* Current cursor for window, or None. */
    int resizeOpaque;		/* Boolean indicating whether resize should be
				 * opaque or rubberband style. */
    int sashRelief;		/* Relief used to draw sash. */

    Tcl_Obj *sashWidthObj;	/* Tcl_Obj rep for sash width. */

    Tcl_Obj *sashPadObj;	/* Tcl_Obj rep for sash padding. */
    int showHandle;		/* Boolean indicating whether sash handles
				 * should be drawn. */
    Tcl_Obj *handleSizeObj;	/* Size of one side of a sash handle (handles
				 * are square), in pixels. */
    Tcl_Obj *handlePadObj;	/* Distance from border to draw handle. */

    Tk_Cursor sashCursor;	/* Cursor used when mouse is above a sash. */
    GC gc;			/* Graphics context for copying from
				 * off-screen pixmap onto screen. */
    int proxyx, proxyy;		/* Proxy x,y coordinates. */
    Tk_3DBorder proxyBackground;/* Background color used to draw proxy. If NULL, use background. */
    Tcl_Obj *proxyBorderWidthObj; /* Tcl_Obj rep for proxyBorderWidth */

    int proxyRelief;		/* Relief used to draw proxy, if TK_RELIEF_NULL then use relief. */
    Pane **panes;		/* Pointer to array of Panes. */
    int numPanes;		/* Number of panes. */
    int sizeofPanes;		/* Number of elements in the panes array. */
    int flags;			/* Flags for widget; see below. */
#ifdef BUILD_tk
    int width, height;		/* Width and height of the widget. */
#endif
} PanedWindow;

/*
 * Flags used for paned windows:
 *
 * REDRAW_PENDING:		Non-zero means a DoWhenIdle handler has been
 *				queued to redraw this window.

	DEF_PANEDWINDOW_BG_COLOR, TCL_INDEX_NONE, offsetof(PanedWindow, background), 0,
	DEF_PANEDWINDOW_BG_MONO, 0},
    {TK_OPTION_SYNONYM, "-bd", NULL, NULL,
	NULL, 0, TCL_INDEX_NONE, 0, "-borderwidth", 0},
    {TK_OPTION_SYNONYM, "-bg", NULL, NULL,
	NULL, 0, TCL_INDEX_NONE, 0, "-background", 0},
    {TK_OPTION_PIXELS, "-borderwidth", "borderWidth", "BorderWidth",
	DEF_PANEDWINDOW_BORDERWIDTH, offsetof(PanedWindow, borderWidthObj), TCL_INDEX_NONE,
	0, 0, GEOMETRY},
    {TK_OPTION_CURSOR, "-cursor", "cursor", "Cursor",
	DEF_PANEDWINDOW_CURSOR, TCL_INDEX_NONE, offsetof(PanedWindow, cursor),
	TK_OPTION_NULL_OK, 0, 0},
    {TK_OPTION_PIXELS, "-handlepad", "handlePad", "HandlePad",
	DEF_PANEDWINDOW_HANDLEPAD, offsetof(PanedWindow, handlePadObj), TCL_INDEX_NONE,
	0, 0, GEOMETRY},
    {TK_OPTION_PIXELS, "-handlesize", "handleSize", "HandleSize",
	DEF_PANEDWINDOW_HANDLESIZE, offsetof(PanedWindow, handleSizeObj),
	TCL_INDEX_NONE, 0, 0, GEOMETRY},
    {TK_OPTION_PIXELS, "-height", "height", "Height",
	DEF_PANEDWINDOW_HEIGHT, offsetof(PanedWindow, heightObj),
	offsetof(PanedWindow, height), TK_OPTION_NULL_OK, 0, GEOMETRY},
    {TK_OPTION_BOOLEAN, "-opaqueresize", "opaqueResize", "OpaqueResize",
	DEF_PANEDWINDOW_OPAQUERESIZE, TCL_INDEX_NONE,
	offsetof(PanedWindow, resizeOpaque), 0, 0, 0},
    {TK_OPTION_STRING_TABLE, "-orient", "orient", "Orient",
	DEF_PANEDWINDOW_ORIENT, TCL_INDEX_NONE, offsetof(PanedWindow, orient),
	TK_OPTION_ENUM_VAR, orientStrings, GEOMETRY},
    {TK_OPTION_BORDER, "-proxybackground", "proxyBackground", "ProxyBackground",
	0, TCL_INDEX_NONE, offsetof(PanedWindow, proxyBackground), TK_OPTION_NULL_OK,
	(void *)DEF_PANEDWINDOW_BG_MONO, 0},
    {TK_OPTION_PIXELS, "-proxyborderwidth", "proxyBorderWidth", "ProxyBorderWidth",
	DEF_PANEDWINDOW_PROXYBORDER, offsetof(PanedWindow, proxyBorderWidthObj),
	TCL_INDEX_NONE, 0, 0, GEOMETRY},
    {TK_OPTION_RELIEF, "-proxyrelief", "proxyRelief", "Relief",
	0, TCL_INDEX_NONE, offsetof(PanedWindow, proxyRelief),
	TK_OPTION_NULL_OK, 0, 0},
    {TK_OPTION_RELIEF, "-relief", "relief", "Relief",
	DEF_PANEDWINDOW_RELIEF, TCL_INDEX_NONE, offsetof(PanedWindow, relief), 0, 0, 0},
    {TK_OPTION_CURSOR, "-sashcursor", "sashCursor", "Cursor",
	DEF_PANEDWINDOW_SASHCURSOR, TCL_INDEX_NONE, offsetof(PanedWindow, sashCursor),
	TK_OPTION_NULL_OK, 0, 0},
    {TK_OPTION_PIXELS, "-sashpad", "sashPad", "SashPad",
	DEF_PANEDWINDOW_SASHPAD, offsetof(PanedWindow, sashPadObj), TCL_INDEX_NONE,
	0, 0, GEOMETRY},
    {TK_OPTION_RELIEF, "-sashrelief", "sashRelief", "Relief",
	DEF_PANEDWINDOW_SASHRELIEF, TCL_INDEX_NONE, offsetof(PanedWindow, sashRelief),
	0, 0, 0},
    {TK_OPTION_PIXELS, "-sashwidth", "sashWidth", "Width",
	DEF_PANEDWINDOW_SASHWIDTH, offsetof(PanedWindow, sashWidthObj),
	TCL_INDEX_NONE, 0, 0, GEOMETRY},
    {TK_OPTION_BOOLEAN, "-showhandle", "showHandle", "ShowHandle",
	DEF_PANEDWINDOW_SHOWHANDLE, TCL_INDEX_NONE, offsetof(PanedWindow, showHandle),
	0, 0, GEOMETRY},
    {TK_OPTION_PIXELS, "-width", "width", "Width",
	DEF_PANEDWINDOW_WIDTH, offsetof(PanedWindow, widthObj),
	offsetof(PanedWindow, width), TK_OPTION_NULL_OK, 0, GEOMETRY},
    {TK_OPTION_END, NULL, NULL, NULL, NULL, 0, 0, 0, 0, 0}

	TK_OPTION_NULL_OK, 0, 0},
    {TK_OPTION_PIXELS, "-height", NULL, NULL,
	DEF_PANEDWINDOW_PANE_HEIGHT, offsetof(Pane, heightObj),
	offsetof(Pane, height), TK_OPTION_NULL_OK, 0, 0},
    {TK_OPTION_BOOLEAN, "-hide", "hide", "Hide",
	DEF_PANEDWINDOW_PANE_HIDE, TCL_INDEX_NONE, offsetof(Pane, hide), 0,0,GEOMETRY},
    {TK_OPTION_PIXELS, "-minsize", NULL, NULL,
	DEF_PANEDWINDOW_PANE_MINSIZE, offsetof(Pane, minSizeObj), TCL_INDEX_NONE, 0, 0, 0},
    {TK_OPTION_PIXELS, "-padx", NULL, NULL,
	DEF_PANEDWINDOW_PANE_PADX, offsetof(Pane, padXObj), TCL_INDEX_NONE, 0, 0, 0},
    {TK_OPTION_PIXELS, "-pady", NULL, NULL,
	DEF_PANEDWINDOW_PANE_PADY, offsetof(Pane, padYObj), TCL_INDEX_NONE, 0, 0, 0},
    {TK_OPTION_CUSTOM, "-sticky", NULL, NULL,
	DEF_PANEDWINDOW_PANE_STICKY, TCL_INDEX_NONE, offsetof(Pane, sticky),
	0, &stickyOption, 0},
    {TK_OPTION_STRING_TABLE, "-stretch", "stretch", "Stretch",
	DEF_PANEDWINDOW_PANE_STRETCH, TCL_INDEX_NONE, offsetof(Pane, stretch),
	TK_OPTION_ENUM_VAR, stretchStrings, 0},
    {TK_OPTION_PIXELS, "-width", NULL, NULL,

	tkwin = Tk_NameToWindow(interp, Tcl_GetString(objv[i + 2]),
		pwPtr->tkwin);

	found = 0;
	for (j = 0; j < pwPtr->numPanes; j++) {
	    if (pwPtr->panes[j] != NULL && pwPtr->panes[j]->tkwin == tkwin) {
		int minSize;
		Tk_SetOptions(interp, pwPtr->panes[j],
			pwPtr->paneOpts, objc - firstOptionArg,
			objv + firstOptionArg, pwPtr->tkwin, NULL, NULL);
		Tk_GetPixelsFromObj(NULL, tkwin, pwPtr->panes[j]->minSizeObj, &minSize);
		if (minSize < 0) {
		    Tcl_DecrRefCount(pwPtr->panes[j]->minSizeObj);
		    pwPtr->panes[j]->minSizeObj = Tcl_NewIntObj(0);
		    Tcl_IncrRefCount(pwPtr->panes[j]->minSizeObj);
		}
		found = 1;

		/*
		 * If the pane is supposed to move, add it to the inserts
		 * array now; otherwise, leave it where it is.
		 */

	    continue;
	}

	/*
	 * Create a new pane structure and initialize it. All panes start
	 * out with their "natural" dimensions.
	 */
	int minSize;

	panePtr = (Pane *)ckalloc(sizeof(Pane));
	memset(panePtr, 0, sizeof(Pane));
	Tk_InitOptions(interp, panePtr, pwPtr->paneOpts,
		pwPtr->tkwin);
	Tk_SetOptions(interp, panePtr, pwPtr->paneOpts,
		objc - firstOptionArg, objv + firstOptionArg,

	    panePtr->paneWidth = Tk_ReqWidth(tkwin) + doubleBw;
	}
	if (panePtr->height > 0) {
	    panePtr->paneHeight = panePtr->height;
	} else {
	    panePtr->paneHeight = Tk_ReqHeight(tkwin) + doubleBw;
	}
	Tk_GetPixelsFromObj(NULL, panePtr->tkwin, panePtr->minSizeObj, &minSize);
	if (minSize < 0) {
	    Tcl_DecrRefCount(panePtr->minSizeObj);
	    panePtr->minSizeObj = Tcl_NewIntObj(0);
	    Tcl_IncrRefCount(panePtr->minSizeObj);
	}

	/*
	 * Set up the geometry management callbacks for this pane.
	 */

	Tk_CreateEventHandler(panePtr->tkwin, StructureNotifyMask,

static void
PanedWindowWorldChanged(
    void *instanceData)	/* Information about the paned window. */
{
    XGCValues gcValues;
    GC newGC;
    PanedWindow *pwPtr = (PanedWindow *)instanceData;
    int borderWidth;

    /*
     * Allocated a graphics context for drawing the paned window widget
     * elements (background, sashes, etc.) and set the window background.
     */

    gcValues.background = Tk_3DBorderColor(pwPtr->background)->pixel;
    newGC = Tk_GetGC(pwPtr->tkwin, GCBackground, &gcValues);
    if (pwPtr->gc != NULL) {
	Tk_FreeGC(pwPtr->display, pwPtr->gc);
    }
    pwPtr->gc = newGC;
    Tk_SetWindowBackground(pwPtr->tkwin, gcValues.background);

    /*
     * Issue geometry size requests to Tk.
     */

    Tk_GetPixelsFromObj(NULL, pwPtr->tkwin, pwPtr->borderWidthObj, &borderWidth);
    Tk_SetInternalBorder(pwPtr->tkwin, borderWidth);
    if (pwPtr->width > 0 && pwPtr->height > 0) {
	Tk_GeometryRequest(pwPtr->tkwin, pwPtr->width, pwPtr->height);
    }

    /*
     * Arrange for the window to be redrawn, if neccessary.
     */

    PanedWindow *pwPtr = (PanedWindow *)clientData;
    Pane *panePtr;
    Pixmap pixmap;
    Tk_Window tkwin = pwPtr->tkwin;
    int i, sashWidth, sashHeight;
    const int horizontal = (pwPtr->orient == ORIENT_HORIZONTAL);
    int first, last;
    int borderWidth;

    pwPtr->flags &= ~REDRAW_PENDING;
    if ((pwPtr->tkwin == NULL) || !Tk_IsMapped(tkwin)) {
	return;
    }

    if (pwPtr->flags & REQUESTED_RELAYOUT) {

    pixmap = Tk_WindowId(tkwin);
#endif /* TK_NO_DOUBLE_BUFFERING */

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

    Tk_GetPixelsFromObj(NULL, tkwin, pwPtr->borderWidthObj, &borderWidth);
    Tk_Fill3DRectangle(tkwin, pixmap, pwPtr->background, 0, 0,
	    Tk_Width(tkwin), Tk_Height(tkwin), borderWidth,
	    pwPtr->relief);

    /*
     * Set up boilerplate geometry values for sashes (width, height, common
     * coordinates).
     */

    Tk_GetPixelsFromObj(NULL, tkwin, pwPtr->sashWidthObj, &sashWidth);
	if (horizontal) {
	sashHeight = Tk_Height(tkwin) - (2 * Tk_InternalBorderLeft(tkwin));

    } else {
	sashHeight = sashWidth;
	sashWidth = Tk_Width(tkwin) - (2 * Tk_InternalBorderLeft(tkwin));

    }

    /*
     * Draw the sashes.
     */

    GetFirstLastVisiblePane(pwPtr, &first, &last);
    for (i = 0; i < pwPtr->numPanes - 1; i++) {

	panePtr = pwPtr->panes[i];
	if (panePtr->hide || i == last) {
	    continue;
	}
	if (sashWidth > 0 && sashHeight > 0) {
	    Tk_Fill3DRectangle(tkwin, pixmap, pwPtr->background,
		    panePtr->sashx, panePtr->sashy, sashWidth, sashHeight,
		    1, pwPtr->sashRelief);
	}
	if (pwPtr->showHandle) {
	    int handleSize;
	    Tk_GetPixelsFromObj(NULL, tkwin, pwPtr->handleSizeObj, &handleSize);
	    Tk_Fill3DRectangle(tkwin, pixmap, pwPtr->background,
		    panePtr->handlex, panePtr->handley,
		    handleSize, handleSize, 1,
		    TK_RELIEF_RAISED);
	}
    }

#ifndef TK_NO_DOUBLE_BUFFERING
    /*
     * Copy the information from the off-screen pixmap onto the screen, then

    int sashWidth, sashOffset, sashCount, handleOffset;
    int sashReserve, sxReserve, syReserve;
    int internalBW;
    int paneDynSize, paneDynMinSize, pwHeight, pwWidth, pwSize;
    int first, last;
    int stretchReserve, stretchAmount;
    const int horizontal = (pwPtr->orient == ORIENT_HORIZONTAL);
    int handleSize, sashPad, handlePad;

    pwPtr->flags &= ~(REQUESTED_RELAYOUT|RESIZE_PENDING);

    /*
     * If the parent has no panes anymore, then don't do anything at all:
     * just leave the parent's size as-is. Otherwise there is no way to
     * "relinquish" control over the parent so another geometry manager can

    stretchReserve = (horizontal ? pwWidth : pwHeight);

    /*
     * Calculate the sash width, including handle and padding, and the sash
     * and handle offsets.
     */

    Tk_GetPixelsFromObj(NULL, pwPtr->tkwin, pwPtr->sashPadObj, &sashPad);
	sashOffset = handleOffset = sashPad;
    Tk_GetPixelsFromObj(NULL, pwPtr->tkwin, pwPtr->handleSizeObj, &handleSize);
    Tk_GetPixelsFromObj(NULL, pwPtr->tkwin, pwPtr->sashWidthObj, &sashWidth);
    if (pwPtr->showHandle && handleSize > sashWidth) {

	sashOffset = ((handleSize - sashWidth) / 2) + sashPad;
	sashWidth = (2 * sashPad) + handleSize;
    } else {

	handleOffset = ((sashWidth - handleSize) / 2) + sashPad;
	sashWidth = (2 * sashPad) + sashWidth;
    }

    for (i = sashCount = 0; i < pwPtr->numPanes; i++) {
	int padX, padY, minSize;

	panePtr = pwPtr->panes[i];

	if (panePtr->hide) {
	    continue;
	}

	/*
	 * Compute the total size needed by all the panes and the left-over,
	 * or shortage of space available.
	 */

	Tk_GetPixelsFromObj(NULL, panePtr->tkwin, panePtr->padXObj, &padX);
	Tk_GetPixelsFromObj(NULL, panePtr->tkwin, panePtr->padYObj, &padY);
	if (horizontal) {
	    if (panePtr->width > 0) {
		paneSize = panePtr->width;
	    } else {
		paneSize = panePtr->paneWidth;
	    }
	    stretchReserve -= paneSize + (2 * padX);
	} else {
	    if (panePtr->height > 0) {
		paneSize = panePtr->height;
	    } else {
		paneSize = panePtr->paneHeight;
	    }
	    stretchReserve -= paneSize + (2 * padY);
	}
	Tk_GetPixelsFromObj(NULL, panePtr->tkwin, panePtr->minSizeObj, &minSize);
	if (IsStretchable(panePtr->stretch,i,first,last)
		&& Tk_IsMapped(pwPtr->tkwin)) {
	    paneDynSize += paneSize;
	    paneDynMinSize += minSize;
	}
	if (i != last) {
	    stretchReserve -= sashWidth;
	    sashCount++;
	}
    }

    /*
     * Second pass; adjust/arrange panes.
     */

    for (i = 0; i < pwPtr->numPanes; i++) {
	int padX, padY;

	panePtr = pwPtr->panes[i];

	if (panePtr->hide) {
	    Tk_UnmaintainGeometry(panePtr->tkwin, pwPtr->tkwin);
	    Tk_UnmapWindow(panePtr->tkwin);
	    continue;
	}

	 */

	doubleBw = 2 * Tk_Changes(panePtr->tkwin)->border_width;
	newPaneWidth = (panePtr->width > 0 ? panePtr->width :
		Tk_ReqWidth(panePtr->tkwin) + doubleBw);
	newPaneHeight = (panePtr->height > 0 ? panePtr->height :
		Tk_ReqHeight(panePtr->tkwin) + doubleBw);
	Tk_GetPixelsFromObj(NULL, panePtr->tkwin, panePtr->minSizeObj, &paneMinSize);

	/*
	 * Calculate pane width and height.
	 */

	if (horizontal) {
	    if (panePtr->width > 0) {

	    if (paneDynSize > 0) {
		frac = (double)paneSize / (double)paneDynSize;
	    } else {
		frac = (double)paneSize / (double)pwSize;
	    }

	    paneDynSize -= paneSize;
	    paneDynMinSize -= paneMinSize;
	    stretchAmount = (int) (frac * stretchReserve);
	    if (paneSize + stretchAmount >= paneMinSize) {
		stretchReserve -= stretchAmount;
		paneSize += stretchAmount;
	    } else {
		stretchReserve += paneSize - paneMinSize;
		paneSize = paneMinSize;

		stretchReserve += paneSize - paneMinSize;
		paneSize = paneMinSize;
	    } else {
		paneSize += paneDynSize - paneDynMinSize + stretchReserve;
		stretchReserve = paneDynMinSize - paneDynSize;
	    }
	}
	Tk_GetPixelsFromObj(NULL, panePtr->tkwin, panePtr->padXObj, &padX);
	Tk_GetPixelsFromObj(NULL, panePtr->tkwin, panePtr->padYObj, &padY);
	if (horizontal) {
	    paneWidth = paneSize;
	    paneHeight = pwHeight - (2 * padY);
	} else {
	    paneWidth = pwWidth - (2 * padX);
	    paneHeight = paneSize;
	}

	/*
	 * Adjust for area reserved for sashes.
	 */

	panePtr->y = y;

	/*
	 * Compute the location of the sash at the right or bottom of the
	 * parcel and the location of the next parcel.
	 */

	Tk_GetPixelsFromObj(NULL, pwPtr->tkwin, pwPtr->handlePadObj, &handlePad);
	if (horizontal) {
	    x += paneWidth + (2 * padX);
	    if (x < internalBW) {
		x = internalBW;
	    }
	    panePtr->sashx = x + sashOffset;
	    panePtr->sashy = y;
	    panePtr->handlex = x + handleOffset;
	    panePtr->handley = y + handlePad;
	    x += sashWidth;
	} else {
	    y += paneHeight + (2 * padY);
	    if (y < internalBW) {
		y = internalBW;
	    }
	    panePtr->sashx = x;
	    panePtr->sashy = y + sashOffset;
	    panePtr->handlex = x + handlePad;
	    panePtr->handley = y + handleOffset;
	    y += sashWidth;
	}

	/*
	 * Compute the actual dimensions of the pane in the pane.
	 */

	paneX = panePtr->x;
	paneY = panePtr->y;
	AdjustForSticky(panePtr->sticky, paneWidth, paneHeight,
		&paneX, &paneY, &newPaneWidth, &newPaneHeight);

	paneX += padX;
	paneY += padY;

	/*
	 * Now put the window in the proper spot.
	 */

	if (newPaneWidth <= 0 || newPaneHeight <= 0 ||
		(horizontal ? paneX - internalBW > pwWidth :

static void
ComputeGeometry(
    PanedWindow *pwPtr)		/* Pointer to the Paned Window structure. */
{
    int i, x, y, doubleBw, internalBw;
    int sashWidth, sashOffset, handleOffset;
    int reqWidth, reqHeight, dim, handleSize;
    Pane *panePtr;
    const int horizontal = (pwPtr->orient == ORIENT_HORIZONTAL);
    int sashPad;

    pwPtr->flags |= REQUESTED_RELAYOUT;

    x = y = internalBw = Tk_InternalBorderLeft(pwPtr->tkwin);
    reqWidth = reqHeight = 0;

    /*
     * Sashes and handles share space on the display. To simplify processing
     * below, precompute the x and y offsets of the handles and sashes within
     * the space occupied by their combination; later, just add those offsets
     * blindly (avoiding the extra showHandle, etc, checks).
     */

    Tk_GetPixelsFromObj(NULL, pwPtr->tkwin, pwPtr->sashPadObj, &sashPad);
    sashOffset = handleOffset = sashPad;
    Tk_GetPixelsFromObj(NULL, pwPtr->tkwin, pwPtr->handleSizeObj, &handleSize);
    Tk_GetPixelsFromObj(NULL, pwPtr->tkwin, pwPtr->sashWidthObj, &sashWidth);
    if (pwPtr->showHandle && handleSize > sashWidth) {

	sashOffset = ((handleSize - sashWidth) / 2) + sashPad;
	sashWidth = (2 * sashPad) + handleSize;
    } else {

	handleOffset = ((sashWidth - handleSize) / 2) + sashPad;
	sashWidth = (2 * sashPad) + sashWidth;
    }

    for (i = 0; i < pwPtr->numPanes; i++) {
	int padX, padY, minSize, handlePad;
	panePtr = pwPtr->panes[i];

	if (panePtr->hide) {
	    continue;
	}

	/*
	 * First set the coordinates for the top left corner of the pane's
	 * parcel.
	 */

	panePtr->x = x;
	panePtr->y = y;

	/*
	 * Make sure the pane's paned dimension is at least minsize. This
	 * check may be redundant, since the only way to change a pane's size
	 * is by moving a sash, and that code checks the minsize.
	 */

	Tk_GetPixelsFromObj(NULL, panePtr->tkwin, panePtr->minSizeObj, &minSize);
	if (horizontal) {
	    if (panePtr->paneWidth < minSize) {
		panePtr->paneWidth = minSize;
	    }
	} else {
	    if (panePtr->paneHeight < minSize) {
		panePtr->paneHeight = minSize;
	    }
	}

	/*
	 * Compute the location of the sash at the right or bottom of the
	 * parcel.
	 */

	Tk_GetPixelsFromObj(NULL, panePtr->tkwin, panePtr->padXObj, &padX);
	Tk_GetPixelsFromObj(NULL, panePtr->tkwin, panePtr->padYObj, &padY);
	Tk_GetPixelsFromObj(NULL, pwPtr->tkwin, pwPtr->handlePadObj, &handlePad);
	if (horizontal) {
	    x += panePtr->paneWidth + (2 * padX);
	    panePtr->sashx = x + sashOffset;
	    panePtr->sashy = y;
	    panePtr->handlex = x + handleOffset;
	    panePtr->handley = y + handlePad;
	    x += sashWidth;
	} else {
	    y += panePtr->paneHeight + (2 * padY);
	    panePtr->sashx = x;
	    panePtr->sashy = y + sashOffset;
	    panePtr->handlex = x + handlePad;
	    panePtr->handley = y + handleOffset;
	    y += sashWidth;
	}

	/*
	 * Find the maximum height/width of the panes, for computing the
	 * requested height/width of the paned window.

	    if (panePtr->height > 0) {
		dim = panePtr->height;
	    } else {
		doubleBw = 2 * Tk_Changes(panePtr->tkwin)->border_width;
		dim = Tk_ReqHeight(panePtr->tkwin) + doubleBw;
	    }
	    dim += 2 * padY;
	    if (dim > reqHeight) {
		reqHeight = dim;
	    }
	} else {
	    /*
	     * If the pane has an explicit width set use that; otherwise, use
	     * the pane's requested width.
	     */

	    if (panePtr->width > 0) {
		dim = panePtr->width;
	    } else {
		doubleBw = 2 * Tk_Changes(panePtr->tkwin)->border_width;
		dim = Tk_ReqWidth(panePtr->tkwin) + doubleBw;
	    }
	    dim += 2 * padX;
	    if (dim > reqWidth) {
		reqWidth = dim;
	    }
	}
    }

    /*

{
    int i;
    int expandPane, reduceFirst, reduceLast, reduceIncr, paneSize, sashOffset;
    Pane *panePtr;
    int stretchReserve = 0;
    int nextSash = sash + 1;
    const int horizontal = (pwPtr->orient == ORIENT_HORIZONTAL);
    int handleSize, sashPad, sashWidth;

    if (diff == 0)
	return;

    /*
     * Update the pane sizes with their real sizes.
     */

    Tk_GetPixelsFromObj(NULL, pwPtr->tkwin, pwPtr->handleSizeObj, &handleSize);
    Tk_GetPixelsFromObj(NULL, pwPtr->tkwin, pwPtr->sashPadObj, &sashPad);
    Tk_GetPixelsFromObj(NULL, pwPtr->tkwin, pwPtr->sashWidthObj, &sashWidth);
    if (pwPtr->showHandle && handleSize > sashWidth) {
	sashOffset = ((handleSize - sashWidth) / 2) + sashPad;
    } else {
	sashOffset = sashPad;
    }
    for (i = 0; i < pwPtr->numPanes; i++) {
	int padX, padY;
	panePtr = pwPtr->panes[i];
	if (panePtr->hide) {
	    continue;
	}
	Tk_GetPixelsFromObj(NULL, panePtr->tkwin, panePtr->padXObj, &padX);
	Tk_GetPixelsFromObj(NULL, panePtr->tkwin, panePtr->padYObj, &padY);
	if (horizontal) {
	    panePtr->paneWidth = panePtr->width = panePtr->sashx
		    - sashOffset - panePtr->x - (2 * padX);
	} else {
	    panePtr->paneHeight = panePtr->height = panePtr->sashy
		    - sashOffset - panePtr->y - (2 * padY);
	}
    }

    /*
     * There must be a next sash since it is only possible to enter this
     * routine when moving an actual sash which implies there exists a visible
     * pane to either side of the sash.

	reduceIncr = -1;
    }

    /*
     * Calculate how much room we have to stretch in and adjust diff value
     * accordingly.
     */
    int minSize;

    Tk_GetPixelsFromObj(NULL, panePtr->tkwin, panePtr->minSizeObj, &minSize);
    for (i = reduceFirst; i != reduceLast; i += reduceIncr) {

	panePtr = pwPtr->panes[i];
	if (panePtr->hide) {
	    continue;
	}
	if (horizontal) {
	    stretchReserve += panePtr->width - minSize;
	} else {
	    stretchReserve += panePtr->height - minSize;
	}
    }
    if (stretchReserve <= 0) {
	return;
    }
    if (diff > stretchReserve) {
	diff = stretchReserve;

	    continue;
	}
	if (horizontal) {
	    paneSize = panePtr->width;
	} else {
	    paneSize = panePtr->height;
	}
	if (diff > (paneSize - minSize)) {
	    diff -= paneSize - minSize;
	    paneSize = minSize;
	} else {
	    paneSize -= diff;
	    i = reduceLast - reduceIncr;
	}
	if (horizontal) {
	    panePtr->paneWidth = panePtr->width = paneSize;
	} else {

static void
DisplayProxyWindow(
    void *clientData)	/* Information about window. */
{
    PanedWindow *pwPtr = (PanedWindow *)clientData;
    Pixmap pixmap;
    Tk_Window tkwin = pwPtr->proxywin;
    int proxyBorderWidth;

    pwPtr->flags &= ~PROXY_REDRAW_PENDING;
    if ((tkwin == NULL) || !Tk_IsMapped(tkwin)) {
	return;
    }

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

    pixmap = Tk_GetPixmap(Tk_Display(tkwin), Tk_WindowId(tkwin),
	    Tk_Width(tkwin), Tk_Height(tkwin), Tk_Depth(tkwin));
#else
    pixmap = Tk_WindowId(tkwin);
#endif /* TK_NO_DOUBLE_BUFFERING */

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

    Tk_GetPixelsFromObj(NULL, tkwin, pwPtr->proxyBorderWidthObj, &proxyBorderWidth);
	Tk_Fill3DRectangle(tkwin, pixmap,
	    pwPtr->proxyBackground ? pwPtr->proxyBackground : pwPtr->background,
	    0, 0, Tk_Width(tkwin), Tk_Height(tkwin), proxyBorderWidth,
	    (pwPtr->proxyRelief != TK_RELIEF_NULL) ? pwPtr->proxyRelief : pwPtr->sashRelief);

#ifndef TK_NO_DOUBLE_BUFFERING
    /*
     * Copy the pixmap to the display.
     */

	}

	if (Tcl_GetIntFromObj(interp, objv[4], &y) != TCL_OK) {
	    return TCL_ERROR;
	}

	internalBW = Tk_InternalBorderLeft(pwPtr->tkwin);
    Tk_GetPixelsFromObj(NULL, pwPtr->tkwin, pwPtr->sashWidthObj, &sashWidth);
	if (pwPtr->orient == ORIENT_HORIZONTAL) {
	    if (x < 0) {
		x = 0;
	    }
	    pwWidth = Tk_Width(pwPtr->tkwin) - (2 * internalBW);
	    if (x > pwWidth) {
		x = pwWidth;
	    }
	    y = Tk_InternalBorderLeft(pwPtr->tkwin);

	    sashHeight = Tk_Height(pwPtr->tkwin) -
		    (2 * Tk_InternalBorderLeft(pwPtr->tkwin));
	} else {
	    if (y < 0) {
		y = 0;
	    }
	    pwHeight = Tk_Height(pwPtr->tkwin) - (2 * internalBW);
	    if (y > pwHeight) {
		y = pwHeight;
	    }
	    x = Tk_InternalBorderLeft(pwPtr->tkwin);
	    sashHeight = sashWidth;
	    sashWidth = Tk_Width(pwPtr->tkwin) -
		    (2 * Tk_InternalBorderLeft(pwPtr->tkwin));
	}

	if (sashWidth < 1) {
	    sashWidth = 1;
	}

PanedWindowIdentifyCoords(
    PanedWindow *pwPtr,		/* Information about the widget. */
    Tcl_Interp *interp,		/* Interpreter in which to store result. */
    int x, int y)		/* Coordinates of the point to identify. */
{
    int i, sashHeight, sashWidth, thisx, thisy;
    int found, isHandle, lpad, rpad, tpad, bpad;
    int first, last, handleSize, sashPad;

    Tk_GetPixelsFromObj(NULL, pwPtr->tkwin, pwPtr->handleSizeObj, &handleSize);
    Tk_GetPixelsFromObj(NULL, pwPtr->tkwin, pwPtr->sashPadObj, &sashPad);
    Tk_GetPixelsFromObj(NULL, pwPtr->tkwin, pwPtr->sashWidthObj, &sashWidth);
    if (pwPtr->orient == ORIENT_HORIZONTAL) {
	if (Tk_IsMapped(pwPtr->tkwin)) {
	    sashHeight = Tk_Height(pwPtr->tkwin);
	} else {
	    sashHeight = Tk_ReqHeight(pwPtr->tkwin);
	}
	sashHeight -= 2 * Tk_InternalBorderLeft(pwPtr->tkwin);
	if (pwPtr->showHandle && handleSize > sashWidth) {

	    lpad = (handleSize - sashWidth) / 2;
	    rpad = handleSize - lpad;
	    lpad += sashPad;
	    rpad += sashPad;
	    sashWidth = handleSize;
	} else {

	    lpad = rpad = sashPad;
	}
	tpad = bpad = 0;
    } else {
	if (pwPtr->showHandle && handleSize > sashWidth) {
	    sashHeight = handleSize;
	    tpad = (handleSize - sashWidth) / 2;
	    bpad = handleSize - tpad;
	    tpad += sashPad;
	    bpad += sashPad;
	} else {
	    sashHeight = sashWidth;
	    tpad = bpad = sashPad;
	}
	if (Tk_IsMapped(pwPtr->tkwin)) {
	    sashWidth = Tk_Width(pwPtr->tkwin);
	} else {
	    sashWidth = Tk_ReqWidth(pwPtr->tkwin);
	}
	sashWidth -= 2 * Tk_InternalBorderLeft(pwPtr->tkwin);

	     * Determine if the point is over the handle or the sash.
	     */

	    if (pwPtr->showHandle) {
		thisx = pwPtr->panes[i]->handlex;
		thisy = pwPtr->panes[i]->handley;
		if (pwPtr->orient == ORIENT_HORIZONTAL) {
		    if (thisy <= y && y <= (thisy + handleSize)) {
			isHandle = 1;
		    }
		} else {
		    if (thisx <= x && x <= (thisx + handleSize)) {
			isHandle = 1;
		    }
		}
	    }
	    break;
	}
    }