/* $Xorg: MultiSink.c,v 1.4 2001/02/09 02:03:44 xorgcvs Exp $ */

/*
 * Copyright 1991 by OMRON Corporation
 *
 * Permission to use, copy, modify, distribute, and sell this software and its
 * documentation for any purpose is hereby granted without fee, provided that
 * the above copyright notice appear in all copies and that both that
 * copyright notice and this permission notice appear in supporting
 * documentation, and that the name of OMRON not be used in advertising
 * or publicity pertaining to distribution of the software without specific,
 * written prior permission.  OMRON makes no representations about the
 * suitability of this software for any purpose.  It is provided "as is"
 * without express or implied warranty.
 *
 * OMRON DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
 * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
 * EVENT SHALL OMRON BE LIABLE FOR ANY SPECIAL, INDIRECT OR
 * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
 * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
 * TORTUOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
 * PERFORMANCE OF THIS SOFTWARE.
 *
 *      Author: Li Yuhong	 OMRON Corporation
 */

/***********************************************************

Copyright 1987, 1988, 1994, 1998  The Open Group

Permission to use, copy, modify, distribute, and sell this software and its
documentation for any purpose is hereby granted without fee, provided that
the above copyright notice appear in all copies and that both that
copyright notice and this permission notice appear in supporting
documentation.

The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL THE
OPEN GROUP BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

Except as contained in this notice, the name of The Open Group shall not be
used in advertising or otherwise to promote the sale, use or other dealings
in this Software without prior written authorization from The Open Group.


Copyright 1987, 1988 by Digital Equipment Corporation, Maynard, Massachusetts.

                        All Rights Reserved

Permission to use, copy, modify, and distribute this software and its 
documentation for any purpose and without fee is hereby granted, 
provided that the above copyright notice appear in all copies and that
both that copyright notice and this permission notice appear in 
supporting documentation, and that the name of Digital not be
used in advertising or publicity pertaining to distribution of the
software without specific, written prior permission.  

DIGITAL DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING
ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL
DIGITAL BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR
ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION,
ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
SOFTWARE.

******************************************************************/
/* $XFree86: xc/lib/Xaw/MultiSink.c,v 1.19 2001/01/17 19:42:27 dawes Exp $ */

#include <X11/IntrinsicP.h>
#include <X11/StringDefs.h>
#include <X11/Xatom.h>
#include <X11/Xaw/XawInit.h>
#include <X11/Xaw/MultiSinkP.h>
#include <X11/Xaw/MultiSrcP.h>
#include <X11/Xaw/TextP.h>
#include "XawI18n.h"
#include <stdio.h>
#include <ctype.h>
#include "Private.h"

#ifdef GETLASTPOS
#undef GETLASTPOS		/* We will use our own GETLASTPOS */
#endif

#define GETLASTPOS	\
	XawTextSourceScan(source, 0, XawstAll, XawsdRight, 1, True)

/*
 * Class Methods
 */
static void XawMultiSinkClassInitialize(void);
static void XawMultiSinkInitialize(Widget, Widget, ArgList, Cardinal*);
static void XawMultiSinkDestroy(Widget);
static void XawMultiSinkResize(Widget);
static Boolean XawMultiSinkSetValues(Widget, Widget, Widget,
				     ArgList, Cardinal*);
static int MaxLines(Widget, unsigned int);
static int MaxHeight(Widget, int);
static void SetTabs(Widget, int, short*);
static void DisplayText(Widget, int, int,
			XawTextPosition, XawTextPosition, Bool);
static void InsertCursor(Widget, int, int, XawTextInsertState);
static void FindPosition(Widget, XawTextPosition, int, int, Bool,
			 XawTextPosition*, int*, int*);
static void FindDistance(Widget, XawTextPosition, int, XawTextPosition, int*,
			 XawTextPosition*, int*);
static void Resolve(Widget, XawTextPosition, int, int, XawTextPosition*);
static void GetCursorBounds(Widget, XRectangle*);

/*
 * Prototypes
 */
static void GetGC(MultiSinkObject);
static int CharWidth(MultiSinkObject, XFontSet, int, wchar_t);
static unsigned int PaintText(Widget w, GC gc, int x, int y,
			      wchar_t *buf, int len, Bool);

/*
 * Defined in TextSink.c
 */
void _XawTextSinkClearToBackground(Widget, int, int, unsigned, unsigned);

/*
 * Initialization
 */
static wchar_t wspace[2];

#define offset(field) XtOffsetOf(MultiSinkRec, multi_sink.field)
static XtResource resources[] = {
  {
    XtNfontSet,
    XtCFontSet,
    XtRFontSet,
    sizeof(XFontSet),
    offset(fontset),
    XtRString,
    XtDefaultFontSet
  },
  {
    XtNecho,
    XtCOutput,
    XtRBoolean,
    sizeof(Boolean),
    offset(echo),
    XtRImmediate,
    (XtPointer)True
  },
  {
    XtNdisplayNonprinting,
    XtCOutput,
    XtRBoolean,
    sizeof(Boolean),
    offset(display_nonprinting),
    XtRImmediate,
    (XtPointer)True
  },
};
#undef offset

#define SuperClass		(&textSinkClassRec)
MultiSinkClassRec multiSinkClassRec = {
  /* object */
  {
    (WidgetClass)SuperClass,		/* superclass */
    "MultiSink",			/* class_name */
    sizeof(MultiSinkRec),		/* widget_size */
    XawMultiSinkClassInitialize,	/* class_initialize */
    NULL,				/* class_part_initialize */
    False,				/* class_inited */
    XawMultiSinkInitialize,		/* initialize */
    NULL,				/* initialize_hook */
    NULL,				/* obj1 */
    NULL,				/* obj2 */
    0,					/* obj3 */
    resources,				/* resources */
    XtNumber(resources),		/* num_resources */
    NULLQUARK,				/* xrm_class */
    False,				/* obj4 */
    False,				/* obj5 */
    False,				/* obj6 */
    False,				/* obj7 */
    XawMultiSinkDestroy,		/* destroy */
    (XtProc)XawMultiSinkResize,		/* obj8 */
    NULL,				/* obj9 */
    XawMultiSinkSetValues,		/* set_values */
    NULL,				/* set_values_hook */
    NULL,				/* obj10 */
    NULL,				/* get_values_hook */
    NULL,				/* obj11 */
    XtVersion,				/* version */
    NULL,				/* callback_private */
    NULL,				/* obj12 */
    NULL,				/* obj13 */
    NULL,				/* obj14 */
    NULL,				/* extension */
  },
    /* text_sink */
  {
    DisplayText,			/* DisplayText */
    InsertCursor,			/* InsertCursor */
    XtInheritClearToBackground,		/* ClearToBackground */
    FindPosition,			/* FindPosition */
    FindDistance,			/* FindDistance */
    Resolve,				/* Resolve */
    MaxLines,				/* MaxLines */
    MaxHeight,				/* MaxHeight */
    SetTabs,				/* SetTabs */
    GetCursorBounds,			/* GetCursorBounds */
  },
  /* multi_sink */
  {
    NULL,				/* extension */
  }
};

WidgetClass multiSinkObjectClass = (WidgetClass)&multiSinkClassRec;

/*
 * Implementation
 */
static int
CharWidth(MultiSinkObject sink, XFontSet fontset, int x, wchar_t c)
{
    int width = 0;

    if (c == _Xaw_atowc(XawLF))
	return (0);

    if (c == _Xaw_atowc(XawTAB)) {
	int i;
	Position *tab;

	width = x;
	/* Adjust for Left Margin. */
	x -= ((TextWidget)XtParent((Widget)sink))->text.left_margin;

	i = 0;
	tab = sink->text_sink.tabs;
	/*CONSTCOND*/
	while (1) {
	    if (x < *tab)
		return (*tab - x);
	    /* Start again */
	    if (++i >= sink->text_sink.tab_count) {
		x -= *tab;
		i = 0;
		tab = sink->text_sink.tabs;
		if (width == x)
		    return (0);
	    }
	    else
		++tab;
	}
	/*NOTREACHED*/
    }

    if (XwcTextEscapement(fontset, &c, 1) == 0) {
	if (sink->multi_sink.display_nonprinting)
	    c = _Xaw_atowc('@');
	else
	    c = _Xaw_atowc(XawSP);
    }

      /*
       * if more efficiency(suppose one column is one ASCII char)

      width = XwcGetColumn(fontset->font_charset, fontset->num_of_fonts, c) *
	      fontset->font_struct_list[0]->min_bounds.width;
       *
       * WARNING: Very Slower!!!
       *
       * Li Yuhong.
       */

    width = XwcTextEscapement(fontset, &c, 1);

    return (width);
}

/*
 * Function:
 *	PaintText
 *
 * Parameters:
 *	w   - text sink object
 *	gc  - gc to paint text
 *	x   - location to paint the text
 *	y   - ""
 *	buf - buffer and length of text to paint
 *	len - ""
 *	clear_bg - clear background before drawing ?
 *
 * Description:
 *	Actually paints the text into the window.
 *
 * Returns:
 *	The width of the text painted
 */
static unsigned int
PaintText(Widget w, GC gc, int x, int y, wchar_t *buf, int len, Bool clear_bg)
{
    MultiSinkObject sink = (MultiSinkObject)w;
    TextWidget ctx = (TextWidget)XtParent(w);
    XFontSet fontset = sink->multi_sink.fontset;
    unsigned int width = XwcTextEscapement(fontset, buf, len);

    if (((int)width) <= -x)		/* Don't draw if we can't see it */
	return (width);

    if (clear_bg) {
	XFontSetExtents *ext = XExtentsOfFontSet(fontset);

	_XawTextSinkClearToBackground(w, x, y - abs(ext->max_logical_extent.y),
				      width, ext->max_logical_extent.height);
	XwcDrawString(XtDisplay(ctx), XtWindow(ctx), fontset, gc, x, y, buf, len);
    }
    else
	XwcDrawImageString(XtDisplay(ctx), XtWindow(ctx), fontset, gc,
			   x, y, buf, len);

    return (width);
}

/* Sink Object Functions */
/*
 * This function does not know about drawing more than one line of text
 */
static void
DisplayText(Widget w, int x, int y,
	    XawTextPosition pos1, XawTextPosition pos2, Bool highlight)
{
    TextWidget ctx = (TextWidget)XtParent(w);
    MultiSinkObject sink = (MultiSinkObject)w;
    XFontSet fontset = sink->multi_sink.fontset;
    Widget source = XawTextGetSource(XtParent(w));
    wchar_t buf[256];
    XFontSetExtents *ext = XExtentsOfFontSet(fontset);
    int j, k;
    XawTextBlock blk;
    GC gc, invgc, tabgc;
    int max_x;
    Bool clear_bg;

    if (!sink->multi_sink.echo || !ctx->text.lt.lines)
	return;

    max_x = (int)XtWidth(ctx) - ctx->text.r_margin.right;
    clear_bg = !highlight && ctx->core.background_pixmap != XtUnspecifiedPixmap;

    gc = highlight ? sink->multi_sink.invgc : sink->multi_sink.normgc;
    invgc = highlight ? sink->multi_sink.normgc : sink->multi_sink.invgc;

    if (highlight && sink->multi_sink.xorgc)
	tabgc = sink->multi_sink.xorgc;
    else
	tabgc = invgc;

    y += abs(ext->max_logical_extent.y);
    for (j = 0; pos1 < pos2;) {
	pos1 = XawTextSourceRead(source, pos1, &blk, (int) pos2 - pos1);
	for (k = 0; k < blk.length; k++) {
	    if ((unsigned) j >= (sizeof(buf) / sizeof(wchar_t)) - 1) {
		/* buffer full, dump the text */
		if ((x += PaintText(w, gc, x, y, buf, j, clear_bg)) >= max_x)
		    return;
		j = 0;
	    }
	    buf[j] = ((wchar_t *)blk.ptr)[k];
	    if (buf[j] == _Xaw_atowc(XawLF))
		continue;

	    else if (buf[j] == _Xaw_atowc(XawTAB)) {
		unsigned int width;

		if (j != 0 &&
		    (x += PaintText(w, gc, x, y, buf, j, clear_bg)) >= max_x)
		    return;

		width = CharWidth(sink, fontset, x, _Xaw_atowc(XawTAB));
		if (clear_bg)
		    _XawTextSinkClearToBackground(w,
					x, y - abs(ext->max_logical_extent.y),
					width, ext->max_logical_extent.height);
		else
		    XFillRectangle(XtDisplayOfObject(w), XtWindowOfObject(w),
				   tabgc, x,
				   y - abs(ext->max_logical_extent.y),
				   width,
				   ext->max_logical_extent.height);
		x += width;
		j = -1;
	    }
	    else if (XwcTextEscapement(sink->multi_sink.fontset, &buf[j], 1)
		     == 0) {
		if (sink->multi_sink.display_nonprinting)
		    buf[j] = _Xaw_atowc('@');
		else
		    buf[j] = _Xaw_atowc(XawSP);
	    }
	    j++;
	}
    }

    if (j > 0)
	(void)PaintText(w, gc, x, y, buf, j, clear_bg);
}

/*
 * Function:
 *	GetCursorBounds
 *
 * Parameters:
 *	w    - text sink object
 *	rect - X rectangle to return the cursor bounds
 *
 * Description:
 *	Returns the size and location of the cursor.
 */
static void
GetCursorBounds(Widget w, XRectangle *rect)
{
    MultiSinkObject sink = (MultiSinkObject)w;

    rect->width = CharWidth(sink, sink->multi_sink.fontset, 0, _Xaw_atowc(XawSP));
    rect->height = (XExtentsOfFontSet(sink->multi_sink.fontset)
		    ->max_logical_extent.height);
    rect->x = sink->multi_sink.cursor_x;
    rect->y = sink->multi_sink.cursor_y - (short)rect->height;
}

/*
 * The following procedure manages the "insert" cursor
 */
static void
InsertCursor(Widget w, int x, int y, XawTextInsertState state)
{
    MultiSinkObject sink = (MultiSinkObject)w;
    XFontSet fontset = sink->multi_sink.fontset;
    Widget ctx = XtParent(w);
    XawTextPosition position = XawTextGetInsertionPoint(ctx);

    if (XtIsRealized(ctx)) {
	int fheight, fdiff;
	XawTextBlock block;
	wchar_t c;
	XawTextPosition selection_start, selection_end;
	Boolean has_selection;
	XFontSetExtents *ext = XExtentsOfFontSet(fontset);

	XawTextGetSelectionPos((Widget)ctx, &selection_start, &selection_end);
	has_selection = selection_start != selection_end;

	fheight = ext->max_logical_extent.height;
	fdiff = fheight - abs(ext->max_logical_extent.y);

	if ((sink->multi_sink.cursor_position != position || state == XawisOff)
	    && !has_selection && sink->multi_sink.laststate != XawisOff) {
	    wchar_t *ochar;

	    (void)XawTextSourceRead(XawTextGetSource(ctx),
				    sink->multi_sink.cursor_position,
				    &block, 1);
	    if (!block.length)
		ochar = NULL;
	    else {
		c = ((wchar_t *)block.ptr)[0];
		if (c == _Xaw_atowc(XawLF))
		    ochar = NULL;
		else if (c == _Xaw_atowc(XawTAB))
		    ochar = wspace;
		else
		    ochar = (wchar_t *)block.ptr;
	    }

	    if (!ochar)
		_XawTextSinkClearToBackground(w, sink->multi_sink.cursor_x,
					      (sink->multi_sink.cursor_y - 1 -
					      fheight), CharWidth(sink, fontset,
								  0, wspace[0]),
					      fheight);
	    else {
		if (XwcTextEscapement(sink->multi_sink.fontset, ochar, 1) != 0)
		    DisplayText(w, sink->multi_sink.cursor_x,
				sink->multi_sink.cursor_y - 1 - fheight,
				sink->multi_sink.cursor_position,
				sink->multi_sink.cursor_position + 1,
				False);
		else
		    PaintText(w, sink->multi_sink.normgc,
			      sink->multi_sink.cursor_x,
			      sink->multi_sink.cursor_y - 1 - fdiff,
			      ochar, 1,
			      ctx->core.background_pixmap != XtUnspecifiedPixmap);
	    }
	}

	if (!has_selection && state != XawisOff) {
	    wchar_t *nchar;
	    Boolean focus = ((TextWidget)ctx)->text.hasfocus;

	    (void)XawTextSourceRead(XawTextGetSource(ctx),
				    position, &block, 1);
	    c = ((wchar_t *)block.ptr)[0];
	    if (!block.length || c == _Xaw_atowc(XawLF)
		|| c == _Xaw_atowc(XawTAB))
		nchar = wspace;
	    else
		nchar = (wchar_t *)block.ptr;

	    if (focus) {
		if (XwcTextEscapement(sink->multi_sink.fontset, nchar, 1) != 0)
		    XwcDrawImageString(XtDisplay(ctx), XtWindow(ctx),
				       fontset, sink->multi_sink.invgc,
				       x, (y - 1 - fdiff), nchar, 1);
		else
		    DisplayText(w, x, y - 1 - fheight,
				position, position + 1, True);
	    }
	    else
		XDrawRectangle(XtDisplay(ctx), XtWindow(ctx),
			       sink->multi_sink.xorgc ?
			       sink->multi_sink.xorgc : sink->multi_sink.normgc,
			       x, y - 1 - fheight,
			       CharWidth(sink, fontset, 0, *nchar) - 1,
			       fheight - 1);
	  }
      }

    sink->multi_sink.cursor_x = x;
    sink->multi_sink.cursor_y = y;
    sink->multi_sink.laststate = state;
    sink->multi_sink.cursor_position = position;
}

/*
 * Given two positions, find the distance between them
 */
static void
FindDistance(Widget w, XawTextPosition fromPos, int fromx,
	     XawTextPosition toPos, int *resWidth,
	     XawTextPosition *resPos, int *resHeight)
{
    MultiSinkObject sink = (MultiSinkObject)w;
    XFontSet fontset = sink->multi_sink.fontset;
    TextWidget ctx = (TextWidget)XtParent(w);
    Widget source = ctx->text.source;
    XawTextPosition idx, pos;
    wchar_t c;
    XFontSetExtents *ext = XExtentsOfFontSet(fontset);
    XawTextBlock blk;
    int i, rWidth;

    pos = XawTextSourceRead(source, fromPos, &blk, toPos - fromPos);
    rWidth = 0;
    for (i = 0, idx = fromPos; idx < toPos; i++, idx++) {
	if (i >= blk.length) {
	    i = 0;
	    XawTextSourceRead(source, pos, &blk, toPos - pos);
	    if (blk.length == 0)
		break;
	}
	c = ((wchar_t *)blk.ptr)[i];
	rWidth += CharWidth(sink, fontset, fromx + rWidth, c);
	if (c == _Xaw_atowc(XawLF)) {
	    idx++;
	    break;
	}
    }

    *resPos = idx;
    *resWidth = rWidth;
    *resHeight = ext->max_logical_extent.height;
}

static void
FindPosition(Widget w, XawTextPosition fromPos, int fromx, int width,
	     Bool stopAtWordBreak, XawTextPosition *resPos, int *resWidth,
	     int *resHeight)
{
    MultiSinkObject sink = (MultiSinkObject)w;
    TextWidget ctx = (TextWidget)XtParent(w);
    Widget source = ctx->text.source;
    XFontSet fontset = sink->multi_sink.fontset;
    XawTextPosition idx, pos, whiteSpacePosition = 0;
    int i, lastWidth, whiteSpaceWidth, rWidth;
    Boolean whiteSpaceSeen;
    wchar_t c;
    XFontSetExtents *ext = XExtentsOfFontSet(fontset);
    XawTextBlock blk;

    pos = XawTextSourceRead(source, fromPos, &blk, BUFSIZ);
    rWidth = lastWidth = whiteSpaceWidth = 0;
    whiteSpaceSeen = False;
    c = 0;

    for (i = 0, idx = fromPos; rWidth <= width; i++, idx++) {
	if (i >= blk.length) {
	    i = 0;
	    pos = XawTextSourceRead(source, pos, &blk, BUFSIZ);
	    if (blk.length == 0)
		break;
	}
	c = ((wchar_t *)blk.ptr)[i];
	lastWidth = rWidth;
	rWidth += CharWidth(sink, fontset, fromx + rWidth, c);

	if (c == _Xaw_atowc(XawLF)) {
	    idx++;
	    break;
	}
	else if ((c == _Xaw_atowc(XawSP) || c == _Xaw_atowc(XawTAB))
		 && rWidth <= width) {
	    whiteSpaceSeen = True;
	    whiteSpacePosition = idx;
	    whiteSpaceWidth = rWidth;
	}
    }

    if (rWidth > width && idx > fromPos) {
	idx--;
	rWidth = lastWidth;
	if (stopAtWordBreak && whiteSpaceSeen) {
	    idx = whiteSpacePosition + 1;
	    rWidth = whiteSpaceWidth;
	}
    }

    if (idx >= ctx->text.lastPos && c != _Xaw_atowc(XawLF))
	idx = ctx->text.lastPos + 1;

    *resPos = idx;
    *resWidth = rWidth;
    *resHeight = ext->max_logical_extent.height;
}

static void
Resolve(Widget w, XawTextPosition pos, int fromx, int width,
	XawTextPosition *pos_return)
{
    int resWidth, resHeight;
    Widget source = XawTextGetSource(XtParent(w));

    FindPosition(w, pos, fromx, width, False, pos_return, &resWidth, &resHeight);
    if (*pos_return > GETLASTPOS)
	*pos_return = GETLASTPOS;
}

static void
GetGC(MultiSinkObject sink)
{
    XtGCMask valuemask = (GCGraphicsExposures | GCClipXOrigin |
			  GCForeground | GCBackground);
    XGCValues values;

    /* XXX We dont want do share a gc that will change the clip-mask */
    values.clip_x_origin = (long)sink;
    values.clip_mask = None;
    values.graphics_exposures = False;
    
    values.foreground = sink->text_sink.foreground;
    values.background = sink->text_sink.background;

    sink->multi_sink.normgc = XtAllocateGC((Widget)sink, 0, valuemask, &values,
					   GCFont | GCClipMask, 0);

    values.foreground = sink->text_sink.background;
#ifndef OLDXAW
    values.background = sink->text_sink.cursor_color;
#else
    values.background = sink->text_sink.foreground;
#endif
    sink->multi_sink.invgc = XtAllocateGC((Widget)sink, 0, valuemask, &values,
					  GCFont | GCClipMask, 0);
#ifndef OLDXAW
    if (sink->text_sink.cursor_color != sink->text_sink.foreground) {
	values.foreground = sink->text_sink.cursor_color;
	values.background = sink->text_sink.foreground;
	sink->multi_sink.xorgc = XtAllocateGC((Widget)sink, 0, valuemask,
					      &values, GCFont | GCClipMask, 0);
    }
    else
#endif /* OLDXAW */
	sink->multi_sink.xorgc = NULL;

    XawMultiSinkResize((Widget)sink);
}

static void
XawMultiSinkClassInitialize(void)
{
    wspace[0] = _Xaw_atowc(XawSP);
    XawInitializeWidgetSet();
}

/*
 * Function:
 *	XawMultiSinkInitialize
 *
 * Parameters:
 *	request - requested and new values for the object instance
 *	cnew    - ""
 *
 * Description:
 *	Initializes the TextSink Object.
 */
/* ARGSUSED */
static void
XawMultiSinkInitialize(Widget request, Widget cnew,
		       ArgList args, Cardinal *num_args)
{
    MultiSinkObject sink = (MultiSinkObject)cnew;

    GetGC(sink);

    if (!sink->multi_sink.fontset) XtError("Aborting: no fontset found\n");

    sink->multi_sink.cursor_position = 0;
    sink->multi_sink.laststate = XawisOff;
    sink->multi_sink.cursor_x = sink->multi_sink.cursor_y = 0;
}

/*
 * Function:
 *	XawMultiSinkDestroy
 *
 * Parameters:
 *	w - MultiSink Object
 *
 * Description:
 *	This function cleans up when the object is destroyed.
 */
static void
XawMultiSinkDestroy(Widget w)
{
    MultiSinkObject sink = (MultiSinkObject)w;

    XtReleaseGC(w, sink->multi_sink.normgc);
    XtReleaseGC(w, sink->multi_sink.invgc);
    if (sink->multi_sink.xorgc)
	XtReleaseGC(w, sink->multi_sink.xorgc);
    sink->multi_sink.normgc =
	sink->multi_sink.invgc =
	sink->multi_sink.xorgc = NULL;
}

static void
XawMultiSinkResize(Widget w)
{
    TextWidget ctx = (TextWidget)XtParent(w);
    MultiSinkObject sink = (MultiSinkObject)w;
    XRectangle rect;
    int width, height;

    if (w->core.widget_class != multiSinkObjectClass)
	return;

    rect.x = ctx->text.r_margin.left;
    rect.y = ctx->text.r_margin.top;
    width = (int)XtWidth(ctx) -
      (int)ctx->text.r_margin.right - (int)ctx->text.r_margin.left;
    height = (int)XtHeight(ctx) -
      (int)ctx->text.r_margin.top - (int)ctx->text.r_margin.bottom;
    rect.width = width;
    rect.height = height;

    if (sink->multi_sink.normgc) {
	if (width >= 0 && height >= 0)
	    XSetClipRectangles(XtDisplay((Widget)ctx), sink->multi_sink.normgc,
			       0, 0, &rect, 1, Unsorted);
	else
	    XSetClipMask(XtDisplay((Widget)ctx), sink->multi_sink.normgc, None);
    }
    if (sink->multi_sink.invgc) {
	if (width >= 0 && height >= 0)
	    XSetClipRectangles(XtDisplay((Widget)ctx), sink->multi_sink.invgc,
			       0, 0, &rect, 1, Unsorted);
	else
	    XSetClipMask(XtDisplay((Widget)ctx), sink->multi_sink.invgc, None);
    }
    if (sink->multi_sink.xorgc) {
	if (width >= 0 && height >= 0)
	    XSetClipRectangles(XtDisplay((Widget)ctx), sink->multi_sink.xorgc,
			       0, 0, &rect, 1, Unsorted);
	else
	    XSetClipMask(XtDisplay((Widget)ctx), sink->multi_sink.xorgc, None);
    }
}

/*
 * Function:
 *	XawMultiSinkSetValues
 *
 * Parameters:
 *	current - current state of the object
 *	request - what was requested
 *	cnew    - what the object will become
 *
 * Description:
 *	Sets the values for the MultiSink.
 *
 * Returns:
 *	True if redisplay is needed
 */
/*ARGSUSED*/
static Boolean
XawMultiSinkSetValues(Widget current, Widget request, Widget cnew,
		      ArgList args, Cardinal *num_args)
{
    MultiSinkObject w = (MultiSinkObject)cnew;
    MultiSinkObject old_w = (MultiSinkObject)current;

    /* Font set is not in the GC! Do not make a new GC when font set changes! */

    if (w->multi_sink.fontset != old_w->multi_sink.fontset) {
	((TextWidget)XtParent(cnew))->text.redisplay_needed = True;
#ifndef NO_TAB_FIX
	SetTabs((Widget)w, w->text_sink.tab_count, w->text_sink.char_tabs);
#endif
    }

    if (w->text_sink.background != old_w->text_sink.background
	|| w->text_sink.foreground != old_w->text_sink.foreground
#ifndef OLDXAW
	|| w->text_sink.cursor_color != old_w->text_sink.cursor_color
#endif
	) {
	XtReleaseGC(cnew, w->multi_sink.normgc);
	XtReleaseGC(cnew, w->multi_sink.invgc);
	if (w->multi_sink.xorgc)
	    XtReleaseGC(cnew, w->multi_sink.xorgc);
	GetGC(w);
	((TextWidget)XtParent(cnew))->text.redisplay_needed = True;
    }
    else if (w->multi_sink.echo != old_w->multi_sink.echo
	     || w->multi_sink.display_nonprinting
	     != old_w->multi_sink.display_nonprinting)
      ((TextWidget)XtParent(cnew))->text.redisplay_needed = True;

    return (False);
}

/*
 * Function:
 *	MaxLines
 *
 * Parameters:
 *	w - MultiSink Object
 *	height - height to fit lines into
 *
 * Description:
 *	Finds the Maximum number of lines that will fit in a given height.
 *
 * Returns:
 *	The number of lines that will fit
 */
/*ARGSUSED*/
static int
MaxLines(Widget w, unsigned int height)
{
    MultiSinkObject sink = (MultiSinkObject)w;
    int font_height;
    XFontSetExtents *ext = XExtentsOfFontSet(sink->multi_sink.fontset);

    font_height = ext->max_logical_extent.height;
    return (height / font_height);
}

/*
 * Function:
 *	MaxHeight
 *
 * Parameters:
 *	w     - MultiSink Object
 *	lines - number of lines
 *
 * Description:
 *	Finds the Minium height that will contain a given number lines.
 * Returns:
 *	The height
 */
/*ARGSUSED*/
static int
MaxHeight(Widget w, int lines)
{
    MultiSinkObject sink = (MultiSinkObject)w;
    XFontSetExtents *ext = XExtentsOfFontSet(sink->multi_sink.fontset);

    return (lines * ext->max_logical_extent.height);
}

/*
 * Function:
 *	SetTabs
 *
 * Arguments:
 *	w	  - MultiSink Object
 *	tab_count - number of tabs in the list
 *	tabs	  - text positions of the tabs
 *
 * Description:
 *	Sets the Tab stops.
 */
static void
SetTabs(Widget w, int tab_count, short* tabs)
{
    MultiSinkObject sink = (MultiSinkObject)w;
    int i;
    Atom XA_FIGURE_WIDTH;
    unsigned long figure_width = 0;
    XFontStruct *font;

    /*
     * Bug:
     *	 Suppose the first font of fontset stores the unit of column.
     *
     * By Li Yuhong, Mar. 14, 1991
     */
    {
	XFontStruct **f_list;
	char **f_name;

	(void)XFontsOfFontSet(sink->multi_sink.fontset, &f_list, &f_name);
	font = f_list[0];
    }

    /*
     * Find the figure width of the current font
     */
    XA_FIGURE_WIDTH = XInternAtom(XtDisplayOfObject(w), "FIGURE_WIDTH", False);
    if (XA_FIGURE_WIDTH != None
	&& (!XGetFontProperty(font, XA_FIGURE_WIDTH, &figure_width)
	    || figure_width == 0)) {
	if (font->per_char && font->min_char_or_byte2 <= '$'
	    && font->max_char_or_byte2 >= '$')
	    figure_width = font->per_char['$' - font->min_char_or_byte2].width;
	else
	    figure_width = font->max_bounds.width;
    }

    if (tab_count > sink->text_sink.tab_count) {
	sink->text_sink.tabs = (Position *)
	    XtRealloc((char *)sink->text_sink.tabs,
		      (Cardinal)(tab_count * sizeof(Position)));
	sink->text_sink.char_tabs = (short *)
	    XtRealloc((char *)sink->text_sink.char_tabs,
		      (Cardinal)(tab_count * sizeof(short)));
      }

    for (i = 0 ; i < tab_count ; i++) {
	sink->text_sink.tabs[i] = tabs[i] * figure_width;
	sink->text_sink.char_tabs[i] = tabs[i];
    }

    sink->text_sink.tab_count = tab_count;

#ifndef NO_TAB_FIX
    ((TextWidget)XtParent(w))->text.redisplay_needed = True;
#endif
}

void
_XawMultiSinkPosToXY(Widget w, XawTextPosition pos, Position *x, Position *y)
{
    MultiSinkObject sink = (MultiSinkObject)((TextWidget)w)->text.sink;
    XFontSetExtents *ext = XExtentsOfFontSet(sink->multi_sink.fontset);

    _XawTextPosToXY(w, pos, x, y);
    *y += abs(ext->max_logical_extent.y);
}
