/*  Part of XPCE --- The SWI-Prolog GUI toolkit

    Author:        Jan Wielemaker and Anjo Anjewierden
    E-mail:        jan@swi.psy.uva.nl
    WWW:           http://www.swi.psy.uva.nl/projects/xpce/
    Copyright (c)  1985-2002, University of Amsterdam
    All rights reserved.

    Redistribution and use in source and binary forms, with or without
    modification, are permitted provided that the following conditions
    are met:

    1. Redistributions of source code must retain the above copyright
       notice, this list of conditions and the following disclaimer.

    2. Redistributions in binary form must reproduce the above copyright
       notice, this list of conditions and the following disclaimer in
       the documentation and/or other materials provided with the
       distribution.

    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
    "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
    LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
    FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
    COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
    INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
    BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
    LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
    CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
    LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
    ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
    POSSIBILITY OF SUCH DAMAGE.
*/

#include <h/kernel.h>
#include <h/graphics.h>

static status scrollbarsWindowDecorator(WindowDecorator dw, Name bars);
static status labelWindowDecorator(WindowDecorator, CharArray, int, Any *);
static status rearrangeWindowDecorator(WindowDecorator dw);


static status
initialiseWindowDecorator(WindowDecorator dw, PceWindow w,
			  Name bars, Name label)
{ initialiseWindow((PceWindow) dw, DEFAULT, DEFAULT, DEFAULT);

  if ( notDefault(bars) )
    scrollbarsWindowDecorator(dw, bars);
  if ( notDefault(label) )
    send(dw, NAME_label, label, EAV);

  assign(dw, window, w);
  send(w, NAME_decorate, NAME_grow, ZERO, ZERO, ZERO, ZERO, dw, EAV); /* TBD */

  succeed;
}


static status
unlinkWindowDecorator(WindowDecorator dw)
{ PceWindow sw;

  if ( notNil((sw = dw->window)) )
  { addCodeReference(sw);
    assign(dw, window, NIL);
    freeObject(sw);
    delCodeReference(sw);
  }

  return unlinkWindow((PceWindow) dw);
}

		 /*******************************
		 *	   ATTACH PARTS		*
		 *******************************/


static status
horizontalScrollbarWindowDecorator(WindowDecorator dw, BoolObj val)
{ if ( val == ON && isNil(dw->horizontal_scrollbar) )
  { assign(dw, horizontal_scrollbar,
	   newObject(ClassScrollBar, dw->window, NAME_horizontal, EAV));
    displayDevice(dw, dw->horizontal_scrollbar, DEFAULT);
    send(dw, NAME_rearrange, EAV);
  } else if ( val == OFF && notNil(dw->horizontal_scrollbar) )
  { freeObject(dw->horizontal_scrollbar);
    assign(dw, horizontal_scrollbar, NIL);
    send(dw, NAME_rearrange, EAV);
  }

  succeed;
}


static status
verticalScrollbarWindowDecorator(WindowDecorator dw, BoolObj val)
{ if ( val == ON && isNil(dw->vertical_scrollbar) )
  { assign(dw, vertical_scrollbar,
	   newObject(ClassScrollBar, dw->window, NAME_vertical, EAV));
    displayDevice(dw, dw->vertical_scrollbar, DEFAULT);
    send(dw, NAME_rearrange, EAV);
  } else if ( val == OFF && notNil(dw->vertical_scrollbar) )
  { freeObject(dw->vertical_scrollbar);
    assign(dw, vertical_scrollbar, NIL);
    send(dw, NAME_rearrange, EAV);
  }

  succeed;
}


static status
scrollbarsWindowDecorator(WindowDecorator dw, Name bars)
{ BoolObj vbar = OFF;
  BoolObj hbar = OFF;

  if ( equalName(bars, NAME_vertical) )
    vbar = ON;
  else if ( equalName(bars, NAME_horizontal) )
    hbar = ON;
  else if ( equalName(bars, NAME_both) )
    vbar = hbar = ON;

  horizontalScrollbarWindowDecorator(dw, hbar);
  verticalScrollbarWindowDecorator(dw, vbar);

  succeed;
}


static Name
getScrollbarsWindowDecorator(WindowDecorator dw)
{ if ( notNil(dw->horizontal_scrollbar) )
  { if ( notNil(dw->vertical_scrollbar) )
      answer(NAME_both);
    answer(NAME_horizontal);
  } else
  { if ( notNil(dw->vertical_scrollbar) )
      answer(NAME_vertical);
    answer(NAME_none);
  }
}


status
requestComputeScrollbarsWindowDecorator(WindowDecorator dw)
{ if ( notNil(dw->horizontal_scrollbar) )
    requestComputeGraphical(dw->horizontal_scrollbar, DEFAULT);
  if ( notNil(dw->vertical_scrollbar) )
  { DEBUG(NAME_window, Cprintf("Requesting compute for %s (now %s)\n",
			       pp(dw->vertical_scrollbar),
			       pp(dw->vertical_scrollbar->request_compute)));
    requestComputeGraphical(dw->vertical_scrollbar, DEFAULT);
  }

  succeed;
}


static status
showScrollBarWindowDecodaror(WindowDecorator dw, BoolObj show, ScrollBar sb)
{ if ( sb == dw->horizontal_scrollbar ||
       sb == dw->vertical_scrollbar )
  { DisplayedGraphical(sb, show);
    rearrangeWindowDecorator(dw);
  }

  succeed;
}


		 /*******************************
		 *	    ARRANGING		*
		 *******************************/


static void
compute_margins_window_decorator(WindowDecorator dw,
				 Int *lm, Int *tm, Int *rm, Int *bm)
{ int l=0, t=0, r=0, b=0;		/* margins we need */

  if ( notNil(dw->label_text) )
    t += valInt(getAreaGraphical((Graphical) dw->label_text)->h);
  if ( notNil(dw->horizontal_scrollbar) )
  { int m = valInt(getMarginScrollBar(dw->horizontal_scrollbar));

    if ( m > 0 )
      b += m;
    else
      t -= m;
  }
  if ( notNil(dw->vertical_scrollbar) )
  { int m = valInt(getMarginScrollBar(dw->vertical_scrollbar));

    if ( m > 0 )
      r += m;
    else
      l -= m;
  }

  *lm = toInt(l), *tm = toInt(t), *rm = toInt(r), *bm = toInt(b);
}


static status
rearrangeWindowDecorator(WindowDecorator dw)
{ Int lm, tm, rm, bm;			/* margins we need */

  compute_margins_window_decorator(dw, &lm, &tm, &rm, &bm);
  doSetGraphical(dw->window,
		 lm, tm,
		 sub(dw->area->w, add(lm, rm)),
		 sub(dw->area->h, add(tm, bm)));
  if ( notNil(dw->horizontal_scrollbar) &&
       dw->horizontal_scrollbar->displayed == ON )
    placeScrollBar(dw->horizontal_scrollbar, DEFAULT);
  if ( notNil(dw->vertical_scrollbar) &&
       dw->vertical_scrollbar->displayed == ON )
    placeScrollBar(dw->vertical_scrollbar, DEFAULT);

  succeed;
}

		 /*******************************
		 *	      COMPUTE		*
		 *******************************/

static status
computeWindowDecorator(WindowDecorator dw)
{ if ( notNil(dw->request_compute) )
  { int changed = TRUE;
    int maxloop = 2;

    while(changed && maxloop-- > 0)
    { changed = FALSE;

      if ( notNil(dw->vertical_scrollbar) &&
	   notNil(dw->vertical_scrollbar->request_compute) )
      { changed++;
	ComputeGraphical(dw->vertical_scrollbar);
      }
      if ( notNil(dw->horizontal_scrollbar) &&
	   notNil(dw->horizontal_scrollbar->request_compute) )
      { changed++;
	ComputeGraphical(dw->horizontal_scrollbar);
      }
      computeWindow((PceWindow)dw);
      ComputeGraphical(dw->window);
    }
  }

  succeed;
}


		 /*******************************
		 *	     GEOMETRY		*
		 *******************************/

static status
geometryWindowDecorator(WindowDecorator dw, Int x, Int y, Int w, Int h)
{ geometryWindow((PceWindow)dw, x, y, w, h);

  send(dw, NAME_rearrange, EAV);

  succeed;
}


static status
requestGeometryWindowDecorator(WindowDecorator dw, Int x, Int y, Int w, Int h)
{ Int lm, tm, rm, bm;			/* margins we need */
  Int nw, nh;

  compute_margins_window_decorator(dw, &lm, &tm, &rm, &bm);
  nw = (isDefault(w) ? w : add(w, add(lm, rm)));
  nh = (isDefault(h) ? h : add(h, add(tm, bm)));

  if ( notNil(dw->tile) )
  { setTile(dw->tile, DEFAULT, DEFAULT, nw, nh);

    if ( notNil(dw->frame) )
      send(dw->frame, NAME_fit, EAV);
  } else
    geometryWindowDecorator(dw, x, y, nw, nh);

  succeed;
}


static status
resizeWindowDecorator(WindowDecorator dw)
{ resizeWindow((PceWindow)dw);
  resizeWindow(dw->window);

  succeed;
}

		 /*******************************
		 *	   COMMUNICATION	*
		 *******************************/

static status
displayedWindowDecorator(WindowDecorator dw, BoolObj val)
{ displayedGraphical(dw, val);

  return DisplayedGraphical(dw->window, val);
}


static status
ComputeDesiredSizeWindowDecorator(WindowDecorator dw)
{ return send(dw->window, NAME_ComputeDesiredSize, EAV);
}


static status
layoutDialogWindowDecorator(Device d, Size gap, Size bb, Size border)
{ succeed;
}

		 /*******************************
		 *	    WINDOW LABEL	*
		 *******************************/

static status
labelWindowDecorator(WindowDecorator dw, CharArray fmt, int argc, Any *argv)
{ if ( isNil(fmt) )
  { freeObject(dw->label_text);
    assign(dw, label_text, NIL);
  } else
  { string tmp;
    FontObj font = getClassVariableValueObject(dw, NAME_labelFont);

    str_writefv(&tmp, fmt, argc, argv);

    if ( isNil(dw->label_text) )
    { assign(dw, label_text, newObject(ClassText, DEFAULT, DEFAULT, font, EAV));
      displayDevice(dw, dw->label_text, DEFAULT);
    }
    transparentText(dw->label_text, ON);
    stringText(dw->label_text, (CharArray) StringToString(&tmp));
    str_unalloc(&tmp);
  }

  send(dw, NAME_rearrange, EAV);

  succeed;
}


static CharArray
getLabelWindowDecorator(WindowDecorator dw)
{ if ( notNil(dw->label_text) )
    answer(dw->label_text->string);

  fail;
}


		 /*******************************
		 *	 CLASS DECLARATION	*
		 *******************************/

/* Type declarations */

static char *T_label[] =
        { "format=char_array*", "argument=any ..." };
static char *T_showScrollBar[] =
        { "show=[bool]", "which=[scroll_bar]" };
static char *T_layout[] =
        { "gap=[size]", "size=[size]", "border=[size]" };
static char *T_initialise[] =
        { "window=window", "scrollbars=[{none,vertical,horizontal,both}]", "label=[char_array]" };
static char *T_xADintD_yADintD_widthADintD_heightADintD[] =
        { "x=[int]", "y=[int]", "width=[int]", "height=[int]" };

/* Instance Variables */

static vardecl var_windowDecorator[] =
{ IV(NAME_window, "window", IV_GET,
     NAME_client, "Decorated window"),
  IV(NAME_horizontalScrollbar, "scroll_bar*", IV_GET,
     NAME_scroll, "Scrollbar for X-direction"),
  IV(NAME_verticalScrollbar, "scroll_bar*", IV_GET,
     NAME_scroll, "Scrollbar for Y-direction"),
  IV(NAME_labelText, "text*", IV_GET,
     NAME_label, "Text object to display label")
};

/* Send Methods */

static senddecl send_windowDecorator[] =
{ SM(NAME_displayed, 1, "bool", displayedWindowDecorator,
     DEFAULT, "(Un)display window.  Take care of <-window"),
  SM(NAME_geometry, 4, T_xADintD_yADintD_widthADintD_heightADintD, geometryWindowDecorator,
     DEFAULT, "Update internals"),
  SM(NAME_initialise, 3, T_initialise, initialiseWindowDecorator,
     DEFAULT, "Create decoration for window"),
  SM(NAME_requestGeometry, 4, T_xADintD_yADintD_widthADintD_heightADintD, requestGeometryWindowDecorator,
     DEFAULT, "Handle window geometry request"),
  SM(NAME_compute, 0, NULL, computeWindowDecorator,
     NAME_update, "Recompute window"),
  SM(NAME_resize, 0, NULL, resizeWindowDecorator,
     DEFAULT, "Also `window ->resize' <-window"),
  SM(NAME_unlink, 0, NULL, unlinkWindowDecorator,
     DEFAULT, "Make sure <-window is destroyed"),
  SM(NAME_label, 2, T_label, labelWindowDecorator,
     NAME_label, "Define window-level label"),
  SM(NAME_ComputeDesiredSize, 0, NULL, ComputeDesiredSizeWindowDecorator,
     NAME_layout, "Compute the desired size (delegate to <-window)"),
  SM(NAME_layoutDialog, 3, T_layout, layoutDialogWindowDecorator,
     NAME_layout, "(Re)compute layout of dialog_items (ignore)"),
  SM(NAME_rearrange, 0, NULL, rearrangeWindowDecorator,
     NAME_layout, "Rearrange <-window, <-scrollbars and <-label_text"),
  SM(NAME_horizontalScrollbar, 1, "bool", horizontalScrollbarWindowDecorator,
     NAME_scroll, "Attach/detach horizontal scrollbar"),
  SM(NAME_scrollbars, 1, "{none,horizontal,vertical,both}", scrollbarsWindowDecorator,
     NAME_scroll, "Set/remove scrollbars"),
  SM(NAME_verticalScrollbar, 1, "bool", verticalScrollbarWindowDecorator,
     NAME_scroll, "Attach/detach horizontal scrollbar"),
  SM(NAME_showScrollBar, 2, T_showScrollBar, showScrollBarWindowDecodaror,
     NAME_scroll, "Control visibility of the indicated scroll_bar")
};

/* Get Methods */

static getdecl get_windowDecorator[] =
{ GM(NAME_label, 0, "char_array", NULL, getLabelWindowDecorator,
     NAME_label, "Currently displayed label"),
  GM(NAME_scrollbars, 0, "{none,horizontal,vertical,both}", NULL, getScrollbarsWindowDecorator,
     NAME_scroll, "Available scrollbars")
};

/* Resources */

static classvardecl rc_windowDecorator[] =
{ RC(NAME_border, "int", "0",
     "Distance between outside and inside"),
  RC(NAME_labelFont, "font", "bold",
     "Font to display label"),
  RC(NAME_pen, "int", "0",
     "Thickness of outside line"),
  RC(NAME_background, RC_REFINE, "@_dialog_bg",
     NULL)
};

/* Class Declaration */

static Name windowDecorator_termnames[] =
	{ NAME_window };

ClassDecl(windowDecorator_decls,
          var_windowDecorator, send_windowDecorator,
	  get_windowDecorator, rc_windowDecorator,
          1, windowDecorator_termnames);


status
makeClassWindowDecorator(Class class)
{ return declareClass(class, &windowDecorator_decls);
}
