// $Id: Flu_Wrap_Group.cpp,v 1.8 2004/01/27 21:44:24 jbryan Exp $

/***************************************************************
 *                FLU - FLTK Utility Widgets 
 *  Copyright (C) 2002 Ohio Supercomputer Center, Ohio State University
 *
 * This file and its content is protected by a software license.
 * You should have received a copy of this license with this file.
 * If not, please contact the Ohio Supercomputer Center immediately:
 * Attn: Jason Bryan Re: FLU 1224 Kinnear Rd, Columbus, Ohio 43212
 * 
 ***************************************************************/



#include "Flu_Wrap_Group.h"
#include <string.h>
#include <stdio.h>

#define MAX( x, y ) ( (x)>(y) ? (x) : (y) )

#define SCROLL_SIZE 15

Flu_Wrap_Group :: Scrollbar :: Scrollbar( int x, int y, int w, int h, const char *l )
  : Fl_Scrollbar( x, y, w, h, l )
{
}

int Flu_Wrap_Group :: Scrollbar :: handle( int event )
{
  if( event == FL_MOUSEWHEEL )
    {
      handle_drag( clamp( value() + linesize() * Fl::e_dy ) );
      return 1;
    }
  else
    return Fl_Scrollbar::handle( event );
}

Flu_Wrap_Group :: Flu_Wrap_Group( int x, int y, int w, int h, const char *l )
  : Fl_Group( x, y, w, h, l ), scrollbar( x+w-SCROLL_SIZE, y, SCROLL_SIZE, h ), group( x, y, w-SCROLL_SIZE, h )
{
  offset( 0, 0 );
  spacing( 0, 0 );
  _type = FL_VERTICAL;
  scrollTo = NULL;

  Fl_Group::add( &scrollbar );
  scrollbar.callback( _scrollCB, this );
  scrollbar.linesize( 10 );
  scrollbar.range( 0, 100 );
  scrollbar.show();

  Fl_Group::add( &group );
  Fl_Group::resizable( group );
  Fl_Group::end();
  group.begin();
}

void Flu_Wrap_Group :: resize( int x, int y, int w, int h )
{
  group.resizable( NULL );
  Fl_Group::resize( x, y, w, h );
  if( type() == FL_VERTICAL )
    {
      scrollbar.resize( x+w-SCROLL_SIZE-Fl::box_dx(box()), y+Fl::box_dy(box()), SCROLL_SIZE, h-Fl::box_dh(box()) );
      group.resize( x, y, w-SCROLL_SIZE-Fl::box_dx(box()), h );
    }
  else
    {
      scrollbar.resize( x+Fl::box_dx(box()), y+h-SCROLL_SIZE-Fl::box_dy(box()), w-Fl::box_dw(box()), SCROLL_SIZE );
      group.resize( x, y, w, h-SCROLL_SIZE-Fl::box_dh(box()) );
    }
  Fl_Group::init_sizes();
  redraw();
}

void Flu_Wrap_Group :: scroll_to( const Fl_Widget *w )
{
  scrollTo = w;
  redraw();
}

void Flu_Wrap_Group :: scroll_to_beginning()
{
  ((Fl_Valuator*)&scrollbar)->value( scrollbar.minimum() );
}

void Flu_Wrap_Group :: scroll_to_end()
{
  ((Fl_Valuator*)&scrollbar)->value( scrollbar.maximum() );
}

void Flu_Wrap_Group :: type( int t )
{
  _type = t;
  resize( x(), y(), w(), h() );
}

Fl_Widget* Flu_Wrap_Group :: next( Fl_Widget* w )
{
  for( int i = 0; i < group.children()-1; i++ )
    {
      if( w == group.child(i) )
	return group.child(i+1);
    }
  return NULL;
}

Fl_Widget* Flu_Wrap_Group :: previous( Fl_Widget* w )
{
  for( int i = 1; i < group.children(); i++ )
    {
      if( w == group.child(i) )
	return group.child(i-1);
    }
  return NULL;
}

Fl_Widget* Flu_Wrap_Group :: above( Fl_Widget* w )
{
  for( int i = 0; i < group.children(); i++ )
    {
      if( w == group.child(i) )
	{
	  int measure[2];
	  measure[0] = w->x() + w->w()/2;
	  measure[1] = w->y() - _spacing[1];
	  int index = layout( scrollbar.visible(), false, measure );
	  if( index >= 0 )
	    return group.child(index);
	  else
	    return group.child(0);
	}
    }
  return NULL;
}

Fl_Widget* Flu_Wrap_Group :: below( Fl_Widget* w )
{
  for( int i = 0; i < group.children(); i++ )
    {
      if( w == group.child(i) )
	{
	  int measure[2];
	  measure[0] = w->x() + w->w()/2;
	  measure[1] = w->y() + w->h() + _spacing[1];
	  int index = layout( scrollbar.visible(), false, measure );
	  if( index >= 0 )
	    return group.child(index);
	  else
	    return group.child(group.children()-1);
	}
    }
  return NULL;
}

Fl_Widget* Flu_Wrap_Group :: left( Fl_Widget* w )
{
  for( int i = 0; i < group.children(); i++ )
    {
      if( w == group.child(i) )
	{
	  int measure[2];
	  measure[0] = w->x() - _spacing[0];
	  measure[1] = w->y() + w->h()/2;
	  int index = layout( scrollbar.visible(), false, measure );
	  if( index >= 0 )
	    return group.child(index);
	  else
	    return group.child(0);
	}
    }
  return NULL;
}

Fl_Widget* Flu_Wrap_Group :: right( Fl_Widget* w )
{
  for( int i = 0; i < group.children(); i++ )
    {
      if( w == group.child(i) )
	{
	  int measure[2];
	  measure[0] = w->x() + w->w() + _spacing[0] + 1;
	  measure[1] = w->y() + w->h()/2;
	  int index = layout( scrollbar.visible(), false, measure );
	  if( index >= 0 )
	    return group.child(index);
	  else
	    return group.child(group.children()-1);
	}
    }
  return NULL;
}

int Flu_Wrap_Group :: layout( bool sbVisible, bool doScrollTo, int *measure )
{
  int xx = x()+Fl::box_dx(box()), yy = y()+Fl::box_dy(box()),
    ww = w()-Fl::box_dw(box()), hh = h()-Fl::box_dh(box());

  if( type() == FL_VERTICAL )
    {
      int i, X, Y, maxH, H, col, row, maxW, scrollY;
      Fl_Widget *c;

      scrollbar.type( FL_VERTICAL );

    BEGIN_H:

      X = xx+_offset[0];
      Y = yy+_offset[1] - (sbVisible ? scrollbar.value() : 0);
      maxH = _offset[1];
      H = 0;
      col = 0;
      row = 0;
      scrollY = 0;
      maxW = xx + ww - (sbVisible ? scrollbar.w() : 0);

      for( i = 0; i < group.children(); i++ )
	{
	  c = group.child(i);
	  if( !c->visible() )
	    continue;
	  H = MAX( H, c->h() );
	  if( col == 0 )
	    maxH += H + _spacing[1];
	  if( ( X + c->w() ) > maxW )
	    {
	      Y += H + _spacing[1];
	      scrollY += H + _spacing[1];
	      if( i == group.children()-1 )
		maxH += H + _spacing[1];

	      if( measure )
		{
		  if( xx+_offset[0] <= measure[0] && measure[0] <= xx+c->w()+_offset[0]+_spacing[0] &&
		      Y <= measure[1] && measure[1] <= Y+c->h()+_spacing[1] )
		    return i;
		}
	      else
		c->position( xx+_offset[0], Y );

	      col = 0;
	      row++;
	      H = 0;
	      X = xx+c->w() + _offset[0] + _spacing[0];
	    }
	  else
	    {
	      if( measure )
		{
		  if( X <= measure[0] && measure[0] <= X+c->w()+_spacing[0] &&
		      Y <= measure[1] && measure[1] <= Y+c->h()+_spacing[1] )
		    return i;
		}
	      else
		c->position( X, Y );
	      X += c->w() + _spacing[0];
	      col++;
	    }

	  if( doScrollTo && (c == scrollTo) )
	    {
	      if( scrollY > scrollbar.maximum() )
		scrollY = (int)scrollbar.maximum();
	      ((Fl_Valuator*)&scrollbar)->value( scrollY );
	      scrollTo = NULL;
	      goto BEGIN_H;
	    }

	  // if we exceed the height and the scrollbar is not visible,
	  // then it will soon become visible so we don't need to process anymore
	  if( !measure && !sbVisible && maxH > hh )
	    return 1;
	}

      if( measure )
	return -1;
      else if( maxH > hh )
	{
	  scrollbar.range( 0, maxH-hh );
	  scrollbar.slider_size( MAX( float(scrollbar.h()-(maxH-hh))/float(scrollbar.h()), 0.08f ) );
	  return 1;
	}
      else
	return 0;
    }
  else
    {
      int i, X, Y, W, maxW, maxH, col, row, scrollX;
      Fl_Widget *c;

      scrollbar.type( FL_HORIZONTAL );

    BEGIN_W:

      X = xx+_offset[0] - (sbVisible ? scrollbar.value() : 0);
      Y = yy+_offset[1];
      maxW = _offset[0];
      W = 0;
      col = 0;
      row = 0;
      scrollX = 0;
      maxH = yy + hh - (sbVisible ? scrollbar.h() : 0);

      for( i = 0; i < group.children(); i++ )
	{
	  c = group.child(i);
	  if( !c->visible() )
	    continue;

	  W = MAX( W, c->w() );

	  if( row == 0 )
	    maxW += W + _spacing[0];

	  if( ( Y + c->h() ) > maxH )
	    {
	      X += W + _spacing[0];
	      scrollX += W + _spacing[0];
	      if( i == group.children()-1 )
		maxW += W + _spacing[0];

	      if( measure )
		{
		  if( X <= measure[0] && measure[0] <= X+c->w()+_spacing[0] &&
		      yy+_offset[1] <= measure[1] && measure[1] <= yy+c->h()+_offset[1]+_spacing[1] )
		    return i;
		}
	      else
		c->position( X, yy+_offset[1] );

	      row = 0;
	      col++;
	      W = 0;
	      Y = yy+c->h() + _offset[1] + _spacing[1];
	    }
	  else
	    {
	      if( measure )
		{
		  if( X <= measure[0] && measure[0] <= X+c->w()+_spacing[0] &&
		      Y <= measure[1] && measure[1] <= Y+c->h()+_spacing[1] )
		    return i;
		}
	      else
		c->position( X, Y );
	      Y += c->h() + _spacing[1];
	      row++;
	    }

	  if( doScrollTo && (c == scrollTo) )
	    {
	      if( scrollX > scrollbar.maximum() )
		scrollX = (int)scrollbar.maximum();
	      ((Fl_Valuator*)&scrollbar)->value( scrollX );
	      scrollTo = NULL;
	      goto BEGIN_W;
	    }

	  // if we exceed the width and the scrollbar is not visible,
	  // then it will soon become visible so we don't need to process anymore
	  if( !measure && !sbVisible && maxW > ww )
	    return 1;
	}

      if( measure )
	return -1;
      else if( maxW > ww )
	{
	  scrollbar.range( 0, maxW-ww );
	  scrollbar.slider_size( MAX( float(scrollbar.w()-(maxW-ww))/float(scrollbar.w()), 0.08f ) );
	  return 1;
	}
      else
	return 0;
    }
}

void Flu_Wrap_Group :: draw()
{
  // we first try to fit all children assuming no scrollbar. if they do not all fit, 
  // we have to turn the scrollbar on and try again
  if( layout( false, false ) )
    {
      scrollbar.show();
      layout( true, false );
    }
  else
    scrollbar.hide();

  // hack to look right when resizing smaller
  if( scrollbar.value() > scrollbar.maximum() )
    {
      ((Fl_Valuator*)&scrollbar)->value( scrollbar.maximum() );
      layout( scrollbar.visible(), scrollTo!=NULL );
    }
  else if( scrollTo )
    layout( scrollbar.visible(), true );

  scrollTo = NULL;

  if( damage() & ~FL_DAMAGE_CHILD)
    {
      draw_box();
      draw_label();
    }
  fl_push_clip( x()+Fl::box_dx(box()), y()+Fl::box_dy(box()),
		w()-Fl::box_dw(box()), h()-Fl::box_dh(box()) );
  draw_children();
  fl_pop_clip();
}