non/FL/Fl_Packscroller.H

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/*******************************************************************************/
/* Copyright (C) 2010 Jonathan Moore Liles */
/* */
/* This program is free software; you can redistribute it and/or modify it */
/* under the terms of the GNU General Public License as published by the */
/* Free Software Foundation; either version 2 of the License, or (at your */
/* option) any later version. */
/* */
/* This program is distributed in the hope that it will be useful, but WITHOUT */
/* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or */
/* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for */
/* more details. */
/* */
/* You should have received a copy of the GNU General Public License along */
/* with This program; see the file COPYING. If not,write to the Free Software */
/* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
/*******************************************************************************/
/* Scrolling group suitable for containing a single child (a
* pack). When the Fl_Packscroller is resized, the child will be resized
* too. No scrollbars are displayed, but the widget responds to
* FL_MOUSEWHEEL events. */
#pragma once
#include <FL/Fl_Group.H>
#include <FL/fl_draw.H>
#include <FL/Fl.H>
/* FIXME: Optimize scroll */
class Fl_Packscroller : public Fl_Group
{
int _increment;
int _yposition;
static const int sbh = 15; /* scroll button height */
public:
Fl_Packscroller ( int X, int Y, int W, int H, const char *L = 0 ) : Fl_Group( X, Y, W, H, L )
{
_increment = 30;
_yposition = 0;
// color( FL_WHITE );
}
int increment ( void ) const { return _increment; }
void increment ( int v ) { _increment = v; }
void yposition ( int v )
{
if ( ! children() )
return;
int Y = v;
if ( Y > 0 )
Y = 0;
const int H = h();
// - (sbh * 2);
Fl_Widget *o = child( 0 );
if ( o->h() > H &&
Y + o->h() < H )
Y = H - o->h();
else if ( o->h() < H )
Y = 0;
if ( _yposition != Y )
{
_yposition = Y;
damage( FL_DAMAGE_SCROLL );
}
}
int yposition ( void ) const
{
if ( children() )
return child( 0 )->y() - (y() + sbh);
return 0;
}
void bbox ( int &X, int &Y, int &W, int &H )
{
X = x();
Y = y() + ( sbh * top_sb_visible() );
W = w();
H = h() - ( sbh * ( top_sb_visible() + bottom_sb_visible() ) );
}
int top_sb_visible ( void )
{
return children() && child(0)->y() != y() ? 1 : 0;
}
int bottom_sb_visible ( void )
{
if ( children() )
{
Fl_Widget *o = child( 0 );
if ( o->h() > h() && o->y() + o->h() != y() + h() )
return 1;
}
return 0;
}
virtual void
draw ( void )
{
if ( damage() & FL_DAMAGE_ALL )
{
fl_rectf( x(), y(), w(), h(), color() );
}
if ( ! children() )
return;
Fl_Widget *o = child( 0 );
o->position( x(), y() + _yposition );
const int top_sb = top_sb_visible();
const int bottom_sb = bottom_sb_visible();
fl_push_clip( x(), y() + ( sbh * top_sb ), w(), h() - (sbh * (top_sb + bottom_sb) ));
draw_children();
fl_pop_clip();
fl_font( FL_HELVETICA, 12 );
if ( top_sb )
{
fl_draw_box( box(), x(), y(), w(), sbh, color() );
fl_color( fl_contrast( FL_FOREGROUND_COLOR, color() ) );
fl_draw( "@2<", x(), y(), w(), sbh, FL_ALIGN_CENTER );
}
if ( bottom_sb )
{
fl_draw_box( box(), x(), y() + h() - sbh, w(), sbh, color() );
fl_color( fl_contrast( FL_FOREGROUND_COLOR, color() ) );
fl_draw( "@2>", x(), y() + h() - sbh, w(), sbh, FL_ALIGN_CENTER );
}
}
virtual int
handle ( int m )
{
switch ( m )
{
case FL_PUSH:
if ( top_sb_visible() &&
Fl::event_inside( x(), y(), w(), sbh ) )
{
return 1;
}
else if ( bottom_sb_visible() &&
Fl::event_inside( x(), y() + h() - sbh, w(), sbh ) )
{
return 1;
}
break;
case FL_RELEASE:
{
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if ( top_sb_visible() &&
Fl::event_inside( x(), y(), w(), sbh ) )
{
yposition( yposition() + ( h() / 4 ) );
return 1;
}
else if ( bottom_sb_visible() &&
Fl::event_inside( x(), y() + h() - sbh, w(), sbh ) )
{
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yposition( yposition() - (h() / 4 ) );
return 1;
}
break;
}
case FL_KEYBOARD:
{
if ( Fl::event_key() == FL_Up )
{
yposition( yposition() + ( h() / 4 ) );
return 1;
}
else if ( Fl::event_key() == FL_Down )
{
yposition( yposition() - (h() / 4 ) );
return 1;
}
break;
}
case FL_MOUSEWHEEL:
{
yposition( yposition() - ( Fl::event_dy() * _increment ) );
return 1;
}
}
return Fl_Group::handle( m );
}
};