non/Timeline/Scalebar.H

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/*******************************************************************************/
/* Copyright (C) 2008 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. */
/*******************************************************************************/
#pragma once
#include <FL/Fl.H>
#include <FL/Fl_Scrollbar.H>
#include <FL/Fl_Slider.H>
#include <stdio.h>
class Scalebar : public Fl_Scrollbar
{
double _zoom;
bool _zoom_changed;
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double _zoom_min;
double _zoom_max;
void constrain ( void )
{
if ( _zoom > _zoom_max )
_zoom = _zoom_max;
else
if ( _zoom < _zoom_min )
_zoom = _zoom_min;
}
void maybe_do_callback ( int z )
{
if ( z != _zoom )
{
_zoom_changed = true;
do_callback();
_zoom_changed = false;
slider_size( w() / maximum() );
}
}
public:
Scalebar ( int X, int Y, int W, int H ) : Fl_Scrollbar ( X, Y, W, H )
{
_zoom = 1.0f;
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_zoom_min = 0;
_zoom_max = 256;
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_zoom_changed = false;
step( 1 );
}
bool zoom_changed ( void ) const { return _zoom_changed; }
double zoom ( void ) const { return _zoom; }
void zoom ( double v ) { _zoom = v; }
double value ( void ) const { return Fl_Slider::value(); }
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void zoom_range ( double zmin, double zmax ) { _zoom_min = zmin; _zoom_max = zmax; }
void zoom_out ( void ) { int z = _zoom; _zoom *= 2; constrain(); maybe_do_callback( z ); }
void zoom_in ( void ) {int z = _zoom; _zoom /= 2; constrain(); maybe_do_callback( z ); }
int
handle ( int m )
{
switch ( m )
{
case FL_MOUSEWHEEL:
{
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if ( ! Fl::event_ctrl() )
return 0;
int d = Fl::event_dy();
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double z = _zoom;
if ( d < 0 )
while ( d++ )
_zoom /= 2;
else
while ( d-- )
_zoom *= 2;
constrain();
maybe_do_callback( z );
return 1;
}
default:
return Fl_Scrollbar::handle( m );
}
}
};