108 lines
3.4 KiB
C++
108 lines
3.4 KiB
C++
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/*******************************************************************************/
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/* Copyright (C) 2008 Jonathan Moore Liles */
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/* */
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/* This program is free software; you can redistribute it and/or modify it */
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/* under the terms of the GNU General Public License as published by the */
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/* Free Software Foundation; either version 2 of the License, or (at your */
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/* option) any later version. */
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/* */
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/* This program is distributed in the hope that it will be useful, but WITHOUT */
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/* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or */
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/* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for */
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/* more details. */
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/* */
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/* You should have received a copy of the GNU General Public License along */
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/* with This program; see the file COPYING. If not,write to the Free Software */
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/* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
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/*******************************************************************************/
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#pragma once
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#include <FL/Fl.H>
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#include <FL/Fl_Scrollbar.H>
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#include <FL/Fl_Slider.H>
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#include <stdio.h>
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class Scalebar : public Fl_Scrollbar
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{
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int _zoom;
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bool _zoom_changed;
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int _zoom_min;
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int _zoom_max;
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void constrain ( void )
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{
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if ( _zoom > _zoom_max )
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_zoom = _zoom_max;
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else
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if ( _zoom < _zoom_min )
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_zoom = _zoom_min;
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}
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void maybe_do_callback ( int z )
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{
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if ( z != _zoom )
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{
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_zoom_changed = true;
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do_callback();
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_zoom_changed = false;
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slider_size( w() / maximum() );
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}
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}
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public:
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Scalebar ( int X, int Y, int W, int H ) : Fl_Scrollbar ( X, Y, W, H )
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{
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_zoom = 1;
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_zoom_min = 0;
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_zoom_max = 4;
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_zoom_changed = false;
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step( 1 );
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}
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bool zoom_changed ( void ) const { return _zoom_changed; }
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double zoom ( void ) const { return _zoom; }
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void zoom ( int v ) { int z = _zoom ; _zoom = v; constrain(); maybe_do_callback( z ); }
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// double value ( void ) const { return Fl_Slider::value(); }
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void zoom_range ( int zmin, int zmax ) { _zoom_min = zmin; _zoom_max = zmax; }
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void zoom_out ( void ) { int z = _zoom; ++_zoom; constrain(); maybe_do_callback( z ); }
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void zoom_in ( void ) {int z = _zoom; --_zoom; constrain(); maybe_do_callback( z ); }
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int
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handle ( int m )
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{
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switch ( m )
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{
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case FL_MOUSEWHEEL:
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{
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if ( ! Fl::event_ctrl() )
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return 0;
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int d = Fl::event_dy();
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double z = _zoom;
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_zoom += d;
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constrain();
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maybe_do_callback( z );
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return 1;
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}
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default:
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return Fl_Scrollbar::handle( m );
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}
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}
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};
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