scroomer.h

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/*
    Copyright (C) 2008 Paul Davis 

    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; if not, write to the Free Software
    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.

*/

#ifndef __gtkmm2ext_scroomer_h__ 
#define __gtkmm2ext_scroomer_h__

#include <gtkmm/drawingarea.h>
#include <gtkmm/adjustment.h>
#include <gdkmm.h>

#include "gtkmm2ext/visibility.h"

namespace Gtkmm2ext {

class LIBGTKMM2EXT_API Scroomer : public Gtk::DrawingArea
{
public:
        enum Component {
                TopBase = 0,
                Handle1 = 1,
                Slider = 2,
                Handle2 = 3,
                BottomBase = 4,
                Total = 5,
                None = 6
        };

        Scroomer(Gtk::Adjustment& adjustment);
        ~Scroomer();

        bool on_motion_notify_event (GdkEventMotion*);
        bool on_button_press_event (GdkEventButton*);
        bool on_button_release_event (GdkEventButton*);
        bool on_scroll_event (GdkEventScroll*);
        virtual void on_size_allocate (Gtk::Allocation&);

        void set_comp_rect(GdkRectangle&, Component) const;

        Component point_in(double point) const;

        void set_min_page_size(double page_size);
        int get_handle_size() { return handle_size; }
        
        inline int position_of(Component comp) { return position[comp]; }

        sigc::signal0<void> DragStarting;
        sigc::signal0<void> DragFinishing;

        sigc::signal0<void> DoubleClicked;

protected:
        Gtk::Adjustment& adj;

private:
        struct UpdateRect {
                GdkRectangle rect;
                Component first_comp;
        };

        void update();
        void adjustment_changed ();

        int position[6];
        int old_pos[6];
        int handle_size;
        double min_page_size;
        GdkWindow* grab_window;
        Component grab_comp;
        double grab_y;
        double unzoomed_val;
        double unzoomed_page;
        bool pinch;
};

} // namespace

#endif /* __gtkmm2ext_scroomer_h__ */