scroomer.h

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/*
 * Copyright (C) 2008 Paul Davis <paul@linuxaudiosystems.com>
 * Copyright (C) 2017 Robin Gareus <robin@gareus.org>
 *
 * 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.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */
 
#ifndef _WIDGETS_SCROOMER_H_
#define _WIDGETS_SCROOMER_H_
 
#include <gdkmm.h>
#include <gtkmm/drawingarea.h>
#include <gtkmm/adjustment.h>
 
#include "widgets/visibility.h"
 
namespace ArdourWidgets {
 
class LIBWIDGETS_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;
};
 
} /* end namespace */
 
#endif