prh_base.h

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/*
 * Copyright (C) 2008-2025 David Robillard <d@drobilla.net>
 * Copyright (C) 2010-2012 Paul Davis <paul@linuxaudiosystems.com>
 *
 * 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.
 */
 
#pragma once
 
#include <pangomm/layout.h>
#include <glibmm/refptr.h>
 
#include "ardour/types.h"
 
#include "canvas/rectangle.h"
 
#include <ytkmm/adjustment.h>
 
namespace Gdk {
        class Window;
}
 
namespace ARDOUR {
        class MidiTrack;
}
 
class MidiView;
class MidiViewBackground;
class EditingContext;
 
class PianoRollHeaderBase : virtual public sigc::trackable {
  public:
        PianoRollHeaderBase (MidiViewBackground&);
        virtual ~PianoRollHeaderBase() {}
 
        void render (ArdourCanvas::Rect const & self, ArdourCanvas::Rect const & area, Cairo::RefPtr<Cairo::Context>) const;
 
        virtual void instrument_info_change ();
 
        void note_range_changed();
        void set_note_highlight (uint8_t note);
 
        sigc::signal<void,uint8_t> SetNoteSelection;
        sigc::signal<void,uint8_t> AddNoteSelection;
        sigc::signal<void,uint8_t> ToggleNoteSelection;
        sigc::signal<void,uint8_t> ExtendNoteSelection;
 
        void set_view (MidiView*);
 
        virtual void redraw () = 0;
        virtual void redraw (double x, double y, double w, double h) = 0;
        virtual double height() const = 0;
        virtual double width() const = 0;
        virtual double event_y_to_y (double evy) const = 0;
        virtual void draw_transform (double& x, double& y) const = 0;
        virtual void event_transform (double& x, double& y) const = 0;
        virtual void _queue_resize () = 0;
        virtual void do_grab() = 0;
        virtual void do_ungrab() = 0;
        virtual Glib::RefPtr<Gdk::Window> cursor_window() = 0;
        virtual std::shared_ptr<ARDOUR::MidiTrack> midi_track() = 0;
 
  protected:
        MidiViewBackground& _midi_context;
        Gtk::Adjustment&    _adj;
        MidiView*           _view;
 
        uint8_t             _event[3];
 
        mutable Glib::RefPtr<Pango::Layout> _layout;
        mutable Glib::RefPtr<Pango::Layout> _big_c_layout;
        mutable Glib::RefPtr<Pango::Layout> _midnam_layout;
        mutable Pango::FontDescription _font_descript;
        Pango::FontDescription _font_descript_big_c;
        mutable Pango::FontDescription _font_descript_midnam;
        bool _active_notes[128];
        uint8_t _highlighted_note;
        uint8_t _clicked_note;
        double _grab_y;
        bool _dragging;
        mutable double _scroomer_size;
        bool _scroomer_drag;
        double _old_y;
        double _fract;
        double _fract_top;
        double _min_page_size;
        enum scr_pos {TOP, BOTTOM, MOVE, NONE};
        scr_pos _scroomer_state;
        scr_pos _scroomer_button_state;
        double _saved_top_val;
        double _saved_bottom_val;
        mutable bool _mini_map_display;
        bool entered;
 
        // void on_size_request(Gtk::Requisition*);
 
        struct NoteName {
                std::string name;
                bool from_midnam;
        };
        NoteName note_names[128];
        bool have_note_names;
 
        void set_min_page_size (double page_size);
        void render_scroomer (Cairo::RefPtr<Cairo::Context>) const;
        NoteName get_note_name (int note);
 
        bool event_handler (GdkEvent*);
        bool motion_handler (GdkEventMotion*);
        bool button_press_handler (GdkEventButton*);
        bool button_release_handler (GdkEventButton*);
        bool scroll_handler (GdkEventScroll*);
        bool enter_handler (GdkEventCrossing*);
        bool leave_handler (GdkEventCrossing*);
 
        enum ItemType {
                BLACK_SEPARATOR,
                BLACK_MIDDLE_SEPARATOR,
                BLACK,
                WHITE_SEPARATOR,
                WHITE_RECT,
                WHITE_CF,
                WHITE_EB,
                WHITE_DGA
        };
 
        void invalidate_note_range (int lowest, int highest);
        void send_note_on (uint8_t note);
        void send_note_off (uint8_t note);
        void reset_clicked_note (uint8_t, bool invalidate = true);
        bool show_scroomer () const;
        void alloc_layouts (Glib::RefPtr<Pango::Context>);
        void set_cursor (Gdk::Cursor*);
};