crossfade_edit.h

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/*
    Copyright (C) 2000-2007 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 __gtk_ardour_xfade_edit_h__
#define __gtk_ardour_xfade_edit_h__

#include <list>

#include <gtkmm/box.h>
#include <gtkmm/button.h>
#include <gtkmm/radiobutton.h>

#include "canvas/canvas.h"

#include "evoral/Curve.hpp"
#include "ardour/session_handle.h"

#include "ardour_dialog.h"

namespace ARDOUR
{
        class Session;
        class AutomationList;
        class Crossfade;
}

namespace ArdourCanvas {
        class Rectangle;
        class Line;
        class Polygon;
        class WaveView;
}

class CrossfadeEditor : public ArdourDialog
{
  public:
        CrossfadeEditor (ARDOUR::Session*, boost::shared_ptr<ARDOUR::Crossfade>, double miny, double maxy);
        ~CrossfadeEditor ();

        void apply ();

        static const double canvas_border;

        /* these are public so that a caller/subclass can make them do the right thing.
         */

        Gtk::Button* cancel_button;
        Gtk::Button* ok_button;

        struct PresetPoint {
            double x;
            double y;

            PresetPoint (double a, double b)
                    : x (a), y (b) {}
        };

        struct Preset : public std::list<PresetPoint> {
            const char* name;
            const char* image_name;

            Preset (const char* n, const char* x) : name (n), image_name (x) {}
        };

        typedef std::list<Preset*> Presets;

        static Presets* fade_in_presets;
        static Presets* fade_out_presets;

  protected:
        bool on_key_press_event (GdkEventKey*);
        bool on_key_release_event (GdkEventKey*);

  private:
        boost::shared_ptr<ARDOUR::Crossfade> xfade;

        Gtk::VBox vpacker;

        struct Point {
            ~Point();

            ArdourCanvas::Rectangle* box;
            ArdourCanvas::PolyLine* curve;
            double x;
            double y;

            static const int32_t size;

            void move_to (double x, double y, double xfract, double yfract);
        };

        struct PointSorter {
            bool operator() (const CrossfadeEditor::Point* a, const CrossfadeEditor::Point *b) {
                    return a->x < b->x;
            }
        };

        ArdourCanvas::Rectangle*   toplevel;
        ArdourCanvas::GtkCanvas* canvas;

        struct Half {
            ArdourCanvas::PolyLine* line;
            ArdourCanvas::Polygon*  shading;
            std::list<Point*>       points;
            ARDOUR::AutomationList  normative_curve; /* 0 - 1.0, linear */
            ARDOUR::AutomationList  gain_curve;      /* 0 - 2.0, gain mapping */
            std::vector<ArdourCanvas::WaveView*>  waves;

            Half();
        };

        enum WhichFade {
                In = 0,
                Out = 1
        };

        Half fade[2];
        WhichFade current;

        bool point_grabbed;
        std::vector<Gtk::Button*> fade_out_buttons;
        std::vector<Gtk::Button*> fade_in_buttons;

        Gtk::VBox vpacker2;

        Gtk::Button clear_button;
        Gtk::Button revert_button;

        Gtk::ToggleButton audition_both_button;
        Gtk::ToggleButton audition_left_dry_button;
        Gtk::ToggleButton audition_left_button;
        Gtk::ToggleButton audition_right_dry_button;
        Gtk::ToggleButton audition_right_button;

        Gtk::ToggleButton preroll_button;
        Gtk::ToggleButton postroll_button;

        Gtk::HBox roll_box;

        gint event_handler (GdkEvent*);

        bool canvas_event (GdkEvent* event);
        bool point_event (GdkEvent* event, Point*);
        bool curve_event (GdkEvent* event);

        void canvas_allocation (Gtk::Allocation&);
        void add_control_point (double x, double y);
        Point* make_point ();
        void redraw ();

        double effective_width () const { return canvas->get_allocation().get_width() - (2.0 * canvas_border); }
        double effective_height () const { return canvas->get_allocation().get_height() - (2.0 * canvas_border); }

        void clear ();
        void reset ();

        double miny;
        double maxy;

        Gtk::Table fade_in_table;
        Gtk::Table fade_out_table;

        void build_presets ();
        void apply_preset (Preset*);

        Gtk::RadioButton select_in_button;
        Gtk::RadioButton select_out_button;
        Gtk::HBox   curve_button_box;
        Gtk::HBox   audition_box;

        void curve_select_clicked (WhichFade);

        double x_coordinate (double& xfract) const;
        double y_coordinate (double& yfract) const;

        void set (const ARDOUR::AutomationList& alist, WhichFade);

        PBD::ScopedConnection* _peaks_ready_connection;
        PBD::ScopedConnection state_connection;

        void make_waves (boost::shared_ptr<ARDOUR::AudioRegion>, WhichFade);
        void peaks_ready (boost::weak_ptr<ARDOUR::AudioRegion> r, WhichFade);

        void _apply_to (boost::shared_ptr<ARDOUR::Crossfade> xf);
        void setup (boost::shared_ptr<ARDOUR::Crossfade>);
        void cancel_audition ();
        void audition_state_changed (bool);

        enum Audition {
                Both,
                Left,
                Right
        };

        void audition_toggled ();
        void audition_right_toggled ();
        void audition_right_dry_toggled ();
        void audition_left_toggled ();
        void audition_left_dry_toggled ();

        void audition (Audition);
        void audition_both ();
        void audition_left_dry ();
        void audition_left ();
        void audition_right_dry ();
        void audition_right ();

        void xfade_changed (const PBD::PropertyChange&);

        void dump ();
};

#endif /* __gtk_ardour_xfade_edit_h__ */