gtk2_ardour/canvas-note-event.h

   1 /*
   2     Copyright (C) 2007 Paul Davis
   3     Author: David Robillard
   4
   5     This program is free software; you can redistribute it and/or modify
   6     it under the terms of the GNU General Public License as published by
   7     the Free Software Foundation; either version 2 of the License, or
   8     (at your option) any later version.
   9
  10     This program is distributed in the hope that it will be useful,
  11     but WITHOUT ANY WARRANTY; without even the implied warranty of
  12     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13     GNU General Public License for more details.
  14
  15     You should have received a copy of the GNU General Public License
  16     along with this program; if not, write to the Free Software
  17     Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  18 */
  19
  20 #ifndef __gtk_ardour_canvas_midi_event_h__
  21 #define __gtk_ardour_canvas_midi_event_h__
  22
  23 #include <boost/shared_ptr.hpp>
  24 #include <libgnomecanvasmm/text.h>
  25 #include <libgnomecanvasmm/widget.h>
  26
  27 #include "ardour/midi_model.h"
  28
  29 #include "rgb_macros.h"
  30 #include "ardour_ui.h"
  31 #include "canvas-noevent-text.h"
  32 #include "ui_config.h"
  33
  34 class Editor;
  35 class MidiRegionView;
  36
  37 namespace Evoral { template<typename T> class Note; }
  38
  39 namespace Gnome {
  40 namespace Canvas {
  41
  42
  43 /** This manages all the event handling for any MIDI event on the canvas.
  44  *
  45  * This is not actually a canvas item itself to avoid the dreaded diamond,
  46  * since various types of canvas items (Note (rect), Hit (diamond), etc)
  47  * need to share this functionality but can't share an ancestor.
  48  *
  49  * Note: Because of this, derived classes need to manually bounce events to
  50  * on_event, it won't happen automatically.
  51  *
  52  * A newer, better canvas should remove the need for all the ugly here.
  53  */
  54 class CanvasNoteEvent : virtual public sigc::trackable
  55 {
  56   public:
  57         typedef Evoral::Note<ARDOUR::MidiModel::TimeType> NoteType;
  58
  59         CanvasNoteEvent(
  60                         MidiRegionView&                   region,
  61                         Item*                             item,
  62                         const boost::shared_ptr<NoteType> note = boost::shared_ptr<NoteType>());
  63
  64         virtual ~CanvasNoteEvent();
  65
  66         static PBD::Signal1<void,CanvasNoteEvent*> CanvasNoteEventDeleted;
  67
  68         virtual void show() = 0;
  69         virtual void hide() = 0;
  70         virtual bool on_event(GdkEvent* ev);
  71
  72         bool valid() const { return _valid; }
  73         void invalidate ();
  74         void validate ();
  75
  76         bool selected() const { return _selected; }
  77         void set_selected(bool yn);
  78
  79         virtual void move_event(double dx, double dy) = 0;
  80
  81         uint32_t base_color();
  82
  83         void show_velocity();
  84         void hide_velocity();
  85
  86         /** Channel changed for this specific event */
  87         void on_channel_change(uint8_t channel);
  88
  89         /** Channel selection changed */
  90         void on_channel_selection_change(uint16_t selection);
  91
  92         void show_channel_selector();
  93         void hide_channel_selector();
  94
  95         virtual void set_outline_color(uint32_t c) = 0;
  96         virtual void set_fill_color(uint32_t c) = 0;
  97
  98         virtual double x1() const = 0;
  99         virtual double y1() const = 0;
 100         virtual double x2() const = 0;
 101         virtual double y2() const = 0;
 102
 103         float mouse_x_fraction() const { return _mouse_x_fraction; }
 104         float mouse_y_fraction() const { return _mouse_y_fraction; }
 105
 106         const boost::shared_ptr<NoteType> note() const { return _note; }
 107         MidiRegionView& region_view() const { return _region; }
 108
 109         inline static uint32_t meter_style_fill_color(uint8_t vel, bool selected) {
 110                 if (selected) {
 111                         if (vel < 64) {
 112                                 return UINT_INTERPOLATE(
 113                                         ARDOUR_UI::config()->canvasvar_SelectedMidiNoteColorBase.get(),
 114                                         ARDOUR_UI::config()->canvasvar_SelectedMidiNoteColorMid.get(),
 115                                         (vel / (double)63.0));
 116                         } else {
 117                                 return UINT_INTERPOLATE(
 118                                         ARDOUR_UI::config()->canvasvar_SelectedMidiNoteColorMid.get(),
 119                                         ARDOUR_UI::config()->canvasvar_SelectedMidiNoteColorTop.get(),
 120                                         ((vel-64) / (double)63.0));
 121                         }
 122                 } else {
 123                         if (vel < 64) {
 124                                 return UINT_INTERPOLATE(
 125                                         ARDOUR_UI::config()->canvasvar_MidiNoteColorBase.get(),
 126                                         ARDOUR_UI::config()->canvasvar_MidiNoteColorMid.get(),
 127                                         (vel / (double)63.0));
 128                         } else {
 129                                 return UINT_INTERPOLATE(
 130                                         ARDOUR_UI::config()->canvasvar_MidiNoteColorMid.get(),
 131                                         ARDOUR_UI::config()->canvasvar_MidiNoteColorTop.get(),
 132                                         ((vel-64) / (double)63.0));
 133                         }
 134                 }
 135         }
 136
 137         /// calculate outline colors from fill colors of notes
 138         inline static uint32_t calculate_outline(uint32_t color) {
 139                 return UINT_INTERPOLATE(color, 0x000000ff, 0.5);
 140         }
 141
 142         /// hue circle divided into 16 equal-looking parts, courtesy Thorsten Wilms
 143         static const uint32_t midi_channel_colors[16];
 144
 145         bool mouse_near_ends () const;
 146         bool big_enough_to_trim () const;
 147
 148   protected:
 149         enum State { None, Pressed, Dragging };
 150
 151         MidiRegionView&                   _region;
 152         Item* const                       _item;
 153         NoEventText*                      _text;
 154         Widget*                           _channel_selector_widget;
 155         State                             _state;
 156         const boost::shared_ptr<NoteType> _note;
 157         bool                              _own_note;
 158         bool                              _selected;
 159         bool                              _valid;
 160         float                             _mouse_x_fraction;
 161         float                             _mouse_y_fraction;
 162
 163         void set_mouse_fractions (GdkEvent*);
 164 };
 165
 166 } // namespace Gnome
 167 } // namespace Canvas
 168
 169 #endif /* __gtk_ardour_canvas_midi_event_h__ */