gtk2_ardour/canvas-note-event.h

   1 /*
   2     Copyright (C) 2007 Paul Davis
   3     Author: Dave 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 "ui_config.h"
  32 #include "interactive-item.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, public InteractiveItem {
  55 public:
  56         typedef Evoral::Note<ARDOUR::MidiModel::TimeType> NoteType;
  57
  58         CanvasNoteEvent(
  59                         MidiRegionView&                   region,
  60                         Item*                             item,
  61                         const boost::shared_ptr<NoteType> note = boost::shared_ptr<NoteType>());
  62
  63         virtual ~CanvasNoteEvent();
  64
  65         static PBD::Signal1<void,CanvasNoteEvent*> CanvasNoteEventDeleted;
  66
  67         virtual void show() = 0;
  68         virtual void hide() = 0;
  69         virtual bool on_event(GdkEvent* ev);
  70
  71         bool valid() const { return _valid; }
  72         void invalidate ();
  73         void validate ();
  74
  75         bool selected() const { return _selected; }
  76         void selected(bool yn);
  77
  78         virtual void move_event(double dx, double dy) = 0;
  79
  80         uint32_t base_color();
  81
  82         void show_velocity();
  83         void hide_velocity();
  84
  85         /** Channel changed for this specific event */
  86         void on_channel_change(uint8_t channel);
  87
  88         /** Channel selection changed */
  89         void on_channel_selection_change(uint16_t selection);
  90
  91         void show_channel_selector();
  92         void hide_channel_selector();
  93
  94         virtual void set_outline_color(uint32_t c) = 0;
  95         virtual void set_fill_color(uint32_t c) = 0;
  96
  97         virtual double x1() = 0;
  98         virtual double y1() = 0;
  99         virtual double x2() = 0;
 100         virtual double y2() = 0;
 101
 102         const boost::shared_ptr<NoteType> note() const { return _note; }
 103         MidiRegionView& region_view() const { return _region; }
 104
 105         inline static uint32_t meter_style_fill_color(uint8_t vel) {
 106                 if (vel < 64) {
 107                         return UINT_INTERPOLATE(
 108                                         ARDOUR_UI::config()->canvasvar_MidiNoteMeterColorBase.get(),
 109                                         ARDOUR_UI::config()->canvasvar_MidiNoteMeterColorMid.get(),
 110                                         (vel / (double)63.0));
 111                 } else {
 112                         return UINT_INTERPOLATE(
 113                                         ARDOUR_UI::config()->canvasvar_MidiNoteMeterColorMid.get(),
 114                                         ARDOUR_UI::config()->canvasvar_MidiNoteMeterColorTop.get(),
 115                                         ((vel-64) / (double)63.0));
 116                 }
 117         }
 118
 119         /// calculate outline colors from fill colors of notes
 120         inline static uint32_t calculate_outline(uint32_t color) {
 121                 return UINT_INTERPOLATE(color, 0x000000ff, 0.5);
 122         }
 123
 124         /// hue circle divided into 16 equal-looking parts, courtesy Thorsten Wilms
 125         static const uint32_t midi_channel_colors[16];
 126
 127 protected:
 128         enum State { None, Pressed, Dragging };
 129
 130         MidiRegionView&                   _region;
 131         Item* const                       _item;
 132         InteractiveText*                  _text;
 133         Widget*                           _channel_selector_widget;
 134         State                             _state;
 135         const boost::shared_ptr<NoteType> _note;
 136         bool                              _own_note;
 137         bool                              _selected;
 138         bool                              _valid;
 139 };
 140
 141 } // namespace Gnome
 142 } // namespace Canvas
 143
 144 #endif /* __gtk_ardour_canvas_midi_event_h__ */