note_base.cc

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/*
    Copyright (C) 2007 Paul Davis
    Author: David Robillard

    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.
*/

#include <iostream>

#include "gtkmm2ext/keyboard.h"

#include "evoral/Note.hpp"

#include "canvas/text.h"

#include "note_base.h"
#include "public_editor.h"
#include "editing_syms.h"
#include "keyboard.h"
#include "midi_region_view.h"

using namespace std;
using namespace Gtkmm2ext;
using ARDOUR::MidiModel;
using namespace ArdourCanvas;

PBD::Signal1<void,NoteBase*> NoteBase::NoteBaseDeleted;

const uint32_t NoteBase::midi_channel_colors[16] = {
          0xd32d2dff,  0xd36b2dff,  0xd3972dff,  0xd3d12dff,
          0xa0d32dff,  0x7dd32dff,  0x2dd45eff,  0x2dd3c4ff,
          0x2da5d3ff,  0x2d6fd3ff,  0x432dd3ff,  0x662dd3ff,
          0x832dd3ff,  0xa92dd3ff,  0xd32dbfff,  0xd32d67ff
        };

NoteBase::NoteBase(MidiRegionView& region, bool with_events, const boost::shared_ptr<NoteType> note)
        : _region(region)
        , _item (0)
        , _text(0)
        , _state(None)
        , _note(note)
        , _with_events (with_events)
        , _selected(false)
        , _valid (true)
        , _mouse_x_fraction (-1.0)
        , _mouse_y_fraction (-1.0)
{
}

NoteBase::~NoteBase()
{
        NoteBaseDeleted (this);

        delete _text;
}

void
NoteBase::set_item (Item* item)
{
        _item = item;
        _item->set_data ("notebase", this);

        if (_with_events) {
                _item->Event.connect (sigc::mem_fun (*this, &NoteBase::event_handler));
        }
}

void
NoteBase::invalidate ()
{
        _valid = false;
}

void
NoteBase::validate ()
{
        _valid = true;
}

void
NoteBase::show_velocity()
{
        if (!_text) {
                _text = new Text (_item->parent ());
                _text->set_ignore_events (true);
                _text->set_color (ARDOUR_UI::config()->color_mod ("midi note velocity text", "midi note velocity text"));
                _text->set_alignment (Pango::ALIGN_CENTER);
        }

        _text->set_x_position ((x0() + x1()) / 2);
        _text->set_y_position ((y0() + y1()) / 2);
        ostringstream velo(ios::ate);
        velo << int(_note->velocity());
        _text->set (velo.str ());
        _text->show();
        _text->raise_to_top();
}

void
NoteBase::hide_velocity()
{
        delete _text;
        _text = 0;
}

void
NoteBase::on_channel_selection_change(uint16_t selection)
{
        // make note change its color if its channel is not marked active
        if ( (selection & (1 << _note->channel())) == 0 ) {
                set_fill_color(ARDOUR_UI::config()->color ("midi note inactive channel"));
                set_outline_color(calculate_outline(ARDOUR_UI::config()->color ("midi note inactive channel"),
                                                    _selected));
        } else {
                // set the color according to the notes selection state
                set_selected(_selected);
        }
        // this forces the item to update..... maybe slow...
        _item->hide();
        _item->show();
}

void
NoteBase::on_channel_change(uint8_t channel)
{
        _region.note_selected(this, true);
        _region.change_channel(channel);
}

void
NoteBase::set_selected(bool selected)
{
        if (!_note) {
                return;
        }

        _selected = selected;
        set_fill_color (base_color());
        
        set_outline_color(calculate_outline(base_color(), _selected));
}

#define SCALE_USHORT_TO_UINT8_T(x) ((x) / 257)

uint32_t
NoteBase::base_color()
{
        using namespace ARDOUR;

        ColorMode mode = _region.color_mode();

        const uint8_t min_opacity = 15;
        uint8_t       opacity = std::max(min_opacity, uint8_t(_note->velocity() + _note->velocity()));

        switch (mode) {
        case TrackColor:
        {
                uint32_t color = _region.midi_stream_view()->get_region_color();
                return UINT_INTERPOLATE (UINT_RGBA_CHANGE_A (color, opacity), 
                                         ARDOUR_UI::config()->color ("midi note selected"), 
                                         0.5);
        }

        case ChannelColors:
                return UINT_INTERPOLATE (UINT_RGBA_CHANGE_A (NoteBase::midi_channel_colors[_note->channel()], opacity), 
                                         ARDOUR_UI::config()->color ("midi note selected"), 0.5);

        default:
                return meter_style_fill_color(_note->velocity(), selected());
        };

        return 0;
}

void
NoteBase::set_mouse_fractions (GdkEvent* ev)
{
        double ix, iy;
        bool set_cursor = false;

        switch (ev->type) {
        case GDK_MOTION_NOTIFY:
                ix = ev->motion.x;
                iy = ev->motion.y;
                set_cursor = true;
                break;
        case GDK_ENTER_NOTIFY:
                ix = ev->crossing.x;
                iy = ev->crossing.y;
                set_cursor = true;
                break;
        case GDK_BUTTON_PRESS:
        case GDK_BUTTON_RELEASE:
                ix = ev->button.x;
                iy = ev->button.y;
                break;
        default:
                _mouse_x_fraction = -1.0;
                _mouse_y_fraction = -1.0;
                return;
        }

        boost::optional<ArdourCanvas::Rect> bbox = _item->bounding_box ();
        assert (bbox);

        _item->canvas_to_item (ix, iy);
        /* XXX: CANVAS */
        /* hmm, something wrong here. w2i should give item-local coordinates
           but it doesn't. for now, finesse this.
        */
        ix = ix - bbox.get().x0;
        iy = iy - bbox.get().y0;

        /* fraction of width/height */
        double xf;
        double yf;
        bool notify = false;

        xf = ix / bbox.get().width ();
        yf = iy / bbox.get().height ();

        if (xf != _mouse_x_fraction || yf != _mouse_y_fraction) {
                notify = true;
        }

        _mouse_x_fraction = xf;
        _mouse_y_fraction = yf;

        if (notify) {
                if (big_enough_to_trim()) {
                        _region.note_mouse_position (_mouse_x_fraction, _mouse_y_fraction, set_cursor);
                } else {
                        /* pretend the mouse is in the middle, because this is not big enough
                           to trim right now.
                        */
                        _region.note_mouse_position (0.5, 0.5, set_cursor);
                }
        }
}

bool
NoteBase::event_handler (GdkEvent* ev)
{
        PublicEditor& editor = _region.get_time_axis_view().editor();
        if (!editor.internal_editing()) {
                return false;
        }

        switch (ev->type) {
        case GDK_ENTER_NOTIFY:
                _region.note_entered (this);
                set_mouse_fractions (ev);
                break;

        case GDK_LEAVE_NOTIFY:
                set_mouse_fractions (ev);
                _region.note_left (this);
                break;

        case GDK_MOTION_NOTIFY:
                set_mouse_fractions (ev);
                break;

        case GDK_BUTTON_PRESS:
                set_mouse_fractions (ev);
                break;

        case GDK_BUTTON_RELEASE:
                set_mouse_fractions (ev);
                break;

        default:
                break;
        }

        return editor.canvas_note_event (ev, _item);
}

bool
NoteBase::mouse_near_ends () const
{
        return (_mouse_x_fraction >= 0.0 && _mouse_x_fraction < 0.25) ||
                (_mouse_x_fraction >= 0.75 && _mouse_x_fraction < 1.0);
}

bool
NoteBase::big_enough_to_trim () const
{
        return (x1() - x0()) > 10;
}