PatternEditor.cpp

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/*
 * Hydrogen
 * Copyright(c) 2002-2008 by the Hydrogen Team
 * Copyright(c) 2008-2024 The hydrogen development team [hydrogen-devel@lists.sourceforge.net]
 *
 * http://www.hydrogen-music.org
 *
 * 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, see https://www.gnu.org/licenses
 *
 */
 
#include "PatternEditor.h"
#include "PatternEditorRuler.h"
#include "PatternEditorInstrumentList.h"
#include "PatternEditorPanel.h"
#include "../CommonStrings.h"
#include "../HydrogenApp.h"
#include "../EventListener.h"
#include "../UndoActions.h"
#include "../Skin.h"
 
#include <core/Globals.h>
#include <core/Basics/Song.h>
#include <core/Hydrogen.h>
#include <core/Preferences/Preferences.h>
#include <core/EventQueue.h>
#include <core/Basics/DrumkitComponent.h>
#include <core/Basics/Instrument.h>
#include <core/Basics/InstrumentList.h>
#include <core/Basics/InstrumentComponent.h>
#include <core/Basics/Pattern.h>
#include <core/Basics/PatternList.h>
#include <core/Basics/Adsr.h>
#include <core/Basics/Note.h>
#include <core/AudioEngine/AudioEngine.h>
#include <core/Helpers/Xml.h>
 
 
using namespace std;
using namespace H2Core;
 
 
PatternEditor::PatternEditor( QWidget *pParent,
                                                          PatternEditorPanel *panel )
        : Object()
        , QWidget( pParent )
        , m_selection( this )
        , m_bEntered( false )
        , m_nResolution( 8 )
        , m_bUseTriplets( false )
        , m_pDraggedNote( nullptr )
        , m_pPatternEditorPanel( panel )
        , m_pPattern( nullptr )
        , m_bSelectNewNotes( false )
        , m_bFineGrained( false )
        , m_bCopyNotMove( false )
        , m_nTick( -1 )
        , m_editor( Editor::None )
        , m_mode( Mode::None )
{
 
        auto pPref = H2Core::Preferences::get_instance();
        
        m_fGridWidth = pPref->getPatternEditorGridWidth();
        m_nEditorWidth = PatternEditor::nMargin + m_fGridWidth * ( MAX_NOTES * 4 );
        m_nActiveWidth = m_nEditorWidth;
 
        setFocusPolicy(Qt::StrongFocus);
 
        HydrogenApp::get_instance()->addEventListener( this );
        connect( HydrogenApp::get_instance(), &HydrogenApp::preferencesChanged, this, &PatternEditor::onPreferencesChanged );
        
        m_pAudioEngine = Hydrogen::get_instance()->getAudioEngine();
 
        // Popup context menu
        m_pPopupMenu = new QMenu( this );
        m_pPopupMenu->addAction( tr( "&Cut" ), this, SLOT( cut() ) );
        m_pPopupMenu->addAction( tr( "&Copy" ), this, SLOT( copy() ) );
        m_pPopupMenu->addAction( tr( "&Paste" ), this, SLOT( paste() ) );
        m_pPopupMenu->addAction( tr( "&Delete" ), this, SLOT( deleteSelection() ) );
        m_pPopupMenu->addAction( tr( "Select &all" ), this, SLOT( selectAll() ) );
        m_pPopupMenu->addAction( tr( "Clear selection" ), this, SLOT( selectNone() ) );
 
        qreal pixelRatio = devicePixelRatio();
        m_pBackgroundPixmap = new QPixmap( m_nEditorWidth * pixelRatio,
                                                                           height() * pixelRatio );
        m_pBackgroundPixmap->setDevicePixelRatio( pixelRatio );
        m_bBackgroundInvalid = true;
}
 
PatternEditor::~PatternEditor()
{
        if ( m_pBackgroundPixmap ) {
                delete m_pBackgroundPixmap;
        }
}
 
void PatternEditor::onPreferencesChanged( H2Core::Preferences::Changes changes )
{
        if ( changes & H2Core::Preferences::Changes::Colors ) {
                
                update( 0, 0, width(), height() );
                m_pPatternEditorPanel->updateEditors();
        }
}
 
void PatternEditor::setResolution(uint res, bool bUseTriplets)
{
        this->m_nResolution = res;
        this->m_bUseTriplets = bUseTriplets;
 
        // redraw all
        update( 0, 0, width(), height() );
        m_pPatternEditorPanel->updateEditors();
}
 
void PatternEditor::zoomIn()
{
        if (m_fGridWidth >= 3) {
                m_fGridWidth *= 2;
        } else {
                m_fGridWidth *= 1.5;
        }
        updateEditor();
}
 
void PatternEditor::zoomOut()
{
        if ( m_fGridWidth > 1.5 ) {
                if (m_fGridWidth > 3) {
                        m_fGridWidth /= 2;
                } else {
                        m_fGridWidth /= 1.5;
                }
                updateEditor();
        }
}
 
QColor PatternEditor::computeNoteColor( float fVelocity ) {
        float fRed, fGreen, fBlue;
 
        auto pPref = H2Core::Preferences::get_instance();
 
        QColor fullColor = pPref->getColorTheme()->m_patternEditor_noteVelocityFullColor;
        QColor defaultColor = pPref->getColorTheme()->m_patternEditor_noteVelocityDefaultColor;
        QColor halfColor = pPref->getColorTheme()->m_patternEditor_noteVelocityHalfColor;
        QColor zeroColor = pPref->getColorTheme()->m_patternEditor_noteVelocityZeroColor;
 
        // The colors defined in the Preferences correspond to fixed
        // velocity values. In case the velocity lies between two of those
        // the corresponding colors will be interpolated.
        float fWeightFull = 0;
        float fWeightDefault = 0;
        float fWeightHalf = 0;
        float fWeightZero = 0;
 
        if ( fVelocity >= 1.0 ) {
                fWeightFull = 1.0;
        } else if ( fVelocity >= 0.8 ) {
                fWeightDefault = ( 1.0 - fVelocity )/ ( 1.0 - 0.8 );
                fWeightFull = 1.0 - fWeightDefault;
        } else if ( fVelocity >= 0.5 ) {
                fWeightHalf = ( 0.8 - fVelocity )/ ( 0.8 - 0.5 );
                fWeightDefault = 1.0 - fWeightHalf;
        } else {
                fWeightZero = ( 0.5 - fVelocity )/ ( 0.5 );
                fWeightHalf = 1.0 - fWeightZero;
        }
 
        fRed = fWeightFull * fullColor.redF() +
                fWeightDefault * defaultColor.redF() +
                fWeightHalf * halfColor.redF() + fWeightZero * zeroColor.redF();
        fGreen = fWeightFull * fullColor.greenF() +
                fWeightDefault * defaultColor.greenF() +
                fWeightHalf * halfColor.greenF() + fWeightZero * zeroColor.greenF();
        fBlue = fWeightFull * fullColor.blueF() +
                fWeightDefault * defaultColor.blueF() +
                fWeightHalf * halfColor.blueF() + fWeightZero * zeroColor.blueF();
 
        QColor color;
        color.setRedF( fRed );
        color.setGreenF( fGreen );
        color.setBlueF( fBlue );
        
        return color;
}
 
 
void PatternEditor::drawNoteSymbol( QPainter &p, QPoint pos, H2Core::Note *pNote, bool bIsForeground ) const
{
        if ( m_pPattern == nullptr ) {
                return;
        }
 
        auto pPref = H2Core::Preferences::get_instance();
        
        const QColor noteColor( pPref->getColorTheme()->m_patternEditor_noteVelocityDefaultColor );
        const QColor noteInactiveColor( pPref->getColorTheme()->m_windowTextColor.darker( 150 ) );
        const QColor noteoffColor( pPref->getColorTheme()->m_patternEditor_noteOffColor );
        const QColor noteoffInactiveColor( pPref->getColorTheme()->m_windowTextColor );
 
        p.setRenderHint( QPainter::Antialiasing );
 
        QColor color = computeNoteColor( pNote->get_velocity() );
 
        uint w = 8, h =  8;
        uint x_pos = pos.x(), y_pos = pos.y();
 
        bool bSelected = m_selection.isSelected( pNote );
 
        if ( bSelected ) {
                QPen selectedPen( selectedNoteColor() );
                selectedPen.setWidth( 2 );
                p.setPen( selectedPen );
                p.setBrush( Qt::NoBrush );
        }
 
        bool bMoving = bSelected && m_selection.isMoving();
        QPen movingPen( noteColor );
        QPoint movingOffset;
 
        if ( bMoving ) {
                movingPen.setStyle( Qt::DotLine );
                movingPen.setWidth( 2 );
                QPoint delta = movingGridOffset();
                movingOffset = QPoint( delta.x() * m_fGridWidth,
                                                           delta.y() * m_nGridHeight );
        }
 
        if ( pNote->get_note_off() == false ) { // trigger note
                int width = w;
 
                QBrush noteBrush( color );
                QPen notePen( noteColor );
                if ( !bIsForeground ) {
 
                        if ( x_pos >= m_nActiveWidth ) {
                                noteBrush.setColor( noteInactiveColor );
                                notePen.setColor( noteInactiveColor );
                        }
                        
                        noteBrush.setStyle( Qt::Dense4Pattern );
                        notePen.setStyle( Qt::DotLine );
                }
 
                if ( bSelected ) {
                        p.drawEllipse( x_pos -4 -2, y_pos-2, w+4, h+4 );
                }
 
                // Draw tail
                if ( pNote->get_length() != -1 ) {
                        float fNotePitch = pNote->get_octave() * 12 + pNote->get_key();
                        float fStep = Note::pitchToFrequency( ( double )fNotePitch );
 
                        // if there is a stop-note to the right of this note, only draw-
                        // its length till there.
                        int nLength = pNote->get_length();
                        auto notes = m_pPattern->get_notes();
                        for ( const auto& [ _, ppNote ] : *m_pPattern->get_notes() ) {
                                if ( ppNote != nullptr &&
                                         // noteOff note
                                         ppNote->get_note_off() &&
                                         // located in the same row
                                         ppNote->get_instrument() == pNote->get_instrument() &&
                                         // left of the NoteOff
                                         pNote->get_position() < ppNote->get_position() &&
                                         // custom length reaches beyond NoteOff
                                         pNote->get_position() + pNote->get_length() >
                                         ppNote->get_position() ) {
                                        // In case there are multiple stop-notes present, take the
                                        // shortest distance.
                                        nLength = std::min( ppNote->get_position() - pNote->get_position(), nLength );
                                }
                        }
 
                        width = m_fGridWidth * nLength / fStep;
                        width = width - 1;      // lascio un piccolo spazio tra una nota ed un altra
 
                        if ( bSelected ) {
                                p.drawRoundedRect( x_pos-2, y_pos, width+4, 3+4, 4, 4 );
                        }
                        p.setPen( notePen );
                        p.setBrush( noteBrush );
 
                        // Since the note body is transparent for an inactive note, we try
                        // to start the tail at its boundary. For regular notes we do not
                        // care about an overlap, as it ensures that there are no white
                        // artifacts between tail and note body regardless of the scale
                        // factor.
                        int nRectOnsetX = x_pos;
                        int nRectWidth = width;
                        if ( ! bIsForeground ) {
                                nRectOnsetX = nRectOnsetX + w/2;
                                nRectWidth = nRectWidth - w/2;
                        }
 
                        p.drawRect( nRectOnsetX, y_pos +2, nRectWidth, 3 );
                        p.drawLine( x_pos+width, y_pos, x_pos+width, y_pos + h );
                }
 
                p.setPen( notePen );
                p.setBrush( noteBrush );
                p.drawEllipse( x_pos -4 , y_pos, w, h );
 
                if ( bMoving ) {
                        p.setPen( movingPen );
                        p.setBrush( Qt::NoBrush );
                        p.drawEllipse( movingOffset.x() + x_pos -4 -2, movingOffset.y() + y_pos -2 , w + 4, h + 4 );
                        // Moving tail
                        if ( pNote->get_length() != -1 ) {
                                p.setPen( movingPen );
                                p.setBrush( Qt::NoBrush );
                                p.drawRoundedRect( movingOffset.x() + x_pos-2, movingOffset.y() + y_pos, width+4, 3+4, 4, 4 );
                        }
                }
        }
        else if ( pNote->get_length() == 1 && pNote->get_note_off() == true ) {
 
                QBrush noteOffBrush( noteoffColor );
                if ( !bIsForeground ) {
                        noteOffBrush.setStyle( Qt::Dense4Pattern );
 
                        if ( x_pos >= m_nActiveWidth ) {
                                noteOffBrush.setColor( noteoffInactiveColor );
                        }
                }
 
                if ( bSelected ) {
                        p.drawEllipse( x_pos -4 -2, y_pos-2, w+4, h+4 );
                }
 
                p.setPen( Qt::NoPen );
                p.setBrush( noteOffBrush );
                p.drawEllipse( x_pos -4 , y_pos, w, h );
 
                if ( bMoving ) {
                        p.setPen( movingPen );
                        p.setBrush( Qt::NoBrush );
                        p.drawEllipse( movingOffset.x() + x_pos -4 -2, movingOffset.y() + y_pos -2, w + 4, h + 4 );
                }
        }
}
 
 
int PatternEditor::getColumn( int x, bool bUseFineGrained ) const
{
        int nGranularity = 1;
        if ( !( bUseFineGrained && m_bFineGrained ) ) {
                nGranularity = granularity();
        }
        int nWidth = m_fGridWidth * nGranularity;
        int nColumn = ( x - PatternEditor::nMargin + (nWidth / 2) ) / nWidth;
        nColumn = nColumn * nGranularity;
        if ( nColumn < 0 ) {
                return 0;
        } else {
                return nColumn;
        }
}
 
void PatternEditor::selectNone()
{
        m_selection.clearSelection();
        m_selection.updateWidgetGroup();
}
 
void PatternEditor::copy()
{
        Hydrogen *pHydrogen = Hydrogen::get_instance();
        auto pInstrumentList = pHydrogen->getSong()->getInstrumentList();
        XMLDoc doc;
        XMLNode selection = doc.set_root( "noteSelection" );
        XMLNode noteList = selection.createNode( "noteList");
        XMLNode positionNode = selection.createNode( "sourcePosition" );
        bool bWroteNote = false;
        // "Top left" of selection, in the three dimensional time*instrument*pitch space.
        int nLowestPos, nLowestInstrument, nHighestPitch;
 
        for ( Note *pNote : m_selection ) {
                int nPitch = pNote->get_notekey_pitch() + 12*OCTAVE_OFFSET;
                int nPos = pNote->get_position();
                int nInstrument = pInstrumentList->index( pNote->get_instrument() );
                if ( bWroteNote ) {
                        nLowestPos = std::min( nPos, nLowestPos );
                        nLowestInstrument = std::min( nInstrument, nLowestInstrument );
                        nHighestPitch = std::max( nPitch, nHighestPitch );
                } else {
                        nLowestPos = nPos;
                        nLowestInstrument = nInstrument;
                        nHighestPitch = nPitch;
                        bWroteNote = true;
                }
                XMLNode note_node = noteList.createNode( "note" );
                pNote->save_to( &note_node );
        }
 
        if ( bWroteNote ) {
                positionNode.write_int( "position", nLowestPos );
                positionNode.write_int( "instrument", nLowestInstrument );
                positionNode.write_int( "note", nHighestPitch );
        } else {
                positionNode.write_int( "position", m_pPatternEditorPanel->getCursorPosition() );
                positionNode.write_int( "instrument", pHydrogen->getSelectedInstrumentNumber() );
        }
 
        QClipboard *clipboard = QApplication::clipboard();
        clipboard->setText( doc.toString() );
 
        // This selection will probably be pasted at some point. So show the keyboard cursor as this is the place
        // where the selection will be pasted.
        HydrogenApp::get_instance()->setHideKeyboardCursor( false );
}
 
 
void PatternEditor::cut()
{
        copy();
        deleteSelection();
}
 
 
void PatternEditor::selectInstrumentNotes( int nInstrument )
{
        if ( m_pPattern == nullptr ) {
                return;
        }
        
        auto pInstrumentList = Hydrogen::get_instance()->getSong()->getInstrumentList();
        auto pInstrument = pInstrumentList->get( nInstrument );
 
        m_selection.clearSelection();
        FOREACH_NOTE_CST_IT_BEGIN_LENGTH(m_pPattern->get_notes(), it, m_pPattern) {
                if ( it->second->get_instrument() == pInstrument ) {
                        m_selection.addToSelection( it->second );
                }
        }
        m_selection.updateWidgetGroup();
}
 
void PatternEditor::setCurrentInstrument( int nInstrument ) {
        Hydrogen::get_instance()->setSelectedInstrumentNumber( nInstrument );
        m_pPatternEditorPanel->updateEditors();
}
 
void PatternEditor::mousePressEvent( QMouseEvent *ev )
{
        updateModifiers( ev );
        m_selection.mousePressEvent( ev );
}
 
void PatternEditor::mouseMoveEvent( QMouseEvent *ev )
{
        updateModifiers( ev );
        if ( m_selection.isMoving() ) {
                updateEditor( true );
        }
        m_selection.mouseMoveEvent( ev );
}
 
void PatternEditor::mouseReleaseEvent( QMouseEvent *ev )
{
        updateModifiers( ev );
        m_selection.mouseReleaseEvent( ev );
}
 
void PatternEditor::updateModifiers( QInputEvent *ev ) {
        // Key: Alt + drag: move notes with fine-grained positioning
        m_bFineGrained = ev->modifiers() & Qt::AltModifier;
        // Key: Ctrl + drag: copy notes rather than moving
        m_bCopyNotMove = ev->modifiers() & Qt::ControlModifier;
 
        if ( QKeyEvent *pEv = dynamic_cast<QKeyEvent*>( ev ) ) {
                // Keyboard events for press and release of modifier keys don't have those keys in the modifiers set,
                // so explicitly update these.
                bool bPressed = ev->type() == QEvent::KeyPress;
                if ( pEv->key() == Qt::Key_Control ) {
                        m_bCopyNotMove = bPressed;
                } else if ( pEv->key() == Qt::Key_Alt ) {
                        m_bFineGrained = bPressed;
                }
        }
 
        if ( m_selection.isMouseGesture() && m_selection.isMoving() ) {
                // If a selection is currently being moved, change the cursor
                // appropriately. Selection will change it back after the move
                // is complete (or abandoned)
                if ( m_bCopyNotMove &&  cursor().shape() != Qt::DragCopyCursor ) {
                        setCursor( QCursor( Qt::DragCopyCursor ) );
                } else if ( !m_bCopyNotMove && cursor().shape() != Qt::DragMoveCursor ) {
                        setCursor( QCursor( Qt::DragMoveCursor ) );
                }
        }
}
 
bool PatternEditor::notesMatchExactly( Note *pNoteA, Note *pNoteB ) const {
        return ( pNoteA->match( pNoteB->get_instrument(), pNoteB->get_key(), pNoteB->get_octave() )
                         && pNoteA->get_position() == pNoteB->get_position()
                         && pNoteA->get_velocity() == pNoteB->get_velocity()
                         && pNoteA->getPan() == pNoteB->getPan()
                         && pNoteA->get_lead_lag() == pNoteB->get_lead_lag()
                         && pNoteA->get_probability() == pNoteB->get_probability() );
}
 
bool PatternEditor::checkDeselectElements( std::vector<SelectionIndex> &elements )
{
        if ( m_pPattern == nullptr ) {
                return false;
        }
 
        auto pCommonStrings = HydrogenApp::get_instance()->getCommonStrings();
        
        //      Hydrogen *pH = Hydrogen::get_instance();
        std::set< Note *> duplicates;
        for ( Note *pNote : elements ) {
                if ( duplicates.find( pNote ) != duplicates.end() ) {
                        // Already marked pNote as a duplicate of some other pNote. Skip it.
                        continue;
                }
                FOREACH_NOTE_CST_IT_BOUND_END( m_pPattern->get_notes(), it, pNote->get_position() ) {
                        // Duplicate note of a selected note is anything occupying the same position. Multiple notes
                        // sharing the same location might be selected; we count these as duplicates too. They will appear
                        // in both the duplicates and selection lists.
                        if ( it->second != pNote && pNote->match( it->second ) ) {
                                duplicates.insert( it->second );
                        }
                }
        }
        if ( !duplicates.empty() ) {
                Preferences *pPreferences = Preferences::get_instance();
                bool bOk = true;
 
                if ( pPreferences->getShowNoteOverwriteWarning() ) {
                        m_selection.cancelGesture();
                        QString sMsg ( tr( "Placing these notes here will overwrite %1 duplicate notes." ) );
                        QMessageBox messageBox ( QMessageBox::Warning, "Hydrogen", sMsg.arg( duplicates.size() ),
                                                                         QMessageBox::Cancel | QMessageBox::Ok, this );
                        messageBox.setCheckBox( new QCheckBox( pCommonStrings->getMutableDialog() ) );
                        messageBox.checkBox()->setChecked( false );
                        bOk = messageBox.exec() == QMessageBox::Ok;
                        if ( messageBox.checkBox()->isChecked() ) {
                                pPreferences->setShowNoteOverwriteWarning( false );
                        }
                }
 
                if ( bOk ) {
                        QUndoStack *pUndo = HydrogenApp::get_instance()->m_pUndoStack;
 
                        std::vector< Note *>overwritten;
                        for ( Note *pNote : duplicates ) {
                                overwritten.push_back( pNote );
                        }
                        pUndo->push( new SE_deselectAndOverwriteNotesAction( elements, overwritten ) );
 
                } else {
                        return false;
                }
        }
        return true;
}
 
 
void PatternEditor::deselectAndOverwriteNotes( std::vector< H2Core::Note *> &selected,
                                                                                           std::vector< H2Core::Note *> &overwritten )
{
        if ( m_pPattern == nullptr ) {
                return;
        }
        
        // Iterate over all the notes in 'selected' and 'overwrite' by erasing any *other* notes occupying the
        // same position.
        m_pAudioEngine->lock( RIGHT_HERE );
        Pattern::notes_t *pNotes = const_cast< Pattern::notes_t *>( m_pPattern->get_notes() );
        for ( auto pSelectedNote : selected ) {
                m_selection.removeFromSelection( pSelectedNote, /* bCheck=*/false );
                bool bFoundExact = false;
                int nPosition = pSelectedNote->get_position();
                for ( auto it = pNotes->lower_bound( nPosition ); it != pNotes->end() && it->first == nPosition; ) {
                        Note *pNote = it->second;
                        if ( !bFoundExact && notesMatchExactly( pNote, pSelectedNote ) ) {
                                // Found an exact match. We keep this.
                                bFoundExact = true;
                                ++it;
                        } else if ( pSelectedNote->match( pNote ) && pNote->get_position() == pSelectedNote->get_position() ) {
                                // Something else occupying the same position (which may or may not be an exact duplicate)
                                it = pNotes->erase( it );
                                delete pNote;
                        } else {
                                // Any other note
                                ++it;
                        }
                }
        }
        Hydrogen::get_instance()->setIsModified( true );
        m_pAudioEngine->unlock();
}
 
 
void PatternEditor::undoDeselectAndOverwriteNotes( std::vector< H2Core::Note *> &selected,
                                                                                                   std::vector< H2Core::Note *> &overwritten )
{
        if ( m_pPattern == nullptr ) {
                return;
        }
        
        // Restore previously-overwritten notes, and select notes that were selected before.
        m_selection.clearSelection( /* bCheck=*/false );
        m_pAudioEngine->lock( RIGHT_HERE );
        for ( auto pNote : overwritten ) {
                Note *pNewNote = new Note( pNote );
                m_pPattern->insert_note( pNewNote );
        }
        // Select the previously-selected notes
        for ( auto pNote : selected ) {
                FOREACH_NOTE_CST_IT_BOUND_END( m_pPattern->get_notes(), it, pNote->get_position() ) {
                        if ( notesMatchExactly( it->second, pNote ) ) {
                                m_selection.addToSelection( it->second );
                                break;
                        }
                }
        }
        Hydrogen::get_instance()->setIsModified( true );
        m_pAudioEngine->unlock();
        m_pPatternEditorPanel->updateEditors();
}
 
 
void PatternEditor::updatePatternInfo() {
        Hydrogen *pHydrogen = Hydrogen::get_instance();
        std::shared_ptr<Song> pSong = pHydrogen->getSong();
 
        m_pPattern = nullptr;
        m_nSelectedPatternNumber = pHydrogen->getSelectedPatternNumber();
 
        if ( pSong != nullptr ) {
                PatternList *pPatternList = pSong->getPatternList();
                if ( ( m_nSelectedPatternNumber != -1 ) && ( m_nSelectedPatternNumber < pPatternList->size() ) ) {
                        m_pPattern = pPatternList->get( m_nSelectedPatternNumber );
                }
        }
}
 
 
QPoint PatternEditor::movingGridOffset( ) const {
        QPoint rawOffset = m_selection.movingOffset();
        // Quantize offset to multiples of m_nGrid{Width,Height}
        int nQuantX = m_fGridWidth, nQuantY = m_nGridHeight;
        float nFactor = 1;
        if ( ! m_bFineGrained ) {
                nFactor = granularity();
                nQuantX = m_fGridWidth * nFactor;
        }
        int x_bias = nQuantX / 2, y_bias = nQuantY / 2;
        if ( rawOffset.y() < 0 ) {
                y_bias = -y_bias;
        }
        if ( rawOffset.x() < 0 ) {
                x_bias = -x_bias;
        }
        int x_off = (rawOffset.x() + x_bias) / nQuantX;
        int y_off = (rawOffset.y() + y_bias) / nQuantY;
        return QPoint( nFactor * x_off, y_off);
}
 
 
void PatternEditor::drawGridLines( QPainter &p, Qt::PenStyle style ) const
{
        auto pPref = H2Core::Preferences::get_instance();
        const std::vector<QColor> colorsActive = {
                QColor( pPref->getColorTheme()->m_patternEditor_line1Color ),
                QColor( pPref->getColorTheme()->m_patternEditor_line2Color ),
                QColor( pPref->getColorTheme()->m_patternEditor_line3Color ),
                QColor( pPref->getColorTheme()->m_patternEditor_line4Color ),
                QColor( pPref->getColorTheme()->m_patternEditor_line5Color ),
        };
        const std::vector<QColor> colorsInactive = {
                QColor( pPref->getColorTheme()->m_windowTextColor.darker( 170 ) ),
                QColor( pPref->getColorTheme()->m_windowTextColor.darker( 190 ) ),
                QColor( pPref->getColorTheme()->m_windowTextColor.darker( 210 ) ),
                QColor( pPref->getColorTheme()->m_windowTextColor.darker( 230 ) ),
                QColor( pPref->getColorTheme()->m_windowTextColor.darker( 250 ) ),
        };
 
        int nGranularity = granularity() * m_nResolution;
 
        if ( !m_bUseTriplets ) {
 
                // Draw vertical lines. To minimise pen colour changes (and
                // avoid unnecessary division operations), we draw them in
                // multiple passes, of successively finer spacing (and
                // advancing the colour selection at each refinement) until
                // we've drawn enough to satisfy the resolution setting.
                //
                // The drawing sequence looks something like:
                // |       |       |       |         - first pass, all 1/4 notes
                // |   :   |   :   |   :   |   :     - second pass, odd 1/8th notes
                // | . : . | . : . | . : . | . : .   - third pass, odd 1/16th notes
 
                uint nRes = 4;
                float fStep = nGranularity / nRes * m_fGridWidth;
 
                // First, quarter note markers. All the quarter note markers must be drawn.
                if ( m_nResolution >= nRes ) {
                        float x = PatternEditor::nMargin;
                        p.setPen( QPen( colorsActive[ 0 ], 1, style ) );
                        while ( x < m_nActiveWidth ) {
                                p.drawLine( x, 1, x, m_nEditorHeight - 1 );
                                x += fStep;
                        }
                        
                        p.setPen( QPen( colorsInactive[ 0 ], 1, style ) );
                        while ( x < m_nEditorWidth ) {
                                p.drawLine( x, 1, x, m_nEditorHeight - 1 );
                                x += fStep;
                        }
                }
                nRes *= 2;
                fStep /= 2;
 
                // For each successive set of finer-spaced lines, the even
                // lines will have already been drawn at the previous coarser
                // pitch, so only the odd numbered lines need to be drawn.
                int nColour = 1;
                while ( m_nResolution >= nRes ) {
                        nColour++;
                        float x = PatternEditor::nMargin + fStep;
                        p.setPen( QPen( colorsActive[ std::min( nColour, static_cast<int>(colorsActive.size()) - 1 ) ],
                                                        1, style ) );
                        while ( x < m_nActiveWidth + fStep ) {
                                p.drawLine( x, 1, x, m_nEditorHeight - 1 );
                                x += fStep * 2;
                        }
 
                        p.setPen( QPen( colorsInactive[ std::min( nColour, static_cast<int>(colorsInactive.size()) - 1 ) ],
                                                        1, style ) );
                        while ( x < m_nEditorWidth ) {
                                p.drawLine( x, 1, x, m_nEditorHeight - 1 );
                                x += fStep * 2;
                        }
                        nRes *= 2;
                        fStep /= 2;
                }
 
        } else {
 
                // Triplet style markers, we only differentiate colours on the
                // first of every triplet.
                float fStep = granularity() * m_fGridWidth;
                float x = PatternEditor::nMargin;
                p.setPen(  QPen( colorsActive[ 0 ], 1, style ) );
                while ( x < m_nActiveWidth ) {
                        p.drawLine(x, 1, x, m_nEditorHeight - 1);
                        x += fStep * 3;
                }
                
                p.setPen(  QPen( colorsInactive[ 0 ], 1, style ) );
                while ( x < m_nEditorWidth ) {
                        p.drawLine(x, 1, x, m_nEditorHeight - 1);
                        x += fStep * 3;
                }
                
                // Second and third marks
                x = PatternEditor::nMargin + fStep;
                p.setPen(  QPen( colorsActive[ 2 ], 1, style ) );
                while ( x < m_nActiveWidth + fStep ) {
                        p.drawLine(x, 1, x, m_nEditorHeight - 1);
                        p.drawLine(x + fStep, 1, x + fStep, m_nEditorHeight - 1);
                        x += fStep * 3;
                }
                
                p.setPen( QPen( colorsInactive[ 2 ], 1, style ) );
                while ( x < m_nEditorWidth ) {
                        p.drawLine(x, 1, x, m_nEditorHeight - 1);
                        p.drawLine(x + fStep, 1, x + fStep, m_nEditorHeight - 1);
                        x += fStep * 3;
                }
        }
 
}
 
 
QColor PatternEditor::selectedNoteColor() const {
        
        auto pPref = H2Core::Preferences::get_instance();
        
        if ( hasFocus() ) {
                const QColor selectHighlightColor( pPref->getColorTheme()->m_selectionHighlightColor );
                return selectHighlightColor;
        } else {
                const QColor selectInactiveColor( pPref->getColorTheme()->m_selectionInactiveColor );
                return selectInactiveColor;
        }
}
 
 
void PatternEditor::validateSelection()
{
        if ( m_pPattern == nullptr ) {
                return;
        }
        
        // Rebuild selection from valid notes.
        std::set<Note *> valid;
        std::vector< Note *> invalidated;
        FOREACH_NOTE_CST_IT_BEGIN_END(m_pPattern->get_notes(), it) {
                if ( m_selection.isSelected( it->second ) ) {
                        valid.insert( it->second );
                }
        }
        for (auto i : m_selection ) {
                if ( valid.find(i) == valid.end()) {
                        // Keep the note to invalidate, but don't remove from the selection while walking the selection
                        // set.
                        invalidated.push_back( i );
                }
        }
        for ( auto i : invalidated ) {
                m_selection.removeFromSelection( i, /* bCheck=*/false );
        }
}
 
void PatternEditor::scrolled( int nValue ) {
        UNUSED( nValue );
        update();
}
 
void PatternEditor::enterEvent( QEvent *ev ) {
        UNUSED( ev );
        m_bEntered = true;
        update();
}
 
void PatternEditor::leaveEvent( QEvent *ev ) {
        UNUSED( ev );
        m_bEntered = false;
        update();
}
 
void PatternEditor::focusInEvent( QFocusEvent *ev ) {
        UNUSED( ev );
        if ( ev->reason() == Qt::TabFocusReason || ev->reason() == Qt::BacktabFocusReason ) {
                HydrogenApp::get_instance()->setHideKeyboardCursor( false );
                m_pPatternEditorPanel->ensureCursorVisible();
        }
        if ( ! HydrogenApp::get_instance()->hideKeyboardCursor() ) {
                // Immediate update to prevent visual delay.
                m_pPatternEditorPanel->getPatternEditorRuler()->update();
                m_pPatternEditorPanel->getInstrumentList()->update();
        }
 
        // Update to show the focus border highlight
        update();
}
 
void PatternEditor::focusOutEvent( QFocusEvent *ev ) {
        UNUSED( ev );
        if ( ! HydrogenApp::get_instance()->hideKeyboardCursor() ) {
                m_pPatternEditorPanel->getPatternEditorRuler()->update();
                m_pPatternEditorPanel->getInstrumentList()->update();
        }
        
        // Update to remove the focus border highlight
        update();
}
 
void PatternEditor::invalidateBackground() {
        m_bBackgroundInvalid = true;
}
 
void PatternEditor::createBackground() {
}
 
std::vector< Pattern *> PatternEditor::getPatternsToShow( void )
{
        Hydrogen *pHydrogen = Hydrogen::get_instance();
        std::vector<Pattern *> patterns;
 
        // When using song mode without the pattern editor being locked
        // only the current pattern will be shown. In every other base
        // remaining playing patterns not selected by the user are added
        // as well.
        if ( ! ( pHydrogen->getMode() == Song::Mode::Song &&
                         ! pHydrogen->isPatternEditorLocked() ) ) {
                m_pAudioEngine->lock( RIGHT_HERE );
                if ( m_pAudioEngine->getPlayingPatterns()->size() > 0 ) {
                        std::set< Pattern *> patternSet;
 
                        std::vector<const PatternList*> patternLists;
                        patternLists.push_back( m_pAudioEngine->getPlayingPatterns() );
                        if ( pHydrogen->getPatternMode() == Song::PatternMode::Stacked ) {
                                patternLists.push_back( m_pAudioEngine->getNextPatterns() );
                        }
                
                        for ( const PatternList *pPatternList : patternLists ) {
                                for ( int i = 0; i <  pPatternList->size(); i++) {
                                        Pattern *pPattern = pPatternList->get( i );
                                        if ( pPattern != m_pPattern ) {
                                                patternSet.insert( pPattern );
                                        }
                                }
                        }
                        for ( Pattern *pPattern : patternSet ) {
                                patterns.push_back( pPattern );
                        }
                }
                m_pAudioEngine->unlock();
        }
        else if ( m_pPattern != nullptr &&
                          pHydrogen->getMode() == Song::Mode::Song &&
                          m_pPattern->get_virtual_patterns()->size() > 0 ) {
                // A virtual pattern was selected in song mode without the
                // pattern editor being locked. Virtual patterns in selected
                // pattern mode are handled using the playing pattern above.
                for ( const auto ppVirtualPattern : *m_pPattern ) {
                        patterns.push_back( ppVirtualPattern );
                }
        }
                          
 
        if ( m_pPattern != nullptr ) {
                patterns.push_back( m_pPattern );
        }
 
        return patterns;
}
 
bool PatternEditor::isUsingAdditionalPatterns( const H2Core::Pattern* pPattern ) {
        auto pHydrogen = H2Core::Hydrogen::get_instance();
        
        if ( pHydrogen->getPatternMode() == Song::PatternMode::Stacked ||
                 ( pPattern != nullptr && pPattern->isVirtual() ) ||
                 ( pHydrogen->getMode() == Song::Mode::Song &&
                   pHydrogen->isPatternEditorLocked() ) ) {
                return true;
        }
        
        return false;
}
 
void PatternEditor::updateWidth() {
        auto pHydrogen = H2Core::Hydrogen::get_instance();
        
        if ( m_pPattern != nullptr ) {
                m_nActiveWidth = PatternEditor::nMargin + m_fGridWidth *
                        m_pPattern->get_length();
                
                // In case there are other patterns playing which are longer
                // than the selected one, their notes will be placed using a
                // different color set between m_nActiveWidth and
                // m_nEditorWidth.
                if ( pHydrogen->getMode() == Song::Mode::Song &&
                         m_pPattern != nullptr && m_pPattern->isVirtual() &&
                         ! pHydrogen->isPatternEditorLocked() ) {
                        m_nEditorWidth = 
                                std::max( PatternEditor::nMargin + m_fGridWidth *
                                                  m_pPattern->longestVirtualPatternLength() + 1,
                                                  static_cast<float>(m_nActiveWidth) );
                }
                else if ( isUsingAdditionalPatterns( m_pPattern ) ) {
                        m_nEditorWidth =
                                std::max( PatternEditor::nMargin + m_fGridWidth *
                                                  pHydrogen->getAudioEngine()->getPlayingPatterns()->longest_pattern_length( false ) + 1,
                                                  static_cast<float>(m_nActiveWidth) );
                }
                else {
                        m_nEditorWidth = m_nActiveWidth;
                }
        }
        else {
                m_nEditorWidth = PatternEditor::nMargin + MAX_NOTES * m_fGridWidth;
                m_nActiveWidth = m_nEditorWidth;
        }
}
 
void PatternEditor::songModeActivationEvent()
{
        // May need to draw (or hide) other background patterns
        update();
}
 
void PatternEditor::stackedModeActivationEvent( int nValue )
{
        UNUSED( nValue );
        // May need to draw (or hide) other background patterns
        update();
}
 
void PatternEditor::updatePosition( float fTick ) {
        if ( m_nTick == (int)fTick ) {
                return;
        }
 
        float fDiff = m_fGridWidth * (fTick - m_nTick);
 
        m_nTick = fTick;
 
        int nOffset = Skin::getPlayheadShaftOffset();
        int nX = static_cast<int>(static_cast<float>(PatternEditor::nMargin) +
                                                          static_cast<float>(m_nTick) *
                                                          m_fGridWidth );
 
        QRect updateRect( nX -2, 0, 4 + Skin::nPlayheadWidth, height() );
        update( updateRect );
        if ( fDiff > 1.0 || fDiff < -1.0 ) {
                // New cursor is far enough away from the old one that the single update rect won't cover both. So
                // update at the old location as well.
                updateRect.translate( -fDiff, 0 );
                update( updateRect );
        }
}
 
void PatternEditor::storeNoteProperties( const Note* pNote ) {
        if( pNote != nullptr ){
                m_nOldLength = pNote->get_length();
                //needed to undo note properties
                m_fOldVelocity = pNote->get_velocity();
                m_fOldPan = pNote->getPan();
 
                m_fOldLeadLag = pNote->get_lead_lag();
 
                m_fVelocity = m_fOldVelocity;
                m_fPan = m_fOldPan;
                m_fLeadLag = m_fOldLeadLag;
        }
        else {
                m_nOldLength = -1;
        }
}
 
void PatternEditor::mouseDragStartEvent( QMouseEvent *ev ) {
 
        auto pHydrogenApp = HydrogenApp::get_instance();
        auto pHydrogen = Hydrogen::get_instance();
 
        // Move cursor.
        int nColumn = getColumn( ev->x() );
        m_pPatternEditorPanel->setCursorPosition( nColumn );
 
        // Hide cursor.
        bool bOldCursorHidden = pHydrogenApp->hideKeyboardCursor();
        
        pHydrogenApp->setHideKeyboardCursor( true );
        
        // Cursor either just got hidden or was moved.
        if ( bOldCursorHidden != pHydrogenApp->hideKeyboardCursor() ) {
                // Immediate update to prevent visual delay.
                m_pPatternEditorPanel->getInstrumentList()->repaintInstrumentLines();
                m_pPatternEditorPanel->getPatternEditorRuler()->update();
        }
 
        int nRealColumn = 0;
 
        if ( ev->button() == Qt::RightButton ) {
 
                int nPressedLine =
                        std::floor(static_cast<float>(ev->y()) / static_cast<float>(m_nGridHeight));
                int nSelectedInstrumentNumber = pHydrogen->getSelectedInstrumentNumber();
                
                if( ev->x() > PatternEditor::nMargin ) {
                        nRealColumn =
                                static_cast<int>(std::floor(
                                        static_cast<float>((ev->x() - PatternEditor::nMargin)) /
                                        m_fGridWidth));
                }
 
                // Needed for undo changes in the note length
                m_nOldPoint = ev->y();
                m_nRealColumn = nRealColumn;
                m_nColumn = nColumn;
                m_nPressedLine = nPressedLine;
                m_nSelectedInstrumentNumber = pHydrogen->getSelectedInstrumentNumber();
        }
 
}
 
void PatternEditor::mouseDragUpdateEvent( QMouseEvent *ev) {
 
        if ( m_pPattern == nullptr || m_pDraggedNote == nullptr ) {
                return;
        }
 
        if ( m_pDraggedNote->get_note_off() ) {
                return;
        }
 
        int nTickColumn = getColumn( ev->x() );
 
        m_pAudioEngine->lock( RIGHT_HERE );
        int nLen = nTickColumn - m_pDraggedNote->get_position();
 
        if ( nLen <= 0 ) {
                nLen = -1;
        }
 
        float fNotePitch = m_pDraggedNote->get_notekey_pitch();
        float fStep = 0;
        if ( nLen > -1 ){
                fStep = Note::pitchToFrequency( ( double )fNotePitch );
        } else {
                fStep = 1.0;
        }
        m_pDraggedNote->set_length( nLen * fStep);
 
        m_mode = m_pPatternEditorPanel->getNotePropertiesMode();
 
        // edit note property. We do not support the note key property.
        if ( m_mode != Mode::NoteKey ) {
 
                float fValue = 0.0;
                if ( m_mode == Mode::Velocity ) {
                        fValue = m_pDraggedNote->get_velocity();
                }
                else if ( m_mode == Mode::Pan ) {
                        fValue = m_pDraggedNote->getPanWithRangeFrom0To1();
                }
                else if ( m_mode == Mode::LeadLag ) {
                        fValue = ( m_pDraggedNote->get_lead_lag() - 1.0 ) / -2.0 ;
                }
                else if ( m_mode == Mode::Probability ) {
                        fValue = m_pDraggedNote->get_probability();
                }
                
                float fMoveY = m_nOldPoint - ev->y();
                fValue = fValue  + (fMoveY / 100);
                if ( fValue > 1 ) {
                        fValue = 1;
                }
                else if ( fValue < 0.0 ) {
                        fValue = 0.0;
                }
 
                if ( m_mode == Mode::Velocity ) {
                        m_pDraggedNote->set_velocity( fValue );
                        m_fVelocity = fValue;
                }
                else if ( m_mode == Mode::Pan ) {
                        m_pDraggedNote->setPanWithRangeFrom0To1( fValue );
                        m_fPan = m_pDraggedNote->getPan();
                }
                else if ( m_mode == Mode::LeadLag ) {
                        m_pDraggedNote->set_lead_lag( ( fValue * -2.0 ) + 1.0 );
                        m_fLeadLag = ( fValue * -2.0 ) + 1.0;
                }
                else if ( m_mode == Mode::Probability ) {
                        m_pDraggedNote->set_probability( fValue );
                        m_fProbability = fValue;
                }
 
                PatternEditor::triggerStatusMessage( m_pDraggedNote, m_mode );
                
                m_nOldPoint = ev->y();
        }
 
        m_pAudioEngine->unlock(); // unlock the audio engine
        Hydrogen::get_instance()->setIsModified( true );
 
        if ( m_pPatternEditorPanel != nullptr ) {
                m_pPatternEditorPanel->updateEditors( true );
        }
}
 
void PatternEditor::mouseDragEndEvent( QMouseEvent* ev ) {
 
        UNUSED( ev );
        unsetCursor();
        
        if ( m_pPattern == nullptr || m_nSelectedPatternNumber == -1 ) {
                return;
        }
 
        if ( m_pDraggedNote == nullptr || m_pDraggedNote->get_note_off() ) {
                return;
        }
 
        if ( m_pDraggedNote->get_length() != m_nOldLength ) {
                SE_editNoteLengthAction *action =
                        new SE_editNoteLengthAction( m_pDraggedNote->get_position(),
                                                                                 m_pDraggedNote->get_position(),
                                                                                 m_nRow,
                                                                                 m_pDraggedNote->get_length(),
                                                                                 m_nOldLength,
                                                                                 m_nSelectedPatternNumber,
                                                                                 m_nSelectedInstrumentNumber,
                                                                                 m_editor );
                HydrogenApp::get_instance()->m_pUndoStack->push( action );
        }
 
 
        if( m_fVelocity == m_fOldVelocity &&
                m_fOldPan == m_fPan &&
                m_fOldLeadLag == m_fLeadLag &&
                m_fOldProbability == m_fProbability ) {
                return;
        }
                
        SE_editNotePropertiesAction *action =
                new SE_editNotePropertiesAction( m_pDraggedNote->get_position(),
                                                                                 m_pDraggedNote->get_position(),
                                                                                 m_nRow,
                                                                                 m_nSelectedPatternNumber,
                                                                                 m_nSelectedInstrumentNumber,
                                                                                 m_mode,
                                                                                 m_editor,
                                                                                 m_fVelocity,
                                                                                 m_fOldVelocity,
                                                                                 m_fPan,
                                                                                 m_fOldPan,
                                                                                 m_fLeadLag,
                                                                                 m_fOldLeadLag,
                                                                                 m_fProbability,
                                                                                 m_fOldProbability );
        HydrogenApp::get_instance()->m_pUndoStack->push( action );
}
 
void PatternEditor::editNoteLengthAction( int nColumn,
                                                                                  int nRealColumn,
                                                                                  int nRow,
                                                                                  int nLength,
                                                                                  int nSelectedPatternNumber,
                                                                                  int nSelectedInstrumentnumber,
                                                                                  Editor editor)
{
 
        auto pHydrogen = Hydrogen::get_instance();
        auto pSong = pHydrogen->getSong();
        auto pPatternList = pSong->getPatternList();
 
        H2Core::Pattern* pPattern = nullptr;
        if ( nSelectedPatternNumber != -1 &&
                 nSelectedPatternNumber < pPatternList->size() ) {
                pPattern = pPatternList->get( nSelectedPatternNumber );
        }
 
        if ( pPattern == nullptr ) {
                return;
        }
 
        m_pAudioEngine->lock( RIGHT_HERE );
 
        // Find the note to edit
        Note* pDraggedNote = nullptr;
        if ( editor == Editor::PianoRoll ) {
                auto pSelectedInstrument =
                        pSong->getInstrumentList()->get( nSelectedInstrumentnumber );
                if ( pSelectedInstrument == nullptr ) {
                        ERRORLOG( "No instrument selected" );
                        return;
                }
                
                Note::Octave pressedOctave = Note::pitchToOctave( lineToPitch( nRow ) );
                Note::Key pressedNoteKey = Note::pitchToKey( lineToPitch( nRow ) );
 
                auto pDraggedNote = pPattern->find_note( nColumn, nRealColumn,
                                                                                                 pSelectedInstrument,
                                                                                                 pressedNoteKey, pressedOctave,
                                                                                                 false );
        }
        else if ( editor == Editor::DrumPattern ) {
                auto pSelectedInstrument = pSong->getInstrumentList()->get( nRow );
                if ( pSelectedInstrument == nullptr ) {
                        ERRORLOG( "No instrument selected" );
                        return;
                }
                pDraggedNote = pPattern->find_note( nColumn, nRealColumn, pSelectedInstrument, false );
        }
        else {
                ERRORLOG( QString( "Unsupported editor [%1]" )
                                  .arg( static_cast<int>(editor) ) );
                m_pAudioEngine->unlock();
                return;
        }       
                
        if ( pDraggedNote != nullptr ){
                pDraggedNote->set_length( nLength );
        }
 
        m_pAudioEngine->unlock();
        
        pHydrogen->setIsModified( true );
 
        if ( m_pPatternEditorPanel != nullptr ) {
                m_pPatternEditorPanel->updateEditors( true );
        }
}
 
 
void PatternEditor::editNotePropertiesAction( int nColumn,
                                                                                          int nRealColumn,
                                                                                          int nRow,
                                                                                          int nSelectedPatternNumber,
                                                                                          int nSelectedInstrumentNumber,
                                                                                          Mode mode,
                                                                                          Editor editor,
                                                                                          float fVelocity,
                                                                                          float fPan,
                                                                                          float fLeadLag,
                                                                                          float fProbability )
{
 
        auto pHydrogen = Hydrogen::get_instance();
        auto pSong = pHydrogen->getSong();
        auto pPatternList = pSong->getPatternList();
 
        H2Core::Pattern* pPattern = nullptr;
        if ( nSelectedPatternNumber != -1 &&
                 nSelectedPatternNumber < pPatternList->size() ) {
                pPattern = pPatternList->get( nSelectedPatternNumber );
        }
 
        if ( pPattern == nullptr ) {
                return;
        }
 
        m_pAudioEngine->lock( RIGHT_HERE );
 
        // Find the note to edit
        Note* pDraggedNote = nullptr;
        if ( editor == Editor::PianoRoll ) {
                
                auto pSelectedInstrument =
                        pSong->getInstrumentList()->get( nSelectedInstrumentNumber );
                if ( pSelectedInstrument == nullptr ) {
                        ERRORLOG( "No instrument selected" );
                        return;
                }
                
                Note::Octave pressedOctave = Note::pitchToOctave( lineToPitch( nRow ) );
                Note::Key pressedNoteKey = Note::pitchToKey( lineToPitch( nRow ) );
 
                pDraggedNote = pPattern->find_note( nColumn, nRealColumn,
                                                                                                 pSelectedInstrument,
                                                                                                 pressedNoteKey, pressedOctave,
                                                                                                 false );
        }
        else if ( editor == Editor::DrumPattern ) {
                auto pSelectedInstrument = pSong->getInstrumentList()->get( nRow );
                if ( pSelectedInstrument == nullptr ) {
                        ERRORLOG( "No instrument selected" );
                        return;
                }
                pDraggedNote = pPattern->find_note( nColumn, nRealColumn, pSelectedInstrument, false );
        }
        else {
                ERRORLOG( QString( "Unsupported editor [%1]" )
                                  .arg( static_cast<int>(editor) ) );
                m_pAudioEngine->unlock();
                return;
        }
 
        bool bValueChanged = true;
 
        if ( pDraggedNote != nullptr ){
                switch ( mode ) {
                case Mode::Velocity:
                        pDraggedNote->set_velocity( fVelocity );
                        break;
                case Mode::Pan:
                        pDraggedNote->setPan( fPan );
                        break;
                case Mode::LeadLag:
                        pDraggedNote->set_lead_lag( fLeadLag );
                        break;
                case Mode::Probability:
                        pDraggedNote->set_probability( fProbability );
                        break;
                }                       
                bValueChanged = true;
                PatternEditor::triggerStatusMessage( pDraggedNote, mode );
        } else {
                ERRORLOG("note could not be found");
        }
 
        m_pAudioEngine->unlock();
 
        if ( bValueChanged &&
                 m_pPatternEditorPanel != nullptr ) {
                pHydrogen->setIsModified( true );
                m_pPatternEditorPanel->updateEditors( true );
        }
}
 
                                        
QString PatternEditor::modeToQString( Mode mode ) {
        QString s;
        
        switch ( mode ) {
        case PatternEditor::Mode::Velocity:
                s = "Velocity";
                break;
        case PatternEditor::Mode::Pan:
                s = "Pan";
                break;
        case PatternEditor::Mode::LeadLag:
                s = "LeadLag";
                break;
        case PatternEditor::Mode::NoteKey:
                s = "NoteKey";
                break;
        case PatternEditor::Mode::Probability:
                s = "Probability";
                break;
        default:
                s = QString( "Unknown mode [%1]" ).arg( static_cast<int>(mode) ) ;
                break;
        }
 
        return s;
}
 
void PatternEditor::triggerStatusMessage( Note* pNote, Mode mode ) {
        QString s;
        QString sCaller( _class_name() );
        QString sUnit( tr( "ticks" ) );
        float fValue;
        
        switch ( mode ) {
        case PatternEditor::Mode::Velocity:
                if ( ! pNote->get_note_off() ) {
                        s = QString( tr( "Set note velocity" ) )
                                .append( QString( ": [%1]")
                                                 .arg( pNote->get_velocity(), 2, 'f', 2 ) );
                        sCaller.append( ":Velocity" );
                }
                break;
                
        case PatternEditor::Mode::Pan:
                if ( ! pNote->get_note_off() ) {
 
                        // Round the pan to not miss the center due to fluctuations
                        fValue = pNote->getPan() * 100;
                        fValue = std::round( fValue );
                        fValue = fValue / 100;
                        
                        if ( fValue > 0.0 ) {
                                s = QString( tr( "Note panned to the right by" ) ).
                                        append( QString( ": [%1]" ).arg( fValue / 2, 2, 'f', 2 ) );
                        } else if ( fValue < 0.0 ) {
                                s = QString( tr( "Note panned to the left by" ) ).
                                        append( QString( ": [%1]" ).arg( -1 * fValue / 2, 2, 'f', 2 ) );
                        } else {
                                s = QString( tr( "Note centered" ) );
                        }
                        sCaller.append( ":Pan" );
                }
                break;
                
        case PatternEditor::Mode::LeadLag:
                // Round the pan to not miss the center due to fluctuations
                fValue = pNote->get_lead_lag() * 100;
                fValue = std::round( fValue );
                fValue = fValue / 100;
                if ( fValue < 0.0 ) {
                        s = QString( tr( "Leading beat by" ) )
                                .append( QString( ": [%1] " )
                                                 .arg( fValue * -1 *
                                                           AudioEngine::getLeadLagInTicks() , 2, 'f', 2 ) )
                                .append( sUnit );
                }
                else if ( fValue > 0.0 ) {
                        s = QString( tr( "Lagging beat by" ) )
                                .append( QString( ": [%1] " )
                                                 .arg( fValue *
                                                           AudioEngine::getLeadLagInTicks() , 2, 'f', 2 ) )
                                .append( sUnit );
                }
                else {
                        s = tr( "Note on beat" );
                }
                sCaller.append( ":LeadLag" );
                break;
 
        case PatternEditor::Mode::NoteKey:
                s = QString( tr( "Set pitch" ) ).append( ": " ).append( tr( "key" ) )
                        .append( QString( " [%1], " ).arg( Note::KeyToQString( pNote->get_key() ) ) )
                        .append( tr( "octave" ) )
                        .append( QString( ": [%1]" ).arg( pNote->get_octave() ) );
                sCaller.append( ":NoteKey" );
                break;
 
        case PatternEditor::Mode::Probability:
                if ( ! pNote->get_note_off() ) {
                        s = tr( "Set note probability to" )
                                .append( QString( ": [%1]" ).arg( pNote->get_probability(), 2, 'f', 2 ) );
                }
                sCaller.append( ":Probability" );
                break;
 
        default:
                ERRORLOG( PatternEditor::modeToQString( mode ) );
        }
 
        if ( ! s.isEmpty() ) {
                HydrogenApp::get_instance()->showStatusBarMessage( s, sCaller );
        }
}