NotePropertiesRuler.cpp

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/*
 * Hydrogen
 * Copyright(c) 2002-2008 by Alex >Comix< Cominu [comix@users.sourceforge.net]
 * 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 <core/Hydrogen.h>
#include <core/Basics/Instrument.h>
#include <core/Basics/InstrumentList.h>
#include <core/Basics/Pattern.h>
#include <core/Basics/PatternList.h>
using namespace H2Core;
 
#include <cassert>
 
#include "../HydrogenApp.h"
 
#include "UndoActions.h"
#include "NotePropertiesRuler.h"
#include "PatternEditorPanel.h"
#include "PatternEditorRuler.h"
#include "DrumPatternEditor.h"
#include "PianoRollEditor.h"
#include "../Skin.h"
 
NotePropertiesRuler::NotePropertiesRuler( QWidget *parent, PatternEditorPanel *pPatternEditorPanel, PatternEditor::Mode mode )
        : PatternEditor( parent, pPatternEditorPanel )
        , m_bEntered( false )
{
 
        m_editor = PatternEditor::Editor::NotePropertiesRuler;
        m_mode = mode;
 
        m_fGridWidth = (Preferences::get_instance())->getPatternEditorGridWidth();
        m_nEditorWidth = PatternEditor::nMargin + m_fGridWidth * ( MAX_NOTES * 4 );
 
        m_fLastSetValue = 0.0;
        m_bValueHasBeenSet = false;
 
        if ( m_mode == PatternEditor::Mode::NoteKey ) {
                m_nEditorHeight = 210;
        }
        else {
                m_nEditorHeight = 100;
        }
 
        resize( m_nEditorWidth, m_nEditorHeight );
        setMinimumHeight( m_nEditorHeight );
 
        updateEditor();
        show();
 
        HydrogenApp::get_instance()->addEventListener( this );
        connect( HydrogenApp::get_instance(), &HydrogenApp::preferencesChanged, this, &NotePropertiesRuler::onPreferencesChanged );
 
        setFocusPolicy( Qt::StrongFocus );
 
        // Generic pattern editor menu contains some operations that don't apply here, and we will want to add
        // menu options specific to this later.
        delete m_pPopupMenu;
        m_pPopupMenu = new QMenu( this );
        m_pPopupMenu->addAction( tr( "Select &all" ), this, SLOT( selectAll() ) );
        m_pPopupMenu->addAction( tr( "Clear selection" ), this, SLOT( selectNone() ) );
 
        setMouseTracking( true );
}
 
 
 
 
NotePropertiesRuler::~NotePropertiesRuler()
{
}
 

void NotePropertiesRuler::wheelEvent(QWheelEvent *ev )
{
        Hydrogen *pHydrogen = Hydrogen::get_instance();
        if ( m_pPattern == nullptr ) {
                return;
        }
 
#if QT_VERSION >= QT_VERSION_CHECK( 5, 14, 0 )
        prepareUndoAction( ev->position().x() ); //get all old values
#else
        prepareUndoAction( ev->x() ); //get all old values
#endif
 
        float fDelta;
        if ( ev->modifiers() == Qt::ControlModifier || ev->modifiers() == Qt::AltModifier ) {
                fDelta = 0.01; // fine control
        } else {
                fDelta = 0.05; // coarse control
        }
        if ( ev->angleDelta().y() < 0 ) {
                fDelta = fDelta * -1.0;
        }
 
#if QT_VERSION >= QT_VERSION_CHECK( 5, 14, 0 )
        int nColumn = getColumn( ev->position().x() );
#else
        int nColumn = getColumn( ev->x() );
#endif
 
        m_pPatternEditorPanel->setCursorPosition( nColumn );
 
        auto pHydrogenApp = HydrogenApp::get_instance();
        bool bOldCursorHidden = pHydrogenApp->hideKeyboardCursor();
        pHydrogenApp->setHideKeyboardCursor( true );
 
        auto pSelectedInstrument = pHydrogen->getSelectedInstrument();
        if ( pSelectedInstrument == nullptr ) {
                ERRORLOG( "No instrument selected" );
                return;
        }
 
        // Gather notes to act on: selected or under the mouse cursor
        std::list< Note *> notes;
        if ( m_selection.begin() != m_selection.end() ) {
                for ( Note *pNote : m_selection ) {
                        notes.push_back( pNote );
                }
        } else {
                FOREACH_NOTE_CST_IT_BOUND_LENGTH( m_pPattern->get_notes(), it, nColumn, m_pPattern ) {
                        notes.push_back( it->second );
                }
        }
        
        bool bValueChanged = false;
        for ( Note *pNote : notes ) {
                assert( pNote );
                if ( pNote->get_instrument() != pSelectedInstrument && !m_selection.isSelected( pNote ) ) {
                        continue;
                }
                bValueChanged = true;
                adjustNotePropertyDelta( pNote, fDelta, /* bMessage=*/ true );
        }
        
        if ( bOldCursorHidden != pHydrogenApp->hideKeyboardCursor() ) {
                // Immediate update to prevent visual delay.
                m_pPatternEditorPanel->getPatternEditorRuler()->update();
                if ( ! bValueChanged ) {
                        update();
                }
        }
 
        if ( bValueChanged ) {
                addUndoAction();
                invalidateBackground();
                update();
        }
}
 
 
void NotePropertiesRuler::mouseClickEvent( QMouseEvent *ev ) {
        if ( ev->button() == Qt::RightButton ) {
                m_pPopupMenu->popup( ev->globalPos() );
 
        } else {
                // Treat single click as an instantaneous drag
                propertyDragStart( ev );
                propertyDragUpdate( ev );
                propertyDragEnd();
        }
}
 
void NotePropertiesRuler::mousePressEvent( QMouseEvent* ev ) {
        if ( ev->x() > m_nActiveWidth ) {
                return;
        }
 
        PatternEditor::mousePressEvent( ev );
 
        auto pHydrogenApp = HydrogenApp::get_instance();
 
        // Hide cursor in case this behavior was selected in the
        // Preferences.
        bool bOldCursorHidden = pHydrogenApp->hideKeyboardCursor();
        pHydrogenApp->setHideKeyboardCursor( true );
 
        // Cursor just got hidden.
        if ( bOldCursorHidden != pHydrogenApp->hideKeyboardCursor() ) {
                // Immediate update to prevent visual delay.
                m_pPatternEditorPanel->getPatternEditorRuler()->update();
                update();
        }
        
        // Update cursor position
        if ( ! pHydrogenApp->hideKeyboardCursor() ) {
                int nColumn = getColumn( ev->x(), /* bUseFineGrained=*/ true );
                if ( ( m_pPattern != nullptr &&
                           nColumn >= (int)m_pPattern->get_length() ) ||
                         nColumn >= MAX_INSTRUMENTS ) {
                        return;
                }
 
                m_pPatternEditorPanel->setCursorPosition( nColumn );
        
                update();
                m_pPatternEditorPanel->getPatternEditorRuler()->update();
        }
}
 
void NotePropertiesRuler::mouseDragStartEvent( QMouseEvent *ev ) {
        if ( m_selection.isMoving() ) {
                prepareUndoAction( ev->x() );
                selectionMoveUpdateEvent( ev );
        } else {
                propertyDragStart( ev );
                propertyDragUpdate( ev );
        }
}
 
void NotePropertiesRuler::mouseDragUpdateEvent( QMouseEvent *ev ) {
        propertyDragUpdate( ev );
}
 
void NotePropertiesRuler::mouseDragEndEvent( QMouseEvent *ev ) {
        propertyDragEnd();
}
 
 
void NotePropertiesRuler::selectionMoveUpdateEvent( QMouseEvent *ev ) {
        if ( m_pPattern == nullptr ) {
                return;
        }
        Hydrogen *pHydrogen = Hydrogen::get_instance();
 
        auto pSelectedInstrument = pHydrogen->getSelectedInstrument();
        if ( pSelectedInstrument == nullptr ) {
                ERRORLOG( "No instrument selected" );
                return;
        }
        
        float fDelta;
 
        QPoint movingOffset = m_selection.movingOffset();
        if ( m_mode == PatternEditor::Mode::NoteKey ) {
                fDelta = (float)-movingOffset.y() / 10;
        } else {
                fDelta = (float)-movingOffset.y() / height();
        }
 
        // Only send a status message for the update in case a single note
        // was selected.
        bool bSendStatusMsg = false;
        int nNotes = 0;
        for ( Note *pNote : m_selection ) {
                ++nNotes;
        }
        if ( nNotes == 1 ) {
                bSendStatusMsg = true;
        }
 
        bool bValueChanged = false;
        for ( Note *pNote : m_selection ) {
                if ( pNote->get_instrument() == pSelectedInstrument || m_selection.isSelected( pNote ) ) {
 
                        // Record original note if not already recorded
                        if ( m_oldNotes.find( pNote ) == m_oldNotes.end() ) {
                                m_oldNotes[ pNote ] = new Note( pNote );
                        }
 
                        adjustNotePropertyDelta( pNote, fDelta, bSendStatusMsg );
                        bValueChanged = true;
                }
        }
 
        if ( bValueChanged ) {
                invalidateBackground();
                update();
        }
}
 
void NotePropertiesRuler::selectionMoveEndEvent( QInputEvent *ev ) {
        addUndoAction();
        invalidateBackground();
        update();
}
 
void NotePropertiesRuler::clearOldNotes() {
        for ( auto it : m_oldNotes ) {
                delete it.second;
        }
        m_oldNotes.clear();
}

void NotePropertiesRuler::selectionMoveCancelEvent() {
        for ( auto it : m_oldNotes ) {
                Note *pNote = it.first, *pOldNote = it.second;
                switch ( m_mode ) {
                case PatternEditor::Mode::Velocity:
                        pNote->set_velocity( pOldNote->get_velocity() );
                        break;
                case PatternEditor::Mode::Pan:
                        pNote->setPan( pOldNote->getPan() );
                        break;
                case PatternEditor::Mode::LeadLag:
                        pNote->set_lead_lag( pOldNote->get_lead_lag() );
                        break;
                case PatternEditor::Mode::NoteKey:
                        pNote->set_key_octave( pOldNote->get_key(), pOldNote->get_octave() );
                        break;
                case PatternEditor::Mode::Probability:
                        pNote->set_probability( pOldNote->get_probability() );
                        break;
                default:
                        break;
                }
        }
 
        if ( m_oldNotes.size() == 0 ) {
                for ( const auto& it : m_oldNotes ){
                        PatternEditor::triggerStatusMessage( it.second, m_mode );
                }
        }
 
        clearOldNotes();
}
 
 
void NotePropertiesRuler::mouseMoveEvent( QMouseEvent *ev )
{
        if ( m_pPattern == nullptr ) {
                return;
        }
        
        if ( ev->buttons() == Qt::NoButton ) {
                int nColumn = getColumn( ev->x() );
                bool bFound = false;
                FOREACH_NOTE_CST_IT_BOUND_LENGTH( m_pPattern->get_notes(), it, nColumn, m_pPattern ) {
                        bFound = true;
                        break;
                }
                if ( bFound ) {
                        setCursor( Qt::PointingHandCursor );
                } else {
                        unsetCursor();
                }
 
        } else {
                PatternEditor::mouseMoveEvent( ev );
        }
}
 
 
void NotePropertiesRuler::propertyDragStart( QMouseEvent *ev )
{
        setCursor( Qt::CrossCursor );
        prepareUndoAction( ev->x() );
        invalidateBackground();
        update();
}
 

void NotePropertiesRuler::prepareUndoAction( int x )
{
        if ( m_pPattern == nullptr ) {
                return;
        }
        Hydrogen *pHydrogen = Hydrogen::get_instance();
 
        clearOldNotes();
 
        auto pSelectedInstrument = pHydrogen->getSelectedInstrument();
        if ( pSelectedInstrument == nullptr ) {
                ERRORLOG( "No instrument selected" );
                return;
        }
 
        if ( m_selection.begin() != m_selection.end() ) {
                // If there is a selection, preserve the initial state of all the selected notes.
                for ( Note *pNote : m_selection ) {
                        if ( pNote->get_instrument() == pSelectedInstrument || m_selection.isSelected( pNote ) ) {
                                m_oldNotes[ pNote ] = new Note( pNote );
                        }
                }
 
        } else {
                // No notes are selected. The target notes to adjust are all those at column given by 'x', so we preserve these.
                int nColumn = getColumn( x );
                FOREACH_NOTE_CST_IT_BOUND_LENGTH( m_pPattern->get_notes(), it,
                                                                                  nColumn, m_pPattern ) {
                        Note *pNote = it->second;
                        if ( pNote->get_instrument() == pSelectedInstrument ) {
                                m_oldNotes[ pNote ] = new Note( pNote );
                        }
                }
        }
}

void NotePropertiesRuler::propertyDragUpdate( QMouseEvent *ev )
{
        if (m_pPattern == nullptr) {
                return;
        }
 
        int nColumn = getColumn( ev->x() );
 
        m_pPatternEditorPanel->setCursorPosition( nColumn );
 
        auto pHydrogenApp = HydrogenApp::get_instance();
        auto pHydrogen = Hydrogen::get_instance();
 
        bool bOldCursorHidden = pHydrogenApp->hideKeyboardCursor();
        pHydrogenApp->setHideKeyboardCursor( true );
 
        if ( m_nDragPreviousColumn != nColumn ) {
                // Complete current undo action, and start a new one.
                addUndoAction();
                prepareUndoAction( ev->x() );
        }
 
        float val = height() - ev->y();
        if (val > height()) {
                val = height();
        }
        else if (val < 0.0) {
                val = 0.0;
        }
        int keyval = val;
        val = val / height(); // val is normalized, in [0;1]
        auto pSelectedInstrument = pHydrogen->getSelectedInstrument();
        if ( pSelectedInstrument == nullptr ) {
                ERRORLOG( "No instrument selected" );
                return;
        }
 
        bool bValueSet = false;
 
        FOREACH_NOTE_CST_IT_BOUND_LENGTH( m_pPattern->get_notes(), it, nColumn, m_pPattern ) {
                Note *pNote = it->second;
 
                if ( pNote->get_instrument() != pSelectedInstrument &&
                         !m_selection.isSelected( pNote ) ) {
                        continue;
                }
                if ( m_mode == PatternEditor::Mode::Velocity && !pNote->get_note_off() ) {
                        pNote->set_velocity( val );
                        m_fLastSetValue = val;
                        bValueSet = true;
                }
                else if ( m_mode == PatternEditor::Mode::Pan && !pNote->get_note_off() ){
                        if ( (ev->button() == Qt::MiddleButton)
                                        || (ev->modifiers() == Qt::ControlModifier && ev->button() == Qt::LeftButton) ) {
                                val = 0.5; // central pan
                        }
                        pNote->setPanWithRangeFrom0To1( val ); // checks the boundaries
                        m_fLastSetValue = pNote->getPanWithRangeFrom0To1();
                        bValueSet = true;
                        
                }
                else if ( m_mode == PatternEditor::Mode::LeadLag ){
                        if ( (ev->button() == Qt::MiddleButton) ||
                                 (ev->modifiers() == Qt::ControlModifier &&
                                  ev->button() == Qt::LeftButton) ) {
                                pNote->set_lead_lag(0.0);
                                m_fLastSetValue = 0.0;
                                bValueSet = true;
                        }
                        else {
                                m_fLastSetValue = val * -2.0 + 1.0;
                                bValueSet = true;
                                pNote->set_lead_lag( m_fLastSetValue );
                        }
                }
                else if ( m_mode == PatternEditor::Mode::NoteKey ){
                        if ( ev->button() != Qt::MiddleButton &&
                                 ! ( ev->modifiers() == Qt::ControlModifier &&
                                         ev->button() == Qt::LeftButton ) ) {
                                //set the note height
                                int k = 666;
                                int o = 666;
                                if( keyval >= 6 && keyval <= 125 ) {
                                        k = ( keyval - 6 ) / 10;
                                }
                                else if( keyval >= 135 && keyval <= 205 ) {
                                        o = ( keyval - 166 ) / 10;
                                        if ( o == -4 ) {
                                                o = -3; // 135
                                        }
                                }
                                m_fLastSetValue = o * 12 + k;
                                bValueSet = true;
                                pNote->set_key_octave((Note::Key)k,(Note::Octave)o); // won't set wrong values see Note::set_key_octave
                        }
                }
                else if ( m_mode == PatternEditor::Mode::Probability && !pNote->get_note_off() ) {
                        m_fLastSetValue = val;
                        bValueSet = true;
                        pNote->set_probability( val );
                }
                
                if ( bValueSet ) {
                        PatternEditor::triggerStatusMessage( pNote, m_mode );
                        m_bValueHasBeenSet = true;
                        Hydrogen::get_instance()->setIsModified( true );
                }
        }
 
        // Cursor just got hidden.
        if ( bOldCursorHidden != pHydrogenApp->hideKeyboardCursor() ) {
                // Immediate update to prevent visual delay.
                m_pPatternEditorPanel->getPatternEditorRuler()->update();
        }
 
        m_nDragPreviousColumn = nColumn;
        invalidateBackground();
        update();
 
        m_pPatternEditorPanel->getPianoRollEditor()->updateEditor();
        m_pPatternEditorPanel->getDrumPatternEditor()->updateEditor();
}
 
void NotePropertiesRuler::propertyDragEnd()
{
        addUndoAction();
        unsetCursor();
        invalidateBackground();
        update();
}

void NotePropertiesRuler::adjustNotePropertyDelta( Note *pNote, float fDelta, bool bMessage )
{
        Note *pOldNote = m_oldNotes[ pNote ];
        assert( pOldNote );
 
        bool bValueSet = false;
        
        switch (m_mode) {
        case PatternEditor::Mode::Velocity:
                if ( !pNote->get_note_off() ) {
                        float fVelocity = qBound(  VELOCITY_MIN, (pOldNote->get_velocity() + fDelta), VELOCITY_MAX );
                        pNote->set_velocity( fVelocity );
                        m_fLastSetValue = fVelocity;
                        bValueSet = true;
                }
                break;
        case PatternEditor::Mode::Pan:
                if ( !pNote->get_note_off() ) {
                        float fVal = pOldNote->getPanWithRangeFrom0To1() + fDelta; // value in [0,1] or slight out of boundaries
                        pNote->setPanWithRangeFrom0To1( fVal ); // checks the boundaries as well
                        m_fLastSetValue = pNote->getPanWithRangeFrom0To1();
                        bValueSet = true;
                }
                break;
        case PatternEditor::Mode::LeadLag:
                {
                        float fLeadLag = qBound( LEAD_LAG_MIN, pOldNote->get_lead_lag() - fDelta, LEAD_LAG_MAX );
                        pNote->set_lead_lag( fLeadLag );
                        m_fLastSetValue = fLeadLag;
                        bValueSet = true;
                }
                break;
        case PatternEditor::Mode::Probability:
                if ( !pNote->get_note_off() ) {
                        float fProbability = qBound( 0.0f, pOldNote->get_probability() + fDelta, 1.0f );
                        pNote->set_probability( fProbability );
                        m_fLastSetValue = fProbability;
                        bValueSet = true;
                }
                break;
        case PatternEditor::Mode::NoteKey:
                int nPitch = qBound( 12 * OCTAVE_MIN, (int)( pOldNote->get_notekey_pitch() + fDelta ),
                                                         12 * OCTAVE_MAX + KEY_MAX );
                Note::Octave octave;
                if ( nPitch >= 0 ) {
                        octave = (Note::Octave)( nPitch / 12 );
                } else {
                        octave = (Note::Octave)( (nPitch-11) / 12 );
                }
                Note::Key key = (Note::Key)( nPitch - 12 * (int)octave );
 
                pNote->set_key_octave( key, octave );
                m_fLastSetValue = 12 * octave + key;
 
                bValueSet = true;
                break;
        }
 
        if ( bValueSet ) {
                Hydrogen::get_instance()->setIsModified( true );
                m_bValueHasBeenSet = true;
                if ( bMessage ) {
                        PatternEditor::triggerStatusMessage( pNote, m_mode );
                }
        }
}
 
void NotePropertiesRuler::keyPressEvent( QKeyEvent *ev )
{
        if ( m_pPattern == nullptr ) {
                return;
        }
        
        auto pHydrogenApp = HydrogenApp::get_instance();
        auto pHydrogen = Hydrogen::get_instance();
        bool bOldCursorHidden = pHydrogenApp->hideKeyboardCursor();
        
        const int nWordSize = 5;
        bool bIsSelectionKey = m_selection.keyPressEvent( ev );
        bool bUnhideCursor = true;
 
        bool bValueChanged = false;
 
        if ( bIsSelectionKey ) {
                // Key was claimed by selection
        } else if ( ev->matches( QKeySequence::MoveToNextChar ) || ev->matches( QKeySequence::SelectNextChar ) ) {
                // ->
                m_pPatternEditorPanel->moveCursorRight();
 
        } else if ( ev->matches( QKeySequence::MoveToNextWord ) || ev->matches( QKeySequence::SelectNextWord ) ) {
                // ->
                m_pPatternEditorPanel->moveCursorRight( nWordSize );
 
        } else if ( ev->matches( QKeySequence::MoveToEndOfLine ) || ev->matches( QKeySequence::SelectEndOfLine ) ) {
                // -->|
                m_pPatternEditorPanel->setCursorPosition( m_pPattern->get_length() );
 
        } else if ( ev->matches( QKeySequence::MoveToPreviousChar ) || ev->matches( QKeySequence::SelectPreviousChar ) ) {
                // <-
                m_pPatternEditorPanel->moveCursorLeft();
 
        } else if ( ev->matches( QKeySequence::MoveToPreviousWord ) || ev->matches( QKeySequence::SelectPreviousWord ) ) {
                // <-
                m_pPatternEditorPanel->moveCursorLeft( nWordSize );
 
        } else if ( ev->matches( QKeySequence::MoveToStartOfLine ) || ev->matches( QKeySequence::SelectStartOfLine ) ) {
                // |<--
                m_pPatternEditorPanel->setCursorPosition(0);
 
        } else {
 
                // Value adjustments
                float fDelta = 0.0;
                bool bRepeatLastValue = false;
 
                if ( ev->matches( QKeySequence::MoveToPreviousLine ) ) {
                        // Key: Up: increase note parameter value
                        fDelta = 0.1;
 
                } else if ( ev->key() == Qt::Key_Up && ev->modifiers() & Qt::AltModifier ) {
                        // Key: Alt+Up: increase parameter slightly
                        fDelta = 0.01;
 
                } else if ( ev->matches( QKeySequence::MoveToNextLine ) ) {
                        // Key: Down: decrease note parameter value
                        fDelta = -0.1;
 
                } else if ( ev->key() == Qt::Key_Down && ev->modifiers() & Qt::AltModifier ) {
                        // Key: Alt+Up: decrease parameter slightly
                        fDelta = -0.01;
 
                } else if ( ev->matches( QKeySequence::MoveToStartOfDocument ) ) {
                        // Key: MoveToStartOfDocument: increase parameter to maximum value
                        fDelta = 1.0;
 
                } else if ( ev->matches( QKeySequence::MoveToEndOfDocument ) ) {
                        // Key: MoveEndOfDocument: decrease parameter to minimum value
                        fDelta = -1.0;
 
                } else if ( ev->key() == Qt::Key_Enter || ev->key() == Qt::Key_Return ) {
                        // Key: Enter/Return: repeat last parameter value set.
                        if ( m_bValueHasBeenSet ) {
                                bRepeatLastValue = true;
                        }
 
                } else if ( ev->matches( QKeySequence::SelectAll ) ) {
                        // Key: Ctrl + A: Select all
                        bUnhideCursor = false;
                        selectAll();
 
                } else if ( ev->matches( QKeySequence::Deselect ) ) {
                        // Key: Shift + Ctrl + A: clear selection
                        bUnhideCursor = false;
                        selectNone();
 
                }
 
                if ( fDelta != 0.0 || bRepeatLastValue ) {
                        int column = m_pPatternEditorPanel->getCursorPosition();
 
                        auto pSelectedInstrument = pHydrogen->getSelectedInstrument();
                        if ( pSelectedInstrument == nullptr ) {
                                ERRORLOG( "No instrument selected" );
                                return;
                        }
                        
                        int nNotes = 0;
 
                        // Collect notes to apply the change to
                        std::list< Note *> notes;
                        if ( m_selection.begin() != m_selection.end() ) {
                                for ( Note *pNote : m_selection ) {
                                        nNotes++;
                                        notes.push_back( pNote );
                                }
                        } else {
                                FOREACH_NOTE_CST_IT_BOUND_LENGTH( m_pPattern->get_notes(), it, column, m_pPattern ) {
                                        Note *pNote = it->second;
                                        assert( pNote );
                                        assert( pNote->get_position() == column );
                                        if ( pNote->get_instrument() == pSelectedInstrument ) {
                                                nNotes++;
                                                notes.push_back( pNote );
                                        }
                                }
                        }
 
                        // For the NoteKeyEditor, adjust the pitch by a whole semitone
                        if ( m_mode == PatternEditor::Mode::NoteKey ) {
                                if ( fDelta > 0.0 ) {
                                        fDelta = 1;
                                } else if ( fDelta < 0.0 ) {
                                        fDelta = -1;
                                }
                        }
 
                        prepareUndoAction( PatternEditor::nMargin + column * m_fGridWidth );
 
                        for ( Note *pNote : notes ) {
                                bValueChanged = true;
 
                                if ( !bRepeatLastValue ) {
                                        
                                        // Apply delta to the property
                                        adjustNotePropertyDelta( pNote, fDelta, nNotes == 1 );
 
                                } else {
 
                                        bool bValueSet = false;
                                        
                                        // Repeating last value
                                        switch (m_mode) {
                                        case PatternEditor::Mode::Velocity:
                                                if ( !pNote->get_note_off() ) {
                                                        pNote->set_velocity( m_fLastSetValue );
                                                        bValueSet = true;
                                                }
                                                break;
                                        case PatternEditor::Mode::Pan:
                                                if ( !pNote->get_note_off() ) {
                                                        if ( m_fLastSetValue > 1. ) { // TODO whats this for? is it ever reached?
                                                                printf( "reached  m_fLastSetValue > 1 in NotePropertiesRuler.cpp\n" );
                                                                pNote->setPanWithRangeFrom0To1( m_fLastSetValue );
                                                        }
                                                        bValueSet = true;
                                                }
                                                break;
                                        case PatternEditor::Mode::LeadLag:
                                                pNote->set_lead_lag( m_fLastSetValue );
                                                        bValueSet = true;
                                                break;
                                        case PatternEditor::Mode::Probability:
                                                if ( !pNote->get_note_off() ) {
                                                        pNote->set_probability( m_fLastSetValue );
                                                        bValueSet = true;
                                                }
                                                break;
                                        case PatternEditor::Mode::NoteKey:
                                                pNote->set_key_octave( (Note::Key)( (int)m_fLastSetValue % 12 ),
                                                                                           (Note::Octave)( (int)m_fLastSetValue / 12 ) );
                                                bValueSet = true;
                                                break;
                                        }
 
                                        if ( bValueSet ) {
                                                if ( nNotes == 1 ) {
                                                        PatternEditor::triggerStatusMessage( pNote, m_mode );
                                                }
                                                Hydrogen::get_instance()->setIsModified( true );
                                        }
                                }
                        }
                        addUndoAction();
                } else {
                        pHydrogenApp->setHideKeyboardCursor( true );
                        ev->ignore();
                        
                        // Cursor either just got hidden.
                        if ( bOldCursorHidden != pHydrogenApp->hideKeyboardCursor() ) {
                                // Immediate update to prevent visual delay.
                                m_pPatternEditorPanel->getPatternEditorRuler()->update();
                                update();
                        }
                        return;
                }
        }
        if ( bUnhideCursor ) {
                pHydrogenApp->setHideKeyboardCursor( false );
        }
 
        // Cursor either just got hidden or was moved.
        if ( ! HydrogenApp::get_instance()->hideKeyboardCursor() || 
                bOldCursorHidden != pHydrogenApp->hideKeyboardCursor() ) {
                // Immediate update to prevent visual delay.
                m_pPatternEditorPanel->getPatternEditorRuler()->update();
        }
 
        m_selection.updateKeyboardCursorPosition( getKeyboardCursorRect() );
        
        if ( bValueChanged ) {
                invalidateBackground();
        }
        update();
        
        ev->accept();
 
}
 
void NotePropertiesRuler::addUndoAction()
{
        if ( m_nSelectedPatternNumber == -1 ) {
                // No pattern selected.
                return;
        }
 
        auto pInstrumentList = Hydrogen::get_instance()->getSong()->getInstrumentList();
        int nSize = m_oldNotes.size();
        if ( nSize != 0 ) {
                QUndoStack *pUndoStack = HydrogenApp::get_instance()->m_pUndoStack;
 
                if ( nSize != 1 ) {
                        pUndoStack->beginMacro( QString( tr( "Edit [%1] property of [%2] notes" ) )
                                                                        .arg( NotePropertiesRuler::modeToQString( m_mode ) )
                                                                        .arg( nSize ) );
                }
                for ( auto it : m_oldNotes ) {
                        Note *pNewNote = it.first, *pOldNote = it.second;
                        pUndoStack->push( new SE_editNotePropertiesVolumeAction( pNewNote->get_position(),
                                                                                                                                         m_mode,
                                                                                                                                         m_nSelectedPatternNumber,
                                                                                                                                         pInstrumentList->index( pNewNote->get_instrument() ),
                                                                                                                                         pNewNote->get_velocity(),
                                                                                                                                         pOldNote->get_velocity(),
                                                                                                                                         pNewNote->getPan(),
                                                                                                                                         pOldNote->getPan(),
                                                                                                                                         pNewNote->get_lead_lag(),
                                                                                                                                         pOldNote->get_lead_lag(),
                                                                                                                                         pNewNote->get_probability(),
                                                                                                                                         pOldNote->get_probability(),
                                                                                                                                         pNewNote->get_key(),
                                                                                                                                         pOldNote->get_key(),
                                                                                                                                         pNewNote->get_octave(),
                                                                                                                                         pOldNote->get_octave() ) );
                }
                if ( nSize != 1 ) {
                        pUndoStack->endMacro();
                }
        }
        clearOldNotes();
}
 
void NotePropertiesRuler::paintEvent( QPaintEvent *ev)
{
        if (!isVisible()) {
                return;
        }
 
        auto pPref = Preferences::get_instance();
        
        qreal pixelRatio = devicePixelRatio();
        if ( pixelRatio != m_pBackgroundPixmap->devicePixelRatio() ||
                 m_bBackgroundInvalid ) {
                createBackground();
        }
 
        QPainter painter(this);
        painter.drawPixmap( ev->rect(), *m_pBackgroundPixmap,
                                                QRectF( pixelRatio * ev->rect().x(),
                                                                pixelRatio * ev->rect().y(),
                                                                pixelRatio * ev->rect().width(),
                                                                pixelRatio * ev->rect().height() ) );
 
        // Draw playhead
        if ( m_nTick != -1 ) {
 
                int nOffset = Skin::getPlayheadShaftOffset();
                int nX = static_cast<int>(static_cast<float>(PatternEditor::nMargin) +
                                                                  static_cast<float>(m_nTick) *
                                                                  m_fGridWidth );
                Skin::setPlayheadPen( &painter, false );
                painter.drawLine( nX, 0, nX, height() );
        }
        
        drawFocus( painter );
        
        m_selection.paintSelection( &painter );
 
        // cursor
        if ( hasFocus() && ! HydrogenApp::get_instance()->hideKeyboardCursor() ) {
                uint x = PatternEditor::nMargin + m_pPatternEditorPanel->getCursorPosition() * m_fGridWidth;
 
                QPen pen( pPref->getColorTheme()->m_cursorColor );
                pen.setWidth( 2 );
                painter.setPen( pen );
                painter.setBrush( Qt::NoBrush );
                painter.setRenderHint( QPainter::Antialiasing );
                painter.drawRoundedRect( QRect( x-m_fGridWidth*3, 0 + 3, m_fGridWidth*6, height() - 6 ), 4, 4 );
        }
}
 
void NotePropertiesRuler::drawFocus( QPainter& painter ) {
 
        if ( ! m_bEntered && ! hasFocus() ) {
                return;
        }
        
        auto pPref = H2Core::Preferences::get_instance();
        
        QColor color = pPref->getColorTheme()->m_highlightColor;
 
        // If the mouse is placed on the widget but the user hasn't
        // clicked it yet, the highlight will be done more transparent to
        // indicate that keyboard inputs are not accepted yet.
        if ( ! hasFocus() ) {
                color.setAlpha( 125 );
        }
 
        const QScrollArea* pScrollArea;
        
        switch ( m_mode ) {
        case PatternEditor::Mode::Velocity:
                pScrollArea = HydrogenApp::get_instance()->getPatternEditorPanel()->getNoteVelocityScrollArea();
                break;
        case PatternEditor::Mode::Pan:
                pScrollArea = HydrogenApp::get_instance()->getPatternEditorPanel()->getNotePanScrollArea();
                break;
        case PatternEditor::Mode::LeadLag:
                pScrollArea = HydrogenApp::get_instance()->getPatternEditorPanel()->getNoteLeadLagScrollArea();
                break;
        case PatternEditor::Mode::NoteKey:
                pScrollArea = HydrogenApp::get_instance()->getPatternEditorPanel()->getNoteNoteKeyScrollArea();
                break;
        case PatternEditor::Mode::Probability:
                pScrollArea = HydrogenApp::get_instance()->getPatternEditorPanel()->getNoteProbabilityScrollArea();
                break;
        default:
                return;
        }
        int nStartY = pScrollArea->verticalScrollBar()->value();
        int nStartX = pScrollArea->horizontalScrollBar()->value();
        int nEndY = nStartY + pScrollArea->viewport()->size().height();
        // In order to match the width used in the DrumPatternEditor.
        int nEndX = std::min( nStartX + pScrollArea->viewport()->size().width(),
                                                  static_cast<int>( m_nEditorWidth ) );
 
        int nMargin;
        if ( nEndX == static_cast<int>( m_nEditorWidth ) ) {
                nEndX = nEndX - 2;
                nMargin = 1;
        } else {
                nMargin = 0;
        }
 
        QPen pen( color );
        pen.setWidth( 4 );
        painter.setPen( pen );
        painter.drawLine( QPoint( nStartX, nStartY ), QPoint( nEndX, nStartY ) );
        painter.drawLine( QPoint( nStartX, nStartY ), QPoint( nStartX, nEndY ) );
        painter.drawLine( QPoint( nEndX, nEndY ), QPoint( nStartX, nEndY ) );
 
        if ( nMargin != 0 ) {
                // Since for all other lines we are drawing at a border with just
                // half of the line being painted in the visual viewport, there
                // has to be some tweaking since the NotePropertiesRuler is
                // paintable to the right.
                pen.setWidth( 2 );
                painter.setPen( pen );
        }
        painter.drawLine( QPoint( nEndX + nMargin, nStartY ), QPoint( nEndX + nMargin, nEndY ) );
                
}
 
void NotePropertiesRuler::scrolled( int nValue ) {
        UNUSED( nValue );
        update();
}
 
void NotePropertiesRuler::enterEvent( QEvent *ev ) {
        UNUSED( ev );
        m_bEntered = true;
        update();
}
 
void NotePropertiesRuler::leaveEvent( QEvent *ev ) {
        UNUSED( ev );
        m_bEntered = false;
        update();
}
 
void NotePropertiesRuler::drawDefaultBackground( QPainter& painter, int nHeight, int nIncrement ) {
        
        auto pPref = H2Core::Preferences::get_instance();
 
        const QColor borderColor( pPref->getColorTheme()->m_patternEditor_lineColor );
        const QColor lineColor( pPref->getColorTheme()->m_patternEditor_line5Color );
        const QColor lineInactiveColor( pPref->getColorTheme()->m_windowTextColor.darker( 170 ) );
        const QColor backgroundColor( pPref->getColorTheme()->m_patternEditor_backgroundColor );
        const QColor backgroundInactiveColor( pPref->getColorTheme()->m_windowColor );
 
        if ( nHeight == 0 ) {
                nHeight = height();
        }
        if ( nIncrement == 0 ) {
                nIncrement = nHeight / 10;
        }
 
        painter.fillRect( 0, 0, m_nActiveWidth, height(), backgroundColor );
        painter.fillRect( m_nActiveWidth, 0, m_nEditorWidth - m_nActiveWidth,
                                          height(), backgroundInactiveColor );
 
        drawGridLines( painter, Qt::DotLine );
        
        painter.setPen( lineColor );
        for (unsigned y = 0; y < nHeight; y += nIncrement ) {
                painter.drawLine( PatternEditor::nMargin, y, m_nActiveWidth, y );
        }
        
        painter.setPen( borderColor );
        painter.drawLine( 0, 0, m_nActiveWidth, 0 );
        painter.drawLine( 0, m_nEditorHeight - 1, m_nActiveWidth, m_nEditorHeight - 1 );
 
        if ( m_nActiveWidth + 1 < m_nEditorWidth ) {
                painter.setPen( lineInactiveColor );
                for (unsigned y = 0; y < nHeight; y += nIncrement ) {
                        painter.drawLine( m_nActiveWidth, y, m_nEditorWidth, y );
                }
        
                painter.drawLine( m_nActiveWidth, 0, m_nEditorWidth, 0 );
                painter.drawLine( m_nActiveWidth, m_nEditorHeight - 1,
                                                  m_nEditorWidth, m_nEditorHeight - 1 );
        }
}
 
void NotePropertiesRuler::createNormalizedBackground(QPixmap *pixmap)
{
        auto pPref = H2Core::Preferences::get_instance();
        auto pHydrogen = Hydrogen::get_instance();
 
        QColor borderColor( pPref->getColorTheme()->m_patternEditor_lineColor );
        const QColor lineInactiveColor( pPref->getColorTheme()->m_windowTextColor.darker( 170 ) );
        QPainter p( pixmap );
 
        drawDefaultBackground( p );
 
        // draw velocity lines
        if ( m_pPattern != nullptr ) {
                auto pSelectedInstrument = pHydrogen->getSelectedInstrument();
                if ( pSelectedInstrument == nullptr ) {
                        ERRORLOG( "No instrument selected" );
                        return;
                }
 
                QPen selectedPen( selectedNoteColor() );
                selectedPen.setWidth( 2 );
 
                const Pattern::notes_t* notes = m_pPattern->get_notes();
                FOREACH_NOTE_CST_IT_BEGIN_LENGTH(notes,it, m_pPattern) {
                        Note *pposNote = it->second;
                        assert( pposNote );
                        uint pos = pposNote->get_position();
                        int xoffset = 0;
                        FOREACH_NOTE_CST_IT_BOUND_LENGTH(notes,coit,pos, m_pPattern) {
                                Note *pNote = coit->second;
                                assert( pNote );
                                if ( pNote->get_instrument() != pSelectedInstrument
                                         && !m_selection.isSelected( pNote ) ) {
                                        continue;
                                }
                                uint x_pos = PatternEditor::nMargin + pos * m_fGridWidth;
                                uint line_end = height();
 
 
                                uint value = 0;
                                if ( m_mode == PatternEditor::Mode::Velocity ) {
                                        value = (uint)(pNote->get_velocity() * height());
                                }
                                else if ( m_mode == PatternEditor::Mode::Probability ) {
                                        value = (uint)(pNote->get_probability() * height());
                                }
                                uint line_start = line_end - value;
                                QColor noteColor = DrumPatternEditor::computeNoteColor( pNote->get_velocity() );
                                int nLineWidth = 3;
 
                                p.fillRect( x_pos - 1 + xoffset, line_start,
                                                        nLineWidth, line_end - line_start,
                                                        noteColor );
                                p.setPen( QPen( Qt::black, 1 ) );
                                p.setRenderHint( QPainter::Antialiasing );
                                p.drawRoundedRect( x_pos - 1 - 1 + xoffset, line_start - 1,
                                                                   nLineWidth + 2, line_end - line_start + 2, 2, 2 );
                                
                                if ( m_selection.isSelected( pNote ) ) {
                                        p.setPen( selectedPen );
                                        p.setRenderHint( QPainter::Antialiasing );
                                        p.drawRoundedRect( x_pos - 1 -2 + xoffset, line_start - 2,
                                                                           nLineWidth + 4,  line_end - line_start + 4 ,
                                                                           4, 4 );
                                }
                                xoffset++;
                        }
                }
        }
        
        p.setPen( borderColor );
        p.setRenderHint( QPainter::Antialiasing );
        p.drawLine( 0, 0, m_nEditorWidth, 0 );
        p.setPen( QPen( borderColor, 2 ) );
        p.drawLine( 0, m_nEditorHeight, m_nEditorWidth, m_nEditorHeight );
        
        if ( m_nActiveWidth + 1 < m_nEditorWidth ) {
                p.setPen( lineInactiveColor );
                p.drawLine( m_nActiveWidth, 0, m_nEditorWidth, 0 );
                p.setPen( QPen( lineInactiveColor, 2 ) );
                p.drawLine( m_nActiveWidth, m_nEditorHeight,
                                        m_nEditorWidth, m_nEditorHeight );
        }
}
 
void NotePropertiesRuler::createCenteredBackground(QPixmap *pixmap)
{
        auto pPref = H2Core::Preferences::get_instance();
        auto pHydrogen = Hydrogen::get_instance();
        
        QColor baseLineColor( pPref->getColorTheme()->m_patternEditor_lineColor );
        QColor borderColor( pPref->getColorTheme()->m_patternEditor_lineColor );
        const QColor lineInactiveColor( pPref->getColorTheme()->m_windowTextColor.darker( 170 ) );
 
        QPainter p( pixmap );
 
        drawDefaultBackground( p );
 
        // central line
        p.setPen( baseLineColor );
        p.drawLine(0, height() / 2.0, m_nActiveWidth, height() / 2.0);
        if ( m_nActiveWidth + 1 < m_nEditorWidth ) {
                p.setPen( lineInactiveColor );
                p.drawLine( m_nActiveWidth, height() / 2.0,
                                        m_nEditorWidth, height() / 2.0);
        }
 
        if ( m_pPattern != nullptr ) {
                auto pSelectedInstrument = pHydrogen->getSelectedInstrument();
                if ( pSelectedInstrument == nullptr ) {
                        ERRORLOG( "No instrument selected" );
                        return;
                }
                
                QPen selectedPen( selectedNoteColor() );
                selectedPen.setWidth( 2 );
 
                const Pattern::notes_t* notes = m_pPattern->get_notes();
                FOREACH_NOTE_CST_IT_BEGIN_LENGTH(notes,it, m_pPattern) {
                        Note *pposNote = it->second;
                        assert( pposNote );
                        uint pos = pposNote->get_position();
                        int xoffset = 0;
                        FOREACH_NOTE_CST_IT_BOUND_LENGTH(notes,coit,pos, m_pPattern) {
                                Note *pNote = coit->second;
                                assert( pNote );
                                if ( pNote->get_note_off() || (pNote->get_instrument()
                                                                                           != pSelectedInstrument
                                                                                           && !m_selection.isSelected( pNote ) ) ) {
                                        continue;
                                }
                                uint x_pos = PatternEditor::nMargin + pNote->get_position() * m_fGridWidth;
                                QColor noteColor = DrumPatternEditor::computeNoteColor( pNote->get_velocity() );
 
                                p.setPen( Qt::NoPen );
 
                                float fValue = 0;
                                if ( m_mode == PatternEditor::Mode::Pan ) {
                                        fValue = pNote->getPan();
                                } else if ( m_mode == PatternEditor::Mode::LeadLag ) {
                                        fValue = -1 * pNote->get_lead_lag();
                                }
 
                                // Rounding in order to not miss the center due to
                                // rounding errors introduced in the Note class
                                // internals.
                                fValue *= 100;
                                fValue = std::round( fValue );
                                fValue /= 100;
 
                                int nLineWidth = 3;
                                p.setPen( QPen( Qt::black, 1 ) );
                                p.setRenderHint( QPainter::Antialiasing );
                                if ( fValue == 0.f ) {
                                        // value is centered - draw circle
                                        int y_pos = (int)( height() * 0.5 );
                                        p.setBrush(QColor( noteColor ));
                                        p.drawEllipse( x_pos-4 + xoffset, y_pos-4, 8, 8);
                                        p.setBrush( Qt::NoBrush );
 
                                        if ( m_selection.isSelected( pNote ) ) {
                                                p.setPen( selectedPen );
                                                p.setRenderHint( QPainter::Antialiasing );
                                                p.drawEllipse( x_pos - 6 + xoffset, y_pos - 6,
                                                                           12, 12);
                                        }
                                }
                                else {
                                        // value was altered - draw a rectangle
                                        int nHeight = 0.5 * height() * std::abs( fValue ) + 5;
                                        int nStartY = height() * 0.5 - 2;
                                        if ( fValue >= 0 ) {
                                                nStartY = nStartY - nHeight + 5;
                                        }
 
                                        p.fillRect( x_pos - 1 + xoffset, nStartY,
                                                                nLineWidth, nHeight, QColor( noteColor ) );
                                        p.drawRoundedRect( x_pos - 1 + xoffset - 1, nStartY - 1,
                                                                           nLineWidth + 2, nHeight + 2, 2, 2 );
 
                                        if ( m_selection.isSelected( pNote ) ) {
                                                p.setPen( selectedPen );
                                                p.drawRoundedRect( x_pos - 1 - 2 + xoffset, nStartY - 2,
                                                                                   nLineWidth + 4, nHeight + 4,
                                                                                   4, 4 );
                                        }
                                }
                                xoffset++;
                        }
                }
        }
 
        
        p.setPen( borderColor );
        p.setRenderHint( QPainter::Antialiasing );
        p.drawLine( 0, 0, m_nEditorWidth, 0 );
        p.setPen( QPen( borderColor, 2 ) );
        p.drawLine( 0, m_nEditorHeight, m_nEditorWidth, m_nEditorHeight );
        
        if ( m_nActiveWidth + 1 < m_nEditorWidth ) {
                p.setPen( lineInactiveColor );
                p.drawLine( m_nActiveWidth, 0, m_nEditorWidth, 0 );
                p.setPen( QPen( lineInactiveColor, 2 ) );
                p.drawLine( m_nActiveWidth, m_nEditorHeight,
                                        m_nEditorWidth, m_nEditorHeight );
        }
}
 
void NotePropertiesRuler::createNoteKeyBackground(QPixmap *pixmap)
{
        auto pPref = H2Core::Preferences::get_instance();
        QColor backgroundColor = pPref->getColorTheme()->m_patternEditor_backgroundColor;
        const QColor backgroundInactiveColor( pPref->getColorTheme()->m_windowColor );
        QColor alternateRowColor = pPref->getColorTheme()->m_patternEditor_alternateRowColor;
        QColor octaveColor = pPref->getColorTheme()->m_patternEditor_octaveRowColor;
        QColor lineColor( pPref->getColorTheme()->m_patternEditor_lineColor );
        const QColor lineInactiveColor( pPref->getColorTheme()->m_windowTextColor.darker( 170 ) );
        QColor textColor( pPref->getColorTheme()->m_patternEditor_textColor );
 
        QPainter p( pixmap );
        p.fillRect( 0, 0, m_nEditorWidth, m_nEditorHeight, backgroundInactiveColor );
        drawDefaultBackground( p, 80, 10 );
 
        // fill the background of the key region;
        for ( unsigned y = 90; y < 210; y = y + 10 ) {
                
                if ( y == 100 || y == 120 || y == 140 || y == 170 || y == 190) {
                        p.setPen( QPen( alternateRowColor,
                                                        9, Qt::SolidLine, Qt::FlatCap ) );
                }
                else {
                        p.setPen( QPen( octaveColor, 9, Qt::SolidLine, Qt::FlatCap) );
                }
                                        
                p.drawLine( PatternEditor::nMargin, y, m_nActiveWidth, y );
        }
 
        // Annotate with note class names
        static QString noteNames[] = { tr( "B" ), tr( "A#" ), tr( "A" ), tr( "G#" ), tr( "G" ), tr( "F#" ),
                                                                   tr( "F" ), tr( "E" ), tr( "D#" ), tr( "D" ), tr( "C#" ), tr( "C" ) };
        
        QFont font( pPref->getApplicationFontFamily(), getPointSize( pPref->getFontSize() ) );
        
        p.setFont( font );
        p.setPen( textColor );
        for ( int n = 0; n < 12; n++ ) {
                p.drawText( 3, 90 + 10 * n +3, noteNames[n] );
        }
 
        // Horizontal grid lines in the key region
        p.setPen( QPen( lineColor, 1, Qt::SolidLine));
        for (unsigned y = 90; y <= 210; y = y + 10 ) {
                p.drawLine( PatternEditor::nMargin, y - 5, m_nActiveWidth, y-5);
        }
 
        if ( m_nActiveWidth + 1 < m_nEditorWidth ) {
                p.setPen( lineInactiveColor );
                for (unsigned y = 90; y <= 210; y = y + 10 ) {
                        p.drawLine( m_nActiveWidth, y - 5, m_nEditorWidth, y-5);
                }
        }
 
        if ( m_pPattern != nullptr ) {
                auto pSelectedInstrument = Hydrogen::get_instance()->getSelectedInstrument();
                if ( pSelectedInstrument == nullptr ) {
                        DEBUGLOG( "No instrument selected" );
                        return;
                }
                QPen selectedPen( selectedNoteColor() );
                selectedPen.setWidth( 2 );
 
                const Pattern::notes_t* notes = m_pPattern->get_notes();
                FOREACH_NOTE_CST_IT_BEGIN_LENGTH(notes,it, m_pPattern) {
                        Note *pNote = it->second;
                        assert( pNote );
                        if ( pNote->get_instrument() != pSelectedInstrument
                                 && !m_selection.isSelected( pNote ) ) {
                                continue;
                        }
                        if ( !pNote->get_note_off() ) {
                                //paint the octave
                                uint x_pos = 17 + pNote->get_position() * m_fGridWidth;
                                uint y_pos = (4-pNote->get_octave())*10-3;
                                p.setBrush( DrumPatternEditor::computeNoteColor( pNote->get_velocity() ) );
                                p.drawEllipse( x_pos, y_pos, 6, 6);
 
                                //paint note
                                int d = 8;
                                int k = pNote->get_key();
                                x_pos = 16 + pNote->get_position() * m_fGridWidth;
                                y_pos = 200-(k*10)-4;
 
                                x_pos -= 1;
                                y_pos -= 1;
                                d += 2;
                                p.setPen( QPen( Qt::black, 1 ) );
                                p.setBrush( DrumPatternEditor::computeNoteColor( pNote->get_velocity() ) );
                                p.drawEllipse( x_pos, y_pos, d, d);
 
                                // Paint selection outlines
                                int nLineWidth = 3;
                                if ( m_selection.isSelected( pNote ) ) {
                                        p.setPen( selectedPen );
                                        p.setBrush( Qt::NoBrush );
                                        p.setRenderHint( QPainter::Antialiasing );
                                        p.drawRoundedRect( x_pos - 1 -2 +3, 2,
                                                                           nLineWidth + 4 + 4,  height() - 4,
                                                                           4, 4 );
                                }
                        }
                }
        }
        
        p.setPen( lineColor );
        p.setRenderHint( QPainter::Antialiasing );
        p.drawLine( 0, 0, m_nEditorWidth, 0 );
        p.setPen( QPen( lineColor, 2 ) );
        p.drawLine( 0, m_nEditorHeight, m_nEditorWidth, m_nEditorHeight );
        
        if ( m_nActiveWidth + 1 < m_nEditorWidth ) {
                p.setPen( lineInactiveColor );
                p.drawLine( m_nActiveWidth, 0, m_nEditorWidth, 0 );
                p.setPen( QPen( lineInactiveColor, 2 ) );
                p.drawLine( m_nActiveWidth, m_nEditorHeight,
                                        m_nEditorWidth, m_nEditorHeight );
        }
}
 
 
void NotePropertiesRuler::updateEditor( bool )
{
        Hydrogen *pHydrogen = Hydrogen::get_instance();
        PatternList *pPatternList = pHydrogen->getSong()->getPatternList();
        int nSelectedPatternNumber = pHydrogen->getSelectedPatternNumber();
        if ( (nSelectedPatternNumber != -1) && ( (uint)nSelectedPatternNumber < pPatternList->size() ) ) {
                m_pPattern = pPatternList->get( nSelectedPatternNumber );
        }
        else {
                m_pPattern = nullptr;
        }
        m_nSelectedPatternNumber = nSelectedPatternNumber;
 
        updateWidth();
        resize( m_nEditorWidth, height() );
 
        invalidateBackground();
        update();
}
 
void NotePropertiesRuler::createBackground()
{
        qreal pixelRatio = devicePixelRatio();
        if ( m_pBackgroundPixmap->width() != m_nEditorWidth ||
                 m_pBackgroundPixmap->height() != m_nEditorHeight ||
                 m_pBackgroundPixmap->devicePixelRatio() != pixelRatio ) {
                delete m_pBackgroundPixmap;
                m_pBackgroundPixmap = new QPixmap( m_nEditorWidth * pixelRatio ,
                                                                                   m_nEditorHeight * pixelRatio );
                m_pBackgroundPixmap->setDevicePixelRatio( pixelRatio );
        }
 
        if ( m_mode == PatternEditor::Mode::Velocity ||
                 m_mode == PatternEditor::Mode::Probability ) {
                createNormalizedBackground( m_pBackgroundPixmap );
        }
        else if ( m_mode == PatternEditor::Mode::Pan ||
                          m_mode == PatternEditor::Mode::LeadLag ) {
                createCenteredBackground( m_pBackgroundPixmap );
        }
        else if ( m_mode == PatternEditor::Mode::NoteKey ) {
                createNoteKeyBackground( m_pBackgroundPixmap );
        }
        
        m_bBackgroundInvalid = false;
}
 
 
void NotePropertiesRuler::selectedPatternChangedEvent()
{
        updateEditor();
}
 
void NotePropertiesRuler::selectedInstrumentChangedEvent()
{
        updateEditor();
}
 
void NotePropertiesRuler::songModeActivationEvent() {
        updateEditor();
}
 
std::vector<NotePropertiesRuler::SelectionIndex> NotePropertiesRuler::elementsIntersecting( QRect r ) {
        std::vector<SelectionIndex> result;
        if ( m_pPattern == nullptr ) {
                return std::move( result );
        }
        
        auto pHydrogen = Hydrogen::get_instance();
        
        const Pattern::notes_t* notes = m_pPattern->get_notes();
        auto pSelectedInstrument = pHydrogen->getSelectedInstrument();
        if ( pSelectedInstrument == nullptr ) {
                ERRORLOG( "No instrument selected" );
                return std::move( result );
        }
 
        // Account for the notional active area of the slider. We allow a
        // width of 8 as this is the size of the circle used for the zero
        // position on the lead/lag editor.
        r = r.normalized();
        if ( r.top() == r.bottom() && r.left() == r.right() ) {
                r += QMargins( 2, 2, 2, 2 );
        }
        r += QMargins( 4, 4, 4, 4 );
 
        FOREACH_NOTE_CST_IT_BEGIN_LENGTH(notes,it, m_pPattern) {
                if ( it->second->get_instrument() != pSelectedInstrument
                         && !m_selection.isSelected( it->second ) ) {
                        continue;
                }
 
                int pos = it->first;
                uint x_pos = PatternEditor::nMargin + pos * m_fGridWidth;
                if ( r.intersects( QRect( x_pos, 0, 1, height() ) ) ) {
                        result.push_back( it->second );
                }
        }
 
        // Updating selection, we may need to repaint the whole widget.
        invalidateBackground();
        update();
 
        return std::move(result);
}

QRect NotePropertiesRuler::getKeyboardCursorRect()
{
        uint x = PatternEditor::nMargin +
                m_pPatternEditorPanel->getCursorPosition() * m_fGridWidth;
        return QRect( x-m_fGridWidth*3, 3, m_fGridWidth*6, height()-6 );
}
 
void NotePropertiesRuler::selectAll()
{
        selectInstrumentNotes( Hydrogen::get_instance()->getSelectedInstrumentNumber() );
}
 
void NotePropertiesRuler::onPreferencesChanged( H2Core::Preferences::Changes changes )
{
        if ( changes & ( H2Core::Preferences::Changes::Colors |
                                         H2Core::Preferences::Changes::Font ) ) {
 
                invalidateBackground();
                update();
        }
}