root/branches/new_fx_rack_and_sample_fun/gui/src/PatternEditor/DrumPatternEditor.cpp @ 676

/*
 * Hydrogen
 * Copyright(c) 2002-2008 by Alex >Comix< Cominu [comix@users.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, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 */

#include "DrumPatternEditor.h"
#include "PatternEditorPanel.h"
#include "NotePropertiesRuler.h"

#include <hydrogen/globals.h>
#include <hydrogen/Song.h>
#include <hydrogen/hydrogen.h>
#include <hydrogen/Preferences.h>
#include <hydrogen/event_queue.h>
#include <hydrogen/instrument.h>
#include <hydrogen/Pattern.h>
#include <hydrogen/note.h>
#include <hydrogen/audio_engine.h>

#include "../HydrogenApp.h"
#include "../Mixer/Mixer.h"
#include "../Skin.h"

#include <cassert>
#include <algorithm>

#include <QtGui>

using namespace std;
using namespace H2Core;

DrumPatternEditor::DrumPatternEditor(QWidget* parent, PatternEditorPanel *panel)
 : QWidget( parent )
 , Object( "DrumPatternEditor" )
 , m_nResolution( 8 )
 , m_bUseTriplets( false )
 , m_bRightBtnPressed( false )
 , m_pDraggedNote( NULL )
 , m_pPattern( NULL )
 , m_pPatternEditorPanel( panel )
{
        //setAttribute(Qt::WA_NoBackground);
        setFocusPolicy(Qt::ClickFocus);

        m_nGridWidth = Preferences::getInstance()->getPatternEditorGridWidth();
        m_nGridHeight = Preferences::getInstance()->getPatternEditorGridHeight();

        unsigned nEditorWidth = 20 + m_nGridWidth * ( MAX_NOTES * 4 );
        m_nEditorHeight = m_nGridHeight * MAX_INSTRUMENTS;

        resize( nEditorWidth, m_nEditorHeight );

        HydrogenApp::getInstance()->addEventListener( this );
        
}



DrumPatternEditor::~DrumPatternEditor()
{
}



void DrumPatternEditor::updateEditor()
{
        Hydrogen* engine = Hydrogen::get_instance();

        // check engine state
        int state = engine->getState();
        if ( (state != STATE_READY) && (state != STATE_PLAYING) ) {
                ERRORLOG( "FIXME: skipping pattern editor update (state shoud be READY or PLAYING)" );
                return;
        }

        Hydrogen *pEngine = Hydrogen::get_instance();
        PatternList *pPatternList = pEngine->getSong()->get_pattern_list();
        int nSelectedPatternNumber = pEngine->getSelectedPatternNumber();
        if ( (nSelectedPatternNumber != -1) && ( (uint)nSelectedPatternNumber < pPatternList->get_size() ) ) {
                m_pPattern = pPatternList->get( nSelectedPatternNumber );
        }
        else {
                m_pPattern = NULL;
        }


        uint nEditorWidth;
        if ( m_pPattern ) {
                nEditorWidth = 20 + m_nGridWidth * m_pPattern->get_lenght();
        }
        else {
                nEditorWidth = 20 + m_nGridWidth * MAX_NOTES;
        }
        resize( nEditorWidth, height() );

        // redraw all
        update( 0, 0, width(), height() );
}



int DrumPatternEditor::getColumn(QMouseEvent *ev)
{
        int nBase;
        if (m_bUseTriplets) {
                nBase = 3;
        }
        else {
                nBase = 4;
        }
        int nWidth = (m_nGridWidth * 4 * MAX_NOTES) / (nBase * m_nResolution);

        int x = ev->x();
        int nColumn;
        nColumn = x - 20 + (nWidth / 2);
        nColumn = nColumn / nWidth;
        nColumn = (nColumn * 4 * MAX_NOTES) / (nBase * m_nResolution);
        return nColumn;
}



void DrumPatternEditor::mousePressEvent(QMouseEvent *ev)
{
        if ( m_pPattern == NULL ) {
                return;
        }
        Song *pSong = Hydrogen::get_instance()->getSong();
        int nInstruments = pSong->get_instrument_list()->get_size();

        int row = (int)( ev->y()  / (float)m_nGridHeight);
        if (row >= nInstruments) {
                return;
        }

        int nColumn = getColumn( ev );

        if ( nColumn >= (int)m_pPattern->get_lenght() ) {
                update( 0, 0, width(), height() );
                return;
        }
        Instrument *pSelectedInstrument = pSong->get_instrument_list()->get( row );

        if (ev->button() == Qt::LeftButton ) {
                m_bRightBtnPressed = false;
                AudioEngine::get_instance()->lock( "DrumPatternEditor::mousePressEvent" );      // lock the audio engine

                bool bNoteAlreadyExist = false;
                std::multimap <int, Note*>::iterator pos;
                for ( pos = m_pPattern->note_map.lower_bound( nColumn ); pos != m_pPattern->note_map.upper_bound( nColumn ); ++pos ) {
                        Note *pNote = pos->second;
                        assert( pNote );
                        if ( pNote->get_instrument() == pSelectedInstrument ) {
                                // the note exists...remove it!
                                bNoteAlreadyExist = true;
                                delete pNote;
                                m_pPattern->note_map.erase( pos );
                                break;
                        }
                }

                if ( bNoteAlreadyExist == false ) {
                        // create the new note
                        const unsigned nPosition = nColumn;
                        const float fVelocity = 0.8f;
                        const float fPan_L = 0.5f;
                        const float fPan_R = 0.5f;
                        const int nLength = -1;
                        const float fPitch = 0.0f;
                        Note *pNote = new Note( pSelectedInstrument, nPosition, fVelocity, fPan_L, fPan_R, nLength, fPitch );
                        pNote->set_noteoff( false );
                        m_pPattern->note_map.insert( std::make_pair( nPosition, pNote ) );

                        // hear note
                        Preferences *pref = Preferences::getInstance();
                        if ( pref->getHearNewNotes() ) {
                                Note *pNote2 = new Note( pSelectedInstrument, 0, fVelocity, fPan_L, fPan_R, nLength, fPitch);
                                AudioEngine::get_instance()->get_sampler()->note_on(pNote2);
                        }
                }
                pSong->__is_modified = true;
                AudioEngine::get_instance()->unlock(); // unlock the audio engine
        }
        else if (ev->button() == Qt::RightButton ) {
                m_bRightBtnPressed = true;
                m_pDraggedNote = NULL;

                int nRealColumn = (ev->x() - 20) / static_cast<float>(m_nGridWidth);

                AudioEngine::get_instance()->lock( "DrumPatternEditor::mousePressEvent" );

                std::multimap <int, Note*>::iterator pos;
                for ( pos = m_pPattern->note_map.lower_bound( nColumn ); pos != m_pPattern->note_map.upper_bound( nColumn ); ++pos ) {
                        Note *pNote = pos->second;
                        assert( pNote );

                        if ( pNote->get_instrument() == pSelectedInstrument ) {
                                m_pDraggedNote = pNote;
                                break;
                        }
                }
                if ( !m_pDraggedNote ) {
                        for ( pos = m_pPattern->note_map.lower_bound( nRealColumn ); pos != m_pPattern->note_map.upper_bound( nRealColumn ); ++pos ) {
                                Note *pNote = pos->second;
                                assert( pNote );

                                if ( pNote->get_instrument() == pSelectedInstrument ) {
                                        m_pDraggedNote = pNote;
                                        break;
                                }
                        }       
///
                        if ( Preferences::getInstance()->__rightclickedpattereditor ){
                                // create the new note
                                const unsigned nPosition = nColumn;
                                const float fVelocity = 0.0f;
                                const float fPan_L = 0.5f;
                                const float fPan_R = 0.5f;
                                const int nLength = 1;
                                const float fPitch = 0.0f;
                                Note *poffNote = new Note( pSelectedInstrument, nPosition, fVelocity, fPan_L, fPan_R, nLength, fPitch);
                                poffNote->set_noteoff( true );
        
                                
                                m_pPattern->note_map.insert( std::make_pair( nPosition, poffNote ) );
        
                                pSong->__is_modified = true;
                        }
///
                }
                // potrei essere sulla coda di una nota precedente..
                for ( int nCol = 0; nCol < nRealColumn; ++nCol ) {
                        if ( m_pDraggedNote ) break;
                        for ( pos = m_pPattern->note_map.lower_bound( nCol ); pos != m_pPattern->note_map.upper_bound( nCol ); ++pos ) {
                                Note *pNote = pos->second;
                                assert( pNote );

                                if ( pNote->get_instrument() == pSelectedInstrument ) {
                                        m_pDraggedNote = pNote;
                                        break;
                                }
                        }
                }
                AudioEngine::get_instance()->unlock();
        }

        // update the selected line
        int nSelectedInstrument = Hydrogen::get_instance()->getSelectedInstrumentNumber();
        if (nSelectedInstrument != row) {
                Hydrogen::get_instance()->setSelectedInstrumentNumber( row );
        }
        else {
                update( 0, 0, width(), height() );
                m_pPatternEditorPanel->getVelocityEditor()->updateEditor();
                m_pPatternEditorPanel->getPanEditor()->updateEditor();
                m_pPatternEditorPanel->getLeadLagEditor()->updateEditor();
                m_pPatternEditorPanel->getNoteKeyEditor()->updateEditor();
        }
}



void DrumPatternEditor::mouseReleaseEvent(QMouseEvent *ev)
{
        UNUSED( ev );
        setCursor( QCursor( Qt::ArrowCursor ) );

        if (m_pPattern == NULL) {
                return;
        }
}



void DrumPatternEditor::mouseMoveEvent(QMouseEvent *ev)
{
        if (m_pPattern == NULL) {
                return;
        }

        int row = MAX_INSTRUMENTS - 1 - (ev->y()  / (int)m_nGridHeight);
        if (row >= MAX_INSTRUMENTS) {
                return;
        }

        if ( Preferences::getInstance()->__rightclickedpattereditor )
                return;

        if (m_bRightBtnPressed && m_pDraggedNote ) {
                if ( m_pDraggedNote->get_noteoff() ) return;
                int nTickColumn = getColumn( ev );

                AudioEngine::get_instance()->lock("DrumPatternEditor::mouseMoveEvent"); // lock the audio engine
                int nLen = nTickColumn - (int)m_pDraggedNote->get_position();

                if (nLen <= 0) {
                        nLen = -1;
                }

                float fNotePitch = m_pDraggedNote->m_noteKey.m_nOctave * 12 + m_pDraggedNote->m_noteKey.m_key;
                float fStep = pow( 1.0594630943593, ( double )fNotePitch );

                m_pDraggedNote->set_lenght( nLen * fStep);

                Hydrogen::get_instance()->getSong()->__is_modified = true;
                AudioEngine::get_instance()->unlock(); // unlock the audio engine

                //__draw_pattern();
                update( 0, 0, width(), height() );
                m_pPatternEditorPanel->getVelocityEditor()->updateEditor();
                m_pPatternEditorPanel->getPanEditor()->updateEditor();
                m_pPatternEditorPanel->getLeadLagEditor()->updateEditor();
                m_pPatternEditorPanel->getNoteKeyEditor()->updateEditor();
        }

}



void DrumPatternEditor::keyPressEvent (QKeyEvent *ev)
{
        ev->ignore();
}



///
/// Draws a pattern
///
void DrumPatternEditor::__draw_pattern(QPainter& painter)
{
        const UIStyle *pStyle = Preferences::getInstance()->getDefaultUIStyle();
        const QColor selectedRowColor( pStyle->m_patternEditor_selectedRowColor.getRed(), pStyle->m_patternEditor_selectedRowColor.getGreen(), pStyle->m_patternEditor_selectedRowColor.getBlue() );

        __create_background( painter );

        if (m_pPattern == NULL) {
                return;
        }

        int nNotes = m_pPattern->get_lenght();
        int nSelectedInstrument = Hydrogen::get_instance()->getSelectedInstrumentNumber();
        Song *pSong = Hydrogen::get_instance()->getSong();

        InstrumentList * pInstrList = pSong->get_instrument_list();

        

        if ( m_nEditorHeight != (int)( m_nGridHeight * pInstrList->get_size() ) ) {
                // the number of instruments is changed...recreate all
                m_nEditorHeight = m_nGridHeight * pInstrList->get_size();
                resize( width(), m_nEditorHeight );
        }

        for ( uint nInstr = 0; nInstr < pInstrList->get_size(); ++nInstr ) {
                uint y = m_nGridHeight * nInstr;
                if ( nInstr == (uint)nSelectedInstrument ) {    // selected instrument
                        painter.fillRect( 0, y + 1, ( 20 + nNotes * m_nGridWidth ), m_nGridHeight - 1, selectedRowColor );
                }
        }


        // draw the grid
        __draw_grid( painter );
        

        /*
                BUGFIX
                
                if m_pPattern is not renewed every time we draw a note, 
                hydrogen will crash after you save a song and create a new one. 
                -smoors
        */
        Hydrogen *pEngine = Hydrogen::get_instance();
        PatternList *pPatternList = pEngine->getSong()->get_pattern_list();
        int nSelectedPatternNumber = pEngine->getSelectedPatternNumber();
        if ( (nSelectedPatternNumber != -1) && ( (uint)nSelectedPatternNumber < pPatternList->get_size() ) ) {
                m_pPattern = pPatternList->get( nSelectedPatternNumber );
        }
        else {
                m_pPattern = NULL;
        }
        // ~ FIX



        if( m_pPattern->note_map.size() == 0) return;

        std::multimap <int, Note*>::iterator pos;
        for ( pos = m_pPattern->note_map.begin(); pos != m_pPattern->note_map.end(); pos++ ) {
                Note *note = pos->second;
                assert( note );
                __draw_note( note, painter );
        }
}


///
/// Draws a note
///
void DrumPatternEditor::__draw_note( Note *note, QPainter& p )
{
        static const UIStyle *pStyle = Preferences::getInstance()->getDefaultUIStyle();
        static const QColor noteColor( pStyle->m_patternEditor_noteColor.getRed(), pStyle->m_patternEditor_noteColor.getGreen(), pStyle->m_patternEditor_noteColor.getBlue() );
        static const QColor noteoffColor( pStyle->m_patternEditor_noteoffColor.getRed(), pStyle->m_patternEditor_noteoffColor.getGreen(), pStyle->m_patternEditor_noteoffColor.getBlue() );

        p.setRenderHint( QPainter::Antialiasing );

        int nInstrument = -1;
        InstrumentList * pInstrList = Hydrogen::get_instance()->getSong()->get_instrument_list();
        for ( uint nInstr = 0; nInstr < pInstrList->get_size(); ++nInstr ) {
                Instrument *pInstr = pInstrList->get( nInstr );
                if ( pInstr == note->get_instrument() ) {
                        nInstrument = nInstr;
                        break;
                }
        }
        if ( nInstrument == -1 ) {
                ERRORLOG( "Instrument not found..skipping note" );
                return;
        }

        uint pos = note->get_position();

        p.setPen( noteColor );

        if ( note->get_lenght() == -1 && note->get_noteoff() == false ) {       // trigger note
                uint x_pos = 20 + (pos * m_nGridWidth);// - m_nGridWidth / 2.0;

                uint y_pos = ( nInstrument * m_nGridHeight) + (m_nGridHeight / 2) - 3;

                // draw the "dot"
                p.drawLine(x_pos, y_pos, x_pos + 3, y_pos + 3);         // A
                p.drawLine(x_pos, y_pos, x_pos - 3, y_pos + 3);         // B
                p.drawLine(x_pos, y_pos + 6, x_pos + 3, y_pos + 3);     // C
                p.drawLine(x_pos - 3, y_pos + 3, x_pos, y_pos + 6);     // D

                p.drawLine(x_pos, y_pos + 1, x_pos + 2, y_pos + 3);
                p.drawLine(x_pos, y_pos + 1, x_pos - 2, y_pos + 3);
                p.drawLine(x_pos, y_pos + 5, x_pos + 2, y_pos + 3);
                p.drawLine(x_pos - 2, y_pos + 3, x_pos, y_pos + 5);

                p.drawLine(x_pos, y_pos + 2, x_pos + 1, y_pos + 3);
                p.drawLine(x_pos, y_pos + 2, x_pos - 1, y_pos + 3);
                p.drawLine(x_pos, y_pos + 4, x_pos + 1, y_pos + 3);
                p.drawLine(x_pos - 1, y_pos + 3, x_pos, y_pos + 4);
        }
        else if ( note->get_lenght() == 1 && note->get_noteoff() == true ){
                p.setPen( noteoffColor );
                uint x_pos = 20 + ( pos * m_nGridWidth );// - m_nGridWidth / 2.0;

                uint y_pos = ( nInstrument * m_nGridHeight ) + (m_nGridHeight / 2) - 3;
        
                // draw the "dot"
                p.drawLine(x_pos, y_pos, x_pos + 3, y_pos + 3);         // A
                p.drawLine(x_pos, y_pos, x_pos - 3, y_pos + 3);         // B
                p.drawLine(x_pos, y_pos + 6, x_pos + 3, y_pos + 3);     // C
                p.drawLine(x_pos - 3, y_pos + 3, x_pos, y_pos + 6);     // D

                p.drawLine(x_pos, y_pos + 1, x_pos + 2, y_pos + 3);
                p.drawLine(x_pos, y_pos + 1, x_pos - 2, y_pos + 3);
                p.drawLine(x_pos, y_pos + 5, x_pos + 2, y_pos + 3);
                p.drawLine(x_pos - 2, y_pos + 3, x_pos, y_pos + 5);

                p.drawLine(x_pos, y_pos + 2, x_pos + 1, y_pos + 3);
                p.drawLine(x_pos, y_pos + 2, x_pos - 1, y_pos + 3);
                p.drawLine(x_pos, y_pos + 4, x_pos + 1, y_pos + 3);
                p.drawLine(x_pos - 1, y_pos + 3, x_pos, y_pos + 4);     


        }               
        else {
                float fNotePitch = note->m_noteKey.m_nOctave * 12 + note->m_noteKey.m_key;
                float fStep = pow( 1.0594630943593, ( double )fNotePitch );

                uint x = 20 + (pos * m_nGridWidth);
                int w = m_nGridWidth * note->get_lenght() / fStep;
                w = w - 1;      // lascio un piccolo spazio tra una nota ed un altra

                int y = (int) ( ( nInstrument ) * m_nGridHeight  + (m_nGridHeight / 100.0 * 30.0) );
                int h = (int) (m_nGridHeight - ((m_nGridHeight / 100.0 * 30.0) * 2.0) );

                p.fillRect( x, y + 1, w, h + 1, QColor(100, 100, 200) );        /// \todo: definire questo colore nelle preferenze
                p.drawRect( x, y + 1, w, h + 1 );
        }
}




void DrumPatternEditor::__draw_grid( QPainter& p )
{
        static const UIStyle *pStyle = Preferences::getInstance()->getDefaultUIStyle();
        static const QColor res_1( pStyle->m_patternEditor_line1Color.getRed(), pStyle->m_patternEditor_line1Color.getGreen(), pStyle->m_patternEditor_line1Color.getBlue() );
        static const QColor res_2( pStyle->m_patternEditor_line2Color.getRed(), pStyle->m_patternEditor_line2Color.getGreen(), pStyle->m_patternEditor_line2Color.getBlue() );
        static const QColor res_3( pStyle->m_patternEditor_line3Color.getRed(), pStyle->m_patternEditor_line3Color.getGreen(), pStyle->m_patternEditor_line3Color.getBlue() );
        static const QColor res_4( pStyle->m_patternEditor_line4Color.getRed(), pStyle->m_patternEditor_line4Color.getGreen(), pStyle->m_patternEditor_line4Color.getBlue() );
        static const QColor res_5( pStyle->m_patternEditor_line5Color.getRed(), pStyle->m_patternEditor_line5Color.getGreen(), pStyle->m_patternEditor_line5Color.getBlue() );

        // vertical lines
        p.setPen( QPen( res_1, 0, Qt::DotLine ) );

        int nBase;
        if (m_bUseTriplets) {
                nBase = 3;
        }
        else {
                nBase = 4;
        }

        int n4th = 4 * MAX_NOTES / (nBase * 4);
        int n8th = 4 * MAX_NOTES / (nBase * 8);
        int n16th = 4 * MAX_NOTES / (nBase * 16);
        int n32th = 4 * MAX_NOTES / (nBase * 32);
        int n64th = 4 * MAX_NOTES / (nBase * 64);

        int nNotes = MAX_NOTES;
        if ( m_pPattern ) {
                nNotes = m_pPattern->get_lenght();
        }
        if (!m_bUseTriplets) {
                for ( int i = 0; i < nNotes + 1; i++ ) {
                        uint x = 20 + i * m_nGridWidth;

                        if ( (i % n4th) == 0 ) {
                                if (m_nResolution >= 4) {
                                        p.setPen( QPen( res_1, 0 ) );
                                        p.drawLine(x, 1, x, m_nEditorHeight - 1);
                                }
                        }
                        else if ( (i % n8th) == 0 ) {
                                if (m_nResolution >= 8) {
                                        p.setPen( QPen( res_2, 0 ) );
                                        p.drawLine(x, 1, x, m_nEditorHeight - 1);
                                }
                        }
                        else if ( (i % n16th) == 0 ) {
                                if (m_nResolution >= 16) {
                                        p.setPen( QPen( res_3, 0 ) );
                                        p.drawLine(x, 1, x, m_nEditorHeight - 1);
                                }
                        }
                        else if ( (i % n32th) == 0 ) {
                                if (m_nResolution >= 32) {
                                        p.setPen( QPen( res_4, 0 ) );
                                        p.drawLine(x, 1, x, m_nEditorHeight - 1);
                                }
                        }
                        else if ( (i % n64th) == 0 ) {
                                if (m_nResolution >= 64) {
                                        p.setPen( QPen( res_5, 0 ) );
                                        p.drawLine(x, 1, x, m_nEditorHeight - 1);
                                }
                        }
                }
        }
        else {  // Triplets
                uint nCounter = 0;
                int nSize = 4 * MAX_NOTES / (nBase * m_nResolution);

                for ( int i = 0; i < nNotes + 1; i++ ) {
                        uint x = 20 + i * m_nGridWidth;

                        if ( (i % nSize) == 0) {
                                if ((nCounter % 3) == 0) {
                                        p.setPen( QPen( res_1, 0 ) );
                                }
                                else {
                                        p.setPen( QPen( res_3, 0 ) );
                                }
                                p.drawLine(x, 1, x, m_nEditorHeight - 1);
                                nCounter++;
                        }
                }
        }


        // fill the first half of the rect with a solid color
        static const QColor backgroundColor( pStyle->m_patternEditor_backgroundColor.getRed(), pStyle->m_patternEditor_backgroundColor.getGreen(), pStyle->m_patternEditor_backgroundColor.getBlue() );
        static const QColor selectedRowColor( pStyle->m_patternEditor_selectedRowColor.getRed(), pStyle->m_patternEditor_selectedRowColor.getGreen(), pStyle->m_patternEditor_selectedRowColor.getBlue() );
        int nSelectedInstrument = Hydrogen::get_instance()->getSelectedInstrumentNumber();
        Song *pSong = Hydrogen::get_instance()->getSong();
        int nInstruments = pSong->get_instrument_list()->get_size();
        for ( uint i = 0; i < (uint)nInstruments; i++ ) {
                uint y = m_nGridHeight * i + 1;
                if ( i == (uint)nSelectedInstrument ) {
                        p.fillRect( 0, y, (20 + nNotes * m_nGridWidth), (int)( m_nGridHeight * 0.7 ), selectedRowColor );
                }
                else {
                        p.fillRect( 0, y, (20 + nNotes * m_nGridWidth), (int)( m_nGridHeight * 0.7 ), backgroundColor );
                }
        }

}


void DrumPatternEditor::__create_background( QPainter& p)
{
        static const UIStyle *pStyle = Preferences::getInstance()->getDefaultUIStyle();
        static const QColor backgroundColor( pStyle->m_patternEditor_backgroundColor.getRed(), pStyle->m_patternEditor_backgroundColor.getGreen(), pStyle->m_patternEditor_backgroundColor.getBlue() );
        static const QColor alternateRowColor( pStyle->m_patternEditor_alternateRowColor.getRed(), pStyle->m_patternEditor_alternateRowColor.getGreen(), pStyle->m_patternEditor_alternateRowColor.getBlue() );
        static const QColor lineColor( pStyle->m_patternEditor_lineColor.getRed(), pStyle->m_patternEditor_lineColor.getGreen(), pStyle->m_patternEditor_lineColor.getBlue() );

        int nNotes = MAX_NOTES;
        if ( m_pPattern ) {
                nNotes = m_pPattern->get_lenght();
        }

        Song *pSong = Hydrogen::get_instance()->getSong();
        int nInstruments = pSong->get_instrument_list()->get_size();

        if ( m_nEditorHeight != (int)( m_nGridHeight * nInstruments ) ) {
                // the number of instruments is changed...recreate all
                m_nEditorHeight = m_nGridHeight * nInstruments;
                resize( width(), m_nEditorHeight );
        }

        p.fillRect(0, 0, 20 + nNotes * m_nGridWidth, height(), backgroundColor);
        for ( uint i = 0; i < (uint)nInstruments; i++ ) {
                uint y = m_nGridHeight * i;
                if ( ( i % 2) != 0) {
                        p.fillRect( 0, y, (20 + nNotes * m_nGridWidth), m_nGridHeight, alternateRowColor );
                }
        }

        // horizontal lines
        p.setPen( lineColor );
        for ( uint i = 0; i < (uint)nInstruments; i++ ) {
                uint y = m_nGridHeight * i + m_nGridHeight;
                p.drawLine( 0, y, (20 + nNotes * m_nGridWidth), y);
        }

        p.drawLine( 0, m_nEditorHeight, (20 + nNotes * m_nGridWidth), m_nEditorHeight );
}



void DrumPatternEditor::paintEvent( QPaintEvent* /*ev*/ )
{
        //INFOLOG( "paint" );
        //QWidget::paintEvent(ev);
        
        QPainter painter( this );
        __draw_pattern( painter );
}






void DrumPatternEditor::showEvent ( QShowEvent *ev )
{
        UNUSED( ev );
        updateEditor();
}



void DrumPatternEditor::hideEvent ( QHideEvent *ev )
{
        UNUSED( ev );
}



void DrumPatternEditor::setResolution(uint res, bool bUseTriplets)
{
        this->m_nResolution = res;
        this->m_bUseTriplets = bUseTriplets;

        // redraw all
        update( 0, 0, width(), height() );
        m_pPatternEditorPanel->getVelocityEditor()->updateEditor();
        m_pPatternEditorPanel->getPanEditor()->updateEditor();
        m_pPatternEditorPanel->getLeadLagEditor()->updateEditor();
        m_pPatternEditorPanel->getNoteKeyEditor()->updateEditor();
        /// \todo [DrumPatternEditor::setResolution] aggiornare la risoluzione del Ruler in alto."
}



void DrumPatternEditor::zoom_in()
{
        if (m_nGridWidth >= 3){
                m_nGridWidth *= 2;
        }else
        {
                m_nGridWidth *= 1.5;
        }
        updateEditor();
}



void DrumPatternEditor::zoom_out()
{
        if ( m_nGridWidth > 1.5 ) {
                if (m_nGridWidth > 3){
                        m_nGridWidth /= 2;
                }else
                {
                        m_nGridWidth /= 1.5;
                }
                updateEditor();
        }
}

void DrumPatternEditor::selectedInstrumentChangedEvent()
{
        update( 0, 0, width(), height() );
}


/// This method is called from another thread (audio engine)
void DrumPatternEditor::patternModifiedEvent()
{
        update( 0, 0, width(), height() );
}


void DrumPatternEditor::patternChangedEvent()
{
        updateEditor();
}

void DrumPatternEditor::selectedPatternChangedEvent()
{
        //cout << "selected pattern changed EVENT" << endl;
        updateEditor();
}