All files / src/components/music/piano PatternChannelNotes.tsx

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import React from "react";
import { PIANO_ROLL_CELL_SIZE, TOTAL_NOTES } from "consts";
import {
  StyledPianoRollNote,
  StyledPatternChannelNotes,
  StyledPianoRollNoteTouchBlocker,
} from "./style";
import { useAppSelector } from "store/hooks";
 
interface PatternChannelNotesProps {
  patternId: number;
  channelId: number;
  isActive: boolean;
  selectedRowIds?: ReadonlySet<number>;
  isDragging: boolean;
}
 
const ARPEGGIO_CODE = 0;
 
const noteBottom = (note: number) =>
  (note % TOTAL_NOTES) * PIANO_ROLL_CELL_SIZE;
 
export const PatternChannelNotes = React.memo(
  ({
    patternId,
    channelId,
    isActive,
    selectedRowIds,
    isDragging,
  }: PatternChannelNotesProps) => {
    const channelCells = useAppSelector(
      (state) => state.trackerDocument.present.song?.patterns[patternId],
    );
 
    Iif (!channelCells) {
      return null;
    }
 
    let instrument: number | null = null;
 
    return (
      <StyledPatternChannelNotes $active={isActive}>
        {channelCells.map((cell, rowIndex) => {
          Iif (!cell || cell.note === null) {
            return null;
          }
 
          const isSelected =
            isActive && (selectedRowIds?.has(rowIndex) ?? false);
 
          Iif (cell.instrument !== null) {
            instrument = cell.instrument;
          }
 
          const noteInstrument =
            instrument !== null && isActive ? instrument : undefined;
 
          const usingPreviousInstrument =
            cell.instrument === null && instrument !== null;
 
          const left = rowIndex * PIANO_ROLL_CELL_SIZE;
          const effect = cell.effectParam ?? 0;
 
          return (
            <React.Fragment key={`note_${rowIndex}_${channelId}`}>
              <StyledPianoRollNote
                data-type="note"
                data-note={cell.note}
                data-row={rowIndex}
                $instrument={noteInstrument}
                $usingPreviousInstrument={usingPreviousInstrument}
                $isSelected={isSelected}
                $isDragging={isDragging}
                style={{
                  left,
                  bottom: noteBottom(cell.note),
                }}
              >
                {isActive ? (
                  <StyledPianoRollNoteTouchBlocker $isSelected={isSelected} />
                ) : null}
              </StyledPianoRollNote>
 
              {cell.effectCode === ARPEGGIO_CODE ? (
                <>
                  <StyledPianoRollNote
                    data-param={effect >> 4}
                    $instrument={noteInstrument}
                    $usingPreviousInstrument={usingPreviousInstrument}
                    $isVirtual
                    style={{
                      left,
                      bottom: noteBottom(cell.note + (effect >> 4)),
                    }}
                  />
                  <StyledPianoRollNote
                    data-param={effect & 0xf}
                    $instrument={noteInstrument}
                    $usingPreviousInstrument={usingPreviousInstrument}
                    $isVirtual
                    style={{
                      left,
                      bottom: noteBottom(cell.note + (effect & 0xf)),
                    }}
                  />
                </>
              ) : null}
            </React.Fragment>
          );
        })}
      </StyledPatternChannelNotes>
    );
  },
);