performLayout method

void performLayout(ChantContext ctxt)

Implementation

void performLayout(ChantContext ctxt) {
  setGlyph(ctxt, GlyphCode.mora);
  horizontalOffset = ctxt.staffInterval / 2 + origin.x;
  var staffPosition = note.staffPosition;

  setStaffPosition(ctxt, staffPosition);

  double verticalOffset = 0;
  // First, we need to find the next note in the neume.
  var noteIndex = note.neume!.notes.indexOf(note);
  Note? nextNote;
  if (noteIndex >= 0) {
    noteIndex++;
    if (note.neume!.notes.length > noteIndex) {
      nextNote = note.neume!.notes[noteIndex];
      if (nextNote.morae.isNotEmpty &&
          note.neume!.notes.length == noteIndex + 1) {
        // this note is the second to last in its neume, and the last note also has a mora
        horizontalOffset += nextNote.bounds.right - note.bounds.right;
      } else if (nextNote.bounds.right > note.bounds.right) {
        // center the dot over the following note.
        horizontalOffset =
            (nextNote.bounds.right - note.bounds.right - bounds.right) / 2;
      } else {
        nextNote = null;
      }
    } else if (note.neume!.notes.length == noteIndex) {
      // this note is the last in its neume:
      if (note.neume!.trailingSpace == TrailingSpace.zero) {
        // if this was the last note in its neume, we only care about the next note if there is no trailing space at the end of this neume.
        var notationIndex = note.neume!.score.notations.indexOf(note.neume!);
        if (notationIndex >= 0) {
          var nextNotation = note.neume!.score.notations.elementAtOrNull(
            notationIndex + 1,
          );
          if (nextNotation is Neume) {
            nextNote = nextNotation.notes.first;
          }
        }
      } else if (note.shape != NoteShape.inclinatum) {
        note.neume!.calculatedTrailingSpace += origin.x;
      }
    }
  }

  if (positionHint == MarkingPositionHint.above) {
    if (staffPosition % 2 == 0) {
      verticalOffset -= ctxt.staffInterval * 1.75;
    } else {
      verticalOffset -= ctxt.staffInterval * 0.75;
    }
  } else if (positionHint == MarkingPositionHint.below) {
    if (staffPosition % 2 == 0) {
      verticalOffset += ctxt.staffInterval * 1.75;
    } else {
      verticalOffset += ctxt.staffInterval * 0.75;
    }
  } else {
    if (staffPosition % 2 == 0) {
      // if the note is in a space and followed by a note on the line below, we often want to move the mora dot up slightly so that it is centered
      // between the top of the note's space and the top of the following note.
      if (nextNote != null && nextNote.staffPosition == staffPosition - 1) {
        verticalOffset -= ctxt.staffInterval * 0.25;
      }
    } else {
      verticalOffset -= ctxt.staffInterval * 0.75;
    }
  }

  bounds = bounds.copyWith(
    x: horizontalOffset + note.bounds.right,
    y: bounds.y + verticalOffset,
  );
}