copyFrom method

void copyFrom(BufferLine src, int srcCol, int dstCol, int len,)

Copies len cells from src starting at srcCol to dstCol at this line.

Implementation

void copyFrom(BufferLine src, int srcCol, int dstCol, int len) {
  final requiredLength = dstCol + len;
  if (requiredLength > _length) {
    resize(requiredLength);
  }
  final copiedCombiningCharacters = <int, String>{};
  final copiedUnderlineColors = <int, int>{};
  for (final entry in src._combiningCharacters.entries) {
    if (entry.key < srcCol || entry.key >= srcCol + len) continue;
    copiedCombiningCharacters[dstCol + entry.key - srcCol] = entry.value;
  }
  for (final entry in src._underlineColors.entries) {
    if (entry.key < srcCol || entry.key >= srcCol + len) continue;
    copiedUnderlineColors[dstCol + entry.key - srcCol] = entry.value;
  }

  // data.setRange(
  //   dstCol * _cellSize,
  //   (dstCol + len) * _cellSize,
  //   Uint32List.sublistView(src.data, srcCol * _cellSize, len * _cellSize),
  // );

  var srcOffset = srcCol * _cellSize;
  var dstOffset = dstCol * _cellSize;

  for (var i = 0; i < len * _cellSize; i++) {
    _data[dstOffset++] = src._data[srcOffset++];
  }

  _combiningCharacters.removeWhere(
    (index, _) => index >= dstCol && index < dstCol + len,
  );
  _combiningCharacters.addAll(copiedCombiningCharacters);
  _underlineColors.removeWhere(
    (index, _) => index >= dstCol && index < dstCol + len,
  );
  _underlineColors.addAll(copiedUnderlineColors);
}