onScaleStart method

void onScaleStart(
  1. ScaleStartDetails details
)

Implementation

void onScaleStart(ScaleStartDetails details) {
  // 优先处理文本拖动
  final selectedId = _textLayerManager.selectLayerAt(
    details.localFocalPoint,
    _canvasSize ?? Size.zero,
  );
  if (selectedId != null) {
    _dragTextStartPoint = details.localFocalPoint;
    final selectedLayer = _textLayerManager.selectedLayer;
    if (selectedLayer != null) {
      _initialLayerOffset = selectedLayer.position;
    }
    notifyListeners();
    return; // 命中文字，中断后续操作
  }

  if (isCroppingActive) {
    _onCropDragStart(details.localFocalPoint);
  } else {
    _previousScale = _scale;
    // 初始化时，假设不是缩放手势，后续根据 scale 值判断
    _isScalingGesture = false;
  }
}