resizeSelectedFromHandle method

bool resizeSelectedFromHandle(CanvasSelectionHandle handle, double dx, double dy)

Resizes the selected object from a visible selection handle.

Implementation

bool resizeSelectedFromHandle(
  CanvasSelectionHandle handle,
  double dx,
  double dy,
) {
  if (_selectedObjectIds.isEmpty) return false;
  if (_selectedObjectIds.length == 1) {
    final id = selectedObjectId;
    final object = selectedObject;
    if (id == null || object == null) return false;
    if (object.locked) return false;
    _remember();
    final resized = _constrainObject(
      object,
      _resizeObjectFromHandle(
        object,
        handle,
        dx,
        dy,
        constraints: constraints,
      ),
    );
    final index = _objects.indexWhere((item) => item.id == id);
    if (index < 0) return false;
    _objects[index] = resized;
    render();
    onResize?.call(List.unmodifiable([resized]));
    _emitChange();
    return true;
  }

  final bounds = selectedBounds;
  if (bounds == null) return false;
  final nextBounds = _boundsFromHandle(bounds, handle, dx, dy);
  final scaleX = bounds.width == 0 ? 1.0 : nextBounds.width / bounds.width;
  final scaleY = bounds.height == 0 ? 1.0 : nextBounds.height / bounds.height;
  _remember();
  final changed = <CanvasObject>[];
  for (final id in _selectedObjectIds) {
    final index = _objects.indexWhere((object) => object.id == id);
    if (index < 0) continue;
    if (_objects[index].locked) continue;
    final resized = _constrainObject(
      _objects[index],
      _scaleObjectInBounds(
        _objects[index],
        bounds,
        nextBounds,
        scaleX,
        scaleY,
        constraints: constraints,
      ),
    );
    _objects[index] = resized;
    changed.add(resized);
  }
  if (changed.isEmpty) return false;
  render();
  onResize?.call(List.unmodifiable(changed));
  _emitChange();
  return true;
}