hitTestInput method

@override DisplayObject? hitTestInput(num localX, num localY)

Evaluates this display object to see if the coordinates localX and localY are inside this display object.

If the coordinates are inside, this display object is returned; null otherwise.

localX and localY are relative to to the origin (0,0) of this display object (local coordinates).

Implementation

@override
DisplayObject? hitTestInput(num localX, num localY) {
  localX = localX.toDouble();
  localY = localY.toDouble();

  DisplayObject? hit;

  for (var i = _children.length - 1; i >= 0; i--) {
    final child = _children[i];
    final mask = child.mask;
    final matrix = child.transformationMatrix;

    if (child.visible && child.off == false) {
      final deltaX = localX - matrix.tx;
      final deltaY = localY - matrix.ty;
      var childX = (matrix.d * deltaX - matrix.c * deltaY) / matrix.det;
      var childY = (matrix.a * deltaY - matrix.b * deltaX) / matrix.det;

      if (mask != null) {
        final maskX = mask.relativeToParent ? localX : childX;
        final maskY = mask.relativeToParent ? localY : childY;
        if (mask.hitTest(maskX, maskY) == false) continue;
      }

      if (child is DisplayObjectContainer3D) {
        final point = Point<num>(childX, childY);
        child.projectionMatrix3D.transformPointInverse(point, point);
        childX = point.x.toDouble();
        childY = point.y.toDouble();
      }

      final displayObject = child.hitTestInput(childX, childY);
      if (displayObject == null) continue;

      if (displayObject is InteractiveObject && displayObject.mouseEnabled) {
        return mouseChildren ? displayObject : this;
      }

      hit = this;
    }
  }

  return hit;
}