applyPaintTransformForBoxChild method
- @protected
@protected
Utility function for applyPaintTransform for use when the children are RenderBox widgets.
This function turns the value returned by childMainAxisPosition and childCrossAxisPositionfor the child in question into a translation that it then applies to the given matrix.
Calling this for a child that is not visible is not valid.
Implementation
@protected
void applyPaintTransformForBoxChild(RenderBox child, Matrix4 transform) {
final bool rightWayUp = _getRightWayUp(constraints);
double delta = childMainAxisPosition(child);
final double crossAxisDelta = childCrossAxisPosition(child);
assert(constraints.axis != null);
switch (constraints.axis) {
case Axis.horizontal:
if (!rightWayUp)
delta = geometry.paintExtent - child.size.width - delta;
transform.translate(delta, crossAxisDelta);
break;
case Axis.vertical:
if (!rightWayUp)
delta = geometry.paintExtent - child.size.height - delta;
transform.translate(crossAxisDelta, delta);
break;
}
}