updateRenderObject method

@override void updateRenderObject(BuildContext context, covariant RenderLayoutBox renderObject)

Updates the render object when widget properties change.

This method efficiently updates only the properties that have changed, minimizing unnecessary layout or paint operations. It tracks whether a full layout or just a repaint is needed based on which properties changed.

Implementation

@override
void updateRenderObject(
  BuildContext context,
  covariant RenderLayoutBox renderObject,
) {
  bool needsPaint = false;
  bool needsLayout = false;
  if (renderObject.layoutTextDirection != textDirection) {
    renderObject.layoutTextDirection = textDirection;
    needsLayout = true;
  }
  if (renderObject.reversePaint != reversePaint) {
    renderObject.reversePaint = reversePaint;
    needsPaint = true;
  }
  if (renderObject.mainScrollDirection != mainScrollDirection) {
    renderObject.mainScrollDirection = mainScrollDirection;
    needsLayout = true;
  }
  if (renderObject.horizontal != horizontal) {
    renderObject.updateHorizontalOffset(horizontal);
    needsLayout = true;
  }
  if (renderObject.vertical != vertical) {
    renderObject.updateVerticalOffset(vertical);
    needsLayout = true;
  }
  if (renderObject.horizontalAxisDirection != horizontalAxisDirection) {
    renderObject.horizontalAxisDirection = horizontalAxisDirection;
    needsLayout = true;
  }
  if (renderObject.verticalAxisDirection != verticalAxisDirection) {
    renderObject.verticalAxisDirection = verticalAxisDirection;
    needsLayout = true;
  }
  if (renderObject.boxLayout != layout) {
    renderObject.boxLayout = layout;
    needsLayout = true;
  }
  if (renderObject.horizontalOverflow != horizontalOverflow) {
    renderObject.horizontalOverflow = horizontalOverflow;
    needsPaint = true;
  }
  if (renderObject.verticalOverflow != verticalOverflow) {
    renderObject.verticalOverflow = verticalOverflow;
    needsPaint = true;
  }
  if (renderObject.layoutTextBaseline != textBaseline) {
    renderObject.layoutTextBaseline = textBaseline;
    needsLayout = true;
  }
  if (renderObject.borderRadius != borderRadius) {
    renderObject.borderRadius = borderRadius;
    needsPaint = true;
  }
  if (renderObject.clipBehavior != clipBehavior) {
    renderObject.clipBehavior = clipBehavior;
    needsPaint = true;
  }
  if (needsLayout) {
    renderObject.markNeedsLayout();
  } else if (needsPaint) {
    renderObject.markNeedsPaint();
  }
}