public override void paintStack(PaintingContext context, Offset offset)
{
if (this.firstChild == null || this.index == null)
{
return;
}
RenderBox child = this._childAtIndex();
StackParentData childParentData = (StackParentData)child.parentData;
context.paintChild(child, childParentData.offset + offset);
}
protected override bool hitTestChildren(HitTestResult result, Offset position)
{
if (this.firstChild == null || this.index == null)
{
return(false);
}
D.assert(position != null);
RenderBox child = this._childAtIndex();
StackParentData childParentData = (StackParentData)child.parentData;
return(child.hitTest(result, position: position - childParentData.offset));
}
RenderBox _childAtIndex()
{
RenderBox child = firstChild;
int i = 0;
while (child != null && i < index)
{
StackParentData childParentData = (StackParentData)child.parentData;
child = childParentData.nextSibling;
i += 1;
}
D.assert(i == index);
D.assert(child != null);
return(child);
}
protected override bool hitTestChildren(BoxHitTestResult result, Offset position = null)
{
if (firstChild == null)
{
return(false);
}
D.assert(position != null);
RenderBox child = _childAtIndex();
StackParentData childParentData = (StackParentData)child.parentData;
return(result.addWithPaintOffset(
offset: childParentData.offset,
position: position,
hitTest: (BoxHitTestResult resultIn, Offset transformed) => {
D.assert(transformed == position - childParentData.offset);
return child.hitTest(resultIn, position: transformed);
}
));
}