public static bool hitTestBoxChild(this RenderSliver it, HitTestResult result, RenderBox child,
float mainAxisPosition = 0.0f, float crossAxisPosition = 0.0f)
{
bool rightWayUp = _getRightWayUp(it.constraints);
float absolutePosition = mainAxisPosition - it.childMainAxisPosition(child);
float absoluteCrossAxisPosition = crossAxisPosition - it.childCrossAxisPosition(child);
switch (it.constraints.axis)
{
case Axis.horizontal:
if (!rightWayUp)
{
absolutePosition = child.size.width - absolutePosition;
}
return(child.hitTest(result,
position: new Offset(absolutePosition, absoluteCrossAxisPosition)));
case Axis.vertical:
if (!rightWayUp)
{
absolutePosition = child.size.height - absolutePosition;
}
return(child.hitTest(result,
position: new Offset(absoluteCrossAxisPosition, absolutePosition)));
}
return(false);
}
public static void applyPaintTransformForBoxChild(this RenderSliver it, RenderBox child,
Matrix3 transform)
{
bool rightWayUp = _getRightWayUp(it.constraints);
float delta = it.childMainAxisPosition(child);
float crossAxisDelta = it.childCrossAxisPosition(child);
switch (it.constraints.axis)
{
case Axis.horizontal:
if (!rightWayUp)
{
delta = it.geometry.paintExtent - child.size.width - delta;
}
transform.preTranslate(delta, crossAxisDelta);
break;
case Axis.vertical:
if (!rightWayUp)
{
delta = it.geometry.paintExtent - child.size.height - delta;
}
transform.preTranslate(crossAxisDelta, delta);
break;
}
}
public static bool hitTestBoxChild(
this RenderSliver it,
BoxHitTestResult result,
RenderBox child,
float mainAxisPosition = 0.0f,
float crossAxisPosition = 0.0f)
{
bool rightWayUp = _getRightWayUp(it.constraints);
float? delta = it.childMainAxisPosition(child);
float? crossAxisDelta = it.childCrossAxisPosition(child);
float? absolutePosition = mainAxisPosition - delta;
float? absoluteCrossAxisPosition = crossAxisPosition - crossAxisDelta;
Offset paintOffset = null;
Offset transformedPosition = null;
switch (it.constraints.axis)
{
case Axis.horizontal:
if (!rightWayUp)
{
absolutePosition = child.size.width - absolutePosition;
delta = it.geometry.paintExtent - child.size.width - delta;
}
paintOffset = new Offset(delta ?? 0.0f, crossAxisDelta ?? 0.0f);
transformedPosition = new Offset(absolutePosition ?? 0.0f, absoluteCrossAxisPosition ?? 0.0f);
break;
case Axis.vertical:
if (!rightWayUp)
{
absolutePosition = child.size.height - absolutePosition;
delta = it.geometry.paintExtent - child.size.height - delta;
}
paintOffset = new Offset(crossAxisDelta ?? 0.0f, delta ?? 0.0f);
transformedPosition = new Offset(absoluteCrossAxisPosition ?? 0.0f, absolutePosition ?? 0.0f);
break;
}
D.assert(paintOffset != null);
D.assert(transformedPosition != null);
return(result.addWithPaintOffset(
offset: paintOffset,
position: null, // Manually adapting from sliver to box position above.
hitTest: (BoxHitTestResult boxHitTestResult, Offset _) => {
return child.hitTest(boxHitTestResult, position: transformedPosition);
}
));
}