public RevealedOffset getOffsetToReveal(RenderObject target, float alignment,
Rect rect = null
)
{
rect = rect ?? target.paintBounds;
RenderObject child = target;
while (child.parent != this)
{
child = (RenderObject)child.parent;
}
ListWheelParentData parentData = (ListWheelParentData)child.parentData;
float targetOffset = parentData.offset.dy;
Matrix4x4 transform = target.getTransformTo(this).toMatrix4x4();
Rect bounds = MatrixUtils.transformRect(transform, rect);
Rect targetRect = bounds.translate(0.0f, (this.size.height - this.itemExtent) / 2);
return(new RevealedOffset(offset: targetOffset, rect: targetRect));
}
// Calculates where the `caretRect` would be if `_scrollController.offset` is set to `scrollOffset`.
Rect _getCaretRectAtScrollOffset(Rect caretRect, float scrollOffset)
{
float offsetDiff = this._scrollController.offset - scrollOffset;
return(this._isMultiline ? caretRect.translate(0.0f, offsetDiff) : caretRect.translate(offsetDiff, 0.0f));
}
