VisibleSizeChanged
CanvasView::VisibleSizeChanged(float oldWidth, float oldHeight, float newWidth,
ScrollView::VisibleSizeChanged(float /*oldWidth*/, float /*oldHeight*/,
Scrollable::VisibleSizeChanged(float /*oldWidth*/, float /*oldHeight*/,
Scroller::VisibleSizeChanged(float /*oldWidth*/, float /*oldHeight*/,