void OnMouseMove(MouseMoveEvent evt)
{
if (!m_Dragging)
{
return;
}
// We don't freeze immediately as it breaks focus when we refresh the list.
if (!m_ListFrozen)
{
m_DragAreaBottom = FreezeScrollView();
m_ListFrozen = true;
}
var newPos = Mathf.Clamp(m_Item.style.top.value.value + evt.mouseDelta.y, m_DragAreaTop, m_DragAreaBottom - m_Item.layout.height);
int index = 0;
float y = 0;
float offset = 0;
m_CurrentIndex = -1;
foreach (ListItem child in m_Children)
{
if (child == m_Item)
{
continue;
}
if (m_CurrentIndex == -1 && newPos < y + child.layout.height * 0.5f)
{
offset += m_Item.layout.height;
m_CurrentIndex = index;
}
if (child.Animator?.to.top != offset)
{
child.Animator?.Stop();
child.Animator?.Recycle();
child.Animator = child.experimental.animation.Start(new StyleValues {
top = offset
}, 500);
child.Animator.KeepAlive();
}
y += child.layout.height;
offset += child.layout.height;
index++;
}
if (m_CurrentIndex == -1)
{
m_CurrentIndex = m_Children.Count - 1;
}
m_Item.style.top = newPos;
m_Item.BringToFront();
evt.StopPropagation();
}