private static void UpdateHoveredControl(Base control, int x, int y)
{
//
// We use this global variable to represent our hovered control
// That way, if the new hovered control gets deleted in one of the
// Hover callbacks, we won't be left with a hanging pointer.
// This isn't ideal - but it's minimal.
//
m_NewHoveredControl = control;
// Nothing to change..
if (HoveredControl == m_NewHoveredControl)
return;
// We changed - tell the old hovered control that it's no longer hovered.
if (HoveredControl != null && HoveredControl != m_NewHoveredControl)
HoveredControl.DragAndDrop_HoverLeave(CurrentPackage);
// If we're hovering where the control came from, just forget it.
// By changing it to null here we're not going to show any error cursors
// it will just do nothing if you drop it.
if (m_NewHoveredControl == SourceControl)
m_NewHoveredControl = null;
// Check to see if the new potential control can accept this type of package.
// If not, ignore it and show an error cursor.
while (m_NewHoveredControl != null && !m_NewHoveredControl.DragAndDrop_CanAcceptPackage(CurrentPackage))
{
// We can't drop on this control, so lets try to drop
// onto its parent..
m_NewHoveredControl = m_NewHoveredControl.Parent;
// Its parents are dead. We can't drop it here.
// Show the NO WAY cursor.
if (m_NewHoveredControl == null)
{
Platform.Neutral.SetCursor(Cursors.No);
}
}
// Become out new hovered control
HoveredControl = m_NewHoveredControl;
// If we exist, tell us that we've started hovering.
if (HoveredControl != null)
{
HoveredControl.DragAndDrop_HoverEnter(CurrentPackage, x, y);
}
m_NewHoveredControl = null;
}