/**
* Pops the top layer.
*/
public void Pop()
{
if (IsEmpty())
{
// there are no layers in the stack
return;
}
InputLayer layerToBeRemoved = Top();
layerToBeRemoved.Deactivate();
layerStack.RemoveAt(layerStack.Count - 1);
EnsureModality();
// QQQ for debugging only
if (!IsEmpty())
{
topLayer = Top();
}
}
private void EnsureModality()
{
bool activateLayer = true;
for (int i = layerStack.Count - 1; i >= 0; --i)
{
// the topmost layer is always activated since we set activateLayer as true
InputLayer layer = layerStack[i];
if (activateLayer)
{
layer.Activate();
}
else
{
layer.Deactivate();
}
// if the current layer is modal, then the succeeding layers are deactivated
if (activateLayer && layer.IsModal)
{
activateLayer = false;
}
}
}