private void OnResourceDeleting(object sender, ResourceIndexEventArgs e)
{
if (_resList == null || e.Index < 0)
{
return;
}
lock ( _events )
{
ResourceListEvent ev = new ResourceListEvent(_resList, EventType.Remove, e.Resource.Id, e.Index);
_events.Add(ev);
_needMerge = true;
}
}
public ResourceListEvent GetNextEvent()
{
if (_processingLevel == 0)
{
throw new InvalidOperationException("You need to call BeginProcessEvents() before calling GetNextEvent()");
}
while (_events.Count > 0)
{
ResourceListEvent ev = (ResourceListEvent)_events [0];
_events.RemoveAt(0);
if (ev.ResourceList == _resList)
{
return(ev);
}
}
return(null);
}
private void OnResourceChanged(object sender, ResourcePropIndexEventArgs e)
{
IResourceList resList = _resList;
if (resList == null || e.Index < 0)
{
return;
}
lock ( resList )
{
lock ( _events )
{
if (_resList == null)
{
return;
}
ResourceListEvent ev = new ResourceListEvent(_resList, EventType.Change, e.Resource.Id, e.Index, e.ChangeSet);
_events.Add(ev);
_needMerge = true;
}
}
}
private void DoMergeEvents()
{
if (!_mergeEvents)
{
return;
}
// C0 A1 A2 A3 R1
for (int i = _events.Count - 1; i >= 0; i--)
{
// i
// C0 A1 A2 A3 R1
ResourceListEvent ev = (ResourceListEvent)_events [i];
if (ev.ResourceList != _resList)
{
_events.RemoveAt(i);
continue;
}
if (ev.EventType == EventType.Remove)
{
bool discardRemove = false;
// Remove eats all previous events with the same resource, up to and including the Add
// j i
// C0 A1 A2 A3 R1
for (int j = i - 1; j >= 0; j--)
{
ResourceListEvent ev2 = (ResourceListEvent)_events [j];
if (ev2.ResourceID == ev.ResourceID)
{
// j i
// C0 A1 A2 A3 R1
_events.RemoveAt(j);
// j i
// C0 A2 A3 R1
i--;
// j i
// C0 A2 A3 R1
if (ev2.EventType == EventType.Add)
{
// adjust the index of events following the removed Add
discardRemove = true;
// jk i
// C0 A2 A3 R1
int maxAdjustIndex = ev2.Index;
for (int k = j; k <= i; k++)
{
ResourceListEvent ev3 = (ResourceListEvent)_events [k];
if (ev3.EventType == EventType.Remove && ev3.Index < maxAdjustIndex)
{
maxAdjustIndex--;
if (maxAdjustIndex < 0)
{
throw new ApplicationException("ResourceList event queue internal error: negative maxAdjustIndex");
}
}
else if (ev3.Index > maxAdjustIndex)
{
if (ev3.Index <= 0)
{
throw new ApplicationException("ResourceList event queue internal error: negative index on" + ev.ToString());
}
ev3.SetIndex(ev3.Index - 1);
}
}
// j ik
// C0 A1 A2 R1
break;
}
}
}
if (discardRemove)
{
Debug.Assert(_events [i] == ev);
_events.RemoveAt(i);
continue;
}
// j ik
// C0 A1 A2
}
else if (ev.EventType == EventType.Change)
{
bool discardChange = false;
for (int j = i - 1; j >= 0; j--)
{
ResourceListEvent ev2 = (ResourceListEvent)_events [j];
if (ev2.ResourceID == ev.ResourceID)
{
if (ev2.EventType == EventType.Change)
{
ev2.SetChangeSet(ev.ChangeSet.Merge(ev2.ChangeSet));
}
discardChange = true;
break;
}
}
if (discardChange)
{
Debug.Assert(_events [i] == ev);
_events.RemoveAt(i);
continue;
}
}
if (ev.EventType != EventType.Remove)
{
int index = _resList.IndexOf(ev.ResourceID);
if (index < 0)
{
throw new InvalidOperationException("ResourceListEventQueue internal error: resource " +
ev.ResourceID + " not found in list (event" + ev.ToString() + ")");
}
ev.SetListIndex(index);
}
}
_needMerge = false;
}
