private void InsertItem(TKey key, TValue value, int index)
{
if (RaiseListChangedEvents)
{
var args = new ListChgEventArgs <TValue>(this, ListChg.ItemPreAdd, index, value);
OnListChanging(args);
if (args.Cancel)
{
return;
}
// Allow PreAdd to modify 'item' and 'index'
value = args.Item;
index = args.Index;
}
InsertItemCore(key, value, index);
if (RaiseListChangedEvents)
{
OnListChanging(new ListChgEventArgs <TValue>(this, ListChg.ItemAdded, index, value));
OnListChanged(new ListChangedEventArgs(ListChangedType.ItemAdded, index));
OnCollectionChanged(new NotifyCollectionChangedEventArgs(NotifyCollectionChangedAction.Add, value));
}
}
private void ResetItem(TKey key, int index)
{
if (RaiseListChangedEvents)
{
var args = new ListChgEventArgs <TValue>(this, ListChg.ItemPreReset, index, m_dict[key]);
OnListChanging(args);
if (args.Cancel)
{
return;
}
}
if (RaiseListChangedEvents)
{
OnListChanging(new ListChgEventArgs <TValue>(this, ListChg.ItemReset, index, m_dict[key]));
OnListChanged(new ListChangedEventArgs(ListChangedType.ItemChanged, index));
}
}
public void ResetBindings()
{
if (RaiseListChangedEvents)
{
var args = new ListChgEventArgs <TValue>(this, ListChg.PreReset, -1, default(TValue));
OnListChanging(args);
if (args.Cancel)
{
return;
}
}
if (RaiseListChangedEvents)
{
OnListChanging(new ListChgEventArgs <TValue>(this, ListChg.Reset, -1, default(TValue)));
OnListChanged(new ListChangedEventArgs(ListChangedType.Reset, -1));
}
}
private void SetItem(TKey key, TValue value, int index)
{
var old = m_dict[key];
if (RaiseListChangedEvents)
{
var args = new ListChgEventArgs <TValue>(this, ListChg.ItemPreRemove, index, old);
OnListChanging(args);
if (args.Cancel)
{
return;
}
}
if (RaiseListChangedEvents)
{
var args = new ListChgEventArgs <TValue>(this, ListChg.ItemPreAdd, index, value);
OnListChanging(args);
if (args.Cancel)
{
return;
}
}
// Replace the item
SetItemCore(key, value);
if (RaiseListChangedEvents)
{
OnItemChanged(new ItemChgEventArgs <TValue>(index, old, value));
OnListChanged(new ListChangedEventArgs(ListChangedType.ItemChanged, index));
OnCollectionChanged(new NotifyCollectionChangedEventArgs(NotifyCollectionChangedAction.Replace, value, old));
}
if (RaiseListChangedEvents)
{
OnListChanging(new ListChgEventArgs <TValue>(this, ListChg.ItemRemoved, index, old));
}
if (RaiseListChangedEvents)
{
OnListChanging(new ListChgEventArgs <TValue>(this, ListChg.ItemAdded, index, value));
}
}
private void ClearItems()
{
if (RaiseListChangedEvents)
{
var args = new ListChgEventArgs <TValue>(this, ListChg.PreReset, -1, default(TValue));
OnListChanging(args);
if (args.Cancel)
{
return;
}
}
ClearItemsCore();
if (RaiseListChangedEvents)
{
OnListChanging(new ListChgEventArgs <TValue>(this, ListChg.Reset, -1, default(TValue)));
OnListChanged(new ListChangedEventArgs(ListChangedType.Reset, -1));
OnCollectionChanged(new NotifyCollectionChangedEventArgs(NotifyCollectionChangedAction.Reset));
}
}
private void RemoveItem(TKey key, int index)
{
var item = m_dict[key];
if (RaiseListChangedEvents)
{
var args = new ListChgEventArgs <TValue>(this, ListChg.ItemPreRemove, index, item);
OnListChanging(args);
if (args.Cancel)
{
return;
}
}
RemoveItemCore(key, index);
if (RaiseListChangedEvents)
{
OnListChanging(new ListChgEventArgs <TValue>(this, ListChg.ItemRemoved, -1, item));
OnListChanged(new ListChangedEventArgs(ListChangedType.ItemDeleted, index));
OnCollectionChanged(new NotifyCollectionChangedEventArgs(NotifyCollectionChangedAction.Remove, item));
}
}
protected virtual void OnListChanging(ListChgEventArgs <TValue> args)
{
ListChanging?.Invoke(this, args);
}
