/// <summary>
/// Attempts to remove all info related to a key from the dictionary.
/// </summary>
/// <param name="key">The key to remove data from.</param>
/// <returns><see langword="true" /> if the removal was successful, <see langword="false" /> otherwise.</returns>
public bool Remove(TKey key)
{
// PRECONDITIONS
// Current object not disposed
this.RequiresNotDisposed();
// ACTION
bool result;
IDictionaryCollectionAdapter <TKey, TValue> container = InternalContainer;
// Within a read/write lock
using (ReadWriteSynchronizationLocker locker = ReadWriteLock())
{
// Find out if there's anything to remove
if (!container.TryGetValue(
key,
out TValue? value))
{
return(false);
}
// Upgrade the locker to a write lock
locker.Upgrade();
// Do the actual removal
result = container.Remove(key);
// Push undo level
if (result)
{
PushUndoLevel(
new DictionaryRemoveStateChange <TKey, TValue>(
key,
value));
}
}
// NOTIFICATION AND RETURN
if (result)
{
BroadcastChange();
}
return(result);
}
/// <summary>
/// Has the last undone operation redone.
/// </summary>
/// <param name="undoRedoLevel">A level of undo, with contents.</param>
/// <param name="toInvokeOutsideLock">An action to invoke outside of the lock.</param>
/// <param name="state">The state object to pass to the invocation.</param>
/// <returns><see langword="true" /> if the redo was successful, <see langword="false" /> otherwise.</returns>
protected override bool RedoInternally(
StateChange undoRedoLevel,
out Action <object> toInvokeOutsideLock,
out object state)
{
if (base.RedoInternally(
undoRedoLevel,
out toInvokeOutsideLock,
out state))
{
return(true);
}
switch (undoRedoLevel)
{
case AddUndoLevel <KeyValuePair <TKey, TValue> > aul:
{
IDictionaryCollectionAdapter <TKey, TValue> container = this.InternalContainer;
container.Add(
aul.AddedItem.Key,
aul.AddedItem.Value);
toInvokeOutsideLock = innerState =>
((ObservableDictionary <TKey, TValue>)innerState).BroadcastChange();
state = this;
break;
}
case RemoveUndoLevel <KeyValuePair <TKey, TValue> > rul:
{
IDictionaryCollectionAdapter <TKey, TValue> container = this.InternalContainer;
container.Remove(rul.RemovedItem.Key);
toInvokeOutsideLock = innerState =>
((ObservableDictionary <TKey, TValue>)innerState).BroadcastChange();
state = this;
break;
}
case ClearUndoLevel <KeyValuePair <TKey, TValue> > _:
{
this.InternalContainer.Clear();
toInvokeOutsideLock = innerState =>
((ObservableDictionary <TKey, TValue>)innerState).BroadcastChange();
state = this;
break;
}
case DictionaryAddUndoLevel <TKey, TValue> daul:
{
IDictionaryCollectionAdapter <TKey, TValue> container = this.InternalContainer;
container.Add(
daul.Key,
daul.Value);
toInvokeOutsideLock = innerState =>
((ObservableDictionary <TKey, TValue>)innerState).BroadcastChange();
state = this;
break;
}
case DictionaryRemoveUndoLevel <TKey, TValue> raul:
{
IDictionaryCollectionAdapter <TKey, TValue> container = this.InternalContainer;
container.Remove(raul.Key);
toInvokeOutsideLock = innerState =>
((ObservableDictionary <TKey, TValue>)innerState).BroadcastChange();
state = this;
break;
}
case DictionaryChangeUndoLevel <TKey, TValue> caul:
{
IDictionaryCollectionAdapter <TKey, TValue> container = this.InternalContainer;
container[caul.Key] = caul.NewValue;
toInvokeOutsideLock = innerState =>
((ObservableDictionary <TKey, TValue>)innerState).BroadcastChange();
state = this;
break;
}
default:
{
toInvokeOutsideLock = null;
state = null;
return(false);
}
}
return(true);
}
/// <summary>
/// Has the last undone operation redone.
/// </summary>
/// <param name="undoRedoLevel">A level of undo, with contents.</param>
/// <param name="toInvokeOutsideLock">An action to invoke outside of the lock.</param>
/// <param name="state">The state object to pass to the invocation.</param>
/// <returns><see langword="true" /> if the redo was successful, <see langword="false" /> otherwise.</returns>
protected override bool RedoInternally(
StateChangeBase undoRedoLevel,
out Action <object?>?toInvokeOutsideLock,
out object?state)
{
if (base.RedoInternally(
undoRedoLevel,
out toInvokeOutsideLock,
out state))
{
return(true);
}
switch (undoRedoLevel)
{
case AddStateChange <KeyValuePair <TKey, TValue> >(var(key, value), _):
{
IDictionaryCollectionAdapter <TKey, TValue> container = InternalContainer;
_ = container.Add(
key,
value);
toInvokeOutsideLock = innerState =>
{
if (innerState == null)
{
return;
}
((ObservableDictionary <TKey, TValue>)innerState).BroadcastChange();
};
state = this;
break;
}
case RemoveStateChange <KeyValuePair <TKey, TValue> >(_, var keyValuePair):
{
IDictionaryCollectionAdapter <TKey, TValue> container = InternalContainer;
_ = container.Remove(keyValuePair.Key);
toInvokeOutsideLock = innerState =>
{
if (innerState == null)
{
return;
}
((ObservableDictionary <TKey, TValue>)innerState).BroadcastChange();
};
state = this;
break;
}
case ClearStateChange <KeyValuePair <TKey, TValue> > :
{
InternalContainer.Clear();
toInvokeOutsideLock = innerState =>
{
if (innerState == null)
{
return;
}
((ObservableDictionary <TKey, TValue>)innerState).BroadcastChange();
};
state = this;
break;
}
case DictionaryAddStateChange <TKey, TValue>(var key, var value):
{
IDictionaryCollectionAdapter <TKey, TValue> container = InternalContainer;
_ = container.Add(
key,
value);
toInvokeOutsideLock = innerState =>
{
if (innerState == null)
{
return;
}
((ObservableDictionary <TKey, TValue>)innerState).BroadcastChange();
};
state = this;
break;
}
case DictionaryRemoveStateChange <TKey, TValue>(var key, _):
{
IDictionaryCollectionAdapter <TKey, TValue> container = InternalContainer;
_ = container.Remove(key);
toInvokeOutsideLock = innerState =>
{
if (innerState == null)
{
return;
}
((ObservableDictionary <TKey, TValue>)innerState).BroadcastChange();
};
state = this;
break;
}
case DictionaryChangeStateChange <TKey, TValue>(var key, var newValue, _):
{
IDictionaryCollectionAdapter <TKey, TValue> container = InternalContainer;
container[key] = newValue;
toInvokeOutsideLock = innerState =>
{
if (innerState == null)
{
return;
}
((ObservableDictionary <TKey, TValue>)innerState).BroadcastChange();
};
state = this;
break;
}
default:
{
toInvokeOutsideLock = null;
state = null;
return(false);
}
}
return(true);
}
