/// <summary>
/// Handler called every time a string is changed in the controller.
/// </summary>
/// <param name="operation">Details of the operation performed.</param>
private protected virtual void OnTextChanged(WriteableChangeTextOperation operation)
{
IWriteableNodeState State = operation.State;
Debug.Assert(State != null);
Debug.Assert(StateViewTable.ContainsKey(State));
}
private protected virtual void UndoChangeText(IWriteableOperation operation)
{
WriteableChangeTextOperation ChangeTextOperation = (WriteableChangeTextOperation)operation;
ChangeTextOperation = ChangeTextOperation.ToInverseChange();
ExecuteChangeText(ChangeTextOperation);
}
/// <summary>
/// Changes the value of a text.
/// </summary>
/// <param name="nodeIndex">Index of the state with the string to change.</param>
/// <param name="propertyName">Name of the property to change.</param>
/// <param name="text">The new text.</param>
public virtual void ChangeText(IWriteableIndex nodeIndex, string propertyName, string text)
{
Contract.RequireNotNull(nodeIndex, out IWriteableIndex NodeIndex);
Contract.RequireNotNull(text, out string Text);
Debug.Assert(StateTable.ContainsKey(NodeIndex));
System.Action <IWriteableOperation> HandlerRedo = (IWriteableOperation operation) => RedoChangeText(operation);
System.Action <IWriteableOperation> HandlerUndo = (IWriteableOperation operation) => UndoChangeText(operation);
IWriteableNodeState State = (IWriteableNodeState)StateTable[NodeIndex];
WriteableChangeTextOperation Operation = CreateChangeTextOperation(State.Node, propertyName, Text, HandlerRedo, HandlerUndo, isNested: false);
Operation.Redo();
SetLastOperation(Operation);
CheckInvariant();
}
private protected virtual void ExecuteChangeText(WriteableChangeTextOperation operation)
{
Node ParentNode = operation.ParentNode;
string PropertyName = operation.PropertyName;
string NewText = operation.NewText;
IWriteableNodeState State = (IWriteableNodeState)GetState(ParentNode);
Debug.Assert(State != null);
Debug.Assert(State.ValuePropertyTypeTable.ContainsKey(PropertyName));
Debug.Assert(State.ValuePropertyTypeTable[PropertyName] == Constants.ValuePropertyType.String);
string OldText = NodeTreeHelper.GetString(State.Node, PropertyName);
Debug.Assert(OldText != null);
NodeTreeHelper.SetString(State.Node, PropertyName, NewText);
operation.Update(State, OldText);
NotifyTextChanged(operation);
}
private protected virtual void NotifyTextChanged(WriteableChangeTextOperation operation)
{
TextChangedHandler?.Invoke(operation);
}
private protected virtual void RedoChangeText(IWriteableOperation operation)
{
WriteableChangeTextOperation ChangeTextOperation = (WriteableChangeTextOperation)operation;
ExecuteChangeText(ChangeTextOperation);
}