/// <summary>
/// Sets the value of the component to a different value.
/// </summary>
/// <param name="component">
/// The component with the property value that is to be set.
/// </param>
/// <param name="value">The new value.</param>
public override void SetValue(object component, object value)
{
UndoRedoWrapper owner = component as UndoRedoWrapper;
if (owner == null)
{
parent.SetValue(component, value);
}
else if (!owner.CanRun)
{
throw new InvalidOperationException();
}
else
{
MethodInfo undoRedoSetter = UndoRedoMethodInfo;
if (undoRedoSetter != null)
{
owner.UndoRedoManager.Run(new MethodAction(owner, this, value));
}
else
{
IAction action = owner.CreateAction(this, value);
if (action != null)
{
owner.UndoRedoManager.Run(action);
}
}
}
}
/// <summary>
/// Creates new instance of the T object.
/// </summary>
/// <returns>New T instance.</returns>
protected virtual T OnCreateNew()
{
AddingNewEventHandler eventHandler = AddingNew;
if (eventHandler == null)
{
if (default(T) == null)
{
return(Activator.CreateInstance <T>());
}
else
{
return(default(T));
}
}
AddingNewEventArgs eventArgs = new AddingNewEventArgs();
eventHandler(this, eventArgs);
if (eventArgs.NewObject == null)
{
return(Activator.CreateInstance <T>());
}
UndoRedoWrapper wrapper = eventArgs.NewObject as UndoRedoWrapper;
if (wrapper != null)
{
return((T)wrapper.Instance);
}
return((T)eventArgs.NewObject);
}
object IBindingList.AddNew()
{
UndoRedoWrapper item = CreateItem();
this.Add(item);
return(item);
}
/// <summary>
/// Converts instance of UndoRedoWrapper into instance of T.
/// </summary>
/// <param name="t">Instance of UndoRedoWrapper type.</param>
/// <returns>Instance of T type.</returns>
protected override T Convert(UndoRedoWrapper t)
{
if (t == null)
{
return(default(T));
}
return(((UndoRedoItem)t).Instance);
}
/// <summary>
/// Creates an instance of the ActionEventArgs.
/// </summary>
/// <param name="undoRedoManager">
/// An instance of undo and redo manager that runs an action.
/// </param>
/// <param name="type">Action type.</param>
/// <param name="instance">Instance, which is a subject of the action.</param>
/// <param name="value">Optional action value.</param>
public ActionEventArgs(
UndoRedoManager undoRedoManager,
ActionType type,
UndoRedoWrapper instance,
object value)
{
this.undoRedoManager = undoRedoManager;
this.type = type;
this.instance = instance;
this.value = value;
this.result = true;
}
/// <summary>
/// Tests if two instances are equal.
/// </summary>
/// <param name="obj">Instance to compare with.</param>
/// <returns>true if instances are equal, and false otherwise.</returns>
public override bool Equals(object obj)
{
if (this == obj)
{
return(true);
}
UndoRedoWrapper that = obj as UndoRedoWrapper;
if (that == null)
{
return(false);
}
return(Instance.Equals(that.Instance));
}
/// <summary>
/// Creates an instance of the Action.
/// </summary>
/// <param name="owner">Owner type.</param>
/// <param name="property">Property to change.</param>
/// <param name="value">Value of the property.</param>
public Action(
UndoRedoWrapper owner,
UndoRedoProperty property,
object value)
{
if (owner == null)
{
throw new ArgumentNullException("owner");
}
if (property == null)
{
throw new ArgumentNullException("property");
}
this.owner = owner;
this.property = property;
this.value = value;
}
public MethodAction(UndoRedoWrapper owner, UndoRedoProperty property, object value)
{
this.owner = owner;
this.property = property;
this.value = value;
}
/// <summary>
/// Enables other objects to be notified when this property changes.
/// </summary>
/// <param name="component">The component to remove the handler for.</param>
/// <param name="handler">The delegate to remove as a listener.</param>
public override void RemoveValueChanged(object component, EventHandler handler)
{
UndoRedoWrapper owner = component as UndoRedoWrapper;
parent.RemoveValueChanged(owner != null ? owner.Instance : component, handler);
}
/// <summary>
/// Determines a value indicating whether the value of this property needs
/// to be persisted.
/// </summary>
/// <param name="component">
/// The component with the property to be examined for persistence.
/// </param>
/// <returns>true if the property should be persisted and false otherwise.</returns>
public override bool ShouldSerializeValue(object component)
{
UndoRedoWrapper owner = component as UndoRedoWrapper;
return(parent.ShouldSerializeValue(owner != null ? owner.Instance : component));
}
/// <summary>
/// Gets the current value of the property on a component.
/// </summary>
/// <param name="component">
/// The component with the property for which to retrieve the value.
/// </param>
/// <returns>The value of a property for a given component.</returns>
public override object GetValue(object component)
{
UndoRedoWrapper owner = component as UndoRedoWrapper;
return(parent.GetValue(owner != null ? owner.Instance : component));
}
