/// <summary>
/// Creates the new component undo command.
/// </summary>
/// <param name="obj">Component on which to apply the performed changes.</param>
/// <param name="fieldPath">
/// Optional path that controls which is the field being modified and should receive input focus when the command
/// is executed. Note that the diffs applied have no restriction on how many fields they can modify at once, but
/// only one field will receive focus.</param>
/// <param name="oldToNew">
/// Difference that can be applied to the old object in order to get the new object state.
/// </param>
/// <param name="newToOld">
/// Difference that can be applied to the new object in order to get the old object state.
/// </param>
public RecordComponentUndo(Component obj, string fieldPath, SerializedDiff oldToNew, SerializedDiff newToOld)
{
this.obj = obj;
this.fieldPath = fieldPath;
this.oldToNew = oldToNew;
this.newToOld = newToOld;
}
/// <summary>
/// Generates the diff from the previously recorded state and the current state. If there is a difference
/// an undo command is recorded.
/// </summary>
internal void RecordCommand()
{
if (obj.IsDestroyed)
{
return;
}
SerializedObject newState = SerializedObject.Create(obj);
SerializedDiff oldToNew = SerializedDiff.Create(orgState, newState);
if (oldToNew == null || oldToNew.IsEmpty)
{
return;
}
SerializedDiff newToOld = SerializedDiff.Create(newState, orgState);
UndoRedo.Global.RegisterCommand(new RecordComponentUndo(obj, path, oldToNew, newToOld));
}