/// <summary>
/// Get (or create) an UndoRoot for the specified object or document instance.
/// </summary>
/// <param name="root">The object that represents the root of the document or object hierarchy.</param>
/// <returns>An UndoRoot instance for this object.</returns>
public UndoRoot this[object root]
{
get
{
if (null == root)
{
return(null);
}
UndoRoot ret = null;
WeakReference wRef = new WeakReference(root);
if (_Roots.ContainsKey(wRef))
{
ret = _Roots[wRef];
}
if (null == ret)
{
ret = new UndoRoot(root);
_Roots.Add(wRef, ret);
}
return(ret);
}
}
/// <summary>
/// Get (or create) an UndoRoot for the specified object or document instance.
/// </summary>
/// <param name="root">The object that represents the root of the document or object hierarchy.</param>
/// <returns>An UndoRoot instance for this object.</returns>
public UndoRoot this[object root]
{
get
{
if (null == root)
{
return(null);
}
UndoRoot ret = null;
if (_Roots.ContainsKey(root))
{
ret = _Roots[root];
}
if (null == ret)
{
ret = new UndoRoot(root);
_Roots.Add(root, ret);
}
return(ret);
}
}
/// <summary>
/// Starts an undo batch, which is ended when this instance is disposed. Designed for use in a using statement.
/// </summary>
/// <param name="root">The UndoRoot related to this instance.</param>
/// <param name="description">The description of this batch of changes.</param>
/// <param name="consolidateChangesForSameInstance">Should the batch consolidate changes.</param>
public UndoBatch(UndoRoot root, string description, bool consolidateChangesForSameInstance)
{
if (null == root)
{
return;
}
_UndoRoot = root;
root.BeginChangeSetBatch(description, consolidateChangesForSameInstance);
}
/// <summary>
/// Create a ChangeSet for the specified UndoRoot.
/// </summary>
/// <param name="undoRoot">The UndoRoot that this ChangeSet belongs to.</param>
/// <param name="description">A description of the change.</param>
/// <param name="change">The Change instance that can perform the undo / redo as needed.</param>
public ChangeSet(UndoRoot undoRoot, string description, Change change)
{
_UndoRoot = undoRoot;
_Changes = new List <Change>();
_Description = description;
if (null != change)
{
AddChange(change);
}
}
