/// <summary>
/// Undoes the most recent command.
/// </summary>
public void Undo()
{
// Undo the command and step up a level
// in the command tree.
tree.Current.Undo();
tree.StepOut();
// Broadcast information about the command state.
CommandsUpdated?.Invoke(!tree.IsAtRoot, true);
}
/// <summary>
/// Redoes a command that was undone.
/// </summary>
public void Redo()
{
// Step down to the next child and re-execute
// its command implementation.
tree.StepIn(0);
tree.Current.Execute();
// Broadcast information about the command state.
CommandsUpdated?.Invoke(true, tree.Children.Count > 0);
}
/// <summary>
/// Executes a command and adds it to the command tree.
/// </summary>
/// <param name="command">The command to add.</param>
public void Do(StageEditorCommand command)
{
// Allows for overwritten commands to clean up
// after themselves.
foreach (StageEditorCommand subCommand in tree.GetAllChildrenBelowLocation())
{
subCommand.Delete();
}
// This explicitly removes branched history on
// the tree. TODO would be interesting to
// explore branched history.
while (tree.Children.Count > 0)
{
tree.RemoveChildBranch(tree.Children[0]);
}
// Execute the command.
command.Execute();
// Add the command to the tree and move down to it.
tree.AddChildren(command);
tree.StepIn(0);
// Broadcast information about the command state.
CommandsUpdated?.Invoke(true, tree.Children.Count > 0);
}