public static MyReadOnlyObservableCollection<InputBinding> GetDefaultInputBindings()
{
if (defaultInputBindings == null)
{
defaultInputBindings = new MyReadOnlyObservableCollection<InputBinding>(new ObservableCollection<InputBinding>(getDefaultInputBindings()));
CheckThatTheDefaultInputBindingCollectionContainsAllCommandsThanNeedToBeBound(defaultInputBindings);
}
return defaultInputBindings;
}
private static void CheckThatTheDefaultInputBindingCollectionContainsAllCommandsThanNeedToBeBound(MyReadOnlyObservableCollection<InputBinding> inputBindings)
{
//gets all commands that are assigned
var assignedCommands = inputBindings.Select(binding => binding.Command).ToList();
//the following commands don't have to be assigned:
var definitelyUnassigned = new ICommand[] { Commands.InsertCharacter, //treated specially: It's associated directly to
//Commands.PlaceCaret,
//Commands.ExtendAndPlaceCaret,
Commands.MoveCaretRightOut, //No such caret movement exist in Word's Equation Editor, but
Commands.MoveCaretLeftOut };//they are useful as template to be copied and modified
//gets the first command that isn't assigned but should be
var unassignedCommand = assignedCommands.Where(command => !command.IsAnyOf(definitelyUnassigned))//definitelyUnassigned has the commands that don't need to be assigned
.FirstOrDefault(not<ICommand>(assignedCommands.Contains)); //get the first that isn't assigned in the result
Contract.Assert(unassignedCommand == null, string.Format("Forgot to assign {0}", unassignedCommand));
}