public void Navigate_With_Commands_Update_CanExecute()
{
var items = new List <MySharedItem>();
var source = new ListCollectionViewEx(items);
var commands = new ListCollectionViewCommands(source);
Assert.AreEqual(false, commands.MoveCurrentToFirstCommand.CanExecute(null));
Assert.AreEqual(false, commands.MoveCurrentToPreviousCommand.CanExecute(null));
Assert.AreEqual(false, commands.MoveCurrentToNextCommand.CanExecute(null));
Assert.AreEqual(false, commands.MoveCurrentToLastCommand.CanExecute(null));
var itemA = new MySharedItem();
source.AddNewItem(itemA);
Assert.AreEqual(itemA, source.CurrentItem);
Assert.AreEqual(false, commands.MoveCurrentToFirstCommand.CanExecute(null));
Assert.AreEqual(false, commands.MoveCurrentToPreviousCommand.CanExecute(null));
Assert.AreEqual(false, commands.MoveCurrentToNextCommand.CanExecute(null));
Assert.AreEqual(false, commands.MoveCurrentToLastCommand.CanExecute(null));
var itemB = new MySharedItem();
source.AddNewItem(itemB);
Assert.AreEqual(itemB, source.CurrentItem);
Assert.AreEqual(true, commands.MoveCurrentToFirstCommand.CanExecute(null));
Assert.AreEqual(true, commands.MoveCurrentToPreviousCommand.CanExecute(null));
Assert.AreEqual(false, commands.MoveCurrentToNextCommand.CanExecute(null));
Assert.AreEqual(false, commands.MoveCurrentToLastCommand.CanExecute(null));
commands.MoveCurrentToPreviousCommand.Execute(null); // B => A
Assert.AreEqual(itemA, source.CurrentItem);
Assert.AreEqual(false, commands.MoveCurrentToFirstCommand.CanExecute(null));
Assert.AreEqual(false, commands.MoveCurrentToPreviousCommand.CanExecute(null));
Assert.AreEqual(true, commands.MoveCurrentToNextCommand.CanExecute(null));
Assert.AreEqual(true, commands.MoveCurrentToLastCommand.CanExecute(null));
commands.MoveCurrentToNextCommand.Execute(null); // A => B
Assert.AreEqual(itemB, source.CurrentItem);
Assert.AreEqual(true, commands.MoveCurrentToFirstCommand.CanExecute(null));
Assert.AreEqual(true, commands.MoveCurrentToPreviousCommand.CanExecute(null));
Assert.AreEqual(false, commands.MoveCurrentToNextCommand.CanExecute(null));
Assert.AreEqual(false, commands.MoveCurrentToLastCommand.CanExecute(null));
commands.MoveCurrentToFirstCommand.Execute(null);
Assert.AreEqual(itemA, source.CurrentItem);
Assert.AreEqual(false, commands.MoveCurrentToFirstCommand.CanExecute(null));
Assert.AreEqual(false, commands.MoveCurrentToPreviousCommand.CanExecute(null));
Assert.AreEqual(true, commands.MoveCurrentToNextCommand.CanExecute(null)); // not clear backstack
Assert.AreEqual(true, commands.MoveCurrentToLastCommand.CanExecute(null));
commands.MoveCurrentToLastCommand.Execute(null);
Assert.AreEqual(itemB, source.CurrentItem);
Assert.AreEqual(true, commands.MoveCurrentToFirstCommand.CanExecute(null));
Assert.AreEqual(true, commands.MoveCurrentToPreviousCommand.CanExecute(null));
Assert.AreEqual(false, commands.MoveCurrentToNextCommand.CanExecute(null));
Assert.AreEqual(false, commands.MoveCurrentToLastCommand.CanExecute(null));
}
public void Navigate_With_Commands_Update_CanExecute()
{
var sharedSource = new SharedSource <MySharedItem>();
var commands = new SharedSourceCommands(sharedSource);
Assert.AreEqual(false, commands.MoveToFirstCommand.CanExecute(null));
Assert.AreEqual(false, commands.MoveToPreviousCommand.CanExecute(null));
Assert.AreEqual(false, commands.MoveToNextCommand.CanExecute(null));
Assert.AreEqual(false, commands.MoveToLastCommand.CanExecute(null));
var itemA = new MySharedItem();
sharedSource.Add(itemA);
Assert.AreEqual(true, itemA.IsOnNavigatedToInvoked);
Assert.AreEqual(false, commands.MoveToFirstCommand.CanExecute(null));
Assert.AreEqual(false, commands.MoveToPreviousCommand.CanExecute(null));
Assert.AreEqual(false, commands.MoveToNextCommand.CanExecute(null));
Assert.AreEqual(false, commands.MoveToLastCommand.CanExecute(null));
var itemB = new MySharedItem();
sharedSource.Add(itemB);
Assert.AreEqual(true, itemB.IsOnNavigatedToInvoked);
Assert.AreEqual(true, commands.MoveToFirstCommand.CanExecute(null));
Assert.AreEqual(true, commands.MoveToPreviousCommand.CanExecute(null));
Assert.AreEqual(false, commands.MoveToNextCommand.CanExecute(null));
Assert.AreEqual(false, commands.MoveToLastCommand.CanExecute(null));
commands.MoveToPreviousCommand.Execute(null); // B => A
Assert.AreEqual(itemA, sharedSource.SelectedItem);
Assert.AreEqual(false, commands.MoveToFirstCommand.CanExecute(null));
Assert.AreEqual(false, commands.MoveToPreviousCommand.CanExecute(null));
Assert.AreEqual(true, commands.MoveToNextCommand.CanExecute(null));
Assert.AreEqual(true, commands.MoveToLastCommand.CanExecute(null));
commands.MoveToNextCommand.Execute(null); // A => B
Assert.AreEqual(itemB, sharedSource.SelectedItem);
Assert.AreEqual(true, commands.MoveToFirstCommand.CanExecute(null));
Assert.AreEqual(true, commands.MoveToPreviousCommand.CanExecute(null));
Assert.AreEqual(false, commands.MoveToNextCommand.CanExecute(null));
Assert.AreEqual(false, commands.MoveToLastCommand.CanExecute(null));
commands.MoveToFirstCommand.Execute(null);
Assert.AreEqual(itemA, sharedSource.SelectedItem);
Assert.AreEqual(false, commands.MoveToFirstCommand.CanExecute(null));
Assert.AreEqual(false, commands.MoveToPreviousCommand.CanExecute(null));
Assert.AreEqual(true, commands.MoveToNextCommand.CanExecute(null)); // not clear backstack
Assert.AreEqual(true, commands.MoveToLastCommand.CanExecute(null));
commands.MoveToLastCommand.Execute(null);
Assert.AreEqual(itemB, sharedSource.SelectedItem);
Assert.AreEqual(true, commands.MoveToFirstCommand.CanExecute(null));
Assert.AreEqual(true, commands.MoveToPreviousCommand.CanExecute(null));
Assert.AreEqual(false, commands.MoveToNextCommand.CanExecute(null));
Assert.AreEqual(false, commands.MoveToLastCommand.CanExecute(null));
}
