public void AddWithHistory_Adds_Items_As_Last()
{
var history = new StackHistory();
var target = new ObservableCollection <Item>();
var item0 = new Item("item0");
var item1 = new Item("item1");
var item2 = new Item("item2");
target.AddWithHistory(item0, history);
target.AddWithHistory(item1, history);
target.AddWithHistory(item2, history);
Assert.Equal(3, target.Count);
Assert.Equal(item0, target[0]);
Assert.Equal(item1, target[1]);
Assert.Equal(item2, target[2]);
history.Undo();
Assert.Equal(2, target.Count);
Assert.Equal(item0, target[0]);
Assert.Equal(item1, target[1]);
history.Undo();
Assert.Single(target);
Assert.Equal(item0, target[0]);
history.Undo();
Assert.Empty(target);
history.Redo();
Assert.Single(target);
Assert.Equal(item0, target[0]);
history.Redo();
Assert.Equal(2, target.Count);
Assert.Equal(item0, target[0]);
Assert.Equal(item1, target[1]);
history.Redo();
Assert.Equal(3, target.Count);
Assert.Equal(item0, target[0]);
Assert.Equal(item1, target[1]);
Assert.Equal(item2, target[2]);
}
public void InsertWithHistory_Inserts_Items_List_Middle()
{
var history = new StackHistory();
var target = new ObservableCollection <Item>();
var item0 = new Item("item0");
var item1 = new Item("item1");
var item2 = new Item("item2");
target.InsertWithHistory(0, item0, history);
target.InsertWithHistory(1, item1, history);
target.InsertWithHistory(1, item2, history);
Assert.Equal(3, target.Count);
Assert.Equal(item0, target[0]);
Assert.Equal(item2, target[1]);
Assert.Equal(item1, target[2]);
history.Undo();
Assert.Equal(2, target.Count);
Assert.Equal(item0, target[0]);
Assert.Equal(item1, target[1]);
history.Undo();
Assert.Single(target);
Assert.Equal(item0, target[0]);
history.Undo();
Assert.Empty(target);
history.Redo();
Assert.Single(target);
Assert.Equal(item0, target[0]);
history.Redo();
Assert.Equal(2, target.Count);
Assert.Equal(item0, target[0]);
Assert.Equal(item1, target[1]);
history.Redo();
Assert.Equal(3, target.Count);
Assert.Equal(item0, target[0]);
Assert.Equal(item2, target[1]);
Assert.Equal(item1, target[2]);
}
public void Invoking_Redo_Should_Not_Throw_When_Redos_Are_Empty()
{
var target = new StackHistory();
using (var helper = new HistoryHelper(target))
{
var result = target.Redo();
Assert.False(result);
Assert.Equal(new bool[] { }, helper.CanUndos.ToArray());
Assert.Equal(new bool[] { }, helper.CanRedos.ToArray());
Assert.Equal(new bool[] { }, helper.CanClears.ToArray());
}
}
public void Undo_Sets_IsPaused_True_While_Invoking_Undo_Redo_State()
{
var target = new StackHistory();
target.Snapshot(
undo: () => Assert.True(target.IsPaused),
redo: () => Assert.True(target.IsPaused));
Assert.False(target.IsPaused);
target.Undo();
Assert.False(target.IsPaused);
Assert.False(target.IsPaused);
target.Redo();
Assert.False(target.IsPaused);
}
public void InsertWithHistory_Inserts_Item_Empty_List()
{
var history = new StackHistory();
var target = new ObservableCollection <Item>();
var item0 = new Item("item0");
target.InsertWithHistory(0, item0, history);
Assert.Equal(1, target.Count);
Assert.Equal(item0, target[0]);
history.Undo();
Assert.Equal(0, target.Count);
history.Redo();
Assert.Equal(1, target.Count);
Assert.Equal(item0, target[0]);
}
public void AddWithHistory_Adds_Item_Empty_List()
{
var history = new StackHistory();
var target = new ObservableCollection <Item>();
var item0 = new Item("item0");
target.AddWithHistory(item0, history);
Assert.Single(target);
Assert.Equal(item0, target[0]);
history.Undo();
Assert.Empty(target);
history.Redo();
Assert.Single(target);
Assert.Equal(item0, target[0]);
}
public void RemoveWithHistory_Removes_Index_Empty_List()
{
var history = new StackHistory();
var target = new ObservableCollection <Item>();
var item0 = new Item("item0");
target.Add(item0);
Assert.Equal(1, target.Count);
Assert.Equal(item0, target[0]);
target.RemoveWithHistory(0, history);
Assert.Equal(0, target.Count);
history.Undo();
Assert.Equal(1, target.Count);
Assert.Equal(item0, target[0]);
history.Redo();
Assert.Equal(0, target.Count);
}
public void ReplaceWithHistory_Replaces_Item_Empty_List()
{
var history = new StackHistory();
var target = new ObservableCollection <Item>();
var item0 = new Item("item0");
var item1 = new Item("item1");
target.Add(item0);
Assert.Single(target);
Assert.Equal(item0, target[0]);
target.ReplaceWithHistory(0, item1, history);
Assert.Single(target);
Assert.Equal(item1, target[0]);
history.Undo();
Assert.Single(target);
Assert.Equal(item0, target[0]);
history.Redo();
Assert.Single(target);
Assert.Equal(item1, target[0]);
}
public void ClearWithHistory_Removes_All_Items_Multiple_Item()
{
var history = new StackHistory();
var target = new ObservableCollection <Item>();
var item0 = new Item("item0");
var item1 = new Item("item1");
var item2 = new Item("item2");
target.Add(item0);
target.Add(item1);
target.Add(item2);
Assert.Equal(3, target.Count);
Assert.Equal(item0, target[0]);
Assert.Equal(item1, target[1]);
Assert.Equal(item2, target[2]);
Assert.Equal(0, history.Undos.Count);
Assert.Equal(0, history.Redos.Count);
target.ClearWithHistory(history);
Assert.Equal(0, target.Count);
Assert.Equal(1, history.Undos.Count);
Assert.Equal(0, history.Redos.Count);
history.Undo();
Assert.Equal(3, target.Count);
Assert.Equal(item0, target[0]);
Assert.Equal(item1, target[1]);
Assert.Equal(item2, target[2]);
Assert.Equal(0, history.Undos.Count);
Assert.Equal(1, history.Redos.Count);
history.Redo();
Assert.Equal(0, target.Count);
Assert.Equal(1, history.Undos.Count);
Assert.Equal(0, history.Redos.Count);
}
public LineShapeViewModel(LineShape line, IHistory history)
{
Disposable = new CompositeDisposable();
var lineHistoryScope = new StackHistory().AddTo(this.Disposable);
this.Name = line.ToReactivePropertyAsSynchronized(l => l.Name)
.SetValidateNotifyError(name => string.IsNullOrWhiteSpace(name) ? "Name can not be null or whitespace." : null)
.AddTo(this.Disposable);
var startInitialValue = new PointShapeViewModel(line.Start, lineHistoryScope).AddTo(this.Disposable);
this.Start = new ReactiveProperty <PointShapeViewModel>(startInitialValue)
.SetValidateNotifyError(start => start == null ? "Point can not be null." : null)
.AddTo(this.Disposable);
var endInitialValue = new PointShapeViewModel(line.End, lineHistoryScope).AddTo(this.Disposable);
this.End = new ReactiveProperty <PointShapeViewModel>(endInitialValue)
.SetValidateNotifyError(end => end == null ? "Point can not be null." : null)
.AddTo(this.Disposable);
this.Name.ObserveWithHistory(name => line.Name = name, line.Name, lineHistoryScope).AddTo(this.Disposable);
this.DeleteCommand = new ReactiveCommand();
this.DeleteCommand.Subscribe((x) => Delete(line, history)).AddTo(this.Disposable);
UndoCommand = new ReactiveCommand(lineHistoryScope.CanUndo, false);
UndoCommand.Subscribe(_ => lineHistoryScope.Undo()).AddTo(this.Disposable);
RedoCommand = new ReactiveCommand(lineHistoryScope.CanRedo, false);
RedoCommand.Subscribe(_ => lineHistoryScope.Redo()).AddTo(this.Disposable);
ClearCommand = new ReactiveCommand(lineHistoryScope.CanClear, false);
ClearCommand.Subscribe(_ => lineHistoryScope.Clear()).AddTo(this.Disposable);
}