public void ShouldCorrectlyUndo()
{
var history = new History();
var element = new Ball() { X = 0, Y = 0 };
var change = new TranslationChange(element, 5, 5);
history.AddAndDo(change);
history.Undo();
Assert.IsFalse(history.CanUndo());
Assert.IsTrue(history.CanRedo());
Assert.AreEqual(0, element.X, 0.1);
Assert.AreEqual(0, element.Y, 0.1);
}
protected override void OnMouseUp(object sender, MouseEventArgs e)
{
if (State == SelectionState.Dragging && posChange != null)
{
Editor.History.Add(posChange);
posChange = null;
}
if (State == SelectionState.Shaping && currentPoint != shapeData.startPoint)
{
var translation = new TranslationChange(SelectedElement, SelectedElement.Location - shapeData.initialPoint);
var scale = new PropertyChange(SelectedElement, "Scale", SelectedElement.Scale, shapeData.initialScale);
var rotation = new PropertyChange(SelectedElement, "BaseRotation", SelectedElement.BaseRotation, shapeData.initialRotation);
Editor.History.Add(new CompoundChange(new IChange[] { translation, scale, rotation }));
}
State = SelectionState.Idle;
Editor.Invalidate();
}
protected override void OnMouseMove(object sender, MouseEventArgs e)
{
if (SelectedElement == null) State = SelectionState.Idle;
if (State == SelectionState.Dragging)
{
var pos = e.GetPosition(Editor);
var newPos = Editor.PointToPinball(new Vector(pos.X, pos.Y) - delta);
SelectedElement.Location = newPos;
posChange = new TranslationChange(SelectedElement, newPos - startVector);
Editor.Invalidate();
}
else if (State == SelectionState.Shaping)
{
var pos = e.GetPosition(Editor);
currentPoint = new Point(pos.X, pos.Y);
SelectedElement.Scale = ((currentPoint - shapeData.origin).Length / (shapeData.startPoint - shapeData.origin).Length) * shapeData.initialScale;
var newLoc = Editor.PointToPinball(shapeData.origin) - SelectedElement.GetRotationOrigin();
SelectedElement.Location = new Vector(newLoc.X, newLoc.Y);
SelectedElement.BaseRotation = shapeData.initialRotation + Vector.AngleBetween(shapeData.startPoint - shapeData.origin, currentPoint - shapeData.origin);
Editor.Invalidate();
}
}
public void ShouldRaiseEvents()
{
var eventsRaised = 0;
var history = new History();
var element = new Ball() { X = 0, Y = 0 };
var change = new TranslationChange(element, 5, 5);
// Bind closure expression
history.Change += () =>
{
eventsRaised++;
};
// Act
history.AddAndDo(change);
history.Undo();
history.Redo();
Assert.AreEqual(3, eventsRaised);
}
