/// <summary>
/// Merges multiple animated slides into a single slide.
/// TODO: Test this method more thoroughly, in places other than autozoom.
/// </summary>
public static void SquashSlides(IEnumerable <PowerPointSlide> slides)
{
PowerPointSlide firstSlide = null;
ShapeRange previousShapes = null;
EffectTransition slideTransition = new EffectTransition();
foreach (PowerPointSlide slide in slides)
{
if (firstSlide == null)
{
firstSlide = slide;
slideTransition = GetTransitionFromSlide(slide);
firstSlide.Transition.AdvanceOnClick = MsoTriState.msoTrue;
firstSlide.Transition.AdvanceOnTime = MsoTriState.msoFalse;
previousShapes = ShapeUtil.GetShapesWhenTypeNotMatches(firstSlide, firstSlide.Shapes.Range(), MsoShapeType.msoPlaceholder);
continue;
}
Sequence effectSequence = firstSlide.GetNativeSlide().TimeLine.MainSequence;
int effectStartIndex = effectSequence.Count + 1;
slide.DeleteIndicator();
ShapeRange newShapeRange = firstSlide.CopyShapesToSlide(slide.Shapes.Range());
newShapeRange.ZOrder(MsoZOrderCmd.msoSendToBack);
foreach (Shape shape in newShapeRange)
{
AddAppearAnimation(shape, firstSlide, effectStartIndex);
}
foreach (Shape shape in previousShapes)
{
AddDisappearAnimation(shape, firstSlide, effectStartIndex);
}
slideTransition.ApplyTransition(effectSequence[effectStartIndex]);
previousShapes = newShapeRange;
slideTransition = GetTransitionFromSlide(slide);
slide.Delete();
}
}