Option to see a previous slide in stack when current slide is displayed

[immadisairaj]

Problem

Let's say I have 3 slides. Currently on 2nd slide. I want to animate the 3rd slide entry where I want to display 2nd slide behind the 3rd slide (as they are already in stack) when animating the entry. This is not happening currently and the background from presentation widget is displayed which doesn't make much sense.

Proposal

Show the previous slide in stack when needed. There are many options.

1. Take input from user through PresentationWidget.
2. Take input from user through SlideWidget a bit difficult as that is an abstract class.
3. provide an extension method for the SlideWidget.

Additional Details

This issue is raised from the comment in #6.

• If considering 3rd option, we can also ask for duration on how long to display previous slide, or have an animated opacity, or many other things. lots of customisation there.