The navigation in ToDoSo will occur on three different levels:
- The folder level allows the user to view all the presentations that he/she has created in the application. Although there are no folders in ToDoSo, this term is used in analogy with the file system explorer that is to be found on the desktop.
- The presentation level allows the user to navigate within a presentation, through the slides that it is composed of.
- The slide level is the one at which the player and the editor of the presentation operate: the slide is displayed in full-screen.
Those levels are detailed in a different order to clarify the rational behind their design.
In current presentation software, navigating in a set of slides generally requires to scroll through the thumbnail view. In desktop applications, additional ways of navigation might be provided but they are neither the default choice nor obvious alternatives.
This way of navigation is obviously convenient to navigate to the previous and next slides, however, this could also be achieved by providing two buttons labelled as “previous” and “next”. What is the real value of the thumbnails for those two slides when they could be accessed in full screen by a simple click? The visual consistency of the presentation should be guaranteed by the “theme” and “layout” features of the application, it does not require for the user to remember (or see) how the other slides look like. Likewise, the thumbnail is generally too small to have a readable content. A slide has to be in the main view for its content to be readable.
The usefulness of the thumbnail view resides in the possibility for the user to quickly search for a particular slide, which is likely to be easily identified visually. It requires, that the user points at the thumbnail view with its mouse, then scroll until he/she finds the slide and finally click on it. If it is a long presentation, this can be a rather long process with those slides stacked on top of the others in a single dimension.
The solution that will be explored in ToDoSo is to remove the thumbnail view from the interface and to create a zoomable bi-dimensional map of the slides.
When a presentation is opened, this map is displayed to the user who can simply double-click on a slide or point at it ans use the mouse’s wheel to zoom in. Once a slide is zoomed in, controls appear to let the user access directly the next and previous slides, and to zoom out to search for a particular slide in the map.
This way of navigation can be compared to the one used in Google Maps and which is generaly referred to as Zooming interface (Cockburn et al., 2008) or Zooming Interface Paradigm (ZIP) (Raskin, 2000).
It would be tempting to apply the Zooming Interface concept to the folder level to provide a coherent way of navigation throughout the application. However, this would require to display all the slides of all presentations at this level which in turn requires to have very tiny thumbnails to be able to fit multiple presentations on the same view. Instead, it has been decided to present only the first slide of a presentation at this level.
A visual clue should be provided to differentiate this level from the presentation level in addition to the different menus and toolbars, such as a a different background colour.
To switch to the presentation level, the user would simply double click on a presentation to reveal its full content while other presentations are hidden.
Slide level – the player
The player is designed to let the user access to the next and previous slides as well as playing the possible animations of the slide and switch back to the presentation level.
In this mockup of the player, the buttons have been given the look of keys. This emphasise the possibility to use the keyboard as an alternative to control the display of the presentation. Indeed, when the presentation is played during a lecture, the buttons should be hidden and a keyboard or a remote control could be used instead of the mouse. Those buttons actually fade out when the pointer of the mouse is moved away from the slides.
The button with the bigger arrow corresponds to the “play” button: the main control that either triggers an animation or the display of the following slide if all the animations have been played.
Slide level – the editor
This part requires further research before a valuable design could be produced.