After you install the DPS tools from the Folio Builder panel, you can find the Folio Overlays panel under the Window menu. The Folio Overlays panel is essential to adding much of the interactivity to DPS apps. These features are created entirely using the Folio Overlays panel and, usually, a set of external files.
But the panel also adds overlays that provide additional interactive features to DPS apps, including the following: The Folio Overlays panel extends the native features it supports by allowing you to add elements that are unique to tablet apps. On Click and On Rollover events Go To Destination, Go To Next/Previous Page, and Show/Hide Button actions On Release event only Go To First/Last page, Go To URL, Go To Page, Go To Previous/Next State, and Go To State actions only Text anchors and Shared Destination hyperlinks Not supported directly animations must be converted to HTML5 and placed back in the InDesign file The following table shows which native InDesign interactive features are supported and which are not. Most, but not all, of InDesign’s native interactive features are supported by DPS. We’ll discuss each of these in detail later in this section. Other interactive elements are unique to tablet apps, and these elements are added using the Folio Overlays panel. For example, when you have a hyperlink to a website, you need to indicate whether the page will open directly within the tablet app or in the tablet’s browser app. But most of these elements require some additional settings in the Folio Overlays panel, because of characteristics that are unique to tablets. Some of the interactivity that you can add to DPS apps is created using InDesign’s native interactive features ( discussed in Chapter 2), which can be used in PDFs as well as DPS apps. For example, that means that if you are viewing the second slide in a slideshow in one orientation, the same slide is displayed when the user rotates the tablet. As long as the same name is used for objects in each layout, the overlay will be consistent.
One of the nice things about overlays is that they are maintained in both a horizontal and a vertical orientation, with no special action required on your part. Interactive elements are in an overlay that sits on top of the non-interactive elements in your layout.