Viewer events

Apryse SDK allows you to detect and act in response to various events.

Viewer event listener & handler in Xamarin.Android

This tutorial only applies to Xamarin.Android.

PdfViewCtrlTabHostFragment2 events

Event listeners can be added to a PdfViewCtrlTabHostFragment2 to listen for document viewer events. This can be done by adding a TabHostListener using PdfViewCtrlTabHostFragment2.addHostListener(). Some useful events include:

Event	Description
onTabDocumentLoaded	Called when document associated with a tab is loaded.
onTabHostShown	Called when the tab host has been shown.
onTabHostHidden	Called when the tab host has been hidden.
onLastTabClosed	Called when the last tab in the tab host has been closed, and therefore there are no more tabs.
onTabChanged	Called when a new tab has been selected excluding the initial tab.
onNavButtonPressed	Called when navigation button has been pressed.

For a full list of events, please take a look at the TabHostListener API documentation.

PdfViewCtrlTabFragment2 events

Similarly, PdfViewCtrlTabFragment2 has its own events and and you can listen for them by adding a TabListener using PdfViewCtrlTabFragment2.setTabListener(). Some useful events include:

Event	Description
onTabDocumentLoaded	Called when the document has been loaded.
onOpenAddNewTab	Called when a new tab has been opened.
onTabPaused	Called when the tab fragment is paused.
onDownloadedSuccessful	Called when download successfully has been finished.

For a full list of events, please take a look at the TabListener API documentation.

ToolManager events

Touch events, annotation events, quick menu events and tool change events in the document viewer are all managed by the ToolManager. You can learn more about ToolManager events here.