Answers what clicking them would do without opening anything, for a
caller that has to decide whether to offer the viewer at all — a
"View" button in a sidebar, say. Only files are supported, folders
never match, and a set of nodes matches when one handler takes all
of them.
Whether the viewer can open the given nodes.
Answers what clicking them would do without opening anything, for a caller that has to decide whether to offer the viewer at all — a "View" button in a sidebar, say. Only files are supported, folders never match, and a set of nodes matches when one handler takes all of them.