[Gise23]

Both the slides and speaker-notes WebViews now have an on_navigation_starting handler. Navigation to URLs served by the deck is allowed, any other URL is opened in the system browser.

Each WebView navigates to about:blank on startup, so that URL is ignored.

Testing

• Tested on macOS in both the slides and speaker-notes windows.
• Confirmed that in presentation mode Podium hides the cursor, so links can't be clicked.
• Not covered on GTK/Linux, as Toga doesn't support on_navigation_starting there.

Clicking an external link in a slide or the speaker notes navigated the window away from the presentation, with no way to get back.

Fixes #36

PR Checklist:

• I will abide by the BeeWare Code of Conduct
• I have read and have followed the CONTRIBUTING.md file
• This PR was generated or assisted using an AI tool

Assisted-by: Claude Opus 5.5

[freakboy3742]

Thanks for the fix! The approach you've taken here looks correct; the only suggestion I'd make would be that is_doc_url should be a method on the Deck, rather than a free-standing method.

[freakboy3742]

As for your question about opening links in the system browser - if you can make that work, it definitely sounds preferable to silently swallowing the click. My only concern would be what happens when the app is in presentation mode... but I guess in presentation mode you don't have a cursor, so this might not be an issue? If you can confirm this isn't a problem in practice, and you can implement the "open in system browser" approach, then go for it!

[Gise23]

As for your question about opening links in the system browser - if you can make that work, it definitely sounds preferable to silently swallowing the click. My only concern would be what happens when the app is in presentation mode... but I guess in presentation mode you don't have a cursor, so this might not be an issue? If you can confirm this isn't a problem in practice, and you can implement the "open in system browser" approach, then go for it!

I confirmed that links can't be clicked in presentation mode, so I've implemented opening external links in the system browser. Each WebView navigates to about:blank on startup, so I excluded that URL.

[freakboy3742]

Awesome - nice work!