Implement TopLevel.Launcher

[maxkatz6]

What does the pull request do?

Adds TopLevel.Launcher service to allow launching Uri and IStorageItem.

See https://github.com/AvaloniaUI/Avalonia/pull/14320/files#diff-dedbbea0fc7e00cbdde2962c6eb7ba6edc52d0af3894b74608e742000321963a for the public API changes.

How was the solution implemented (if it's not obvious)?

For desktop: simple Process shell execute.
For browser: window.open (only links).
For mobile: copy of essentials launcher with adjustments.

Both macOS and Windows platforms can be improved by using more specific APIs, like WinRT Launcher API on Windows. But I am going to leave it outside of this PR scope.

Checklist

• Added unit tests (if possible)?
• Added XML documentation to any related classes?
• Consider submitting a PR to https://github.com/AvaloniaUI/avalonia-docs with user documentation

Fixed issues

Contributes to #7640
Fixes #13640

[avaloniaui-bot]

You can test this PR using the following package version. 11.1.999-cibuild0043869-beta. (feed url: https://nuget-feed-all.avaloniaui.net/v3/index.json) [PRBUILDID]

[avaloniaui-bot]

You can test this PR using the following package version. 11.1.999-cibuild0043873-beta. (feed url: https://nuget-feed-all.avaloniaui.net/v3/index.json) [PRBUILDID]

[avaloniaui-bot]

You can test this PR using the following package version. 11.1.999-cibuild0043879-beta. (feed url: https://nuget-feed-all.avaloniaui.net/v3/index.json) [PRBUILDID]

[workgroupengineering]

Great.
What do you think to add to "AppBuilder" the ability to override the behavior of ILauncher? May be useful in non-standard Linux distributions.

[maxkatz6]

@workgroupengineering no, probably not now. If anything - we should support OpenURI and OpenFILE - https://github.com/flatpak/xdg-desktop-portal/blob/main/data/org.freedesktop.portal.OpenURI.xml.

[workgroupengineering]

@workgroupengineering no, probably not now. If anything - we should support OpenURI and OpenFILE - https://github.com/flatpak/xdg-desktop-portal/blob/main/data/org.freedesktop.portal.OpenURI.xml.

Ok, thanks I had already seen it. My proposal is a simple way to give those who use custom Linux distributions with DRM or FrameBuffer support the possibility to customize the behavior.

I was thinking of something like this:

          return AppBuilder.Configure<App>()
                      .UsePlatformDetect()
                      .WithInterFont()
                      .WithLaunchUriAsync( async uri=>
                      {
                          ...
                          return await Task.FromResult(false);
                      })

[thevortexcloud]

I can't say I am a fan of that. If it had to be done you would be better off somehow providing a custom implementation of ILauncher. But even that feels unnecessary.

[robloo]

This is great! I'll plan to resurrect the HyperlinkButton control and open a PR in a few weeks.

[jmacato]

LGTM