Implemented TrayIcon mouse right button event (#17383)

[loyvsc]

What does the pull request do?

Implements TrayIcon mouse click events (MouseLeftButtonClick, MouseRightButtonClick).

What is the current behavior?

TrayIcon don't have right mouse click event.

What is the updated/expected behavior with this PR?

Now TrayIcon have MouseLeftButtonClick & MouseRightButtonClick events.

Breaking changes

The MouseEventArgs class has been created (stores information about the cursor position when the button is pressed, as well as the button pressed), and the ITrayIconImpl interface has been updated.

Fixed issues

Fixes #17383

[thevortexcloud]

Avalonia generally avoids the concept of a "mouse" and instead prefers "pointer" since Avalonia supports many things that are not a Mouse. Even on desktop platforms touch screens are fairly popular these days.

[MrJul]

Avalonia generally avoids the concept of a "mouse" and instead prefers "pointer" since Avalonia supports many things that are not a Mouse. Even on desktop platforms touch screens are fairly popular these days.

Indeed, this should probably reuse PointerEventArgs.

That said, even with the proper arguments, I fail to really see what this PR really gives us in its current state:

• You didn't add any events to the public TrayIcon, only to the implementations, so there's nothing new usable exposed to the user. (The Impl members shouldn't be used outside of Avalonia, they're marked as Unstable.)
• It really only works for Win32.

The current TrayIcon tries to target the features available in most platforms. We can discuss whether to extend it or not, but APIs that only work on a single platform should probably be kept specific to that platform. Otherwise, that's just an non-fixable bug report waiting to happen.

[loyvsc]

We can discuss whether to extend it or not, but APIs that only work on a single platform should probably be kept specific to that platform

I think this functionality should be implemented, as it may be useful in some situations. I agree that it was a mistake to implement on only one platform - I'll fix it in a couple of days.

You didn't add any events to the public TrayIcon, only to the implementations, so there's nothing new usable exposed to the user. (The Impl members shouldn't be used outside of Avalonia, they're marked as Unstable.)

I accidentally didn't commit edits in the control:)