rfc: Global keyboard shortcuts that respect modal dialog

[mrpmorris]

I am currently using "accesskey" for shortcuts, but this has proven to be a real pain because they are still activated even when there is a modal dialog open, and there is no way to stopPropagation / preventDefault on them even in javascript.

I suggested the following to Vincent on Discord...

<FluentButton Shortcut=@Shortcut.Control.S etc...>Save</FluentButton>
I could also have combinations for alt + control + shift

• ShortCut.Alt.Control.X
• ShortCut.Control.Shift.P
• ShortCut.Alt.Control.Shift.R

You'd wrap your stuff in
<ShortcutHandler>

I could have it so when a new one is created it disables the previous (only the latest in the stack is executed) - Make that optional

<ShortcutHandler Mode=@ShortcutHandlerMode.Additive>

vs modal (default)

<ShortcutHandler Mode=@ShortcutHandlerMode.Exclusive>

This way we could have global shortcut keys for FluentButton, and also give us the opportunity to override/disable them in modal dialog windows. This would avoid using the html accesskey attribute.

He suggested I look at IKeyCodeService. I'd like your input on my suggestion, and if/how it would affect/integrate with this service.

Also, a few questions...

1: I'm wondering why you went with List and ReaderWriterLockSlim rather than ConcurrentList?

fluentui-blazor/src/Core/Components/KeyCode/Services/KeyCodeService.cs

Line 10 in ab5e0eb

private ReaderWriterLockSlim ServiceLock { get; } = new ReaderWriterLockSlim();

In the following screenshot

2: Which key on Windows is the final meta icon?
3: What is Location, and what other possibilities are there?