New Control: <TrayIcon/> for easier tray icon management on WinUI apps

[0x5bfa]

WinUI currently has no built-in tray icon API.

Developers must use raw Win32 (Shell_NotifyIcon), hidden windows, and message hooks just to add a tray icon.

A simple <TrayIcon /> control would make tray icon management much easier and fit naturally into desktop WinUI apps.

Example:

<TrayIcon
    IconSource="Assets/Icon.ico"
    IsVisible="{x:Bind ViewModel.IsTrayIconVisible, Mode=OneWay}"
    Tooltip="My app is minimized here, double click to open window.">

    <!--  For right click  -->
    <TrayIcon.ContextFlyout>
        <MenuFlyout>
            <MenuFlyoutItem Text="Open" />
            <MenuFlyoutItem Text="Exit" />
        </MenuFlyout>
    </TrayIcon.ContextFlyout>

    <!--  For left click  -->
    <TrayIcon.Content>
        <Grid>
            <!--  Content -->
        </Grid>
    </TrayIcon.Content>

</TrayIcon>

Events

It supports basically these interaction categories:

• Left click (WM_LBUTTONDOWN & WM_LBUTTONUP)
• Right click (WM_RBUTTONDOWN & WM_RBUTTONUP)
• Middle click (WM_MBUTTONDOWN & WM_MBUTTONUP)
• Double click (WM_LBUTTONDBLCLK / WM_RBUTTONDBLCLK / WM_MBUTTONDBLCLK)
• Mouse move / hover (WM_MOUSEMOVE)
• Context menu requests (WM_CONTEXTMENU)
• Keyboard activation (NIN_SELECT / NIN_KEYSELECT)
• Balloon notification interactions (NIN_BALLOONSHOW / NIN_BALLOONHIDE / NIN_BALLOONTIMEOUT/ NIN_BALLOONUSERCLICK)
• Rich popup hover interactions (NIN_POPUPOPEN / NIN_POPUPCLOSE)

[0x5bfa]

If someone can elevate this to the WinUI team, I'm willing to open the same request in the WinUI repo.
CC @Arlodotexe @michael-hawker

Here's our code:
https://github.com/files-community/Files/blob/main/src/Files.App/Utils/Taskbar/SystemTrayIcon.cs

If you are able to, you can try reach out the Your Phone team since it has the tray icon experience while it's a WinUI app.