Linux : Towards window decorations in wayland

[aki237]

I've started dabbling with the zed internals (gpui). I tried enabling the windows window decoration as it didn't have any platform specific controls except for the way the icons (minimize, maximize, close) are rendered. It uses some special reserved Unicode characters which are present in the MS Windows provided Segoe Fluent Icons.

In file crates/ui/src/components/title_bar/windows_window_controls.rs

match self.icon {
  WindowsCaptionButtonIcon::Minimize => "\u{e921}",
  WindowsCaptionButtonIcon::Restore => "\u{e923}",
  WindowsCaptionButtonIcon::Maximize => "\u{e922}",
  WindowsCaptionButtonIcon::Close => "\u{e8bb}",
}

The buttons are displayed as expected. But as I'm missing the font, it was rendering garbage.

I wired up some callbacks for the buttons as follows:

.on_click(move|_, cx| {
  match self.icon {
    WindowsCaptionButtonIcon::Minimize => cx.minimize_window(),
    WindowsCaptionButtonIcon::Restore => cx.zoom_window(),
    WindowsCaptionButtonIcon::Maximize => cx.zoom_window(),
    WindowsCaptionButtonIcon::Close => cx.quit(),
  }
})

Minimize worked
Maximize didn't
Restore didn't
Quit worked.

I've opened a PR to fix the maximized state sync from the toplevel configure event. Which fixes the zoom toggle functionality.

[aki237]

Reference for windows icons: https://learn.microsoft.com/en-us/windows/apps/design/style/segoe-fluent-icons-font#pua-e700-e900