Windows with native UI

A window with Content takes the window options of any window, such as its size, StateKey, Frameless and Parent, as well as menus, dialogs and the other desktop APIs. It has no page: Page() is nil, and it ignores URL and WindowOptions.Page. Its Go code needs no bindings: the view calls it directly. CapturePage returns a PNG of what it shows.

mygo.NewWindow(mygo.WindowOptions{
	Title:    "Notes",
	Width:    900,
	Height:   600,
	StateKey: "main",
	Content:  ui.View(app.view),
})

Title bars

With TitleBarStyle: mygo.TitleBarHidden, the view draws the title bar under the window controls, as a page does with the --mygo-titlebar-* CSS variables: c.TitleBar() returns the room the controls take, zero in full screen, and DragWindow makes elements drag the window, which double-clicking them zooms or minimizes as a title bar would:

bar := c.TitleBar()
ui.Row(c).Height(max(bar.Height, 32)).Padding(0, bar.Right+12, 0, bar.Left+12).DragWindow().Children(func() {
	ui.Text(c, "Inbox").Bold()
})

In a Frameless window, DragWindow makes an element move the window, and a double click on it maximizes the window.

Vibrancy

On macOS, a window's Vibrancy shows wherever its native UI draws no background. The root draws the theme's by default: make it transparent and give backgrounds to the parts that need one, as a sidebar beside opaque content does:

c.Root().Background(ui.Transparent)
ui.Row(c).Fill().AlignItems(ui.Stretch).Children(func() {
	app.sidebar(c) // over the material
	ui.Column(c).Grow(1).Background(c.Theme().Background).Children(func() { app.content(c) })
})

No webview

An app whose windows all show native UI needs no webview: on Linux it needs GTK 3 alone, not WebKitGTK, and on Windows no WebView2 Runtime.