Menubar菜单栏

file := tree.ID(page, "file")
bar := components.BeginMenubar(canvas, theme, bounds)
bar.AddTrigger(components.MenubarTrigger{ID: file, Label: "File", Open: open})
bar.AddTrigger(components.MenubarTrigger{ID: tree.ID(page, "view"), Label: "View"})
if open {
    options := components.MenubarOverlayOptions{Layer: 2, DismissID: file}
    content := components.BeginMenubarContent(canvas, theme, popup, options)
    content.AddItem(components.MenubarItem{ID: tree.ID(page, "new"), Label: "New window"})
    content.End()
}
if canvas.Clicked(file) {
    open = !open
}

options := components.MenubarOverlayOptions{
    Layer: 2, DismissID: tree.ID(page, "file"),
}
content := components.BeginMenubarContent(canvas, theme, popup, options)
content.AddItem(components.MenubarItem{
    ID: tree.ID(page, "grid"), Label: "Show grid",
    Kind: components.MenubarCheckbox, Checked: grid,
})
content.AddSeparator()
content.AddItem(components.MenubarItem{
    ID: tree.ID(page, "delete"), Label: "Delete workspace",
    Variant: components.MenubarItemDestructive, Disabled: true,
})
content.End()