Checkbox

ui.Checkbox creates a check box toggling a *bool, with a label: a click on the box or its label checks it or unchecks it, as does Space while it has the keyboard focus, and Changed reports a click.

ui.Checkbox(c, &app.settings.Sync, "Sync across devices")
if ui.Checkbox(c, &app.showHidden, "Show hidden files").Changed() {
	app.reload()
}

The check box changes the value itself, the moment the user clicks: read it, or ask Changed for work that follows.

Groups

ui.CheckboxGroup creates a check box over the check boxes built inside it, indented below it, as a list of permissions: it is checked when they all are, mixed when some are, and a click, or Space while it has the focus, checks them all, or none when they all are. Changed reports a click.

ui.CheckboxGroup(c, "Notifications", func() {
	ui.Checkbox(c, &app.mail, "Mail")
	ui.Checkbox(c, &app.calendar, "Calendar")
	ui.Checkbox(c, &app.messages, "Messages")
})

Without a look

ui.CheckboxBase is a check box without a look: a row that toggles its *bool when clicked, which you draw from the value: see custom widgets.

Accessibility

Assistive technology sees a check box named by its label, checked or not, which it toggles as a click does. A check box group is a check box, mixed while some are checked, and a group of the others named by its label.