Scene

A scene is a frame widget that contains all of the widgets of a window or dialog. It is the root of a widget tree (core.Frame).

The central child of a scene is a body, which contains the main app content. However, the scene also manages optional bars on the sides.

A scene has the paint.Painter that all widgets use to render, and it manages the events for all of its widgets.

A scene “takes place” on a stage, which is where you can customize the options for windows and dialogs, such as sizing and positioning.

Bars

The core.Scene.Bars are functions for configuring optional widgets on any side surrounding the central body content.

The top bar is often used for a toolbar:

b.AddTopBar(func(bar *Frame) {
	NewToolbar(bar).Maker(func(p *tree.Plan) {
        tree.Add(p, func(w *core.Button) {
            w.SetText("Build")
        })
	})
})

The bottom bar is often used in dialogs:

bt := core.NewButton(b).SetText("Dialog")
bt.OnClick(func(e events.Event) {
	d := core.NewBody("Dialog")
	d.AddBottomBar(func(bar *core.Frame) {
		d.AddCancel(bar)
		d.AddOK(bar)
	})
	d.RunDialog(bt)
})