Cross-platform native UI, in pure Go
One codebase on desktop, web, iOS, Android — even a terminal — and the only app UI you can test headlessly with go test.
Gophics brings the rendering pipeline behind the best cross-platform UIs — immutable widgets, element reconciliation, constraint layout, GPU compositing — to idiomatic Go, and draws every pixel itself, so it looks the same on every screen. No Dart, no JavaScript, no webview, no SDK. Zero CGo.
// Counter is a widget: a plain struct value describing what to show.
type Counter struct{ Start int }
func (Counter) CreateState() widget.State { return &counterState{} }
// counterState holds what changes. StateBase[Counter] gives it SetState and a
// typed W() — the current Counter value, with no cast.
type counterState struct {
widget.StateBase[Counter]
n int
}
func (s *counterState) Init(widget.Ctx) { s.n = s.W().Start }
func (s *counterState) Build(ctx widget.Ctx) widget.Widget {
th := theme.Of(ctx)
return widget.Center(widget.Column(
widget.Text{S: "TAPS", Size: th.Type.Caption, Color: th.Muted},
widget.Sized{H: 4},
widget.Text{
S: fmt.Sprintf("%d", s.n),
Size: th.Type.Display,
Font: theme.FontBold,
Color: th.Text,
},
widget.Sized{H: 18},
theme.Button{
Label: "Increment",
Primary: true,
OnTap: func() { s.SetState(func() { s.n++ }) },
},
))