package ui import ( "sync/atomic" "github.com/gdamore/tcell" "git.sr.ht/~sircmpwn/aerc/config" ) type UI struct { Content DrawableInteractive exit atomic.Value // bool ctx *Context screen tcell.Screen tcEvents chan tcell.Event invalid int32 // access via atomic } func Initialize(conf *config.AercConfig, content DrawableInteractive) (*UI, error) { screen, err := tcell.NewScreen() if err != nil { return nil, err } if err = screen.Init(); err != nil { return nil, err } screen.Clear() screen.HideCursor() width, height := screen.Size() state := UI{ Content: content, ctx: NewContext(width, height, screen), screen: screen, tcEvents: make(chan tcell.Event, 10), } state.exit.Store(false) go func() { for !state.ShouldExit() { state.tcEvents <- screen.PollEvent() } }() state.invalid = 1 content.OnInvalidate(func(_ Drawable) { atomic.StoreInt32(&state.invalid, 1) }) content.Focus(true) return &state, nil } func (state *UI) ShouldExit() bool { return state.exit.Load().(bool) } func (state *UI) Exit() { state.exit.Store(true) } func (state *UI) Close() { state.screen.Fini() } func (state *UI) Tick() bool { more := false select { case event := <-state.tcEvents: switch event := event.(type) { case *tcell.EventResize: state.screen.Clear() width, height := event.Size() state.ctx = NewContext(width, height, state.screen) state.Content.Invalidate() } state.Content.Event(event) more = true default: } wasInvalid := atomic.SwapInt32(&state.invalid, 0) if wasInvalid != 0 { state.Content.Draw(state.ctx) state.screen.Show() more = true } return more }