package ui import ( "sync/atomic" "github.com/gdamore/tcell" "git.sr.ht/~sircmpwn/aerc/config" ) type UI struct { Content DrawableInteractive exit atomic.Value ctx *Context screen tcell.Screen tcEvents chan tcell.Event invalidations chan interface{} } 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), invalidations: make(chan interface{}), } state.exit.Store(false) go (func() { for !state.ShouldExit() { state.tcEvents <- screen.PollEvent() } })() go (func() { state.invalidations <- nil })() content.OnInvalidate(func(_ Drawable) { go (func() { state.invalidations <- nil })() }) 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 { 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) case <-state.invalidations: for { // Flush any other pending invalidations select { case <-state.invalidations: break default: goto done } } done: state.Content.Draw(state.ctx) state.screen.Show() default: return false } return true }