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