ok how do i program a UI though

internal/app/menu_list.go

@@ -0,0 +1,45 @@
+package app
+
+import (
+	"github.com/gdamore/tcell/v2"
+	"github.com/jordanorelli/astro-domu/internal/math"
+	"github.com/jordanorelli/blammo"
+)
+
+type menuList struct {
+	*blammo.Log
+	choices  []string
+	selected int
+}
+
+func (m *menuList) handleEvent(ui *UI, e tcell.Event) bool {
+	switch t := e.(type) {
+	case *tcell.EventKey:
+		key := t.Key()
+		switch key {
+		case tcell.KeyDown:
+			m.selected = (m.selected + 1) % len(m.choices)
+		case tcell.KeyUp:
+			if m.selected == 0 {
+				m.selected = len(m.choices) - 1
+			} else {
+				m.selected--
+			}
+		}
+	default:
+		// ui.Debug("screen saw unhandled event of type %T", e)
+	}
+	return true
+}
+
+func (m *menuList) draw(b *buffer) {
+	for i, choice := range m.choices {
+		if i == m.selected {
+			b.writeString("▷ "+choice, math.Vec{0, i}, tcell.StyleDefault)
+		} else {
+			b.writeString("  "+choice, math.Vec{0, i}, tcell.StyleDefault)
+		}
+	}
+}
+
+func (m *menuList) setFocus(bool) {}

internal/app/ui.go

@@ -20,6 +20,7 @@ type UI struct {
 
 	statusBar *statusBar
 	gameView  *gameView
+	testList  *menuList
 	chatView  *chatView
 	focussed  view
 }
@@ -63,6 +64,10 @@ func (ui *UI) Run() {
 		history: make([]sim.ChatMessage, 0, 32),
 	}
 	ui.statusBar = &statusBar{}
+	ui.testList = &menuList{
+		Log:     ui.Child("menu-list"),
+		choices: []string{"apple", "banana", "orange"},
+	}
 	ui.focussed = ui.gameView
 
 	ui.Info("running ui")
@@ -217,9 +222,12 @@ func (ui *UI) handleUserInput() bool {
 			if key == tcell.KeyTab {
 				ui.Info("saw tab from keyboard input, switching focussed view")
 				ui.focussed.setFocus(false)
-				if ui.focussed == ui.gameView {
+				switch ui.focussed {
+				case ui.gameView:
 					ui.focussed = ui.chatView
-				} else {
+				case ui.chatView:
+					ui.focussed = ui.testList
+				case ui.testList:
 					ui.focussed = ui.gameView
 				}
 				ui.focussed.setFocus(true)
@@ -252,7 +260,11 @@ func (ui *UI) render() {
 		ui.gameView.draw(b)
 		b.blit(ui.screen, math.Vec{0, 1})
 	}
-
+	{
+		b := newBuffer(width/2, gameViewHeight)
+		ui.testList.draw(b)
+		b.blit(ui.screen, math.Vec{width / 2, 1})
+	}
 	{
 		b := newBuffer(width, height-gameViewHeight-1)
 		ui.chatView.draw(b)