start to make it a little real...

cmd/manage/main.go

@@ -1,6 +1,7 @@
 package main
 
 import (
+	"fmt"
 	"log"
 
 	"git.yetaga.in/alazyreader/library/config"
@@ -24,39 +25,58 @@ func main() {
 		log.Fatalln(err)
 	}
 	screen.Clear()
-	inc := 0
+	w, h := screen.Size()
+	l := &list{
+		w: w - 4, h: h - 4,
+		x: 2, y: 1,
+		selected:  2,
+		listItems: []string{"foo", "bar", "baz"},
+	}
+	b := &box{
+		w: w, h: h,
+		x: 0, y: 0,
+		title:     "library",
+		menuItems: []string{"(e)dit", "(q)uit"},
+		contents:  l,
+	}
 	for {
 		e := screen.PollEvent()
-		screen.Clear()
-		w, h := screen.Size()
-		b := &box{h: h, w: w, x: 0, y: 0, title: "library", menuItems: []string{"(e)dit", "(q)uit"}}
 		switch v := e.(type) {
 		case *tcell.EventError:
+			screen.Clear()
 			screen.Beep()
 			b.draw(screen)
 			screen.SetContent(1, 1, 'E', nil, tcell.StyleDefault)
-		case *tcell.EventInterrupt:
-			b.draw(screen)
-			screen.Sync()
 		case *tcell.EventKey:
-			inc += 1
-			b.draw(screen)
-			screen.SetContent(1, 1, v.Rune(), nil, tcell.StyleDefault)
-			screen.SetContent(2, 2, rune(inc+48), nil, tcell.StyleDefault)
+			screen.Clear()
+			if v.Key() == tcell.KeyUp && l.selected > 0 {
+				l.selected = l.selected - 1
+			}
+			if v.Key() == tcell.KeyDown && l.selected < len(l.listItems)-1 {
+				l.selected = l.selected + 1
+			}
 			if v.Rune() == 'q' {
 				screen.Fini()
+				fmt.Printf("Thank you for playing Wing Commander!\n\n")
 				return
 			}
-			screen.Sync()
-		case *tcell.EventMouse:
-			continue
-		case *tcell.EventResize:
 			b.draw(screen)
-			screen.Sync()
+		case *tcell.EventResize:
+			screen.Clear()
+			w, h := screen.Size()
+			b.w, b.h = w, h
+			b.draw(screen)
+		case *tcell.EventInterrupt:
+		case *tcell.EventMouse:
 		case *tcell.EventTime:
-			continue
+		default:
+		}
+		screen.Sync()
 	}
 }
+
+type drawable interface {
+	draw(tcell.Screen)
 }
 
 type box struct {
@@ -64,6 +84,7 @@ type box struct {
 	h, w      int
 	title     string
 	menuItems []string
+	contents  drawable
 }
 
 func (b *box) draw(s tcell.Screen) {
@@ -103,4 +124,25 @@ func (b *box) draw(s tcell.Screen) {
 			t++
 		}
 	}
+	if b.contents != nil {
+		b.contents.draw(s)
+	}
+}
+
+type list struct {
+	x, y      int
+	h, w      int
+	selected  int
+	listItems []string
+}
+
+func (l *list) draw(s tcell.Screen) {
+	for i := range l.listItems {
+		for j, r := range l.listItems[i] {
+			s.SetContent(l.x+j, l.y+i, r, nil, tcell.StyleDefault)
+		}
+		if i == l.selected {
+			s.SetContent(l.x+len(l.listItems[i])+1, l.y+i, '<', nil, tcell.StyleDefault)
+		}
+	}
 }