make it possible to switch between panels

cmd/manage/main.go

@@ -10,6 +10,11 @@ import (
 	"github.com/kelseyhightower/envconfig"
 )
 
+const (
+	IN_MENU = iota
+	IN_BOOK
+)
+
 func main() {
 	var c config.Config
 	err := envconfig.Process("library", &c)
@@ -28,21 +33,28 @@ func main() {
 	l := ui.NewList([]string{"foo", "bar", "baz"}, 0)
 	menu := ui.NewBox(
 		"library",
-		[]string{"(e)dit", "(q)uit"},
+		[]string{"(q)uit"},
 		ui.Contents{{
 			Offsets:   ui.Offsets{Top: 1, Left: 2, Bottom: -2, Right: -2},
 			Container: l,
 		}},
 	)
+	book := ui.NewBookDetails()
 	activeBook := ui.NewBox(
 		"book",
 		[]string{"test"},
-		ui.Contents{},
+		ui.Contents{{
+			Offsets:   ui.Offsets{Top: 1, Left: 2, Bottom: -2, Right: -2},
+			Container: book,
+		}},
 	)
 
 	container := ui.NewContainer(
-		ui.Contents{{Container: menu}, {Container: activeBook}},
-		ui.LayoutHorizontalEven,
+		ui.Contents{
+			{Container: menu, Offsets: ui.Offsets{Percent: 1}},
+			{Container: activeBook, Offsets: ui.Offsets{Percent: 2}},
+		},
+		ui.LayoutHorizontalPercent,
 	)
 
 	// init
@@ -52,6 +64,8 @@ func main() {
 	container.Draw(screen)
 	screen.Sync()
 
+	state := IN_MENU
+
 	// UI loop
 	for {
 		e := screen.PollEvent()
@@ -59,16 +73,25 @@ func main() {
 		case *tcell.EventError:
 			screen.Beep()
 		case *tcell.EventKey: // input handling
-			if v.Key() == tcell.KeyUp && l.Selected() > 0 {
-				l.SetSelected(l.Selected() - 1)
-			}
-			if v.Key() == tcell.KeyDown && l.Selected() < len(l.ListMembers())-1 {
-				l.SetSelected(l.Selected() + 1)
-			}
-			if v.Rune() == 'q' {
-				screen.Fini()
-				fmt.Printf("Thank you for playing Wing Commander!\n\n")
-				return
+			if state == IN_MENU {
+				if v.Key() == tcell.KeyUp && l.Selected() > 0 {
+					l.SetSelected(l.Selected() - 1)
+				}
+				if v.Key() == tcell.KeyDown && l.Selected() < len(l.ListMembers())-1 {
+					l.SetSelected(l.Selected() + 1)
+				}
+				if v.Rune() == 'q' {
+					screen.Fini()
+					fmt.Printf("Thank you for playing Wing Commander!\n\n")
+					return
+				}
+				if v.Key() == tcell.KeyRight {
+					state = IN_BOOK
+				}
+			} else if state == IN_BOOK {
+				if v.Key() == tcell.KeyLeft {
+					state = IN_MENU
+				}
 			}
 			screen.Clear()
 			container.Draw(screen)

ui/ui.go

@@ -3,6 +3,7 @@ package ui
 import (
 	"strings"
 
+	"git.yetaga.in/alazyreader/library/book"
 	"github.com/gdamore/tcell"
 )
 
@@ -266,6 +267,32 @@ func (l *List) ListMembers() []string {
 	return l.listItems
 }
 
+// A List is a scrollable, pageable list with a selector token.
+type BookDetails struct {
+	x, y     int
+	h, w     int
+	selected int
+	book     book.Book
+}
+
+func NewBookDetails() *BookDetails {
+	return &BookDetails{}
+}
+
+func (l *BookDetails) SetSize(x, y, h, w int) {
+	l.x, l.y, l.h, l.w = x, y, h, w
+}
+
+func (l *BookDetails) Draw(s tcell.Screen) {
+	items := []string{"title", "authors", "isbn-10", "isbn-13"}
+	for i := range items {
+		for j, r := range items[i] {
+			s.SetContent(l.x+j, l.y+i, r, nil, tcell.StyleDefault)
+		}
+		s.SetContent(l.x+len(items[i]), l.y+i, ':', nil, tcell.StyleDefault)
+	}
+}
+
 // PaddedText outputs strings with a space on both sides.
 // Useful for generating headings, footers, etc. Used by Box.
 type PaddedText struct {