attach PeersState under Data for ViewController

Signed-off-by: Jakub Sokołowski <jakub@status.im>

keys.go

@@ -12,15 +12,21 @@ type Binding struct {
 	Handler func(g *gocui.Gui, v *gocui.View) error
 }
 
-func (vc *View) CursorUp(g *gocui.Gui, v *gocui.View) error {
-	return MoveCursor(-1, g, v)
+func (vc *ViewController) CursorUp(g *gocui.Gui, v *gocui.View) error {
+	return MoveCursor(-1, v)
 }
 
-func (vc *View) CursorDown(g *gocui.Gui, v *gocui.View) error {
-	return MoveCursor(1, g, v)
+func (vc *ViewController) CursorDown(g *gocui.Gui, v *gocui.View) error {
+	peers := vc.Data.(*PeersState).list
+	_, cy := v.Cursor()
+	// Don't go beyond available list of peers
+	if cy+1 >= len(peers) {
+		return nil
+	}
+	return MoveCursor(1, v)
 }
 
-func MoveCursor(mod int, g *gocui.Gui, v *gocui.View) error {
+func MoveCursor(mod int, v *gocui.View) error {
 	if v == nil {
 		return nil
 	}

main.go

@@ -1,7 +1,6 @@
 package main
 
 import (
-	"fmt"
 	"github.com/jroimartin/gocui"
 	"log"
 	"os"
@@ -28,7 +27,9 @@ func main() {
 	}
 	defer g.Close()
 
-	mainView := &View{
+	peers := NewPeersState(host, port)
+
+	mainView := &ViewController{
 		Name:        "main",
 		Title:       "Peers",
 		Placeholder: "Loading peers...",
@@ -37,6 +38,7 @@ func main() {
 		Current:     true,
 		SelFgColor:  gocui.ColorBlack,
 		SelBgColor:  gocui.ColorGreen,
+		Data:        peers,
 		TopLeft: func(mx, my int) (int, int) {
 			return 0, 0
 		},
@@ -50,7 +52,7 @@ func main() {
 		Binding{gocui.KeyArrowUp, gocui.ModNone, mainView.CursorUp},
 		Binding{gocui.KeyArrowDown, gocui.ModNone, mainView.CursorDown},
 	}
-	infoView := &View{
+	infoView := &ViewController{
 		Name:        "info",
 		Title:       "Details",
 		Placeholder: "Loading details...",
@@ -62,20 +64,14 @@ func main() {
 		},
 	}
 
-	views := []*View{mainView, infoView}
+	views := []*ViewController{mainView, infoView}
 
 	vm := NewViewManager(g, views)
 
 	g.SetManagerFunc(vm.Layout)
 
-	url := fmt.Sprintf("http://%s:%d", host, port)
-	c, err := newClient(url)
-	if err != nil {
-		log.Panicln(err)
-	}
-
 	// Start RPC calling routine
-	go FetchPeers(c, g)
+	go peers.Fetch(g)
 
 	if err := g.MainLoop(); err != nil && err != gocui.ErrQuit {
 		log.Panicln(err)

peers.go

@@ -8,23 +8,38 @@ import (
 	"time"
 )
 
-func FetchPeers(c *client, g *gocui.Gui) {
+type PeersState struct {
+	c    *client
+	list []Peer
+}
+
+func NewPeersState(host string, port int) *PeersState {
+	url := fmt.Sprintf("http://%s:%d", host, port)
+	c, err := newClient(url)
+	if err != nil {
+		log.Panicln(err)
+	}
+	return &PeersState{c: c}
+}
+
+func (p *PeersState) Fetch(g *gocui.Gui) {
 	for {
 		select {
 		case <-threadDone:
 			return
 		default:
-			peers, err := c.getPeers()
+			peers, err := p.c.getPeers()
 			if err != nil {
 				log.Panicln(err)
 			}
-			WritePeers(g, peers)
+			p.list = peers
+			writePeers(g, peers)
 		}
 		<-time.After(interval * time.Second)
 	}
 }
 
-func WritePeers(g *gocui.Gui, peers []Peer) {
+func writePeers(g *gocui.Gui, peers []Peer) {
 	g.Update(func(g *gocui.Gui) error {
 		v, err := g.View("main")
 		if err != nil {

view.go

@@ -6,7 +6,7 @@ import (
 	"github.com/jroimartin/gocui"
 )
 
-type View struct {
+type ViewController struct {
 	Name        string
 	Title       string
 	Placeholder string
@@ -19,14 +19,15 @@ type View struct {
 	SelFgColor  gocui.Attribute
 	Keybindings []Binding
 	Manager     ViewManager
+	Data        interface{}
 }
 
 type ViewManager struct {
 	g     *gocui.Gui
-	views []*View
+	views []*ViewController
 }
 
-func NewViewManager(g *gocui.Gui, views []*View) *ViewManager {
+func NewViewManager(g *gocui.Gui, views []*ViewController) *ViewManager {
 	vm := ViewManager{
 		g:     g,
 		views: views,
@@ -66,7 +67,7 @@ func (m *ViewManager) Layout(g *gocui.Gui) error {
 	return nil
 }
 
-func (v *View) SetKeybindings(g *gocui.Gui) error {
+func (v *ViewController) SetKeybindings(g *gocui.Gui) error {
 	for _, b := range v.Keybindings {
 		// IDEA: I can pass a method instead of a function here
 		if err := g.SetKeybinding("", b.Key, b.Mod, b.Handler); err != nil {