refactor to make arrow key handlers into methods of *View

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

keys.go

@@ -12,8 +12,15 @@ type Binding struct {
 	Handler func(g *gocui.Gui, v *gocui.View) error
 }
 
-func HandlerCursorDispenser(mod int) func(g *gocui.Gui, v *gocui.View) error {
-	return 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 *View) CursorDown(g *gocui.Gui, v *gocui.View) error {
+	return MoveCursor(1, g, v)
+}
+
+func MoveCursor(mod int, g *gocui.Gui, v *gocui.View) error {
 	if v == nil {
 		return nil
 	}
@@ -34,4 +41,3 @@ func HandlerCursorDispenser(mod int) func(g *gocui.Gui, v *gocui.View) error {
 	}
 	return nil
 }
-}

main.go

@@ -28,8 +28,7 @@ func main() {
 	}
 	defer g.Close()
 
-	views := []*View{
-		&View{
+	mainView := &View{
 		Name:        "main",
 		Title:       "Peers",
 		Placeholder: "Loading peers...",
@@ -38,19 +37,20 @@ func main() {
 		Current:     true,
 		SelFgColor:  gocui.ColorBlack,
 		SelBgColor:  gocui.ColorGreen,
-			Keybindings: []Binding{
-				Binding{gocui.KeyCtrlC, gocui.ModNone, quit},
-				Binding{gocui.KeyArrowUp, gocui.ModNone, HandlerCursorDispenser(-1)},
-				Binding{gocui.KeyArrowDown, gocui.ModNone, HandlerCursorDispenser(1)},
-			},
 		TopLeft: func(mx, my int) (int, int) {
 			return 0, 0
 		},
 		BotRight: func(mx, my int) (int, int) {
 			return mx - 1, my / 2
 		},
-		},
-		&View{
+	}
+	// bindings defined separately so handlers can reference mainView
+	mainView.Keybindings = []Binding{
+		Binding{gocui.KeyCtrlC, gocui.ModNone, quit},
+		Binding{gocui.KeyArrowUp, gocui.ModNone, mainView.CursorUp},
+		Binding{gocui.KeyArrowDown, gocui.ModNone, mainView.CursorDown},
+	}
+	infoView := &View{
 		Name:        "info",
 		Title:       "Details",
 		Placeholder: "Loading details...",
@@ -60,9 +60,10 @@ func main() {
 		BotRight: func(mx, my int) (int, int) {
 			return mx - 1, my - 1
 		},
-		},
 	}
 
+	views := []*View{mainView, infoView}
+
 	vm := NewViewManager(g, views)
 
 	g.SetManagerFunc(vm.Layout)