Implement basic connection statemachine

This prepares a real TCP / XMPP connection.

1 files changed, 51 insertions, 25 deletions

diff --git a/go/main.go b/go/main.go
index aad9a29..f7e7ee9 100644
--- a/go/main.go
+++ b/go/main.go
@@ -16,14 +16,22 @@ import (
 	"gioui.org/widget/material"
 )
 
+type LimoxState uint8
+
+const (
+	Disconnected LimoxState = iota
+	Connecting
+	Connected
+)
+
 type Limox struct {
-	JidEditor        widget.Editor
-	PwdEditor        widget.Editor
-	ConnectClickable widget.Clickable
-	Connecting       bool
-	Window           *app.Window
-	Operations       op.Ops
-	Theme            *material.Theme
+	JidEditor       widget.Editor
+	PwdEditor       widget.Editor
+	MainButton      widget.Clickable
+	State           LimoxState
+	Window          *app.Window
+	Operations      op.Ops
+	Theme           *material.Theme
 }
 
 func main() {
@@ -46,9 +54,9 @@ func NewLimox() Limox {
 			app.Title("LimoX"),
 			app.Size(unit.Dp(400), unit.Dp(600)),
 		),
-		Operations: op.Ops{},
-		Theme:      material.NewTheme(gofont.Collection()),
-		Connecting: false,
+		Operations:      op.Ops{},
+		Theme:           material.NewTheme(gofont.Collection()),
+		State:           Disconnected,
 	}
 }
 
@@ -59,20 +67,28 @@ func (l *Limox) run() error {
 		case system.DestroyEvent:
 			return e.Err
 		case system.FrameEvent:
-			if l.ConnectClickable.Clicked() {
-				l.Connecting = !l.Connecting
-				if l.Connecting {
-					log.Printf("User wants to connect with '%s' and '%s'.\n",
-						l.JidEditor.Text(),
-						l.PwdEditor.Text(),
-					)
-				}
+			if l.MainButton.Clicked() {
+				l.buttonCallback()
 			}
 			l.draw(e)
 		}
 	}
 }
 
+func (l *Limox) buttonCallback() {
+	switch l.State {
+	case Disconnected:
+		log.Println("Starting connection establishment")
+		l.State = Connecting
+	case Connecting:
+		log.Println("Aborted connection establishment")
+		l.State = Disconnected
+	case Connected:
+		log.Println("Disconnected")
+		l.State = Disconnected
+	}
+}
+
 func (l *Limox) draw(e system.FrameEvent) {
 	gtx := layout.NewContext(&l.Operations, e)
 
@@ -107,13 +123,8 @@ func (l *Limox) draw(e system.FrameEvent) {
 		),
 		layout.Rigid(
 			func(gtx layout.Context) layout.Dimensions {
-				var label string
-				if l.Connecting {
-					label = "abort"
-				} else {
-					label = "connect"
-				}
-				btn := material.Button(l.Theme, &l.ConnectClickable, label)
+				btn := material.Button(l.Theme, &l.MainButton,
+					l.buttonLabel())
 				return btn.Layout(gtx)
 			},
 		),
@@ -121,3 +132,18 @@ func (l *Limox) draw(e system.FrameEvent) {
 
 	e.Frame(gtx.Ops)
 }
+
+func (l *Limox) buttonLabel() string {
+	var label string
+	switch l.State {
+		case Disconnected:
+			label = "Connect"
+		case Connecting:
+			label = "Abort"
+		case Connected:
+			label = "Disconnect"
+		default:
+			log.Fatalf("Unknown Limox state '%d'\n", l.State)
+	}
+	return label
+}