Add buttons to cancel connection attempts and disconnect from

connected devices.

main.go

@@ -93,6 +93,7 @@ func eventloop() {
 	var periph ble.Peripheral
 	periphs := make([]ble.Peripheral, 0)
 	btns := make([]*widget.Button, 0)
+	backBtn := &widget.Button{}
 
 	var page, offpage, scanpage, connpage, hrpage func()
 
@@ -121,6 +122,7 @@ func eventloop() {
 					b.StopScan()
 					periph = periphs[i]
 					b.Connect(periph)
+					state = "connecting"
 					page = connpage
 					w.Invalidate()
 				}
@@ -139,7 +141,19 @@ func eventloop() {
 		c3 := f.Rigid(gtx, func() {
 			th.Body1(periph.Name).Layout(gtx)
 		})
-		f.Layout(gtx, c1, c2, c3)
+		c4 := f.Rigid(gtx, func() {
+			th.Button("Cancel").Layout(gtx, backBtn)
+			if backBtn.Clicked(gtx) {
+				ble.CancelConnection(periph)
+				periphs = periphs[:0]
+				Config.Autoconnect = ""
+				saveConfig()
+				b.Scan()
+				state = "scanning"
+				page = scanpage
+			}
+		})
+		f.Layout(gtx, c1, c2, c3, c4)
 	}
 
 	hrpage = func() {
@@ -154,7 +168,19 @@ func eventloop() {
 			l.Alignment = text.Middle
 			l.Layout(gtx)
 		})
-		f.Layout(gtx, c1, c2, c3)
+		c4 := f.Rigid(gtx, func() {
+			th.Button("Stop").Layout(gtx, backBtn)
+			if backBtn.Clicked(gtx) {
+				ble.Disconnect(periph)
+				periphs = periphs[:0]
+				Config.Autoconnect = ""
+				saveConfig()
+				b.Scan()
+				state = "scanning"
+				page = scanpage
+			}
+		})
+		f.Layout(gtx, c1, c2, c3, c4)
 	}
 
 	page = offpage
@@ -170,13 +196,16 @@ func eventloop() {
 				fmt.Printf("UpdateState: %s\n", e.State)
 				state = e.State
 				if state != "powered on" {
+					periphs = periphs[:0]
 					page = offpage
 				} else {
 
 					if Config.Autoconnect != "" && b.Connect(ble.Peripheral{Identifier: Config.Autoconnect}) {
+						state = "connecting"
 						page = connpage
 					} else {
 						periphs = periphs[:0]
+						state = "scanning"
 						page = scanpage
 						b.Scan()
 					}
@@ -186,10 +215,12 @@ func eventloop() {
 				periphs = append(periphs, e.Peripheral)
 				btns = append(btns, &widget.Button{})
 				if e.Peripheral.Identifier == Config.Autoconnect && b.Connect(e.Peripheral) {
+					state = "connecting"
 					page = connpage
 				}
 			case ble.ConnectEvent:
 				fmt.Printf("Connect event\n")
+				b.StopScan()
 				state = "connected"
 				periph = e.Peripheral
 				Config.Autoconnect = periph.Identifier