Downgrade to pre-Blessed version of git.wow.st/gmp/ble.

Improve layout generally and add wide (horizontal) layouts.

Add stopwatch widget.

go.mod

@@ -4,7 +4,7 @@ go 1.13
 
 require (
 	gioui.org v0.0.0-20191126175243-2ca2e5462f16
-	git.wow.st/gmp/ble v0.0.0-20191205134941-3bc712870db2
+	git.wow.st/gmp/ble v0.0.0-20191127164604-2af636b9461a
 	github.com/google/go-github/v24 v24.0.1 // indirect
 	golang.org/x/oauth2 v0.0.0-20191122200657-5d9234df094c // indirect
 	gopkg.in/yaml.v2 v2.2.7

main.go

@@ -9,6 +9,7 @@ import (
 	"log"
 	"os"
 	"path"
+	"time"
 
 	"git.wow.st/gmp/ble"
 
@@ -77,9 +78,25 @@ func hrDecode(x []byte) int {
 	}
 }
 
+type Stopwatch struct {
+	lasttime time.Time
+	elapsed time.Time
+	running bool
+	startstopBtn *widget.Button
+	resetBtn *widget.Button
+	h, m, s int
+}
+
+func NewStopwatch() Stopwatch {
+	return Stopwatch{
+		startstopBtn: &widget.Button{},
+		resetBtn: &widget.Button{},
+	}
+}
+
 func eventloop() {
 	w := app.NewWindow(
-		app.Size(unit.Dp(400), unit.Dp(400)),
+		app.Size(unit.Dp(350), unit.Dp(600)),
 		app.Title("HRM"),
 	)
 	gofont.Register()
@@ -121,9 +138,21 @@ func eventloop() {
 		)
 	}
 
-	appname := func() { th.Body1("Heart Rate Monitor").Layout(gtx) }
+	appname := func() {
-	appstate := func() { th.Body1(state).Layout(gtx) }
+		layout.Align(layout.Center).Layout(gtx, func() {
-	periphname := func() { th.Body1(periph.Name).Layout(gtx) }
+			th.Body1("Heart Rate Monitor").Layout(gtx)
+		})
+	}
+	appstate := func() {
+		layout.Align(layout.Center).Layout(gtx, func() {
+			th.Body1(state).Layout(gtx)
+		})
+	}
+	periphname := func() {
+		layout.Align(layout.Center).Layout(gtx, func() {
+			th.Body1("COOSPO").Layout(gtx)
+		})
+	}
 
 	leftbar := func() {
 		f := &layout.Flex{Axis: layout.Vertical}
@@ -171,9 +200,7 @@ func eventloop() {
 	connpage = func() {
 		f.Layout(gtx,
 			f.Rigid(gtx, appname),
-			f.Rigid(gtx, func() {
+			f.Rigid(gtx, appstate),
-				th.Body1("Connecting").Layout(gtx)
-			}),
 			f.Rigid(gtx, periphname),
 			f.Rigid(gtx, func() {
 				th.Button("Cancel").Layout(gtx, backBtn)
@@ -190,10 +217,12 @@ func eventloop() {
 		)
 	}
 
-	hrcircle := func() {
+	hrcircle := func() int {
+		var w, h1 float32
+		layout.Align(layout.Center).Layout(gtx, func() {
 			blue := color.RGBA{0x3f, 0x51, 0xb5, 255}
 			white := color.RGBA{255, 255, 255, 255}
-		w, h1 := float32(gtx.Constraints.Width.Max), float32(gtx.Constraints.Height.Max)
+			w, h1 = float32(gtx.Constraints.Width.Max), float32(gtx.Constraints.Height.Max)
 			if w < h1 {
 				h1 = w
 			}
@@ -219,16 +248,118 @@ func eventloop() {
 				l.Layout(gtx)
 			})
 			gtx.Dimensions.Size = image.Point{int(h1), int(h1)}
+		})
+		return int(h1)
 	}
 
+	sw := NewStopwatch()
+
+	stopwatch := func() {
+		startstoptxt := "start"
+		if sw.running {
+			sw.elapsed = sw.elapsed.Add(time.Since(sw.lasttime))
+			startstoptxt = "stop"
+		}
+		sw.lasttime = time.Now()
+		f := layout.Flex{Axis: layout.Vertical}
+		f.Layout(gtx,
+			f.Rigid(gtx, func() {
+				layout.Align(layout.Center).Layout(gtx, func() {
+					gtx.Constraints.Width.Max = 1e6
+					th.H4(sw.elapsed.Format("15:04:05.00")).Layout(gtx)
+				})
+			}),
+			f.Rigid(gtx, func() {
+				f2 := layout.Flex{Axis: layout.Horizontal}
+				gtx.Constraints.Height.Min = 100
+				f2.Layout(gtx,
+					f2.Flex(gtx, 0.5, func() {
+						layout.UniformInset(unit.Dp(2)).Layout(gtx, func() {
+							th.Button(startstoptxt).Layout(gtx, sw.startstopBtn)
+						})
+					}),
+					f2.Flex(gtx, 0.5, func() {
+						layout.UniformInset(unit.Dp(2)).Layout(gtx, func() {
+							th.Button("reset").Layout(gtx, sw.resetBtn)
+						})
+					}),
+				)
+				if sw.startstopBtn.Clicked(gtx) {
+					if sw.running {
+						sw.running = false
+					} else {
+						sw.running = true
+					}
+				}
+				if sw.resetBtn.Clicked(gtx) {
+					sw.elapsed = time.Time{}
+					sw.running = false
+				}
+			}),
+		)
+	}
+
+	swidth := new(int)
+	*swidth = 900
 	hrpage = func() {
+		stopbtn := func() {
+			gtx.Constraints.Width.Min = *swidth
+			gtx.Constraints.Height.Min = 100
+			layout.UniformInset(unit.Dp(2)).Layout(gtx, func() {
+				th.Button("Disconnect").Layout(gtx, backBtn)
+			})
+		}
+		if wide {
+			f2 := &layout.Flex{Axis: layout.Horizontal}
+			f2.Layout(gtx,
+				f2.Flex(gtx, 0.4, func() {
+					f3 := &layout.Flex{Axis: layout.Vertical}
+					c1 := f3.Rigid(gtx, func() {
+						appname()
+						*swidth = gtx.Dimensions.Size.X
+					})
+					c2 := f3.Rigid(gtx, func() {
+						periphname()
+						s2 := gtx.Dimensions.Size.X
+						if s2 > *swidth {
+							*swidth = s2
+						}
+					})
+					c3 := f3.Rigid(gtx, stopwatch)
+					c4 := f3.Rigid(gtx, stopbtn)
+					f3.Layout(gtx,
+						c1,
+						f3.Rigid(gtx, appstate),
+						c2,
+						f3.Flex(gtx, 1.0, func() { th.Body1("").Layout(gtx) }),
+						c3,
+						c4,
+					)
+				}),
+				f2.Flex(gtx, 0.6, func() { hrcircle() }),
+			)
+		} else { // !wide
+			c1 := f.Rigid(gtx, func() {
+				layout.Align(layout.Center).Layout(gtx, func() {
+					gtx.Constraints.Width.Min = *swidth
+					gtx.Constraints.Width.Max = *swidth
+					stopwatch()
+				})
+			})
+			c2 := f.Rigid(gtx, func() {
+				layout.Align(layout.Center).Layout(gtx, stopbtn)
+			})
 			f.Layout(gtx,
 				f.Rigid(gtx, appname),
+				f.Rigid(gtx, appstate),
 				f.Rigid(gtx, periphname),
-			f.Rigid(gtx, func() {
+				f.Flex(gtx, 1.0, func() {
-				layout.UniformInset(unit.Dp(2)).Layout(gtx, func() {
+					*swidth = hrcircle()
-					th.Button("Stop").Layout(gtx, backBtn)
+				}),
-				})
+				c1,
+				c2,
+			)
+		}
 		if backBtn.Clicked(gtx) {
 			ble.Disconnect(periph)
 			periphs = periphs[:0]
@@ -238,15 +369,15 @@ func eventloop() {
 			state = "scanning"
 			page = scanpage
 		}
-			}),
-			f.Rigid(gtx, hrcircle),
-		)
 	}
 
 	page = offpage
 
+	t := time.NewTicker(time.Second/30)
 	for {
 		select {
+		case <-t.C:
+			w.Invalidate()
 		case e := <-b.Events():
 			switch e := e.(type) {
 			case ble.UpdateStateEvent: