android-go/examples/sensors/main.go
2020-06-11 10:42:43 -04:00

87 lines
1.6 KiB
Go

// +build darwin linux
package main
import (
"log"
"gioui.org/app"
"gioui.org/io/system"
"gioui.org/layout"
"gioui.org/op"
"gioui.org/unit"
"gioui.org/widget/material"
"gioui.org/font/gofont"
)
var (
labchan chan string
)
type (
D = layout.Dimensions
C = layout.Context
)
func main() {
labchan = make(chan string)
log.Print("Staring event loop")
go eventloop()
app.Main()
log.Print("App closed")
}
func diffInsets(x, y system.Insets) bool {
return x.Top != y.Top ||
x.Bottom != y.Bottom ||
x.Left != y.Left ||
x.Right != y.Right
}
func eventloop() {
w := app.NewWindow(
app.Size(unit.Dp(400), unit.Dp(400)),
app.Title("Hello"))
th := material.NewTheme(gofont.Collection())
var ops op.Ops
sysinset := &layout.Inset{}
margin := layout.UniformInset(unit.Dp(10))
labels := []material.LabelStyle{}
list := &layout.List{Axis: layout.Vertical}
resetSysinset := func(x system.Insets) {
sysinset.Top = x.Top
sysinset.Bottom = x.Bottom
sysinset.Left = x.Left
sysinset.Right = x.Right
}
go func() {
labchan <- "Starting"
}()
for {
select {
case x := <-labchan:
labels = append(labels, material.Body1(th, x))
case e := <-w.Events():
switch e := e.(type) {
case system.DestroyEvent:
return
case system.FrameEvent:
gtx := layout.NewContext(&ops, e)
resetSysinset(e.Insets)
sysinset.Layout(gtx, func(gtx C) D {
return margin.Layout(gtx, func(gtx C) D {
return list.Layout(gtx, len(labels), func(gtx C, i int) D {
return labels[i].Layout(gtx)
})
})
})
e.Frame(gtx.Ops)
}
}
}
}