97 lines
2.0 KiB
Go
97 lines
2.0 KiB
Go
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// +build darwin linux
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package main
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import (
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"log"
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"image/color"
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"gioui.org/ui"
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"gioui.org/ui/app"
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"gioui.org/ui/layout"
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"gioui.org/ui/measure"
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"gioui.org/ui/text"
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"golang.org/x/image/font/sfnt"
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"golang.org/x/image/font/gofont/goregular"
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)
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var (
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face text.Face
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white = color.RGBA{A: 0xff, R: 0xff, G: 0xff, B: 0xff}
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gray = color.RGBA{A: 0xff, R: 0xb0, G: 0xb0, B: 0xb0}
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black = color.RGBA{A: 0xff, R: 0x00, G: 0x00, B: 0x00}
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labchan chan string
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)
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func main() {
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labchan = make(chan string)
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log.Print("Staring event loop")
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go eventloop()
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app.Main()
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log.Print("App closed")
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}
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func diffInsets(x, y app.Insets) bool {
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return x.Top != y.Top ||
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x.Bottom != y.Bottom ||
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x.Left != y.Left ||
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x.Right != y.Right
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}
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func eventloop() {
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w := app.NewWindow(
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app.WithWidth(ui.Dp(400)),
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app.WithHeight(ui.Dp(400)),
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app.WithTitle("Hello"))
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q := w.Queue()
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var c ui.Config
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ops := new(ui.Ops)
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//var dims layout.Dimensions
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var cs layout.Constraints
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var faces measure.Faces
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regular, err := sfnt.Parse(goregular.TTF)
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if err != nil { log.Fatal("Cannot parse font.") }
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face = faces.For(regular, ui.Sp(16))
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sysinset := &layout.Inset{}
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margin := layout.UniformInset(ui.Dp(10))
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labels := []*text.Label{}
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list := &layout.List{Axis: layout.Vertical}
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resetSysinset := func(x app.Insets) {
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sysinset.Top = x.Top
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sysinset.Bottom = x.Bottom
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sysinset.Left = x.Left
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sysinset.Right = x.Right
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}
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for {
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select {
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case x := <-labchan:
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labels = append(labels,&text.Label{Face: face, Text: x})
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case e := <-w.Events():
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switch e := e.(type) {
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case app.DestroyEvent:
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return
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case app.UpdateEvent:
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c = &e.Config
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ops.Reset()
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faces.Reset(c)
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resetSysinset(e.Insets)
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cs = layout.RigidConstraints(e.Size)
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cs = sysinset.Begin(c, ops, cs)
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cs = margin.Begin(c, ops, cs)
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for list.Init(c, q, ops, cs, len(labels)); list.More(); list.Next() {
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list.End(labels[list.Index()].Layout(ops, list.Constraints()))
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}
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sysinset.End(margin.End(list.Layout()))
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w.Update(ops)
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}
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}
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}
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}
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