forked from joejulian/gio
Elias Naur
61 lines
1.2 KiB
Go
61 lines
1.2 KiB
Go
// SPDX-License-Identifier: Unlicense OR MIT
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package main
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// A simple Gio program. See https://gioui.org for more information.
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import (
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"image/color"
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"log"
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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/paint"
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"gioui.org/ui/text"
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"golang.org/x/image/font/gofont/goregular"
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"golang.org/x/image/font/sfnt"
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)
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func main() {
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go func() {
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w := app.NewWindow()
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if err := loop(w); err != nil {
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log.Fatal(err)
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}
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}()
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app.Main()
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}
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func loop(w *app.Window) error {
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regular, err := sfnt.Parse(goregular.TTF)
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if err != nil {
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panic("failed to load font")
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}
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var faces measure.Faces
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maroon := color.RGBA{127, 0, 0, 255}
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face := faces.For(regular, ui.Sp(72))
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message := "Hello, Gio"
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c := &layout.Context{
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Queue: w.Queue(),
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}
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for {
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e := <-w.Events()
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switch e := e.(type) {
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case app.DestroyEvent:
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return e.Err
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case app.UpdateEvent:
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c.Reset(&e.Config, layout.RigidConstraints(e.Size))
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faces.Reset(c.Config)
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var material ui.MacroOp
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material.Record(c.Ops)
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paint.ColorOp{Color: maroon}.Add(c.Ops)
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material.Stop()
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text.Label{Material: material, Face: face, Alignment: text.Middle, Text: message}.Layout(c)
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w.Update(c.Ops)
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}
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}
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}
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