forked from joejulian/gio
Elias Naur
66 lines
1.3 KiB
Go
66 lines
1.3 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"
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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/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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wopt := app.WindowOptions{Width: ui.Px(612), Height: ui.Px(792), Title: "Hello"}
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if err := app.CreateWindow(&wopt); err != nil {
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log.Fatal(err)
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}
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app.Main()
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}
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// On iOS and Android main will never be called, so
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// setting up the window must run in an init function.
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func init() {
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go func() {
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for w := range app.Windows() {
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go loop(w)
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}
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}()
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}
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func loop(w *app.Window) {
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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 := &image.Uniform{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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ops := new(ui.Ops)
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for w.IsAlive() {
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e := <-w.Events()
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switch e := e.(type) {
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case app.Draw:
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faces.Cfg = e.Config
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cs := layout.ExactConstraints(w.Size())
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ops.Reset()
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(text.Label{Src: maroon, Face: face, Alignment: text.Center, Text: message}).Layout(ops, cs)
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w.Draw(ops)
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faces.Frame()
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}
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}
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if err := w.Err(); err != nil {
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log.Fatal(err)
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}
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}
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