67 lines
1.2 KiB
Go
67 lines
1.2 KiB
Go
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package main
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import (
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"fmt"
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"runtime"
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"golang.org/x/mobile/app"
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"golang.org/x/mobile/event/lifecycle"
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"golang.org/x/mobile/event/paint"
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"golang.org/x/mobile/event/size"
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"golang.org/x/mobile/event/touch"
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"golang.org/x/mobile/gl"
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)
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func main() {
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app.Main(func(a app.App) {
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var glctx gl.Context
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for e := range a.Events() {
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switch e := a.Filter(e).(type) {
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case lifecycle.Event:
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switch e.Crosses(lifecycle.StageVisible) {
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case lifecycle.CrossOn:
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glctx, _ = e.DrawContext.(gl.Context)
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onStart()
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case lifecycle.CrossOff:
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onStop()
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glctx = nil
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}
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case size.Event:
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onResize(e)
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case paint.Event:
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if glctx == nil {
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continue
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}
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onDraw(glctx)
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a.Publish()
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case touch.Event:
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onTouch(e)
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}
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}
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})
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}
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func onStart() {
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fmt.Println("App started")
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}
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func onStop() {
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fmt.Println("App stopped")
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}
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func onResize(e size.Event) {
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runtime.LockOSThread()
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gl.Viewport(0, 0, e.WidthPx, e.HeightPx)
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runtime.UnlockOSThread()
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}
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func onDraw(glctx gl.Context) {
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glctx.ClearColor(0.1, 0.1, 0.1, 1)
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glctx.Clear(gl.COLOR_BUFFER_BIT)
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}
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func onTouch(e touch.Event) {
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fmt.Printf("Touch event: X: %f, Y: %f\n", e.X, e.Y)
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}
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