mirror of
https://git.sr.ht/~eliasnaur/gio
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Elias Naur
128 lines
3.0 KiB
Go
128 lines
3.0 KiB
Go
// SPDX-License-Identifier: Unlicense OR MIT
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// A simple app used for gogio's end-to-end tests.
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package main
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import (
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"fmt"
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"image"
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"image/color"
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"log"
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"gioui.org/app"
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"gioui.org/f32"
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"gioui.org/io/pointer"
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"gioui.org/io/system"
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"gioui.org/layout"
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"gioui.org/op/paint"
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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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type notifyFrame int
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const (
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notifyNone notifyFrame = iota
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notifyInvalidate
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notifyPrint
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)
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// notify keeps track of whether we want to print to stdout to notify the user
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// when a frame is ready. Initially we want to notify about the first frame.
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var notify = notifyInvalidate
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func loop(w *app.Window) error {
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topLeft := quarterWidget{
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color: color.RGBA{R: 0xde, G: 0xad, B: 0xbe, A: 0xff},
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}
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topRight := quarterWidget{
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color: color.RGBA{R: 0xff, G: 0xff, B: 0xff, A: 0xff},
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}
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botLeft := quarterWidget{
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color: color.RGBA{R: 0x00, G: 0x00, B: 0x00, A: 0xff},
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}
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botRight := quarterWidget{
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color: color.RGBA{R: 0x00, G: 0x00, B: 0x00, A: 0x80},
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}
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gtx := layout.NewContext(w.Queue())
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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 system.DestroyEvent:
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return e.Err
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case system.FrameEvent:
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gtx.Reset(e.Config, e.Size)
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rows := layout.Flex{Axis: layout.Vertical}
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r1 := rows.Flex(gtx, 0.5, func() {
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columns := layout.Flex{Axis: layout.Horizontal}
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r1c1 := columns.Flex(gtx, 0.5, func() { topLeft.Layout(gtx) })
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r1c2 := columns.Flex(gtx, 0.5, func() { topRight.Layout(gtx) })
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columns.Layout(gtx, r1c1, r1c2)
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})
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r2 := rows.Flex(gtx, 0.5, func() {
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columns := layout.Flex{Axis: layout.Horizontal}
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r2c1 := columns.Flex(gtx, 0.5, func() { botLeft.Layout(gtx) })
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r2c2 := columns.Flex(gtx, 0.5, func() { botRight.Layout(gtx) })
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columns.Layout(gtx, r2c1, r2c2)
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})
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rows.Layout(gtx, r1, r2)
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e.Frame(gtx.Ops)
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switch notify {
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case notifyInvalidate:
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notify = notifyPrint
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w.Invalidate()
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case notifyPrint:
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notify = notifyNone
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fmt.Println("frame ready")
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}
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}
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}
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}
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// quarterWidget paints a quarter of the screen with one color. When clicked, it
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// turns red, going back to its normal color when clicked again.
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type quarterWidget struct {
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color color.RGBA
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clicked bool
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}
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var red = color.RGBA{R: 0xff, G: 0x00, B: 0x00, A: 0xff}
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func (w *quarterWidget) Layout(gtx *layout.Context) {
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if w.clicked {
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paint.ColorOp{Color: red}.Add(gtx.Ops)
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} else {
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paint.ColorOp{Color: w.color}.Add(gtx.Ops)
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}
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paint.PaintOp{Rect: f32.Rectangle{Max: f32.Point{
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X: float32(gtx.Constraints.Width.Max),
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Y: float32(gtx.Constraints.Height.Max),
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}}}.Add(gtx.Ops)
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pointer.Rect(image.Rectangle{
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Max: image.Pt(gtx.Constraints.Width.Max, gtx.Constraints.Height.Max),
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}).Add(gtx.Ops)
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pointer.InputOp{Key: w}.Add(gtx.Ops)
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for _, e := range gtx.Events(w) {
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if e, ok := e.(pointer.Event); ok && e.Type == pointer.Press {
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w.clicked = !w.clicked
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// notify when we're done updating the frame.
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notify = notifyInvalidate
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}
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}
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}
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