cmd/gogio: add gogio test for go import path

Signed-off-by: Walter Werner SCHNEIDER <contact@schnwalter.eu>
2026-07-02 16:06:19 +00:00 · 2020-11-26 20:05:54 +02:00
parent 9b54892cc4
commit 4f8150cd59
2 changed files with 16 additions and 10 deletions
@@ -0,0 +1,140 @@
+// SPDX-License-Identifier: Unlicense OR MIT
+
+// A simple app used for gogio's end-to-end tests.
+package main
+
+import (
+	"fmt"
+	"image"
+	"image/color"
+	"log"
+
+	"gioui.org/app"
+	"gioui.org/io/pointer"
+	"gioui.org/io/system"
+	"gioui.org/layout"
+	"gioui.org/op"
+	"gioui.org/op/clip"
+	"gioui.org/op/paint"
+)
+
+func main() {
+	go func() {
+		w := app.NewWindow()
+		if err := loop(w); err != nil {
+			log.Fatal(err)
+		}
+	}()
+	app.Main()
+}
+
+type notifyFrame int
+
+const (
+	notifyNone notifyFrame = iota
+	notifyInvalidate
+	notifyPrint
+)
+
+// notify keeps track of whether we want to print to stdout to notify the user
+// when a frame is ready. Initially we want to notify about the first frame.
+var notify = notifyInvalidate
+
+type (
+	C = layout.Context
+	D = layout.Dimensions
+)
+
+func loop(w *app.Window) error {
+	topLeft := quarterWidget{
+		color: color.NRGBA{R: 0xde, G: 0xad, B: 0xbe, A: 0xff},
+	}
+	topRight := quarterWidget{
+		color: color.NRGBA{R: 0xff, G: 0xff, B: 0xff, A: 0xff},
+	}
+	botLeft := quarterWidget{
+		color: color.NRGBA{R: 0x00, G: 0x00, B: 0x00, A: 0xff},
+	}
+	botRight := quarterWidget{
+		color: color.NRGBA{R: 0x00, G: 0x00, B: 0x00, A: 0x80},
+	}
+
+	var ops op.Ops
+	for {
+		e := <-w.Events()
+		switch e := e.(type) {
+		case system.DestroyEvent:
+			return e.Err
+		case system.FrameEvent:
+			gtx := layout.NewContext(&ops, e)
+			layout.Flex{Axis: layout.Vertical}.Layout(gtx,
+				layout.Flexed(1, func(gtx C) D {
+					return layout.Flex{Axis: layout.Horizontal}.Layout(gtx,
+						// r1c1
+						layout.Flexed(1, func(gtx C) D { return topLeft.Layout(gtx) }),
+						// r1c2
+						layout.Flexed(1, func(gtx C) D { return topRight.Layout(gtx) }),
+					)
+				}),
+				layout.Flexed(1, func(gtx C) D {
+					return layout.Flex{Axis: layout.Horizontal}.Layout(gtx,
+						// r2c1
+						layout.Flexed(1, func(gtx C) D { return botLeft.Layout(gtx) }),
+						// r2c2
+						layout.Flexed(1, func(gtx C) D { return botRight.Layout(gtx) }),
+					)
+				}),
+			)
+
+			e.Frame(gtx.Ops)
+
+			switch notify {
+			case notifyInvalidate:
+				notify = notifyPrint
+				w.Invalidate()
+			case notifyPrint:
+				notify = notifyNone
+				fmt.Println("gio frame ready")
+			}
+		}
+	}
+}
+
+// quarterWidget paints a quarter of the screen with one color. When clicked, it
+// turns red, going back to its normal color when clicked again.
+type quarterWidget struct {
+	color color.NRGBA
+
+	clicked bool
+}
+
+var red = color.NRGBA{R: 0xff, G: 0x00, B: 0x00, A: 0xff}
+
+func (w *quarterWidget) Layout(gtx layout.Context) layout.Dimensions {
+	var color color.NRGBA
+	if w.clicked {
+		color = red
+	} else {
+		color = w.color
+	}
+
+	r := image.Rectangle{Max: gtx.Constraints.Max}
+	paint.FillShape(gtx.Ops, color, clip.Rect(r).Op())
+
+	pointer.Rect(image.Rectangle{
+		Max: image.Pt(gtx.Constraints.Max.X, gtx.Constraints.Max.Y),
+	}).Add(gtx.Ops)
+	pointer.InputOp{
+		Tag:   w,
+		Types: pointer.Press,
+	}.Add(gtx.Ops)
+
+	for _, e := range gtx.Events(w) {
+		if e, ok := e.(pointer.Event); ok && e.Type == pointer.Press {
+			w.clicked = !w.clicked
+			// notify when we're done updating the frame.
+			notify = notifyInvalidate
+		}
+	}
+	return layout.Dimensions{Size: gtx.Constraints.Max}
+}