From b3d14d2dd4c0a3e5571b48192acfcd27c91e3a26 Mon Sep 17 00:00:00 2001
From: Elias Naur <mail@eliasnaur.com>
Date: Sun, 7 Jun 2020 14:05:15 +0200
Subject: [PATCH] example/windows: add example that demonstrates multiple
 windows

Updates gio#19

Signed-off-by: Elias Naur <mail@eliasnaur.com>
---
 example/windows/windows.go | 59 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 59 insertions(+)
 create mode 100644 example/windows/windows.go

diff --git a/example/windows/windows.go b/example/windows/windows.go
new file mode 100644
index 00000000..9a8fefc3
--- /dev/null
+++ b/example/windows/windows.go
@@ -0,0 +1,59 @@
+// SPDX-License-Identifier: Unlicense OR MIT
+
+package main
+
+// Multiple windows in Gio.
+
+import (
+	"log"
+
+	"gioui.org/app"
+	"gioui.org/io/event"
+	"gioui.org/io/system"
+	"gioui.org/layout"
+	"gioui.org/op"
+	"gioui.org/widget"
+	"gioui.org/widget/material"
+
+	"gioui.org/font/gofont"
+)
+
+type window struct {
+	btn widget.Clickable
+}
+
+func main() {
+	newWindow()
+	app.Main()
+}
+
+func newWindow() {
+	go func() {
+		w := new(window)
+		evts := app.NewWindow().Events()
+		if err := w.loop(evts); err != nil {
+			log.Fatal(err)
+		}
+	}()
+}
+
+func (w *window) loop(events <-chan event.Event) error {
+	th := material.NewTheme(gofont.Collection())
+	var ops op.Ops
+	for {
+		e := <-events
+		switch e := e.(type) {
+		case system.DestroyEvent:
+			return e.Err
+		case system.FrameEvent:
+			for w.btn.Clicked() {
+				newWindow()
+			}
+			gtx := layout.NewContext(&ops, e.Queue, e.Config, e.Size)
+			layout.Center.Layout(gtx, func(gtx layout.Context) layout.Dimensions {
+				return material.Button(th, &w.btn, "More!").Layout(gtx)
+			})
+			e.Frame(gtx.Ops)
+		}
+	}
+}