1 files changed, 60 insertions, 0 deletions
diff --git a/examples/layout/blinker.go b/examples/layout/blinker.go
new file mode 100644
index 0000000..76dbd95
--- /dev/null
+++ b/examples/layout/blinker.go
@@ -0,0 +1,60 @@
+package main
+
+import (
+	"image"
+	"image/draw"
+	"log"
+	"time"
+
+	"github.com/faiface/gui"
+	"github.com/faiface/gui/win"
+	"golang.org/x/image/colornames"
+)
+
+func Blinker(env gui.Env) {
+	defer func() {
+		if recover() != nil {
+			log.Print("recovered blinker")
+		}
+	}()
+
+	var r image.Rectangle
+	var visible bool = true
+
+	redraw := func() func(draw.Image) image.Rectangle {
+		return func(drw draw.Image) image.Rectangle {
+			if visible {
+				draw.Draw(drw, r, image.White, image.ZP, draw.Src)
+			} else {
+				draw.Draw(drw, r, &image.Uniform{colornames.Firebrick}, image.ZP, draw.Src)
+			}
+			return r
+		}
+	}
+
+	// first we draw a white rectangle
+	env.Draw() <- redraw()
+	func() {
+		for event := range env.Events() {
+			switch event := event.(type) {
+			case win.MoDown:
+				if event.Point.In(r) {
+					go func() {
+						for i := 0; i < 3; i++ {
+							visible = false
+							env.Draw() <- redraw()
+							time.Sleep(time.Second / 3)
+							visible = true
+							env.Draw() <- redraw()
+							time.Sleep(time.Second / 3)
+						}
+					}()
+				}
+			case gui.Resize:
+				log.Print(event)
+				r = event.Rectangle
+				env.Draw() <- redraw()
+			}
+		}
+	}()
+}