1 files changed, 71 insertions, 0 deletions
diff --git a/examples/layout/blinker.go b/examples/layout/blinker.go
new file mode 100644
index 0000000..65dce43
--- /dev/null
+++ b/examples/layout/blinker.go
@@ -0,0 +1,71 @@
+package main
+
+import (
+	"image"
+	"image/color"
+	"image/draw"
+	"log"
+	"math/rand"
+	"sync"
+	"time"
+
+	"github.com/faiface/gui"
+	"github.com/faiface/gui/win"
+)
+
+func Blinker(env gui.Env) {
+	defer func() {
+		if recover() != nil {
+			log.Print("recovered blinker")
+		}
+	}()
+	buf := make([]byte, 3)
+	rand.Read(buf)
+	defaultColor := image.NewUniform(color.RGBA{buf[0], buf[1], buf[2], 255})
+	rand.Read(buf)
+	blinkColor := image.NewUniform(color.RGBA{buf[0], buf[1], buf[2], 255})
+	redraw := func(r image.Rectangle, visible bool) func(draw.Image) image.Rectangle {
+		return func(drw draw.Image) image.Rectangle {
+			if r == image.ZR {
+				return r
+			}
+			if visible {
+				draw.Draw(drw, r, defaultColor, image.ZP, draw.Src)
+			} else {
+				draw.Draw(drw, r, blinkColor, image.ZP, draw.Src)
+			}
+			return r
+		}
+	}
+
+	var mu sync.Mutex
+	var (
+		r       image.Rectangle
+		visible bool = true
+	)
+
+	// first we draw a white rectangle
+	// env.Draw() <- redraw(b)
+	func() {
+		for event := range env.Events() {
+			switch event := event.(type) {
+			case win.MoDown:
+				if event.Point.In(r) {
+					go func() {
+						for i := 0; i < 6; i++ {
+							mu.Lock()
+							visible = !visible
+							env.Draw() <- redraw(r, visible)
+							mu.Unlock()
+
+							time.Sleep(time.Second / 3)
+						}
+					}()
+				}
+			case gui.Resize:
+				r = event.Rectangle
+				env.Draw() <- redraw(r, visible)
+			}
+		}
+	}()
+}