1 files changed, 76 insertions, 0 deletions
diff --git a/test/region.go b/test/region.go
new file mode 100644
index 0000000..afd739e
--- /dev/null
+++ b/test/region.go
@@ -0,0 +1,76 @@
+package main
+
+import (
+	"image"
+	"image/draw"
+	"time"
+
+	"github.com/faiface/gui"
+	"github.com/faiface/gui/layout"
+	"github.com/faiface/gui/win"
+	"github.com/faiface/mainthread"
+)
+
+func main() {
+	mainthread.Run(run)
+}
+
+func run() {
+	w, err := win.New(win.Title("Grid Layout Test"), win.Resizable())
+	if err != nil {
+		panic(err)
+	}
+
+	mux, env := gui.NewMux(w)
+
+	// Create region in bottom-right quadrant of window
+	region := layout.NewRegion(mux.MakeEnv(), func(r image.Rectangle) image.Rectangle {
+		return image.Rect(r.Min.X+r.Dx()/2, r.Min.Y+r.Dy()/2, r.Max.X, r.Max.Y)
+	})
+	go blinker(region)
+
+	for event := range env.Events() {
+		switch event.(type) {
+		case win.WiClose:
+			close(env.Draw())
+			return
+		}
+	}
+}
+
+// Blinker is a widget that blinks three times when it is clicked.
+func blinker(env gui.Env) {
+	redraw := func(visible bool) func(draw.Image) image.Rectangle {
+		return func(img draw.Image) image.Rectangle {
+			if visible {
+				draw.Draw(img, img.Bounds(), image.White, image.ZP, draw.Src)
+			} else {
+				draw.Draw(img, img.Bounds(), image.Black, image.ZP, draw.Src)
+			}
+			return img.Bounds()
+		}
+	}
+
+	area := (<-env.Events()).(gui.Resize).Rectangle // first event guaranteed to be Resize
+	env.Draw() <- redraw(true)
+
+	for event := range env.Events() {
+		switch event := event.(type) {
+		case gui.Resize:
+			area = event.Rectangle
+			env.Draw() <- redraw(true)
+		case win.MoDown:
+			if event.Point.In(area) {
+				go func() {
+					for i := 0; i < 3; i++ {
+						env.Draw() <- redraw(false)
+						time.Sleep(time.Second / 3)
+						env.Draw() <- redraw(true)
+						time.Sleep(time.Second / 3)
+					}
+				}()
+			}
+		}
+	}
+	close(env.Draw())
+}