move image widget to separate file

1 files changed, 38 insertions, 0 deletions

diff --git a/gui/widget/image.go b/gui/widget/image.go
new file mode 100644
index 0000000..c5712c4
--- /dev/null
+++ b/gui/widget/image.go
@@ -0,0 +1,38 @@
+package widget
+
+import (
+	"sync"
+
+	"image"
+	"image/draw"
+
+	"volute/gui"
+	"volute/gui/win"
+)
+
+func Image(imChan <-chan image.Image, r image.Rectangle, env gui.Env, wg *sync.WaitGroup) {
+	defer wg.Done()
+	defer close(env.Draw())
+
+	var im image.Image = image.NewGray(r)
+	for {
+		select {
+		case im = <-imChan:
+			env.Draw() <- imageDraw(im, r)
+		case event, ok := <-env.Events():
+			if !ok {
+				return
+			}
+			if event, ok := event.(win.WiFocus); ok && event.Focused {
+				env.Draw() <- imageDraw(im, r)
+			}
+		}
+	}
+}
+
+func imageDraw(im image.Image, r image.Rectangle) func(draw.Image) image.Rectangle {
+	return func(drw draw.Image) image.Rectangle {
+		interpolator.Scale(drw, r, im, im.Bounds(), draw.Src, nil)
+		return r
+	}
+}