layout: add background color option

1 files changed, 28 insertions, 0 deletions

diff --git a/layout/layout.go b/layout/layout.go
new file mode 100644
index 0000000..b04aa35
--- /dev/null
+++ b/layout/layout.go
@@ -0,0 +1,28 @@
+/*
+Package layout provides means of partitioning screen space.
+
+A layout exists in a parent Env, and has one or more child Envs. It
+acts as a multiplexer for the children. The parent Env may be a window,
+another layout, or whatever... Several layers of layouts can be composed.
+
+A layout allocates screen area to its children by intercepting Resize
+events from the parent Env. Upon reception by the layout, a Resize event
+is transformed for each child, and forwarded to them.
+
+Draw calls from the children are intercepted and translated onto their
+respective areas before being forwarded to the parent Env.
+*/
+package layout
+
+import (
+	"image"
+	"image/color"
+	"image/draw"
+)
+
+func drawBackground(c color.Color) func(draw.Image) image.Rectangle {
+	return func(img draw.Image) image.Rectangle {
+		draw.Draw(img, img.Bounds(), &image.Uniform{c}, image.ZP, draw.Src)
+		return img.Bounds()
+	}
+}