Cleanups and comments.

cmd/hello/main.go

@@ -3,6 +3,7 @@ package main
 import (
 	"git.wow.st/gmp/giowrap"
 
+	"image/color"
 	"log"
 	"time"
 
@@ -40,7 +41,7 @@ func main() {
 			"push",
 			text.Center,
 		)
-		bg := giowrap.NewBackground(giowrap.Rgb(0x3c98c6), ui.Dp(4))
+		bg := giowrap.NewBackground(color.RGBA{A: 0xff, R: 0x3c, G: 0x98, B: 0xc6}, ui.Dp(4))
 		btn := giowrap.Clickable(bg(lbl))
 
 		for {
@@ -53,15 +54,14 @@ func main() {
 					return
 				case app.DrawEvent:
 					ctx = ctx.Reset(e)
-					ctx = giowrap.LayoutWithContext(ctx,
-						OuterInset(
+					ctx = OuterInset(
 						    f(
 							e1,
 							giowrap.Flexible(5),
 							InnerInset(e2),
 							giowrap.Flexible(10),
 							btn,
-						)))
+						)).Layout(ctx)
 					ctx.Draw()
 					if btn.Clicked(ctx) {
 						log.Print("Clicked: " + e2.Text() )

main.go

@@ -52,25 +52,6 @@ func (ctx Context) Draw() {
 
 type Layout func(Context) Context
 
-func LayoutWithContext(ctx Context, ws ...Widget) Context {
-	for _, w := range ws {
-		ctx = w.Layout(ctx)
-	}
-	return ctx
-}
-
-type fWidget struct {
-	l Layout
-}
-
-func NewfWidget(l Layout) fWidget {
-	return fWidget{ l: l }
-}
-
-func (fw fWidget) Layout(ctx Context) Context {
-	return fw.l(ctx)
-}
-
 type Widget interface {
 	Layout(Context) Context
 }
@@ -111,28 +92,25 @@ func (e *Editor) Layout(ctx Context) Context {
 	return ctx
 }
 
-func (e *Editor) Text() string {
-	return e.e.Text()
+func (e *Editor) Text() string { return e.e.Text() }
+func (e *Editor) SetText(s string) { e.e.SetText(s) }
+func (e *Editor) Focus() { e.e.Focus() }
+
+type fWidget struct {
+	l Layout
 }
 
-func (e *Editor) SetText(s string) {
-	e.e.SetText(s)
+func NewfWidget(l Layout) fWidget {
+	return fWidget{ l: l }
 }
 
-func (e *Editor) Focus() {
-	e.e.Focus()
-}
-
-func Rgb(c uint32) color.RGBA {
-	return Argb((0xff << 24) | c)
-}
-
-func Argb(c uint32) color.RGBA {
-	return color.RGBA{A: uint8(c >> 24), R: uint8(c >> 16), G: uint8(c >> 8), B: uint8(c)}
+func (fw fWidget) Layout(ctx Context) Context {
+	return fw.l(ctx)
 }
 
 type Flex WidgetCombinator
 
+// This "Widget" does nothing except set the Flexible key of ctx.extra.
 func Flexible(v float32) Widget {
 	return NewfWidget(func(ctx Context) Context {
 		ctx.extra["Flexible"] = v
@@ -140,6 +118,7 @@ func Flexible(v float32) Widget {
 	})
 }
 
+// NewFlex returns a WidgetCombinator that wraps the layout.Flex element.
 func NewFlex(axis layout.Axis, mainAxisAlignment layout.MainAxisAlignment, crossAxisAlignment layout.CrossAxisAlignment) Flex {
 	f := layout.Flex{
 		Axis: axis,
@@ -171,6 +150,7 @@ func NewFlex(axis layout.Axis, mainAxisAlignment layout.MainAxisAlignment, cross
 	}
 }
 
+//NewInset returns a WidgetCombinator that wraps the layout.Inset element.
 func NewInset(top, right, bottom, left ui.Value) WidgetCombinator {
 	ins := layout.Inset{ Top: top, Right: right, Bottom: bottom, Left: left }
 	return func(ws ...Widget) Widget {
@@ -264,6 +244,7 @@ func rrect(ops *ui.Ops, width, height, se, sw, nw, ne float32) {
 	b.End()
 }
 
+//cWidget is a clickable Widget that provides the Clicked() method.
 type cWidget struct {
 	w Widget
 	click *gesture.Click
@@ -285,6 +266,7 @@ func (w cWidget) Clicked(ctx Context) bool {
 	return false
 }
 
+//Clickable converts any Widget into a clickable Widget.
 func Clickable(w Widget) cWidget {
 	return cWidget{ w: w, click: new(gesture.Click) }
 }