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basic frame rendering

--- a/readline_plan9.go

+++ b/readline_plan9.go

@@ -6,6 +6,7 @@

 	"io"

 	"os"

 	"strings"

+	"image"

     "codeberg.org/penny64/go/draw"

 	"codeberg.org/penny64/go/draw/frame"

@@ -42,8 +43,37 @@

 	if err != nil {

 		return nil, err

 	}

+

+	var maincols [frame.NCOL]*draw.Image

+	/* Main text is yellowish */

+	screen := window.ScreenImage

+	maincols[frame.BACK] = window.AllocImageMix(draw.PaleYellow, draw.White)

+	maincols[frame.HIGH], _ = window.AllocImage(image.Rect(0, 0, 1, 1), screen.Pix, true, draw.DarkYellow)

+	maincols[frame.BORD], _ = window.AllocImage(image.Rect(0, 0, 2, 2), screen.Pix, true, draw.YellowGreen)

+	maincols[frame.TEXT] = window.Black

+	maincols[frame.HTEXT] = window.Black

+

+	const (

+		ScrollbarWidth = 12

+		BorderWidth    = 2

+	)

+	fullRect := window.ScreenImage.R

+	window.ScreenImage.Draw(fullRect, maincols[frame.BACK], nil, draw.ZP)

+	scrollRect := fullRect

+	scrollRect.Max.X = scrollRect.Min.X + ScrollbarWidth

+	textRect := fullRect

+	textRect.Min.X = scrollRect.Max.X

+	window.ScreenImage.Border(textRect, BorderWidth, maincols[frame.BORD], draw.ZP)

+	frameRect := textRect.Inset(BorderWidth)

 	f := &frame.Frame{}

-	f.Init(window.Image.R, window.Font, window.Image, nil)

+	f.Init(frameRect, window.Font, window.ScreenImage, maincols[:])

+	f.Insert([]rune("Hello, Frame!"), 0)

+	f.Display = window

+	f.InitTick()

+	f.Tick(f.PointOf(f.NumChars), true)

+	window.ScreenImage.Draw(scrollRect, maincols[frame.TEXT], nil, draw.ZP)

+

+	window.Flush()

 	label, err := os.OpenFile("/dev/label", os.O_WRONLY, 0)

 	return &readline{config: *config, ctl: nil, label: label}, nil

 }

-- 

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