4 files changed, 11 insertions, 8 deletions
diff --git a/gui/widget/input.go b/gui/widget/input.go
index f47f587..1e15da9 100644
--- a/gui/widget/input.go
+++ b/gui/widget/input.go
@@ -1,7 +1,6 @@
 package widget
 
 import (
-	"fmt"
 	"image"
 	"image/draw"
 	"sync"
@@ -16,7 +15,7 @@ func Input(val chan<- uint, r image.Rectangle, focus FocusSlave, env gui.Env, wg
 	defer close(env.Draw())
 	defer close(val)
 
-	text := []byte{'0'}
+	text := "0"
 	focused := false
 	env.Draw() <- inputDraw(text, focused, r)
 Loop:
@@ -46,7 +45,7 @@ Loop:
 				}
 			case win.KbType:
 				if focused && isDigit(event.Rune) {
-					text = fmt.Appendf(text, "%c", event.Rune)
+					text = text + string(event.Rune)
 					env.Draw() <- inputDraw(text, focused, r)
 					val <- atoi(text)
 				}
@@ -61,7 +60,7 @@ Loop:
 	}
 }
 
-func inputDraw(str []byte, focused bool, r image.Rectangle) func(draw.Image) image.Rectangle {
+func inputDraw(str string, focused bool, r image.Rectangle) func(draw.Image) image.Rectangle {
 	return func(drw draw.Image) image.Rectangle {
 		if focused {
 			text.Draw(str, drw, r, GREEN, FOCUS_COLOR, text.ALIGN_RIGHT)
@@ -76,7 +75,7 @@ func isDigit(r rune) bool {
 	return '0' <= r && r <= '9'
 }
 
-func atoi(s []byte) uint {
+func atoi(s string) uint {
 	var n uint = 0
 	for _, d := range s {
 		n = n*10 + uint(d-'0')
diff --git a/gui/widget/label.go b/gui/widget/label.go
index fe451f8..7a583bc 100644
--- a/gui/widget/label.go
+++ b/gui/widget/label.go
@@ -15,7 +15,7 @@ func Label(str string, r image.Rectangle, env gui.Env, wg *sync.WaitGroup) {
 	defer close(env.Draw())
 
 	redraw := func(drw draw.Image) image.Rectangle {
-		text.Draw([]byte(str), drw, r, BLACK, WHITE, text.ALIGN_LEFT)
+		text.Draw(str, drw, r, BLACK, WHITE, text.ALIGN_LEFT)
 		return r
 	}
 
diff --git a/gui/widget/output.go b/gui/widget/output.go
index ecca18c..16aacca 100644
--- a/gui/widget/output.go
+++ b/gui/widget/output.go
@@ -35,7 +35,7 @@ Loop:
 
 func outputDraw(v float64, r image.Rectangle) func(draw.Image) image.Rectangle {
 	return func(drw draw.Image) image.Rectangle {
-		text.Draw([]byte(fmt.Sprintf("%.3f", v)), drw, r, BLACK, WHITE, text.ALIGN_RIGHT)
+		text.Draw(fmt.Sprintf("%.3f", v), drw, r, BLACK, WHITE, text.ALIGN_RIGHT)
 		return r
 	}
 }
diff --git a/gui/widget/tree.go b/gui/widget/tree.go
index 14d7b9d..633d440 100644
--- a/gui/widget/tree.go
+++ b/gui/widget/tree.go
@@ -9,6 +9,8 @@ import (
 	"volute/gui/layout"
 )
 
+const INDENT = 2
+
 type Node[T any] struct {
 	Label    string
 	Value    T
@@ -50,7 +52,9 @@ func Tree[T any](trees []Node[T], r image.Rectangle, focus FocusSlave, mux *gui.
 }
 
 func flatten[T any](root Node[T], depth int) []string {
-	indent := string(populate(make([]byte, 2*depth), ' '))
+	indent := string(populate(
+		make([]rune, INDENT*depth),
+		'─'))
 	nodes := []string{indent + root.Label}
 	root.expanded = true // TODO: remove me
 	if root.expanded {