text: remove SingleLine from LayoutOptions

Low level text layout should not deal with filtering newlines.

Updates gio#61

Signed-off-by: Elias Naur <mail@eliasnaur.com>

font/opentype/opentype.go

@@ -81,12 +81,6 @@ func layoutText(buf *sfnt.Buffer, ppem fixed.Int26_6, str string, f *opentype, o
 	}
 	for prev.idx < len(str) {
 		c, s := utf8.DecodeRuneInString(str[prev.idx:])
-		nl := c == '\n'
-		if opts.SingleLine && nl {
-			nl = false
-			c = ' '
-			s = 1
-		}
 		a, ok := f.GlyphAdvance(buf, ppem, c)
 		if !ok {
 			prev.idx += s
@@ -99,7 +93,7 @@ func layoutText(buf *sfnt.Buffer, ppem fixed.Int26_6, str string, f *opentype, o
 			x:     prev.x + prev.adv,
 			valid: true,
 		}
-		if nl {
+		if c == '\n' {
 			// The newline is zero width; use the previous
 			// character for line measurements.
 			prev.advs = append(prev.advs, 0)

text/text.go

@@ -36,10 +36,8 @@ type Layout struct {
 
 // LayoutOptions specify the constraints of a text layout.
 type LayoutOptions struct {
-	// MaxWidth set the maximum width of the layout.
+	// MaxWidth is the available width of the layout.
 	MaxWidth int
-	// SingleLine specify that line breaks are ignored.
-	SingleLine bool
 }
 
 // Style is the font style.

widget/editor.go

@@ -5,6 +5,7 @@ package widget
 import (
 	"image"
 	"math"
+	"strings"
 	"time"
 	"unicode/utf8"
 
@@ -399,7 +400,7 @@ func (e *Editor) moveCoord(c unit.Converter, pos image.Point) {
 
 func (e *Editor) layoutText(c unit.Converter, s *text.Shaper, font text.Font) ([]text.Line, layout.Dimensions) {
 	txt := e.rr.String()
-	opts := text.LayoutOptions{SingleLine: e.SingleLine, MaxWidth: e.maxWidth}
+	opts := text.LayoutOptions{MaxWidth: e.maxWidth}
 	textLayout := s.Layout(c, font, txt, opts)
 	lines := textLayout.Lines
 	dims := linesDimens(lines)
@@ -463,8 +464,8 @@ func (e *Editor) deleteRuneForward() {
 }
 
 func (e *Editor) append(s string) {
-	if e.SingleLine && s == "\n" {
-		return
+	if e.SingleLine {
+		s = strings.ReplaceAll(s, "\n", "")
 	}
 	e.prepend(s)
 	e.rr.caret += len(s)