fix: a pressed ToggleButton draws its label in the accent ink

toggle.go

@@ -60,6 +60,9 @@ func (t *ToggleButton) Draw(p painter.Painter, theme *Theme) {
 		face = theme.SurfaceAlt
 	}
 	ink, border := theme.OnSurface, theme.Border
+	if t.Pressed().Get() {
+		ink = accentInk(theme) // the label on the accent face, not OnSurface (dark on dark in a light theme)
+	}
 	if t.Disabled().Get() {
 		face, ink, border = mutedFace(theme), mutedInk(theme), mutedInk(theme)
 	}

toggle_ink_test.go

@@ -0,0 +1,38 @@
+// Copyright (c) 2026 the go-widgets/toolkit authors. All rights reserved.
+// Use of this source code is governed by a BSD-3-Clause license that can be
+// found in the LICENSE file at the root of this repository.
+
+package toolkit
+
+import "testing"
+
+// A pressed ToggleButton's label sits on the accent face: it is drawn in the
+// accent ink, not OnSurface, which is dark on dark in a light theme.
+func TestPressedToggleLabelContrastsWithTheAccentFace(t *testing.T) {
+	for name, th := range popupThemes() {
+		tb := NewToggleButton("Minimap", true)
+		tb.SetBounds(Rect{W: 90, H: 28})
+		buf := makeSurface(90, 28)
+		tb.Draw(newP(buf, 90), th)
+		face := pixelAt(buf, 90, 3, 3)
+		if face != th.Accent {
+			t.Fatalf("%s: pressed face = %v, want Accent", name, face)
+		}
+		ink := accentInk(th)
+		found := false
+		for y := 0; y < 28 && !found; y++ {
+			for x := 0; x < 90; x++ {
+				if pixelAt(buf, 90, x, y) == ink {
+					found = true
+					break
+				}
+			}
+		}
+		if !found {
+			t.Errorf("%s: the label was not drawn in the accent ink %v", name, ink)
+		}
+		if r := contrastRatio(ink, th.Accent); r < 3 {
+			t.Errorf("%s: label vs accent face = %.2f:1, want >= 3:1", name, r)
+		}
+	}
+}