gtk: host NativeList via GtkListBox

go.mod

@@ -13,7 +13,7 @@ require (
 )
 
 require (
-	github.com/go-gtk/gtk4 v0.5.0
+	github.com/go-gtk/gtk4 v0.6.0
 	github.com/go-macos/virtualdisplay v0.3.0
 )
 

go.sum

@@ -20,6 +20,8 @@ github.com/go-gfx/gfx v0.19.0 h1:nA2Eg8Aq2kytR5Hrm/eQ6618w4vT0+Ao8BMZiuYh84c=
 github.com/go-gfx/gfx v0.19.0/go.mod h1:VAK6hgCgkhT3j3ek2K7G8zDfkCPD3RCF45UbcRlCV8Q=
 github.com/go-gtk/gtk4 v0.5.0 h1:97/WDULZ3cVIYldSIPT9FV7GBkEf4cOMunF7nsIODNk=
 github.com/go-gtk/gtk4 v0.5.0/go.mod h1:jjaA29sFQTpy2D3N+FrnxMFZq07mG48ahgQoEEECpPA=
+github.com/go-gtk/gtk4 v0.6.0 h1:piXUsvHo1FWJtgEz5ogowyvXlMskchAbiryeNJPKEmw=
+github.com/go-gtk/gtk4 v0.6.0/go.mod h1:jjaA29sFQTpy2D3N+FrnxMFZq07mG48ahgQoEEECpPA=
 github.com/go-icons/iconoir v0.2.0 h1:I5AnDEIPgYfawTmwzemDRJjlYCUbFHuS8GJXrjADhXc=
 github.com/go-icons/iconoir v0.2.0/go.mod h1:Td/M2vy4xdVv4aOudAskV0nXR9Wv0MlhWvyRIzPBz5U=
 github.com/go-images/images v0.0.0-20260831115433-23d959d868e3 h1:SinmtXWpA4a30ZQ5A9QI9YrsYvytmLGeTRVbXqqEezw=

internal/gtk/gtk_live_linux_test.go

@@ -165,3 +165,30 @@ func TestGTKBackendMoreWidgets(t *testing.T) {
 		t.Error("segmented: the \"two\" segment should be active")
 	}
 }
+
+// TestGTKBackendList proves NativeList builds a GtkListBox whose rows are the
+// Items and whose selection follows Number.
+func TestGTKBackendList(t *testing.T) {
+	win, err := Open("gtk list test", 320, 240, nil, 1)
+	if err != nil {
+		t.Skipf("no GTK display: %v", err)
+	}
+	defer win.Close()
+	surf := toolkit.NewSurface(func() ([]byte, int, int) { return make([]byte, 320*240*4), 320, 240 })
+	surf.Controls = func() []toolkit.NativeControl {
+		return []toolkit.NativeControl{{
+			Kind: toolkit.NativeList, Key: "lst", Visible: true,
+			Rect:  toolkit.Rect{X: 10, Y: 10, W: 200, H: 160},
+			Items: []string{"red", "green", "blue"}, Number: 2, OnNumber: func(float64) {},
+		}}
+	}
+	win.root = surf
+	win.frame()
+	lc := win.native["lst"]
+	if lc == nil {
+		t.Fatal("no list control created")
+	}
+	if got := lc.widget.SelectedRow(); got != 2 {
+		t.Errorf("selected row = %d, want 2 (blue)", got)
+	}
+}

internal/gtk/native_linux.go

@@ -162,6 +162,14 @@ func (w *Window) applySpec(lc *liveControl, spec toolkit.NativeControl) {
 			lc.widget.SetColorHex(spec.Text)
 			lc.lastText = spec.Text
 		}
+	case toolkit.NativeList:
+		// Push the selected row when the app moved it. (Changing the row STRINGS
+		// after creation needs a new Key so the control is rebuilt — GtkListBox has
+		// no clear-all in the binding; the reconcile handles that path.)
+		if spec.Number != lc.lastNum {
+			lc.widget.SelectRow(int(spec.Number))
+			lc.lastNum = spec.Number
+		}
 	}
 
 	w.fixed.Move(lc.widget, w.pt(spec.Rect.X), w.pt(spec.Rect.Y))
@@ -319,6 +327,26 @@ func (w *Window) makeControl(spec toolkit.NativeControl) *liveControl {
 				lc.onText(lc.lastText)
 			}
 		})
+	case toolkit.NativeList:
+		// A single-column selectable list (the GTK peer of cocoa's NSTableView).
+		// Items are the rows, Number the selected index, reported via OnNumber.
+		lc.items = spec.Items
+		lb := gtk4.ListBoxNew()
+		for _, it := range spec.Items {
+			lb.ListBoxAppendText(it)
+		}
+		if i := int(spec.Number); i >= 0 && i < len(spec.Items) {
+			lb.SelectRow(i)
+		}
+		lb.Connect("row-selected", func() {
+			if i := lb.SelectedRow(); i >= 0 {
+				lc.lastNum = float64(i)
+				if lc.onNumber != nil {
+					lc.onNumber(lc.lastNum)
+				}
+			}
+		})
+		lc.widget = lb
 	case toolkit.NativeSegmented:
 		// GTK has no segmented control; compose one from linked toggle buttons in a
 		// horizontal box (the go-gtk primitives). The selected segment's title is the