Same as three commits ago, but for the GTK+ backend.

redo/container_unix.go

@@ -20,6 +20,16 @@ type container struct {
 	layout			*C.GtkLayout
 }
 
+type sizing struct {
+	sizingbase
+
+	// for size calculations
+	// gtk+ needs nothing
+
+	// for the actual resizing
+	shouldVAlignTop	bool
+}
+
 func newContainer(child Control) *container {
 	widget := C.gtk_layout_new(nil, nil)
 	c := &container{
@@ -41,6 +51,10 @@ func newContainer(child Control) *container {
 	return c
 }
 
+func (c *container) setParent(p *controlParent) {
+	C.gtk_container_add(p.c, c.layoutwidget)
+}
+
 //export containerResizing
 func containerResizing(wid *C.GtkWidget, r *C.GdkRectangle, data C.gpointer) {
 	c := (*container)(unsafe.Pointer(data))
@@ -49,16 +63,6 @@ func containerResizing(wid *C.GtkWidget, r *C.GdkRectangle, data C.gpointer) {
 fmt.Printf("new size %d x %d\n", r.width, r.height)
 }
 
-type sizing struct {
-	sizingbase
-
-	// for size calculations
-	// gtk+ needs nothing
-
-	// for the actual resizing
-	shouldVAlignTop	bool
-}
-
 const (
 	gtkXMargin = 12
 	gtkYMargin = 12

redo/tab_unix.go

@@ -13,6 +13,7 @@ import "C"
 
 type tab struct {
 	_widget		*C.GtkWidget
+	container		*C.GtkContainer
 	notebook		*C.GtkNotebook
 
 	tabs			[]*container
@@ -22,6 +23,7 @@ func newTab() Tab {
 	widget := C.gtk_notebook_new()
 	t := &tab{
 		_widget:		widget,
+		container:		(*C.GtkContainer)(unsafe.Pointer(widget)),
 		notebook:		(*C.GtkNotebook)(unsafe.Pointer(widget)),
 	}
 	// there are no scrolling arrows by default; add them in case there are too many tabs
@@ -32,15 +34,14 @@ func newTab() Tab {
 func (t *tab) Append(name string, control Control) {
 	c := newContainer(control)
 	t.tabs = append(t.tabs, c)
+	// this calls gtk_container_add(), which, according to gregier in irc.gimp.net/#gtk+, acts just like gtk_notebook_append_page()
+	c.setParent(&controlParent{t.container})
 	cname := togstr(name)
 	defer freegstr(cname)
-	tab := C.gtk_notebook_append_page(t.notebook,
-		// TODO figure out how to keep this private
-		c.layoutwidget,
-		C.gtk_label_new(cname))
-	if tab == -1 {
-		panic("gtk_notebook_append_page() failed")
-	}
+	C.gtk_notebook_set_tab_label_text(t.notebook,
+		// unfortunately there does not seem to be a gtk_notebook_set_nth_tab_label_text()
+		C.gtk_notebook_get_nth_page(t.notebook, C.gint(len(t.tabs) - 1)),
+		cname)
 }
 
 func (t *tab) widget() *C.GtkWidget {

redo/window_unix.go

@@ -42,8 +42,7 @@ func newWindow(title string, width int, height int, control Control) *window {
 		C.gpointer(unsafe.Pointer(w)))
 	C.gtk_window_resize(w.window, C.gint(width), C.gint(height))
 	w.container = newContainer(control)
-	// TODO make a method of container? because this would conflict with tabs...
-	C.gtk_container_add(w.wc, w.container.layoutwidget)
+	w.container.setParent(&controlParent{w.wc})
 	return w
 }