Added Combobox.SelectedIndex().

combobox.go

@@ -76,7 +76,16 @@ func (c *Combobox) Selection() string {
 	return ""
 }
 
-// TODO SelectedIndex
+// SelectedIndex returns the index of the current selection in the Combobox. It returns -1 either if no selection was made or if text was manually entered in an editable Combobox.
+func (c *Combobox) SelectedIndex() int {
+	c.lock.Lock()
+	defer c.lock.Unlock()
+
+	if c.created {
+		return c.sysData.selectedIndex()
+	}
+	return -1
+}
 
 func (c *Combobox) make(window *sysData) (err error) {
 	c.lock.Lock()

main.go

@@ -16,7 +16,9 @@ func main() {
 	cb2 := NewCombobox(false, "You can't edit me!", "No you can't!", "No you won't!")
 	e := NewLineEdit("Enter text here too")
 	l := NewLabel("This is a label")
-	s0 := NewStack(Vertical, s2, c, cb1, cb2, e, l)
+	b3 := NewButton("List Info")
+	s3 := NewStack(Horizontal, l, b3)
+	s0 := NewStack(Vertical, s2, c, cb1, cb2, e, s3)
 	lb := NewListbox(true, "Select One", "Or More", "To Continue")
 	lb2 := NewListbox(false, "Select", "Only", "One", "Please")
 	i := 0
@@ -55,6 +57,11 @@ mainloop:
 			cb2.Delete(2)
 			lb.Delete(3)
 			lb2.Delete(4)
+		case <-b3.Clicked:
+			MsgBox("List Info",
+				"cb1: %d %q\ncb2: %d %q",
+				cb1.SelectedIndex(), cb1.Selection(),
+				cb2.SelectedIndex(), cb2.Selection())
 		}
 	}
 	w.Hide()

sysdata_windows.go

@@ -340,7 +340,6 @@ func (s *sysData) insertBefore(what string, index int) (err error) {
 	return nil
 }
 
-// TODO differentiate between nothing selected and custom text entered for a Combobox
 func (s *sysData) selectedIndex() int {
 	ret := make(chan uiret)
 	defer close(ret)
@@ -355,7 +354,7 @@ func (s *sysData) selectedIndex() int {
 		ret:		ret,
 	}
 	r := <-ret
-	if r.ret == uintptr(classTypes[s.ctype].selectedIndexErr) {		// no selection
+	if r.ret == uintptr(classTypes[s.ctype].selectedIndexErr) {		// no selection or manually entered text (apparently, for the latter)
 		return -1
 	}
 	return int(r.ret)