From 3c25b58652b55ee27a8c3c1f09e88a1eb593ca39 Mon Sep 17 00:00:00 2001
From: Pietro Gagliardi <pietro10@mac.com>
Date: Sat, 15 Feb 2014 17:59:12 -0500
Subject: Added Listbox.Append() and Listbox.InsertBefore().

---
 listbox.go | 27 ++++++++++++++++++++++++++-
 main.go    | 12 +++++++-----
 2 files changed, 33 insertions(+), 6 deletions(-)

diff --git a/listbox.go b/listbox.go
index 20f1ffd..681c972 100644
--- a/listbox.go
+++ b/listbox.go
@@ -26,7 +26,32 @@ func NewListbox(multiple bool, items ...string) (l *Listbox) {
 	return l
 }
 
-// TODO Append, InsertBefore, Delete
+// Append adds an item to the end of the Listbox's list.
+func (l *Listbox) Append(what string) (err error) {
+	l.lock.Lock()
+	defer l.lock.Unlock()
+
+	if l.created {
+		return l.sysData.append(what)
+	}
+	l.initItems = append(l.initItems, what)
+	return nil
+}
+
+// InsertBefore inserts a new item in the Listbox before the item at the given position.
+func (l *Listbox) InsertBefore(what string, before int) (err error) {
+	l.lock.Lock()
+	defer l.lock.Unlock()
+
+	if l.created {
+		return l.sysData.insertBefore(what, before)
+	}
+	m := make([]string, 0, len(l.initItems) + 1)
+	m = append(m, l.initItems[:before]...)
+	m = append(m, what)
+	l.initItems = append(m, l.initItems[before:]...)
+	return nil
+}
 
 // TODO Selection
 
diff --git a/main.go b/main.go
index 3e87fd1..ce773ed 100644
--- a/main.go
+++ b/main.go
@@ -12,18 +12,20 @@ func main() {
 	c := NewCheckbox("Check Me")
 	cb1 := NewCombobox(true, "You can edit me!", "Yes you can!", "Yes you will!")
 	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, b, c, cb1, cb2, e, l)
+	lb := NewListbox(true, "Select One", "Or More", "To Continue")
+	lb2 := NewListbox(false, "Select", "Only", "One", "Please")
 	i := 0
 	doAdjustments := func() {
 		cb1.Append("append")
 		cb2.InsertBefore(fmt.Sprintf("before %d", i), 1)
+		lb.InsertBefore(fmt.Sprintf("%d", i), 2)
+		lb2.Append("Please")
 		i++
 	}
 	doAdjustments()
-	e := NewLineEdit("Enter text here too")
-	l := NewLabel("This is a label")
-	s0 := NewStack(Vertical, b, c, cb1, cb2, e, l)
-	lb := NewListbox(true, "Select One", "Or More", "To Continue")
-	lb2 := NewListbox(false, "Select", "Only", "One", "Please")
 	s1 := NewStack(Vertical, lb2, lb)
 	s := NewStack(Horizontal, s1, s0)
 	err := w.Open(s)
-- 
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