Changed Combobox.Append() and Listbox.Append() to accept multiple strings in one call.

combobox.go

@@ -2,6 +2,7 @@
 package ui
 
 import (
+	"fmt"
 	"sync"
 )
 
@@ -34,15 +35,21 @@ func NewEditableCombobox(items ...string) *Combobox {
 	return newCombobox(true, items...)
 }
 
-// Append adds an item to the end of the Combobox's list.
-func (c *Combobox) Append(what string) (err error) {
+// Append adds items to the end of the Combobox's list.
+func (c *Combobox) Append(what ...string) (err error) {
 	c.lock.Lock()
 	defer c.lock.Unlock()
 
 	if c.created {
-		return c.sysData.append(what)
+		for i, s := range what {
+			err := c.sysData.append(s)
+			if err != nil {
+				return fmt.Errorf("error adding element %d in Combobox.Append() (%q): %v", i, s, err)
+			}
+		}
+		return nil
 	}
-	c.initItems = append(c.initItems, what)
+	c.initItems = append(c.initItems, what...)
 	return nil
 }
 

listbox.go

@@ -2,6 +2,7 @@
 package ui
 
 import (
+	"fmt"
 	"sync"
 )
 
@@ -25,15 +26,21 @@ func NewListbox(multiple bool, items ...string) (l *Listbox) {
 	return l
 }
 
-// Append adds an item to the end of the Listbox's list.
-func (l *Listbox) Append(what string) (err error) {
+// Append adds items 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)
+		for i, s := range what {
+			err := l.sysData.append(s)
+			if err != nil {
+				return fmt.Errorf("error adding element %d in Listbox.Append() (%q): %v", i, s, err)
+			}
+		}
+		return nil
 	}
-	l.initItems = append(l.initItems, what)
+	l.initItems = append(l.initItems, what...)
 	return nil
 }
 

test/main.go

@@ -69,6 +69,8 @@ func myMain() {
 		i++
 	}
 	doAdjustments()
+	cb1.Append("append multi 1", "append multi 2")
+	lb2.Append("append multi 1", "append multi 2")
 	s1 := NewVerticalStack(lb2, lb1)
 	s1.SetStretchy(0)
 	s1.SetStretchy(1)
@@ -126,6 +128,8 @@ mainloop:
 				prog = 100
 			}
 			pbar.SetProgress(prog)
+			cb1.Append("append multi 1", "append multi 2")
+			lb2.Append("append multi 1", "append multi 2")
 		case <-decButton.Clicked:
 			prog--
 			if prog < 0 {