Added uiCombobox.

checkbox.go

@@ -48,7 +48,7 @@ func (c *Checkbox) Destroy() {
 	C.uiControlDestroy(c.co)
 }
 
-// LibuiControl returns the libui uiControl pointer that c.coks
+// LibuiControl returns the libui uiControl pointer that backs
 // the Window. This is only used by package ui itself and should
 // not be called by programs.
 func (c *Checkbox) LibuiControl() uintptr {

combobox.go

@@ -0,0 +1,132 @@
+// 12 december 2015
+
+package ui
+
+import (
+	"unsafe"
+)
+
+// #include "ui.h"
+// extern void doComboboxOnSelected(uiCombobox *, void *);
+// static inline void realuiComboboxOnSelected(uiCombobox *c)
+// {
+// 	uiComboboxOnSelected(c, doComboboxOnSelected, NULL);
+// }
+import "C"
+
+// no need to lock this; only the GUI thread can access it
+var comboboxes = make(map[*C.uiCombobox]*Combobox)
+
+// Combobox is a Control that represents a drop-down list of strings
+// that the user can choose one of at any time. An editable
+// Combobox also has an entry field that the user can type an alternate
+// choice into.
+type Combobox struct {
+	co	*C.uiControl
+	c	*C.uiCombobox
+
+	onSelected		func(*Combobox)
+}
+
+// NewCombobox creates a new Combobox.
+// This Combobox is not editable.
+func NewCombobox() *Combobox {
+	c := new(Combobox)
+
+	c.c = C.uiNewCombobox()
+	c.co = (*C.uiControl)(unsafe.Pointer(c.c))
+
+	C.realuiComboboxOnSelected(c.c)
+	comboboxes[c.c] = c
+
+	return c
+}
+
+// NewEditableCombobox creates a new editable Combobox.
+func NewEditableCombobox() *Combobox {
+	c := new(Combobox)
+
+	c.c = C.uiNewEditableCombobox()
+	c.co = (*C.uiControl)(unsafe.Pointer(c.c))
+
+	C.realuiComboboxOnSelected(c.c)
+	comboboxes[c.c] = c
+
+	return c
+}
+
+// Destroy destroys the Combobox.
+func (c *Combobox) Destroy() {
+	delete(comboboxes, c.c)
+	C.uiControlDestroy(c.co)
+}
+
+// LibuiControl returns the libui uiControl pointer that backs
+// the Window. This is only used by package ui itself and should
+// not be called by programs.
+func (c *Combobox) LibuiControl() uintptr {
+	return uintptr(unsafe.Pointer(c.co))
+}
+
+// Handle returns the OS-level handle associated with this Combobox.
+// On Windows this is an HWND of a standard Windows API COMBOBOX
+// class (as provided by Common Controls version 6).
+// On GTK+ this is a pointer to a GtkComboBoxText.
+// On OS X this is a pointer to a NSComboBox for editable Comboboxes
+// and to a NSPopUpButton for noneditable Comboboxes.
+func (c *Combobox) Handle() uintptr {
+	return uintptr(C.uiControlHandle(c.co))
+}
+
+// Show shows the Combobox.
+func (c *Combobox) Show() {
+	C.uiControlShow(c.co)
+}
+
+// Hide hides the Combobox.
+func (c *Combobox) Hide() {
+	C.uiControlHide(c.co)
+}
+
+// Enable enables the Combobox.
+func (c *Combobox) Enable() {
+	C.uiControlEnable(c.co)
+}
+
+// Disable disables the Combobox.
+func (c *Combobox) Disable() {
+	C.uiControlDisable(c.co)
+}
+
+// Append adds the named item to the end of the Combobox.
+func (c *Combobox) Append(text string) {
+	ctext := C.CString(text)
+	C.uiComboboxAppend(c.c, ctext)
+	freestr(ctext)
+}
+
+// Selected returns the index of the currently selected item in the
+// Combobox, or -1 if nothing is selected.
+func (c *Combobox) Selected() int {
+	return int(C.uiComboboxSelected(c.c))
+}
+
+// SetChecked sets the currently select item in the Combobox
+// to index. If index is -1 no item will be selected.
+func (c *Combobox) SetSelected(index int) {
+	C.uiComboboxSetSelected(c.c, C.intmax_t(index))
+}
+
+// OnSelected registers f to be run when the user selects an item in
+// the Combobox. Only one function can be registered at a time.
+func (c *Combobox) OnSelected(f func(*Combobox)) {
+	c.onSelected = f
+}
+
+//export doComboboxOnSelected
+func doComboboxOnSelected(cc *C.uiCombobox, data unsafe.Pointer) {
+	c := comboboxes[cc]
+	if c.onSelected != nil {
+		c.onSelected(c)
+	}
+}

zz_test.go

@@ -11,10 +11,9 @@ func TestIt(t *testing.T) {
 			Quit()
 			return true
 		})
-		c := NewCheckbox("Click Me")
-		c.OnToggled(func(c *Checkbox) {
-			w.SetMargined(c.Checked())
-		})
+		c := NewEditableCombobox()
+		c.Append("Item 1")
+		c.Append("Item 2")
 		w.SetChild(c)
 		w.Show()
 	})