Added Checkbox on the GTK+ backend, added a checkbox to the test program, and fixed a small error in the GTK+ widgetbase.parent() that kept the new widget hidden.

redo/common_unix.go

@@ -32,6 +32,17 @@ func freegstr(s *C.gchar) {
 	C.free(unsafe.Pointer(s))
 }
 
+func fromgbool(b C.gboolean) bool {
+	return b != C.FALSE
+}
+
+func togbool(b bool) C.gboolean {
+	if b == true {
+		return C.TRUE
+	}
+	return C.FALSE
+}
+
 func g_signal_connect(object C.gpointer, name string, to C.GCallback, data C.gpointer) {
 	cname := togstr(name)
 	defer freegstr(cname)

redo/controls.go

@@ -34,7 +34,7 @@ type Checkbox interface {
 	Control
 
 	// OnClicked sets the event handler for when the Checkbox is clicked (to change its toggle state).
-	// TODO change to OnCheckChanged or OnToggled?
+	// TODO change to OnToggled() or OnChecked()?
 	OnClicked(func())
 
 	// Text and SetText are Requests that get and set the Checkbox's label text.
@@ -49,7 +49,5 @@ type Checkbox interface {
 // NewCheckbox creates a new Checkbox with the given label text.
 // The Checkbox will be initially unchecked.
 func NewCheckbox(text string) Checkbox {
-//	return newCheckbox(text)
-return nil
-//TODO add checkbox after resolving other TODOs
+	return newCheckbox(text)
 }

redo/controls_unix.go

@@ -10,6 +10,7 @@ import (
 
 // #include "gtk_unix.h"
 // extern void buttonClicked(GtkButton *, gpointer);
+// extern void checkboxToggled(GtkToggleButton *, gpointer);
 import "C"
 
 type widgetbase struct {
@@ -45,6 +46,8 @@ func (w *widgetbase) parent(win *window) {
 		C.g_object_unref(C.gpointer(unsafe.Pointer(w.widget)))
 		w.floating = false
 	}
+	// make sure the new widget is shown
+	C.gtk_widget_show_all(w.widget)
 }
 
 type button struct {
@@ -53,10 +56,8 @@ type button struct {
 	clicked		*event
 }
 
-func newButton(text string) *button {
-	ctext := togstr(text)
-	defer freegstr(ctext)
-	widget := C.gtk_button_new_with_label(ctext)
+// shared code for setting up buttons, check boxes, etc.
+func finishNewButton(widget *C.GtkWidget, event string, handler unsafe.Pointer) *button {
 	b := &button{
 		widgetbase:	newWidget(widget),
 		button:		(*C.GtkButton)(unsafe.Pointer(widget)),
@@ -64,12 +65,19 @@ func newButton(text string) *button {
 	}
 	g_signal_connect(
 		C.gpointer(unsafe.Pointer(b.button)),
-		"clicked",
-		C.GCallback(C.buttonClicked),
+		event,
+		C.GCallback(handler),
 		C.gpointer(unsafe.Pointer(b)))
 	return b
 }
 
+func newButton(text string) *button {
+	ctext := togstr(text)
+	defer freegstr(ctext)
+	widget := C.gtk_button_new_with_label(ctext)
+	return finishNewButton(widget, "clicked", C.buttonClicked)
+}
+
 func (b *button) OnClicked(e func()) {
 	b.clicked.set(e)
 }
@@ -90,3 +98,36 @@ func (b *button) SetText(text string) {
 	defer freegstr(ctext)
 	C.gtk_button_set_label(b.button, ctext)
 }
+
+type checkbox struct {
+	// embed button so its methods and events carry over
+	*button
+	toggle		*C.GtkToggleButton
+	checkbox		*C.GtkCheckButton
+}
+
+func newCheckbox(text string) *checkbox {
+	ctext := togstr(text)
+	defer freegstr(ctext)
+	widget := C.gtk_check_button_new_with_label(ctext)
+	return &checkbox{
+		button:		finishNewButton(widget, "toggled", C.checkboxToggled),
+		toggle:		(*C.GtkToggleButton)(unsafe.Pointer(widget)),
+		checkbox:	(*C.GtkCheckButton)(unsafe.Pointer(widget)),
+	}
+}
+
+//export checkboxToggled
+func checkboxToggled(bwid *C.GtkToggleButton, data C.gpointer) {
+	// note that the finishNewButton() call uses the embedded *button as data
+	// this is fine because we're only deferring to buttonClicked() anyway
+	buttonClicked(nil, data)
+}
+
+func (c *checkbox) Checked() bool {
+	return fromgbool(C.gtk_toggle_button_get_active(c.toggle))
+}
+
+func (c *checkbox) SetChecked(checked bool) {
+	C.gtk_toggle_button_set_active(c.toggle, togbool(checked))
+}

redo/zz_test.go

@@ -5,6 +5,7 @@ package ui
 // This file is called zz_test.go to keep it separate from the other files in this package (and because go test won't accept just test.go)
 
 import (
+	"fmt"
 	"flag"
 	"testing"
 )
@@ -39,6 +40,12 @@ func init() {
 					w.Close()
 					Stop()
 					done <- struct{}{}
+				} else {
+					c := NewCheckbox("You Should Now See Me Instead")
+					w.SetControl(c)
+					c.OnClicked(func() {
+						w.SetTitle(fmt.Sprint(c.Checked()))
+					})
 				}
 			})
 			w.Show()