1 files changed, 111 insertions, 0 deletions
diff --git a/spinbox.go b/spinbox.go
new file mode 100644
index 0000000..77cedf5
--- /dev/null
+++ b/spinbox.go
@@ -0,0 +1,111 @@
+// 12 december 2015
+
+package ui
+
+import (
+	"unsafe"
+)
+
+// #include "ui.h"
+// extern void doSpinboxOnChanged(uiSpinbox *, void *);
+// static inline void realuiSpinboxOnChanged(uiSpinbox *b)
+// {
+// 	uiSpinboxOnChanged(b, doSpinboxOnChanged, NULL);
+// }
+import "C"
+
+// no need to lock this; only the GUI thread can access it
+var spinboxes = make(map[*C.uiSpinbox]*Spinbox)
+
+// Spinbox is a Control that represents a space where the user can
+// enter integers. The space also comes with buttons to add or
+// subtract 1 from the integer.
+type Spinbox struct {
+	c	*C.uiControl
+	s	*C.uiSpinbox
+
+	onChanged		func(*Spinbox)
+}
+
+// NewSpinbox creates a new Spinbox. TODO limits
+func NewSpinbox(min int, max int) *Spinbox {
+	s := new(Spinbox)
+
+	s.s = C.uiNewSpinbox(C.intmax_t(min), C.intmax_t(max))
+	s.c = (*C.uiControl)(unsafe.Pointer(s.s))
+
+	C.realuiSpinboxOnChanged(s.s)
+	spinboxes[s.s] = s
+
+	return s
+}
+
+// Destroy destroys the Spinbox.
+func (s *Spinbox) Destroy() {
+	delete(spinboxes, s.s)
+	C.uiControlDestroy(s.c)
+}
+
+// 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 (s *Spinbox) LibuiControl() uintptr {
+	return uintptr(unsafe.Pointer(s.c))
+}
+
+// Handle returns the OS-level handle associated with this Spinbox.
+// On Windows this is an HWND of a standard Windows API EDIT
+// class (as provided by Common Controls version 6). Due to
+// various limitations which affect the lifetime of the associated
+// Common Controls version 6 UPDOWN_CLASS window that
+// provides the buttons, there is no way to access it.
+// On GTK+ this is a pointer to a GtkSpinButton.
+// On OS X this is a pointer to a NSView that contains a NSTextField
+// and a NSStepper as subviews.
+func (s *Spinbox) Handle() uintptr {
+	return uintptr(C.uiControlHandle(s.c))
+}
+
+// Show shows the Spinbox.
+func (s *Spinbox) Show() {
+	C.uiControlShow(s.c)
+}
+
+// Hide hides the Spinbox.
+func (s *Spinbox) Hide() {
+	C.uiControlHide(s.c)
+}
+
+// Enable enables the Spinbox.
+func (s *Spinbox) Enable() {
+	C.uiControlEnable(s.c)
+}
+
+// Disable disables the Spinbox.
+func (s *Spinbox) Disable() {
+	C.uiControlDisable(s.c)
+}
+
+// Value returns the Spinbox's current value.
+func (s *Spinbox) Value() int {
+	return int(C.uiSpinboxValue(s.s))
+}
+
+// SetText sets the Spinbox's current value to value.
+func (s *Spinbox) SetValue(value int) {
+	C.uiSpinboxSetValue(s.s, C.intmax_t(value))
+}
+
+// OnChanged registers f to be run when the user changes the value
+// of the Spinbox. Only one function can be registered at a time.
+func (s *Spinbox) OnChanged(f func(*Spinbox)) {
+	s.onChanged = f
+}
+
+//export doSpinboxOnChanged
+func doSpinboxOnChanged(ss *C.uiSpinbox, data unsafe.Pointer) {
+	s := spinboxes[ss]
+	if s.onChanged != nil {
+		s.onChanged(s)
+	}
+}