1 files changed, 108 insertions, 0 deletions
diff --git a/slider.go b/slider.go
new file mode 100644
index 0000000..74e07fb
--- /dev/null
+++ b/slider.go
@@ -0,0 +1,108 @@
+// 12 december 2015
+
+package ui
+
+import (
+	"unsafe"
+)
+
+// #include "ui.h"
+// extern void doSliderOnChanged(uiSlider *, void *);
+// static inline void realuiSliderOnChanged(uiSlider *b)
+// {
+// 	uiSliderOnChanged(b, doSliderOnChanged, NULL);
+// }
+import "C"
+
+// no need to lock this; only the GUI thread can access it
+var sliders = make(map[*C.uiSlider]*Slider)
+
+// Slider is a Control that represents a horizontal bar that represents
+// a range of integers. The user can drag a pointer on the bar to
+// select an integer.
+type Slider struct {
+	c	*C.uiControl
+	s	*C.uiSlider
+
+	onChanged		func(*Slider)
+}
+
+// NewSlider creates a new Slider. TODO limits
+func NewSlider(min int, max int) *Slider {
+	s := new(Slider)
+
+	s.s = C.uiNewSlider(C.intmax_t(min), C.intmax_t(max))
+	s.c = (*C.uiControl)(unsafe.Pointer(s.s))
+
+	C.realuiSliderOnChanged(s.s)
+	sliders[s.s] = s
+
+	return s
+}
+
+// Destroy destroys the Slider.
+func (s *Slider) Destroy() {
+	delete(sliders, 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 *Slider) LibuiControl() uintptr {
+	return uintptr(unsafe.Pointer(s.c))
+}
+
+// Handle returns the OS-level handle associated with this Slider.
+// On Windows this is an HWND of a standard Windows API
+// TRACKBAR_CLASS class (as provided by Common Controls
+// version 6).
+// On GTK+ this is a pointer to a GtkScale.
+// On OS X this is a pointer to a NSSlider.
+func (s *Slider) Handle() uintptr {
+	return uintptr(C.uiControlHandle(s.c))
+}
+
+// Show shows the Slider.
+func (s *Slider) Show() {
+	C.uiControlShow(s.c)
+}
+
+// Hide hides the Slider.
+func (s *Slider) Hide() {
+	C.uiControlHide(s.c)
+}
+
+// Enable enables the Slider.
+func (s *Slider) Enable() {
+	C.uiControlEnable(s.c)
+}
+
+// Disable disables the Slider.
+func (s *Slider) Disable() {
+	C.uiControlDisable(s.c)
+}
+
+// Value returns the Slider's current value.
+func (s *Slider) Value() int {
+	return int(C.uiSliderValue(s.s))
+}
+
+// SetText sets the Slider's current value to value.
+func (s *Slider) SetValue(value int) {
+	C.uiSliderSetValue(s.s, C.intmax_t(value))
+}
+
+// OnChanged registers f to be run when the user changes the value
+// of the Slider. Only one function can be registered at a time.
+func (s *Slider) OnChanged(f func(*Slider)) {
+	s.onChanged = f
+}
+
+//export doSliderOnChanged
+func doSliderOnChanged(ss *C.uiSlider, data unsafe.Pointer) {
+	s := sliders[ss]
+	if s.onChanged != nil {
+		s.onChanged(s)
+	}
+}