59 lines
1.4 KiB
Go
59 lines
1.4 KiB
Go
// 12 december 2015
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package ui
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import (
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"unsafe"
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)
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// #include "ui.h"
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// extern void doSliderOnChanged(uiSlider *, void *);
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// // see golang/go#19835
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// typedef void (*sliderCallback)(uiSlider *, void *);
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import "C"
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// Slider is a Control that represents a horizontal bar that represents
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// a range of integers. The user can drag a pointer on the bar to
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// select an integer.
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type Slider struct {
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ControlBase
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s *C.uiSlider
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onChanged func(*Slider)
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}
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// NewSlider creates a new Slider. If min >= max, they are swapped.
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func NewSlider(min int, max int) *Slider {
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s := new(Slider)
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s.s = C.uiNewSlider(C.int(min), C.int(max))
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C.uiSliderOnChanged(s.s, C.sliderCallback(C.doSliderOnChanged), nil)
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s.ControlBase = NewControlBase(s, uintptr(unsafe.Pointer(s.s)))
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return s
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}
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// Value returns the Slider's current value.
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func (s *Slider) Value() int {
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return int(C.uiSliderValue(s.s))
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}
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// SetValue sets the Slider's current value to value.
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func (s *Slider) SetValue(value int) {
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C.uiSliderSetValue(s.s, C.int(value))
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}
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// OnChanged registers f to be run when the user changes the value
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// of the Slider. Only one function can be registered at a time.
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func (s *Slider) OnChanged(f func(*Slider)) {
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s.onChanged = f
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}
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//export doSliderOnChanged
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func doSliderOnChanged(ss *C.uiSlider, data unsafe.Pointer) {
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s := ControlFromLibui(uintptr(unsafe.Pointer(ss))).(*Slider)
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if s.onChanged != nil {
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s.onChanged(s)
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}
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}
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