109 lines
2.5 KiB
Go
109 lines
2.5 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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// static inline void realuiSliderOnChanged(uiSlider *b)
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// {
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// uiSliderOnChanged(b, doSliderOnChanged, NULL);
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// }
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import "C"
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// no need to lock this; only the GUI thread can access it
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var sliders = make(map[*C.uiSlider]*Slider)
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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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c *C.uiControl
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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. TODO limits
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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.intmax_t(min), C.intmax_t(max))
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s.c = (*C.uiControl)(unsafe.Pointer(s.s))
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C.realuiSliderOnChanged(s.s)
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sliders[s.s] = s
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return s
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}
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// Destroy destroys the Slider.
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func (s *Slider) Destroy() {
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delete(sliders, s.s)
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C.uiControlDestroy(s.c)
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}
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// LibuiControl returns the libui uiControl pointer that backs
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// the Window. This is only used by package ui itself and should
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// not be called by programs.
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func (s *Slider) LibuiControl() uintptr {
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return uintptr(unsafe.Pointer(s.c))
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}
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// Handle returns the OS-level handle associated with this Slider.
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// On Windows this is an HWND of a standard Windows API
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// TRACKBAR_CLASS class (as provided by Common Controls
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// version 6).
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// On GTK+ this is a pointer to a GtkScale.
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// On OS X this is a pointer to a NSSlider.
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func (s *Slider) Handle() uintptr {
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return uintptr(C.uiControlHandle(s.c))
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}
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// Show shows the Slider.
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func (s *Slider) Show() {
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C.uiControlShow(s.c)
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}
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// Hide hides the Slider.
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func (s *Slider) Hide() {
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C.uiControlHide(s.c)
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}
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// Enable enables the Slider.
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func (s *Slider) Enable() {
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C.uiControlEnable(s.c)
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}
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// Disable disables the Slider.
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func (s *Slider) Disable() {
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C.uiControlDisable(s.c)
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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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// SetText 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.intmax_t(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 := sliders[ss]
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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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