63 lines
1.6 KiB
Go
63 lines
1.6 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 "pkgui.h"
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import "C"
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// ColorButton is a Control that represents a button that the user can
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// click to select a color.
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type ColorButton struct {
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ControlBase
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b *C.uiColorButton
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onChanged func(*ColorButton)
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}
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// NewColorButton creates a new ColorButton.
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func NewColorButton() *ColorButton {
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b := new(ColorButton)
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b.b = C.uiNewColorButton()
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C.pkguiColorButtonOnChanged(b.b)
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b.ControlBase = NewControlBase(b, uintptr(unsafe.Pointer(b.b)))
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return b
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}
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// Color returns the color currently selected in the ColorButton.
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// Colors are not alpha-premultiplied.
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// TODO rename b or bl
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func (b *ColorButton) Color() (r, g, bl, a float64) {
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c := C.pkguiAllocColorDoubles()
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defer C.pkguiFreeColorDoubles(c)
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C.uiColorButtonColor(b.b, c.r, c.g, c.b, c.a)
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return float64(*(c.r)), float64(*(c.g)), float64(*(c.b)), float64(*(c.a))
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}
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// SetColor sets the currently selected color in the ColorButton.
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// Colors are not alpha-premultiplied.
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// TODO rename b or bl
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func (b *ColorButton) SetColor(r, g, bl, a float64) {
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C.uiColorButtonSetColor(b.b, C.double(r), C.double(g), C.double(bl), C.double(a))
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}
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// OnChanged registers f to be run when the user changes the
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// currently selected color in the ColorButton. Only one function
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// can be registered at a time.
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func (b *ColorButton) OnChanged(f func(*ColorButton)) {
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b.onChanged = f
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}
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//export pkguiDoColorButtonOnChanged
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func pkguiDoColorButtonOnChanged(bb *C.uiColorButton, data unsafe.Pointer) {
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b := ControlFromLibui(uintptr(unsafe.Pointer(bb))).(*ColorButton)
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if b.onChanged != nil {
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b.onChanged(b)
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}
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}
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