70 lines
1.7 KiB
Go
70 lines
1.7 KiB
Go
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// 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 <stdlib.h>
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// #include "ui.h"
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// #include "util.h"
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// extern void doFontButtonOnChanged(uiFontButton *, void *);
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// // see golang/go#19835
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// typedef void (*fontButtonCallback)(uiFontButton *, void *);
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// static inline uiFontDescriptor *pkguiNewFontDescriptor(void)
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// {
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// return (uiFontDescriptor *) pkguiAlloc(sizeof (uiFontDescriptor));
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// }
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// static inline void pkguiFreeFontDescriptor(uiFontDescriptor *fd)
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// {
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// free(fd);
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// }
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import "C"
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// FontButton is a Control that represents a button that the user can
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// click to select a font.
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type FontButton struct {
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ControlBase
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b *C.uiFontButton
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onChanged func(*FontButton)
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}
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// NewFontButton creates a new FontButton.
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func NewFontButton() *FontButton {
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b := new(FontButton)
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b.b = C.uiNewFontButton()
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C.uiFontButtonOnChanged(b.b, C.fontButtonCallback(C.doFontButtonOnChanged), nil)
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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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// Font returns the font currently selected in the FontButton.
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func (b *FontButton) Font() *FontDescriptor {
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cfd := C.pkguiNewFontDescriptor()
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defer C.pkguiFreeFontDescriptor(cfd)
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C.uiFontButtonFont(b.b, cfd)
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defer C.uiFreeFontButtonFont(cfd)
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fd := &FontDescriptor{}
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fd.fromLibui(cfd)
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return fd
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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 font in the FontButton. Only one function can
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// be registered at a time.
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func (b *FontButton) OnChanged(f func(*FontButton)) {
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b.onChanged = f
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}
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//export doFontButtonOnChanged
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func doFontButtonOnChanged(bb *C.uiFontButton, data unsafe.Pointer) {
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b := ControlFromLibui(uintptr(unsafe.Pointer(bb))).(*FontButton)
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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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