Added FontButton.

1 files changed, 69 insertions, 0 deletions

diff --git a/fontbutton.go b/fontbutton.go
new file mode 100644
index 0000000..c228151
--- /dev/null
+++ b/fontbutton.go
@@ -0,0 +1,69 @@
+// 12 december 2015
+
+package ui
+
+import (
+	"unsafe"
+)
+
+// #include <stdlib.h>
+// #include "ui.h"
+// #include "util.h"
+// extern void doFontButtonOnChanged(uiFontButton *, void *);
+// // see golang/go#19835
+// typedef void (*fontButtonCallback)(uiFontButton *, void *);
+// static inline uiFontDescriptor *pkguiNewFontDescriptor(void)
+// {
+// 	return (uiFontDescriptor *) pkguiAlloc(sizeof (uiFontDescriptor));
+// }
+// static inline void pkguiFreeFontDescriptor(uiFontDescriptor *fd)
+// {
+// 	free(fd);
+// }
+import "C"
+
+// FontButton is a Control that represents a button that the user can
+// click to select a font.
+type FontButton struct {
+	ControlBase
+	b	*C.uiFontButton
+	onChanged		func(*FontButton)
+}
+
+// NewFontButton creates a new FontButton.
+func NewFontButton() *FontButton {
+	b := new(FontButton)
+
+	b.b = C.uiNewFontButton()
+
+	C.uiFontButtonOnChanged(b.b, C.fontButtonCallback(C.doFontButtonOnChanged), nil)
+
+	b.ControlBase = NewControlBase(b, uintptr(unsafe.Pointer(b.b)))
+	return b
+}
+
+// Font returns the font currently selected in the FontButton.
+func (b *FontButton) Font() *FontDescriptor {
+	cfd := C.pkguiNewFontDescriptor()
+	defer C.pkguiFreeFontDescriptor(cfd)
+	C.uiFontButtonFont(b.b, cfd)
+	defer C.uiFreeFontButtonFont(cfd)
+	fd := &FontDescriptor{}
+	fd.fromLibui(cfd)
+	return fd
+}
+
+// OnChanged registers f to be run when the user changes the
+// currently selected font in the FontButton. Only one function can
+// be registered at a time.
+func (b *FontButton) OnChanged(f func(*FontButton)) {
+	b.onChanged = f
+}
+
+//export doFontButtonOnChanged
+func doFontButtonOnChanged(bb *C.uiFontButton, data unsafe.Pointer) {
+	b := ControlFromLibui(uintptr(unsafe.Pointer(bb))).(*FontButton)
+	if b.onChanged != nil {
+		b.onChanged(b)
+	}
+}