1 files changed, 114 insertions, 0 deletions
diff --git a/button.go b/button.go
new file mode 100644
index 0000000..2696f82
--- /dev/null
+++ b/button.go
@@ -0,0 +1,114 @@
+// 12 december 2015
+
+package ui
+
+import (
+	"unsafe"
+)
+
+// #include "ui.h"
+// extern void doButtonOnClicked(uiButton *, void *);
+// static inline void realuiButtonOnClicked(uiButton *b)
+// {
+// 	uiButtonOnClicked(b, doButtonOnClicked, NULL);
+// }
+import "C"
+
+// no need to lock this; only the GUI thread can access it
+var buttons = make(map[*C.uiButton]*Button)
+
+// Button is a Control that represents a button that the user can
+// click to perform an action. A Button has a text label that should
+// describe what the button does.
+type Button struct {
+	c	*C.uiControl
+	b	*C.uiButton
+
+	onClicked		func(*Button)
+}
+
+// NewButton creates a new Button with the given text as its label.
+func NewButton(text string) *Button {
+	b := new(Button)
+
+	ctext := C.CString(text)
+	b.b = C.uiNewButton(ctext)
+	b.c = (*C.uiControl)(unsafe.Pointer(b.b))
+	freestr(ctext)
+
+	C.realuiButtonOnClicked(b.b)
+	buttons[b.b] = b
+
+	return b
+}
+
+// Destroy destroys the Button.
+func (b *Button) Destroy() {
+	delete(buttons, b.b)
+	C.uiControlDestroy(b.c)
+}
+
+// LibuiControl returns the libui uiControl pointer that backs
+// the Button. This is only used by package ui itself and should
+// not be called by programs.
+func (b *Button) LibuiControl() uintptr {
+	return uintptr(unsafe.Pointer(b.c))
+}
+
+// Handle returns the OS-level handle associated with this Button.
+// On Windows this is an HWND of a standard Windows API BUTTON
+// class (as provided by Common Controls version 6).
+// On GTK+ this is a pointer to a GtkButton.
+// On OS X this is a pointer to a NSButton.
+func (b *Button) Handle() uintptr {
+	return uintptr(C.uiControlHandle(b.c))
+}
+
+// Show shows the Button.
+func (b *Button) Show() {
+	C.uiControlShow(b.c)
+}
+
+// Hide hides the Button.
+func (b *Button) Hide() {
+	C.uiControlHide(b.c)
+}
+
+// Enable enables the Button.
+func (b *Button) Enable() {
+	C.uiControlEnable(b.c)
+}
+
+// Disable disables the Button.
+func (b *Button) Disable() {
+	C.uiControlDisable(b.c)
+}
+
+// Text returns the Button's text.
+func (b *Button) Text() string {
+	ctext := C.uiButtonText(b.b)
+	text := C.GoString(ctext)
+	C.uiFreeText(ctext)
+	return text
+}
+
+// SetText sets the Button's text to text.
+func (b *Button) SetText(text string) {
+	ctext := C.CString(text)
+	C.uiButtonSetText(b.b, ctext)
+	freestr(ctext)
+}
+
+// OnClicked registers f to be run when the user clicks the Button.
+// Only one function can be registered at a time.
+func (b *Button) OnClicked(f func(*Button)) {
+	b.onClicked = f
+}
+
+//export doButtonOnClicked
+func doButtonOnClicked(bb *C.uiButton, data unsafe.Pointer) {
+	b := buttons[bb]
+	if b.onClicked != nil {
+		b.onClicked(b)
+	}
+}