Added code for Controls.

control.go

@@ -0,0 +1,96 @@
+// 12 december 2015
+
+package ui
+
+import (
+	"unsafe"
+)
+
+// #include "ui.h"
+import "C"
+
+// Control represents a GUI control. It provdes methods
+// common to all Controls.
+// 
+// To create a new Control, implement the control on
+// the libui side, then provide access to that control on
+// the Go side via an implementation of Control as
+// described.
+type Control interface {
+	// Destroy destroys the Control.
+	// 
+	// Implementations should do any necessary cleanup,
+	// then call LibuiControlDestroy.
+	Destroy()
+
+	// Handle returns the OS-level handle that backs the
+	// Control. On OSs that use reference counting for
+	// controls, Handle does not increment the reference
+	// count; you are sharing package ui's reference.
+	// 
+	// Implementations should call LibuiControlHandle and
+	// document exactly what kind of handle is returned.
+	Handle() uintptr
+
+	// Show shows the Control.
+	// 
+	// Implementations should call LibuiControlShow.
+	Show()
+
+	// Hide shows the Control. Hidden controls do not participate
+	// in layout (that is, Box, Grid, etc. does not reserve space for
+	// hidden controls).
+	// 
+	// Implementations should call LibuiControlHide.
+	Hide()
+
+	// Enable enables the Control.
+	// 
+	// Implementations should call LibuiControlEnable.
+	Enable()
+
+	// Disable disables the Control.
+	// 
+	// Implementations should call LibuiControlDisable.
+	Disable()
+}
+
+func touiControl(c uintptr) *C.uiControl {
+	return (*C.uiControl)(unsafe.Pointer(c))
+}
+
+// LibuiControlDestroy allows implementations of Control
+// to call the libui function uiControlDestroy.
+func LibuiControlDestroy(c uintptr) {
+	C.uiControlDestroy(touiControl(c))
+}
+
+// LibuiControlHandle allows implementations of Control
+// to call the libui function uiControlHandle.
+func LibuiControlHandle(c uintptr) uintptr {
+	return uintptr(C.uiControlHandle(touiControl(c)))
+}
+
+// LibuiControlShow allows implementations of Control
+// to call the libui function uiControlShow.
+func LibuiControlShow(c uintptr) {
+	C.uiControlShow(touiControl(c))
+}
+
+// LibuiControlHide allows implementations of Control
+// to call the libui function uiControlHide.
+func LibuiControlHide(c uintptr) {
+	C.uiControlHide(touiControl(c))
+}
+
+// LibuiControlEnable allows implementations of Control
+// to call the libui function uiControlEnable.
+func LibuiControlEnable(c uintptr) {
+	C.uiControlEnable(touiControl(c))
+}
+
+// LibuiControlDisable allows implementations of Control
+// to call the libui function uiControlDisable.
+func LibuiControlDisable(c uintptr) {
+	C.uiControlDisable(touiControl(c))
+}