public class WindowsImManager {

    private static boolean status = true;

    private static native WinNT.HANDLE ImmGetContext(WinDef.HWND hwnd);

    private static native WinNT.HANDLE ImmAssociateContext(WinDef.HWND hwnd, WinNT.HANDLE himc);

    private static native boolean ImmReleaseContext(WinDef.HWND hwnd, WinNT.HANDLE himc);

    private static native WinNT.HANDLE ImmCreateContext();

    private static native boolean ImmDestroyContext(WinNT.HANDLE himc);

    static {
        Native.register("imm32");
    }

    private static final User32 u = User32.INSTANCE;

    /**
     * 打开输入法
     */
    public static void makeOn() {
        if (status) {
            return;
        }
        status = true;
        WinDef.HWND hwnd = u.GetForegroundWindow();
        WinNT.HANDLE himc = ImmGetContext(hwnd);
        if (himc == null) {
            himc = ImmCreateContext();
            ImmAssociateContext(hwnd, himc);
        }
        ImmReleaseContext(hwnd, himc);
    }

    /**
     * 关闭输入法
     */
    public static void makeOff() {
        if (!status) {
            return;
        }
        status = false;
        WinDef.HWND hwnd = u.GetForegroundWindow();
        WinNT.HANDLE himc = ImmAssociateContext(hwnd, null);
        if (himc != null) {
            ImmDestroyContext(himc);
        }
        ImmReleaseContext(hwnd, himc);
    }
}