uefi loop

UINTN           WaitIndex;
EFI_INPUT_KEY   Key;
while(TRUE) {
  int button_y = dialog_y+dialog_h-libaroma_dp(52);

  /* clean button area */
  libaroma_draw_rect(dc, dialog_x, button_y, dialog_w, libaroma_dp(36), colorBackground, 0xff);

  if(Button1) {
    /* button1 */
    int button_w = button_width(Button1);
    int button_x = dialog_x+dialog_w-button_w-libaroma_dp(16);

    if(Selection==0) {
      libaroma_gradient_ex(dc,
        button_x,button_y,
        button_w, libaroma_dp(36),
        colorSelection,colorSelection,
        libaroma_dp(2), /* rounded 2dp */
        0x1111, /* all corners */
        0x40, 0x40 /* start & end alpha */
      );
    }
    button_draw(Button1, button_x, button_y-libaroma_dp(2), button_w, libaroma_dp(36));

    /* button2 */
    if(Button2) {
      button_w = button_width(Button2);
      button_x -= (libaroma_dp(8)+button_w);
      if(Selection==1) {
        libaroma_gradient_ex(dc,
          button_x,button_y,
          button_w, libaroma_dp(36),
          colorSelection,colorSelection,
          libaroma_dp(2), /* rounded 2dp */
          0x1111, /* all corners */
          0x40, 0x40 /* start & end alpha */
        );
      }
      button_draw(Button2, button_x, button_y-libaroma_dp(2), button_w, libaroma_dp(36));
    }
  }
  libaroma_sync();

  EFI_STATUS Status = gBS->WaitForEvent (1, &gST->ConIn->WaitForKey, &WaitIndex);
  ASSERT_EFI_ERROR (Status);

  Status = gST->ConIn->ReadKeyStroke (gST->ConIn, &Key);

  if(Key.ScanCode==SCAN_NULL) {
    switch(Key.UnicodeChar) {
      case CHAR_CARRIAGE_RETURN:
        RenderActiveMenu();
        mGop->SetMode(mGop, OldMode);
        return Selection;
    }
  }
  else {
    switch(Key.ScanCode) {
      case SCAN_UP:
        if(Selection>0)
          Selection--;
        else Selection = MaxSelection-1;
        break;
      case SCAN_DOWN:
        if(Selection+1<MaxSelection)
          Selection++;
        else Selection = 0;
        break;
    }
  }
}