/** @file

  This library class defines a set of interfaces to customize Display module

Copyright (c) 2013 - 2014, Intel Corporation. All rights reserved.<BR>
This program and the accompanying materials are licensed and made available under 
the terms and conditions of the BSD License that accompanies this distribution.  
The full text of the license may be found at
http://opensource.org/licenses/bsd-license.php.                                            

THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,                     
WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.

**/
#include "CustomizedDisplayLibInternal.h"

EFI_GUID          gCustomizedDisplayLibGuid = { 0x99fdc8fd, 0x849b, 0x4eba, { 0xad, 0x13, 0xfb, 0x96, 0x99, 0xc9, 0xa, 0x4d } };

EFI_HII_HANDLE    mCDLStringPackHandle;
UINT16            gClassOfVfr;                 // Formset class information
BOOLEAN           gLibIsFirstForm = TRUE;
BANNER_DATA       *gBannerData;

UINTN             gFooterHeight;

/**
+------------------------------------------------------------------------------+
|                                 Setup Page                                   |
+------------------------------------------------------------------------------+

Statement
Statement
Statement





+------------------------------------------------------------------------------+
|                                F9=Reset to Defaults        F10=Save          |
| ^"=Move Highlight          <Spacebar> Toggles Checkbox     Esc=Exit          |
+------------------------------------------------------------------------------+
  StatusBar
**/

/**
  This funtion defines Page Frame and Backgroud. 
  
  Based on the above layout, it will be responsible for HeaderHeight, FooterHeight, 
  StatusBarHeight and Backgroud. And, it will reserve Screen for Statement. 

  @param[in]  FormData             Form Data to be shown in Page.
  @param[out] ScreenForStatement   Screen to be used for Statement. (Prompt, Value and Help)
  
  @return Status
**/
EFI_STATUS
EFIAPI
DisplayPageFrame (
  IN FORM_DISPLAY_ENGINE_FORM       *FormData,
  OUT EFI_SCREEN_DESCRIPTOR         *ScreenForStatement
  )
{
  EFI_STATUS             Status;

  ASSERT (FormData != NULL && ScreenForStatement != NULL);
  if (FormData == NULL || ScreenForStatement == NULL) {
    return EFI_INVALID_PARAMETER;
  }

  Status = ScreenDiemensionInfoValidate (FormData);
  if (EFI_ERROR (Status)) {
    return Status;
  }

  gClassOfVfr = FORMSET_CLASS_PLATFORM_SETUP;

  ProcessExternedOpcode(FormData);

  //
  // Calculate the ScreenForStatement.
  //
  ScreenForStatement->BottomRow   = gScreenDimensions.BottomRow - STATUS_BAR_HEIGHT - gFooterHeight;
  if (gClassOfVfr == FORMSET_CLASS_FRONT_PAGE) {
    ScreenForStatement->TopRow    = gScreenDimensions.TopRow + FRONT_PAGE_HEADER_HEIGHT;
  } else {
    ScreenForStatement->TopRow    = gScreenDimensions.TopRow + NONE_FRONT_PAGE_HEADER_HEIGHT;
  }
  ScreenForStatement->LeftColumn  = gScreenDimensions.LeftColumn;
  ScreenForStatement->RightColumn = gScreenDimensions.RightColumn;

  if ((gLibIsFirstForm) || ((FormData->Attribute & HII_DISPLAY_MODAL) != 0)) {
    //
    // Ensure we are in Text mode
    //
    gST->ConOut->SetAttribute (gST->ConOut, EFI_TEXT_ATTR (EFI_LIGHTGRAY, EFI_BLACK));
    ClearLines (0, gScreenDimensions.RightColumn, 0, gScreenDimensions.BottomRow, KEYHELP_BACKGROUND);
    gLibIsFirstForm = FALSE;
  }

  //
  // Don't print frame for modal form.
  //
  if ((FormData->Attribute & HII_DISPLAY_MODAL) != 0) {
    return EFI_SUCCESS;
  }

  if (gClassOfVfr == FORMSET_CLASS_FRONT_PAGE) {
    PrintBannerInfo (FormData);
  }

  PrintFramework (FormData);

  UpdateStatusBar(NV_UPDATE_REQUIRED, FormData->SettingChangedFlag);

  return EFI_SUCCESS;
}

/**
  This function updates customized key panel's help information.
  The library will prepare those Strings for the basic key, ESC, Enter, Up/Down/Left/Right, +/-.
  and arrange them in Footer panel.
  
  @param[in]  FormData       Form Data to be shown in Page. FormData has the highlighted statement. 
  @param[in]  Statement      The statement current selected.
  @param[in]  Selected       Whether or not a tag be selected. TRUE means Enter has hit this question.
**/
VOID
EFIAPI
RefreshKeyHelp (
  IN FORM_DISPLAY_ENGINE_FORM      *FormData,
  IN FORM_DISPLAY_ENGINE_STATEMENT *Statement,
  IN  BOOLEAN                      Selected
  )
{
  UINTN                  SecCol;
  UINTN                  ThdCol;
  UINTN                  RightColumnOfHelp;
  UINTN                  TopRowOfHelp;
  UINTN                  BottomRowOfHelp;
  UINTN                  StartColumnOfHelp;
  EFI_IFR_NUMERIC        *NumericOp;
  EFI_IFR_DATE           *DateOp;
  EFI_IFR_TIME           *TimeOp;
  BOOLEAN                HexDisplay;
  UINTN                  ColumnWidth1;
  UINTN                  ColumnWidth2;
  UINTN                  ColumnWidth3;
  CHAR16                 *ColumnStr1;
  CHAR16                 *ColumnStr2;
  CHAR16                 *ColumnStr3;

  ASSERT (FormData != NULL);
  if (FormData == NULL) {
    return;
  }

  gST->ConOut->SetAttribute (gST->ConOut, KEYHELP_TEXT | KEYHELP_BACKGROUND);

  if ((FormData->Attribute & HII_DISPLAY_MODAL) != 0) {
    return;
  }

  SecCol            = gScreenDimensions.LeftColumn + (gScreenDimensions.RightColumn - gScreenDimensions.LeftColumn) / 3;
  ThdCol            = gScreenDimensions.LeftColumn + (gScreenDimensions.RightColumn - gScreenDimensions.LeftColumn) / 3 * 2;

  //
  // + 2 means leave 1 space before the first hotkey info.
  //
  StartColumnOfHelp = gScreenDimensions.LeftColumn + 2;
  RightColumnOfHelp = gScreenDimensions.RightColumn - 1;
  TopRowOfHelp      = gScreenDimensions.BottomRow - STATUS_BAR_HEIGHT - gFooterHeight + 1;
  BottomRowOfHelp   = gScreenDimensions.BottomRow - STATUS_BAR_HEIGHT - 2;

  ColumnWidth1      = SecCol - StartColumnOfHelp;
  ColumnWidth2      = ThdCol - SecCol;
  ColumnWidth3      = RightColumnOfHelp - ThdCol;
  ColumnStr1        = gLibEmptyString;
  ColumnStr2        = gLibEmptyString;
  ColumnStr3        = gLibEmptyString;

  //
  // Clean the space at gScreenDimensions.LeftColumn + 1.
  //
  PrintStringAtWithWidth (StartColumnOfHelp - 1, BottomRowOfHelp, gLibEmptyString, 1);
  PrintStringAtWithWidth (StartColumnOfHelp - 1, TopRowOfHelp, gLibEmptyString, 1);

  if (Statement == NULL) {
    //
    // Print Key for Form without showable statement.
    //
    PrintHotKeyHelpString (FormData, TRUE);
    PrintStringAtWithWidth (StartColumnOfHelp, BottomRowOfHelp, gLibEmptyString, ColumnWidth1);
    PrintStringAtWithWidth (SecCol, BottomRowOfHelp, gLibEmptyString, ColumnWidth2);
    PrintStringAtWithWidth (StartColumnOfHelp, TopRowOfHelp, gLibEmptyString, ColumnWidth1);
    if (gClassOfVfr == FORMSET_CLASS_PLATFORM_SETUP) {
      ColumnStr3 = gEscapeString;
    }
    PrintStringAtWithWidth (ThdCol, BottomRowOfHelp, ColumnStr3, ColumnWidth3);

    return;
  }

  HexDisplay = FALSE;
  NumericOp = NULL;
  DateOp    = NULL;
  TimeOp    = NULL;
  if (Statement->OpCode->OpCode == EFI_IFR_NUMERIC_OP) {
    NumericOp = (EFI_IFR_NUMERIC *) Statement->OpCode;
    HexDisplay = (NumericOp->Flags & EFI_IFR_DISPLAY_UINT_HEX) == EFI_IFR_DISPLAY_UINT_HEX;
  } else if (Statement->OpCode->OpCode == EFI_IFR_DATE_OP) {
    DateOp   = (EFI_IFR_DATE *) Statement->OpCode;
    HexDisplay = (DateOp->Flags & EFI_IFR_DISPLAY_UINT_HEX) == EFI_IFR_DISPLAY_UINT_HEX;
  } else if (Statement->OpCode->OpCode == EFI_IFR_TIME_OP) {
    TimeOp  = (EFI_IFR_TIME *) Statement->OpCode;
    HexDisplay = (TimeOp->Flags & EFI_IFR_DISPLAY_UINT_HEX) == EFI_IFR_DISPLAY_UINT_HEX;
  }  
  switch (Statement->OpCode->OpCode) {
  case EFI_IFR_ORDERED_LIST_OP:
  case EFI_IFR_ONE_OF_OP:
  case EFI_IFR_NUMERIC_OP:
  case EFI_IFR_TIME_OP:
  case EFI_IFR_DATE_OP:
    if (!Selected) {
      PrintHotKeyHelpString (FormData, TRUE);

      if (gClassOfVfr == FORMSET_CLASS_PLATFORM_SETUP) {
        ColumnStr3 = gEscapeString;
      }
      PrintStringAtWithWidth (ThdCol, BottomRowOfHelp, ColumnStr3, ColumnWidth3);

      if ((Statement->OpCode->OpCode == EFI_IFR_DATE_OP) ||
          (Statement->OpCode->OpCode == EFI_IFR_TIME_OP)) {
        PrintAt (
          ColumnWidth1, 
          StartColumnOfHelp,
          BottomRowOfHelp,
          L"%c%c%c%c%s",
          ARROW_UP,
          ARROW_DOWN,
          ARROW_RIGHT,
          ARROW_LEFT,
          gMoveHighlight
          );
        PrintStringAtWithWidth (SecCol, BottomRowOfHelp, gEnterString, ColumnWidth2);
        PrintStringAtWithWidth (StartColumnOfHelp, TopRowOfHelp, gAdjustNumber, ColumnWidth1);
      } else {
        PrintAt (ColumnWidth1, StartColumnOfHelp, BottomRowOfHelp, L"%c%c%s", ARROW_UP, ARROW_DOWN, gMoveHighlight);
        if (Statement->OpCode->OpCode == EFI_IFR_NUMERIC_OP && NumericOp != NULL && LibGetFieldFromNum(Statement->OpCode) != 0) {
          ColumnStr1 = gAdjustNumber;
        }
        PrintStringAtWithWidth (StartColumnOfHelp, TopRowOfHelp, ColumnStr1, ColumnWidth1);
        PrintStringAtWithWidth (SecCol, BottomRowOfHelp, gEnterString, ColumnWidth2);
      }
    } else {
      PrintHotKeyHelpString (FormData, FALSE);
      PrintStringAtWithWidth (SecCol, BottomRowOfHelp, gEnterCommitString, ColumnWidth2);

      //
      // If it is a selected numeric with manual input, display different message
      //
      if ((Statement->OpCode->OpCode == EFI_IFR_NUMERIC_OP) || 
          (Statement->OpCode->OpCode == EFI_IFR_DATE_OP) ||
          (Statement->OpCode->OpCode == EFI_IFR_TIME_OP)) {
        ColumnStr2 = HexDisplay ? gHexNumericInput : gDecNumericInput;
        PrintStringAtWithWidth (StartColumnOfHelp, BottomRowOfHelp, gLibEmptyString, ColumnWidth1);
      } else {
        PrintAt (ColumnWidth1, StartColumnOfHelp, BottomRowOfHelp, L"%c%c%s", ARROW_UP, ARROW_DOWN, gMoveHighlight);
      }

      if (Statement->OpCode->OpCode == EFI_IFR_ORDERED_LIST_OP) {
        ColumnStr1 = gPlusString;
        ColumnStr3 = gMinusString;
      }
      PrintStringAtWithWidth (StartColumnOfHelp, TopRowOfHelp, ColumnStr1, ColumnWidth1);
      PrintStringAtWithWidth (ThdCol, TopRowOfHelp, ColumnStr3, ColumnWidth3);
      PrintStringAtWithWidth (SecCol, TopRowOfHelp, ColumnStr2, ColumnWidth2);

      PrintStringAtWithWidth (ThdCol, BottomRowOfHelp, gEnterEscapeString, ColumnWidth3);
    }
    break;

  case EFI_IFR_CHECKBOX_OP:
    PrintHotKeyHelpString (FormData, TRUE);

    if (gClassOfVfr == FORMSET_CLASS_PLATFORM_SETUP) {
      ColumnStr3 = gEscapeString;
    }
    PrintStringAtWithWidth (ThdCol, BottomRowOfHelp, ColumnStr3, ColumnWidth3);

    PrintAt (ColumnWidth1, StartColumnOfHelp, BottomRowOfHelp, L"%c%c%s", ARROW_UP, ARROW_DOWN, gMoveHighlight);
    PrintStringAtWithWidth (SecCol, BottomRowOfHelp, gToggleCheckBox, ColumnWidth2);
    PrintStringAtWithWidth (StartColumnOfHelp, TopRowOfHelp, gLibEmptyString, ColumnWidth1);
    break;

  case EFI_IFR_REF_OP:
  case EFI_IFR_PASSWORD_OP:
  case EFI_IFR_STRING_OP:
  case EFI_IFR_TEXT_OP:
  case EFI_IFR_ACTION_OP:
  case EFI_IFR_RESET_BUTTON_OP:
  case EFI_IFR_SUBTITLE_OP:
     if (!Selected) {
      PrintHotKeyHelpString (FormData, TRUE);

      if (gClassOfVfr == FORMSET_CLASS_PLATFORM_SETUP) {
        ColumnStr3 = gEscapeString;
      }
      PrintStringAtWithWidth (ThdCol, BottomRowOfHelp, ColumnStr3, ColumnWidth3);

      PrintAt (ColumnWidth1, StartColumnOfHelp, BottomRowOfHelp, L"%c%c%s", ARROW_UP, ARROW_DOWN, gMoveHighlight);
      if (Statement->OpCode->OpCode != EFI_IFR_TEXT_OP && Statement->OpCode->OpCode != EFI_IFR_SUBTITLE_OP) {
        ColumnStr2 = gEnterString;
      }
      PrintStringAtWithWidth (SecCol, BottomRowOfHelp, ColumnStr2, ColumnWidth2);
      PrintStringAtWithWidth (StartColumnOfHelp, TopRowOfHelp, ColumnStr1, ColumnWidth1);
    } else {
      PrintHotKeyHelpString (FormData, FALSE);
      if (Statement->OpCode->OpCode != EFI_IFR_REF_OP) {
        ColumnStr2 = gEnterCommitString;
        ColumnStr3 = gEnterEscapeString;
      }
      PrintStringAtWithWidth (StartColumnOfHelp, TopRowOfHelp, ColumnStr1, ColumnWidth1);
      PrintStringAtWithWidth (StartColumnOfHelp, BottomRowOfHelp, ColumnStr1, ColumnWidth1);
      PrintStringAtWithWidth (SecCol, BottomRowOfHelp, ColumnStr2, ColumnWidth2);
      PrintStringAtWithWidth (ThdCol, BottomRowOfHelp, ColumnStr3, ColumnWidth3);
    }
    break;

  default:
    break;
  }  
}

/**
  Update status bar.

  This function updates the status bar on the bottom of menu screen. It just shows StatusBar. 
  Original logic in this function should be splitted out.

  @param[in]  MessageType            The type of message to be shown. InputError or Configuration Changed. 
  @param[in]  State                  Show or Clear Message.
**/
VOID
EFIAPI
UpdateStatusBar (
  IN  UINTN                  MessageType,
  IN  BOOLEAN                State
  )
{
  UINTN           Index;
  CHAR16          OptionWidth;

  OptionWidth = (CHAR16) ((gScreenDimensions.RightColumn - gScreenDimensions.LeftColumn) / 3);

  switch (MessageType) {
  case INPUT_ERROR:
    if (State) {
      gST->ConOut->SetAttribute (gST->ConOut, ERROR_TEXT);
      PrintStringAt (
        gScreenDimensions.LeftColumn + OptionWidth,
        gScreenDimensions.BottomRow - 1,
        gInputErrorMessage
        );
    } else {
      gST->ConOut->SetAttribute (gST->ConOut, KEYHELP_BACKGROUND);
      for (Index = 0; Index < (LibGetStringWidth (gInputErrorMessage) - 2) / 2; Index++) {
        PrintStringAt (gScreenDimensions.LeftColumn + OptionWidth + Index, gScreenDimensions.BottomRow - 1, L"  ");
      }
    }
    break;

  case NV_UPDATE_REQUIRED:
    //
    // Global setting support. Show configuration change on every form.
    //
    if (State) {
      gST->ConOut->SetAttribute (gST->ConOut, INFO_TEXT);
      PrintStringAt (
        gScreenDimensions.LeftColumn + OptionWidth * 2,
        gScreenDimensions.BottomRow - 1,
        gNvUpdateMessage
        );
    } else {
      gST->ConOut->SetAttribute (gST->ConOut, KEYHELP_BACKGROUND);
      for (Index = 0; Index < (LibGetStringWidth (gNvUpdateMessage) - 2) / 2; Index++) {
        PrintStringAt (
          (gScreenDimensions.LeftColumn + OptionWidth * 2 + Index),
          gScreenDimensions.BottomRow - 1,
          L"  "
          );
      }
    }
    break;

  default:
    break;
  } 
}

/**
  Create popup window. It will replace CreateDialog(). 

  This function draws OEM/Vendor specific pop up windows.

  @param[out]  Key    User Input Key
  @param       ...    String to be shown in Popup. The variable argument list is terminated by a NULL.
  
**/
VOID
EFIAPI
CreateDialog (
  OUT EFI_INPUT_KEY  *Key,        OPTIONAL
  ...
  )
{
  VA_LIST       Marker;
  EFI_INPUT_KEY KeyValue;
  EFI_STATUS    Status;
  UINTN         LargestString;
  UINTN         LineNum;
  UINTN   Index;
  UINTN   Count;
  CHAR16  Character;
  UINTN   Start;
  UINTN   End;
  UINTN   Top;
  UINTN   Bottom;
  CHAR16  *String;
  UINTN   DimensionsWidth;
  UINTN   DimensionsHeight;
  UINTN   CurrentAttribute;
  BOOLEAN CursorVisible;

  //
  // If screen dimension info is not ready, get it from console.
  //
  if (gScreenDimensions.RightColumn == 0 || gScreenDimensions.BottomRow == 0) {
    ZeroMem (&gScreenDimensions, sizeof (EFI_SCREEN_DESCRIPTOR));
    gST->ConOut->QueryMode (
                   gST->ConOut,
                   gST->ConOut->Mode->Mode,
                   &gScreenDimensions.RightColumn,
                   &gScreenDimensions.BottomRow
                   );
  }

  DimensionsWidth   = gScreenDimensions.RightColumn - gScreenDimensions.LeftColumn;
  DimensionsHeight  = gScreenDimensions.BottomRow - gScreenDimensions.TopRow;

  LargestString = 0;
  LineNum       = 0;
  VA_START (Marker, Key);
  while  ((String = VA_ARG (Marker, CHAR16 *)) != NULL) {
    LineNum ++;
    
    if ((LibGetStringWidth (String) / 2) > LargestString) {
      LargestString = (LibGetStringWidth (String) / 2);
    }
  } 
  VA_END (Marker);

  if ((LargestString + 2) > DimensionsWidth) {
    LargestString = DimensionsWidth - 2;
  }
  
  CurrentAttribute  = gST->ConOut->Mode->Attribute;
  CursorVisible     = gST->ConOut->Mode->CursorVisible;
  gST->ConOut->EnableCursor (gST->ConOut, FALSE);
  gST->ConOut->SetAttribute (gST->ConOut, GetPopupColor ());

  //
  // Subtract the PopUp width from total Columns, allow for one space extra on
  // each end plus a border.
  //
  Start     = (DimensionsWidth - LargestString - 2) / 2 + gScreenDimensions.LeftColumn + 1;
  End       = Start + LargestString + 1;

  Top       = ((DimensionsHeight - LineNum - 2) / 2) + gScreenDimensions.TopRow - 1;
  Bottom    = Top + LineNum + 2;

  Character = BOXDRAW_DOWN_RIGHT;
  PrintCharAt (Start, Top, Character);
  Character = BOXDRAW_HORIZONTAL;
  for (Index = Start; Index + 2 < End; Index++) {
    PrintCharAt ((UINTN)-1, (UINTN)-1, Character);
  }

  Character = BOXDRAW_DOWN_LEFT;
  PrintCharAt ((UINTN)-1, (UINTN)-1, Character);
  Character = BOXDRAW_VERTICAL;

  Count = 0;
  VA_START (Marker, Key);
  for (Index = Top; Index + 2 < Bottom; Index++, Count++) {
    String = VA_ARG (Marker, CHAR16*);

    if (String[0] == CHAR_NULL) {
      //
      // Passing in a NULL results in a blank space
      //
      ClearLines (Start, End, Index + 1, Index + 1, GetPopupColor ());
    } else if (String[0] == L' ') {
      //
      // Passing in a space results in the assumption that this is where typing will occur
      //
      ClearLines (Start + 1, End - 1, Index + 1, Index + 1, POPUP_INVERSE_TEXT | POPUP_INVERSE_BACKGROUND);
      PrintStringAt (
        ((DimensionsWidth - LibGetStringWidth (String) / 2) / 2) + gScreenDimensions.LeftColumn + 1,
        Index + 1,
        String + 1
        );
    } else {
      //
      // This will clear the background of the line - we never know who might have been
      // here before us.  This differs from the next clear in that it used the non-reverse
      // video for normal printing.
      //
      ClearLines (Start, End, Index + 1, Index + 1, GetPopupColor ());
      PrintStringAt (
        ((DimensionsWidth - LibGetStringWidth (String) / 2) / 2) + gScreenDimensions.LeftColumn + 1,
        Index + 1,
        String
        );
    }

    gST->ConOut->SetAttribute (gST->ConOut, GetPopupColor ());
    PrintCharAt (Start, Index + 1, Character);
    PrintCharAt (End - 1, Index + 1, Character);
  }
  VA_END (Marker);

  Character = BOXDRAW_UP_RIGHT;
  PrintCharAt (Start, Bottom - 1, Character);
  Character = BOXDRAW_HORIZONTAL;
  for (Index = Start; Index + 2 < End; Index++) {
    PrintCharAt ((UINTN)-1, (UINTN) -1, Character);
  }

  Character = BOXDRAW_UP_LEFT;
  PrintCharAt ((UINTN)-1, (UINTN) -1, Character);

  if (Key != NULL) {
    Status = WaitForKeyStroke (&KeyValue);
    ASSERT_EFI_ERROR (Status);
    CopyMem (Key, &KeyValue, sizeof (EFI_INPUT_KEY));
  }

  gST->ConOut->SetAttribute (gST->ConOut, CurrentAttribute);
  gST->ConOut->EnableCursor (gST->ConOut, CursorVisible);
}

/**
  Confirm how to handle the changed data. 
  
  @return Action BROWSER_ACTION_SUBMIT, BROWSER_ACTION_DISCARD or other values.
**/
UINTN
EFIAPI
ConfirmDataChange (
  VOID
  )
{
  CHAR16                  YesResponse;
  CHAR16                  NoResponse;
  EFI_INPUT_KEY           Key;

  gST->ConIn->ReadKeyStroke (gST->ConIn, &Key);
  
  YesResponse = gYesResponse[0];
  NoResponse  = gNoResponse[0];
  
  //
  // If NV flag is up, prompt user
  //
  do {
    CreateDialog (&Key, gLibEmptyString, gSaveChanges, gAreYouSure, gLibEmptyString, NULL);
  } while
  (
    (Key.ScanCode != SCAN_ESC) &&
    ((Key.UnicodeChar | UPPER_LOWER_CASE_OFFSET) != (NoResponse | UPPER_LOWER_CASE_OFFSET)) &&
    ((Key.UnicodeChar | UPPER_LOWER_CASE_OFFSET) != (YesResponse | UPPER_LOWER_CASE_OFFSET))
  );
  
  if (Key.ScanCode == SCAN_ESC) {
    return BROWSER_ACTION_NONE;
  } else if ((Key.UnicodeChar | UPPER_LOWER_CASE_OFFSET) == (YesResponse | UPPER_LOWER_CASE_OFFSET)) {
    return BROWSER_ACTION_SUBMIT;
  } else {
    return BROWSER_ACTION_DISCARD;
  }
}

/**
  OEM specifies whether Setup exits Page by ESC key.

  This function customized the behavior that whether Setup exits Page so that 
  system able to boot when configuration is not changed.

  @retval  TRUE     Exits FrontPage
  @retval  FALSE    Don't exit FrontPage.
**/
BOOLEAN
EFIAPI
FormExitPolicy (
  VOID
  )
{
  return gClassOfVfr == FORMSET_CLASS_FRONT_PAGE ? FALSE : TRUE;
}

/**
  Set Timeout value for a ceratain Form to get user response. 
  
  This function allows to set timeout value on a ceratain form if necessary.
  If timeout is not zero, the form will exit if user has no response in timeout. 
  
  @param[in]  FormData   Form Data to be shown in Page

  @return 0     No timeout for this form. 
  @return > 0   Timeout value in 100 ns units.
**/
UINT64
EFIAPI
FormExitTimeout (
  IN FORM_DISPLAY_ENGINE_FORM      *FormData
  )
{
  return 0;
}
//
// Print Functions
//
/**
  Prints a unicode string to the default console, at
  the supplied cursor position, using L"%s" format.

  @param  Column     The cursor position to print the string at. When it is -1, use current Position.
  @param  Row        The cursor position to print the string at. When it is -1, use current Position.
  @param  String     String pointer.

  @return Length of string printed to the console

**/
UINTN
EFIAPI
PrintStringAt (
  IN UINTN     Column,
  IN UINTN     Row,
  IN CHAR16    *String
  )
{
  return PrintAt (0, Column, Row, L"%s", String);
}

/**
  Prints a unicode string to the default console, at
  the supplied cursor position, using L"%s" format.

  @param  Column     The cursor position to print the string at. When it is -1, use current Position.
  @param  Row        The cursor position to print the string at. When it is -1, use current Position.
  @param  String     String pointer.
  @param  Width      Width for String.

  @return Length of string printed to the console

**/
UINTN
EFIAPI
PrintStringAtWithWidth (
  IN UINTN     Column,
  IN UINTN     Row,
  IN CHAR16    *String,
  IN UINTN     Width
  )
{
  return PrintAt (Width, Column, Row, L"%s", String);
}

/**
  Prints a chracter to the default console, at
  the supplied cursor position, using L"%c" format.

  @param  Column     The cursor position to print the string at. When it is -1, use current Position.
  @param  Row        The cursor position to print the string at. When it is -1, use current Position.
  @param  Character  Character to print.

  @return Length of string printed to the console.

**/
UINTN
EFIAPI
PrintCharAt (
  IN UINTN     Column,
  IN UINTN     Row,
  CHAR16       Character
  )
{
  return PrintAt (0, Column, Row, L"%c", Character);
}

/**
  Clear retangle with specified text attribute.

  @param  LeftColumn     Left column of retangle.
  @param  RightColumn    Right column of retangle.
  @param  TopRow         Start row of retangle.
  @param  BottomRow      End row of retangle.
  @param  TextAttribute  The character foreground and background.

**/
VOID
EFIAPI
ClearLines (
  IN UINTN               LeftColumn,
  IN UINTN               RightColumn,
  IN UINTN               TopRow,
  IN UINTN               BottomRow,
  IN UINTN               TextAttribute
  )
{
  CHAR16  *Buffer;
  UINTN   Row;

  //
  // For now, allocate an arbitrarily long buffer
  //
  Buffer = AllocateZeroPool (0x10000);
  ASSERT (Buffer != NULL);

  //
  // Set foreground and background as defined
  //
  gST->ConOut->SetAttribute (gST->ConOut, TextAttribute);

  //
  // Much faster to buffer the long string instead of print it a character at a time
  //
  LibSetUnicodeMem (Buffer, RightColumn - LeftColumn, L' ');

  //
  // Clear the desired area with the appropriate foreground/background
  //
  for (Row = TopRow; Row <= BottomRow; Row++) {
    PrintStringAt (LeftColumn, Row, Buffer);
  }

  gST->ConOut->SetCursorPosition (gST->ConOut, LeftColumn, TopRow);

  FreePool (Buffer);
}

//
// Color Setting Functions
//

/**
  Get OEM/Vendor specific popup attribute colors.

  @retval  Byte code color setting for popup color.
**/
UINT8
EFIAPI
GetPopupColor (
  VOID
  )
{
  return POPUP_TEXT | POPUP_BACKGROUND;
}

/**
  Get OEM/Vendor specific popup attribute colors.

  @retval  Byte code color setting for popup inverse color.
**/
UINT8
EFIAPI
GetPopupInverseColor (
  VOID
  )
{
  return POPUP_INVERSE_TEXT | POPUP_INVERSE_BACKGROUND;
}

/**
  Get OEM/Vendor specific PickList color attribute.

  @retval  Byte code color setting for pick list color.
**/
UINT8
EFIAPI
GetPickListColor (
  VOID
  )
{
  return PICKLIST_HIGHLIGHT_TEXT | PICKLIST_HIGHLIGHT_BACKGROUND;
}

/**
  Get OEM/Vendor specific arrow color attribute.

  @retval  Byte code color setting for arrow color.
**/
UINT8
EFIAPI
GetArrowColor (
  VOID
  )
{
  return ARROW_TEXT | ARROW_BACKGROUND;
}

/**
  Get OEM/Vendor specific info text color attribute.

  @retval  Byte code color setting for info text color.
**/
UINT8
EFIAPI
GetInfoTextColor (
  VOID
  )
{
  return INFO_TEXT | FIELD_BACKGROUND;
}

/**
  Get OEM/Vendor specific help text color attribute.

  @retval  Byte code color setting for help text color.
**/
UINT8
EFIAPI
GetHelpTextColor (
  VOID
  )
{
  return HELP_TEXT | FIELD_BACKGROUND;
}

/**
  Get OEM/Vendor specific grayed out text color attribute.

  @retval  Byte code color setting for grayed out text color.
**/
UINT8
EFIAPI
GetGrayedTextColor (
  VOID
  )
{
  return FIELD_TEXT_GRAYED | FIELD_BACKGROUND;
}

/**
  Get OEM/Vendor specific highlighted text color attribute.

  @retval  Byte code color setting for highlight text color.
**/
UINT8
EFIAPI
GetHighlightTextColor (
  VOID
  )
{
  return PcdGet8 (PcdBrowserFieldTextHighlightColor) | PcdGet8 (PcdBrowserFieldBackgroundHighlightColor);
}

/**
  Get OEM/Vendor specific field text color attribute.

  @retval  Byte code color setting for field text color.
**/
UINT8
EFIAPI
GetFieldTextColor (
  VOID
  )
{
  return PcdGet8 (PcdBrowserFieldTextColor) | FIELD_BACKGROUND;
}

/**
  Get OEM/Vendor specific subtitle text color attribute.

  @retval  Byte code color setting for subtitle text color.
**/
UINT8
EFIAPI
GetSubTitleTextColor (
  VOID
  )
{
  return PcdGet8 (PcdBrowserSubtitleTextColor) | FIELD_BACKGROUND;
}

/**
  Clear Screen to the initial state.
**/
VOID
EFIAPI 
ClearDisplayPage (
  VOID
  )
{
  gST->ConOut->SetAttribute (gST->ConOut, EFI_TEXT_ATTR (EFI_LIGHTGRAY, EFI_BLACK));
  gST->ConOut->ClearScreen (gST->ConOut);
  gLibIsFirstForm = TRUE;
}

/**
  Constructor of Customized Display Library Instance.

  @param  ImageHandle   The firmware allocated handle for the EFI image.
  @param  SystemTable   A pointer to the EFI System Table.

  @retval EFI_SUCCESS   The constructor always returns EFI_SUCCESS.

**/
EFI_STATUS
EFIAPI
CustomizedDisplayLibConstructor (
  IN      EFI_HANDLE                ImageHandle,
  IN      EFI_SYSTEM_TABLE          *SystemTable
  )
{
  mCDLStringPackHandle = HiiAddPackages (&gCustomizedDisplayLibGuid, ImageHandle, CustomizedDisplayLibStrings, NULL);
  ASSERT (mCDLStringPackHandle != NULL);

  InitializeLibStrings();

  return EFI_SUCCESS;
}

/**
  Destructor of Customized Display Library Instance.

  @param  ImageHandle   The firmware allocated handle for the EFI image.
  @param  SystemTable   A pointer to the EFI System Table.

  @retval EFI_SUCCESS   The destructor completed successfully.
  @retval Other value   The destructor did not complete successfully.

**/
EFI_STATUS
EFIAPI
CustomizedDisplayLibDestructor (
  IN EFI_HANDLE        ImageHandle,
  IN EFI_SYSTEM_TABLE  *SystemTable
  )
{
  HiiRemovePackages(mCDLStringPackHandle);
  
  FreeLibStrings ();

  return EFI_SUCCESS;
}