/** @file

  This library class defines a set of interfaces to customize Display module

Copyright (c) 2013 - 2018, Intel Corporation. All rights reserved.<BR>
SPDX-License-Identifier: BSD-2-Clause-Patent

**/
#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);
    if (!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 character 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);
  if (!Buffer) {
    return;
  }

  //
  // 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;
}