MdeModulePkg/Universal/SetupBrowserDxe/InputHandler.c

   1 /** @file
   2 Implementation for handling user input from the User Interfaces.
   3
   4 Copyright (c) 2004 - 2007, Intel Corporation
   5 All rights reserved. This program and the accompanying materials
   6 are licensed and made available under the terms and conditions of the BSD License
   7 which accompanies this distribution.  The full text of the license may be found at
   8 http://opensource.org/licenses/bsd-license.php
   9
  10 THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
  11 WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
  12
  13 **/
  14
  15 #include "Ui.h"
  16 #include "Setup.h"
  17
  18
  19 /**
  20   Get string or password input from user.
  21
  22   @param  MenuOption        Pointer to the current input menu.
  23   @param  Prompt            The prompt string shown on popup window.
  24   @param  StringPtr         Destination for use input string.
  25
  26   @retval EFI_SUCCESS       If string input is read successfully
  27   @retval EFI_DEVICE_ERROR  If operation fails
  28
  29 **/
  30 EFI_STATUS
  31 ReadString (
  32   IN  UI_MENU_OPTION              *MenuOption,
  33   IN  CHAR16                      *Prompt,
  34   OUT CHAR16                      *StringPtr
  35   )
  36 {
  37   EFI_STATUS              Status;
  38   EFI_INPUT_KEY           Key;
  39   CHAR16                  NullCharacter;
  40   UINTN                   ScreenSize;
  41   CHAR16                  Space[2];
  42   CHAR16                  KeyPad[2];
  43   CHAR16                  *TempString;
  44   CHAR16                  *BufferedString;
  45   UINTN                   Index;
  46   UINTN                   Count;
  47   UINTN                   Start;
  48   UINTN                   Top;
  49   UINTN                   DimensionsWidth;
  50   UINTN                   DimensionsHeight;
  51   BOOLEAN                 CursorVisible;
  52   UINTN                   Minimum;
  53   UINTN                   Maximum;
  54   FORM_BROWSER_STATEMENT  *Question;
  55   BOOLEAN                 IsPassword;
  56
  57   DimensionsWidth  = gScreenDimensions.RightColumn - gScreenDimensions.LeftColumn;
  58   DimensionsHeight = gScreenDimensions.BottomRow - gScreenDimensions.TopRow;
  59
  60   NullCharacter    = CHAR_NULL;
  61   ScreenSize       = GetStringWidth (Prompt) / sizeof (CHAR16);
  62   Space[0]         = L' ';
  63   Space[1]         = CHAR_NULL;
  64
  65   Question         = MenuOption->ThisTag;
  66   Minimum          = (UINTN) Question->Minimum;
  67   Maximum          = (UINTN) Question->Maximum;
  68
  69   if (Question->Operand == EFI_IFR_PASSWORD_OP) {
  70     IsPassword = TRUE;
  71   } else {
  72     IsPassword = FALSE;
  73   }
  74
  75   TempString = AllocateZeroPool ((Maximum + 1)* sizeof (CHAR16));
  76   ASSERT (TempString);
  77
  78   if (ScreenSize < (Maximum + 1)) {
  79     ScreenSize = Maximum + 1;
  80   }
  81
  82   if ((ScreenSize + 2) > DimensionsWidth) {
  83     ScreenSize = DimensionsWidth - 2;
  84   }
  85
  86   BufferedString = AllocateZeroPool (ScreenSize * 2);
  87   ASSERT (BufferedString);
  88
  89   Start = (DimensionsWidth - ScreenSize - 2) / 2 + gScreenDimensions.LeftColumn + 1;
  90   Top   = ((DimensionsHeight - 6) / 2) + gScreenDimensions.TopRow - 1;
  91
  92   //
  93   // Display prompt for string
  94   //
  95   CreatePopUp (ScreenSize, 4, &NullCharacter, Prompt, Space, &NullCharacter);
  96
  97   gST->ConOut->SetAttribute (gST->ConOut, EFI_TEXT_ATTR (EFI_BLACK, EFI_LIGHTGRAY));
  98
  99   CursorVisible = gST->ConOut->Mode->CursorVisible;
 100   gST->ConOut->EnableCursor (gST->ConOut, TRUE);
 101
 102   do {
 103     Status = WaitForKeyStroke (&Key);
 104     ASSERT_EFI_ERROR (Status);
 105
 106     gST->ConOut->SetAttribute (gST->ConOut, EFI_TEXT_ATTR (EFI_BLACK, EFI_LIGHTGRAY));
 107     switch (Key.UnicodeChar) {
 108     case CHAR_NULL:
 109       switch (Key.ScanCode) {
 110       case SCAN_LEFT:
 111         break;
 112
 113       case SCAN_RIGHT:
 114         break;
 115
 116       case SCAN_ESC:
 117         FreePool (TempString);
 118         FreePool (BufferedString);
 119         gST->ConOut->SetAttribute (gST->ConOut, EFI_TEXT_ATTR (EFI_LIGHTGRAY, EFI_BLACK));
 120         gST->ConOut->EnableCursor (gST->ConOut, CursorVisible);
 121         return EFI_DEVICE_ERROR;
 122
 123       default:
 124         break;
 125       }
 126
 127       break;
 128
 129     case CHAR_CARRIAGE_RETURN:
 130       if (GetStringWidth (StringPtr) >= ((Minimum + 1) * sizeof (CHAR16))) {
 131
 132         FreePool (TempString);
 133         FreePool (BufferedString);
 134         gST->ConOut->SetAttribute (gST->ConOut, EFI_TEXT_ATTR (EFI_LIGHTGRAY, EFI_BLACK));
 135         gST->ConOut->EnableCursor (gST->ConOut, CursorVisible);
 136         return EFI_SUCCESS;
 137       } else {
 138         //
 139         // Simply create a popup to tell the user that they had typed in too few characters.
 140         // To save code space, we can then treat this as an error and return back to the menu.
 141         //
 142         do {
 143           CreateDialog (4, TRUE, 0, NULL, &Key, &NullCharacter, gMiniString, gPressEnter, &NullCharacter);
 144         } while (Key.UnicodeChar != CHAR_CARRIAGE_RETURN);
 145
 146         FreePool (TempString);
 147         FreePool (BufferedString);
 148         gST->ConOut->SetAttribute (gST->ConOut, EFI_TEXT_ATTR (EFI_LIGHTGRAY, EFI_BLACK));
 149         gST->ConOut->EnableCursor (gST->ConOut, CursorVisible);
 150         return EFI_DEVICE_ERROR;
 151       }
 152
 153       break;
 154
 155     case CHAR_BACKSPACE:
 156       if (StringPtr[0] != CHAR_NULL) {
 157         for (Index = 0; StringPtr[Index] != CHAR_NULL; Index++) {
 158           TempString[Index] = StringPtr[Index];
 159         }
 160         //
 161         // Effectively truncate string by 1 character
 162         //
 163         TempString[Index - 1] = CHAR_NULL;
 164         StrCpy (StringPtr, TempString);
 165       }
 166
 167     default:
 168       //
 169       // If it is the beginning of the string, don't worry about checking maximum limits
 170       //
 171       if ((StringPtr[0] == CHAR_NULL) && (Key.UnicodeChar != CHAR_BACKSPACE)) {
 172         StrnCpy (StringPtr, &Key.UnicodeChar, 1);
 173         StrnCpy (TempString, &Key.UnicodeChar, 1);
 174       } else if ((GetStringWidth (StringPtr) < ((Maximum + 1) * sizeof (CHAR16))) && (Key.UnicodeChar != CHAR_BACKSPACE)) {
 175         KeyPad[0] = Key.UnicodeChar;
 176         KeyPad[1] = CHAR_NULL;
 177         StrCat (StringPtr, KeyPad);
 178         StrCat (TempString, KeyPad);
 179       }
 180
 181       //
 182       // If the width of the input string is now larger than the screen, we nee to
 183       // adjust the index to start printing portions of the string
 184       //
 185       SetUnicodeMem (BufferedString, ScreenSize - 1, L' ');
 186       PrintStringAt (Start + 1, Top + 3, BufferedString);
 187
 188       if ((GetStringWidth (StringPtr) / 2) > (DimensionsWidth - 2)) {
 189         Index = (GetStringWidth (StringPtr) / 2) - DimensionsWidth + 2;
 190       } else {
 191         Index = 0;
 192       }
 193
 194       if (IsPassword) {
 195         gST->ConOut->SetCursorPosition (gST->ConOut, Start + 1, Top + 3);
 196       }
 197
 198       for (Count = 0; Index + 1 < GetStringWidth (StringPtr) / 2; Index++, Count++) {
 199         BufferedString[Count] = StringPtr[Index];
 200
 201         if (IsPassword) {
 202           PrintChar (L'*');
 203         }
 204       }
 205
 206       if (!IsPassword) {
 207         PrintStringAt (Start + 1, Top + 3, BufferedString);
 208       }
 209       break;
 210     }
 211
 212     gST->ConOut->SetAttribute (gST->ConOut, EFI_TEXT_ATTR (EFI_LIGHTGRAY, EFI_BLACK));
 213     gST->ConOut->SetCursorPosition (gST->ConOut, Start + GetStringWidth (StringPtr) / 2, Top + 3);
 214   } while (TRUE);
 215
 216 }
 217
 218
 219 /**
 220   This routine reads a numeric value from the user input.
 221
 222   @param  Selection         Pointer to current selection.
 223   @param  MenuOption        Pointer to the current input menu.
 224
 225   @retval EFI_SUCCESS       If numerical input is read successfully
 226   @retval EFI_DEVICE_ERROR  If operation fails
 227
 228 **/
 229 EFI_STATUS
 230 GetNumericInput (
 231   IN  UI_MENU_SELECTION           *Selection,
 232   IN  UI_MENU_OPTION              *MenuOption
 233   )
 234 {
 235   EFI_STATUS              Status;
 236   UINTN                   Column;
 237   UINTN                   Row;
 238   CHAR16                  InputText[MAX_NUMERIC_INPUT_WIDTH];
 239   CHAR16                  FormattedNumber[MAX_NUMERIC_INPUT_WIDTH - 1];
 240   UINT64                  PreviousNumber[MAX_NUMERIC_INPUT_WIDTH - 3];
 241   UINTN                   Count;
 242   UINTN                   Loop;
 243   BOOLEAN                 ManualInput;
 244   BOOLEAN                 HexInput;
 245   BOOLEAN                 DateOrTime;
 246   UINTN                   InputWidth;
 247   UINT64                  EditValue;
 248   UINT64                  Step;
 249   UINT64                  Minimum;
 250   UINT64                  Maximum;
 251   UINTN                   EraseLen;
 252   UINT8                   Digital;
 253   EFI_INPUT_KEY           Key;
 254   EFI_HII_VALUE           *QuestionValue;
 255   FORM_BROWSER_FORM       *Form;
 256   FORM_BROWSER_FORMSET    *FormSet;
 257   FORM_BROWSER_STATEMENT  *Question;
 258
 259   Column            = MenuOption->OptCol;
 260   Row               = MenuOption->Row;
 261   PreviousNumber[0] = 0;
 262   Count             = 0;
 263   InputWidth        = 0;
 264   Digital           = 0;
 265
 266   FormSet       = Selection->FormSet;
 267   Form          = Selection->Form;
 268   Question      = MenuOption->ThisTag;
 269   QuestionValue = &Question->HiiValue;
 270   Step          = Question->Step;
 271   Minimum       = Question->Minimum;
 272   Maximum       = Question->Maximum;
 273
 274   if ((Question->Operand == EFI_IFR_DATE_OP) || (Question->Operand == EFI_IFR_TIME_OP)) {
 275     DateOrTime = TRUE;
 276   } else {
 277     DateOrTime = FALSE;
 278   }
 279
 280   //
 281   // Prepare Value to be edit
 282   //
 283   EraseLen = 0;
 284   EditValue = 0;
 285   if (Question->Operand == EFI_IFR_DATE_OP) {
 286     Step = 1;
 287     Minimum = 1;
 288
 289     switch (MenuOption->Sequence) {
 290     case 0:
 291       Maximum = 12;
 292       EraseLen = 4;
 293       EditValue = QuestionValue->Value.date.Month;
 294       break;
 295
 296     case 1:
 297       Maximum = 31;
 298       EraseLen = 3;
 299       EditValue = QuestionValue->Value.date.Day;
 300       break;
 301
 302     case 2:
 303       Maximum = 0xffff;
 304       EraseLen = 5;
 305       EditValue = QuestionValue->Value.date.Year;
 306       break;
 307
 308     default:
 309       break;
 310     }
 311   } else if (Question->Operand == EFI_IFR_TIME_OP) {
 312     Step = 1;
 313     Minimum = 0;
 314
 315     switch (MenuOption->Sequence) {
 316     case 0:
 317       Maximum = 23;
 318       EraseLen = 4;
 319       EditValue = QuestionValue->Value.time.Hour;
 320       break;
 321
 322     case 1:
 323       Maximum = 59;
 324       EraseLen = 3;
 325       EditValue = QuestionValue->Value.time.Minute;
 326       break;
 327
 328     case 2:
 329       Maximum = 59;
 330       EraseLen = 3;
 331       EditValue = QuestionValue->Value.time.Second;
 332       break;
 333
 334     default:
 335       break;
 336     }
 337   } else {
 338     //
 339     // Numeric
 340     //
 341     EraseLen = gOptionBlockWidth;
 342     EditValue = QuestionValue->Value.u64;
 343     if (Maximum == 0) {
 344       Maximum = (UINT64) -1;
 345     }
 346   }
 347
 348   if (Step == 0) {
 349     ManualInput = TRUE;
 350   } else {
 351     ManualInput = FALSE;
 352   }
 353
 354   if ((Question->Operand == EFI_IFR_NUMERIC_OP) &&
 355       ((Question->Flags & EFI_IFR_DISPLAY) == EFI_IFR_DISPLAY_UINT_HEX)) {
 356     HexInput = TRUE;
 357   } else {
 358     HexInput = FALSE;
 359   }
 360
 361   if (ManualInput) {
 362     if (HexInput) {
 363       InputWidth = Question->StorageWidth * 2;
 364     } else {
 365       switch (Question->StorageWidth) {
 366       case 1:
 367         InputWidth = 3;
 368         break;
 369
 370       case 2:
 371         InputWidth = 5;
 372         break;
 373
 374       case 4:
 375         InputWidth = 10;
 376         break;
 377
 378       case 8:
 379         InputWidth = 20;
 380         break;
 381
 382       default:
 383         InputWidth = 0;
 384         break;
 385       }
 386     }
 387
 388     InputText[0] = LEFT_NUMERIC_DELIMITER;
 389     SetUnicodeMem (InputText + 1, InputWidth, L' ');
 390     ASSERT (InputWidth + 2 < MAX_NUMERIC_INPUT_WIDTH);
 391     InputText[InputWidth + 1] = RIGHT_NUMERIC_DELIMITER;
 392     InputText[InputWidth + 2] = L'\0';
 393
 394     PrintAt (Column, Row, InputText);
 395     Column++;
 396   }
 397
 398   //
 399   // First time we enter this handler, we need to check to see if
 400   // we were passed an increment or decrement directive
 401   //
 402   do {
 403     Key.UnicodeChar = CHAR_NULL;
 404     if (gDirection != 0) {
 405       Key.ScanCode  = gDirection;
 406       gDirection    = 0;
 407       goto TheKey2;
 408     }
 409
 410     Status = WaitForKeyStroke (&Key);
 411
 412 TheKey2:
 413     switch (Key.UnicodeChar) {
 414
 415     case '+':
 416     case '-':
 417       if (Key.UnicodeChar == '+') {
 418         Key.ScanCode = SCAN_RIGHT;
 419       } else {
 420         Key.ScanCode = SCAN_LEFT;
 421       }
 422       Key.UnicodeChar = CHAR_NULL;
 423       goto TheKey2;
 424
 425     case CHAR_NULL:
 426       switch (Key.ScanCode) {
 427       case SCAN_LEFT:
 428       case SCAN_RIGHT:
 429         if (DateOrTime) {
 430           //
 431           // By setting this value, we will return back to the caller.
 432           // We need to do this since an auto-refresh will destroy the adjustment
 433           // based on what the real-time-clock is showing.  So we always commit
 434           // upon changing the value.
 435           //
 436           gDirection = SCAN_DOWN;
 437         }
 438
 439         if (!ManualInput) {
 440           if (Key.ScanCode == SCAN_LEFT) {
 441             if (EditValue > Step) {
 442               EditValue = EditValue - Step;
 443             } else {
 444               EditValue = Minimum;
 445             }
 446           } else if (Key.ScanCode == SCAN_RIGHT) {
 447             EditValue = EditValue + Step;
 448             if (EditValue > Maximum) {
 449               EditValue = Maximum;
 450             }
 451           }
 452
 453           ZeroMem (FormattedNumber, 21 * sizeof (CHAR16));
 454           if (Question->Operand == EFI_IFR_DATE_OP) {
 455             if (MenuOption->Sequence == 2) {
 456               //
 457               // Year
 458               //
 459               UnicodeSPrint (FormattedNumber, 21 * sizeof (CHAR16), L"%04d", EditValue);
 460             } else {
 461               //
 462               // Month/Day
 463               //
 464               UnicodeSPrint (FormattedNumber, 21 * sizeof (CHAR16), L"%02d", EditValue);
 465             }
 466
 467             if (MenuOption->Sequence == 0) {
 468               FormattedNumber[EraseLen - 2] = DATE_SEPARATOR;
 469             } else if (MenuOption->Sequence == 1) {
 470               FormattedNumber[EraseLen - 1] = DATE_SEPARATOR;
 471             }
 472           } else if (Question->Operand == EFI_IFR_TIME_OP) {
 473             UnicodeSPrint (FormattedNumber, 21 * sizeof (CHAR16), L"%02d", EditValue);
 474
 475             if (MenuOption->Sequence == 0) {
 476               FormattedNumber[EraseLen - 2] = TIME_SEPARATOR;
 477             } else if (MenuOption->Sequence == 1) {
 478               FormattedNumber[EraseLen - 1] = TIME_SEPARATOR;
 479             }
 480           } else {
 481             QuestionValue->Value.u64 = EditValue;
 482             PrintFormattedNumber (Question, FormattedNumber, 21 * sizeof (CHAR16));
 483           }
 484
 485           gST->ConOut->SetAttribute (gST->ConOut, FIELD_TEXT | FIELD_BACKGROUND);
 486           for (Loop = 0; Loop < EraseLen; Loop++) {
 487             PrintAt (MenuOption->OptCol + Loop, MenuOption->Row, L" ");
 488           }
 489           gST->ConOut->SetAttribute (gST->ConOut, FIELD_TEXT_HIGHLIGHT | FIELD_BACKGROUND_HIGHLIGHT);
 490
 491           if (MenuOption->Sequence == 0) {
 492             PrintCharAt (MenuOption->OptCol, Row, LEFT_NUMERIC_DELIMITER);
 493             Column = MenuOption->OptCol + 1;
 494           }
 495
 496           PrintStringAt (Column, Row, FormattedNumber);
 497
 498           if (!DateOrTime || MenuOption->Sequence == 2) {
 499             PrintChar (RIGHT_NUMERIC_DELIMITER);
 500           }
 501         }
 502
 503         goto EnterCarriageReturn;
 504         break;
 505
 506       case SCAN_UP:
 507       case SCAN_DOWN:
 508         goto EnterCarriageReturn;
 509
 510       case SCAN_ESC:
 511         return EFI_DEVICE_ERROR;
 512
 513       default:
 514         break;
 515       }
 516
 517       break;
 518
 519 EnterCarriageReturn:
 520
 521     case CHAR_CARRIAGE_RETURN:
 522       //
 523       // Store Edit value back to Question
 524       //
 525       if (Question->Operand == EFI_IFR_DATE_OP) {
 526         switch (MenuOption->Sequence) {
 527         case 0:
 528           QuestionValue->Value.date.Month = (UINT8) EditValue;
 529           break;
 530
 531         case 1:
 532           QuestionValue->Value.date.Day = (UINT8) EditValue;
 533           break;
 534
 535         case 2:
 536           QuestionValue->Value.date.Year = (UINT16) EditValue;
 537           break;
 538
 539         default:
 540           break;
 541         }
 542       } else if (Question->Operand == EFI_IFR_TIME_OP) {
 543         switch (MenuOption->Sequence) {
 544         case 0:
 545           QuestionValue->Value.time.Hour = (UINT8) EditValue;
 546           break;
 547
 548         case 1:
 549           QuestionValue->Value.time.Minute = (UINT8) EditValue;
 550           break;
 551
 552         case 2:
 553           QuestionValue->Value.time.Second = (UINT8) EditValue;
 554           break;
 555
 556         default:
 557           break;
 558         }
 559       } else {
 560         //
 561         // Numeric
 562         //
 563         QuestionValue->Value.u64 = EditValue;
 564       }
 565
 566       //
 567       // Check to see if the Value is something reasonable against consistency limitations.
 568       // If not, let's kick the error specified.
 569       //
 570       Status = ValidateQuestion (FormSet, Form, Question, EFI_HII_EXPRESSION_INCONSISTENT_IF);
 571       if (EFI_ERROR (Status)) {
 572         //
 573         // Input value is not valid, restore Question Value
 574         //
 575         GetQuestionValue (FormSet, Form, Question, TRUE);
 576       } else {
 577         SetQuestionValue (FormSet, Form, Question, TRUE);
 578         if (!DateOrTime || (Question->Storage != NULL)) {
 579           //
 580           // NV flag is unnecessary for RTC type of Date/Time
 581           //
 582           UpdateStatusBar (NV_UPDATE_REQUIRED, Question->QuestionFlags, TRUE);
 583         }
 584       }
 585
 586       return Status;
 587       break;
 588
 589     case CHAR_BACKSPACE:
 590       if (ManualInput) {
 591         if (Count == 0) {
 592           break;
 593         }
 594         //
 595         // Remove a character
 596         //
 597         EditValue = PreviousNumber[Count - 1];
 598         UpdateStatusBar (INPUT_ERROR, Question->QuestionFlags, FALSE);
 599         Count--;
 600         Column--;
 601         PrintAt (Column, Row, L" ");
 602       }
 603       break;
 604
 605     default:
 606       if (ManualInput) {
 607         if (HexInput) {
 608           if (!IsHexDigit (&Digital, Key.UnicodeChar)) {
 609             UpdateStatusBar (INPUT_ERROR, Question->QuestionFlags, TRUE);
 610             break;
 611           }
 612         } else {
 613           if (Key.UnicodeChar > L'9' || Key.UnicodeChar < L'0') {
 614             UpdateStatusBar (INPUT_ERROR, Question->QuestionFlags, TRUE);
 615             break;
 616           }
 617         }
 618
 619         //
 620         // If Count exceed input width, there is no way more is valid
 621         //
 622         if (Count >= InputWidth) {
 623           break;
 624         }
 625         //
 626         // Someone typed something valid!
 627         //
 628         if (Count != 0) {
 629           if (HexInput) {
 630             EditValue = LShiftU64 (EditValue, 4) + Digital;
 631           } else {
 632             EditValue = MultU64x32 (EditValue, 10) + (Key.UnicodeChar - L'0');
 633           }
 634         } else {
 635           if (HexInput) {
 636             EditValue = Digital;
 637           } else {
 638             EditValue = Key.UnicodeChar - L'0';
 639           }
 640         }
 641
 642         if (EditValue > Maximum) {
 643           UpdateStatusBar (INPUT_ERROR, Question->QuestionFlags, TRUE);
 644           ASSERT (Count < sizeof (PreviousNumber) / sizeof (PreviousNumber[0]));
 645           EditValue = PreviousNumber[Count];
 646           break;
 647         } else {
 648           UpdateStatusBar (INPUT_ERROR, Question->QuestionFlags, FALSE);
 649         }
 650
 651         Count++;
 652         ASSERT (Count < (sizeof (PreviousNumber) / sizeof (PreviousNumber[0])));
 653         PreviousNumber[Count] = EditValue;
 654
 655         PrintCharAt (Column, Row, Key.UnicodeChar);
 656         Column++;
 657       }
 658       break;
 659     }
 660   } while (TRUE);
 661
 662 }
 663
 664
 665 /**
 666   Get selection for OneOf and OrderedList (Left/Right will be ignored).
 667
 668   @param  Selection         Pointer to current selection.
 669   @param  MenuOption        Pointer to the current input menu.
 670
 671   @retval EFI_SUCCESS       If Option input is processed successfully
 672   @retval EFI_DEVICE_ERROR  If operation fails
 673
 674 **/
 675 EFI_STATUS
 676 GetSelectionInputPopUp (
 677   IN  UI_MENU_SELECTION           *Selection,
 678   IN  UI_MENU_OPTION              *MenuOption
 679   )
 680 {
 681   EFI_STATUS              Status;
 682   EFI_INPUT_KEY           Key;
 683   UINTN                   Index;
 684   CHAR16                  *StringPtr;
 685   CHAR16                  *TempStringPtr;
 686   UINTN                   Index2;
 687   UINTN                   TopOptionIndex;
 688   UINTN                   HighlightOptionIndex;
 689   UINTN                   Start;
 690   UINTN                   End;
 691   UINTN                   Top;
 692   UINTN                   Bottom;
 693   UINTN                   PopUpMenuLines;
 694   UINTN                   MenuLinesInView;
 695   UINTN                   PopUpWidth;
 696   CHAR16                  Character;
 697   INT32                   SavedAttribute;
 698   BOOLEAN                 ShowDownArrow;
 699   BOOLEAN                 ShowUpArrow;
 700   UINTN                   DimensionsWidth;
 701   LIST_ENTRY              *Link;
 702   BOOLEAN                 OrderedList;
 703   UINT8                   *ValueArray;
 704   EFI_HII_VALUE           HiiValue;
 705   EFI_HII_VALUE           *HiiValueArray;
 706   UINTN                   OptionCount;
 707   QUESTION_OPTION         *OneOfOption;
 708   QUESTION_OPTION         *CurrentOption;
 709   FORM_BROWSER_STATEMENT  *Question;
 710
 711   DimensionsWidth   = gScreenDimensions.RightColumn - gScreenDimensions.LeftColumn;
 712
 713   ValueArray        = NULL;
 714   CurrentOption     = NULL;
 715   ShowDownArrow     = FALSE;
 716   ShowUpArrow       = FALSE;
 717
 718   StringPtr = AllocateZeroPool ((gOptionBlockWidth + 1) * 2);
 719   ASSERT (StringPtr);
 720
 721   Question = MenuOption->ThisTag;
 722   if (Question->Operand == EFI_IFR_ORDERED_LIST_OP) {
 723     ValueArray = Question->BufferValue;
 724     OrderedList = TRUE;
 725   } else {
 726     OrderedList = FALSE;
 727   }
 728
 729   //
 730   // Calculate Option count
 731   //
 732   if (OrderedList) {
 733     for (Index = 0; Index < Question->MaxContainers; Index++) {
 734       if (ValueArray[Index] == 0) {
 735         break;
 736       }
 737     }
 738
 739     OptionCount = Index;
 740   } else {
 741     OptionCount = 0;
 742     Link = GetFirstNode (&Question->OptionListHead);
 743     while (!IsNull (&Question->OptionListHead, Link)) {
 744       OneOfOption = QUESTION_OPTION_FROM_LINK (Link);
 745
 746       OptionCount++;
 747
 748       Link = GetNextNode (&Question->OptionListHead, Link);
 749     }
 750   }
 751
 752   //
 753   // Prepare HiiValue array
 754   //
 755   HiiValueArray = AllocateZeroPool (OptionCount * sizeof (EFI_HII_VALUE));
 756   ASSERT (HiiValueArray != NULL);
 757   Link = GetFirstNode (&Question->OptionListHead);
 758   for (Index = 0; Index < OptionCount; Index++) {
 759     if (OrderedList) {
 760       HiiValueArray[Index].Type = EFI_IFR_TYPE_NUM_SIZE_8;
 761       HiiValueArray[Index].Value.u8 = ValueArray[Index];
 762     } else {
 763       OneOfOption = QUESTION_OPTION_FROM_LINK (Link);
 764       CopyMem (&HiiValueArray[Index], &OneOfOption->Value, sizeof (EFI_HII_VALUE));
 765       Link = GetNextNode (&Question->OptionListHead, Link);
 766     }
 767   }
 768
 769   //
 770   // Move Suppressed Option to list tail
 771   //
 772   PopUpMenuLines = 0;
 773   for (Index = 0; Index < OptionCount; Index++) {
 774     OneOfOption = ValueToOption (Question, &HiiValueArray[OptionCount - Index - 1]);
 775     if (OneOfOption == NULL) {
 776       return EFI_NOT_FOUND;
 777     }
 778
 779     RemoveEntryList (&OneOfOption->Link);
 780
 781     if ((OneOfOption->SuppressExpression != NULL) &&
 782         (OneOfOption->SuppressExpression->Result.Value.b)) {
 783       //
 784       // This option is suppressed, insert to tail
 785       //
 786       InsertTailList (&Question->OptionListHead, &OneOfOption->Link);
 787     } else {
 788       //
 789       // Insert to head
 790       //
 791       InsertHeadList (&Question->OptionListHead, &OneOfOption->Link);
 792
 793       PopUpMenuLines++;
 794     }
 795   }
 796
 797   //
 798   // Get the number of one of options present and its size
 799   //
 800   PopUpWidth = 0;
 801   HighlightOptionIndex = 0;
 802   Link = GetFirstNode (&Question->OptionListHead);
 803   for (Index = 0; Index < PopUpMenuLines; Index++) {
 804     OneOfOption = QUESTION_OPTION_FROM_LINK (Link);
 805
 806     StringPtr = GetToken (OneOfOption->Text, MenuOption->Handle);
 807     if (StrLen (StringPtr) > PopUpWidth) {
 808       PopUpWidth = StrLen (StringPtr);
 809     }
 810     FreePool (StringPtr);
 811
 812     if (!OrderedList && CompareHiiValue (&Question->HiiValue, &OneOfOption->Value, NULL) == 0) {
 813       //
 814       // Find current selected Option for OneOf
 815       //
 816       HighlightOptionIndex = Index;
 817     }
 818
 819     Link = GetNextNode (&Question->OptionListHead, Link);
 820   }
 821
 822   //
 823   // Perform popup menu initialization.
 824   //
 825   PopUpWidth = PopUpWidth + POPUP_PAD_SPACE_COUNT;
 826
 827   SavedAttribute = gST->ConOut->Mode->Attribute;
 828   gST->ConOut->SetAttribute (gST->ConOut, POPUP_TEXT | POPUP_BACKGROUND);
 829
 830   if ((PopUpWidth + POPUP_FRAME_WIDTH) > DimensionsWidth) {
 831     PopUpWidth = DimensionsWidth - POPUP_FRAME_WIDTH;
 832   }
 833
 834   Start  = (DimensionsWidth - PopUpWidth - POPUP_FRAME_WIDTH) / 2 + gScreenDimensions.LeftColumn;
 835   End    = Start + PopUpWidth + POPUP_FRAME_WIDTH;
 836   Top    = gScreenDimensions.TopRow + NONE_FRONT_PAGE_HEADER_HEIGHT;
 837   Bottom = gScreenDimensions.BottomRow - STATUS_BAR_HEIGHT - FOOTER_HEIGHT - 1;
 838
 839   MenuLinesInView = Bottom - Top - 1;
 840   if (MenuLinesInView >= PopUpMenuLines) {
 841     Top     = Top + (MenuLinesInView - PopUpMenuLines) / 2;
 842     Bottom  = Top + PopUpMenuLines + 1;
 843   } else {
 844     ShowDownArrow = TRUE;
 845   }
 846
 847   if (HighlightOptionIndex > (MenuLinesInView - 1)) {
 848     TopOptionIndex = HighlightOptionIndex - MenuLinesInView + 1;
 849   } else {
 850     TopOptionIndex = 0;
 851   }
 852
 853   do {
 854     //
 855     // Clear that portion of the screen
 856     //
 857     ClearLines (Start, End, Top, Bottom, POPUP_TEXT | POPUP_BACKGROUND);
 858
 859     //
 860     // Draw "One of" pop-up menu
 861     //
 862     Character = BOXDRAW_DOWN_RIGHT;
 863     PrintCharAt (Start, Top, Character);
 864     for (Index = Start; Index + 2 < End; Index++) {
 865       if ((ShowUpArrow) && ((Index + 1) == (Start + End) / 2)) {
 866         Character = GEOMETRICSHAPE_UP_TRIANGLE;
 867       } else {
 868         Character = BOXDRAW_HORIZONTAL;
 869       }
 870
 871       PrintChar (Character);
 872     }
 873
 874     Character = BOXDRAW_DOWN_LEFT;
 875     PrintChar (Character);
 876     Character = BOXDRAW_VERTICAL;
 877     for (Index = Top + 1; Index < Bottom; Index++) {
 878       PrintCharAt (Start, Index, Character);
 879       PrintCharAt (End - 1, Index, Character);
 880     }
 881
 882     //
 883     // Move to top Option
 884     //
 885     Link = GetFirstNode (&Question->OptionListHead);
 886     for (Index = 0; Index < TopOptionIndex; Index++) {
 887       Link = GetNextNode (&Question->OptionListHead, Link);
 888     }
 889
 890     //
 891     // Display the One of options
 892     //
 893     Index2 = Top + 1;
 894     for (Index = TopOptionIndex; (Index < PopUpMenuLines) && (Index2 < Bottom); Index++) {
 895       OneOfOption = QUESTION_OPTION_FROM_LINK (Link);
 896       Link = GetNextNode (&Question->OptionListHead, Link);
 897
 898       StringPtr = GetToken (OneOfOption->Text, MenuOption->Handle);
 899       //
 900       // If the string occupies multiple lines, truncate it to fit in one line,
 901       // and append a "..." for indication.
 902       //
 903       if (StrLen (StringPtr) > (PopUpWidth - 1)) {
 904         TempStringPtr = AllocateZeroPool (sizeof (CHAR16) * (PopUpWidth - 1));
 905         ASSERT ( TempStringPtr != NULL );
 906         CopyMem (TempStringPtr, StringPtr, (sizeof (CHAR16) * (PopUpWidth - 5)));
 907         FreePool (StringPtr);
 908         StringPtr = TempStringPtr;
 909         StrCat (StringPtr, L"...");
 910       }
 911
 912       if (Index == HighlightOptionIndex) {
 913           //
 914           // Highlight the selected one
 915           //
 916           CurrentOption = OneOfOption;
 917
 918           gST->ConOut->SetAttribute (gST->ConOut, PICKLIST_HIGHLIGHT_TEXT | PICKLIST_HIGHLIGHT_BACKGROUND);
 919           PrintStringAt (Start + 2, Index2, StringPtr);
 920           gST->ConOut->SetAttribute (gST->ConOut, POPUP_TEXT | POPUP_BACKGROUND);
 921         } else {
 922           gST->ConOut->SetAttribute (gST->ConOut, POPUP_TEXT | POPUP_BACKGROUND);
 923           PrintStringAt (Start + 2, Index2, StringPtr);
 924         }
 925
 926       Index2++;
 927       FreePool (StringPtr);
 928     }
 929
 930     Character = BOXDRAW_UP_RIGHT;
 931     PrintCharAt (Start, Bottom, Character);
 932     for (Index = Start; Index + 2 < End; Index++) {
 933       if ((ShowDownArrow) && ((Index + 1) == (Start + End) / 2)) {
 934         Character = GEOMETRICSHAPE_DOWN_TRIANGLE;
 935       } else {
 936         Character = BOXDRAW_HORIZONTAL;
 937       }
 938
 939       PrintChar (Character);
 940     }
 941
 942     Character = BOXDRAW_UP_LEFT;
 943     PrintChar (Character);
 944
 945     //
 946     // Get User selection
 947     //
 948     Key.UnicodeChar = CHAR_NULL;
 949     if ((gDirection == SCAN_UP) || (gDirection == SCAN_DOWN)) {
 950       Key.ScanCode  = gDirection;
 951       gDirection    = 0;
 952       goto TheKey;
 953     }
 954
 955     Status = WaitForKeyStroke (&Key);
 956
 957 TheKey:
 958     switch (Key.UnicodeChar) {
 959     case '+':
 960       if (OrderedList) {
 961         if ((TopOptionIndex > 0) && (TopOptionIndex == HighlightOptionIndex)) {
 962           //
 963           // Highlight reaches the top of the popup window, scroll one menu item.
 964           //
 965           TopOptionIndex--;
 966           ShowDownArrow = TRUE;
 967         }
 968
 969         if (TopOptionIndex == 0) {
 970           ShowUpArrow = FALSE;
 971         }
 972
 973         if (HighlightOptionIndex > 0) {
 974           HighlightOptionIndex--;
 975
 976           ASSERT (CurrentOption != NULL);
 977           SwapListEntries (CurrentOption->Link.BackLink, &CurrentOption->Link);
 978         }
 979       }
 980       break;
 981
 982     case '-':
 983       //
 984       // If an ordered list op-code, we will allow for a popup of +/- keys
 985       // to create an ordered list of items
 986       //
 987       if (OrderedList) {
 988         if (((TopOptionIndex + MenuLinesInView) < PopUpMenuLines) &&
 989             (HighlightOptionIndex == (TopOptionIndex + MenuLinesInView - 1))) {
 990           //
 991           // Highlight reaches the bottom of the popup window, scroll one menu item.
 992           //
 993           TopOptionIndex++;
 994           ShowUpArrow = TRUE;
 995         }
 996
 997         if ((TopOptionIndex + MenuLinesInView) == PopUpMenuLines) {
 998           ShowDownArrow = FALSE;
 999         }
1000
1001         if (HighlightOptionIndex < (PopUpMenuLines - 1)) {
1002           HighlightOptionIndex++;
1003
1004           ASSERT (CurrentOption != NULL);
1005           SwapListEntries (&CurrentOption->Link, CurrentOption->Link.ForwardLink);
1006         }
1007       }
1008       break;
1009
1010     case CHAR_NULL:
1011       switch (Key.ScanCode) {
1012       case SCAN_UP:
1013       case SCAN_DOWN:
1014         if (Key.ScanCode == SCAN_UP) {
1015           if ((TopOptionIndex > 0) && (TopOptionIndex == HighlightOptionIndex)) {
1016             //
1017             // Highlight reaches the top of the popup window, scroll one menu item.
1018             //
1019             TopOptionIndex--;
1020             ShowDownArrow = TRUE;
1021           }
1022
1023           if (TopOptionIndex == 0) {
1024             ShowUpArrow = FALSE;
1025           }
1026
1027           if (HighlightOptionIndex > 0) {
1028             HighlightOptionIndex--;
1029           }
1030         } else {
1031           if (((TopOptionIndex + MenuLinesInView) < PopUpMenuLines) &&
1032               (HighlightOptionIndex == (TopOptionIndex + MenuLinesInView - 1))) {
1033             //
1034             // Highlight reaches the bottom of the popup window, scroll one menu item.
1035             //
1036             TopOptionIndex++;
1037             ShowUpArrow = TRUE;
1038           }
1039
1040           if ((TopOptionIndex + MenuLinesInView) == PopUpMenuLines) {
1041             ShowDownArrow = FALSE;
1042           }
1043
1044           if (HighlightOptionIndex < (PopUpMenuLines - 1)) {
1045             HighlightOptionIndex++;
1046           }
1047         }
1048         break;
1049
1050       case SCAN_ESC:
1051         gST->ConOut->SetAttribute (gST->ConOut, SavedAttribute);
1052
1053         //
1054         // Restore link list order for orderedlist
1055         //
1056         if (OrderedList) {
1057           HiiValue.Type = EFI_IFR_TYPE_NUM_SIZE_8;
1058           HiiValue.Value.u64 = 0;
1059           for (Index = 0; Index < Question->MaxContainers; Index++) {
1060             HiiValue.Value.u8 = ValueArray[Index];
1061             if (HiiValue.Value.u8 != 0) {
1062               break;
1063             }
1064
1065             OneOfOption = ValueToOption (Question, &HiiValue);
1066             if (OneOfOption == NULL) {
1067               return EFI_NOT_FOUND;
1068             }
1069
1070             RemoveEntryList (&OneOfOption->Link);
1071             InsertTailList (&Question->OptionListHead, &OneOfOption->Link);
1072           }
1073         }
1074
1075         FreePool (HiiValueArray);
1076         return EFI_DEVICE_ERROR;
1077
1078       default:
1079         break;
1080       }
1081
1082       break;
1083
1084     case CHAR_CARRIAGE_RETURN:
1085       //
1086       // return the current selection
1087       //
1088       if (OrderedList) {
1089         Index = 0;
1090         Link = GetFirstNode (&Question->OptionListHead);
1091         while (!IsNull (&Question->OptionListHead, Link)) {
1092           OneOfOption = QUESTION_OPTION_FROM_LINK (Link);
1093
1094           Question->BufferValue[Index] = OneOfOption->Value.Value.u8;
1095
1096           Index++;
1097           if (Index > Question->MaxContainers) {
1098             break;
1099           }
1100
1101           Link = GetNextNode (&Question->OptionListHead, Link);
1102         }
1103       } else {
1104         ASSERT (CurrentOption != NULL);
1105         CopyMem (&Question->HiiValue, &CurrentOption->Value, sizeof (EFI_HII_VALUE));
1106       }
1107
1108       gST->ConOut->SetAttribute (gST->ConOut, SavedAttribute);
1109       FreePool (HiiValueArray);
1110
1111       Status = ValidateQuestion (Selection->FormSet, Selection->Form, Question, EFI_HII_EXPRESSION_INCONSISTENT_IF);
1112       if (EFI_ERROR (Status)) {
1113         //
1114         // Input value is not valid, restore Question Value
1115         //
1116         GetQuestionValue (Selection->FormSet, Selection->Form, Question, TRUE);
1117       } else {
1118         SetQuestionValue (Selection->FormSet, Selection->Form, Question, TRUE);
1119         UpdateStatusBar (NV_UPDATE_REQUIRED, Question->QuestionFlags, TRUE);
1120       }
1121
1122       return Status;
1123
1124     default:
1125       break;
1126     }
1127   } while (TRUE);
1128
1129 }
1130
1131 /**
1132   Wait for a key to be pressed by user.
1133
1134   @param Key         The key which is pressed by user.
1135
1136   @retval EFI_SUCCESS The function always completed successfully.
1137
1138 **/
1139 EFI_STATUS
1140 WaitForKeyStroke (
1141   OUT  EFI_INPUT_KEY           *Key
1142   )
1143 {
1144   EFI_STATUS  Status;
1145
1146   do {
1147     UiWaitForSingleEvent (gST->ConIn->WaitForKey, 0, 0);
1148     Status = gST->ConIn->ReadKeyStroke (gST->ConIn, Key);
1149   } while (EFI_ERROR(Status));
1150
1151   return Status;
1152 }