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/** @file
This module provide help function for displaying unicode string.
Copyright (c) 2006 - 2009, Intel Corporation<BR>
All rights reserved. This program and the accompanying materials
are licensed and made available under the terms and conditions of the BSD License
which 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 <EdkIICommon.h>
#include <AmiDxeLib.h>
#include <Protocol/SimpleTextIn.h>
#define EFI_SIMPLE_TEXT_OUT_PROTOCOL EFI_SIMPLE_TEXT_OUTPUT_PROTOCOL
#define EFI_SIMPLE_TEXT_OUTPUT_MODE SIMPLE_TEXT_OUTPUT_MODE
/**
Draws a dialog box to the console output device specified by
ConOut defined in the EFI_SYSTEM_TABLE and waits for a keystroke
from the console input device specified by ConIn defined in the
EFI_SYSTEM_TABLE.
If there are no strings in the variable argument list, then ASSERT().
If all the strings in the variable argument list are empty, then ASSERT().
@param[in] Attribute Specifies the foreground and background color of the popup.
@param[out] Key A pointer to the EFI_KEY value of the key that was
pressed. This is an optional parameter that may be NULL.
If it is NULL then no wait for a keypress will be performed.
@param[in] ... The variable argument list that contains pointers to Null-
terminated Unicode strings to display in the dialog box.
The variable argument list is terminated by a NULL.
**/
VOID
EFIAPI
CreatePopUp (
IN UINTN Attribute,
OUT EFI_INPUT_KEY *Key, OPTIONAL
...
)
{
VA_LIST Args;
EFI_SIMPLE_TEXT_OUTPUT_PROTOCOL *ConOut;
EFI_SIMPLE_TEXT_OUTPUT_MODE SavedConsoleMode;
UINTN Columns;
UINTN Rows;
UINTN Column;
UINTN Row;
UINTN NumberOfLines;
UINTN MaxLength;
CHAR16 *String;
UINTN Length;
CHAR16 *Line;
UINTN EventIndex;
//
// Determine the length of the longest line in the popup and the the total
// number of lines in the popup
//
VA_START (Args, Key);
MaxLength = 0;
NumberOfLines = 0;
while ((String = VA_ARG (Args, CHAR16 *)) != NULL) {
MaxLength = MAX (MaxLength, StrLen (String));
NumberOfLines++;
}
VA_END (Args);
//
// If the total number of lines in the popup is zero, then ASSERT()
//
ASSERT (NumberOfLines != 0);
//
// If the maximum length of all the strings is zero, then ASSERT()
//
ASSERT (MaxLength != 0);
//
// Cache a pointer to the Simple Text Output Protocol in the EFI System Table
//
ConOut = gST->ConOut;
//
// Save the current console cursor position and attributes
//
CopyMem (&SavedConsoleMode, ConOut->Mode, sizeof (SavedConsoleMode));
//
// Retrieve the number of columns and rows in the current console mode
//
ConOut->QueryMode (ConOut, SavedConsoleMode.Mode, &Columns, &Rows);
//
// Disable cursor and set the foreground and background colors specified by Attribute
//
ConOut->EnableCursor (ConOut, FALSE);
ConOut->SetAttribute (ConOut, Attribute);
//
// Limit NumberOfLines to height of the screen minus 3 rows for the box itself
//
NumberOfLines = MIN (NumberOfLines, Rows - 3);
//
// Limit MaxLength to width of the screen minus 2 columns for the box itself
//
MaxLength = MIN (MaxLength, Columns - 2);
//
// Compute the starting row and starting column for the popup
//
Row = (Rows - (NumberOfLines + 3)) / 2;
Column = (Columns - (MaxLength + 2)) / 2;
//
// Allocate a buffer for a single line of the popup with borders and a Null-terminator
//
Line = AllocateZeroPool ((MaxLength + 3) * sizeof (CHAR16));
ASSERT (Line != NULL);
//
// Draw top of popup box
//
SetMem16 (Line, (MaxLength + 2) * 2, BOXDRAW_HORIZONTAL);
Line[0] = BOXDRAW_DOWN_RIGHT;
Line[MaxLength + 1] = BOXDRAW_DOWN_LEFT;
Line[MaxLength + 2] = L'\0';
ConOut->SetCursorPosition (ConOut, Column, Row++);
ConOut->OutputString (ConOut, Line);
//
// Draw middle of the popup with strings
//
VA_START (Args, Key);
while ((String = VA_ARG (Args, CHAR16 *)) != NULL && NumberOfLines > 0) {
Length = StrLen (String);
SetMem16 (Line, (MaxLength + 2) * 2, L' ');
if (Length <= MaxLength) {
//
// Length <= MaxLength
//
CopyMem (Line + 1 + (MaxLength - Length) / 2, String , Length * sizeof (CHAR16));
} else {
//
// Length > MaxLength
//
CopyMem (Line + 1, String + (Length - MaxLength) / 2 , MaxLength * sizeof (CHAR16));
}
Line[0] = BOXDRAW_VERTICAL;
Line[MaxLength + 1] = BOXDRAW_VERTICAL;
Line[MaxLength + 2] = L'\0';
ConOut->SetCursorPosition (ConOut, Column, Row++);
ConOut->OutputString (ConOut, Line);
NumberOfLines--;
}
VA_END (Args);
//
// Draw bottom of popup box
//
SetMem16 (Line, (MaxLength + 2) * 2, BOXDRAW_HORIZONTAL);
Line[0] = BOXDRAW_UP_RIGHT;
Line[MaxLength + 1] = BOXDRAW_UP_LEFT;
Line[MaxLength + 2] = L'\0';
ConOut->SetCursorPosition (ConOut, Column, Row++);
ConOut->OutputString (ConOut, Line);
//
// Free the allocated line buffer
//
FreePool (Line);
//
// Restore the cursor visibility, position, and attributes
//
ConOut->EnableCursor (ConOut, SavedConsoleMode.CursorVisible);
ConOut->SetCursorPosition (ConOut, SavedConsoleMode.CursorColumn, SavedConsoleMode.CursorRow);
ConOut->SetAttribute (ConOut, SavedConsoleMode.Attribute);
//
// Wait for a keystroke
//
if (Key != NULL) {
gBS->WaitForEvent (1, &gST->ConIn->WaitForKey, &EventIndex);
gST->ConIn->ReadKeyStroke (gST->ConIn, Key);
}
}
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