source: xtideuniversalbios/trunk/Assembly_Library/Src/Menu/Dialog/DialogDrive.asm @ 526

; Project name  :   Assembly Library
; Description   :   Displays drive dialog.

;
; XTIDE Universal BIOS and Associated Tools
; Copyright (C) 2009-2010 by Tomi Tilli, 2011-2013 by XTIDE Universal BIOS Team.
;
; This program is free software; you can redistribute it and/or modify
; it under the terms of the GNU General Public License as published by
; the Free Software Foundation; either version 2 of the License, or
; (at your option) any later version.
;
; This program is distributed in the hope that it will be useful,
; but WITHOUT ANY WARRANTY; without even the implied warranty of
; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
; GNU General Public License for more details.
; Visit http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
;

; Section containing code
SECTION .text

;--------------------------------------------------------------------
; DialogDrive_GetDriveWithIoInDSSI
;   Parameters:
;       DS:SI:  Ptr to DRIVE_DIALOG_IO
;       SS:BP:  Ptr to parent MENU
;   Returns:
;       Nothing
;   Corrupts registers:
;       AX, BX, CX, DX, SI, DI
;--------------------------------------------------------------------
ALIGN JUMP_ALIGN
DialogDrive_GetDriveWithIoInDSSI:
    mov     bx, DriveEventHandler
    mov     BYTE [si+DRIVE_DIALOG_IO.bUserCancellation], TRUE
    jmp     Dialog_DisplayWithDialogInputInDSSIandHandlerInBX


;--------------------------------------------------------------------
; DriveEventHandler
;   Common parameters for all events:
;       BX:         Menu event (anything from MENUEVENT struct)
;       SS:BP:      Ptr to DIALOG
;   Common return values for all events:
;       CF:         Set if event processed
;                   Cleared if event not processed
;   Corrupts registers:
;       All
;--------------------------------------------------------------------
ALIGN JUMP_ALIGN
DriveEventHandler:
    jmp     [cs:bx+.rgfnEventHandlers]


ALIGN JUMP_ALIGN
.InitializeMenuinitFromDSSI:
    xor     ax, ax
    call    Dialog_EventInitializeMenuinitFromDSSIforSingleItemWithHighlightedItemInAX
    call    Drive_GetFlagsForAvailableDrivesToDXAX
    mov     [bp+MENU.dwUserData], ax
    mov     [bp+MENU.dwUserData+2], dx

    call    Bit_GetSetCountToCXfromDXAX
    mov     [bp+MENUINIT.wItems], cx

    dec     cx          ; Items initialized to one. Ignore it.
    add     cl, [bp+MENUINIT.bHeight]
    CALL_DISPLAY_LIBRARY GetColumnsToALandRowsToAH
    MIN_U   cl, ah
    mov     [bp+MENUINIT.bHeight], cl
    ret


ALIGN JUMP_ALIGN
.ItemSelectedFromCX:
    call    ConvertDriveLetterToBLfromItemIndexInCX
    lds     si, [bp+DIALOG.fpDialogIO]
    mov     BYTE [si+DRIVE_DIALOG_IO.bUserCancellation], FALSE
    mov     [si+DRIVE_DIALOG_IO.cReturnDriveLetter], bl
    sub     bl, 'A'
    mov     [si+DRIVE_DIALOG_IO.bReturnDriveNumber], bl
    jmp     MenuInit_CloseMenuWindow


ALIGN JUMP_ALIGN
.RefreshItemFromCX:
    push    bp

    call    ConvertDriveLetterToBLfromItemIndexInCX
    mov     bp, sp
    push    bx
    mov     si, g_szDriveFormat
    CALL_DISPLAY_LIBRARY FormatNullTerminatedStringFromCSSI

    pop     bp
    stc
    ret


.rgfnEventHandlers:
istruc MENUEVENT
    at  MENUEVENT.InitializeMenuinitFromDSSI,   dw  .InitializeMenuinitFromDSSI
    at  MENUEVENT.ExitMenu,                     dw  Dialog_EventExitMenu
    at  MENUEVENT.IdleProcessing,               dw  Dialog_EventNotHandled
    at  MENUEVENT.ItemHighlightedFromCX,        dw  Dialog_EventNotHandled
    at  MENUEVENT.ItemSelectedFromCX,           dw  .ItemSelectedFromCX
    at  MENUEVENT.KeyStrokeInAX,                dw  Dialog_EventNotHandled
    at  MENUEVENT.RefreshTitle,                 dw  Dialog_EventRefreshTitle
    at  MENUEVENT.RefreshInformation,           dw  Dialog_EventRefreshInformation
    at  MENUEVENT.RefreshItemFromCX,            dw  .RefreshItemFromCX
iend


;--------------------------------------------------------------------
; ConvertDriveLetterToBLfromItemIndexInCX
;   Parameters:
;       CX:     Item index
;       SS:BP:  Ptr to DIALOG
;   Returns:
;       BL:     Drive letter
;   Corrupts registers:
;       AX, CX, DX
;--------------------------------------------------------------------
ALIGN JUMP_ALIGN
ConvertDriveLetterToBLfromItemIndexInCX:
    inc     cx          ; Index to count
    mov     bl, 'A'-1
    mov     ax, [bp+MENU.dwUserData]
    mov     dx, [bp+MENU.dwUserData+2]
ALIGN JUMP_ALIGN
.CheckNextBit:
    inc     bx          ; Increment drive letter
    shr     dx, 1
    rcr     ax, 1
    jnc     SHORT .CheckNextBit
    loop    .CheckNextBit
    ret