source: xtideuniversalbios/trunk/Configurator/Src/Libraries/menu/menuprog.asm

; Project name  :   Menu library
; Description   :   ASM library for menu system.
;                   Contains functions for displaying progress bar dialog.

;--------------- Equates -----------------------------

; Dialog init and return variables.
; This is an expanded MSGVARS struct.
struc PDLGVARS
    .msgVars    resb    MSGVARS_size

    ; Dialog parameters
    .fpUser     resb    4   ; Far pointer to user specific data
    .ffnTask    resb    4   ; Far pointer to task function

    ; Return variables for different dialogs
    .wRetUser   resb    2   ; User specific return variable
endstruc

;--------------------------------------------------------------------
; Function prototype for Progress Task function (PDLGVARS.fnTask).
; Cursor will be set to Title string location so user may modify the
; title string if needed.
; Remember to return with RETF instead of RET!
;   Parameters:
;       DS:SI:  User specified far pointer
;   Returns:
;       AX:     User specified return code if CF set
;               Task completion percentage (0...100) if CF cleared
;       CF:     Set if task was completed or cancelled
;               Cleared if task must be continued
;   Corrupts registers:
;       BX, CX, DX
;--------------------------------------------------------------------


;-------------- Private global variables -------------
; Section containing initialized data
;SECTION .data


;-------------- Public functions ---------------------
; Section containing code
SECTION .text


;--------------------------------------------------------------------
; Displays progress bar dialog.
;
; MenuProg_Show
;   Parameters:
;       BL:     Dialog width with borders included
;       BH:     Dialog height with borders included
;       SS:BP:  Ptr to MENUVARS
;       ES:DI:  Far ptr to user specified task function
;       DS:SI:  User specified far pointer
;   Returns:
;       AX:     User specified return code
;   Corrupts registers:
;       BX, CX, DX
;--------------------------------------------------------------------
ALIGN JUMP_ALIGN
MenuProg_Show:
    ; Create stack frame
    eENTER  PDLGVARS_size, 0
    sub     bp, PDLGVARS_size               ; Point to PDLGVARS

    ; Initialize menu variables
    mov     [bp+MENUVARS.wSize], bx         ; Menu size
    mov     [bp+PDLGVARS.fpUser], si        ; Store user defined...
    mov     [bp+PDLGVARS.fpUser+2], ds      ; ...far pointer
    mov     [bp+PDLGVARS.ffnTask], di       ; Store far ptr to...
    mov     [bp+PDLGVARS.ffnTask+2], es     ; ...task function
    mov     WORD [bp+MENUVARS.wTopDwnH], 0101h  ; 1 title line, 1 info line
    mov     WORD [bp+MENUVARS.fnEvent], MenuProg_Event

    ; Enter menu
    call    MenuCrsr_GetCenter              ; Get X and Y coordinates to DX
    xor     cx, cx                          ; No menuitems
    xor     bx, bx                          ; Menu flags
    xor     ax, ax                          ; Selection timeout (disable)
    call    Menu_Init                       ; Returns only after dlg closed

    ; Return
    mov     ax, [bp+PDLGVARS.wRetUser]      ; Load user return variable
    add     bp, PDLGVARS_size               ; Point to old BP
    eLEAVE                                  ; Destroy stack frame
    ret


;-------------- Private functions ---------------------

;--------------------------------------------------------------------
; Draws progress bar.
;
; MenuProg_DrawBar
;   Parameters:
;       AX:     Completion percentage (0...100)
;       SS:BP:  Ptr to PDLGVARS
;   Returns:
;       Nothing
;   Corrupts registers:
;       AX, BX, CX, DX
;--------------------------------------------------------------------
ALIGN JUMP_ALIGN
MenuProg_DrawBar:
    ; Calculate number of chars to draw
    eMOVZX  cx, [bp+MENUVARS.bWidth]        ; Dialog width to CX
    sub     cl, 4                           ; Sub borders, CX=bar width
    mul     cl                              ; AX=bar with * percentage
    mov     bx, 100                         ; Prepare to div by 100
    div     bl                              ; AL=Full char cnt
    sub     cl, al                          ; CX=Empty char cnt
    mov     bl, al                          ; BX=full char cnt

    ; Draw full chars
    mov     dl, FULL_BLCK                   ; Load full block char
    xchg    bx, cx                          ; CX=full chars, BX=empty chars
    call    Print_Repeat                    ; Repeat chars
    mov     dl, MIN_BLCK                    ; Load min block char
    mov     cx, bx                          ; CX=empty chars
    call    Print_Repeat                    ; Repeat chars
    ret


;--------------------------------------------------------------------
; File dialog event handler.
;
; MenuProg_Event
;   Parameters:
;       BX:     Callback event
;       CX:     Selected menuitem index
;       DX:     Event parameter (event specific)
;       SS:BP:  Ptr to PDLGVARS
;   Returns:
;       AH:     Event specific or unused
;       AL:     1=Event processed
;               0=Event not processed (default action if any)
;   Corrupts registers:
;       BX, CX, DX
;--------------------------------------------------------------------
ALIGN JUMP_ALIGN
MenuProg_Event:
    cmp     bx, EVNT_MNU_UPD        ; Update menu string?
    je      .EventUpd               ;  If so, jump to update
    xor     ax, ax                  ; Event not processed
    ret

ALIGN JUMP_ALIGN
.EventHandled:  ; Return point from all handled events
    mov     ax, 1
    ret

;--------------------------------------------------------------------
; EVNT_MNU_UPD event handler.
;
; .EventUpd
;   Parameters:
;       CX:     Index of menuitem to update (MFL_UPD_ITEM only)
;       DL:     Update flag:
;                   MFL_UPD_TITLE   Set to update title string
;                   MFL_UPD_NFO     Set to update info string
;                   MFL_UPD_ITEM    Set to update menuitem string
;       SS:BP:  Ptr to PDLGVARS
;   Returns:
;       AX:     1 (Event processed)
;   Corrupts registers:
;       BX, CX, DX
;--------------------------------------------------------------------
ALIGN JUMP_ALIGN
.EventUpd:
    test    dl, MFL_UPD_NFO     ; Update info?
    jz      .EventHandled       ;  If not, do nothing and return

    ; Start task
    push    ds
    push    si
    lds     si, [bp+PDLGVARS.fpUser]    ; Load user defined ptr
    xor     ax, ax                      ; Zero percent
ALIGN JUMP_ALIGN
.TaskLoop:
    push    ax
    call    MenuCrsr_PointInfo          ; Point cursor to info string
    pop     ax
    call    MenuProg_DrawBar            ; Draw progress bar
    call    MenuCrsr_PointTitle         ; Point cursor to title string
    call    far [bp+PDLGVARS.ffnTask]   ; Call task function
    jnc     .TaskLoop                   ; Loop until task complete

    ; Task complete
    mov     [bp+PDLGVARS.wRetUser], ax  ; Store user return value
    pop     si
    pop     ds
    jmp     MenuDlg_ExitHandler         ; Close progress bar