| 1 | ; File name : menuloop.asm
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| 2 | ; Project name : Menu library
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| 3 | ; Created date : 11.11.2009
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| 4 | ; Last update : 10.12.2009
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| 5 | ; Author : Tomi Tilli
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| 6 | ; Description : ASM library to menu system.
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| 7 | ; Contains event dispatching loop.
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| 8 |
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| 9 | ;--------------- Equates -----------------------------
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| 10 |
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| 11 | ; BIOS scan codes
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| 12 | KEY_ENTER EQU 1Ch
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| 13 | KEY_ESC EQU 01h
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| 14 | KEY_UP EQU 48h
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| 15 | KEY_DOWN EQU 50h
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| 16 | KEY_PGUP EQU 49h
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| 17 | KEY_PGDN EQU 51h
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| 18 | KEY_HOME EQU 47h
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| 19 | KEY_END EQU 4Fh
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| 20 | CNT_MENU_KEYS EQU 8 ; Number of menukeys
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| 21 |
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| 22 |
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| 23 | ;-------------- Private global variables -------------
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| 24 | ; Section containing initialized data
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| 25 | ;SECTION .data
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| 26 |
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| 27 |
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| 28 | ;-------------- Public functions ---------------------
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| 29 | ; Section containing code
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| 30 | SECTION .text
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| 31 |
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| 32 |
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| 33 | ;--------------------------------------------------------------------
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| 34 | ; Waits keyboard input, updates timeout and dispatch event for
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| 35 | ; user handler.
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| 36 | ; Parameters:
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| 37 | ; SS:BP: Ptr to MENUVARS
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| 38 | ; Returns:
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| 39 | ; Nothing
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| 40 | ; Corrupts registers:
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| 41 | ; AX, BX, CX, DX
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| 42 | ;--------------------------------------------------------------------
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| 43 | ALIGN JUMP_ALIGN
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| 44 | MenuLoop_Enter:
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| 45 | ; Get current time for timeout
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| 46 | call Menu_GetTime ; Get system time ticks to CX:DX
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| 47 | mov [bp+MENUVARS.wTimeLast], dx ; Store last read time
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| 48 |
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| 49 | ; Check if menu operation should be continued
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| 50 | ALIGN JUMP_ALIGN
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| 51 | .CheckExit:
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| 52 | test BYTE [bp+MENUVARS.bFlags], FLG_MNU_EXIT
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| 53 | jnz .Return ; Return if exit flag set
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| 54 |
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| 55 | ; Check if keystroke available
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| 56 | call Keys_GetStroke ; Get keystroke to AX
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| 57 | jz .CheckTimeout ; If no keystroke, jump to check timeout
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| 58 | call MenuLoop_ProcessKey ; Convert keystroke to events
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| 59 |
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| 60 | ; Check if timeout needs updating
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| 61 | ALIGN JUMP_ALIGN
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| 62 | .CheckTimeout:
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| 63 | cmp WORD [bp+MENUVARS.wTimeInit], 0 ; Timeout enabled?
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| 64 | jz .CheckExit ; If not, loop
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| 65 | call Menu_GetTime ; Get system time ticks to CX:DX
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| 66 | mov cx, dx ; Copy time loword to CX
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| 67 | sub dx, [bp+MENUVARS.wTimeLast] ; Has time changed?
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| 68 | je .CheckExit ; If not, loop
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| 69 |
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| 70 | ; Update timeout
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| 71 | mov [bp+MENUVARS.wTimeLast], cx ; Store last update time
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| 72 | sub [bp+MENUVARS.wTimeout], dx ; Update timeout
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| 73 | ja .PrintTimeout ; If time left, just print new value
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| 74 | call MenuLoop_SendSelEvent ; Send selection event
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| 75 |
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| 76 | ; Print timeout value
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| 77 | ALIGN JUMP_ALIGN
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| 78 | .PrintTimeout:
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| 79 | call MenuDraw_Timeout
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| 80 | xor dx, dx
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| 81 | call MenuCrsr_PointBelowBrdr
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| 82 | jmp .CheckExit
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| 83 |
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| 84 | ALIGN JUMP_ALIGN
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| 85 | .Return:
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| 86 | ret
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| 87 |
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| 88 |
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| 89 | ;--------------------------------------------------------------------
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| 90 | ; Sends Menu event to user handler (MENUVARS.fnEvent).
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| 91 | ; MenuLoop_SendSelEvent Sends Menuitem Selected event to user event handler
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| 92 | ; MenuLoop_SendEvent Sends any event to user event handler
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| 93 | ; Parameters:
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| 94 | ; BX: Event code (MenuLoop_SendEvent only)
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| 95 | ; DX: Event parameter (event specific)
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| 96 | ; SS:BP: Ptr to MENUVARS
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| 97 | ; Returns:
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| 98 | ; AH: Event specific or unused
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| 99 | ; AL: 1=Event processed
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| 100 | ; 0=Event not processed (default action if any)
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| 101 | ; Corrupts registers:
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| 102 | ; BX, CX, DX
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| 103 | ;--------------------------------------------------------------------
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| 104 | ALIGN JUMP_ALIGN
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| 105 | MenuLoop_SendSelEvent:
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| 106 | mov bx, EVNT_MNU_SELSET
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| 107 | ALIGN JUMP_ALIGN
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| 108 | MenuLoop_SendEvent:
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| 109 | mov cx, [bp+MENUVARS.wItemSel]
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| 110 | call [bp+MENUVARS.fnEvent]
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| 111 | ret
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| 112 |
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| 113 |
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| 114 | ;-------------- Private functions ---------------------
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| 115 |
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| 116 |
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| 117 | ;--------------------------------------------------------------------
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| 118 | ; Processed menu key input.
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| 119 | ; Menu keys will be handled and other keys dispatched as key events.
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| 120 | ; Parameters:
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| 121 | ; AH: BIOS Scan Code for key
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| 122 | ; AL: ASCII character
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| 123 | ; SS:BP: Ptr to MENUVARS
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| 124 | ; Returns:
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| 125 | ; Nothing
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| 126 | ; Corrupts registers:
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| 127 | ; AX, BX, CX, DX
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| 128 | ;--------------------------------------------------------------------
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| 129 | ALIGN JUMP_ALIGN
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| 130 | MenuLoop_ProcessKey:
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| 131 | push es
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| 132 | push di
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| 133 |
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| 134 | ; Check if wanted key
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| 135 | push cs
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| 136 | pop es ; Copy CS to ES
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| 137 | mov cx, CNT_MENU_KEYS ; Load number of menu keys
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| 138 | mov di, .rgbKeyToIdx ; Load offset to translation table
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| 139 | xchg al, ah ; Scan code to AL
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| 140 | cld ; SCASB to increment DI
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| 141 | repne scasb ; Compare [ES:DI] to AL until match
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| 142 | jne .Dispatch ; If not menukey, jump to dispatch
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| 143 |
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| 144 | ; Jump to process menu key
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| 145 | mov di, CNT_MENU_KEYS-1 ; Convert CX...
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| 146 | sub di, cx ; ...to lookup index
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| 147 | shl di, 1 ; Prepare for word lookup
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| 148 | jmp [cs:di+.rgwMenuKeyJmp]
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| 149 |
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| 150 | ; Dispatch key event
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| 151 | ALIGN JUMP_ALIGN
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| 152 | .Dispatch:
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| 153 | xchg al, ah ; Restore AX
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| 154 | mov bx, EVNT_MNU_KEY
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| 155 | mov dx, ax ; Copy keys to DX
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| 156 | call MenuLoop_SendEvent
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| 157 | ALIGN JUMP_ALIGN
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| 158 | .Return:
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| 159 | pop di
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| 160 | pop es
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| 161 | ret
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| 162 |
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| 163 | ;;;;;;;;;;;;;;;;;;;;;
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| 164 | ; Menu key handlers ;
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| 165 | ;;;;;;;;;;;;;;;;;;;;;
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| 166 |
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| 167 | ; ENTER pressed
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| 168 | ALIGN JUMP_ALIGN
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| 169 | .KeyEnter:
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| 170 | call MenuLoop_SendSelEvent ; Send selection event
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| 171 | jmp .Return
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| 172 |
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| 173 | ; ESC pressed
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| 174 | ALIGN JUMP_ALIGN
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| 175 | .KeyEsc:
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| 176 | call Menu_Exit
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| 177 | jc .Return ; User cancelled exit
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| 178 | mov WORD [bp+MENUVARS.wItemSel], -1
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| 179 | jmp .Return
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| 180 |
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| 181 | ; UP pressed
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| 182 | ALIGN JUMP_ALIGN
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| 183 | .KeyUp:
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| 184 | %ifdef USE_MENU_DIALOGS
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| 185 | test BYTE [bp+MENUVARS.bFlags], FLG_MNU_NOARRW ; Message dialog mode?
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| 186 | jnz .TextScrollUp ; If so, go to text scrolling
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| 187 | %endif
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| 188 | mov ax, [bp+MENUVARS.wItemSel] ; Load selected index
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| 189 | test ax, ax ; Already at top?
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| 190 | jz .KeyEnd ; If so, go to end
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| 191 | mov dx, ax ; Copy selected index to DX
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| 192 | dec ax ; Decrement menuitem index
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| 193 | mov [bp+MENUVARS.wItemSel], ax ; Store new index
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| 194 | cmp ax, [bp+MENUVARS.wItemTop] ; Need to scroll?
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| 195 | jae .DrawSelection ; If not, go to draw selection
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| 196 | dec WORD [bp+MENUVARS.wItemTop] ; Scroll
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| 197 | jmp .ScrollMenu
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| 198 |
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| 199 | %ifdef USE_MENU_DIALOGS
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| 200 | ALIGN JUMP_ALIGN
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| 201 | .TextScrollUp:
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| 202 | cmp WORD [bp+MENUVARS.wItemTop], 0 ; Already at the top?
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| 203 | jz .Return ; If so, return
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| 204 | dec WORD [bp+MENUVARS.wItemTop]
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| 205 | jmp .ScrollMenu
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| 206 | %endif
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| 207 |
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| 208 | ; DOWN pressed
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| 209 | ALIGN JUMP_ALIGN
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| 210 | .KeyDown:
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| 211 | %ifdef USE_MENU_DIALOGS
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| 212 | test BYTE [bp+MENUVARS.bFlags], FLG_MNU_NOARRW ; Message dialog mode?
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| 213 | jnz .TextScrollDown ; If so, go to text scrolling
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| 214 | %endif
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| 215 | mov ax, [bp+MENUVARS.wItemSel] ; Load selected index
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| 216 | mov dx, ax ; Copy selected index to DX
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| 217 | inc ax ; Increment menuitem index
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| 218 | cmp ax, [bp+MENUVARS.wItemCnt] ; Already at bottom?
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| 219 | je .KeyHome ; If so, go to beginning
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| 220 | mov [bp+MENUVARS.wItemSel], ax ; Store new menuitem index
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| 221 | eMOVZX bx, BYTE [bp+MENUVARS.bVisCnt] ; Load number of visible items
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| 222 | add bx, [bp+MENUVARS.wItemTop] ; BX to one past last visible index
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| 223 | cmp ax, bx ; Need to scroll?
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| 224 | jb .DrawSelection ; If not, go to draw selection
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| 225 | inc WORD [bp+MENUVARS.wItemTop] ; Scroll
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| 226 | jmp .ScrollMenu
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| 227 |
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| 228 | %ifdef USE_MENU_DIALOGS
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| 229 | ALIGN JUMP_ALIGN
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| 230 | .TextScrollDown:
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| 231 | eMOVZX ax, BYTE [bp+MENUVARS.bVisCnt] ; Load visible items
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| 232 | add ax, [bp+MENUVARS.wItemTop] ; Add topmost menuitem index
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| 233 | cmp ax, [bp+MENUVARS.wItemCnt] ; Already at the bottom?
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| 234 | jae .Return ; If so, return
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| 235 | inc WORD [bp+MENUVARS.wItemTop]
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| 236 | jmp .ScrollMenu
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| 237 | %endif
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| 238 |
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| 239 | ; PGUP pressed
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| 240 | ALIGN JUMP_ALIGN
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| 241 | .KeyPgUp:
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| 242 | mov ax, [bp+MENUVARS.wItemSel] ; Load selected index
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| 243 | div BYTE [bp+MENUVARS.bVisCnt] ; AL=Current page index
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| 244 | sub al, 1 ; Decrement page
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| 245 | jc .KeyHome ; Select first item if overflow
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| 246 | mul BYTE [bp+MENUVARS.bVisCnt] ; AX=Fist menuitem on page
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| 247 | mov [bp+MENUVARS.wItemSel], ax
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| 248 | mov [bp+MENUVARS.wItemTop], ax
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| 249 | jmp .ScrollMenu
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| 250 |
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| 251 | ; PGDN pressed
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| 252 | ALIGN JUMP_ALIGN
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| 253 | .KeyPgDn:
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| 254 | mov ax, [bp+MENUVARS.wItemSel] ; Load selected index
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| 255 | div BYTE [bp+MENUVARS.bVisCnt] ; AL=Current page index
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| 256 | inc ax ; Increment page
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| 257 | mul BYTE [bp+MENUVARS.bVisCnt] ; AX=First menuitem on page
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| 258 | eMOVZX bx, BYTE [bp+MENUVARS.bVisCnt] ; Load number of visible items
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| 259 | add bx, ax ; BX now one past last visible
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| 260 | cmp bx, [bp+MENUVARS.wItemCnt] ; Went over last?
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| 261 | jae .KeyEnd ; If so, select last menuitem
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| 262 | mov [bp+MENUVARS.wItemSel], ax
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| 263 | mov [bp+MENUVARS.wItemTop], ax
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| 264 | jmp .ScrollMenu
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| 265 |
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| 266 | ; HOME pressed
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| 267 | ALIGN JUMP_ALIGN
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| 268 | .KeyHome:
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| 269 | xor ax, ax
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| 270 | mov [bp+MENUVARS.wItemSel], ax
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| 271 | mov [bp+MENUVARS.wItemTop], ax
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| 272 | jmp .ScrollMenu
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| 273 |
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| 274 | ; END pressed
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| 275 | ALIGN JUMP_ALIGN
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| 276 | .KeyEnd:
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| 277 | mov ax, [bp+MENUVARS.wItemCnt] ; Load number if menuitems
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| 278 | mov bx, ax ; Copy menuitem count to BX
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| 279 | dec ax ; Decrement for last index
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| 280 | mov [bp+MENUVARS.wItemSel], ax ; Store new selection
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| 281 | sub bl, [bp+MENUVARS.bVisCnt] ; BX to first menuitem to draw
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| 282 | sbb bh, 0
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| 283 | mov [bp+MENUVARS.wItemTop], bx ; Store first menuitem to draw
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| 284 | jnc .ScrollMenu
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| 285 | mov WORD [bp+MENUVARS.wItemTop], 0 ; Overflow, start with 0
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| 286 | ; Fall to .ScrollMenu
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| 287 |
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| 288 | ; Menuitem selection changed, redraw all items
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| 289 | ALIGN JUMP_ALIGN
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| 290 | .ScrollMenu:
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| 291 | mov bx, EVNT_MMU_SELCHG
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| 292 | call MenuLoop_SendEvent
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| 293 | call Menu_RestartTimeout
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| 294 | xor cx, cx ; Invalidate...
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| 295 | dec cx ; ...all menuitems
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| 296 | mov dl, MFL_UPD_ITEM
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| 297 | call Menu_Invalidate
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| 298 | jmp .Return
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| 299 |
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| 300 | ; Menuitem selection changed, only two items needs to be redrawn
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| 301 | ALIGN JUMP_ALIGN
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| 302 | .DrawSelection:
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| 303 | MINMAX_U ax, dx ; First menuitem to AX, next to DX
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| 304 | push dx ; Store second to draw
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| 305 | push ax ; Store first to draw
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| 306 | mov bx, EVNT_MMU_SELCHG
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| 307 | call MenuLoop_SendEvent
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| 308 | call Menu_RestartTimeout
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| 309 | pop cx ; First to draw to CX
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| 310 | call MenuCrsr_PointNthItem ; Set cursor position
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| 311 | call MenuDraw_Item ; Draw first menuitem
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| 312 | pop cx ; Second to draw to CX
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| 313 | call MenuDraw_Item ; Draw second menuitem
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| 314 | jmp .Return
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| 315 |
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| 316 | ALIGN WORD_ALIGN
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| 317 | .rgwMenuKeyJmp:
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| 318 | dw .KeyEnter ; KEY_ENTER
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| 319 | dw .KeyEsc ; KEY_ESC
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| 320 | dw .KeyUp ; KEY_UP
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| 321 | dw .KeyDown ; KEY_DOWN
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| 322 | dw .KeyPgUp ; KEY_PGUP
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| 323 | dw .KeyPgDn ; KEY_PGDN
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| 324 | dw .KeyHome ; KEY_HOME
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| 325 | dw .KeyEnd ; KEY_END
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| 326 | ; Scan code to jump index translation table
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| 327 | .rgbKeyToIdx:
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| 328 | db KEY_ENTER, KEY_ESC, KEY_UP, KEY_DOWN,
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| 329 | db KEY_PGUP, KEY_PGDN, KEY_HOME, KEY_END
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