Move more code from home.asm to home/

home/list_menu.asm

@@ -0,0 +1,526 @@
+; INPUT:
+; [wListMenuID] = list menu ID
+; [wListPointer] = address of the list (2 bytes)
+DisplayListMenuID::
+	xor a
+	ld [hAutoBGTransferEnabled], a ; disable auto-transfer
+	ld a, 1
+	ld [hJoy7], a ; joypad state update flag
+	ld a, [wBattleType]
+	and a ; is it the Old Man battle?
+	jr nz, .specialBattleType
+	ld a, $01 ; hardcoded bank
+	jr .bankswitch
+.specialBattleType ; Old Man battle
+	ld a, BANK(DisplayBattleMenu)
+.bankswitch
+	call BankswitchHome
+	ld hl, wd730
+	set 6, [hl] ; turn off letter printing delay
+	xor a
+	ld [wMenuItemToSwap], a ; 0 means no item is currently being swapped
+	ld [wListCount], a
+	ld a, [wListPointer]
+	ld l, a
+	ld a, [wListPointer + 1]
+	ld h, a ; hl = address of the list
+	ld a, [hl] ; the first byte is the number of entries in the list
+	ld [wListCount], a
+	ld a, LIST_MENU_BOX
+	ld [wTextBoxID], a
+	call DisplayTextBoxID ; draw the menu text box
+	call UpdateSprites ; disable sprites behind the text box
+; the code up to .skipMovingSprites appears to be useless
+	coord hl, 4, 2 ; coordinates of upper left corner of menu text box
+	lb de, 9, 14 ; height and width of menu text box
+	ld a, [wListMenuID]
+	and a ; is it a PC pokemon list?
+	jr nz, .skipMovingSprites
+	call UpdateSprites
+.skipMovingSprites
+	ld a, 1 ; max menu item ID is 1 if the list has less than 2 entries
+	ld [wMenuWatchMovingOutOfBounds], a
+	ld a, [wListCount]
+	cp 2 ; does the list have less than 2 entries?
+	jr c, .setMenuVariables
+	ld a, 2 ; max menu item ID is 2 if the list has at least 2 entries
+.setMenuVariables
+	ld [wMaxMenuItem], a
+	ld a, 4
+	ld [wTopMenuItemY], a
+	ld a, 5
+	ld [wTopMenuItemX], a
+	ld a, A_BUTTON | B_BUTTON | SELECT
+	ld [wMenuWatchedKeys], a
+	ld c, 10
+	call DelayFrames
+
+DisplayListMenuIDLoop::
+	xor a
+	ld [hAutoBGTransferEnabled], a ; disable transfer
+	call PrintListMenuEntries
+	ld a, 1
+	ld [hAutoBGTransferEnabled], a ; enable transfer
+	call Delay3
+	ld a, [wBattleType]
+	and a ; is it the Old Man battle?
+	jr z, .notOldManBattle
+.oldManBattle
+	ld a, "▶"
+	Coorda 5, 4 ; place menu cursor in front of first menu entry
+	ld c, 80
+	call DelayFrames
+	xor a
+	ld [wCurrentMenuItem], a
+	coord hl, 5, 4
+	ld a, l
+	ld [wMenuCursorLocation], a
+	ld a, h
+	ld [wMenuCursorLocation + 1], a
+	jr .buttonAPressed
+.notOldManBattle
+	call LoadGBPal
+	call HandleMenuInput
+	push af
+	call PlaceMenuCursor
+	pop af
+	bit 0, a ; was the A button pressed?
+	jp z, .checkOtherKeys
+.buttonAPressed
+	ld a, [wCurrentMenuItem]
+	call PlaceUnfilledArrowMenuCursor
+
+; pointless because both values are overwritten before they are read
+	ld a, $01
+	ld [wMenuExitMethod], a
+	ld [wChosenMenuItem], a
+
+	xor a
+	ld [wMenuWatchMovingOutOfBounds], a
+	ld a, [wCurrentMenuItem]
+	ld c, a
+	ld a, [wListScrollOffset]
+	add c
+	ld c, a
+	ld a, [wListCount]
+	and a ; is the list empty?
+	jp z, ExitListMenu ; if so, exit the menu
+	dec a
+	cp c ; did the player select Cancel?
+	jp c, ExitListMenu ; if so, exit the menu
+	ld a, c
+	ld [wWhichPokemon], a
+	ld a, [wListMenuID]
+	cp ITEMLISTMENU
+	jr nz, .skipMultiplying
+; if it's an item menu
+	sla c ; item entries are 2 bytes long, so multiply by 2
+.skipMultiplying
+	ld a, [wListPointer]
+	ld l, a
+	ld a, [wListPointer + 1]
+	ld h, a
+	inc hl ; hl = beginning of list entries
+	ld b, 0
+	add hl, bc
+	ld a, [hl]
+	ld [wcf91], a
+	ld a, [wListMenuID]
+	and a ; is it a PC pokemon list?
+	jr z, .pokemonList
+	push hl
+	call GetItemPrice
+	pop hl
+	ld a, [wListMenuID]
+	cp ITEMLISTMENU
+	jr nz, .skipGettingQuantity
+; if it's an item menu
+	inc hl
+	ld a, [hl] ; a = item quantity
+	ld [wMaxItemQuantity], a
+.skipGettingQuantity
+	ld a, [wcf91]
+	ld [wd0b5], a
+	ld a, BANK(ItemNames)
+	ld [wPredefBank], a
+	call GetName
+	jr .storeChosenEntry
+.pokemonList
+	ld hl, wPartyCount
+	ld a, [wListPointer]
+	cp l ; is it a list of party pokemon or box pokemon?
+	ld hl, wPartyMonNicks
+	jr z, .getPokemonName
+	ld hl, wBoxMonNicks ; box pokemon names
+.getPokemonName
+	ld a, [wWhichPokemon]
+	call GetPartyMonName
+.storeChosenEntry ; store the menu entry that the player chose and return
+	ld de, wcd6d
+	call CopyStringToCF4B ; copy name to wcf4b
+	ld a, CHOSE_MENU_ITEM
+	ld [wMenuExitMethod], a
+	ld a, [wCurrentMenuItem]
+	ld [wChosenMenuItem], a
+	xor a
+	ld [hJoy7], a ; joypad state update flag
+	ld hl, wd730
+	res 6, [hl] ; turn on letter printing delay
+	jp BankswitchBack
+.checkOtherKeys ; check B, SELECT, Up, and Down keys
+	bit 1, a ; was the B button pressed?
+	jp nz, ExitListMenu ; if so, exit the menu
+	bit 2, a ; was the select button pressed?
+	jp nz, HandleItemListSwapping ; if so, allow the player to swap menu entries
+	ld b, a
+	bit 7, b ; was Down pressed?
+	ld hl, wListScrollOffset
+	jr z, .upPressed
+.downPressed
+	ld a, [hl]
+	add 3
+	ld b, a
+	ld a, [wListCount]
+	cp b ; will going down scroll past the Cancel button?
+	jp c, DisplayListMenuIDLoop
+	inc [hl] ; if not, go down
+	jp DisplayListMenuIDLoop
+.upPressed
+	ld a, [hl]
+	and a
+	jp z, DisplayListMenuIDLoop
+	dec [hl]
+	jp DisplayListMenuIDLoop
+
+DisplayChooseQuantityMenu::
+; text box dimensions/coordinates for just quantity
+	coord hl, 15, 9
+	ld b, 1 ; height
+	ld c, 3 ; width
+	ld a, [wListMenuID]
+	cp PRICEDITEMLISTMENU
+	jr nz, .drawTextBox
+; text box dimensions/coordinates for quantity and price
+	coord hl, 7, 9
+	ld b, 1  ; height
+	ld c, 11 ; width
+.drawTextBox
+	call TextBoxBorder
+	coord hl, 16, 10
+	ld a, [wListMenuID]
+	cp PRICEDITEMLISTMENU
+	jr nz, .printInitialQuantity
+	coord hl, 8, 10
+.printInitialQuantity
+	ld de, InitialQuantityText
+	call PlaceString
+	xor a
+	ld [wItemQuantity], a ; initialize current quantity to 0
+	jp .incrementQuantity
+.waitForKeyPressLoop
+	call JoypadLowSensitivity
+	ld a, [hJoyPressed] ; newly pressed buttons
+	bit 0, a ; was the A button pressed?
+	jp nz, .buttonAPressed
+	bit 1, a ; was the B button pressed?
+	jp nz, .buttonBPressed
+	bit 6, a ; was Up pressed?
+	jr nz, .incrementQuantity
+	bit 7, a ; was Down pressed?
+	jr nz, .decrementQuantity
+	jr .waitForKeyPressLoop
+.incrementQuantity
+	ld a, [wMaxItemQuantity]
+	inc a
+	ld b, a
+	ld hl, wItemQuantity ; current quantity
+	inc [hl]
+	ld a, [hl]
+	cp b
+	jr nz, .handleNewQuantity
+; wrap to 1 if the player goes above the max quantity
+	ld a, 1
+	ld [hl], a
+	jr .handleNewQuantity
+.decrementQuantity
+	ld hl, wItemQuantity ; current quantity
+	dec [hl]
+	jr nz, .handleNewQuantity
+; wrap to the max quantity if the player goes below 1
+	ld a, [wMaxItemQuantity]
+	ld [hl], a
+.handleNewQuantity
+	coord hl, 17, 10
+	ld a, [wListMenuID]
+	cp PRICEDITEMLISTMENU
+	jr nz, .printQuantity
+.printPrice
+	ld c, $03
+	ld a, [wItemQuantity]
+	ld b, a
+	ld hl, hMoney ; total price
+; initialize total price to 0
+	xor a
+	ld [hli], a
+	ld [hli], a
+	ld [hl], a
+.addLoop ; loop to multiply the individual price by the quantity to get the total price
+	ld de, hMoney + 2
+	ld hl, hItemPrice + 2
+	push bc
+	predef AddBCDPredef ; add the individual price to the current sum
+	pop bc
+	dec b
+	jr nz, .addLoop
+	ld a, [hHalveItemPrices]
+	and a ; should the price be halved (for selling items)?
+	jr z, .skipHalvingPrice
+	xor a
+	ld [hDivideBCDDivisor], a
+	ld [hDivideBCDDivisor + 1], a
+	ld a, $02
+	ld [hDivideBCDDivisor + 2], a
+	predef DivideBCDPredef3 ; halves the price
+; store the halved price
+	ld a, [hDivideBCDQuotient]
+	ld [hMoney], a
+	ld a, [hDivideBCDQuotient + 1]
+	ld [hMoney + 1], a
+	ld a, [hDivideBCDQuotient + 2]
+	ld [hMoney + 2], a
+.skipHalvingPrice
+	coord hl, 12, 10
+	ld de, SpacesBetweenQuantityAndPriceText
+	call PlaceString
+	ld de, hMoney ; total price
+	ld c, $a3
+	call PrintBCDNumber
+	coord hl, 9, 10
+.printQuantity
+	ld de, wItemQuantity ; current quantity
+	lb bc, LEADING_ZEROES | 1, 2 ; 1 byte, 2 digits
+	call PrintNumber
+	jp .waitForKeyPressLoop
+.buttonAPressed ; the player chose to make the transaction
+	xor a
+	ld [wMenuItemToSwap], a ; 0 means no item is currently being swapped
+	ret
+.buttonBPressed ; the player chose to cancel the transaction
+	xor a
+	ld [wMenuItemToSwap], a ; 0 means no item is currently being swapped
+	ld a, $ff
+	ret
+
+InitialQuantityText::
+	db "×01@"
+
+SpacesBetweenQuantityAndPriceText::
+	db "      @"
+
+ExitListMenu::
+	ld a, [wCurrentMenuItem]
+	ld [wChosenMenuItem], a
+	ld a, CANCELLED_MENU
+	ld [wMenuExitMethod], a
+	ld [wMenuWatchMovingOutOfBounds], a
+	xor a
+	ld [hJoy7], a
+	ld hl, wd730
+	res 6, [hl]
+	call BankswitchBack
+	xor a
+	ld [wMenuItemToSwap], a ; 0 means no item is currently being swapped
+	scf
+	ret
+
+PrintListMenuEntries::
+	coord hl, 5, 3
+	ld b, 9
+	ld c, 14
+	call ClearScreenArea
+	ld a, [wListPointer]
+	ld e, a
+	ld a, [wListPointer + 1]
+	ld d, a
+	inc de ; de = beginning of list entries
+	ld a, [wListScrollOffset]
+	ld c, a
+	ld a, [wListMenuID]
+	cp ITEMLISTMENU
+	ld a, c
+	jr nz, .skipMultiplying
+; if it's an item menu
+; item entries are 2 bytes long, so multiply by 2
+	sla a
+	sla c
+.skipMultiplying
+	add e
+	ld e, a
+	jr nc, .noCarry
+	inc d
+.noCarry
+	coord hl, 6, 4 ; coordinates of first list entry name
+	ld b, 4 ; print 4 names
+.loop
+	ld a, b
+	ld [wWhichPokemon], a
+	ld a, [de]
+	ld [wd11e], a
+	cp $ff
+	jp z, .printCancelMenuItem
+	push bc
+	push de
+	push hl
+	push hl
+	push de
+	ld a, [wListMenuID]
+	and a
+	jr z, .pokemonPCMenu
+	cp MOVESLISTMENU
+	jr z, .movesMenu
+.itemMenu
+	call GetItemName
+	jr .placeNameString
+.pokemonPCMenu
+	push hl
+	ld hl, wPartyCount
+	ld a, [wListPointer]
+	cp l ; is it a list of party pokemon or box pokemon?
+	ld hl, wPartyMonNicks
+	jr z, .getPokemonName
+	ld hl, wBoxMonNicks ; box pokemon names
+.getPokemonName
+	ld a, [wWhichPokemon]
+	ld b, a
+	ld a, 4
+	sub b
+	ld b, a
+	ld a, [wListScrollOffset]
+	add b
+	call GetPartyMonName
+	pop hl
+	jr .placeNameString
+.movesMenu
+	call GetMoveName
+.placeNameString
+	call PlaceString
+	pop de
+	pop hl
+	ld a, [wPrintItemPrices]
+	and a ; should prices be printed?
+	jr z, .skipPrintingItemPrice
+.printItemPrice
+	push hl
+	ld a, [de]
+	ld de, ItemPrices
+	ld [wcf91], a
+	call GetItemPrice ; get price
+	pop hl
+	ld bc, SCREEN_WIDTH + 5 ; 1 row down and 5 columns right
+	add hl, bc
+	ld c, $a3 ; no leading zeroes, right-aligned, print currency symbol, 3 bytes
+	call PrintBCDNumber
+.skipPrintingItemPrice
+	ld a, [wListMenuID]
+	and a
+	jr nz, .skipPrintingPokemonLevel
+.printPokemonLevel
+	ld a, [wd11e]
+	push af
+	push hl
+	ld hl, wPartyCount
+	ld a, [wListPointer]
+	cp l ; is it a list of party pokemon or box pokemon?
+	ld a, PLAYER_PARTY_DATA
+	jr z, .next
+	ld a, BOX_DATA
+.next
+	ld [wMonDataLocation], a
+	ld hl, wWhichPokemon
+	ld a, [hl]
+	ld b, a
+	ld a, $04
+	sub b
+	ld b, a
+	ld a, [wListScrollOffset]
+	add b
+	ld [hl], a
+	call LoadMonData
+	ld a, [wMonDataLocation]
+	and a ; is it a list of party pokemon or box pokemon?
+	jr z, .skipCopyingLevel
+.copyLevel
+	ld a, [wLoadedMonBoxLevel]
+	ld [wLoadedMonLevel], a
+.skipCopyingLevel
+	pop hl
+	ld bc, $001c
+	add hl, bc
+	call PrintLevel
+	pop af
+	ld [wd11e], a
+.skipPrintingPokemonLevel
+	pop hl
+	pop de
+	inc de
+	ld a, [wListMenuID]
+	cp ITEMLISTMENU
+	jr nz, .nextListEntry
+.printItemQuantity
+	ld a, [wd11e]
+	ld [wcf91], a
+	call IsKeyItem ; check if item is unsellable
+	ld a, [wIsKeyItem]
+	and a ; is the item unsellable?
+	jr nz, .skipPrintingItemQuantity ; if so, don't print the quantity
+	push hl
+	ld bc, SCREEN_WIDTH + 8 ; 1 row down and 8 columns right
+	add hl, bc
+	ld a, "×"
+	ld [hli], a
+	ld a, [wd11e]
+	push af
+	ld a, [de]
+	ld [wMaxItemQuantity], a
+	push de
+	ld de, wd11e
+	ld [de], a
+	lb bc, 1, 2
+	call PrintNumber
+	pop de
+	pop af
+	ld [wd11e], a
+	pop hl
+.skipPrintingItemQuantity
+	inc de
+	pop bc
+	inc c
+	push bc
+	inc c
+	ld a, [wMenuItemToSwap] ; ID of item chosen for swapping (counts from 1)
+	and a ; is an item being swapped?
+	jr z, .nextListEntry
+	sla a
+	cp c ; is it this item?
+	jr nz, .nextListEntry
+	dec hl
+	ld a, $ec ; unfilled right arrow menu cursor to indicate an item being swapped
+	ld [hli], a
+.nextListEntry
+	ld bc, 2 * SCREEN_WIDTH ; 2 rows
+	add hl, bc
+	pop bc
+	inc c
+	dec b
+	jp nz, .loop
+	ld bc, -8
+	add hl, bc
+	ld a, "▼"
+	ld [hl], a
+	ret
+.printCancelMenuItem
+	ld de, ListMenuCancelText
+	jp PlaceString
+
+ListMenuCancelText::
+	db "CANCEL@"