source: xtideuniversalbios/trunk/Configurator/Src/Libraries/menu/menumsg.asm@ 15

Last change on this file since 15 was 2, checked in by Tomi Tilli, 15 years ago
File size: 8.8 KB
Line 
1; File name : menumsg.asm
2; Project name : Menu library
3; Created date : 13.11.2009
4; Last update : 10.1.2010
5; Author : Tomi Tilli
6; Description : ASM library to menu system.
7; Contains functions for displaying messages.
8
9;--------------- Equates -----------------------------
10
11; Control characters for Menu Message string.
12; Normal control characters cannot be used since message string
13; will be tokenized and converted to menuitems.
14%define MNU_NL " |n " ; Menu newline defined as token string
15W_MNU_NL EQU "|n" ; Menu newline defined as WORD
16
17; Total border chars on left and right side of string menuitem
18SIZE_MSG_HBRDR EQU 4 ; Horizontal border size
19
20; Message variables. This is an expanded MENUVARS struct.
21struc MSGVARS
22 .menuVars resb MENUVARS_size
23 .dwStrPtr: ; Far pointer to string to display
24 .wStrOff: resb 2 ; Offset to string to display
25 .wStrSeg: resb 2 ; Segment to string to display
26endstruc
27
28
29;-------------- Private global variables -------------
30; Section containing initialized data
31;SECTION .data
32
33
34;-------------- Public functions ---------------------
35; Section containing code
36SECTION .text
37
38;--------------------------------------------------------------------
39; Displays message string.
40;
41; MenuMsg_ShowMessage
42; Parameters:
43; BL: Dialog width with borders included
44; SS:BP: Ptr to MENUVARS
45; ES:DI: Ptr to STOP terminated string to display
46; Returns:
47; Nothing
48; Corrupts registers:
49; AX, BX, CX, DX
50;--------------------------------------------------------------------
51ALIGN JUMP_ALIGN
52MenuMsg_ShowMessage:
53 ; Create stack frame
54 eENTER MSGVARS_size, 0
55 sub bp, MSGVARS_size ; Point to MSGVARS
56
57 ; Initialize menu variables
58 mov [bp+MENUVARS.bWidth], bl ; Menu size
59 mov WORD [bp+MENUVARS.wTopDwnH], 0 ; Title and Info size
60 mov WORD [bp+MENUVARS.fnEvent], MenuMsg_MsgEvent
61 mov [bp+MSGVARS.wStrOff], di ; Store far ptr...
62 mov [bp+MSGVARS.wStrSeg], es ; ...to string to display
63
64 ; Enter menu
65 call MenuMsg_GetLineCnt ; Get message line count to CX
66 mov ax, CNT_SCRN_ROW-2 ; Load max line rows to AX
67 MIN_U ax, cx ; String lines to display to AX
68 times 2 inc ax ; Include borders for dlg height
69 mov [bp+MENUVARS.bHeight], al ; Store dialog height
70 call MenuCrsr_GetCenter ; Get X and Y coordinates to DX
71 xor ax, ax ; Selection timeout (disable)
72 mov bl, FLG_MNU_NOARRW ; Menu flags
73 call Menu_Init ; Returns only after dlg closed
74
75 ; Return
76 add bp, MSGVARS_size ; Point to old BP
77 eLEAVE ; Destroy stack frame
78 ret
79
80
81;-------------- Private functions ---------------------
82
83;--------------------------------------------------------------------
84; Calculates number of string lines needed by string to display.
85;
86; MenuMsg_GetLineCnt
87; Parameters:
88; SS:BP: Ptr to MSGVARS
89; ES:DI: Ptr to STOP terminated string to display
90; Returns:
91; CX: Number of lines needed
92; Corrupts registers:
93; AX, BX, DX
94;--------------------------------------------------------------------
95ALIGN JUMP_ALIGN
96MenuMsg_GetLineCnt:
97 push di
98
99 ; Get index for last line
100 mov cx, -1 ; Get last possible line
101 call MenuMsg_GetTokenForLine
102 inc cx ; Last index to line count
103
104 ; Return
105 pop di
106 ret
107
108
109;--------------------------------------------------------------------
110; Check if line has space for token.
111;
112; MenuMsg_HasLineSpace
113; Parameters:
114; AX: Token length in characters
115; DX: Characters left on line
116; ES:DI: Ptr to token string (not terminated!)
117; Returns:
118; DX: Chars left after token + space at the end
119; CF: Set if space left for token
120; Cleared if not enough space
121; Corrupts registers:
122; Nothing
123;--------------------------------------------------------------------
124ALIGN JUMP_ALIGN
125MenuMsg_HasLineSpace:
126 sub dx, ax
127 jl .NoSpace
128 cmp WORD [es:di], W_MNU_NL ; Newline token?
129 je .NoSpace ; If so, end line
130 dec dx ; Decrement for space after token
131 stc ; Set CF since space left
132 ret
133ALIGN JUMP_ALIGN
134.NoSpace:
135 xor dx, dx ; Clear space left and CF
136 ret
137
138
139;--------------------------------------------------------------------
140; Return pointer to first token for wanted message line.
141;
142; MenuMsg_GetTokenForLine
143; Parameters:
144; CX: Line index
145; ES:DI: Ptr to STOP terminated string to display
146; SS:BP: Ptr to MSGVARS
147; Returns:
148; AX: Length of first token in characters
149; CX: Index of last line found (if wanted line not found)
150; ES:DI: Ptr to token
151; CF: Set if message line found
152; Cleared if message line not found
153; Corrupts registers:
154; BX, DX
155;--------------------------------------------------------------------
156ALIGN JUMP_ALIGN
157MenuMsg_GetTokenForLine:
158 test cx, cx ; Line 0 wanted?
159 jz .GetFirst ; If so, just get token length
160 push bp
161 push si
162
163 ; Prepare to scan tokens
164 eMOVZX si, [bp+MENUVARS.bWidth]
165 sub si, SIZE_MSG_HBRDR ; Max number of chars per line
166 mov dx, si ; Initialize chars left on line
167 mov bp, cx ; Copy line index to BP
168 xor bx, bx ; Zero line index counter
169 xor ax, ax ; Zero token length
170
171 ; Scan all tokens to calculate lines needed
172ALIGN JUMP_ALIGN
173.TokenLoop:
174 ; Get token and length
175 xor cx, cx ; Always read token at index 0
176 add di, ax ; Increment offset for next token
177 call String_StrToken ; Get token length to AX, ptr to ES:DI
178 jnc .Return ; Return if no more tokens (CF cleared)
179 ; Check does line have space left for token
180 call MenuMsg_HasLineSpace
181 jc .TokenLoop ; Space left, check next token
182 ; Change to next line
183 mov dx, si ; Copy max chars on line
184 call MenuMsg_HasLineSpace; Update chars left
185 inc bx ; Increment line index
186 cmp bx, bp ; Correct line found?
187 jne .TokenLoop ; If not, check more tokens
188 stc ; Set CF since line found
189ALIGN JUMP_ALIGN
190.Return:
191 mov cx, bx ; Copy idx of last line found to CX
192 pop si
193 pop bp
194 ret
195ALIGN JUMP_ALIGN
196.GetFirst:
197 jmp String_StrToken ; Get token length to AX, ptr to ES:DI
198
199
200;--------------------------------------------------------------------
201; Message dialog menu event handler.
202;
203; MenuMsg_WriteLine
204; Parameters:
205; CX: Index of line to display
206; ES:DI: Ptr to STOP terminated string to display
207; SS:BP: Ptr to MSGVARS
208; Returns:
209; CF: Set if end of string
210; Cleared if string has unwritten tokens
211; Corrupts registers:
212; AX, BX, CX, DX
213;--------------------------------------------------------------------
214ALIGN JUMP_ALIGN
215MenuMsg_WriteLine:
216 push di
217 call MenuMsg_GetTokenForLine ; Get ptr to first token, length to AX
218 jnc .EndOfString ; Return if no tokens
219 eMOVZX dx, BYTE [bp+MENUVARS.bWidth] ; Menu width
220 sub dl, SIZE_MSG_HBRDR ; To line length
221 mov bl, ' ' ; Space character
222ALIGN JUMP_ALIGN
223.PrintToken:
224 ; Check if space for token
225 call MenuMsg_HasLineSpace ; Space left on line?
226 jnc .PrintDone ; If not, all done
227 ; Print token
228 push ax ; Store token length
229 mov cx, ax ; Copy token length to CX
230 call Print_CharBuffer ; Print token
231 xchg dx, bx ; Space char to DL
232 PRINT_CHAR
233 xchg dx, bx ; Restore DX
234 pop ax ; Pop token length
235 ; Get next token
236 add di, ax ; Point to next token
237 xor cx, cx ; Get token at index 0
238 call String_StrToken ; Get next token to ES:DI, len to AX
239 jc .PrintToken ; Print while tokens left
240ALIGN JUMP_ALIGN
241.EndOfString: ; Last token written
242 stc
243ALIGN JUMP_ALIGN
244.PrintDone: ; End of line but tokens left
245 pop di
246 ret
247
248
249;--------------------------------------------------------------------
250; Message dialog menu event handler.
251;
252; MenuMsg_MsgEvent
253; Parameters:
254; BX: Callback event
255; CX: Selected menuitem index
256; DX: Event parameter (event specific)
257; SS:BP: Ptr to MSGVARS
258; Returns:
259; AH: Event specific or unused
260; AL: 1=Event processed
261; 0=Event not processed (default action if any)
262; Corrupts registers:
263; BX, CX, DX
264;--------------------------------------------------------------------
265ALIGN JUMP_ALIGN
266MenuMsg_MsgEvent:
267 cmp bx, EVNT_MMU_SELCHG ; Selection changed?
268 je .RetProcessed ; If so, return
269 cmp bx, EVNT_MNU_SELSET ; Enter to close dialog?
270 je .CloseDialog ; If so, jump to close dialog
271 cmp bx, EVNT_MNU_UPD ; Draw menuitem string?
272 je .DrawLine ; If so, jump to draw
273 cmp bx, EVNT_MNU_KEY ; Any key pressed to close dialog?
274 jne .RetUnhandled ; If not, ignore message
275
276 ; Close dialog since key pressed
277ALIGN JUMP_ALIGN
278.CloseDialog:
279 or BYTE [bp+MENUVARS.bFlags], FLG_MNU_EXIT ; Any key, exit
280ALIGN JUMP_ALIGN
281.RetUnhandled:
282 xor ax, ax
283 ret
284
285ALIGN JUMP_ALIGN
286.DrawLine:
287 push es
288 push di
289
290 ; Print string line
291 mov di, [bp+MSGVARS.wStrOff]; Load string offset
292 mov es, [bp+MSGVARS.wStrSeg]; Load string segment
293 call MenuMsg_WriteLine
294 pop di
295 pop es
296ALIGN JUMP_ALIGN
297.RetProcessed:
298 mov ax, 1 ; Event processed
299 ret
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