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Assembly Source File | 1991-09-03 | 54.3 KB | 1,352 lines

;============================================================================ ; Mouse interface for QuickBASIC V4.x, Microsoft BASIC 6.X, and the ; Microsoft BASIC Professional Development System 7.X. ; ; Written by Tony Elliott (CIS 76220,2575) ; ; For QBNews in March, 1991 and released into the Public Domain. ; ; Assemble using MASM 5.1 ;=========================================================================== .Model Medium, Basic .Code _MouseCode ; We store our variables in our code segment to keep them out of DGROUP. MouseButtons db 0 ;Our "initialized" flag PixelsOn db 0 ;If <> 0, return coordinates in pixels StateSegment dw 0 ;Memory segment where mouse state is stored SaveBytes dw 0 ;Number of bytes required to save state OnExitSet db 0 ;Indicates successful call to B_OnExit UEventActive db 0 ;-1 if our mouse event handler is active EventCause dw 0 ;The cause of the event ButtonState dw 0 ;When mouse event hits, button state, VertPos dw 0 ; vertical and horizontal locations stored HorizPos dw 0 ; here until fetched by programmer. Extrn B$SETM :Far ;BASIC's SETMEM routine Extrn SetUEvent :Far ;Sets a BASIC flag that triggers a UEVENT. Extrn B_OnExit :Far ;BASIC's routine to set procs to be called ; on program restart or termination. ;--------------------------------------------------------------------------- MousePixelsOn proc ;Sets an internal flag which tells us to return mouse corrdinates in ;pixel format. The default is to return base 1 row/column coordinates ;like BASIC uses. Use the routine MousePixelsOff to reset the ;coordinate system back to row/columns. ;From BASIC: ; ; DECLARE SUB MousePixelsOn () 'This is optional ; ; CALL MousePixelsOn 'Or, when the declare is present, ; MousePixelsOn mov byte ptr cs:PixelsOn, -1 ;Turn the flag on ret ;That was easy, wasn't it? MousePixelsOn endp ;--------------------------------------------------------------------------- MousePixelsOff proc ;Sets an internal flag which tells us to return mouse corrdinates in ;base 1 row/column format. This the default. You need to call this routine ;only if you have previously called the MousePixelsOn routine and you ;wish to return to row/column coordinates. ;From BASIC: ; ; DECLARE SUB MousePixelsOff () 'This is optional ; ; CALL MousePixelsOff 'Or, when the declare is present, ; MousePixelsOff mov byte ptr cs:PixelsOn,0 ;Set the flag to OFF. ret MousePixelsOff endp ;--------------------------------------------------------------------------- MouseReset proc ; Initializes the mouse. The mouse driver is initialized to the ; following state: ; ; - Mouse pointer is at the center of the screen ; - Display page for mouse set to 0 ; - Mouse pointer is hidden (off) ; - Mouse pointer shape is the default arrow shape in the graphics ; video modes or a reverse block in the text modes. ; From BASIC: ; ; DECLARE FUNCTION MouseReset% () ; ; NumberOfButtons% = MouseReset% ; IF NumberOfButtons% THEN ; PRINT "Mouse with";NumberOfButtons%;"buttons is installed and reset." ; ELSE ; PRINT "Mouse not detected." ; END IF xor ax,ax ;Function 0 int 33h ;Returns number of buttons in bx or bx,bx ;Is bx non-zero? jz @F ;No. Mouse not detected. Get out. mov cs:MouseButtons,bl ;Mouse was detected. Store # buttons. push cs ;Setup for call to B_OnExit. Push mov cx,offset MouseExit ; segment and offset of our clean- push cx ; up routine onto the stack. call B_OnExit ;Tell BASIC to stick it (in its table) mov al,cs:MouseButtons ;Move # of buttons into ax for return xor ah,ah ;Zero ah @@: ret ;Back to BASIC. Contents of AX is ;returned as function result. MouseReset endp ;----------------------------------------------------------------------------- MouseAlreadyReset proc ;Returns the number of button the mouse has -if- the driver has already ;been reset, otherwise it returns zero. This routine provides an easy ;method of determining if the mouse driver has already been reset by the ;current program. ;From BASIC: ; ;DECLARE FUNCTION MouseAlreadyReset% () ;Buttons% = MouseAlreadyReset% ;IF Buttons% THEN ; PRINT "Mouse with";Buttons%;" buttons has already been reset!" ;ELSE ; PRINT "Mouse has not yet been reset." ;END IF xor ah,ah ;Zero AH mov al,cs:MouseButtons ;Number of buttons into al ret ;Returns AX as result of integer function MouseAlreadyReset endp ;----------------------------------------------------------------------------- MouseInstalled proc uses ds ;Check to see if a mouse is installed WITHOUT resetting it. The ;MouseReset function will still have to be invoked before the other ;mouse routines will function. ;From BASIC: ; ; DECLARE FUNCTION MouseInstalled% () ; ; IF MouseInstalled% THEN ; PRINT "A mouse IS installed." ; ELSE ; PRINT "A mouse was not detected." ; END IF cmp cs:MouseButtons,0 ;Have we already initialized it? jz @F ;If not, continue the check. mov ax,-1 ;It has been reset so it must be jmp short ExitInstall ;installed. Set return to -1 (TRUE). @@: xor ax,ax ;Zero ax assume ds:nothing mov ds,ax ;Move that into ds referencing the IVT mov bx,ds:[0cch] ;Offset of Int 33h (mouse) into bx mov cx,ds:[0ceh] ;Segment of Int 33h into cx or cx,cx ;Is segment zero? jz ExitInstall ;If so, exit mov ds,cx ;Point ds to segment of Int 33h handler cmp byte ptr ds:[bx],0cfh ;Is the handler pointing to an IRET? jz ExitInstall ;If so, no mouse driver loaded. Exit. not ax ;If it's not an IRET then it must be ; a valid driver. Return -1 (TRUE). ExitInstall: ret ;Back to BASIC. MouseInstalled endp ;------------------------------------------------------------------------------ MousePointerOn proc ;Displays the mouse pointer (cursor) and cancels any previous mouse ;exclusion area defined with the routine MouseSetExclusionArea. ;Note: Each time this routine is called, the mouse driver increments an ; internal counter. The MousePointerOff routine decrements the ; counter. The MouseReset routine set the counter to an initial ; value of -1. While the counter < 0 the mouse pointer will be ; hidden and when the counter >= 0 the pointer is visible. ; In other words, if MousePointerOff was called three ; successive times, MousePointerOn would have to be called three ; times before the pointer would be physically turned back on. ;From BASIC: ; ; DECLARE SUB MousePointerOn () 'This is optional. ; ; CALL MousePointerOn 'Or, if you used the DECLARE, simply ; MousePointerOn cmp cs:MouseButtons,0 ;Has the mouse been initialized? jz @F ;If not, exit. mov ax,1 ;Function 1 - Show pointer int 33h ;Call the mouse driver. @@: ret ;Back to BASIC. MousePointerOn endp ;----------------------------------------------------------------------------- MousePointerOff proc ;This routine makes the mouse pointer visible. Please see the special ;note under the MousePointerOn routine for details about the mouse ;driver's internal counter. ;Note: Even though the mouse pointer is not visible, the driver ; continues to track the mouse pointer position. ;From BASIC: ; ; DECLARE SUB MousePointerOff () 'This is optional. ; ; CALL MousePointerOff 'Or, if you used the DECLARE, simply ; MousePointerOff cmp cs:MouseButtons,0 ;Has the mouse been initialized? jz @F ;If not, exit. mov ax,2 ;Function 2 - Show mouse pointer int 33h ;Call the mouse driver. @@: ret ;Back to BASIC MousePointerOff endp ;----------------------------------------------------------------------------- MouseGetStatus proc, Lb:word, Rb:Word, Cb:Word, Row:Word, Column:Word ;Returns the current "real time" state of the mouse buttons and the ;mouse pointers current position in row/column coordinates. A value ;of -1 (TRUE) returned for Lb%, Rb% or Cb% indicates that the ;respective button is currently pressed and a value of zero (FALSE) ;indicates the button is not pressed. ;From BASIC: ; ; DECLARE SUB MouseGetStatus(Lb%, Rb%, Cb%, Row%, Column%) 'Optional ; ; CALL MouseGetStatus(Lb%, Rb%, Cb%, Row%, Column%) 'Or ; MouseGetStatus Lb%, Rb%, Cb%, Row%, Column% xor ax,ax ;Assume all buttons off mov bx,ax mov cx,ax ;Row/Column 0 mov dx,ax cmp cs:MouseButtons,0 ;Mouse initialized? jz @F ;If not, exit. mov ax,3 ;Function 3 - Get status int 33h ;Call the mouse driver call _CommonFromPixels @@: call _SetupReturn ret ;Back to BASIC MouseGetStatus endp ;----------------------------------------------------------------------------- MouseSetPointer proc, Row:Word, Column:Word ; Set the mouse pointer position. The format for the coordinates is ; based on the most recent call to either of MousePixelsOn or ; MousePixelsOff. If neither have been previously called, row/column ; coordinates is the default. ; If coordinates provided are outside the physical screen or outside of ; the vertical or horizontal limits set by the MouseSetWindow routine, ; the coordinates are adjusted automatically. ; From BASIC: ; ; DECLARE SUB MouseSetPointer(Row%, Column%) 'Optional ; ; CALL MouseSetPointer(Row%, Column%) 'Or, if using the declare, ; MouseSetPointer Row%, Column% cmp cs:MouseButtons,0 ;Has the mouse been initialized? jz @F ;If not, exit. assume ds:dgroup mov bx,[Row] ;Pointer to Row (Vertical) into bx mov dx,[bx] ;Row% into dx mov bx,[Column] ;Pointer to Column into bx mov cx,[bx] ;Column% into cx call _CommonToPixels ;Convert to pixels, if necessary mov ax,4 ;Mouse function 4 - Set position int 33h ;Call the mouse driver @@: ret ;Back to BASIC. MouseSetPointer endp ;----------------------------------------------------------------------------- MousePressInfo proc, Button:Word, Row:Word, Column:Word ; Returns the number of times the specified mouse button has been ; pressed since the last time this routine was called. It also returns ; the position where the specified button was pressed. ; From BASIC: ; ; DECLARE FUNCTION MousePressInfo% (Button%, Row%, Column%) ; ; NumberOfPresses% = MousePressInfo%(Button%,Row%,Column%) ; ; On entry, Button% = 0 for the left button ; 1 for the right button ; 2 for the center button (if any) ; ; On exit, the result of the function indicates the number of times ; the specified button has been pressed since this routine was last ; called. Row% and Column% will contain the coordinates where the ; specified button was last pressed. The current coordinate system ; is used (See MousePixelsOn and MousePixelsOff). ;This block of code is used by the MousePressInfo and the MouseReleaseInfo ;routines. BX contains the function number (5 for PressInfo or 6 for ;release info). The common entry point is CommonButtonInfo. mov bx,5 ;Function 5 - Get pressed info CommonButtonInfo:: ;Both colons are supposed to be there xor ax,ax ;Zero our return registers in case mov cx,ax ;mouse has not been initialized. This mov dx,ax ;way, we'll return all zeros. cmp cs:MouseButtons,0 ;Has the mouse been initialized? jz @F ;If not, exit mov ax,bx ;Put function number into ax mov bx,[Button] ;Pointer to Button% into bx mov bx,[bx] ;Button% value into bx int 33h ;Call the mouse driver push bx ;Save bx call _CommonFromPixels ;Convert pixels to row/columns, if needed pop ax @@: mov bx,[Row] ;Pointer to Row% into bx mov [bx],dx ;Vertical position into Row% mov bx,[Column] ;Pointer to Column% into bx mov [bx],cx ;Horizontal position into Column% ret ;Number of presses in ax returned as ; result of function. MousePressInfo endp ;----------------------------------------------------------------------------- MouseReleaseInfo proc, Button:Word, Row:Word, Column:Word ; Returns the number of times the specified mouse button has been ; released since the last time this routine was called. It also returns ; the position where the specified button was last released. ; From BASIC: ; ; DECLARE FUNCTION MouseReleaseInfo% (Button%, Row%, Column%) ; ; NumberOfReleases% = MouseReleaseInfo%(Button%,Row%,Column%) ; ; On entry, Button% = 0 for the left button ; 1 for the right button ; 2 for the center button (if any) ; ; On exit, the result of the function indicates the number of times ; the specified button has been released since this routine was last ; called. Row% and Column% will contain the coordinates where the ; specified button was last released. The current coordinate system ; is used (See MousePixelsOn and MousePixelsOff). mov bx,6 ;Function 6 - Get Release info jmp short CommonButtonInfo MouseReleaseInfo endp ;----------------------------------------------------------------------------- MouseSetWindow proc,TopRow:Word,LeftColumn:Word,BottomRow:Word,RightColumn:Word ; Set the coordinates for a window in which the mouse pointer is allowed ; to move. By default, the pointer is allowed to move freely over the ; entire screen. This routine allows you to limit the mouse pointer's ; movement to a specific rectangular area of the screen. ; From BASIC: ; ; DECLARE SUB MouseSetWindow(TopRow%, LeftColumn%, BottomRow%,_ ; RightColumn%) ; ; CALL MouseSetWindow(10, 10, 20, 70) cmp cs:MouseButtons,0 ;Has the mouse been initialized? jz @F ;If not, exit mov bx,[BottomRow] ;Pointer to BottomRow% into bx mov dx,[bx] ;BottomRow% into dx mov bx,[RightColumn] ;Pointer to RightColumn% into bx mov cx,[bx] ;RightColumn% into cx call _CommonToPixels ;Convert to pixels, if needed push dx ;Save BottomRow and RightColumn push cx ; on stack until needed later. mov bx,[TopRow] ;Pointer to TopRow% into bx mov dx,[bx] ;TopRow% into dx mov bx,[LeftColumn] ;Pointer to LeftColumn% into bx mov cx,[bx] ;LeftColumn% into cx call _CommonToPixels ;Convert to pixels, if needed mov bx,dx ;Hold TopRow in bx for now pop dx ;RightColumn coordinate into dx mov ax,7 ;Function 7 - Set horizontal limits int 33h ;Call mouse driver mov cx,bx ;TopRow into cx pop dx ;BottomRow into dx mov ax,8 ;Function 8 - Set vertical limits int 33h ;Call mouse driver @@: ret MouseSetWindow endp ;----------------------------------------------------------------------------- MouseSetHardwarePointer proc uses si, StartScan:Word, EndScan:Word ; Defines the shape and characteristics of the mouse pointer used in ; text video modes. The "hardware" cursor is simply a character block ; which the programmer can control the starting scan line ; and the ending scan line (i.e., the size and shape of the ; block). When the hardware cursor is moved over the screen, it appears ; as a blinking block. ;From BASIC: ; ; DECLARE SUB MouseSetHardwarePointer(StartScan%, EndScan%) ; ; CALL MouseSetHardwarePointer(0, 7) mov bx,1 ;Set hardware cursor ; The following code is shared between MouseSetHardwarePointer and ; MouseSetSoftwarePointer. CommonSetCursor:: ;Both colons are supposed to be there cmp cs:MouseButtons,0 ;Has the mouse been initialized? jz @F ;If not, exit. mov ax,0ah ;Function 0Ah - Set pointer attributes mov si,[StartScan] ;Offset of Param1 into si mov cx,[si] ;Param1 into cx (StartScan or AND mask) mov si,[EndScan] ;Offset of Param1 into si mov dx,[si] ;Param2 into dx (EndScan or XOR mask) int 33h ;Call mouse driver @@: ret MouseSetHardwarePointer endp ;----------------------------------------------------------------------------- MouseSetSoftwarePointer proc uses si, AndMask:Word, XorMask:Word ; Sets characteristics of mouse "software" pointer. This type of pointer ; is used only in text modes and physically manipulates whatever character ; and attribute that is under it. The values passed in Param1 (AND mask) ; and in Param2 (XOR mask) determine exactly how the character and ; attribute will be manipulated. ;From BASIC: ; ; DECLARE SUB MouseSetSoftwarePointer (AndMask%, XorMask%) ; ; CALL MouseSetSoftwarePointer(&H77ff, &H7700) ; The AND mask determines what part of the character/attribute pair ; will be passed through and the XOR mask determines which of the ; resulting bits will be toggled. In each case, the low byte of the ; integer applies to the character and the high bytes applies to the ; attribute. mov bx, 0 jmp short CommonSetCursor MouseSetSoftwarePointer endp ;----------------------------------------------------------------------------- MouseMovement proc, Rows:Word, Columns:Word ; Returns the net mouse displacement since the last call to this routine. ; In other words, it tells you how many "mickeys" (approx 1/200th of an ; inch) the mouse has moved from it's position the last time this routine ; was called. ; From BASIC: ; ; DECLARE SUB MouseMovement (Rows%, Columns%) ; ; CALL MouseMovement (Rows%, Columns%) xor cx,cx ;Zero cx and dx so zeros will be mov dx,cx ;returned if mouse not initialized cmp cs:MouseButtons,0 ;Has the mouse been initialized? jz @F ;If not, exit. mov ax,0bh ;Function 0Bh - Read movement counters int 33h ;Call mouse driver @@: mov bx,[Rows] ;Pointer to Rows% into bx mov [bx],dx ;Vertical movement into Rows% mov bx,[Columns] ;Pointer to Columns into bx mov [bx],cx ;Horizontal movement into Columns% ret ;Back to BASIC. MouseMovement endp ;----------------------------------------------------------------------------- MouseSetRatio proc, VertRatio:word, HorizRatio:Word ; Sets the ratio between the amount mouse physical mouse movement ; (mickeys) and the amount of movement reflect by the mouse pointer ; on the screen. The value passed in reflects the number of mickeys ; required to move the pointer 8 pixels. The default is 8 mickeys per ; 8 pixels (1 mickey per pixel) horizontal and 16 mickeys per 8 pixels ; (2 mickeys per pixel) of vertical movement. A value between ; 1 and 32767 mickeys can be specified. ;From BASIC: ; ; DECLARE SUB MouseSetRatio (VertRatio%, HorizRatio%) 'Optional ; ; CALL MouseSetRatio(8, 4) 'Doubles mouse sensitivity cmp cs:MouseButtons,0 ;Has the mouse been initialized? jz @F ;If not, exit. mov bx,[VertRatio] ;Pointer to VertRatio% into bx mov dx,[bx] ;VertRatio% into dx mov bx,[HorizRatio] ;Pointer to HorizRatio% into bx mov cx,[bx] ;HorizRatio% into cx mov ax,0fh ;Function 0Fh - Set mickey/pixel ratio int 33h ;Call mouse driver @@: ret ;Back to BASIC MouseSetRatio endp ;----------------------------------------------------------------------------- MouseSetExclusionArea proc uses si di, TopRow:Word, LeftColumn:Word, BottomRow:Word, RightColumn:Word ; If the mouse pointer is moved into the rectangular area of the screen ; defined by this routine, the mouse pointer will be turned off. ;From BASIC: ; ; DECLARE SUB MouseSetExclusionArea (TopRow%, LeftColumn%, BottomRow%,_ ; RightColumn%) ; ; CALL MouseSetExclusionArea (1, 1, 3, 80) cmp cs:MouseButtons,0 ;Has the mouse been initialized? jz @F ;If not, exit. mov bx,[BottomRow] mov dx,[bx] ;BottomRow% into dx mov bx,[RightColumn] mov cx,[bx] ;RightColumn into cx call _CommonToPixels ;Convert to pixels, if needed. mov si,cx ;Move bottom/right coordinates into mov di,dx ; si and di. mov bx,[TopRow] mov dx,[bx] ;TopRow% into dx mov bx,[LeftColumn] mov cx,[bx] ;LeftColumn% into cx call _CommonToPixels ;Convert to pixels, if needed mov ax,10h ;Function 10h - Set exclusion area int 33h ;Call mouse driver. @@: ret ;Back to BASIC. MouseSetExclusionArea endp ;----------------------------------------------------------------------------- MouseSetDblSpd proc, MickeysPerSecond:Word ; Sets the mouse pointer "double speed threshold". If the mouse is moved ; faster than the specified number of MickeysPerSecond, the mouse pointer ; will kick into overdrive and effectively move twice as fast. The ; default is 64 Mickeys (approx 1/3 inch) per second. ; Passing a large value (such as 10,000) effectively disables the ; speed doubling effect. ;From BASIC: ; ; DECLARE SUB MouseSetDblSpeed (MickeysPerSecond%) ; ; CALL MouseSetDblSpeed(200) 'Set it to 1 inch per second cmp cs:MouseButtons,0 ;Has mouse been initialized? jz @F ;If not, exit. mov bx,[MickeysPerSecond] mov dx,[bx] ;MickeysPerSecond% into dx mov ax,13h ;Function 13h - Set double speed threshold int 33h ;Call the mouse driver @@: ret ;Back to BASIC MouseSetDblSpd endp ;----------------------------------------------------------------------------- MouseWaitForRelease proc ; Waits for all mouse buttons to be released before returning control ; to the calling program. ;From BASIC: ; ; DECLARE SUB MouseWaitForRelease () 'Optional ; ; CALL MouseWaitForRelease 'Or, if declare is present, ; MouseWaitForRelease cmp cs:MouseButtons,0 ;Has the mouse been initialized? jz WaitReleaseExit ;If not, exit. @@: mov ax,3 ;Function 3 - Get mouse status int 33h ;Call Mouse driver. test bl,7 ;Are bit 0, 1 and 2 all off? jnz @B ;If not, loop until they are. WaitReleaseExit: ret ;Back to BASIC. MouseWaitForRelease endp ;----------------------------------------------------------------------------- MouseSaveState proc ; Save the current mouse state including, position, visibility, and ; other characteristics. You could use this routine prior to SHELLing ; another program which could use the mouse. ; The MouseRestoreState routine restores the previous state of the mouse. ; This routine make a call to BASIC's SETMEM code to release enough ; memory to DOS to save the mouse state. When the MouseRestoreState ; routine is CALLed, the memory is released from DOS and given back ; to BASIC. ; Note: This routine can be DECLAREd as a SUB or a FUNCTION. If declared ; as an integer FUNCTION, -1 (TRUE) is returned if the state was ; saved successfully and 0 (FALSE) if unsuccessful (due to ; insufficient memory). If you don't care about the success or ; failure of the operation, you can simply DECLARE it as a SUB ; without parameters. ; ;From BASIC: ; ; DECLARE SUB MouseSaveState () ; CALL MouseSaveState ; -or- ; DECLARE FUNCTION MouseSaveState% () ; IF MouseSaveState% THEN ; PRINT "Mouse state saved successfully" ; ELSE ; PRINT "Insufficient memory to save mouse state!" ; END IF cmp cs:MouseButtons,0 ;Has mouse been initialized? jz SaveStateExit ;If not, exit cmp cs:StateSegment,0 ;Do we already have a state saved? jz @F ;If not, continue call far ptr MouseRestoreState ;If we do, release it. @@: mov ax,15h ;Function 15h - Mouse save buffer size int 33h ;Call mouse driver add bx,32 ;Add two paragraphs (because of SETMEM) mov cs:SaveBytes,bx ;Save for later neg bx ;Make negative (SETMEM releases mem) mov dx,-1 ;Extend the negative sign into MSW push dx ;Push long int on stack push bx call B$SetM ;Do the SETMEM mov bx,cs:SaveBytes ;Restore number of bytes mov cl,4 ;Divide by 16 (Dos wants paragraphs) shr bx,cl ;Much faster than DIViding mov ax,4800h ;Dos allocate memory function int 21h ;Call DOS jc AllocError ;Whoops - not enough memory mov cs:StateSegment,ax ;Store it here xor dx,dx ;Offset of buffer area mov es,ax ;Segment of buffer goes here mov ax,16h ;Function 16h - Save mouse state int 33h ;Call mouse driver mov ax,-1 ;If declared as function, return TRUE SaveStateExit: ret ;Back to BASIC AllocError: xor ax,ax ;Zero ax so a FALSE result will be jmp short SaveStateExit ; returned if declared as function. MouseSaveState endp ;----------------------------------------------------------------------------- MouseRestoreState proc ; Restores the state of the mouse if previously saved with the ; MouseSaveState routine. See the MouseSaveState routine for additonal ; usage notes. ;From BASIC: ; ; DECLARE SUB MouseRestoreState () 'Optional ; CALL MouseRestoreState 'Or, if declare is present, ; MouseRestoreState cmp cs:MouseButtons,0 ;Has the mouse been initialized? jz @F ;If not, exit cmp cs:StateSegment,0 ;Has a state been saved? jz @F ;If not, exit mov ax,2 ;The restore function doesn't turn off int 33h ;current cursor, so we'll do it. mov es,cs:StateSegment ;Segment of buffer into es xor dx,dx ;Offset of buffer is zero. mov ax,17h ;Function 17h - Restore mouse state int 33h ;Call mouse driver mov ax,4900h ;Dos function 49h - Free memory block int 21h ;Call Dos mov ax,cs:SaveBytes ;Number of bytes BASIC gave to us xor dx,dx ;Zero dx push dx ;Push long int onto stack for SETMEM push ax call B$SetM ;Give the buffer space back to BASIC mov cs:StateSegment,0 ;Zero our variable @@: ret ;Back to BASIC MouseRestoreState endp ;----------------------------------------------------------------------------- MouseGetSensitivity proc uses si, VertRatio:Word, HorizRatio:Word, DblSpd:Word ; Returns the current mouse "sensitivity" related settings. See the ; routines MouseSetRatio and MouseSetDblSpd for more information ;From BASIC: ; ; DECLARE SUB MouseGetSensitivity (VertRatio%, HorizRatio%, DblSpd%) ; CALL MouseGetSensitivity (VertRatio%, HorizRatio%, DblSpd%) xor bx,bx ;Zero these registers. If mouse not mov cx,bx ; initialized, all parameters will be mov dx,bx ; returned with zero values. cmp cs:MouseButtons,0 ;Has mouse been initialized? jz @F ;If not, exit mov ax,1bh ;Function 1Bh - Get mouse sensitivity int 33h ;Call mouse driver @@: mov si,[VertRatio] mov [si],cx ;Move data in cx to VertRatio% mov si,[HorizRatio] mov [si],bx ;Data in bx to HorizRatio% mov si,[DblSpd] mov [si],dx ;Double-speed ratio into DblSpd% ret MouseGetSensitivity endp ;----------------------------------------------------------------------------- MouseGetPage proc ; Returns the display page the mouse pointer is currently visible on. See ; MouseSetPage to change the pointer's current display page. Returns -1 ; if the mouse has not yet been initialized. ;From BASIC: ; ; DECLARE FUNCTION MouseGetPage% () ; ; PRINT "The current pointer display page is"; MouseGetPage% mov bx, -1 ;Assume NOT initialized cmp cs:MouseButtons,0 ;Has the mouse been initialized? jz @F ;If not, exit mov ax,1eh ;Function 1Eh - Get pointer page int 33h ;Call the mouse driver @@: mov ax,bx ;Put result in ax for return ret ;Back to BASIC. MouseGetPage endp ;----------------------------------------------------------------------------- MouseSetPage proc, PointerPage:Word ; Sets the current mouse pointer display page. Be sure that your current ; video mode supports the specified page number. See BASIC's SCREEN ; statement documention for more info. ;From BASIC: ; ; DECLARE SUB MouseSetPage(PointerPage%) 'Optional ; CALL MouseSetPage(1) 'Or, if the declare is present, ; MouseSetPage 1 cmp cs:MouseButtons,0 ;Has the mouse been initialized? jz @F ;If not, exit mov bx,[PointerPage] mov bx,[bx] ;Put Page% into bx mov ax,1dh ;Function 1Dh - Select pointer page int 33h ;Call mouse driver @@: ret ;Back to BASIC MouseSetPage endp ;----------------------------------------------------------------------------- MouseGetInfo proc uses si, MajorV:word, MinorV:Word, MouseType:Word, Irq:Word ; Returns information about the current mouse hardware and software: ; MajorVer% - The Major mouse driver version (7 for 7.04). It is returned ; as zero if the mouse has not been initialized. ; MinorVer% - The Minor mouse driver version (4 for 7.04) ; MouseType% - 1 = bus mouse, 2 = serial mouse, 3 = InPort mouse, ; 4 = PS/2 mouse, 5 = HP mouse ; Irq% - The hardware Irq line that the mouse driver is using. 0 = PS/2, ; or 2, 3, 4, 5, or 7 for all others. ;From BASIC: ; ; DECLARE SUB MouseGetInfo(MajorV%, MinorV%, MouseType%, Irq%) ; CALL MouseGetInfo(MajorV%, MinorV%, MouseType%, Irq%) xor bx,bx ;Zero registers so results will be mov cx,bx ;returned as zero if not initialized. cmp cs:MouseButtons,0 ;Has the mouse been initialized? jz @F ;If not, exit mov ax,24h ;Function 24h - Get mouse information int 33h ;Call mouse driver @@: xor ah,ah ;Make sure ah = 0 mov al,bh ;Major version into al mov si,[MajorV] mov [si],ax ;Ax into MajorV% mov al,bl ;Minor version into al mov si,[MinorV] mov [si],ax ;Ax into MinorV% mov al,ch ;Mouse type into al mov si,[MouseType] mov [si],ax ;Ax into MouseType% mov al,cl ;Irq into al mov si,[Irq] mov [si],ax ;Ax into Irq% ret MouseGetInfo endp ;----------------------------------------------------------------------------- MouseSetEvent proc, EventMask:Word ; This routine sets up a "Mouse Event" handler which can be trapped in ; your BASIC program via "ON UEVENT". ; The following are the available events that can be trapped. Any ; combination of events are acceptable. Each event has a value ; associated with it. Define the desired event by assigning its ; value to the EventMask% parameter when calling this routine. Combinations ; of events can be obtained by adding the values of the respective events. ; for example, to set an event for "left button release" and "right ; button release", simply add the values together: 4 + 16 = 20. ; 1 = Any mouse movement ; 2 = Left button pressed ; 4 = Left button released ; 8 = Right button pressed ; 16 = Right button released ; 32 = Center button pressed ; 64 = Center button released ;From BASIC: ; ; DECLARE SUB MouseSetEvent (EventMask%) ; CALL MouseSetEvent(20) 'Traps left or right button release ; ; ON UEVENT GOSUB MouseEvent ; UEVENT ON ; ; DO 'Continue processing event until ; A$ = INKEY$ ' a key is pressed. ; LOOP UNTIL LEN(A$) ; END ; ;MouseEvent: ; CALL MouseGetEventInfo(Event%, Lb%, Rb%, Cb%, Row%, Column%) ; PRINT "Mouse event occurred: - "; ; IF Event% AND 4 THEN ; PRINT "Left Button was released." ; END IF ; IF Event% AND 16 THEN ; PRINT "Right Button was released." ; END IF ; PRINT "Mouse location:"; Row%; ","; Column% ;RETURN cmp cs:MouseButtons,0 ;Has mouse been initialized? jz @F ;If not, exit Assume ds:Dgroup mov bx,[EventMask] ;Pointer to EventMask% into bx mov cx,[bx] ;EventMask% into cx jcxz @F ;Don't allow zero. Use MouseCancelEvent and cx,127 ; to disable handler. Strip unused bits call _SetEventHandler ;Turn on mouse event handler mov cs:UEventActive,-1 ;Set our flag indicating active event @@: ret ;Back to BASIC. MouseSetEvent endp ;----------------------------------------------------------------------------- MouseCancelEvent proc ; Cancels (disables) active mouse event handler. ; From BASIC: ; ; DECLARE SUB MouseCancelEvent () 'Optional ; CALL MouseCancelEvent 'Or if declare is present, ; MouseCancelEvent cmp cs:UEventActive,0 ;Is the event handler active? jz @F ;If not, exit xor cx,cx ;Zero cx (Disables handler) call _SetEventHandler ;Call the mouse driver mov cs:UEventActive,0 ;Zero our flag @@: ret ;Back to BASIC MouseCancelEvent endp ;----------------------------------------------------------------------------- MouseGetEventInfo proc, Event:Word, Lb:Word, Rb:Word, Cb:Word, Row%:Word, Column:Word ;Returns the values set during the last mouse event ;From BASIC: ; ; DECLARE SUB MouseGetEventInfo(Event%, Lb%, Rb%, Cb%, Row%, Column%) ; CALL MouseGetEventInfo(Event%, Lb%, Rb%, Cb%, Row%, Column%) ; Event% is bit-mapped and indicates what condition(s) triggered the ; mouse event. Just "AND" Event% with a value associated with one of ; your defined events. If the result is non-zero then that was what ; triggered the event. For example: ; ; PRINT "Event cause: "; ; IF Event% AND 4 THEN '4 is value for "left release" ; PRINT "Left button was released." ; ELSEIF Event% AND 16 THEN '16 is value for "right release" ; PRINT "Right button was released." ; END IF ; See MouseSetEvent for a complete listing of all available events and ; their respective values. ; The other parameters reflect the state of the mouse at the time of the ; last event. See MouseSetStatus for info on how to interpret their ; meanings. xor ax,ax ;Zero registers so zero results will mov bx,ax ; returned if the mouse has not been mov cx,ax ; initialized. mov dx,ax cmp cs:MouseButtons,0 ;Has the mouse been initialized? jz @F ;If not, exit mov bx,cs:ButtonState ;Load registers with current values mov cx,cs:HorizPos ; set by the last event. mov dx,cs:VertPos call _CommonFromPixels ;Convert to row/column, if needed @@: call _SetupReturn ;Load register contents into params mov ax,cs:EventCause ; for return to BASIC. Assume ds:Dgroup mov bx,[Event] ;Pointer to Event% into bx mov [bx],ax ;Event mask into Event% ret MouseGetEventInfo endp ;----------------------------------------------------------------------------- MouseExit proc ; This code should be called prior to program termination. It performs ; such tasks as releasing memory allocated by the mouse routines and ; unhooking the mouse routines from the mouse driver's "User Defined Event" ; handler. Failure to call this routine prior to program termination ; could result is a system lockup if the MouseSetEvent routine has been ; previously called and the MouseCancelEvent routine was not. ; During the call to the MouseReset routine, we attempted to add this ; this routine to BASIC's B_OnExit chain. This allows BASIC itself to call ; this code when your program terminates or restarts. In other words, ; you probably won't have to worry about it. It is a pretty rare occurance ; that the B_OnExit call would fail - more than 32 other procedures would ; have to be registered before it would fail. ; But for those faint of heart, we've gotcha covered. The function ; MouseOnExit% returns true if we are successfully included ; in the B_OnExit chain. If it returns false, the you need to call ; this routine (MouseExit) manually before your program terminates. For ; example: ; IF NOT MouseOnExit% THEN ; CALL MouseExit ; END IF ; END cmp cs:MouseButtons,0 ;Has mouse been initialized? jz @F ;If not, get out cmp cs:StateSegment,0 ;Has mouse state been saved and not jz CheckEventHandler ; restored? If not, continue. mov es,cs:StateSegment ;Put its segment into es mov ax,4900h ;Dos function 49h - Release memory int 21h ;Call Dos. mov cs:StateSegment,0 ;Zero the flag in case in the IDE xor ax,ax ;Set up for call to SETMEM. Give back push ax ; memory to BASIC. This is necessary push cs:SaveBytes ; in case we are in the environment call b$SetM ; where the memory isn't automatically ; reclaimed. CheckEventHandler: cmp cs:UEventActive,0 ;Is a mouse event sent? jz @F ;If not, exit xor cx,cx ;Cancel mouse event handler call _SetEventHandler mov cs:UEventActive,0 ;Clear our event flag mov cs:OnExitSet,0 ;Clear our OnExit flag. (We're ; supposedly terminating the program) @@: ret ;Back to whoever called us MouseExit endp ;----------------------------------------------------------------------------- ; The procedures listed below are called internally by the various mouse ; routines. Do not attempts to call these from BASIC. ;----------------------------------------------------------------------------- _CommonToPixels proc near ;Converts row/column coordinates to pixel based coordinates. cmp cs:PixelsOn,-1 ;Are we in the Pixels mode? jz @F ;If so, skip. call _GetCharSize ;Returns size of char in pixels xchg ax,dx ;Vertical location into ax dec ax ;Decrement by 1 for base 0 calculation xor dx,dx ;Zero dx for multiplication mul bx ;Multiply xchg ax,cx ;Horiz position into ax and result of dec ax ; last calculation into cx. xor dx,dx ;Zero dx again for another multiply mov bx,8 ;Multiply by 8 pixels wide mul bx xchg dx,cx ;Results of first calc back into dx xchg ax,cx ;Result of last calc into cx @@: ret _CommonToPixels endp ;----------------------------------------------------------------------------- _CommonFromPixels proc near uses es ;Internal routine that converts mouse pixel corrdinates into row/column ;coordinates. ;Enter with BX = button status ; CX = Horizontal (X) position in pixels ; DX = Vertical (Y) position in pixels ;Returns: AH = Left button status ; AL = Right Button Status ; BH = Center button status cmp cs:PixelsOn,-1 ;Is pixel mode on? jz @F ;If so, skip the row/col conversion push bx ;Save button status for now call _GetCharSize ;Interrogate system for char size xchg ax,dx ;Vertical position into ax xor dx,dx ;Zero dx for division div bx ;Divide by char height -> ax inc ax ;Add 1 push ax ;Save result for now mov bx,8 ;Character width into bx for divide xchg cx,ax ;Put horizontal position into ax xor dx,dx ;Zero dx again for division div bx ;Divide position by char width -> ax inc ax ;Add 1 xchg cx,ax ;Result back into cx pop dx ;Result of first calculation into dx pop bx ;Restore button status. @@: call _XlateButtonStatus ;Convert bx into Lb, Rb and Cb ret ;We're finished here. _CommonFromPixels endp ;----------------------------------------------------------------------------- _GetCharSize proc near ;Internal routine that returns the character height (in scan lines) ;in the BX register. push ds ;Save ds mov ax,40h Assume Ds:Nothing mov ds,ax ;Point ds to BIOS Data Area mov bl,byte ptr ds:[84h] ;Ega/Vga rows into bl cmp bl,0 ;If non-zero, we are on a EGA/MCGA/VGA jz CgaOrMono ;If zero, it's a CGA, mono, or Herc. mov bl,ds:[49h] ;Get current video mode cmp bl,3 ;If >3 we're in graphics mode jg GraphicsMode ;Jump to that code, if needed mov bx,8 ;If in text mode, char size is 8 jmp short HeightExit GraphicsMode: mov bx,ds:[85h] ;Get info right from BIOS data area. jmp short HeightExit ;We're finished. CgaOrMono: mov bx,8 ;Always 8 high HeightExit: pop ds ;Restore ds as to not freak anyone out ret ;Back to whatever procedure called us _GetCharSize endp ;----------------------------------------------------------------------------- _XlateButtonStatus proc near ;Converts BX into button status info. Returned in AH (LB), AL (RB), and ; BH (CB). xor ax,ax ;Zero ax and bh (assume all off) mov bh,ah test bl,1 ;Is left button pressed? jz CheckRight ;If not, check next button not ah ;If it is pressed, make ah = -1 CheckRight: test bl,2 ;Is the right button pressed? jz CheckCenter ;If not, check center button not al ;If it is pressed, make al = -1 CheckCenter: test bl,4 ;Is the center button pressed? jz ExitButtonStatus ;If not, exit. not bh ;If so, make bh=-1 ExitButtonStatus: ret _XlateButtonStatus endp ;----------------------------------------------------------------------------- _SetupReturn proc near ; Internal routine that takes register values, coverts them to words, ; and loads them into BASIC parameters for return. Assume ds:DGroup push ax ;Save two copies of ax push ax mov al,bh ;move bh into al (so we can use bx) cbw ;Convert al to a word (extends sign) mov bx,[bp+10] ;Pointer to Cb% into bx mov [bx],ax ;Center button status into Cb% pop ax cbw ;Convert al to word (Right button) mov bx,[bp+12] ;Pointer to Rb% into bx mov [bx],ax ;Right button status into Rb% pop ax mov al,ah ;Left button status into al cbw ;Convert it to a word mov bx,[bp+14] ;Pointer to Lb% into bx mov [bx],ax ;Left button status into Lb% mov bx,[bp+8] ;Pointer to Row% into bx mov [bx],dx ;Vertical position into Row% mov bx,[bp+6] ;Pointer to Column% into bx mov [bx],cx ;Horizontal position into Row% ret _SetupReturn endp ;----------------------------------------------------------------------------- _MouseEventHandler proc uses ds ; This routine is called by the mouse driver when the MouseSetEvent routine ; has been previously called. Each time, we call BASIC's SetUEvent routine, ; store the mouse button status and location for later retrieval - ; presumably during the BASIC program's "ON UEVENT" handler. ; On entry, the registers are configured as follows: ; ; AX - Mouse event flag(s). See MouseSetEvent for more info. ; BX - Current button status ; CX - Horizontal (X) mouse pointer location ; DX - Vertical (Y) mouse pointer location ; SI - Last raw vertical mickey count ; DI - Last raw horizontal mickey count ; DS - Mouse driver data segment mov cs:EventCause,ax ;Save event mask (cause of event) mov cs:ButtonState,bx ;Save button state mov cs:VertPos,dx ;Current vertical position mov cs:HorizPos,cx ;Current horizontal position push ss pop ds ;Point ds to DGROUP for call call SetUEvent ;Tell BASIC a "UEvent" occurred. ret ;Return to mouse driver _MouseEventHandler endp ;----------------------------------------------------------------------------- _SetEventHandler proc near ; Internal routine - Used to establish or cancel an active mouse ; event handler. ; Input: CX - Event Mask. 0 Cancels, 1-127 establishes mov ax,0ch ;Function 0Ch - Set mouse event handler push cs ;Point to the one we want to disable. pop es mov dx,offset _MouseEventHandler int 33h ;Call the mouse driver ret _SetEventHandler endp ;----------------------------------------------------------------------------- end ;End of assembly source file