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inputhandler.a
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1992-09-03
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*
* Copyright (c) 1992 Commodore-Amiga, Inc.
*
* This example is provided in electronic form by Commodore-Amiga, Inc. for
* use with the "Amiga ROM Kernel Reference Manual: Devices", 3rd Edition,
* published by Addison-Wesley (ISBN 0-201-56775-X).
*
* The "Amiga ROM Kernel Reference Manual: Devices" contains additional
* information on the correct usage of the techniques and operating system
* functions presented in these examples. The source and executable code
* of these examples may only be distributed in free electronic form, via
* bulletin board or as part of a fully non-commercial and freely
* redistributable diskette. Both the source and executable code (including
* comments) must be included, without modification, in any copy. This
* example may not be published in printed form or distributed with any
* commercial product. However, the programming techniques and support
* routines set forth in these examples may be used in the development
* of original executable software products for Commodore Amiga computers.
*
* All other rights reserved.
*
* This example is provided "as-is" and is subject to change; no
* warranties are made. All use is at your own risk. No liability or
* responsibility is assumed.
*
****************************************************************************
*
* InputHandler.a
*
* InputHandler that does a Left/Right mouse button swap...
*
*
* See Swap_Buttons.c for details on how to compile/assemble/link...
*
************************************************************************
*
* Required includes...
*
* CSECT InputHandler ;SAS/Lattice ASM command requires this
*
INCDIR "include:" ;HX68 requires this
INCLUDE "exec/types.i"
INCLUDE "exec/io.i"
INCLUDE "devices/inputevent.i"
*
************************************************************************
*
* Make the entry point external...
*
xdef _ButtonSwap
*
************************************************************************
*
* This is the input handler that will swap the
* mouse buttons for left handed use.
*
* The event list gets passed to you in a0.
* The is_Data field is passed to you in a1.
* This example does not use the is_Data field...
*
* On exit you must return the event list in d0. In this way
* you could add or remove items from the event list.
*
************************************************************************
*
* The handler gets called here...
*
_ButtonSwap: move.l a0,-(sp) ; Save the event list
*
* Since the event list could be a linked list, we start a loop
* here to handle all of the events passed to us.
*
CheckLoop: move.w ie_Qualifier(a0),d1 ; Get qualifiers...
move.w d1,d0 ; Two places...
*
* Since we are changing left and right mouse buttons, we need to make
* sure that we change the qualifiers on all of the messages. The
* left and right mouse buttons are tracked in the message qualifiers
* for use in such things as dragging. To make sure that we continue
* to drag correctly, we change the qualifiers.
*
CheckRight: btst #IEQUALIFIERB_RBUTTON,d1 ; Check for right
beq.s NoRight
bset #IEQUALIFIERB_LEFTBUTTON,d0 ; Set the left...
beq.s CheckLeft
NoRight: bclr #IEQUALIFIERB_LEFTBUTTON,d0 ; Clear the left...
*
CheckLeft: btst #IEQUALIFIERB_LEFTBUTTON,d1 ; Check for left
beq.s NoLeft
bset #IEQUALIFIERB_RBUTTON,d0 ; Set the right...
beq.s SaveQual
NoLeft: bclr #IEQUALIFIERB_RBUTTON,d0 ; Clear the right...
*
SaveQual: move.w d0,ie_Qualifier(a0) ; Save back...
*
* The actual button up/down events are transmitted as the
* code field in RAWMOUSE events. The code field must the be
* checked and modified when needed on RAWMOUSE events. If the
* event is not a RAWMOUSE, we are done with it.
*
cmp.b #IECLASS_RAWMOUSE,ie_Class(a0) ; Check for mouse
bne.s NextEvent ; If not, next...
*
move.w ie_Code(a0),d0 ; Get code...
move.w d0,d1 ; Save...
and.w #$7F,d0 ; Mask UP_PREFIX
cmp.w #IECODE_LBUTTON,d0 ; Check for Left...
beq.s SwapThem ; If so, swap...
cmp.w #IECODE_RBUTTON,d0 ; Check for Right...
bne.s NextEvent ; If not, next...
*
SwapThem: eor.w #1,d1 ; Flip bottom bit
move.w d1,ie_Code(a0) ; Save it...
*
* The event list is linked via a pointer to the next event
* in the first element of the structure. That is why it is not
* nessesary to use: move.l ie_NextEvent(a0),d0
*
* The reason I move to d0 first is that this also checks for zero.
* The last event in the list will have a NULL ie_NextEvent field.
* This is NOT as standard EXEC list where the node after the last
* node is NULL. Input events are single-linked for performance.
*
NextEvent: move.l (a0),d0 ; Get next event
move.l d0,a0 ; into a0...
bne.s CheckLoop ; Do some more.
*
* All done, just return the event list... (in d0)
*
move.l (sp)+,d0 ; Get event list back...
rts ; return from handler...
*
* ; SAS/Lattice ASM command requires this
* END