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- /*
- * Swap_Buttons.c
- *
- * This example swaps the function of the left and right mouse buttons
- * The C code is just the wrapper that installs and removes the
- * input.device handler that does the work.
- *
- * The handler is written in assembly code since it is important that
- * handlers be as fast as possible while processing the input events.
- *
- * Compile and link as follows:
- *
- * SAS C 5.10:
- * LC -b1 -cfirst -v -w Swap_Buttons.c
- *
- * Adapt assemble:
- * HX68 InputHandler.a to InputHandler.o
- *
- * BLink:
- * BLink from LIB:c.o+Swap_Buttons.o+InputHandler.o LIB LIB:lc.lib
- * LIB:amiga.lib TO Swap_Buttons
- *
- */
-
- #include <exec/types.h>
- #include <exec/memory.h>
- #include <exec/interrupts.h>
- #include <devices/input.h>
- #include <intuition/intuition.h>
-
- #include <clib/exec_protos.h>
- #include <clib/alib_protos.h>
- #include <clib/intuition_protos.h>
-
- #include <stdio.h>
-
- #ifdef LATTICE
- int CXBRK(void) { return(0); } /* Disable SAS CTRL/C handling */
- int chkabort(void) { return(0); } /* really */
- #endif
-
- UBYTE NameString[]="Swap Buttons";
-
- struct NewWindow mywin={50,40,124,18,0,1,CLOSEWINDOW,
- WINDOWDRAG|WINDOWCLOSE|SIMPLE_REFRESH|NOCAREREFRESH,
- NULL,NULL,NameString,NULL,NULL,0,0,0,0,WBENCHSCREEN};
-
- extern VOID ButtonSwap();
-
- extern struct IntuitionBase *IntuitionBase;
-
- /*
- * This routine opens a window and waits for the one event that
- * can happen (CLOSEWINDOW) This is just to let the user play with
- * the swapped buttons and then close the program...
- */
- VOID WaitForUser(VOID)
- {
- struct Window *win;
-
- if (IntuitionBase=(struct IntuitionBase *)
- OpenLibrary("intuition.library",33L))
- {
- if (win=OpenWindow(&mywin))
- {
- WaitPort(win->UserPort);
- ReplyMsg(GetMsg(win->UserPort));
-
- CloseWindow(win);
- }
- CloseLibrary((struct Library *)IntuitionBase);
- }
- }
-
- VOID main(VOID)
- {
- struct IOStdReq *inputReqBlk;
- struct MsgPort *inputPort;
- struct Interrupt *inputHandler;
-
- if (inputPort=CreatePort(NULL,NULL))
- {
- if (inputHandler=AllocMem(sizeof(struct Interrupt),
- MEMF_PUBLIC|MEMF_CLEAR))
- {
- if (inputReqBlk=(struct IOStdReq *)CreateExtIO(inputPort,
- sizeof(struct IOStdReq)))
- {
- if (!OpenDevice("input.device",NULL,
- (struct IORequest *)inputReqBlk,NULL))
- {
- inputHandler->is_Code=ButtonSwap;
- inputHandler->is_Data=NULL;
- inputHandler->is_Node.ln_Pri=100;
- inputHandler->is_Node.ln_Name=NameString;
- inputReqBlk->io_Data=(APTR)inputHandler;
- inputReqBlk->io_Command=IND_ADDHANDLER;
- DoIO((struct IORequest *)inputReqBlk);
-
- WaitForUser();
-
- inputReqBlk->io_Data=(APTR)inputHandler;
- inputReqBlk->io_Command=IND_REMHANDLER;
- DoIO((struct IORequest *)inputReqBlk);
-
- CloseDevice((struct IORequest *)inputReqBlk);
- }
- else
- printf("Error: Could not open input.device\n");
-
- DeleteExtIO((struct IORequest *)inputReqBlk);
- }
- else
- printf("Error: Could not create I/O request\n");
-
- FreeMem(inputHandler,sizeof(struct Interrupt));
- }
- else
- printf("Error: Could not allocate interrupt struct memory\n");
-
- DeletePort(inputPort);
- }
- else
- printf("Error: Could not create message port\n");
- }
-
- ************************************************************************
- * 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...
- *
- INCDIR "include:"
- 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...
-
-