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95 lines
3.1 KiB
Plaintext
95 lines
3.1 KiB
Plaintext
;
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; File: WaitNextEvent.a
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;
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; Contains: This is the Classic Mac OS version of WaitNextEvent.
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; It is completely replaced in MultiFinder.
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;
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; Written by: Phil Goldman and Ed Tecot
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;
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; Copyright: © 1988-1990, 1992 by Apple Computer, Inc., all rights reserved.
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;
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; Change History (most recent first):
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;
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; <3> 2/11/92 JSM Moved this file to ToolboxEventMgr folder, keeping all the old
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; revisions.
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; <2> 1/4/90 dba get rid of assembly warning by renaming a local
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; <1.0> 11/16/88 CCH Added to EASE.
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; <S426> 3/16/88 PYG Handle overflow for timeout and control of mouse-moved diarrhea
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; <S380> 2/4/88 EMT Fix WaitNextEvent when mouseRgn is nil
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;
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WaitNextEvent PROC EXPORT
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mouseMovedMsg EQU $FA000000
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maxTickCount EQU $FFFFFFFF
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; Stack Frame
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retAddr EQU 4
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mouseRgn EQU retAddr+4
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timeOutX EQU mouseRgn+4
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theEvent EQU timeOutX+4
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eventMask EQU theEvent+4
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retBool EQU eventMask+2
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; Locals
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; d3: Tick time to wakeup (i.e. return)
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; d4: Last mouse position
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LINK A6, #0 ; Set up stack frame
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MOVEM.L D3-d4/A2, -(SP) ; Save registers <S436/22Mar88> PYG
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moveq.l #$FFFFFFFF,d4 ; pick a supposed invalid first value <S436/22Mar88> PYG
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; for the previous mouse position
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MOVE.L Ticks, D3 ; Save Ticks on entry
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ADD.L timeOutX(A6),D3 ; D3 is wakeup time
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bcc.s @WaitTimeOK ; if no (unsigned) overflow, branch <S426/16Mar88> PYG
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moveq.l #maxTickCount,d3 ; if overflow, peg to max tick count <S426/16Mar88> PYG
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@WaitTimeOK ; <S426/16Mar88> PYG
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MOVE.L theEvent(A6), A2 ; We'll use this often
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@WaitLoop
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_SystemTask
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SUBQ.W #2, SP ; Make space for return value
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MOVE.W eventMask(A6), -(SP)
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MOVE.L A2, -(SP) ; theEvent
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_GetNextEvent
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MOVE.B (SP)+, retBool(A6) ; Stuff the boolean return value
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BNE.S @WaitDone ; If non-zero, we're done
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; GetNextEvent correctly stuffs evtTicks, evtMouse, evtMeta, and evtMBut fields
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CMP.L evtTicks(A2), D3 ; Time to wake up?
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BLS.S @WaitDone ; If so, we're done
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MOVE.L mouseRgn(A6), D0 ; Get the mouseRgn <S380>
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BEQ.S @WaitLoop ; Loop if nil <S380>
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cmp.l evtMouse(A2),d4 ; is it the same as the last one? <S436/22Mar88> PYG
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beq.s @WaitLoop ; if so, loop <S426/16Mar88> PYG
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move.l evtMouse(A2),d4 ; and save new value <S436/22Mar88> PYG
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SUBQ.W #2, SP ; Make space
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MOVE.L evtMouse(A2), -(SP) ; pt for PtInRgn <S426/16Mar88> PYG
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MOVE.L D0, -(SP) ; rgn for PtInRgn <S380>
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_PtInRgn
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TST.B (SP)+ ; Is it in the region?
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BNE.S @WaitLoop ; If it is, loop around
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MOVE.W eventMask(A6), D0
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BTST #app4Evt, D0 ; Accept app4?
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BEQ.S @WaitDone ; No, get out
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; Manufacture a mouse moved event
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MOVE.W #app4Evt, evtNum(A2) ; what = app4Evt
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MOVE.L #mouseMovedMsg, evtMessage(A2) ; message = MouseMoved
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ST.B retBool(A6) ; return True
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@WaitDone
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MOVEM.L (SP)+, D3-d4/A2 ; Restore registers <S436/22Mar88> PYG
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UNLK A6
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MOVE.L (SP), A0 ; Get return address
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LEA retBool-4(SP), SP ; Pop the arguments
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JMP (A0) ; Return
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ENDPROC
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