Developer CD Series 1990: Night of the Living Disc

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Apple IIgs Source Code | 1990-05-25 | 42.0 KB | 1,232 lines | [B0] Apple IIgs Source Code (0x0003)

******************************************************************************* * * BoxCtl CDEFProc -- Version 3.0 * * (C) Copyright Apple Computer, Inc. 1988-1990 * All rights reserved. * * Developer Technical Support Apple II Sample Code * * by Keith Rollin * ******************************************************************************* * myDragCtl start * * Description: Drag command. We hit something. Determine what it was and * drag it around the screen. If we hit the frame, then drag * the whole control. If we hit a knob, then we grow the * control (just like growing a window). * * * Inputs: NONE * * Outputs: NONE * * External Refs: * Import SetMyPen * Import Snap2Grid * Import myDrawCtl * Import FindPart * Import SetCtlRect * * Entry Points: NONE * ******************************************************************************* using CtlData PushLong #oldPenState ; save drawing state, as we change it _GetPenState ldy #6 ; make a working copy of CtlRect. loop100 lda myCtlRect,y sta drag_rect,y dey dey bpl loop100 pha ; has the mouse been lifted up? PushWord #mUpMask ; ask for any such events PushLong #TrackEvent _GetNextEvent pla lda TrackEvent+owhat cmp #mouseUpEvt ; was there a mouse up event? bne mDown ; no - so start tracking brl done ; yes - so leave mDown ANOP PushLong #TrackEvent+owhere _GlobalToLocal lda TrackEvent+owhere sta OldMouse ; FindPart likes the mouse Position sta theParam ; in 'theParam' lda TrackEvent+owhere+2 sta OldMouse+2 sta theParam+2 jsr FindPart ; what did we hit? (returns internal sta dragPart ; partcode number). cmp #InteriorPart+1 ; what part did we hit? bge GrowFrame ; some knob - grow the control brl DragFrame ; interior or frame - move the control ; ; This part of the program is called when we detect that we have clicked on ; a grow knob. It tracks the motions of the mouse, and grows/draws the ; control appropriately. ; GrowFrame ANOP PushWord #2 ; set us to XOR mode. This is for the _SetPenMode ; rubber-banding effect of growing. jsr SetMyPen ; set my pen's width PushLong #GreyPattern ; grow with a grey pattern _SetPenPat ldy #oCtlMaxX ; get local copies of the maximum ldx #6 ; and minimum dimensions. loop0010 lda [<CtlPtr],y sta MinY,x dey dey dex dex bpl loop0010 ; validate the min and max values. the min values must be at least $10. ; if not, they are set there. the max values must be at least as large ; as the min values. if not, they are set to $FFFF lda #$10 cmp MinX blt ckMinY sta MinX ckMinY cmp MinY blt ckMaxX sta MinY ckMaxX lda MaxX cmp MinX bge ckMaxY ChgX lda #$FFFF sta MaxX ckMaxY lda MaxY cmp MinY bge doneCk ChgY lda #$FFFF sta MaxY doneCk ANOP ; ; We grow the control with the following algorithm. First, setup by: ; ; 1. saving the current mouse postion in 'NewMouse', ; 2. aligning 'NewMouse' to the grid, and ; 3. making a working copy of the control's rectangle in 'drag_rect'. ; ; We then enter the main loop: ; ; 4. Draw a copy of the rubber-banding rectangle. ; 5. Check the mouse button. If it is up, goto #12 ; 6. Put the position of the mouse into 'NewerMouse'. Align it to grid. ; 7. Check it against 'NewMouse'. If it hasn't changed, goto #5. ; 8. Erase the old rubber-Band. ; 9. Calculate the new rectangle and put it into 'drag_rect' ; 10. Move 'NewerMouse' into 'NewMouse' ; 11. Goto #4 ; ; The growing is all done. Clean up and leave. ; ; 12. Erase the rubber band. ; 13. Erase the control. ; 14. Invalidate the area under the control ; 15. Make drag_rect the new boundary of the control ; 16. Say goodnite, Gracie. ; lda OldMouse sta NewMouse lda OldMouse+2 sta NewMouse+2 ldx #^NewMouse ; make sure we are on the grid!!! lda #NewMouse jsr Snap2Grid DrawLoop ANOP PushLong #drag_rect ; draw the rubber-band _FrameRect WaitLoop ANOP pha ; has the mouse been lifted up? PushWord #mUpMask ; ask for any such events PushLong #TrackEvent _GetNextEvent pla lda TrackEvent+owhat cmp #mouseUpEvt beq done ; mouse up occured - so leave. lda TrackEvent+owhere ; mouse still down. copy it to sta NewerMouse ; NewerMouse lda TrackEvent+owhere+2 sta NewerMouse+2 PushLong #NewerMouse ; convert it to window coordinates. _GlobalToLocal ldx #^NewerMouse ; make sure the new position is on lda #NewerMouse ; the grid. jsr Snap2Grid lda NewerMouse ; See if the mouse position moved. We cmp NewMouse ; only redraw the rubber-band if it did. bne ReDraw ; It did - redraw the rubber-band lda NewerMouse+2 cmp NewMouse+2 beq WaitLoop ; No movement - check button state ReDraw ANOP PushLong #drag_rect ; erase the old rubber band _FrameRect lda NewerMouse ; copy NewerMouse for next loop sta NewMouse sec ; and update deltaXY for AdjFrameRect sbc OldMouse sta deltaY lda NewerMouse+2 sta NewMouse+2 sec sbc OldMouse+2 sta deltaX jsr AdjFrameRect ; adjust for drawing the new rect brl DrawLoop ; redraw the rubber-band done ANOP PushLong #drag_rect ; erase the rubber band _FrameRect PushLong #myCtlRect ; erase the control _EraseRect PushLong #myCtlRect ; invalidate the stuff under it _InvalRect brl Exit ; ; This part of the program is called when we have clicked on either the ; frame or the interior. It calls dragrect to move an outline of the ; control around. ; DragFrame ANOP ; Get the portRect of the window that owns this control. This rectangle ; will be used to control the limits of dragging. ldy #octlOwner ; get the pointer to the control's lda [<CtlPtr],y ; owning window into 'work' sta <work iny iny lda [<CtlPtr],y sta <work+2 ldy #oportRect+6 ; copy the PortRect of the window ldx #6 ; out of its GrafPort into limitRect. loop400 lda [<work],y sta limitRect,x dey dey dex dex bpl loop400 ; ; Use dragRect to drag an outline of the control around the ; screen for me. ; pha ; space for result pha PushLong #DragDraw ; no action proc PushLong #GreyPattern ; drag pattern PushLong OldMouse ; starting location of mouse PushLong #drag_rect ; outline to drag PushLong #limitRect ; limitRect PushLong #limitRect ; slopRect PushWord #%00101000 ; custom drag flag, ReturnRect flag _DragRect pla ; pull off and discard the deltas pla PushLong #myCtlRect ; erase the control in its old pos'n _EraseRect PushLong #myCtlRect ; invalidate the stuff under it _InvalRect ldx #^drag_rect ; align the new rectangle to the grid. lda #drag_rect jsr Snap2Grid Exit ANOP ldy #6 ; copy over the new control frame loop200 lda drag_rect,y sta myCtlRect,y dey dey bpl loop200 PushLong #myCtlRect ; Invalidate the new area under the _InvalRect ; control so it will be redrawn. PushLong #oldPenState _SetPenState ; clean up QuickDraw after ourselves. jsr SetCtlRect ; copy new rect into control record lda #-1 ; Say that we handled it tax rts ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; ; ; Called by DragRect to draw the rectangle of the control. I draw the outline ; myself so that I can align it to my own grid. The normal aligning of the ; rectangle to the grid only aligns to powers of 2. I align to anything. ; ; When this routine is called, the stack looks like this: ; ; PUSH:WORD - delta X ; PUSH:WORD - delta Y ; PUSH:BYTE[3] - return address ; ; However, since I set the ReturnRect flag, I can ignore the deltas passed to ; me, and use drag_rect directly. I make a copy of it, make sure that it is ; aligned to the grid, draw it, remove the parameters, and return to the ; control manager. ; DragDraw ANOP RTLAddr equ 1 DY equ RTLAddr+3 DX equ DY+2 ldx #6 ; make a copy of the rectangle that loop500 lda drag_rect,x ; _DragRect is passing to us. We are sta draw_rect,x ; going to modify it so that it is dex ; aligned to the grid. dex bpl loop500 ldx #^draw_rect ; align the new rectangle to the grid. lda #draw_rect jsr Snap2Grid DrawOutline ANOP PushLong #draw_rect _FrameRect ExitDragDraw ANOP lda 1,s ; move the RTL address back up sta 5,s lda 2,s sta 6,s pla ; remove the parameters (DX, DY) pla rtl ; back to dragRect!! ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; ; ; Called by the routine that grows the control with a rubber-band ; sort of thing. It uses the part code we hit as an index into ; a table. This table contains a list of offsets into the ; 4 words of drag_rect. It reads in a pair of these offsets and ; uses them to modify the appropriate X/Y coordinates with ; deltaY and deltaX. DeltaY and deltaX are set up by the ; rubber-banding routine. AdjFrameRect ANOP ldx #6 loop380 lda drag_rect,x sta new_rect,x dex dex bpl loop380 lda dragPart ; get the part code we are dragging sec sbc #ULPart asl a ; turn it into an index. asl a tax lda PtToAdj,x ; get Y coordinate to adjust tay lda PtToAdj+2,x ; get X coordinate to adjust tax ; if the entry that was fetched from the table was -1, then that means ; that we are making no adjustments in that direction. For instance, it ; we are dragging on the top edge knob, we want to adjust just the top ; side of the rectangle, but want to leave either of the sides alone. cpy #-1 ; modify the vertical coordinate beq NoChg1 ; of choice if necessary. clc lda deltaY adc myCtlRect,y sta new_rect,y NoChg1 cpx #-1 ; modify the horizontal coordinate beq NoChg2 ; of choice if necessary. clc lda deltaX adc myCtlRect,x sta new_rect,x NoChg2 ANOP ldx #^new_rect ; align the rectangle to the grid. lda #new_rect jsr Snap2Grid ; now that we have a new rectangle, we have to make sure that it is within ; the maximum and minimum sizes allowed. sec ; make sure the new Y size is OK lda new_rect+4 sbc new_rect bcc NoCopy1 cmp MinY blt NoCopy1 ; it's not, so leave old coords there inc a cmp MaxY bge NoCopy1 ; it's not, so leave old coords there lda new_rect ; it is, so update it. sta drag_rect lda new_rect+4 sta drag_rect+4 NoCopy1 ANOP sec ; make sure the new X size is OK lda new_rect+6 sbc new_rect+2 bcc NoCopy2 cmp MinX blt NoCopy2 ; it's not, so leave old coords there inc a cmp MaxX bge NoCopy2 ; it's not, so leave old coords there lda new_rect+2 ; it is, so update it sta drag_rect+2 lda new_rect+6 sta drag_rect+6 NoCopy2 ANOP rts PtToAdj dc i2'0,2,0,-1,0,6,-1,6,4,6,4,-1,4,2,-1,2' TrackEvent ds $10 OldMouse ds 4 NewMouse ds 8 NewerMouse ds 8 drag_rect ds 8 draw_rect ds 8 new_rect ds 8 limitRect ds 8 MinY ds 2 MinX ds 2 MaxY ds 2 MaxX ds 2 end EJECT ******************************************************************************* * myNewValue start * * Description: Called when the value of the control is to be changed. * The area under the control is invalidated so that it will * be redrawn. * * * Inputs: NONE * * Outputs: NONE * * External Refs: * Import Snap2Grid * Import myDrawCtl * Import SetCtlRect * * Entry Points: NONE * ******************************************************************************* using CtlData PushLong #myCtlRect ; erase old control _EraseRect PushLong #myCtlRect ; invalidate area erased _InvalRect ldx #^myCtlRect ; make sure control is on the grid lda #myCtlRect jsr Snap2Grid jsr SetCtlRect lda #0 ; return no value tax rts end EJECT ******************************************************************************* * mySetParams start * * Description: Set new parameters command. Don't set if either of them * are negative. * * * Inputs: NONE * * Outputs: NONE * * External Refs: NONE * * Entry Points: NONE * ******************************************************************************* using CtlData lda theParam ; these have gotta go on in reverse sta <work+2 lda theParam+2 sta <work ora <work+2 ; is this a NULL pointer? bne CopyIt ; no - so use it lda #^StdCtlData ; yes - so set pointer to default data sta <work+2 lda #StdCtlData sta <work CopyIt ANOP ldy #oCtlSize-2 ; copy the data into control record. ldx #oCtlSize-oCtlMinY-2 loop phy txy lda [<work],y ply sta [<CtlPtr],y dey dey dex dex bpl loop lda #0 ; return no value tax rts end EJECT ******************************************************************************* * myRecSize start * * Description: Return record size command. * * * Inputs: NONE * * Outputs: A = Size of the control record to allocate. * * External Refs: NONE * * Entry Points: NONE * ******************************************************************************* using CtlData lda #oCtlSize ; low word of record size ldx #0 ; high word rts end EJECT ******************************************************************************* * Null start * * Description: Null routine. Does nothing. Returns no error. * * * Inputs: NONE * * Outputs: NONE * * External Refs: NONE * * Entry Points: NONE * ******************************************************************************* lda #0 tax rts end EJECT ******************************************************************************* * InitCtlData start * * Description: Initialize some data that will needs to be handy: Get a * pointer to the control record (we are supplied only with * a handle), make a local copy of the control rectangle, set * up a pointer to a color table, and move CtlParam from a * Direct Page location into an absolute location. * * * Inputs: NONE * * Outputs: NONE * * External Refs: NONE * * Entry Points: NONE * ******************************************************************************* using CtlData ; ; Check to see if the Control Manager is sending us a 'RecSize' call. If it ; is, then we cannot rely on the validity of the Control handle, as it has not ; yet been allocated and is essentially garbage. Since we do not know what it ; points to, we don't want to read from it, as it may actually accidentally ; point to something dangerous, like the IWM I/O locations!!! So if we detect ; a RecSize code, skip over this routine. ; lda <CtlCode ; is this a RecSize call? cmp #recSize beq done ; yes - skip this whole routine ; ; Copy the value in CtlParam into a local location -- off of the direct page. ; We do this for convenience. We may need to pass a pointer to CtlParam to ; a toolbox routine, but you can't do that for a direct page location. The ; number assiciated with a direct page location is really an offset off of the ; base specified by the Direct Page register; it is NOT an absolute memory ; location. So that we can conveniently use 'PushLong #location' if we need ; to, I copy CtlParam to a non-direct page location. ; lda <CtlParam sta theParam lda <CtlParam+2 sta theParam+2 ldy #2 ; get a handy pointer to the CtlRec lda [<theCtlHandle],y sta <CtlPtr+2 lda [<theCtlHandle] sta <CtlPtr ldy #octlRect+6 ; copy the control rect over to the ldx #6 ; local variable. loop lda [<CtlPtr],y sta myCtlRect,x dey dey dex dex bpl loop ; ; The following values are used by Snap2Grid. However, Snap2Grid can be ; called with an invalid Direct Page, so we copy them out the control ; record (which is pointed to by a pointer in our Direct Page) and into ; some absolute locations that we can get to at all times. ; ldy #oCtlGridX ; get the X and Y spacings out of the lda [<CtlPtr],y ; control record and into some local sta myCtlGridX ; storage for easy handling. ldy #oCtlGridY lda [<CtlPtr],y sta myCtlGridY ; Check the color table pointer. If it is non-zero, install it as the ; pointer to the color table we'll be using. If not, then install a ; pointer to a default color table. ldy #octlColor ; Get the pointer to the color lda [<CtlPtr],y ; table in the control record. sta ColorPtr ; Save it to a local pointer. iny iny lda [<CtlPtr],y sta ColorPtr+2 ora ColorPtr ; is it a NULL pointer? bne done ; no, so use it. lda #StdColorTable ; yes, install my own color table. sta ColorPtr lda #^StdColorTable sta ColorPtr+2 done ANOP rts end EJECT ******************************************************************************* * SetCtlRect start * * Description: This routine is called when the control's bounding * rectangle has been changed and needs to be written back * out to the control record. * * * Inputs: NONE * * Outputs: NONE * * External Refs: NONE * * Entry Points: NONE * ******************************************************************************* using CtlData ldy #octlRect+6 ; get an offset into the control rec. ldx #6 ; index to my local record. loop ANOP lda myCtlRect,x sta [<CtlPtr],y dey dey dex dex bpl loop rts end EJECT ******************************************************************************* * SetMyPen start * * Description: We want our control to look good in both 320 and 640 mode. * Because vertical lines are thinner in 640 than 320, its a * good idea to draw them doubly thick just so they can be * seen. This routine will determine what mode we are in and * adjust the pen accordingly. * * * Inputs: NONE * * Outputs: NONE * * External Refs: NONE * * Entry Points: NONE * ******************************************************************************* using CtlData pha ; we base pen width on the MasterSCB _GetMasterSCB pla and #$0080 ; check the mode bit beq pen320 ; we are in 320 mode - go push a 1 PushWord #2 ; in 640 mode - push on a 2 width bra setpn pen320 PushWord #1 ; in 320 mode - push on a 1 width setpn ANOP ; width is 1 or 2 PushWord #1 ; Height is always 1 _SetPenSize rts end EJECT ******************************************************************************* * CalcCorners start * * Description: This routine calculates the rectangles for all of the * little knobs that are used to grow the control. They are * stored locally - not with the control record - and so need * to be calculated every time we need to check for hits or * to draw the control. * * * Inputs: NONE * * Outputs: knobXXX, FrameHeight, FrameWidth variables are initialized. * * External Refs: NONE * * Entry Points: NONE * ******************************************************************************* using CtlData top equ 0 ; alias these to something a little left equ 2 ; more descriptive. bottom equ 4 right equ 6 ; Get the size of the knobs. The height and width are stored in the CtlValue ; field in a packed format. This unpacks them and stores them locally for ; ease of access. ldy #octlValue lda [<CtlPtr],y and #$00FF sta FrameHeight lda [<CtlPtr],y xba and #$00FF sta FrameWidth ; ; We "assembly line" the initialization of the knob rectangles. Instead ; of calculating just one knob at a time, we do a few of them all at the ; same time. Here we initialize the tops and bottoms of the 3 top knobs. lda myCtlRect+top sta knobUL+top sta knobTop+top sta knobUR+top clc adc FrameHeight sta knobUL+bottom sta knobTop+bottom sta knobUR+bottom ; ; Initialize the lefts and rights of the three left knobs. ; lda myCtlRect+left sta knobUL+left sta knobLeft+left sta knobLL+left clc adc FrameWidth sta knobUL+right sta knobLeft+right sta knobLL+right ; ; Initialize the tops and bottoms of the three bottom knobs. ; lda myCtlRect+bottom sta knobLL+bottom sta knobBottom+bottom sta knobLR+bottom sec sbc FrameHeight sta knobLL+top sta knobBottom+top sta knobLR+top ; ; Initialize the lefts and rights of the three right knobs. ; lda myCtlRect+right sta knobUR+right sta knobRight+right sta knobLR+right sec sbc FrameWidth sta knobUR+left sta knobRight+left sta knobLR+left ; ; At this point, the 4 corner knobs have been completely initialized. ; If we are going to be using the edge knobs, then we'll have to do ; some extra math. However, if we aren't, then we'll skip over the ; math. ldy #octlFlag lda [<CtlPtr],y and #knobEdgeMask beq done ; Do extra setup for edge knobs ; ; First, get top and bottom coordinates for the side edges: ; ; top = (myCtlRect.top + myCtlRect.bottom - FrameHeight)/2 ; bot = (myCtlRect.top + myCtlRect.bottom + FrameHeight)/2 clc lda myCtlRect+top adc myCtlRect+bottom pha adc FrameHeight lsr a sta knobLeft+bottom sta knobRight+bottom pla sec sbc FrameHeight lsr a sta knobLeft+top sta knobRight+top ; ; Now perform similar calculations for the left and right sides ; of the top and bottom edge knobs. ; clc lda myCtlRect+left adc myCtlRect+right pha adc FrameWidth lsr a sta knobTop+right sta knobBottom+right pla sec sbc FrameWidth lsr a sta knobTop+left sta knobBottom+left done ANOP rts end EJECT ******************************************************************************* * Snap2Grid start * * Description: This control defproc lets the application optionally create * an invisible grid based on local coordinates. When this is * done, the 4 corners of the control are always aligned to * the coordinates of this grid. This occurs when we drag or * resize the control, or call MoveControl. Snap2Grip is the * routine that ensures we are on the grid. * * * Inputs: A = low word of pointer to rectangle to fix * X = high word * * Outputs: rectangle is modified in place. * * External Refs: NONE * * Entry Points: NONE * ******************************************************************************* using CtlData oldD equ 1 oldB equ oldD+2 rectPtr equ oldB+1 ; ; We are going to use a local direct page here. This is because Snap2Grid is ; called by my routine that draws the control's recangle as it is being ; dragged. When that happens, we are not using our normal direct page, and ; hence can't use any of the values or work locations there. So we set up ; another one with it's own workspace. ; phx ; save the pointer to the rectangle pha phb ; save the caller's data bank register phd ; save the caller'd direct page reg. phk ; switch data bank to program bank plb tsc ; switch direct page to stack pointer tcd ; ; WhchGridYX is used to help generalize this routine. We support different ; spacings in the X and Y directions of the grid. As we loop through all 4 ; coordinates of the rectangle, we want to make sure that we are using the ; correct spacing. 'whichGridYX' holds flags that tell us when to use X and ; when to use Y spacing (0 = use Y spacing; 1 = use X spacing). ; lda #%0101 ; Set up some indices into GridYX sta whichGridYX ; ; Fix the coordinates by using the following method: ; ; 1. Get the difference between the coordinate we are examining and ; the next lowest grid location: ; ; z = coordinate mod GridSize ; ; 2. Z tells how far away from the next lowest grid line ; the coordinate we are looking at is, so subtracting that ; value will put the coordinate on the grid. ; ; coordinate := coordinate - z ; ; 3. However, this is simply truncating, and I don't like the ; way that feels when resizing the control. So lets add an ; instruction so that it ROUNDS instead. ; ; if z > GridSize/2 then ; coordinate := coordinate + GridSize ; ldy #6 ; init our loop index Loop ANOP sty YSave lda whichGridYX ; do we now use X or Y grid spacing? and #%0001 beq UseY lda myCtlGridX bra UseIt UseY ANOP lda myCtlGridY ; we now have the gridsize in the Acc UseIt ANOP cmp #2 ; Is it 0 or 1? If so, then skip over blt ShortCircuit ; dividing routine. sta GridSize ; save this for the divide later. pha ; push space on stack for the result pha ; of the divide we are going to do. lda [<rectPtr],y ; push on the coordinate we are pha ; adjusting as the Dividend PushWord GridSize ; push this on as the divisor _UDivide ; unsigned divide pla ; quotient - we don't want it. PullWord Remainder ; remainder is 'z' - Keep it! ldy YSave ; get my coordinate index back. lda [<rectPtr],y ; get the coordinate to change sec sbc Remainder ; change it sta [<rectPtr],y ; save it back out lda GridSize ; Make a GridSize/2 lsr a cmp Remainder ; is remainder < GridSize/2? bge ShortCircuit ; yes - so we're done lda [<rectPtr],y ; no - so bump the coordinate clc adc GridSize sta [<rectPtr],y ShortCircuit lsr whichGridYX ; move the next index into place dey ; bump down to the next coordinate dey ; of the rectangle. bpl Loop Exit ANOP pld ; restore caller's Direct Page reg. plb ; restore data bank register pla ; remove rect pointer pla rts ; all done - go bye-bye whichGridYX ds 2 YSave ds 2 Remainder ds 2 GridSize ds 2 end EJECT ******************************************************************************* * FindPart start * * Description: This routine is called to find out exactly which part of * the control we clicked in. It first checks to see if we * clicked in any of the grow knobs. If so, then it returns * an 'internal partcode' telling the calling routine which * knob was clicked in. If a knob wasn't clicked in, a check * is made to see if we clicked on the frame. If we are * allowed to click in the interior, a check is made to see * if we clicked there, too. * * * Inputs: NONE * * Outputs: A = internal partcode of part hit (1-10) * * External Refs: * Import CalcCorners * * Entry Points: * entry TestFrame ; called by myTestCtl * ******************************************************************************* using CtlData jsr CalcCorners ; ; We first check to see if the mouse was clicked in any of the knobs. We do ; this by assuming a knob was clicked in, and then checking to see if that was ; true. If so, we leave here with the partcode we assumed. If not, we loop ; through and check all of the other knobs. If none of the knobs was clicked ; in, we see if the frame was clicked on. ldx #LeftPart ; get last knob's part code ldy #7*8 ; point to last knob's rect loop ANOP phx ; save partcode we're checking for... phy ; and the rect's pointer pha ; space for _PtInRect result PushLong #theParam ; push on the point to check lda #^knobUL ; create a pointer to the rect pha clc ; Bumping just the low byte is OK tya ; unless the GS suddenly lets adc #knobUL ; code segments cross bank pha ; boundaries _PtInRect pla ; get result of PtInRect ply ; retrieve rectangle index plx ; retrieve part code cmp #0 ; did we score a hit? bne InKnob ; yes, return with the part code dex ; move down to next partcode sec ; move down to next rectangle tya sbc #8 tay bpl loop ; keep going until rect index < 0 bra TestFrame ; not in knobs - try frame ; ; We just scored a hit on one of the knobs, and X holds the knob number. ; However, the application may not have corner or edge knobs active. So ; if we clicked on an inactive knob, have to check for that and return ; 'inFrame' instead of a knob partcode. ; InKnob ANOP ldy #octlFlag ; are corner knobs active? lda [<CtlPtr],y and #knobCornerMask bne ckEdge ; yes - so pass this code on. txa ; Corners not allowed. Did we hit one? lsr a bcs RetFramePart ; yes, so return click on Frame instead ckEdge ANOP ldy #octlFlag ; are edge knobs active? lda [<CtlPtr],y and #knobEdgeMask bne done ; yes - so return this code txa ; Edges not allowed. Did we hit one? lsr a bcs TestFrame ; no, so pass this code on. RetFramePart ANOP ldx #FramePart ; yes, so return click on Frame instead done ANOP txa ; put the part code in the Acc rts TestFrame entry ; First test to see if it is within the Control's rectangle. It should ; be, but let's check anyway... pha PushLong #theParam PushLong #myCtlRect _PtInRect pla beq NotInFrame ; no in the frame. Signal noPart ; Now see if we differentiate between the frame and the interior ldy #octlFlag lda [<CtlPtr],y and #dragIntMask bne RetFramePart ; nope - everything drags ; Yes we do. Now see if we hit the frame fair and square. Inset the ; control's bounding rectangle by the size of the knobs that are on ; it to create an inner rectangle. If we fall between those two ; rectangles, then I say that you have landed on the frame. If we ; got this far, then we know that we are within the outer rectangle. ; Now see if we are outside of the inner rectangle. ldx #6 ; make a copy of the control rect CopyLoop lda myCtlRect,x ; so that we can reduce it. sta innerRect,x dex dex bpl CopyLoop PushLong #innerRect ; push on pointer to the rect to inset PushWord FrameWidth ; push on the amounts to inset it by PushWord FrameHeight ; (these vals inited by CalcCorners) _InsetRect pha ; see if we are outside of the inner PushLong #theParam ; rectangle PushLong #innerRect _PtInRect pla ; check the result beq RetFramePart ; we were between rects! NotInFrame lda #noPart ; Not *exactly* on the frame. rts innerRect ds 8 end