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implementation module menuevent


//	Clean Object I/O library, version 1.2

/*	menuevent defines the DeviceEventFunction for the menu device.
	This function is placed in a separate module because it is platform dependent.
*/


import	StdBool, StdList, StdMisc
import	clCrossCall_12
from	clCCall_12			import WinMakeCString, CSTR, ALTBIT, CTRLBIT, SHIFTBIT
from	osmenu				import OSMenuItemCheck
import	commondef, deviceevents, iostate
from	menuaccess			import menuStateHandleGetHandle, menuStateHandleGetMenuId
from	processstack		import topShowProcessShowState
from	StdProcessAttribute	import getProcessToolbarAtt, isProcessToolbar
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from	StdPSt				import accPIO
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menueventFatalError :: String String -> .x
menueventFatalError function error
	= FatalError function "menuevent" error


/*	menuEvent filters the scheduler events that can be handled by this menu device.
	For the time being no timer menu elements are added, so these events are ignored.
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	menuEvent assumes that it is not applied to an empty IOSt and that its device is
	present.
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*/
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menuEvent :: !SchedulerEvent !(PSt .l) -> (!Bool,!Maybe DeviceEvent,!SchedulerEvent,!PSt .l)
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menuEvent schedulerEvent pState
	# (hasMenuDevice,pState)	= accPIO (IOStHasDevice MenuDevice) pState
	| not hasMenuDevice			// This condition should never hold
		= menueventFatalError "menuEvent" "MenuDevice.dEvent applied while MenuDevice not present in IOSt"
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	| otherwise
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		= menuEvent schedulerEvent pState
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where
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	menuEvent :: !SchedulerEvent !(PSt .l) -> (!Bool,!Maybe DeviceEvent,!SchedulerEvent,!PSt .l)
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	menuEvent schedulerEvent=:(ScheduleOSEvent osEvent=:{ccMsg} _) pState=:{io=ioState}
		| isToolbarOSEvent ccMsg
			# (osdInfo,ioState)				= IOStGetOSDInfo ioState
			# (myEvent,replyToOS,deviceEvent,ioState)
											= filterToolbarEvent osdInfo osEvent ioState
			# pState						= {pState & io=ioState}
			  schedulerEvent				= if (isJust replyToOS) (ScheduleOSEvent osEvent (fromJust replyToOS)) schedulerEvent
			= (myEvent,deviceEvent,schedulerEvent,pState)
		| isMenuOSEvent ccMsg
			# (processStack,ioState)		= IOStGetProcessStack ioState
			  (found,systemId)				= topShowProcessShowState processStack
			# (ioId,ioState)				= IOStGetIOId ioState
			# (tb,ioState)					= getIOToolbox ioState
			# (found,mDevice,ioState)		= IOStGetDevice MenuDevice ioState
			# menus							= MenuSystemStateGetMenuHandles mDevice
			# (myEvent,replyToOS,deviceEvent,menus,tb)
			  								= filterOSEvent osEvent (found && systemId==ioId) menus tb
			# ioState						= IOStSetDevice (MenuSystemState menus) ioState
			# ioState						= setIOToolbox tb ioState
			# pState						= {pState & io=ioState}
			  schedulerEvent				= if (isJust replyToOS) (ScheduleOSEvent osEvent (fromJust replyToOS)) schedulerEvent
			= (myEvent,deviceEvent,schedulerEvent,pState)
		| otherwise
			= (False,Nothing,schedulerEvent,pState)
	where
		isMenuOSEvent :: !Int -> Bool
		isMenuOSEvent CcWmCOMMAND				= True
		isMenuOSEvent _							= False
		
		isToolbarOSEvent :: !Int -> Bool
		isToolbarOSEvent CcWmBUTTONCLICKED		= True
		isToolbarOSEvent CcWmGETTOOLBARTIPTEXT	= True
		isToolbarOSEvent _						= False
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	menuEvent schedulerEvent=:(ScheduleMsgEvent msgEvent) pState=:{io=ioState}
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		# (ioId,ioState)				= IOStGetIOId ioState
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		| ioId<>recLoc.rlIOId || recLoc.rlDevice<>MenuDevice
			= (False,Nothing,schedulerEvent,{pState & io=ioState})
		| otherwise
			# (found,mDevice,ioState)	= IOStGetDevice MenuDevice ioState
			  menus						= MenuSystemStateGetMenuHandles mDevice
			  (found,menus)				= hasMenuHandlesMenu recLoc.rlParentId menus
			  deviceEvent				= if found (Just (ReceiverEvent msgEvent)) Nothing
			# ioState					= IOStSetDevice (MenuSystemState menus) ioState
			= (found,deviceEvent,schedulerEvent,{pState & io=ioState})
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	where
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		recLoc							= getMsgEventRecLoc msgEvent
		
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		hasMenuHandlesMenu :: !Id !*(MenuHandles .pst) -> (!Bool,!*MenuHandles .pst)
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		hasMenuHandlesMenu menuId mHs=:{mMenus}
			# (found,mMenus)= UContains (eqMenuId menuId) mMenus
			= (found,{mHs & mMenus=mMenus})
		where
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			eqMenuId :: !Id !*(MenuStateHandle .pst) -> *(!Bool,!*MenuStateHandle .pst)
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			eqMenuId theId msH
				# (mId,msH)	= menuStateHandleGetMenuId msH
				= (theId==mId,msH)
	
	menuEvent schedulerEvent pState
		= (False,Nothing,schedulerEvent,pState)
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/*	filterToolbarEvent filters the OSEvents that can be handled by this menu device.
*/
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filterToolbarEvent :: !OSDInfo !OSEvent !(IOSt .l) -> (!Bool,!Maybe [Int],!Maybe DeviceEvent,!IOSt .l)
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/*	CcWmBUTTONCLICKED is a menu event in case of a toolbar selection. 
*/
filterToolbarEvent osdInfo {ccMsg=CcWmBUTTONCLICKED,p2=toolbarPtr,p4=toolbarIndex} ioState
	| isToolbarEvent osdInfo toolbarPtr
		= (True,Nothing,Just (ToolbarSelection {tbsItemNr=toolbarIndex}),ioState)
	| otherwise
		= (False,Nothing,Nothing,ioState)

/*	CcWmGETTOOLBARTIPTEXT does not continue platform independent event handling, but returns the 
	String associated with the requested toolbar item.
*/
filterToolbarEvent osdInfo {ccMsg=CcWmGETTOOLBARTIPTEXT,p1=toolbarPtr,p2=toolbarIndex} ioState
	| isToolbarEvent osdInfo toolbarPtr
		# (atts,ioState)		= IOStGetProcessAttributes ioState
		  (found,att)			= Select isProcessToolbar undef atts
		| not found
			= (True,Nothing,Nothing,ioState)
		# maybe_tip				= gettooltip toolbarIndex (getProcessToolbarAtt att)
		| isNothing maybe_tip
			= (True,Nothing,Nothing,ioState)
		// otherwise
			# (textptr,ioState)	= accIOToolbox (WinMakeCString (fromJust maybe_tip)) ioState
			= (True,Just [textptr],Nothing,ioState)
	| otherwise
		= (False,Nothing,Nothing,ioState)
where
	gettooltip :: !Int ![ToolbarItem .pst] -> Maybe String
	gettooltip i [item:items]
		| i==1 && isItem	= tip
		| otherwise			= gettooltip i` items
	where
		(isItem,i`,tip)		= case item of
								ToolbarItem _ tip _	-> (True,i-1,tip)
								ToolbarSeparator	-> (False,i,Nothing)
	gettooltip _ _
		= Nothing

filterToolbarEvent _ _ _
	= menueventFatalError "filterToolbarEvent" "unmatched OSEvent"


/*	filterOSEvent filters the OSEvents that can be handled by this menu device.
		The Bool argument is True iff the parent process is visible and active.
*/
filterOSEvent :: !OSEvent !Bool !(MenuHandles .pst) !*OSToolbox -> (!Bool,!Maybe [Int],!Maybe DeviceEvent,!MenuHandles .pst,!*OSToolbox)

/*	CcWmCOMMAND returns the selected menu item.
	This item is identified by:
	-	the top level menu Id,
	-	a possibly empty list of parent sub menus. This list is given by zero based indices starting from the top level menu.
	-	in the parent (sub) menu, the zero based index of the item.
	Only MenuItemHandle and SubMenuHandle elements increase the index; all other elements don't.
*/
filterOSEvent {ccMsg=CcWmCOMMAND,p1=item,p2=mods} _ menus=:{mEnabled,mMenus=mHs} tb
	| not mEnabled
		= (False,Nothing,Nothing,menus,tb)
	| otherwise
		# (found,deviceEvent,mHs,tb)= getSelectedMenuStateHandlesItem item mods mHs tb
		= (found,Nothing,deviceEvent,{menus & mMenus=mHs},tb)
where
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	getSelectedMenuStateHandlesItem :: !Int !Int !*[*MenuStateHandle .pst] !*OSToolbox
					-> (!Bool,!Maybe DeviceEvent,!*[*MenuStateHandle .pst],!*OSToolbox)
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	getSelectedMenuStateHandlesItem item mods msHs tb
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		# (empty,msHs)					= u_isEmpty msHs
		| empty
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			= (False,Nothing,msHs,tb)
		# (msH,msHs)					= HdTl msHs
		# (found,menuEvent,msH,tb)		= getSelectedMenuStateHandleItem item mods msH tb
		| found
			= (found,menuEvent,[msH:msHs],tb)
		| otherwise
			# (found,menuEvent,msHs,tb)	= getSelectedMenuStateHandlesItem item mods msHs tb
			= (found,menuEvent,[msH:msHs],tb)
	where
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		getSelectedMenuStateHandleItem :: !Int !Int !*(MenuStateHandle .pst) !*OSToolbox
						-> (!Bool,!Maybe DeviceEvent,!*MenuStateHandle .pst, !*OSToolbox)
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		getSelectedMenuStateHandleItem item mods msH=:(MenuLSHandle mlsH=:{mlsHandle=mH=:{mSelect,mHandle,mMenuId,mItems}}) tb
			| not mSelect
				= (False,Nothing,msH,tb)
			| otherwise
				# (found,menuEvent,_,_,itemHs,tb)	= getSelectedMenuElementHandlesItem item mHandle mMenuId mods [] 0 mItems tb
				= (found,menuEvent,MenuLSHandle {mlsH & mlsHandle={mH & mItems=itemHs}},tb)
		where
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			getSelectedMenuElementHandlesItem :: !Int !OSMenu !Id !Int ![Int] !Int !*[*MenuElementHandle .ls .pst] !*OSToolbox
										  -> (!Bool,!Maybe DeviceEvent,![Int],!Int,!*[*MenuElementHandle .ls .pst],!*OSToolbox)
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			getSelectedMenuElementHandlesItem item mH menuId mods parents zIndex itemHs tb
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				# (empty,itemHs)							= u_isEmpty itemHs
				| empty
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					= (False,Nothing,parents,zIndex,itemHs,tb)
				# (itemH,itemHs)							= HdTl itemHs
				# (found,menuEvent,parents,zIndex,itemH,tb)	= getSelectedMenuElementHandle item mH menuId mods parents zIndex itemH tb
				| found
					= (found,menuEvent,parents,zIndex,[itemH:itemHs],tb)
				| otherwise
					# (found,menuEvent,parents,zIndex,itemHs,tb)= getSelectedMenuElementHandlesItem item mH menuId mods parents zIndex itemHs tb
					= (found,menuEvent,parents,zIndex,[itemH:itemHs],tb)
			where
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				getSelectedMenuElementHandle :: !Int !OSMenu !Id !Int ![Int] !Int !*(MenuElementHandle .ls .pst) !*OSToolbox
										 -> (!Bool,!Maybe DeviceEvent,![Int],!Int, !*MenuElementHandle .ls .pst, !*OSToolbox)
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				getSelectedMenuElementHandle item mH menuId mods parents zIndex itemH=:(MenuItemHandle {mOSMenuItem,mItemId}) tb
					| item==mOSMenuItem
						= (True,Just (MenuTraceEvent {mtId=menuId,mtParents=parents,mtItemNr=zIndex,mtModifiers=toModifiers mods}),parents,zIndex+1,itemH,tb)
					| otherwise
						= (False,Nothing,parents,zIndex+1,itemH,tb)
				
				getSelectedMenuElementHandle item mH menuId mods parents zIndex itemH=:(SubMenuHandle submenuH=:{mSubSelect,mSubHandle,mSubItems}) tb
					| not mSubSelect
						= (False,Nothing,parents,zIndex+1,itemH,tb)
					| otherwise
						# (found,menuEvent,parents1,_,itemHs,tb)
									= getSelectedMenuElementHandlesItem item mSubHandle menuId mods (parents++[zIndex]) 0 mSubItems tb
						  itemH		= SubMenuHandle {submenuH & mSubItems=itemHs}
						  parents	= if found parents1 parents
						= (found,menuEvent,parents,zIndex+1,itemH,tb)
				
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			/*	getSelectedMenuElementHandle item mH menuId mods parents zIndex (RadioMenuHandle rH=:{mRadioSelect,mRadioItems=itemHs,mRadioIndex}) tb
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					# (nrRadios,itemHs)	= Ulength itemHs
					| not mRadioSelect
						= (False,Nothing,parents,zIndex+nrRadios,RadioMenuHandle {rH & mRadioItems=itemHs},tb)
					# (found,menuEvent,parents,zIndex1,itemHs,tb)	= getSelectedMenuElementHandlesItem item mH menuId mods parents zIndex itemHs tb
					| not found
						= (found,menuEvent,parents,zIndex1,RadioMenuHandle {rH & mRadioItems=itemHs},tb)
					# curIndex	= mRadioIndex
					  newIndex	= zIndex1-zIndex
					| curIndex==newIndex
						= (found,menuEvent,parents,zIndex1,RadioMenuHandle {rH & mRadioItems=itemHs},tb)
					| otherwise
						# curH	= getMenuItemOSMenuItem (itemHs!!(curIndex-1))
						  newH	= getMenuItemOSMenuItem (itemHs!!(newIndex-1))
						# tb	= OSMenuItemCheck False mH curH tb
						# tb	= OSMenuItemCheck True  mH newH tb
						= (found,menuEvent,parents,zIndex1,RadioMenuHandle {rH & mRadioItems=itemHs,mRadioIndex=newIndex},tb)
				where
					getMenuItemOSMenuItem :: !(MenuElementHandle .ls .pst) -> OSMenuItem
					getMenuItemOSMenuItem (MenuItemHandle {mOSMenuItem}) = mOSMenuItem
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			*/	
				getSelectedMenuElementHandle item mH menuId mods parents zIndex (RadioMenuHandle rH=:{mRadioSelect,mRadioItems=itemHs,mRadioIndex}) tb
					# (nrRadios,itemHs)	= Ulength itemHs
					| not mRadioSelect
						= (False,Nothing,parents,zIndex+nrRadios,RadioMenuHandle {rH & mRadioItems=itemHs},tb)
					# (found,menuEvent,parents,zIndex1,itemHs,tb)	= getSelectedMenuElementHandlesItem item mH menuId mods parents zIndex itemHs tb
					| not found
						= (found,menuEvent,parents,zIndex1,RadioMenuHandle {rH & mRadioItems=itemHs},tb)
					# curIndex	= mRadioIndex
					  newIndex	= zIndex1-zIndex
					| curIndex==newIndex
						= (found,menuEvent,parents,zIndex1,RadioMenuHandle {rH & mRadioItems=itemHs},tb)
					| otherwise
						# (before,[itemH:after])= splitAt (curIndex-1) itemHs
						# (curH,itemH)			= getMenuItemOSMenuItem itemH
						# (before,[itemH:after])= splitAt (newIndex-1) (before ++ [itemH:after])
						# (newH,itemH)			= getMenuItemOSMenuItem itemH
						# tb					= OSMenuItemCheck False mH curH tb
						# tb					= OSMenuItemCheck True  mH newH tb
						= (found,menuEvent,parents,zIndex1,RadioMenuHandle {rH & mRadioItems=before ++ [itemH:after],mRadioIndex=newIndex},tb)
				where
					getMenuItemOSMenuItem :: !*(MenuElementHandle .ls .pst) -> (!OSMenuItem,!MenuElementHandle .ls .pst)
					getMenuItemOSMenuItem itemH=:(MenuItemHandle {mOSMenuItem}) = (mOSMenuItem,itemH)
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				getSelectedMenuElementHandle item mH menuId mods parents zIndex (MenuListLSHandle itemHs) tb
					# (found,menuEvent,parents,zIndex,itemHs,tb)	= getSelectedMenuElementHandlesItem item mH menuId mods parents zIndex itemHs tb
					= (found,menuEvent,parents,zIndex,MenuListLSHandle itemHs,tb)
				
				getSelectedMenuElementHandle item mH menuId mods parents zIndex (MenuExtendLSHandle mExH=:{mExtendItems=itemHs}) tb
					# (found,menuEvent,parents,zIndex,itemHs,tb)	= getSelectedMenuElementHandlesItem item mH menuId mods parents zIndex itemHs tb
					= (found,menuEvent,parents,zIndex,MenuExtendLSHandle {mExH & mExtendItems=itemHs},tb)
				
				getSelectedMenuElementHandle item mH menuId mods parents itemNr (MenuChangeLSHandle mChH=:{mChangeItems=itemHs}) tb
					# (found,menuEvent,parents,zIndex,itemHs,tb)	= getSelectedMenuElementHandlesItem item mH menuId mods parents zIndex itemHs tb
					= (found,menuEvent,parents,zIndex,MenuChangeLSHandle {mChH & mChangeItems=itemHs},tb)
				
				getSelectedMenuElementHandle _ _ _ _ parents zIndex itemH tb
					= (False,Nothing,parents,zIndex,itemH,tb)

filterOSEvent _ _ _ _
	= menueventFatalError "filterOSEvent" "unmatched OSEvent"


//	PA: this function is also defined identically in windowevent.
toModifiers :: !Int -> Modifiers
toModifiers i
	=	{	shiftDown	= shifton
		,	optionDown	= alton
		,	commandDown	= ctrlon
		,	controlDown	= ctrlon
		,	altDown		= alton
		}
where
	shifton	= i bitand SHIFTBIT <> 0
	alton	= i bitand ALTBIT   <> 0
	ctrlon	= i bitand CTRLBIT  <> 0

//	isToolbarEvent checks whether the toolbar equals the OSDInfo toolbar.
isToolbarEvent :: !OSDInfo !OSWindowPtr -> Bool
isToolbarEvent osdInfo toolbarPtr
	| isNothing maybeToolbar	= False
	| otherwise					= (fromJust maybeToolbar).toolbarPtr==toolbarPtr
where
	maybeToolbar				= getOSDInfoOSToolbar osdInfo

MenuHandlesGetMenuStateHandles :: !(MenuHandles .pst) -> (![MenuStateHandle .pst],!MenuHandles .pst)
MenuHandlesGetMenuStateHandles mHs=:{mMenus}
	= (mMenus,{mHs & mMenus=[]})