// $Id: pump.cpp 1282 2006-06-09 09:46:49Z alex $ /* @@tag:xara-cn@@ DO NOT MODIFY THIS LINE ================================XARAHEADERSTART=========================== Xara LX, a vector drawing and manipulation program. Copyright (C) 1993-2006 Xara Group Ltd. Copyright on certain contributions may be held in joint with their respective authors. See AUTHORS file for details. LICENSE TO USE AND MODIFY SOFTWARE ---------------------------------- This file is part of Xara LX. Xara LX is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License version 2 as published by the Free Software Foundation. Xara LX and its component source files are distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with Xara LX (see the file GPL in the root directory of the distribution); if not, write to the Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA ADDITIONAL RIGHTS ----------------- Conditional upon your continuing compliance with the GNU General Public License described above, Xara Group Ltd grants to you certain additional rights. The additional rights are to use, modify, and distribute the software together with the wxWidgets library, the wxXtra library, and the "CDraw" library and any other such library that any version of Xara LX relased by Xara Group Ltd requires in order to compile and execute, including the static linking of that library to XaraLX. In the case of the "CDraw" library, you may satisfy obligation under the GNU General Public License to provide source code by providing a binary copy of the library concerned and a copy of the license accompanying it. Nothing in this section restricts any of the rights you have under the GNU General Public License. SCOPE OF LICENSE ---------------- This license applies to this program (XaraLX) and its constituent source files only, and does not necessarily apply to other Xara products which may in part share the same code base, and are subject to their own licensing terms. This license does not apply to files in the wxXtra directory, which are built into a separate library, and are subject to the wxWindows license contained within that directory in the file "WXXTRA-LICENSE". This license does not apply to the binary libraries (if any) within the "libs" directory, which are subject to a separate license contained within that directory in the file "LIBS-LICENSE". ARRANGEMENTS FOR CONTRIBUTION OF MODIFICATIONS ---------------------------------------------- Subject to the terms of the GNU Public License (see above), you are free to do whatever you like with your modifications. However, you may (at your option) wish contribute them to Xara's source tree. You can find details of how to do this at: http://www.xaraxtreme.org/developers/ Prior to contributing your modifications, you will need to complete our contributor agreement. This can be found at: http://www.xaraxtreme.org/developers/contribute/ Please note that Xara will not accept modifications which modify any of the text between the start and end of this header (marked XARAHEADERSTART and XARAHEADEREND). MARKS ----- Xara, Xara LX, Xara X, Xara X/Xtreme, Xara Xtreme, the Xtreme and Xara designs are registered or unregistered trademarks, design-marks, and/or service marks of Xara Group Ltd. All rights in these marks are reserved. Xara Group Ltd, Gaddesden Place, Hemel Hempstead, HP2 6EX, UK. http://www.xara.com/ =================================XARAHEADEREND============================ */ /* // */ #include "camtypes.h" //#include "pump.h" - in camtypes.h [AUTOMATICALLY REMOVED] //#include "ensure.h" - in camtypes.h [AUTOMATICALLY REMOVED] //#include "errors.h" - in camtypes.h [AUTOMATICALLY REMOVED] //#include "list.h" - in camtypes.h [AUTOMATICALLY REMOVED] //#include "listitem.h" - in camtypes.h [AUTOMATICALLY REMOVED] //#include "msg.h" - in camtypes.h [AUTOMATICALLY REMOVED] //#include "document.h" - in camtypes.h [AUTOMATICALLY REMOVED] //#include "docview.h" - in camtypes.h [AUTOMATICALLY REMOVED] //#include "app.h" - in camtypes.h [AUTOMATICALLY REMOVED] #include "comattrmsg.h" #include "optsmsgs.h" #include "colmsg.h" #include "brushmsg.h" #include "ctrllist.h" DECLARE_SOURCE("$Revision: 1282 $"); CC_IMPLEMENT_DYNCREATE(MessageHandler, ListItem) // All message implement macros here CC_IMPLEMENT_DYNAMIC(Msg, CCObject) CC_IMPLEMENT_DYNAMIC(DialogMsg, Msg) CC_IMPLEMENT_DYNAMIC(DeathMsg, Msg) CC_IMPLEMENT_DYNAMIC(OpMsg, Msg) CC_IMPLEMENT_MEMDUMP(MessageHandlerList, ListItem) CC_IMPLEMENT_DYNAMIC(BrushMsg, Msg); CC_IMPLEMENT_DYNAMIC(ScreenChangeMsg, Msg); CC_IMPLEMENT_DYNAMIC(BrushDefMsg, Msg); CC_IMPLEMENT_DYNAMIC(NewBrushMsg, Msg); CC_IMPLEMENT_DYNAMIC(StrokeMsg, Msg); // Declare smart memory handling in Debug builds #define new CAM_DEBUG_NEW List MessageHandler::MessageHandlerClassList; // A list of MessageHandlerClassItems Msg* MessageHandler::pTmpMsg; BOOL MessageHandler::PostDeath = FALSE; /******************************************************************************************** > MessageHandler::MessageHandler(CCRuntimeClass* Class, BOOL SendMessages = TRUE) Author: Simon_Maneggio (Xara Group Ltd) Created: 18/03/94 Inputs: Class: Specifies the MessageHandler list this MessageHandler should be added to. This class must be derived from Class. (See Purpose for a description of how to use this) SendMessages: This flag specifies if the MessageHandler should be added to a message list or not. For example certain operations may not be interested in any messages. Setting SendMessages to FALSE in this situation will make message dispatching more efficient. Outputs: - Returns: - Purpose: If the SendMessage flag is TRUE then this function adds the MessageHandler to a list of MessageHandlers constructed with the same Class parameter. The Class specified should have been registered using RegisterClassGroup during startup. Note: The reason for specifying a class parameter is that it allows you to send messages to selected groups of MessageHandlers. For example if a dialog message is being sent then it is more efficient to broadcast this message only to Operations derived from DialogOperation. So all DialogOpS should specify a DialogOp class in their MessageHandler constructor. It is important not to create too many groups of MessageHandlers as this can lead to inefficient message dispatching. Only create a new group if you see a situation where a message should be sent only to MessageHandlers in that group. Errors: In the retail version: If a MessageHandler list for the class specified does not exist then one is created (because the constructor cannot fail). In the debug version an ENSURE failure will occur. SeeAlso: MessageHandler::Broadcast SeeAlso: MessageHandler::RegisterClassGroup ********************************************************************************************/ MessageHandler::MessageHandler(CCRuntimeClass* Class, BOOL SendMessages) { if (SendMessages) { // The MessageHandler is to receive messages so it needs to be added to a list grouping // all MessageHandlers with the same Class. ListItem* AddMessageHandlerList = NULL; // The list the message handler should be added to. // Firstly determine if there is already a MessageHandlerList to place the MessageHandler on ListItem* CurrentMessageHandlerList = MessageHandlerClassList.GetHead(); while (CurrentMessageHandlerList != NULL) { if (((MessageHandlerList*)CurrentMessageHandlerList)->MessageHandlerClass == Class) { AddMessageHandlerList = CurrentMessageHandlerList; break; } CurrentMessageHandlerList = MessageHandlerClassList.GetNext(CurrentMessageHandlerList); } if (AddMessageHandlerList == NULL) // There is no suitable MessageHandlerList so we // must create one. { // this test can go off when someone forgot to register a class. It can also // go off in DLL builds if a default parameter of CC_RUNTIME_CLASS is used // as the compiler screws up the function call ERROR3_PF( ("Class %s not registered for MessageHandler", Class->GetClassName() ) ); AddMessageHandlerList = new MessageHandlerList(Class); MessageHandlerClassList.AddHead(AddMessageHandlerList); } // Add the MessageHandler to the MessageHandler list ((MessageHandlerList*)AddMessageHandlerList)->m_List.AddHead(this); } } /******************************************************************************************** > static BOOL MessageHandler::RegisterClassGroup(CCRuntimeClass* Class) Author: Simon_Maneggio (Xara Group Ltd) Created: 21/3/94 Inputs: Class: The class group to create. Outputs: - Returns: TRUE if successful, FALSE if memory could not be allocated Purpose: This function should be called to register a Class group at startup eg. Application::Init. See the Message Handler constructor for more information. Errors: ERROR is called if we are out of memory, and FALSE is returned SeeAlso: - ********************************************************************************************/ BOOL MessageHandler::RegisterClassGroup(CCRuntimeClass* Class) { #if _DEBUG // Lets make sure that this class has not already been registered ListItem* CurrentMessageHandlerList = MessageHandlerClassList.GetHead(); while (CurrentMessageHandlerList != NULL) { if (((MessageHandlerList*)CurrentMessageHandlerList)->MessageHandlerClass == Class) { ENSURE(FALSE, "Trying to register a class group which has already been registered"); } CurrentMessageHandlerList = MessageHandlerClassList.GetNext(CurrentMessageHandlerList); } #endif // Create a new Message handler list ListItem* NewMessageHandlerList = new MessageHandlerList(Class); if (NewMessageHandlerList == NULL) return FALSE; MessageHandlerClassList.AddTail(NewMessageHandlerList); return TRUE; } /******************************************************************************************** > List* GetClassList(CCRuntimeClass* Class) Author: Simon_Maneggio (Xara Group Ltd) Created: 22/3/94 Inputs: Class: The class group Outputs: - Returns: The list of MessageHandlers in the Class group, NULL if the class group could not be found Purpose: For obtaining a pointer to a list of MessageHandlers in the specified class group. Errors: An ENSURE will occur if the class group could not be found SeeAlso: - ********************************************************************************************/ List* MessageHandler::GetClassList(CCRuntimeClass* Class) { ListItem* CurrentMessageHandlerList = MessageHandlerClassList.GetHead(); while (CurrentMessageHandlerList != NULL) { if (((MessageHandlerList*)CurrentMessageHandlerList)->MessageHandlerClass == Class) { return (&(((MessageHandlerList*)CurrentMessageHandlerList)->m_List)); } CurrentMessageHandlerList = MessageHandlerClassList.GetNext(CurrentMessageHandlerList); } ENSURE(FALSE, "Could not find class list"); return NULL; } /******************************************************************************************** > static BOOL MessageHandler::MessageHandlerExists(CCRuntimeClass* Class) Author: Simon_Maneggio (Xara Group Ltd) Created: 26/08/94 Inputs: Class: The message handler's runtime class Outputs: - Returns: TRUE if a MessageHandler exists with runtime class 'Class' Purpose: Searches for a message handler with runtime class (Class). eg. to determine if there is a 'live' BlobbyDlg operation if (MessageHandler::MessageHandlerExists(CC_RUNTIME_CLASS(DialogOp,BlobbyDlg))) { // ... } Errors: - SeeAlso: - ********************************************************************************************/ BOOL MessageHandler::MessageHandlerExists(CCRuntimeClass* Class) { const CCRuntimeClass* BaseClass; // Search for the class list MessageHandlerList* CurrentMessageHandlerList = (MessageHandlerList*)(MessageHandlerClassList.GetHead()); while (CurrentMessageHandlerList != NULL) { BaseClass = Class; // An instance of the Class message handler could be on any Class group list // which it is derived from while (BaseClass != NULL) { if (BaseClass == CurrentMessageHandlerList->MessageHandlerClass) { // Could be on this list ! // Search for a message handler with class 'Class' MessageHandler* MHandler = (MessageHandler*) (CurrentMessageHandlerList->m_List.GetHead()); while (MHandler != NULL) { if (MHandler->GetRuntimeClass() == Class) { return TRUE; } MHandler = (MessageHandler*) (CurrentMessageHandlerList->m_List.GetNext(MHandler)); } break; } BaseClass = BaseClass->GetBaseClass1(); } CurrentMessageHandlerList = (MessageHandlerList*)MessageHandlerClassList.GetNext(CurrentMessageHandlerList); } return FALSE; } /******************************************************************************************** > MessageHandler::~MessageHandler() Author: Simon_Maneggio (Xara Group Ltd) Created: 15/2/94 Inputs: - Outputs: - Returns: - Purpose: MessageHandler destructor, removes the MessageHandler from a MessageHandler list, if it's on one. Errors: - SeeAlso: - ********************************************************************************************/ MessageHandler::~MessageHandler() { SendNoMoreMessages(this); // Removes the Message Handler from any Message list // it may have been on. } /******************************************************************************************** > static MsgResult MessageHandler::Broadcast(Msg* Msg, CCRuntimeClass* Class = NULL) Author: Simon_Maneggio (Xara Group Ltd) Created: 18/2/94 Inputs: Msg - The message to send this will be deleted after the message has been sent Class - Class specifies which MessageHandlers you wish to send the message to.If Class = NULL (which is the default) then the message is sent to all MessageHandlers, otherwise the message is sent only to those MessageHandlers with a runtime class Class, or a class derived from Class. Outputs: - Returns: A value of OK or EAT_MSG indicates that the message was successfully sent to the MessageHandler objects. i.e. the MessageHandlers Message functions all returned either OK, or EAT_MSG. OK means that message got sent to all specified MessageHandlers and all of them return OK. This does not imply than anyone acted on the message of course. EAT_MSG means that a handler processed the message and didn't want it to be passed on. A FAIL value indicates that one or more Message handlers returned a FAIL value from their Message functions. In this situation the broadcast function will call InformError describing the first error which occured. Purpose: Sends a message to the specified MessageHandlers. Note that you should not use this function directly. Instead use one of the BROADCAST macros SeeAlso: MessageHandler::Message SeeAlso: MessageHandler::RegisterClassGroup SeeAlso: BROADCAST_TO_ALL SeeAlso: BROADCAST_TO_CLASS ********************************************************************************************/ MsgResult MessageHandler::Broadcast(Msg* Message, CCRuntimeClass* Class) { // If the DeathMsg has been sent to all MessageHandlers then we won't allow any more // broadcasts... if (PostDeath) { delete Message; return (OK); } // Indicate we may need to refresh button states on exit // ControlList::Get()->Changed(); /* Document* pOldCurDoc = Document::GetCurrent(); View* pOldCurView = View::GetCurrent(); */ if (Class == NULL) { // Send the message to all Message Handlers Class = CC_RUNTIME_CLASS(MessageHandler); }; MessageHandlerList* CurrentMessageHandlerList = (MessageHandlerList*)(MessageHandlerClassList.GetHead()); ListItem* CurrentMessageHandler; ListItem* NextMessageHandler; BOOL Result; #ifdef _DEBUG BOOL FoundClassGrp = FALSE; #endif BOOL Failed = FALSE; // Set to TRUE if a Message fn returns FAIL String_256 FirstErrStr; // Used to save the first error description set UINT32 FirstErrMod=0; while (CurrentMessageHandlerList != NULL) { // Determine if we should send messages to the objects in the // list const CCRuntimeClass* GroupClass = CurrentMessageHandlerList-> MessageHandlerClass; while (GroupClass != NULL) { if (GroupClass == Class) { #ifdef _DEBUG FoundClassGrp = TRUE; #endif // GroupClass is equal to or derived from Class // Send the message to every MessageHandler in the list CurrentMessageHandler = CurrentMessageHandlerList->m_List.GetHead(); while (CurrentMessageHandler != NULL) { // Get the next message handler now cos there is no guarantee that // CurrentMessageHandler will survive. NextMessageHandler = (MessageHandlerList*) (CurrentMessageHandlerList->m_List.GetNext(CurrentMessageHandler)); Result = ((MessageHandler*)CurrentMessageHandler)-> Message(Message); // Send the message if (Result == EAT_MSG) { delete Message; /* // We need to restore the old current doc and view's, // but they may have been deleted, so we must first // check that they are still in the doc list. Document *pDoc = (Document *) Camelot.Documents.GetHead(); while (pDoc != NULL) { if (pDoc == pOldCurDoc) { // Restore the old current values if (pOldCurView) pOldCurView->SetCurrent(); else View::SetNoCurrent(); if (pOldCurDoc) pOldCurDoc->SetCurrent(); else Document::SetNoCurrent(); break; } pDoc = (Document *) Camelot.Documents.GetNext(pDoc); } */ return EAT_MSG; // The message has been eaten } if (Result == FAIL) { // If we have failed previously then we need not do anything special if (!Failed) { // Record the error which was set, we will restore this value prior // to returning from the function. FirstErrStr = Error::GetErrorString(); FirstErrMod = Error::GetErrorModule(); Failed = TRUE; // So we don't record the error again } // Continue to send the message on to other MessageHandlers } // Get the next Message Handler CurrentMessageHandler = NextMessageHandler; } break; } GroupClass = GroupClass->GetBaseClass1(); } CurrentMessageHandlerList = (MessageHandlerList*) (MessageHandlerClassList.GetNext(CurrentMessageHandlerList)); } // If we have just sent the DeathMsg then flag that we will allow no more! CCRuntimeClass* MsgType = Message->GetRuntimeClass(); if (MsgType==CC_RUNTIME_CLASS(DeathMsg)) { PostDeath = TRUE; } delete Message; #ifdef _DEBUG ENSURE(FoundClassGrp, "Message cannot be sent"); #endif /* // Restore the old current values if (pOldCurView) pOldCurView->SetCurrent(); else View::SetNoCurrent(); if (pOldCurDoc) pOldCurDoc->SetCurrent(); else Document::SetNoCurrent(); */ if (Failed) { // Restore the error Error::SetError(0, FirstErrStr, FirstErrMod); InformError(); return FAIL; } else { return OK; } } /******************************************************************************************** > virtual MsgResult MessageHandler::Message(Msg* Message) Author: Simon_Maneggio (Xara Group Ltd) Created: 18/2/94 Inputs: Message: The message Returns: OK Message handled ok (return this even if you don't need to respond to the message). FAIL Something terrible happened whilst processing the message eg. we ran out of memory. You must set ERROR if you are returning this value. The message will continue to be sent to other MessageHandlers. EAT_MSG The Message was handled ok but don't send it to any more MessageHandlers. Purpose: The default message handler receives global messages, extracts information from them and then calls virtual On handlers. Errors: You must set ERROR if you are returning FAIL. SeeAlso: Operation::Broadcast ********************************************************************************************/ MsgResult MessageHandler::Message(Msg* Message) { // Find out the type of the message CCRuntimeClass* MsgType = Message->GetRuntimeClass(); if (MsgType==CC_RUNTIME_CLASS(DeathMsg)) { return(OnDeathMsg() ? OK : FAIL); } else if (MsgType==CC_RUNTIME_CLASS(SelChangingMsg)) { return(OnSelChangingMsg( ((SelChangingMsg*)Message)->State ) ? OK: FAIL); } else if (MsgType==CC_RUNTIME_CLASS(ColourChangingMsg)) { return(OnColourChangingMsg((ColourChangingMsg*)Message) ? OK: FAIL); } else if (MsgType==CC_RUNTIME_CLASS(DocViewMsg)) { DocViewMsg* DVMsg = (DocViewMsg*)Message; return(OnDocViewMsg(DVMsg->pNewDocView, DVMsg->State) ? OK: FAIL); } #if !defined(EXCLUDE_FROM_RALPH) else if (MsgType==CC_RUNTIME_CLASS(BarMsg)) { return(OnBarMsg((BarMsg*)Message) ? OK: FAIL); } #endif else if (MsgType==CC_RUNTIME_CLASS(DocChangingMsg)) { DocChangingMsg* DCMsg = (DocChangingMsg*)Message; return(OnDocChangingMsg(DCMsg->pChangingDoc, DCMsg->State) ? OK: FAIL); } #if !defined(EXCLUDE_FROM_RALPH) else if (MsgType==CC_RUNTIME_CLASS(OptionsChangingMsg)) { return(OnOptionsChangingMsg((OptionsChangingMsg*)Message) ? OK: FAIL); } #endif else if (MsgType==CC_RUNTIME_CLASS(CommonAttrsChangedMsg)) { return(OnCommonAttrsChangedMsg() ? OK: FAIL); } else return OK; } /******************************************************************************************** > static void MessageHandler::SendNoMoreMessages(MessageHandler* MessageHandlerToRemove); Author: Simon_Maneggio (Xara Group Ltd) Created: 18/3/94 Inputs: - Outputs: - Returns: - Purpose: Call this function when you want Messages to stop being sent to the MessageHandler. The MessageHandler is simply removed from its message handler list. It is quite safe to call this function even if the MessageHandler does not receive messages. The Operation's End method exploits this. Errors: - Scope: protected. SeeAlso: - ********************************************************************************************/ void MessageHandler::SendNoMoreMessages(MessageHandler* MessageHandlerToRemove) { MessageHandlerList* CurrentMessageHandlerList = (MessageHandlerList*)MessageHandlerClassList.GetHead(); while (CurrentMessageHandlerList != NULL) { // The MessageHandler could be on this list if ((CurrentMessageHandlerList->m_List.FindPosition(MessageHandlerToRemove)) >= 0) // yuk { // The message handler is on the list CurrentMessageHandlerList->m_List.RemoveItem(MessageHandlerToRemove); break; } CurrentMessageHandlerList = (MessageHandlerList*) (MessageHandlerClassList.GetNext(CurrentMessageHandlerList)); } } /******************************************************************************************** > static void Destroy() Author: Simon_Maneggio (Xara Group Ltd) Created: 21/3/94 Inputs: - Outputs: - Returns: - Purpose: This static function should be Called before we quit Camelot. It deletes all message handler class lists. SeeAlso: - ********************************************************************************************/ void MessageHandler::Destroy() { ListItem* CurrentMessageHandlerList = MessageHandlerClassList.GetHead(); while (CurrentMessageHandlerList != NULL) { ListItem* NextItem = MessageHandlerClassList.GetNext(CurrentMessageHandlerList); delete( MessageHandlerClassList.RemoveItem(CurrentMessageHandlerList) ); CurrentMessageHandlerList = NextItem; } } // ------------------------------------------------------------------------------------------ // OnMessage handlers // If you are going to add new On handlers then you should do so here // these functions should either return a BOOL or a MsgResult value. // If they return a BOOL then TRUE will be equivelent to a OK MsgResult value, and FALSE // should be equivelent to a FAIL MsgResult value. /******************************************************************************************** > inline virtual BOOL OnDeathMsg(void) { return TRUE }; Author: Simon_Maneggio (Xara Group Ltd) Created: 15/6/94 Inputs: - Outputs: - Returns: A FALSE value is equivalent to the Message functions FAIL return value, A TRUE value is equivalent to the Message functions OK return value. refer to MessageHandler::Message Purpose: Called by the Message fn when a death message is received See DeathMsg for a description Errors: - SeeAlso: DeathMsg SeeAlso: MessageHandler::Message ********************************************************************************************/ /******************************************************************************************** > virtual BOOL OnSelChanging(SelectionState State) {return TRUE}; Author: Simon_Maneggio (Xara Group Ltd) Created: 15/6/94 Inputs: - Outputs: - Returns: A FALSE value is equivalent to the Message functions FAIL return value, A TRUE value is equivalent to the Message functions OK return value. refer to MessageHandler::Message Purpose: Called by the Message fn when a SelChangingMsg message is received Errors: - SeeAlso: SelChangingMsg ********************************************************************************************/ /******************************************************************************************** virtual BOOL OnColourChangingMsg(ColourChangingMsg* Msg) { return TRUE; }; Author: Simon_Maneggio (Xara Group Ltd) Created: 15/6/94 Inputs: - Outputs: - Returns: A FALSE value is equivalent to the Message functions FAIL return value, A TRUE value is equivalent to the Message functions OK return value. refer to MessageHandler::Message Purpose: Called by the Message fn when a ColourChangingMsg message is received Errors: - SeeAlso: ColourChangingMsg ********************************************************************************************/ /******************************************************************************************** > virtual BOOL OnDocViewMsg(DocView* pDocView, DocViewState State) {return TRUE}; Author: Simon_Maneggio (Xara Group Ltd) Created: 15/6/94 Inputs: - Outputs: - Returns: A FALSE value is equivalent to the Message functions FAIL return value, A TRUE value is equivalent to the Message functions OK return value. refer to MessageHandler::Message Purpose: Called by the Message fn when a DocViewMsg message is received Errors: - SeeAlso: DocViewMsg ********************************************************************************************/ /******************************************************************************************** > virtual BOOL OnBarMsg(BarMsg* Msg) {return OK}; Author: Simon_Maneggio (Xara Group Ltd) Created: 15/6/94 Inputs: - Outputs: - Returns: A FALSE value is equivalent to the Message functions FAIL return value, A TRUE value is equivalent to the Message functions OK return value. refer to MessageHandler::Message Purpose: Called by the Message fn when a BarMsg is received Errors: - SeeAlso: BarMsg ********************************************************************************************/ /******************************************************************************************** > virtual BOOL OnDocChangingMsg(Document* pChangingDoc, DocState State) {return OK}; Author: Simon_Maneggio (Xara Group Ltd) Created: 15/6/94 Inputs: - Outputs: - Returns: A FALSE value is equivalent to the Message functions FAIL return value, A TRUE value is equivalent to the Message functions OK return value. refer to MessageHandler::Message Purpose: Called by the Message fn when a DocChangingMsg is received Errors: - SeeAlso: DocChangingMsg ********************************************************************************************/ /******************************************************************************************** > MessageHandlerList::MessageHandlerList(CCRuntimeClass* Class) Author: Simon_Maneggio (Xara Group Ltd) Created: 22/3/94 Inputs: Class: Class group Outputs: - Returns: - Purpose: MessageHandlerList constructor Errors: - SeeAlso: MessageHandler ********************************************************************************************/ MessageHandlerList::MessageHandlerList(CCRuntimeClass* Class) { MessageHandlerClass = Class; }