163 lines
6.6 KiB
C++
163 lines
6.6 KiB
C++
// Ryzom - MMORPG Framework <http://dev.ryzom.com/projects/ryzom/>
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// Copyright (C) 2010 Winch Gate Property Limited
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//
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Affero General Public License as
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// published by the Free Software Foundation, either version 3 of the
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// License, or (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Affero General Public License for more details.
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//
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// You should have received a copy of the GNU Affero General Public License
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// along with this program. If not, see <http://www.gnu.org/licenses/>.
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#ifndef CL_INTERFACE_LINK_H
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#define CL_INTERFACE_LINK_H
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#include "../cdb.h"
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#include "nel/misc/smart_ptr.h"
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class CInterfaceElement;
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class ICDBNode;
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class CCDBNodeLeaf;
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class CReflectedProperty;
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class CInterfaceExprValue;
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class CInterfaceGroup;
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class CInterfaceExprNode;
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/** A link in an interface.
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* A link is an object that can read one or several values from the database, that can evaluate an expression
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* on these database entries (simple computation, using the CInterfaceExpr class), and that can affect the result to
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* an interface property that has been exported by an interface element (the export system uses reflect.h).
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* The first time it is created, it places observers on the database entries that are needed by the expression, so each
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* time a database value changes, the link is marked as 'triggered'
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* When updateTrigeredLinks() is called, all links are effectively updated.
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*
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* Example of use : connecting a change in the db tree to the 'active' state of a window
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*
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* NB : an additionnal action handler can be provided
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* NB : The links are owned by the interface element (using a smart pointer)
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* NB : Several targets may be used.
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*
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* \author Nicolas Vizerie
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* \author Nevrax France
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* \date 2002
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*/
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class CInterfaceLink : public ICDBNode::IPropertyObserver
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{
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public:
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#ifdef NL_DEBUG
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// for debugging purposes : if this link is 'named' e.g is owner by CInterfaceManager
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// and was created by calling CInterfaceManager::addLink, contains the name of this link
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std::string LinkName;
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#endif
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public:
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struct CTargetInfo
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{
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CInterfaceElement *Elem;
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std::string PropertyName;
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/** Affect a value to this target.
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* \return true if the affectation could be made
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*/
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bool affect(const CInterfaceExprValue &value);
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};
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public:
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CInterfaceLink();
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~CInterfaceLink(); // this object should only be destroyed by a CInterfaceElement
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/** Make a link between the given interface element properties and a value that depends on database entries.
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* The link is automatically added in the link list of the targets element (it calls CInterfaceElement::addLink), so when all target elements are removed, the link is.
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* If there are no target element, the link is permanent (removed at exit)
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* NB : The target is not updated during this call.
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*/
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bool init(const std::vector<CTargetInfo> &targets, const std::string &expr, const std::string &actionHandler, const std::string &ahParams, const std::string &ahCond, CInterfaceGroup *parent);
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// force all the links that have been created to update their targets. This can be called when the interface has been loaded, and when the databse entries have been retrieved.
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static void updateAllLinks();
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// force all trigered links to be updated
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static void updateTrigeredLinks();
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// remove from the _LinksWithNoTarget list if the link has no target
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void uninit();
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// Force an update of the target of this link
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void update();
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/** Remove a target element. It won't be updated anymore by that link
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* NB : this don't call removeLink() on the target
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*/
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void removeTarget(CInterfaceElement *elem);
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// Get the number of targets of this link
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uint getNumTargets() const { return (uint)_Targets.size(); }
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// Get the i-th target
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CInterfaceElement *getTarget(uint index) const { return _Targets[index]._InterfaceElement; }
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static void removeAllLinks();
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static void setTargetProperty (const std::string & Target, const CInterfaceExprValue &val);
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static bool isUpdatingAllLinks() { return _UpdateAllLinks; }
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////////////////////////////////////////////////////////////////////////////////////////////////////////
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private:
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friend struct CRemoveTargetPred;
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// a target property
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struct CTarget
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{
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CInterfaceElement *_InterfaceElement;
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const CReflectedProperty *_Property;
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};
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private:
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typedef std::list<CInterfaceLink *> TLinkList;
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typedef NLMISC::CSmartPtr<CInterfaceLink> TLinkSmartPtr;
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typedef std::vector<TLinkSmartPtr> TLinkVect;
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typedef std::vector<ICDBNode *> TNodeVect;
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private:
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std::vector<CTarget> _Targets;
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TNodeVect _ObservedNodes;
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std::string _Expr;
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CInterfaceExprNode *_ParseTree;
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std::string _ActionHandler;
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std::string _AHParams;
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std::string _AHCond;
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CInterfaceGroup *_AHParent;
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static TLinkList _LinkList;
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TLinkList::iterator _ListEntry;
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bool _On;
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static TLinkVect _LinksWithNoTarget; // there should be an owner for links with no targets
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static bool _UpdateAllLinks;
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///\ name triggered link mgt
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//@{
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// next/previous link that was trigered. NULL means end or start of list
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// each ptr is duplicated because with manage 2 lists : one list in which links are added, and one list in which we update links.
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// This way one link can trigger another with no prb
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CInterfaceLink *_PrevTriggeredLink[2];
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CInterfaceLink *_NextTriggeredLink[2];
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bool _Triggered[2];
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// global lists
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static CInterfaceLink *_FirstTriggeredLink[2];
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static CInterfaceLink *_LastTriggeredLink[2];
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// iterators in current list being updated : they're global so that deleting a CInterfaceLink instance prevent them from becoming dangling pointers
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static CInterfaceLink *_CurrUpdatedLink;
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static CInterfaceLink *_NextUpdatedLink;
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// Index of the list in which triggered link must be inserted
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static uint _CurrentTriggeredLinkList;
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//
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void linkInTriggerList(uint list);
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void unlinkFromTriggerList(uint list);
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//@}
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private:
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/** Inherited from ICDBNode::IPropertyObserver
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* This doesn't update the node directly, but mark it as 'triggered'
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* The node is really updated during the call to 'updateTrigeredLinks()'
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*/
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virtual void update(ICDBNode *node);
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void createObservers(const TNodeVect &nodes);
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void removeObservers(const TNodeVect &nodes);
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// debug : check that there are as many targets as reference to a link
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void checkNbRefs();
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};
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#endif
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