/** * @file lluictrlfactory.h * @brief Factory class for creating UI controls * * $LicenseInfo:firstyear=2003&license=viewerlgpl$ * Second Life Viewer Source Code * Copyright (C) 2010, Linden Research, Inc. * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; * version 2.1 of the License only. * * This library is 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 * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with this library; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA * * Linden Research, Inc., 945 Battery Street, San Francisco, CA 94111 USA * $/LicenseInfo$ */ #ifndef LLUICTRLFACTORY_H #define LLUICTRLFACTORY_H #include "llfasttimer.h" #include "llinitparam.h" #include "llregistry.h" #include "llxuiparser.h" #include "llstl.h" #include "lldir.h" #include "llsingleton.h" #include "llheteromap.h" class LLView; void deleteView(LLView*); // Inside LLView.cpp, avoid having to potentially delete an incomplete type here. // lookup widget constructor funcs by widget name template <typename DERIVED_TYPE> class LLChildRegistry : public LLRegistrySingleton<std::string, LLWidgetCreatorFunc, DERIVED_TYPE> { public: typedef LLRegistrySingleton<std::string, LLWidgetCreatorFunc, DERIVED_TYPE> super_t; // local static instance for registering a particular widget template<typename T> class Register : public super_t::StaticRegistrar { public: // register with either the provided builder, or the generic templated builder Register(const char* tag, LLWidgetCreatorFunc func = NULL); }; protected: LLChildRegistry() {} }; class LLDefaultChildRegistry : public LLChildRegistry<LLDefaultChildRegistry> { LLSINGLETON_EMPTY_CTOR(LLDefaultChildRegistry); }; // lookup widget name by type class LLWidgetNameRegistry : public LLRegistrySingleton<const std::type_info*, std::string, LLWidgetNameRegistry> { LLSINGLETON_EMPTY_CTOR(LLWidgetNameRegistry); }; // lookup function for generating empty param block by widget type // this is used for schema generation //typedef const LLInitParam::BaseBlock& (*empty_param_block_func_t)(); //class LLDefaultParamBlockRegistry //: public LLRegistrySingleton<const std::type_info*, empty_param_block_func_t, LLDefaultParamBlockRegistry> //{ // LLSINGLETON(LLDefaultParamBlockRegistry); //}; // Build time optimization, generate this once in .cpp file #ifndef LLUICTRLFACTORY_CPP extern template class LLUICtrlFactory* LLSingleton<class LLUICtrlFactory>::getInstance(); #endif class LLUICtrlFactory : public LLSingleton<LLUICtrlFactory> { LLSINGLETON(LLUICtrlFactory); ~LLUICtrlFactory(); // only partial specialization allowed in inner classes, so use extra dummy parameter template <typename PARAM_BLOCK, int DUMMY> class ParamDefaults { public: ParamDefaults(); const PARAM_BLOCK& get() { return mPrototype; } private: PARAM_BLOCK mPrototype; }; // base case for recursion, there are NO base classes of LLInitParam::BaseBlock template<int DUMMY> class ParamDefaults<LLInitParam::BaseBlock, DUMMY> { public: ParamDefaults(); const LLInitParam::BaseBlock& get() { return mBaseBlock; } private: LLInitParam::BaseBlock mBaseBlock; }; public: // get default parameter block for widget of a specific type template<typename T> static const typename T::Params& getDefaultParams() { return instance().mParamDefaultsMap.obtain< ParamDefaults<typename T::Params, 0> >().get(); } // Does what you want for LLFloaters and LLPanels // Returns 0 on success S32 saveToXML(LLView* viewp, const std::string& filename); // filename tracking for debugging info std::string getCurFileName(); void pushFileName(const std::string& name); void popFileName(); template<typename T> static T* create(typename T::Params& params, LLView* parent = NULL) { params.fillFrom(instance().mParamDefaultsMap.obtain< ParamDefaults<typename T::Params, 0> >().get()); T* widget = createWidgetImpl<T>(params, parent); if (widget) { widget->postBuild(); } return widget; } LLView* createFromXML(LLXMLNodePtr node, LLView* parent, const std::string& filename, const widget_registry_t&, LLXMLNodePtr output_node ); template<typename T> static T* createFromFile(const std::string &filename, LLView *parent, const widget_registry_t& registry) { T* widget = NULL; instance().pushFileName(filename); { LLXMLNodePtr root_node; if (!LLUICtrlFactory::getLayeredXMLNode(filename, root_node)) { LL_WARNS() << "Couldn't parse XUI from path: " << instance().getCurFileName() << ", from filename: " << filename << LL_ENDL; goto fail; } LLView* view = getInstance()->createFromXML(root_node, parent, filename, registry, NULL); if (view) { widget = dynamic_cast<T*>(view); // not of right type, so delete it if (!widget) { LL_WARNS() << "Widget in " << filename << " was of type " << typeid(view).name() << " instead of expected type " << typeid(T).name() << LL_ENDL; deleteView(view); view = NULL; } } } fail: instance().popFileName(); return widget; } template<class T> static T* getDefaultWidget(const std::string& name) { typename T::Params widget_params; widget_params.name = name; return create<T>(widget_params); } static void createChildren(LLView* viewp, LLXMLNodePtr node, const widget_registry_t&, LLXMLNodePtr output_node = NULL); static bool getLayeredXMLNode(const std::string &filename, LLXMLNodePtr& root, LLDir::ESkinConstraint constraint=LLDir::CURRENT_SKIN); private: //NOTE: both friend declarations are necessary to keep both gcc and msvc happy template <typename T> friend class LLChildRegistry; template <typename T> template <typename U> friend class LLChildRegistry<T>::Register; static void copyName(LLXMLNodePtr src, LLXMLNodePtr dest); // helper function for adding widget type info to various registries static void registerWidget(const std::type_info* widget_type, const std::type_info* param_block_type, const std::string& tag); static void loadWidgetTemplate(const std::string& widget_tag, LLInitParam::BaseBlock& block); template<typename T> static T* createWidgetImpl(const typename T::Params& params, LLView* parent = NULL) { LL_PROFILE_ZONE_SCOPED_CATEGORY_UI; T* widget = NULL; if (!params.validateBlock()) { LL_WARNS() << getInstance()->getCurFileName() << ": Invalid parameter block for " << typeid(T).name() << LL_ENDL; //return NULL; } widget = new T(params); widget->initFromParams(params); if (parent) { S32 tab_group = params.tab_group.isProvided() ? params.tab_group() : S32_MAX; setCtrlParent(widget, parent, tab_group); } return widget; } template<typename T> static T* defaultBuilder(LLXMLNodePtr node, LLView *parent, LLXMLNodePtr output_node) { LL_PROFILE_ZONE_SCOPED_CATEGORY_UI; typename T::Params params(getDefaultParams<T>()); LLXUIParser parser; parser.readXUI(node, params, LLUICtrlFactory::getInstance()->getCurFileName()); if (output_node) { // We always want to output top-left coordinates typename T::Params output_params(params); T::setupParamsForExport(output_params, parent); copyName(node, output_node); parser.writeXUI(output_node, output_params, LLInitParam::default_parse_rules(), &getDefaultParams<T>()); } // Apply layout transformations, usually munging rect params.from_xui = true; T::applyXUILayout(params, parent); T* widget = createWidgetImpl<T>(params, parent); typedef typename T::child_registry_t registry_t; createChildren(widget, node, registry_t::instance(), output_node); if (widget && !widget->postBuild()) { delete widget; widget = NULL; } return widget; } // this exists to get around dependency on llview static void setCtrlParent(LLView* view, LLView* parent, S32 tab_group); class LLPanel* mDummyPanel; std::vector<std::string> mFileNames; // store ParamDefaults specializations // Each ParamDefaults specialization used to be an LLSingleton in its own // right. But the 2016 changes to the LLSingleton mechanism, making // LLSingleton instances polymorphic, are incompatible with current // LLInitParam::BaseBlock functionality. (Thanks NickyD for spotting // that!) Moreover, instances of the private nested ParamDefaults template // aren't global resources -- which is what LLSingleton is designed for. // This is simply a cache looked up by type. Its lifespan is tied to // LLUICtrlFactory. Use LLHeteroMap for this cache. LLHeteroMap mParamDefaultsMap; }; template <typename PARAM_BLOCK, int DUMMY> LLUICtrlFactory::ParamDefaults<PARAM_BLOCK, DUMMY>::ParamDefaults() { // look up template file for this param block... const std::string* param_block_tag = LLWidgetNameRegistry::instance().getValue(&typeid(PARAM_BLOCK)); if (param_block_tag) { // ...and if it exists, back fill values using the most specific template first PARAM_BLOCK params; LLUICtrlFactory::loadWidgetTemplate(*param_block_tag, params); mPrototype.fillFrom(params); } // recursively fill from base class param block ((typename PARAM_BLOCK::base_block_t&)mPrototype).fillFrom( LLUICtrlFactory::instance().mParamDefaultsMap.obtain< ParamDefaults<typename PARAM_BLOCK::base_block_t, DUMMY> >().get()); } template <int DUMMY> LLUICtrlFactory::ParamDefaults<LLInitParam::BaseBlock, DUMMY>::ParamDefaults() {} // this is here to make gcc happy with reference to LLUICtrlFactory template<typename DERIVED> template<typename T> LLChildRegistry<DERIVED>::Register<T>::Register(const char* tag, LLWidgetCreatorFunc func) : LLChildRegistry<DERIVED>::StaticRegistrar(tag, func.empty() ? (LLWidgetCreatorFunc)&LLUICtrlFactory::defaultBuilder<T> : func) { // add this widget to various registries LLUICtrlFactory::instance().registerWidget(&typeid(T), &typeid(typename T::Params), tag); // since registry_t depends on T, do this in line here // TODO: uncomment this for schema generation //typedef typename T::child_registry_t registry_t; //LLChildRegistryRegistry::instance().defaultRegistrar().add(&typeid(T), registry_t::instance()); } #endif //LLUICTRLFACTORY_H