94 lines
3.1 KiB
C++
94 lines
3.1 KiB
C++
/*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the 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 General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*/
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/** \file
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* \ingroup bke
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*/
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#pragma once
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#ifndef __cplusplus
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# error This is a C++-only header file.
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#endif
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#include "BKE_asset_library.hh"
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#include "BLI_map.hh"
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#include <memory>
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namespace blender::bke {
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/**
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* Global singleton-ish that provides access to individual #AssetLibrary instances.
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*
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* Whenever a blend file is loaded, the existing instance of AssetLibraryService is destructed, and
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* a new one is created -- hence the "singleton-ish". This ensures only information about relevant
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* asset libraries is loaded.
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*
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* \note How Asset libraries are identified may change in the future.
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* For now they are assumed to be:
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* - on disk (identified by the absolute directory), or
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* - the "current file" library (which is in memory but could have catalogs
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* loaded from a file on disk).
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*/
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class AssetLibraryService {
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public:
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using AssetLibraryPtr = std::unique_ptr<AssetLibrary>;
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AssetLibraryService() = default;
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~AssetLibraryService() = default;
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/** Return the AssetLibraryService singleton, allocating it if necessary. */
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static AssetLibraryService *get();
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/** Destroy the AssetLibraryService singleton. It will be reallocated by #get() if necessary. */
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static void destroy();
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/**
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* Get the given asset library. Opens it (i.e. creates a new AssetLibrary instance) if necessary.
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*/
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AssetLibrary *get_asset_library_on_disk(StringRefNull top_level_directory);
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/** Get the "Current File" asset library. */
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AssetLibrary *get_asset_library_current_file();
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/** Returns whether there are any known asset libraries with unsaved catalog edits. */
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bool has_any_unsaved_catalogs() const;
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protected:
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static std::unique_ptr<AssetLibraryService> instance_;
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/* Mapping absolute path of the library's top-level directory to the AssetLibrary instance. */
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Map<std::string, AssetLibraryPtr> on_disk_libraries_;
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AssetLibraryPtr current_file_library_;
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/* Handlers for managing the life cycle of the AssetLibraryService instance. */
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bCallbackFuncStore on_load_callback_store_;
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static bool atexit_handler_registered_;
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/** Allocate a new instance of the service and assign it to `instance_`. */
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static void allocate_service_instance();
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/**
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* Ensure the AssetLibraryService instance is destroyed before a new blend file is loaded.
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* This makes memory management simple, and ensures a fresh start for every blend file. */
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void app_handler_register();
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void app_handler_unregister();
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};
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} // namespace blender::bke
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