76e7770bc9
The `pre` handler is called after blender internal code is done populating the link/append context with data to be processed, and before this data starts being linked from library files. The `post` handler is called after blender is done linking, and potentailly appending and/or instantiating, the requested data and all of their dependencies. Both handlers are called with a single argument, the link/append context. An new RNA sets of wrappers have been added to expose relevant info from these internal C++ structures. NOTE: !113658 is very similar (but tied to asset drag & drop), whereas this PR is more general (these could probably live hand-in-hand / side- by-side). Implements #122357 Pull Request: https://projects.blender.org/blender/blender/pulls/128279 ----------------- Some quick py example code: ```python import bpy def my_handler_pre(lapp_context): print("About to {}:\n\t".format("link" if "LINK" in lapp_context.options else "append"), "\n\t".join("{} '{}', from libs ['{}']".format(item.id_type, item.name, "', '".join([l.filepath for l in item.source_libraries])) for item in lapp_context.import_items)) def my_handler_post(lapp_context): print("{}:\n\t".format("Linked" if "LINK" in lapp_context.options else "Appended"), "\n\t".join("{} '{}', from lib '{}'".format(item.id.id_type, item.id.name, item.source_library.filepath) for item in lapp_context.import_items)) bpy.app.handlers.link_append_pre.append(my_handler_pre) bpy.app.handlers.link_append_post.append(my_handler_post) ```
138 lines
4.3 KiB
C++
138 lines
4.3 KiB
C++
/* SPDX-FileCopyrightText: 2023 Blender Authors
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*
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* SPDX-License-Identifier: GPL-2.0-or-later */
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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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struct Depsgraph;
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struct ID;
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struct Main;
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struct PointerRNA;
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/**
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* Callbacks for One Off Actions
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* =============================
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*
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* - `{ACTION}` use in cases where only a single callback is required,
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* `VERSION_UPDATE` and `RENDER_STATS` for example.
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*
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* \note avoid single callbacks if there is a chance `PRE/POST` are useful to differentiate
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* since renaming callbacks may break Python scripts.
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*
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* Callbacks for Common Actions
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* ============================
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*
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* - `{ACTION}_PRE` run before the action.
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* - `{ACTION}_POST` run after the action.
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*
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* Optional Additional Callbacks
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* -----------------------------
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*
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* - `{ACTION}_INIT` when the handler may manipulate the context used to run the action.
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*
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* Examples where `INIT` functions may be useful are:
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*
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* - When rendering, an `INIT` function may change the camera or render settings,
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* things which a `PRE` function can't support as this information has already been used.
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* - When saving an `INIT` function could temporarily change the preferences.
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*
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* - `{ACTION}_POST_FAIL` should be included if the action may fail.
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*
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* Use this so a call to the `PRE` callback always has a matching call to `POST` or `POST_FAIL`.
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*
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* \note in most cases only `PRE/POST` are required.
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*
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* Callbacks for Background/Modal Tasks
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* ====================================
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*
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* - `{ACTION}_INIT`
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* - `{ACTION}_COMPLETE` when a background job has finished.
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* - `{ACTION}_CANCEL` When a background job is canceled partway through.
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*
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* While cancellation may be caused by any number of reasons, common causes may include:
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*
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* - Explicit user cancellation.
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* - Exiting Blender.
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* - Failure to acquire resources (such as disk-full, out of memory ... etc).
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*
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* \note `PRE/POST` handlers may be used along side modal task handlers
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* as is the case for rendering, where rendering an animation uses modal task handlers,
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* rendering a single frame has `PRE/POST` handlers.
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*
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* Python Access
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* =============
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*
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* All callbacks here must be exposed via the Python module `bpy.app.handlers`,
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* see `bpy_app_handlers.cc`.
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*/
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enum eCbEvent {
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BKE_CB_EVT_FRAME_CHANGE_PRE,
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BKE_CB_EVT_FRAME_CHANGE_POST,
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BKE_CB_EVT_RENDER_PRE,
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BKE_CB_EVT_RENDER_POST,
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BKE_CB_EVT_RENDER_WRITE,
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BKE_CB_EVT_RENDER_STATS,
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BKE_CB_EVT_RENDER_INIT,
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BKE_CB_EVT_RENDER_COMPLETE,
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BKE_CB_EVT_RENDER_CANCEL,
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BKE_CB_EVT_LOAD_PRE,
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BKE_CB_EVT_LOAD_POST,
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BKE_CB_EVT_LOAD_POST_FAIL,
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BKE_CB_EVT_SAVE_PRE,
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BKE_CB_EVT_SAVE_POST,
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BKE_CB_EVT_SAVE_POST_FAIL,
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BKE_CB_EVT_UNDO_PRE,
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BKE_CB_EVT_UNDO_POST,
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BKE_CB_EVT_REDO_PRE,
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BKE_CB_EVT_REDO_POST,
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BKE_CB_EVT_DEPSGRAPH_UPDATE_PRE,
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BKE_CB_EVT_DEPSGRAPH_UPDATE_POST,
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BKE_CB_EVT_VERSION_UPDATE,
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BKE_CB_EVT_LOAD_FACTORY_USERDEF_POST,
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BKE_CB_EVT_LOAD_FACTORY_STARTUP_POST,
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BKE_CB_EVT_XR_SESSION_START_PRE,
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BKE_CB_EVT_ANNOTATION_PRE,
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BKE_CB_EVT_ANNOTATION_POST,
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BKE_CB_EVT_OBJECT_BAKE_PRE,
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BKE_CB_EVT_OBJECT_BAKE_COMPLETE,
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BKE_CB_EVT_OBJECT_BAKE_CANCEL,
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BKE_CB_EVT_COMPOSITE_PRE,
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BKE_CB_EVT_COMPOSITE_POST,
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BKE_CB_EVT_COMPOSITE_CANCEL,
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BKE_CB_EVT_ANIMATION_PLAYBACK_PRE,
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BKE_CB_EVT_ANIMATION_PLAYBACK_POST,
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BKE_CB_EVT_TRANSLATION_UPDATE_POST,
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BKE_CB_EVT_EXTENSION_REPOS_UPDATE_PRE,
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BKE_CB_EVT_EXTENSION_REPOS_UPDATE_POST,
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BKE_CB_EVT_EXTENSION_REPOS_SYNC,
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BKE_CB_EVT_EXTENSION_REPOS_FILES_CLEAR,
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BKE_CB_EVT_BLENDIMPORT_PRE,
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BKE_CB_EVT_BLENDIMPORT_POST,
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BKE_CB_EVT_TOT,
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};
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struct bCallbackFuncStore {
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bCallbackFuncStore *next, *prev;
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void (*func)(Main *, PointerRNA **, int num_pointers, void *arg);
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void *arg;
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short alloc;
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};
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void BKE_callback_exec(Main *bmain, PointerRNA **pointers, int num_pointers, eCbEvent evt);
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void BKE_callback_exec_null(Main *bmain, eCbEvent evt);
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void BKE_callback_exec_id(Main *bmain, ID *id, eCbEvent evt);
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void BKE_callback_exec_id_depsgraph(Main *bmain, ID *id, Depsgraph *depsgraph, eCbEvent evt);
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void BKE_callback_exec_string(Main *bmain, eCbEvent evt, const char *str);
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void BKE_callback_add(bCallbackFuncStore *funcstore, eCbEvent evt);
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void BKE_callback_remove(bCallbackFuncStore *funcstore, eCbEvent evt);
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void BKE_callback_global_init();
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/**
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* Call on application exit.
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*/
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void BKE_callback_global_finalize();
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