Assets: Add an active asset library per workspace, for the UI to use

This per-workspace active asset library will be used by the asset views
later. Note that Asset Browsers have their own active asset library,
overriding the one from the workspace.

As part of this the `FileSelectAssetLibraryUID` type gets replaced by
`AssetLibraryReference` which is on the asset level now, not the
File/Asset Browser level. But some more work is needed to complete that,
which is better done in a separate commit.
This also moves the asset library from/to enum-value logic from RNA to
the editor asset level, which will later be used by the asset view.

20 files changed, 284 insertions, 39 deletions

diff --git a/source/blender/blenkernel/BKE_asset.h b/source/blender/blenkernel/BKE_asset.h
index d1f543b1f38..50eb2859279 100644
--- a/source/blender/blenkernel/BKE_asset.h
+++ b/source/blender/blenkernel/BKE_asset.h
@@ -26,6 +26,7 @@
 extern "C" {
 #endif
 
+struct AssetLibraryReference;
 struct BlendDataReader;
 struct BlendWriter;
 struct ID;
@@ -45,6 +46,8 @@ struct AssetTagEnsureResult BKE_asset_metadata_tag_ensure(struct AssetMetaData *
                                                           const char *name);
 void BKE_asset_metadata_tag_remove(struct AssetMetaData *asset_data, struct AssetTag *tag);
 
+void BKE_asset_library_reference_init_default(struct AssetLibraryReference *library_ref);
+
 struct PreviewImage *BKE_asset_metadata_preview_get_from_id(const struct AssetMetaData *asset_data,
                                                             const struct ID *owner_id);
 
diff --git a/source/blender/blenkernel/intern/asset.cc b/source/blender/blenkernel/intern/asset.cc
index b5a7f5e37a6..f74018b20c5 100644
--- a/source/blender/blenkernel/intern/asset.cc
+++ b/source/blender/blenkernel/intern/asset.cc
@@ -110,6 +110,11 @@ void BKE_asset_metadata_tag_remove(AssetMetaData *asset_data, AssetTag *tag)
   BLI_assert(BLI_listbase_count(&asset_data->tags) == asset_data->tot_tags);
 }
 
+void BKE_asset_library_reference_init_default(AssetLibraryReference *library_ref)
+{
+  memcpy(library_ref, DNA_struct_default_get(AssetLibraryReference), sizeof(*library_ref));
+}
+
 /* Queries -------------------------------------------- */
 
 PreviewImage *BKE_asset_metadata_preview_get_from_id(const AssetMetaData *UNUSED(asset_data),
diff --git a/source/blender/blenkernel/intern/workspace.c b/source/blender/blenkernel/intern/workspace.c
index 533107b2bf6..5cac149c503 100644
--- a/source/blender/blenkernel/intern/workspace.c
+++ b/source/blender/blenkernel/intern/workspace.c
@@ -29,6 +29,7 @@
 
 #include "BLT_translation.h"
 
+#include "BKE_asset.h"
 #include "BKE_global.h"
 #include "BKE_idprop.h"
 #include "BKE_idtype.h"
@@ -53,6 +54,13 @@
 
 /* -------------------------------------------------------------------- */
 
+static void workspace_init_data(ID *id)
+{
+  WorkSpace *workspace = (WorkSpace *)id;
+
+  BKE_asset_library_reference_init_default(&workspace->active_asset_library);
+}
+
 static void workspace_free_data(ID *id)
 {
   WorkSpace *workspace = (WorkSpace *)id;
@@ -180,7 +188,7 @@ IDTypeInfo IDType_ID_WS = {
     .translation_context = BLT_I18NCONTEXT_ID_WORKSPACE,
     .flags = IDTYPE_FLAGS_NO_COPY | IDTYPE_FLAGS_NO_MAKELOCAL | IDTYPE_FLAGS_NO_ANIMDATA,
 
-    .init_data = NULL,
+    .init_data = workspace_init_data,
     .copy_data = NULL,
     .free_data = workspace_free_data,
     .make_local = NULL,
diff --git a/source/blender/blenloader/intern/versioning_300.c b/source/blender/blenloader/intern/versioning_300.c
index 3c58c29c162..d36c622c572 100644
--- a/source/blender/blenloader/intern/versioning_300.c
+++ b/source/blender/blenloader/intern/versioning_300.c
@@ -33,9 +33,11 @@
 #include "DNA_listBase.h"
 #include "DNA_modifier_types.h"
 #include "DNA_text_types.h"
+#include "DNA_workspace_types.h"
 
 #include "BKE_action.h"
 #include "BKE_animsys.h"
+#include "BKE_asset.h"
 #include "BKE_collection.h"
 #include "BKE_deform.h"
 #include "BKE_fcurve_driver.h"
@@ -517,6 +519,15 @@ void blo_do_versions_300(FileData *fd, Library *UNUSED(lib), Main *bmain)
       }
     }
     FOREACH_NODETREE_END;
+
+    {
+      if (!DNA_struct_elem_find(
+              fd->filesdna, "WorkSpace", "AssetLibraryReference", "active_asset_library")) {
+        LISTBASE_FOREACH (WorkSpace *, workspace, &bmain->workspaces) {
+          BKE_asset_library_reference_init_default(&workspace->active_asset_library);
+        }
+      }
+    }
   }
 
   if (!MAIN_VERSION_ATLEAST(bmain, 300, 10)) {
diff --git a/source/blender/editors/asset/CMakeLists.txt b/source/blender/editors/asset/CMakeLists.txt
index 8c5f91561b7..794e64fa420 100644
--- a/source/blender/editors/asset/CMakeLists.txt
+++ b/source/blender/editors/asset/CMakeLists.txt
@@ -19,6 +19,7 @@ set(INC
     ../include
     ../../blenkernel
     ../../blenlib
+    ../../blenloader
     ../../makesdna
     ../../makesrna
     ../../windowmanager
@@ -34,6 +35,7 @@ set(SRC
 )
 
 set(LIB
+  bf_blenloader
 )
 
 blender_add_lib(bf_editor_asset "${SRC}" "${INC}" "${INC_SYS}" "${LIB}")
diff --git a/source/blender/editors/asset/asset_edit.cc b/source/blender/editors/asset/asset_edit.cc
index d20de4141cb..5ae07a54b11 100644
--- a/source/blender/editors/asset/asset_edit.cc
+++ b/source/blender/editors/asset/asset_edit.cc
@@ -65,3 +65,56 @@ bool ED_asset_can_make_single_from_context(const bContext *C)
   /* Context needs a "id" pointer to be set for #ASSET_OT_mark()/#ASSET_OT_clear() to use. */
   return CTX_data_pointer_get_type_silent(C, "id", &RNA_ID).data != nullptr;
 }
+
+/* TODO better place? */
+/* TODO What about the setter and the itemf? */
+#include "BKE_preferences.h"
+#include "DNA_asset_types.h"
+#include "DNA_userdef_types.h"
+int ED_asset_library_reference_to_enum_value(const AssetLibraryReference *library)
+{
+  /* Simple case: Predefined repo, just set the value. */
+  if (library->type < ASSET_LIBRARY_CUSTOM) {
+    return library->type;
+  }
+
+  /* Note that the path isn't checked for validity here. If an invalid library path is used, the
+   * Asset Browser can give a nice hint on what's wrong. */
+  const bUserAssetLibrary *user_library = BKE_preferences_asset_library_find_from_index(
+      &U, library->custom_library_index);
+  if (user_library) {
+    return ASSET_LIBRARY_CUSTOM + library->custom_library_index;
+  }
+
+  BLI_assert(0);
+  return ASSET_LIBRARY_LOCAL;
+}
+
+AssetLibraryReference ED_asset_library_reference_from_enum_value(int value)
+{
+  AssetLibraryReference library;
+
+  /* Simple case: Predefined repo, just set the value. */
+  if (value < ASSET_LIBRARY_CUSTOM) {
+    library.type = value;
+    library.custom_library_index = -1;
+    BLI_assert(ELEM(value, ASSET_LIBRARY_LOCAL));
+    return library;
+  }
+
+  const bUserAssetLibrary *user_library = BKE_preferences_asset_library_find_from_index(
+      &U, value - ASSET_LIBRARY_CUSTOM);
+
+  /* Note that the path isn't checked for validity here. If an invalid library path is used, the
+   * Asset Browser can give a nice hint on what's wrong. */
+  const bool is_valid = (user_library->name[0] && user_library->path[0]);
+  if (!user_library) {
+    library.type = ASSET_LIBRARY_LOCAL;
+    library.custom_library_index = -1;
+  }
+  else if (user_library && is_valid) {
+    library.custom_library_index = value - ASSET_LIBRARY_CUSTOM;
+    library.type = ASSET_LIBRARY_CUSTOM;
+  }
+  return library;
+}
diff --git a/source/blender/editors/include/ED_asset.h b/source/blender/editors/include/ED_asset.h
index dd505167fe5..a2ef0755fbd 100644
--- a/source/blender/editors/include/ED_asset.h
+++ b/source/blender/editors/include/ED_asset.h
@@ -24,11 +24,17 @@
 extern "C" {
 #endif
 
+struct AssetLibraryReference;
+struct bContext;
+
 bool ED_asset_mark_id(const struct bContext *C, struct ID *id);
 bool ED_asset_clear_id(struct ID *id);
 
 bool ED_asset_can_make_single_from_context(const struct bContext *C);
 
+int ED_asset_library_reference_to_enum_value(const struct AssetLibraryReference *library);
+struct AssetLibraryReference ED_asset_library_reference_from_enum_value(int value);
+
 void ED_operatortypes_asset(void);
 
 #ifdef __cplusplus
diff --git a/source/blender/editors/space_file/file_draw.c b/source/blender/editors/space_file/file_draw.c
index faa4b3cc9cc..a314a85491d 100644
--- a/source/blender/editors/space_file/file_draw.c
+++ b/source/blender/editors/space_file/file_draw.c
@@ -1105,7 +1105,7 @@ bool file_draw_hint_if_invalid(const SpaceFile *sfile, const ARegion *region)
     return false;
   }
   /* Check if the library exists. */
-  if ((asset_params->asset_library.type == FILE_ASSET_LIBRARY_LOCAL) ||
+  if ((asset_params->asset_library.type == ASSET_LIBRARY_LOCAL) ||
       filelist_is_dir(sfile->files, asset_params->base_params.dir)) {
     return false;
   }
diff --git a/source/blender/editors/space_file/filelist.c b/source/blender/editors/space_file/filelist.c
index 0e15538e03b..c4b895dc54d 100644
--- a/source/blender/editors/space_file/filelist.c
+++ b/source/blender/editors/space_file/filelist.c
@@ -1050,7 +1050,7 @@ static bool filelist_compare_asset_libraries(const FileSelectAssetLibraryUID *li
   if (library_a->type != library_b->type) {
     return false;
   }
-  if (library_a->type == FILE_ASSET_LIBRARY_CUSTOM) {
+  if (library_a->type == ASSET_LIBRARY_CUSTOM) {
     /* Don't only check the index, also check that it's valid. */
     bUserAssetLibrary *library_ptr_a = BKE_preferences_asset_library_find_from_index(
         &U, library_a->custom_library_index);
diff --git a/source/blender/editors/space_file/filesel.c b/source/blender/editors/space_file/filesel.c
index 7ab93df81d2..7bc83e8fc79 100644
--- a/source/blender/editors/space_file/filesel.c
+++ b/source/blender/editors/space_file/filesel.c
@@ -118,7 +118,7 @@ static void fileselect_ensure_updated_asset_params(SpaceFile *sfile)
     asset_params = sfile->asset_params = MEM_callocN(sizeof(*asset_params),
                                                      "FileAssetSelectParams");
     asset_params->base_params.details_flags = U_default.file_space_data.details_flags;
-    asset_params->asset_library.type = FILE_ASSET_LIBRARY_LOCAL;
+    asset_params->asset_library.type = ASSET_LIBRARY_LOCAL;
     asset_params->asset_library.custom_library_index = -1;
     asset_params->import_type = FILE_ASSET_IMPORT_APPEND;
   }
@@ -420,26 +420,26 @@ static void fileselect_refresh_asset_params(FileAssetSelectParams *asset_params)
   bUserAssetLibrary *user_library = NULL;
 
   /* Ensure valid repository, or fall-back to local one. */
-  if (library->type == FILE_ASSET_LIBRARY_CUSTOM) {
+  if (library->type == ASSET_LIBRARY_CUSTOM) {
     BLI_assert(library->custom_library_index >= 0);
 
     user_library = BKE_preferences_asset_library_find_from_index(&U,
                                                                  library->custom_library_index);
     if (!user_library) {
-      library->type = FILE_ASSET_LIBRARY_LOCAL;
+      library->type = ASSET_LIBRARY_LOCAL;
     }
   }
 
   switch (library->type) {
-    case FILE_ASSET_LIBRARY_LOCAL:
+    case ASSET_LIBRARY_LOCAL:
       base_params->dir[0] = '\0';
       break;
-    case FILE_ASSET_LIBRARY_CUSTOM:
+    case ASSET_LIBRARY_CUSTOM:
       BLI_assert(user_library);
       BLI_strncpy(base_params->dir, user_library->path, sizeof(base_params->dir));
       break;
   }
-  base_params->type = (library->type == FILE_ASSET_LIBRARY_LOCAL) ? FILE_MAIN_ASSET : FILE_LOADLIB;
+  base_params->type = (library->type == ASSET_LIBRARY_LOCAL) ? FILE_MAIN_ASSET : FILE_LOADLIB;
 }
 
 void fileselect_refresh_params(SpaceFile *sfile)
diff --git a/source/blender/makesdna/DNA_asset_defaults.h b/source/blender/makesdna/DNA_asset_defaults.h
index ff00ba79cf0..ce01563f619 100644
--- a/source/blender/makesdna/DNA_asset_defaults.h
+++ b/source/blender/makesdna/DNA_asset_defaults.h
@@ -32,6 +32,13 @@
     0 \
   }
 
+#define _DNA_DEFAULT_AssetLibraryReference \
+  { \
+    .type = ASSET_LIBRARY_LOCAL, \
+    /* Not needed really (should be ignored for #ASSET_LIBRARY_LOCAL), but helps debugging. */ \
+    .custom_library_index = -1, \
+  }
+
 /** \} */
 
 /* clang-format on */
diff --git a/source/blender/makesdna/DNA_asset_types.h b/source/blender/makesdna/DNA_asset_types.h
index 697d25653f8..5acdc4ee862 100644
--- a/source/blender/makesdna/DNA_asset_types.h
+++ b/source/blender/makesdna/DNA_asset_types.h
@@ -62,6 +62,41 @@ typedef struct AssetMetaData {
   char _pad[4];
 } AssetMetaData;
 
+typedef enum eAssetLibraryType {
+  /* For the future. Display assets bundled with Blender by default. */
+  // ASSET_LIBRARY_BUNDLED = 0,
+  /** Display assets from the current session (current "Main"). */
+  ASSET_LIBRARY_LOCAL = 1,
+  /* For the future. Display assets for the current project. */
+  // ASSET_LIBRARY_PROJECT = 2,
+
+  /** Display assets from custom asset libraries, as defined in the preferences
+   * (#bUserAssetLibrary). The name will be taken from #FileSelectParams.asset_library.idname
+   * then.
+   * In RNA, we add the index of the custom library to this to identify it by index. So keep
+   * this last! */
+  ASSET_LIBRARY_CUSTOM = 100,
+} eAssetLibraryType;
+
+/* TODO copy of FileSelectAssetLibraryUID */
+/**
+ * Information to identify a asset library. May be either one of the predefined types (current
+ * 'Main', builtin library, project library), or a custom type as defined in the Preferences.
+ *
+ * If the type is set to #ASSET_LIBRARY_CUSTOM, `custom_library_index` must be set to identify the
+ * custom library. Otherwise it is not used.
+ */
+typedef struct AssetLibraryReference {
+  short type; /* eAssetLibraryType */
+  char _pad1[2];
+  /**
+   * If showing a custom asset library (#ASSET_LIBRARY_CUSTOM), this is the index of the
+   * #bUserAssetLibrary within #UserDef.asset_libraries.
+   * Should be ignored otherwise (but better set to -1 then, for sanity and debugging).
+   */
+  int custom_library_index;
+} AssetLibraryReference;
+
 #ifdef __cplusplus
 }
 #endif
diff --git a/source/blender/makesdna/DNA_space_types.h b/source/blender/makesdna/DNA_space_types.h
index 73a44ec16bb..b990de29ff3 100644
--- a/source/blender/makesdna/DNA_space_types.h
+++ b/source/blender/makesdna/DNA_space_types.h
@@ -700,14 +700,14 @@ typedef enum eSpaceSeq_OverlayType {
  * Information to identify a asset library. May be either one of the predefined types (current
  * 'Main', builtin library, project library), or a custom type as defined in the Preferences.
  *
- * If the type is set to #FILE_ASSET_LIBRARY_CUSTOM, idname must have the name to identify the
+ * If the type is set to #ASSET_LIBRARY_CUSTOM, idname must have the name to identify the
  * custom library. Otherwise idname is not used.
  */
 typedef struct FileSelectAssetLibraryUID {
   short type; /* eFileAssetLibrary_Type */
   char _pad[2];
   /**
-   * If showing a custom asset library (#FILE_ASSET_LIBRARY_CUSTOM), this is the index of the
+   * If showing a custom asset library (#ASSET_LIBRARY_CUSTOM), this is the index of the
    * #bUserAssetLibrary within #UserDef.asset_libraries.
    * Should be ignored otherwise (but better set to -1 then, for sanity and debugging).
    */
@@ -885,22 +885,6 @@ typedef enum eFileBrowse_Mode {
   FILE_BROWSE_MODE_ASSETS = 1,
 } eFileBrowse_Mode;
 
-typedef enum eFileAssetLibrary_Type {
-  /* For the future. Display assets bundled with Blender by default. */
-  // FILE_ASSET_LIBRARY_BUNDLED = 0,
-  /** Display assets from the current session (current "Main"). */
-  FILE_ASSET_LIBRARY_LOCAL = 1,
-  /* For the future. Display assets for the current project. */
-  // FILE_ASSET_LIBRARY_PROJECT = 2,
-
-  /** Display assets from custom asset libraries, as defined in the preferences
-   * (#bUserAssetLibrary). The name will be taken from #FileSelectParams.asset_library.idname
-   * then.
-   * In RNA, we add the index of the custom library to this to identify it by index. So keep
-   * this last! */
-  FILE_ASSET_LIBRARY_CUSTOM = 100,
-} eFileAssetLibrary_Type;
-
 /* FileSelectParams.display */
 enum eFileDisplayType {
   /** Internal (not exposed to users): Keep whatever display type was used during the last File
diff --git a/source/blender/makesdna/DNA_workspace_types.h b/source/blender/makesdna/DNA_workspace_types.h
index 0fce331fadf..9ed01a7dbcc 100644
--- a/source/blender/makesdna/DNA_workspace_types.h
+++ b/source/blender/makesdna/DNA_workspace_types.h
@@ -23,6 +23,7 @@
 #pragma once
 
 #include "DNA_ID.h"
+#include "DNA_asset_types.h"
 
 #ifdef __cplusplus
 extern "C" {
@@ -135,6 +136,10 @@ typedef struct WorkSpace {
 
   /** Info text from modal operators (runtime). */
   char *status_text;
+
+  /** Workspace-wide active asset library, for asset UIs to use (e.g. asset view UI template). The
+   * Asset Browser has its own and doesn't use this. */
+  AssetLibraryReference active_asset_library;
 } WorkSpace;
 
 /**
diff --git a/source/blender/makesdna/intern/dna_defaults.c b/source/blender/makesdna/intern/dna_defaults.c
index 03f7dbf6489..a573e2f9e8c 100644
--- a/source/blender/makesdna/intern/dna_defaults.c
+++ b/source/blender/makesdna/intern/dna_defaults.c
@@ -152,6 +152,7 @@
 
 /* DNA_asset_defaults.h */
 SDNA_DEFAULT_DECL_STRUCT(AssetMetaData);
+SDNA_DEFAULT_DECL_STRUCT(AssetLibraryReference);
 
 /* DNA_armature_defaults.h */
 SDNA_DEFAULT_DECL_STRUCT(bArmature);
@@ -348,6 +349,7 @@ const void *DNA_default_table[SDNA_TYPE_MAX] = {
 
     /* DNA_asset_defaults.h */
     SDNA_DEFAULT_DECL(AssetMetaData),
+    SDNA_DEFAULT_DECL(AssetLibraryReference),
 
     /* DNA_armature_defaults.h */
     SDNA_DEFAULT_DECL(bArmature),
diff --git a/source/blender/makesrna/RNA_access.h b/source/blender/makesrna/RNA_access.h
index 299f96a4c46..52bf80ee45b 100644
--- a/source/blender/makesrna/RNA_access.h
+++ b/source/blender/makesrna/RNA_access.h
@@ -71,6 +71,7 @@ extern StructRNA RNA_ArrayGpencilModifier;
 extern StructRNA RNA_ArrayModifier;
 extern StructRNA RNA_Attribute;
 extern StructRNA RNA_AttributeGroup;
+extern StructRNA RNA_AssetLibraryReference;
 extern StructRNA RNA_AssetMetaData;
 extern StructRNA RNA_AssetTag;
 extern StructRNA RNA_BackgroundImage;
diff --git a/source/blender/makesrna/intern/rna_asset.c b/source/blender/makesrna/intern/rna_asset.c
index 55f680c736d..54cc87b4eea 100644
--- a/source/blender/makesrna/intern/rna_asset.c
+++ b/source/blender/makesrna/intern/rna_asset.c
@@ -35,6 +35,8 @@
 
 #  include "BLI_listbase.h"
 
+#  include "ED_asset.h"
+
 #  include "RNA_access.h"
 
 static AssetTag *rna_AssetMetaData_tag_new(AssetMetaData *asset_data,
@@ -123,6 +125,73 @@ static void rna_AssetMetaData_active_tag_range(
   *max = *softmax = MAX2(asset_data->tot_tags - 1, 0);
 }
 
+int rna_asset_library_reference_get(const AssetLibraryReference *library)
+{
+  return ED_asset_library_reference_to_enum_value(library);
+}
+
+void rna_asset_library_reference_set(AssetLibraryReference *library, int value)
+{
+  *library = ED_asset_library_reference_from_enum_value(value);
+}
+
+const EnumPropertyItem *rna_asset_library_reference_itemf(bContext *UNUSED(C),
+                                                          PointerRNA *UNUSED(ptr),
+                                                          PropertyRNA *UNUSED(prop),
+                                                          bool *r_free)
+{
+  const EnumPropertyItem predefined_items[] = {
+      /* For the future. */
+      // {ASSET_REPO_BUNDLED, "BUNDLED", 0, "Bundled", "Show the default user assets"},
+      {ASSET_LIBRARY_LOCAL,
+       "LOCAL",
+       ICON_BLENDER,
+       "Current File",
+       "Show the assets currently available in this Blender session"},
+      {0, NULL, 0, NULL, NULL},
+  };
+
+  EnumPropertyItem *item = NULL;
+  int totitem = 0;
+
+  /* Add separator if needed. */
+  if (!BLI_listbase_is_empty(&U.asset_libraries)) {
+    const EnumPropertyItem sepr = {0, "", 0, "Custom", NULL};
+    RNA_enum_item_add(&item, &totitem, &sepr);
+  }
+
+  int i = 0;
+  for (bUserAssetLibrary *user_library = U.asset_libraries.first; user_library;
+       user_library = user_library->next, i++) {
+    /* Note that the path itself isn't checked for validity here. If an invalid library path is
+     * used, the Asset Browser can give a nice hint on what's wrong. */
+    const bool is_valid = (user_library->name[0] && user_library->path[0]);
+    if (!is_valid) {
+      continue;
+    }
+
+    /* Use library path as description, it's a nice hint for users. */
+    EnumPropertyItem tmp = {ASSET_LIBRARY_CUSTOM + i,
+                            user_library->name,
+                            ICON_NONE,
+                            user_library->name,
+                            user_library->path};
+    RNA_enum_item_add(&item, &totitem, &tmp);
+  }
+
+  if (totitem) {
+    const EnumPropertyItem sepr = {0, "", 0, "Built-in", NULL};
+    RNA_enum_item_add(&item, &totitem, &sepr);
+  }
+
+  /* Add predefined items. */
+  RNA_enum_items_add(&item, &totitem, predefined_items);
+
+  RNA_enum_item_end(&item, &totitem);
+  *r_free = true;
+  return item;
+}
+
 #else
 
 static void rna_def_asset_tag(BlenderRNA *brna)
@@ -209,12 +278,34 @@ static void rna_def_asset_data(BlenderRNA *brna)
   RNA_def_property_ui_text(prop, "Active Tag", "Index of the tag set for editing");
 }
 
+static void rna_def_asset_library_reference(BlenderRNA *brna)
+{
+  StructRNA *srna = RNA_def_struct(brna, "AssetLibraryReference", NULL);
+  RNA_def_struct_ui_text(
+      srna, "Asset Library Reference", "Identifier to refere to the asset library");
+}
+
+/**
+ * \note the UI text and updating has to be set by the caller.
+ */
+PropertyRNA *rna_def_asset_library_reference_common(struct StructRNA *srna,
+                                                    const char *get,
+                                                    const char *set)
+{
+  PropertyRNA *prop = RNA_def_property(srna, "active_asset_library", PROP_ENUM, PROP_NONE);
+  RNA_def_property_enum_items(prop, DummyRNA_NULL_items);
+  RNA_def_property_enum_funcs(prop, get, set, "rna_asset_library_reference_itemf");
+
+  return prop;
+}
+
 void RNA_def_asset(BlenderRNA *brna)
 {
   RNA_define_animate_sdna(false);
 
   rna_def_asset_tag(brna);
   rna_def_asset_data(brna);
+  rna_def_asset_library_reference(brna);
 
   RNA_define_animate_sdna(true);
 }
diff --git a/source/blender/makesrna/intern/rna_internal.h b/source/blender/makesrna/intern/rna_internal.h
index f15368bcc77..9dc08430307 100644
--- a/source/blender/makesrna/intern/rna_internal.h
+++ b/source/blender/makesrna/intern/rna_internal.h
@@ -30,6 +30,7 @@
 
 #define RNA_MAGIC ((int)~0)
 
+struct AssetLibraryReference;
 struct FreestyleSettings;
 struct ID;
 struct IDOverrideLibrary;
@@ -266,6 +267,16 @@ void rna_def_mtex_common(struct BlenderRNA *brna,
 void rna_def_texpaint_slots(struct BlenderRNA *brna, struct StructRNA *srna);
 void rna_def_view_layer_common(struct BlenderRNA *brna, struct StructRNA *srna, const bool scene);
 
+PropertyRNA *rna_def_asset_library_reference_common(struct StructRNA *srna,
+                                                    const char *get,
+                                                    const char *set);
+int rna_asset_library_reference_get(const struct AssetLibraryReference *library);
+void rna_asset_library_reference_set(struct AssetLibraryReference *library, int value);
+const EnumPropertyItem *rna_asset_library_reference_itemf(struct bContext *C,
+                                                          struct PointerRNA *ptr,
+                                                          struct PropertyRNA *prop,
+                                                          bool *r_free);
+
 void rna_def_actionbone_group_common(struct StructRNA *srna,
                                      int update_flag,
                                      const char *update_cb);
diff --git a/source/blender/makesrna/intern/rna_space.c b/source/blender/makesrna/intern/rna_space.c
index 1d00c379b06..bcc6e54f4fd 100644
--- a/source/blender/makesrna/intern/rna_space.c
+++ b/source/blender/makesrna/intern/rna_space.c
@@ -2561,6 +2561,8 @@ static PointerRNA rna_FileSelectParams_filter_id_get(PointerRNA *ptr)
   return rna_pointer_inherit_refine(ptr, &RNA_FileSelectIDFilter, ptr->data);
 }
 
+/* TODO use rna_def_asset_library_reference_common() */
+
 static int rna_FileAssetSelectParams_asset_library_get(PointerRNA *ptr)
 {
   FileAssetSelectParams *params = ptr->data;
@@ -2568,7 +2570,7 @@ static int rna_FileAssetSelectParams_asset_library_get(PointerRNA *ptr)
   BLI_assert(ptr->type == &RNA_FileAssetSelectParams);
 
   /* Simple case: Predefined repo, just set the value. */
-  if (params->asset_library.type < FILE_ASSET_LIBRARY_CUSTOM) {
+  if (params->asset_library.type < ASSET_LIBRARY_CUSTOM) {
     return params->asset_library.type;
   }
 
@@ -2577,11 +2579,11 @@ static int rna_FileAssetSelectParams_asset_library_get(PointerRNA *ptr)
   const bUserAssetLibrary *user_library = BKE_preferences_asset_library_find_from_index(
       &U, params->asset_library.custom_library_index);
   if (user_library) {
-    return FILE_ASSET_LIBRARY_CUSTOM + params->asset_library.custom_library_index;
+    return ASSET_LIBRARY_CUSTOM + params->asset_library.custom_library_index;
   }
 
   BLI_assert(0);
-  return FILE_ASSET_LIBRARY_LOCAL;
+  return ASSET_LIBRARY_LOCAL;
 }
 
 static void rna_FileAssetSelectParams_asset_library_set(PointerRNA *ptr, int value)
@@ -2589,26 +2591,26 @@ static void rna_FileAssetSelectParams_asset_library_set(PointerRNA *ptr, int val
   FileAssetSelectParams *params = ptr->data;
 
   /* Simple case: Predefined repo, just set the value. */
-  if (value < FILE_ASSET_LIBRARY_CUSTOM) {
+  if (value < ASSET_LIBRARY_CUSTOM) {
     params->asset_library.type = value;
     params->asset_library.custom_library_index = -1;
-    BLI_assert(ELEM(value, FILE_ASSET_LIBRARY_LOCAL));
+    BLI_assert(ELEM(value, ASSET_LIBRARY_LOCAL));
     return;
   }
 
   const bUserAssetLibrary *user_library = BKE_preferences_asset_library_find_from_index(
-      &U, value - FILE_ASSET_LIBRARY_CUSTOM);
+      &U, value - ASSET_LIBRARY_CUSTOM);
 
   /* Note that the path isn't checked for validity here. If an invalid library path is used, the
    * Asset Browser can give a nice hint on what's wrong. */
   const bool is_valid = (user_library->name[0] && user_library->path[0]);
   if (!user_library) {
-    params->asset_library.type = FILE_ASSET_LIBRARY_LOCAL;
+    params->asset_library.type = ASSET_LIBRARY_LOCAL;
     params->asset_library.custom_library_index = -1;
   }
   else if (user_library && is_valid) {
-    params->asset_library.custom_library_index = value - FILE_ASSET_LIBRARY_CUSTOM;
-    params->asset_library.type = FILE_ASSET_LIBRARY_CUSTOM;
+    params->asset_library.custom_library_index = value - ASSET_LIBRARY_CUSTOM;
+    params->asset_library.type = ASSET_LIBRARY_CUSTOM;
   }
 }
 
@@ -2617,8 +2619,8 @@ static const EnumPropertyItem *rna_FileAssetSelectParams_asset_library_itemf(
 {
   const EnumPropertyItem predefined_items[] = {
       /* For the future. */
-      // {FILE_ASSET_REPO_BUNDLED, "BUNDLED", 0, "Bundled", "Show the default user assets"},
-      {FILE_ASSET_LIBRARY_LOCAL,
+      // {ASSET_REPO_BUNDLED, "BUNDLED", 0, "Bundled", "Show the default user assets"},
+      {ASSET_LIBRARY_LOCAL,
        "LOCAL",
        ICON_BLENDER,
        "Current File",
@@ -2646,7 +2648,7 @@ static const EnumPropertyItem *rna_FileAssetSelectParams_asset_library_itemf(
     }
 
     /* Use library path as description, it's a nice hint for users. */
-    EnumPropertyItem tmp = {FILE_ASSET_LIBRARY_CUSTOM + i,
+    EnumPropertyItem tmp = {ASSET_LIBRARY_CUSTOM + i,
                             user_library->name,
                             ICON_NONE,
                             user_library->name,
diff --git a/source/blender/makesrna/intern/rna_workspace.c b/source/blender/makesrna/intern/rna_workspace.c
index 6b52a38c2da..15bdeae16b6 100644
--- a/source/blender/makesrna/intern/rna_workspace.c
+++ b/source/blender/makesrna/intern/rna_workspace.c
@@ -107,6 +107,18 @@ static void rna_WorkSpace_owner_ids_clear(WorkSpace *workspace)
   WM_main_add_notifier(NC_OBJECT | ND_MODIFIER | NA_REMOVED, workspace);
 }
 
+static int rna_WorkSpace_active_asset_library_get(PointerRNA *ptr)
+{
+  const WorkSpace *workspace = ptr->data;
+  return rna_asset_library_reference_get(&workspace->active_asset_library);
+}
+
+static void rna_WorkSpace_active_asset_library_set(PointerRNA *ptr, int value)
+{
+  WorkSpace *workspace = ptr->data;
+  rna_asset_library_reference_set(&workspace->active_asset_library, value);
+}
+
 static bToolRef *rna_WorkSpace_tools_from_tkey(WorkSpace *workspace,
                                                const bToolKey *tkey,
                                                bool create)
@@ -407,6 +419,13 @@ static void rna_def_workspace(BlenderRNA *brna)
   RNA_def_property_ui_text(prop, "Use UI Tags", "Filter the UI by tags");
   RNA_def_property_update(prop, 0, "rna_window_update_all");
 
+  prop = rna_def_asset_library_reference_common(
+      srna, "rna_WorkSpace_active_asset_library_get", "rna_WorkSpace_active_asset_library_set");
+  RNA_def_property_ui_text(prop,
+                           "Asset Library",
+                           "Active asset library to show in the UI, not used by the Asset Browser "
+                           "(which has its own active asset library)");
+
   RNA_api_workspace(srna);
 }