Assets: Initial Asset List as part of the Asset System design

Implements a basic, WIP version of the asset list. This is needed to
give the asset view UI template asset reading and displaying
functionality.

See:
* Asset System: Data Storage, Reading & UI Access - https://developer.blender.org/T88184

Especially the asset list internals should change. It uses the
File/Asset Browser's `FileList` API, which isn't really meant for access
from outside the File Browser. But as explained in T88184, it does a lot
of the stuff we currently need, so we (Sybren Stüvel and I) decided to
go this route for now. Work on a file-list rewrite which integrates well
with the asset system started in the `asset-system-filelist` branch.

Further includes:
* Operator to reload the asset list.
* New `bpy.types.AssetHandle.get_full_library_path()` function, which
  gets the full path of the asset via the asset-list.
* Changes to preview loading to prevent the preview loading job to run
  eternally for asset views. File Browsers have this issue too, but
  should be fixed separately.

1 files changed, 28 insertions, 0 deletions

diff --git a/source/blender/editors/asset/asset_edit.cc b/source/blender/editors/asset/asset_edit.cc
index 949dc1890ad..0937af0dbf1 100644
--- a/source/blender/editors/asset/asset_edit.cc
+++ b/source/blender/editors/asset/asset_edit.cc
@@ -18,10 +18,15 @@
  * \ingroup edasset
  */
 
+#include <memory>
+#include <string>
+
 #include "BKE_asset.h"
 #include "BKE_context.h"
 #include "BKE_lib_id.h"
 
+#include "BLO_readfile.h"
+
 #include "DNA_ID.h"
 #include "DNA_asset_types.h"
 #include "DNA_space_types.h"
@@ -32,6 +37,8 @@
 
 #include "ED_asset.h"
 
+using namespace blender;
+
 bool ED_asset_mark_id(const bContext *C, ID *id)
 {
   if (id->asset_data) {
@@ -47,6 +54,9 @@ bool ED_asset_mark_id(const bContext *C, ID *id)
 
   UI_icon_render_id(C, nullptr, id, ICON_SIZE_PREVIEW, true);
 
+  /* Important for asset storage to update properly! */
+  ED_assetlist_storage_tag_main_data_dirty();
+
   return true;
 }
 
@@ -59,6 +69,9 @@ bool ED_asset_clear_id(ID *id)
   /* Don't clear fake user here, there's no guarantee that it was actually set by
    * #ED_asset_mark_id(), it might have been something/someone else. */
 
+  /* Important for asset storage to update properly! */
+  ED_assetlist_storage_tag_main_data_dirty();
+
   return true;
 }
 
@@ -125,3 +138,18 @@ const char *ED_asset_handle_get_name(const AssetHandle *asset)
 {
   return asset->file_data->name;
 }
+
+void ED_asset_handle_get_full_library_path(const bContext *C,
+                                           const AssetLibraryReference *asset_library,
+                                           const AssetHandle *asset,
+                                           char r_full_lib_path[FILE_MAX_LIBEXTRA])
+{
+  *r_full_lib_path = '\0';
+
+  std::string asset_path = ED_assetlist_asset_filepath_get(C, *asset_library, *asset);
+  if (asset_path.empty()) {
+    return;
+  }
+
+  BLO_library_path_explode(asset_path.c_str(), r_full_lib_path, nullptr, nullptr);
+}