An "All" asset library can be selected in the Asset Browser and asset
view templates now, and that will load all assets from all asset
libraries. Preview loading, drag & drop and asset catalogs don't work
yet.

@@ -0,0 +193,4 @@
+
+void AssetViewItem::build_context_menu(bContext &C, uiLayout &column) const
+{
+  const AssetView &asset_view = dynamic_cast<AssetView &>(get_view());

@@ -0,0 +28,4 @@
+#include "asset_shelf.hh"
+
+using namespace blender;
+using namespace blender::ed::asset;

@@ -8248,0 +8264,4 @@
+        return bool(context.object and context.object.mode == 'SCULPT')
+
+    @classmethod
+    def asset_poll__(cls, asset):

@@ -0,0 +439,4 @@
+{
+  static const char *context_dir[] = {
+      "asset_shelf",
+      "asset_library_ref",

@@ -2220,0 +2286,4 @@
+
+  /* regions: asset shelf settings */
+  art = MEM_cnew<ARegionType>("spacetype view3d asset shelf settings region");
+  art->regionid = RGN_TYPE_ASSET_SHELF_SETTINGS;

@@ -361,6 +361,8 @@ typedef struct View3D {
   /** Path to the viewer node that is currently previewed. This is retrieved from the workspace. */
   ViewerPath viewer_path;
 
+  struct AssetShelfHook *asset_shelf_hook;

@@ -496,2 +496,4 @@
 #define ND_SPACE_FILE_PREVIEW (21 << 16)
 #define ND_SPACE_SPREADSHEET (22 << 16)
+/* Not a space itself, but a part of another space. */
+#define ND_SPACE_ASSET_SHELF (23 << 16)

@@ -908,0 +900,4 @@
+      /* The region size may be set dynamically through #ARegionType.layout(). So if the region is
+       * only hidden because it's too small, still run the layout in case that leads to a different
+       * region size. */
+      const bool hidden_because_too_small = (region->flag & RGN_FLAG_TOO_SMALL) &&

@@ -0,0 +209,4 @@
+{
+  const AssetView &asset_view = dynamic_cast<const AssetView &>(get_view());
+  const AssetShelfType &shelf_type = *asset_view.shelf_.type;
+  shelf_type.draw_context_menu(&C, &shelf_type, &asset_, &column);

@@ -0,0 +40,4 @@
+
+  next = prev = nullptr;
+
+  active_catalog_path = BLI_strdup(other.active_catalog_path);

@@ -5007,3 +5008,3 @@
 #define PREVIEW_TILE_PAD (0.15f * UI_UNIT_X)
 
-int UI_preview_tile_size_x()
+int UI_preview_tile_size_x(const int unscaled_size)

@@ -1759,1 +1794,4 @@
   }
+  if (flag & ED_KEYMAP_ASSET_SHELF) {
+    /* standard keymap for asset shelf regions */
+    wmKeyMap *keymap = WM_keymap_ensure(wm->defaultconf, "Asset Shelf", 0, 0);

@@ -339,0 +356,4 @@
+static void view3d_init(wmWindowManager * /*wm*/, ScrArea *area)
+{
+  BLI_assert(area->spacetype == SPACE_VIEW3D);
+  View3D *v3d = static_cast<View3D *>(area->spacedata.first);

@@ -1081,0 +1205,4 @@
+  }
+
+  SpaceType *space_type = BKE_spacetype_from_id(dummy_shelf_type.space_type);
+  if (!space_type) {

@@ -0,0 +1,36 @@
+# SPDX-License-Identifier: GPL-2.0-or-later

@@ -1275,2 +1276,4 @@
         layout.prop(view, "show_region_ui")
         layout.prop(view, "show_region_tool_header")
+        if prefs.experimental.use_asset_shelf:
+            layout.prop(view, "show_regions_asset_shelf")

@@ -416,0 +422,4 @@
+typedef enum AssetShelfTypeFlag {
+  /** Do not trigger asset dragging on drag events. Drag events can be overridden with custom
+   * keymap items then. */
+  ASSET_SHELF_TYPE_NO_ASSET_DRAG = (1 << 0),

@@ -52,6 +52,10 @@
 
 #include "BLO_read_write.h"
 
+/* TODO(Julian): For asset shelf region reading/writing. Region read/write should be done via a

@@ -0,0 +1,697 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */

@@ -0,0 +99,4 @@
+static void activate_shelf(RegionAssetShelf &shelf_regiondata, AssetShelf &shelf)
+{
+  shelf_regiondata.active_shelf = &shelf;
+  BLI_remlink_safe(&shelf_regiondata.shelves, &shelf);

@@ -427,0 +430,4 @@
+   * they will be upscaled to the button size. Should probably be done by the widget code. */
+  const int is_preview_flag = (BKE_icon_is_preview(preview_icon_id) ||
+                               BKE_icon_is_image(preview_icon_id)) ?
+                                  UI_BUT_ICON_PREVIEW :

@@ -859,6 +859,22 @@ static void rna_Space_show_region_hud_update(bContext *C, PointerRNA *ptr)
   rna_Space_bool_from_region_flag_update_by_type(C, ptr, RGN_TYPE_HUD, RGN_FLAG_HIDDEN_BY_USER);
 }
 
+/* Asset Shelf Regions */