asset_catalog_tree_view.cc

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/* SPDX-FileCopyrightText: 2021 Blender Authors
 *
 * SPDX-License-Identifier: GPL-2.0-or-later */

 
#include "DNA_space_types.h"
 
#include "AS_asset_catalog.hh"
#include "AS_asset_catalog_tree.hh"
#include "AS_asset_library.hh"
 
#include "BKE_asset.hh"
 
#include "BLI_listbase.h"
#include "BLI_string_ref.hh"
 
#include "BLT_translation.hh"
 
#include "ED_asset.hh"
#include "ED_fileselect.hh"
#include "ED_undo.hh"
 
#include "RNA_access.hh"
 
#include "UI_interface.hh"
#include "UI_resources.hh"
#include "UI_tree_view.hh"
 
#include "WM_api.hh"
#include "WM_types.hh"
 
#include "file_intern.hh"
#include "filelist.hh"
 
#include <fmt/format.h>
 
using namespace blender::asset_system;
 
namespace blender::ed::asset_browser {
 
class AssetCatalogTreeViewAllItem;
 
class AssetCatalogTreeView : public ui::AbstractTreeView {
  asset_system::AssetLibrary *asset_library_;
  const asset_system::AssetCatalogTree *catalog_tree_;
  FileAssetSelectParams *params_;
  SpaceFile &space_file_;
 
  friend class AssetCatalogTreeViewItem;
  friend class AssetCatalogDropTarget;
  friend class AssetCatalogTreeViewAllItem;
 
 public:
  AssetCatalogTreeView(asset_system::AssetLibrary *library,
                       FileAssetSelectParams *params,
                       SpaceFile &space_file);
 
  void build_tree() override;
 
  void activate_catalog_by_id(CatalogID catalog_id);
 
 private:
  ui::BasicTreeViewItem &build_catalog_items_recursive(ui::TreeViewOrItem &view_parent_item,
                                                       const AssetCatalogTreeItem &catalog);
 
  AssetCatalogTreeViewAllItem &add_all_item();
  void add_unassigned_item();
  bool is_active_catalog(CatalogID catalog_id) const;
};
 
/* ---------------------------------------------------------------------- */
 
class AssetCatalogTreeViewItem : public ui::BasicTreeViewItem {
  const AssetCatalogTreeItem &catalog_item_;
 
 public:
  AssetCatalogTreeViewItem(const AssetCatalogTreeItem &catalog_item);
 
  void on_activate(bContext &C) override;
 
  void build_row(uiLayout &row) override;
  void build_context_menu(bContext &C, uiLayout &column) const override;
 
  bool supports_renaming() const override;
  bool rename(const bContext &C, StringRefNull new_name) override;

  std::unique_ptr<ui::AbstractViewItemDragController> create_drag_controller() const override;
  std::unique_ptr<ui::TreeViewItemDropTarget> create_drop_target() override;
};
 
class AssetCatalogDragController : public ui::AbstractViewItemDragController {
  const AssetCatalogTreeItem &catalog_item_;
 
 public:
  explicit AssetCatalogDragController(AssetCatalogTreeView &tree_view,
                                      const AssetCatalogTreeItem &catalog_item);
 
  eWM_DragDataType get_drag_type() const override;
  void *create_drag_data() const override;
  void on_drag_start() override;
};
 
class AssetCatalogDropTarget : public ui::TreeViewItemDropTarget {
  const AssetCatalogTreeItem &catalog_item_;
 
 public:
  AssetCatalogDropTarget(AssetCatalogTreeViewItem &item, const AssetCatalogTreeItem &catalog_item);
 
  bool can_drop(const wmDrag &drag, const char **r_disabled_hint) const override;
  std::string drop_tooltip(const ui::DragInfo &drag_info) const override;
  bool on_drop(bContext *C, const ui::DragInfo &drag_info) const override;
 
  asset_system::AssetLibrary &get_asset_library() const;
 
  static AssetCatalog *get_drag_catalog(const wmDrag &drag,
                                        const asset_system::AssetLibrary &asset_library);
  static bool has_droppable_asset(const wmDrag &drag, const char **r_disabled_hint);
  static bool can_modify_catalogs(const asset_system::AssetLibrary &asset_library,
                                  const char **r_disabled_hint);
  static bool drop_assets_into_catalog(bContext *C,
                                       const AssetCatalogTreeView &tree_view,
                                       const wmDrag &drag,
                                       CatalogID catalog_id,
                                       StringRefNull simple_name = "");
  static bool drop_asset_catalog_into_catalog(
      const wmDrag &drag,
      AssetCatalogTreeView &tree_view,
      const std::optional<CatalogID> drop_catalog_id = std::nullopt);
 
 private:
  std::string drop_tooltip_asset_list(const wmDrag &drag) const;
  std::string drop_tooltip_asset_catalog(const wmDrag &drag) const;
};

class AssetCatalogTreeViewAllItem : public ui::BasicTreeViewItem {
  using BasicTreeViewItem::BasicTreeViewItem;
 
  void build_row(uiLayout &row) override;
 
  struct DropTarget : public ui::TreeViewItemDropTarget {
    DropTarget(AssetCatalogTreeViewAllItem &item);
 
    bool can_drop(const wmDrag &drag, const char **r_disabled_hint) const override;
    std::string drop_tooltip(const ui::DragInfo &drag_info) const override;
    bool on_drop(bContext *C, const ui::DragInfo &drag_info) const override;
  };
 
  std::unique_ptr<ui::TreeViewItemDropTarget> create_drop_target() override;
};
 
class AssetCatalogTreeViewUnassignedItem : public ui::BasicTreeViewItem {
  using BasicTreeViewItem::BasicTreeViewItem;
 
  struct DropTarget : public ui::TreeViewItemDropTarget {
    DropTarget(AssetCatalogTreeViewUnassignedItem &item);
 
    bool can_drop(const wmDrag &drag, const char **r_disabled_hint) const override;
    std::string drop_tooltip(const ui::DragInfo &drag_info) const override;
    bool on_drop(bContext *C, const ui::DragInfo &drag_info) const override;
  };
 
  std::unique_ptr<ui::TreeViewItemDropTarget> create_drop_target() override;
};
 
/* ---------------------------------------------------------------------- */
 
AssetCatalogTreeView::AssetCatalogTreeView(asset_system::AssetLibrary *library,
                                           FileAssetSelectParams *params,
                                           SpaceFile &space_file)
    : asset_library_(library), params_(params), space_file_(space_file)
{
  if (library) {
    catalog_tree_ = &library->catalog_service().catalog_tree();
  }
  else {
    catalog_tree_ = nullptr;
  }
}
 
void AssetCatalogTreeView::build_tree()
{
  AssetCatalogTreeViewAllItem &all_item = add_all_item();
  all_item.uncollapse_by_default();
 
  if (catalog_tree_) {
    /* Pass the "All" item on as parent of the actual catalog items. */
    catalog_tree_->foreach_root_item([this, &all_item](const AssetCatalogTreeItem &item) {
      build_catalog_items_recursive(all_item, item);
    });
  }
 
  add_unassigned_item();
}
 
ui::BasicTreeViewItem &AssetCatalogTreeView::build_catalog_items_recursive(
    ui::TreeViewOrItem &view_parent_item, const AssetCatalogTreeItem &catalog)
{
  ui::BasicTreeViewItem &view_item = view_parent_item.add_tree_item<AssetCatalogTreeViewItem>(
      catalog);
  view_item.set_is_active_fn(
      [this, &catalog]() { return is_active_catalog(catalog.get_catalog_id()); });
 
  catalog.foreach_child([&view_item, this](const AssetCatalogTreeItem &child) {
    build_catalog_items_recursive(view_item, child);
  });
  return view_item;
}
 
AssetCatalogTreeViewAllItem &AssetCatalogTreeView::add_all_item()
{
  FileAssetSelectParams *params = params_;
 
  AssetCatalogTreeViewAllItem &item = add_tree_item<AssetCatalogTreeViewAllItem>(IFACE_("All"));
  item.set_on_activate_fn([params](bContext & /*C*/, ui::BasicTreeViewItem & /*item*/) {
    params->asset_catalog_visibility = FILE_SHOW_ASSETS_ALL_CATALOGS;
    WM_main_add_notifier(NC_SPACE | ND_SPACE_ASSET_PARAMS, nullptr);
  });
  item.set_is_active_fn(
      [params]() { return params->asset_catalog_visibility == FILE_SHOW_ASSETS_ALL_CATALOGS; });
  return item;
}
 
void AssetCatalogTreeView::add_unassigned_item()
{
  FileAssetSelectParams *params = params_;
 
  AssetCatalogTreeViewUnassignedItem &item = add_tree_item<AssetCatalogTreeViewUnassignedItem>(
      IFACE_("Unassigned"), ICON_FILE_HIDDEN);
 
  item.set_on_activate_fn([params](bContext & /*C*/, ui::BasicTreeViewItem & /*item*/) {
    params->asset_catalog_visibility = FILE_SHOW_ASSETS_WITHOUT_CATALOG;
    WM_main_add_notifier(NC_SPACE | ND_SPACE_ASSET_PARAMS, nullptr);
  });
  item.set_is_active_fn(
      [params]() { return params->asset_catalog_visibility == FILE_SHOW_ASSETS_WITHOUT_CATALOG; });
}
 
void AssetCatalogTreeView::activate_catalog_by_id(CatalogID catalog_id)
{
  params_->asset_catalog_visibility = FILE_SHOW_ASSETS_FROM_CATALOG;
  params_->catalog_id = catalog_id;
  WM_main_add_notifier(NC_SPACE | ND_SPACE_ASSET_PARAMS, nullptr);
}
 
bool AssetCatalogTreeView::is_active_catalog(CatalogID catalog_id) const
{
  return (params_->asset_catalog_visibility == FILE_SHOW_ASSETS_FROM_CATALOG) &&
         (params_->catalog_id == catalog_id);
}
 
/* ---------------------------------------------------------------------- */
 
AssetCatalogTreeViewItem::AssetCatalogTreeViewItem(const AssetCatalogTreeItem &catalog_item)
    : BasicTreeViewItem(catalog_item.get_name()), catalog_item_(catalog_item)
{
}
 
void AssetCatalogTreeViewItem::on_activate(bContext & /*C*/)
{
  AssetCatalogTreeView &tree_view = static_cast<AssetCatalogTreeView &>(get_tree_view());
  tree_view.activate_catalog_by_id(catalog_item_.get_catalog_id());
}
 
void AssetCatalogTreeViewItem::build_row(uiLayout &row)
{
  const std::string label_override = catalog_item_.has_unsaved_changes() ? (label_ + "*") : label_;
  this->add_label(row, label_override);
 
  if (!is_hovered()) {
    return;
  }
 
  uiButViewItem *view_item_but = view_item_button();
  PointerRNA *props;
 
  props = UI_but_extra_operator_icon_add(
      (uiBut *)view_item_but, "ASSET_OT_catalog_new", WM_OP_INVOKE_DEFAULT, ICON_ADD);
  RNA_string_set(props, "parent_path", catalog_item_.catalog_path().c_str());
}
 
void AssetCatalogTreeViewItem::build_context_menu(bContext &C, uiLayout &column) const
{
  PointerRNA props;
 
  props = column.op("ASSET_OT_catalog_new",
                    IFACE_("New Catalog"),
                    ICON_NONE,
                    WM_OP_INVOKE_DEFAULT,
                    UI_ITEM_NONE);
  RNA_string_set(&props, "parent_path", catalog_item_.catalog_path().c_str());
 
  props = column.op("ASSET_OT_catalog_delete",
                    IFACE_("Delete Catalog"),
                    ICON_NONE,
                    WM_OP_INVOKE_DEFAULT,
                    UI_ITEM_NONE);
  RNA_string_set(&props, "catalog_id", catalog_item_.get_catalog_id().str().c_str());
  column.op("UI_OT_view_item_rename", IFACE_("Rename"), ICON_NONE);
 
  /* Doesn't actually exist right now, but could be defined in Python. Reason that this isn't done
   * in Python yet is that catalogs are not exposed in BPY, and we'd somehow pass the clicked on
   * catalog to the menu draw callback (via context probably). */
  MenuType *mt = WM_menutype_find("ASSETBROWSER_MT_catalog_context_menu", true);
  if (!mt) {
    return;
  }
  UI_menutype_draw(&C, mt, &column);
}
 
bool AssetCatalogTreeViewItem::supports_renaming() const
{
  const AssetCatalogTreeView &tree_view = static_cast<const AssetCatalogTreeView &>(
      this->get_tree_view());
  return !asset::catalogs_read_only(*tree_view.asset_library_);
}
 
bool AssetCatalogTreeViewItem::rename(const bContext &C, StringRefNull new_name)
{
  /* Important to keep state. */
  BasicTreeViewItem::rename(C, new_name);
 
  const AssetCatalogTreeView &tree_view = static_cast<const AssetCatalogTreeView &>(
      this->get_tree_view());
  asset::catalog_rename(tree_view.asset_library_, catalog_item_.get_catalog_id(), new_name);
  return true;
}
 
std::unique_ptr<ui::TreeViewItemDropTarget> AssetCatalogTreeViewItem::create_drop_target()
{
  return std::make_unique<AssetCatalogDropTarget>(*this, catalog_item_);
}
 
std::unique_ptr<ui::AbstractViewItemDragController> AssetCatalogTreeViewItem::
    create_drag_controller() const
{
  return std::make_unique<AssetCatalogDragController>(
      static_cast<AssetCatalogTreeView &>(this->get_tree_view()), catalog_item_);
}
 
/* ---------------------------------------------------------------------- */
 
AssetCatalogDropTarget::AssetCatalogDropTarget(AssetCatalogTreeViewItem &item,
                                               const AssetCatalogTreeItem &catalog_item)
    : ui::TreeViewItemDropTarget(item), catalog_item_(catalog_item)
{
}
 
bool AssetCatalogDropTarget::can_drop(const wmDrag &drag, const char **r_disabled_hint) const
{
  if (drag.type == WM_DRAG_ASSET_CATALOG) {
    const asset_system::AssetLibrary &library = get_asset_library();
    if (!can_modify_catalogs(library, r_disabled_hint)) {
      return false;
    }
 
    const AssetCatalog *drag_catalog = get_drag_catalog(drag, library);
    /* NOTE: Technically it's not an issue to allow this (the catalog will just receive a new
     * path and the catalog system will generate missing parents from the path). But it does
     * appear broken to users, so disabling entirely. */
    if (catalog_item_.catalog_path().is_contained_in(drag_catalog->path)) {
      *r_disabled_hint = RPT_("Catalog cannot be dropped into itself");
      return false;
    }
    if (catalog_item_.catalog_path() == drag_catalog->path.parent()) {
      *r_disabled_hint = RPT_("Catalog is already placed inside this catalog");
      return false;
    }
    return true;
  }
 
  if (drag.type == WM_DRAG_ASSET_LIST && has_droppable_asset(drag, r_disabled_hint)) {
    return true;
  }
  return false;
}
 
std::string AssetCatalogDropTarget::drop_tooltip(const ui::DragInfo &drag_info) const
{
  if (drag_info.drag_data.type == WM_DRAG_ASSET_CATALOG) {
    return this->drop_tooltip_asset_catalog(drag_info.drag_data);
  }
  return this->drop_tooltip_asset_list(drag_info.drag_data);
}
 
std::string AssetCatalogDropTarget::drop_tooltip_asset_catalog(const wmDrag &drag) const
{
  BLI_assert(drag.type == WM_DRAG_ASSET_CATALOG);
  const AssetCatalog *src_catalog = get_drag_catalog(drag, get_asset_library());
 
  return fmt::format(fmt::runtime(TIP_("Move catalog {} into {}")),
                     src_catalog->path.name(),
                     catalog_item_.get_name());
}
 
std::string AssetCatalogDropTarget::drop_tooltip_asset_list(const wmDrag &drag) const
{
  BLI_assert(drag.type == WM_DRAG_ASSET_LIST);
 
  const ListBase *asset_drags = WM_drag_asset_list_get(&drag);
  const bool is_multiple_assets = !BLI_listbase_is_single(asset_drags);
 
  /* Don't try to be smart by dynamically adding the 's' for the plural. Just makes translation
   * harder, so use full literals. */
  std::string basic_tip = is_multiple_assets ? TIP_("Move assets to catalog") :
                                               TIP_("Move asset to catalog");
 
  basic_tip += ": " + catalog_item_.get_name();
 
  /* Display the full catalog path, but only if it's not exactly the same as the already shown name
   * (i.e. not a root level catalog with no parent). */
  if (catalog_item_.get_name() != catalog_item_.catalog_path().str()) {
    basic_tip += " (" + catalog_item_.catalog_path().str() + ")";
  }
 
  return basic_tip;
}
 
bool AssetCatalogDropTarget::on_drop(bContext *C, const ui::DragInfo &drag_info) const
{
  if (drag_info.drag_data.type == WM_DRAG_ASSET_CATALOG) {
    return drop_asset_catalog_into_catalog(drag_info.drag_data,
                                           this->get_view<AssetCatalogTreeView>(),
                                           catalog_item_.get_catalog_id());
  }
  return drop_assets_into_catalog(C,
                                  this->get_view<AssetCatalogTreeView>(),
                                  drag_info.drag_data,
                                  catalog_item_.get_catalog_id(),
                                  catalog_item_.get_simple_name());
}
 
bool AssetCatalogDropTarget::drop_asset_catalog_into_catalog(
    const wmDrag &drag,
    AssetCatalogTreeView &tree_view,
    const std::optional<CatalogID> drop_catalog_id)
{
  BLI_assert(drag.type == WM_DRAG_ASSET_CATALOG);
  wmDragAssetCatalog *catalog_drag = WM_drag_get_asset_catalog_data(&drag);
  asset::catalog_move(tree_view.asset_library_, catalog_drag->drag_catalog_id, drop_catalog_id);
  tree_view.activate_catalog_by_id(catalog_drag->drag_catalog_id);
 
  WM_main_add_notifier(NC_ASSET | ND_ASSET_CATALOGS, nullptr);
  return true;
}
 
bool AssetCatalogDropTarget::drop_assets_into_catalog(bContext *C,
                                                      const AssetCatalogTreeView &tree_view,
                                                      const wmDrag &drag,
                                                      CatalogID catalog_id,
                                                      StringRefNull simple_name)
{
  BLI_assert(drag.type == WM_DRAG_ASSET_LIST);
  const ListBase *asset_drags = WM_drag_asset_list_get(&drag);
  if (!asset_drags) {
    return false;
  }
 
  bool did_update = false;
  LISTBASE_FOREACH (wmDragAssetListItem *, asset_item, asset_drags) {
    if (asset_item->is_external) {
      /* Only internal assets can be modified! */
      continue;
    }
 
    did_update = true;
    BKE_asset_metadata_catalog_id_set(
        asset_item->asset_data.local_id->asset_data, catalog_id, simple_name.c_str());
 
    /* Trigger re-run of filtering to update visible assets. */
    filelist_tag_needs_filtering(tree_view.space_file_.files);
    file_select_deselect_all(&tree_view.space_file_, FILE_SEL_SELECTED | FILE_SEL_HIGHLIGHTED);
    WM_main_add_notifier(NC_SPACE | ND_SPACE_FILE_LIST, nullptr);
    WM_main_add_notifier(NC_ASSET | ND_ASSET_CATALOGS, nullptr);
  }
 
  if (did_update) {
    ED_undo_push(C, "Assign Asset Catalog");
  }
  return true;
}
 
AssetCatalog *AssetCatalogDropTarget::get_drag_catalog(
    const wmDrag &drag, const asset_system::AssetLibrary &asset_library)
{
  if (drag.type != WM_DRAG_ASSET_CATALOG) {
    return nullptr;
  }
  const AssetCatalogService &catalog_service = asset_library.catalog_service();
  const wmDragAssetCatalog *catalog_drag = WM_drag_get_asset_catalog_data(&drag);
 
  return catalog_service.find_catalog(catalog_drag->drag_catalog_id);
}
 
bool AssetCatalogDropTarget::has_droppable_asset(const wmDrag &drag, const char **r_disabled_hint)
{
  const ListBase *asset_drags = WM_drag_asset_list_get(&drag);
 
  *r_disabled_hint = nullptr;
  /* There needs to be at least one asset from the current file. */
  LISTBASE_FOREACH (const wmDragAssetListItem *, asset_item, asset_drags) {
    if (!asset_item->is_external) {
      return true;
    }
  }
 
  *r_disabled_hint = RPT_("Only assets from this current file can be moved between catalogs");
  return false;
}
 
bool AssetCatalogDropTarget::can_modify_catalogs(const asset_system::AssetLibrary &library,
                                                 const char **r_disabled_hint)
{
  if (asset::catalogs_read_only(library)) {
    *r_disabled_hint = RPT_("Catalogs cannot be edited in this asset library");
    return false;
  }
  return true;
}
 
asset_system::AssetLibrary &AssetCatalogDropTarget::get_asset_library() const
{
  return *this->get_view<AssetCatalogTreeView>().asset_library_;
}
 
/* ---------------------------------------------------------------------- */
 
AssetCatalogDragController::AssetCatalogDragController(AssetCatalogTreeView &tree_view,
                                                       const AssetCatalogTreeItem &catalog_item)
    : ui::AbstractViewItemDragController(tree_view), catalog_item_(catalog_item)
{
}
 
eWM_DragDataType AssetCatalogDragController::get_drag_type() const
{
  return WM_DRAG_ASSET_CATALOG;
}
 
void *AssetCatalogDragController::create_drag_data() const
{
  wmDragAssetCatalog *drag_catalog = (wmDragAssetCatalog *)MEM_callocN(sizeof(*drag_catalog),
                                                                       __func__);
  drag_catalog->drag_catalog_id = catalog_item_.get_catalog_id();
  return drag_catalog;
}
 
void AssetCatalogDragController::on_drag_start()
{
  AssetCatalogTreeView &tree_view_ = this->get_view<AssetCatalogTreeView>();
  tree_view_.activate_catalog_by_id(catalog_item_.get_catalog_id());
}
 
/* ---------------------------------------------------------------------- */
 
void AssetCatalogTreeViewAllItem::build_row(uiLayout &row)
{
  ui::BasicTreeViewItem::build_row(row);
 
  PointerRNA *props;
 
  UI_but_extra_operator_icon_add(reinterpret_cast<uiBut *>(this->view_item_button()),
                                 "ASSET_OT_catalogs_save",
                                 WM_OP_INVOKE_DEFAULT,
                                 ICON_FILE_TICK);
 
  props = UI_but_extra_operator_icon_add(reinterpret_cast<uiBut *>(this->view_item_button()),
                                         "ASSET_OT_catalog_new",
                                         WM_OP_INVOKE_DEFAULT,
                                         ICON_ADD);
  /* No parent path to use the root level. */
  RNA_string_set(props, "parent_path", nullptr);
}
 
std::unique_ptr<ui::TreeViewItemDropTarget> AssetCatalogTreeViewAllItem::create_drop_target()
{
  return std::make_unique<AssetCatalogTreeViewAllItem::DropTarget>(*this);
}
 
AssetCatalogTreeViewAllItem::DropTarget::DropTarget(AssetCatalogTreeViewAllItem &item)
    : ui::TreeViewItemDropTarget(item)
{
}
 
bool AssetCatalogTreeViewAllItem::DropTarget::can_drop(const wmDrag &drag,
                                                       const char **r_disabled_hint) const
{
  if (drag.type != WM_DRAG_ASSET_CATALOG) {
    return false;
  }
  asset_system::AssetLibrary &library = *this->get_view<AssetCatalogTreeView>().asset_library_;
  if (!AssetCatalogDropTarget::can_modify_catalogs(library, r_disabled_hint)) {
    return false;
  }
 
  const AssetCatalog *drag_catalog = AssetCatalogDropTarget::get_drag_catalog(drag, library);
  if (drag_catalog->path.parent() == "") {
    *r_disabled_hint = RPT_("Catalog is already placed at the highest level");
    return false;
  }
 
  return true;
}
 
std::string AssetCatalogTreeViewAllItem::DropTarget::drop_tooltip(
    const ui::DragInfo &drag_info) const
{
  BLI_assert(drag_info.drag_data.type == WM_DRAG_ASSET_CATALOG);
  const AssetCatalog *drag_catalog = AssetCatalogDropTarget::get_drag_catalog(
      drag_info.drag_data, *this->get_view<AssetCatalogTreeView>().asset_library_);
 
  return fmt::format(fmt::runtime(TIP_("Move catalog {} to the top level of the tree")),
                     drag_catalog->path.name());
}
 
bool AssetCatalogTreeViewAllItem::DropTarget::on_drop(bContext * /*C*/,
                                                      const ui::DragInfo &drag_info) const
{
  BLI_assert(drag_info.drag_data.type == WM_DRAG_ASSET_CATALOG);
  return AssetCatalogDropTarget::drop_asset_catalog_into_catalog(
      drag_info.drag_data,
      this->get_view<AssetCatalogTreeView>(),
      /* No value to drop into the root level. */
      std::nullopt);
}
 
/* ---------------------------------------------------------------------- */
 
std::unique_ptr<ui::TreeViewItemDropTarget> AssetCatalogTreeViewUnassignedItem::
    create_drop_target()
{
  return std::make_unique<AssetCatalogTreeViewUnassignedItem::DropTarget>(*this);
}
 
AssetCatalogTreeViewUnassignedItem::DropTarget::DropTarget(
    AssetCatalogTreeViewUnassignedItem &item)
    : ui::TreeViewItemDropTarget(item)
{
}
 
bool AssetCatalogTreeViewUnassignedItem::DropTarget::can_drop(const wmDrag &drag,
                                                              const char **r_disabled_hint) const
{
  if (drag.type != WM_DRAG_ASSET_LIST) {
    return false;
  }
  return AssetCatalogDropTarget::has_droppable_asset(drag, r_disabled_hint);
}
 
std::string AssetCatalogTreeViewUnassignedItem::DropTarget::drop_tooltip(
    const ui::DragInfo &drag_info) const
{
  const ListBase *asset_drags = WM_drag_asset_list_get(&drag_info.drag_data);
  const bool is_multiple_assets = !BLI_listbase_is_single(asset_drags);
 
  return is_multiple_assets ? TIP_("Move assets out of any catalog") :
                              TIP_("Move asset out of any catalog");
}
 
bool AssetCatalogTreeViewUnassignedItem::DropTarget::on_drop(bContext *C,
                                                             const ui::DragInfo &drag_info) const
{
  /* Assign to nil catalog ID. */
  return AssetCatalogDropTarget::drop_assets_into_catalog(
      C, this->get_view<AssetCatalogTreeView>(), drag_info.drag_data, CatalogID{});
}
 
/* ---------------------------------------------------------------------- */
 
class AssetCatalogFilterSettings {
 public:
  eFileSel_Params_AssetCatalogVisibility asset_catalog_visibility;
  bUUID asset_catalog_id;
 
  std::unique_ptr<AssetCatalogFilter> catalog_filter;
};
 
AssetCatalogFilterSettings *file_create_asset_catalog_filter_settings()
{
  return MEM_new<AssetCatalogFilterSettings>(__func__);
}
 
void file_delete_asset_catalog_filter_settings(AssetCatalogFilterSettings **filter_settings)
{
  MEM_delete(*filter_settings);
  *filter_settings = nullptr;
}
 
bool file_set_asset_catalog_filter_settings(
    AssetCatalogFilterSettings *filter_settings,
    eFileSel_Params_AssetCatalogVisibility catalog_visibility,
    const ::bUUID &catalog_id)
{
  bool needs_update = false;
 
  if (filter_settings->asset_catalog_visibility != catalog_visibility) {
    filter_settings->asset_catalog_visibility = catalog_visibility;
    needs_update = true;
  }
 
  if (filter_settings->asset_catalog_visibility == FILE_SHOW_ASSETS_FROM_CATALOG &&
      !BLI_uuid_equal(filter_settings->asset_catalog_id, catalog_id))
  {
    filter_settings->asset_catalog_id = catalog_id;
    needs_update = true;
  }
 
  return needs_update;
}
 
void file_ensure_updated_catalog_filter_data(AssetCatalogFilterSettings *filter_settings,
                                             const asset_system::AssetLibrary *asset_library)
{
  const AssetCatalogService &catalog_service = asset_library->catalog_service();
 
  if (filter_settings->asset_catalog_visibility != FILE_SHOW_ASSETS_ALL_CATALOGS) {
    filter_settings->catalog_filter = std::make_unique<AssetCatalogFilter>(
        catalog_service.create_catalog_filter(filter_settings->asset_catalog_id));
  }
}
 
bool file_is_asset_visible_in_catalog_filter_settings(
    const AssetCatalogFilterSettings *filter_settings, const AssetMetaData *asset_data)
{
  switch (filter_settings->asset_catalog_visibility) {
    case FILE_SHOW_ASSETS_WITHOUT_CATALOG:
      return !filter_settings->catalog_filter->is_known(asset_data->catalog_id);
    case FILE_SHOW_ASSETS_FROM_CATALOG:
      return filter_settings->catalog_filter->contains(asset_data->catalog_id);
    case FILE_SHOW_ASSETS_ALL_CATALOGS:
      /* All asset files should be visible. */
      return true;
  }
 
  BLI_assert_unreachable();
  return false;
}
 
/* ---------------------------------------------------------------------- */
 
void file_create_asset_catalog_tree_view_in_layout(const bContext *C,
                                                   asset_system::AssetLibrary *asset_library,
                                                   uiLayout *layout,
                                                   SpaceFile *space_file,
                                                   FileAssetSelectParams *params)
{
  uiBlock *block = uiLayoutGetBlock(layout);
 
  UI_block_layout_set_current(block, layout);
 
  ui::AbstractTreeView *tree_view = UI_block_add_view(
      *block,
      "asset catalog tree view",
      std::make_unique<ed::asset_browser::AssetCatalogTreeView>(
          asset_library, params, *space_file));
  tree_view->set_context_menu_title("Catalog");
  ui::TreeViewBuilder::build_tree_view(*C, *tree_view, *layout);
}
 
}  // namespace blender::ed::asset_browser