opf · myabc · May 10, 2026
diff --git a/app/components/_index.sass b/app/components/_index.sass
@@ -1,5 +1,6 @@
 @import "enterprise_edition/banner_component"
 @import "filter/filters_component"
+@import "op_primer/border_box_list_component"
 @import "op_primer/border_box_table_component"
 @import "op_primer/full_page_prompt_component"
 @import "op_primer/form_helpers"
@@ -12,7 +13,6 @@
 @import "open_project/common/submenu_component"
 @import "open_project/common/main_menu_toggle_component"
 @import "open_project/common/work_package_card_list_component"
-@import "open_project/common/work_package_card_list_component/header"
 @import "open_project/common/work_package_card_component"
 @import "portfolios/details_component"
 @import "projects/row_component"

diff --git a/...work_package_card_list_component.html.erb → ...primer/border_box_list_component.html.erb b/...work_package_card_list_component.html.erb → ...primer/border_box_list_component.html.erb
@@ -29,25 +29,19 @@ See COPYRIGHT and LICENSE files for more details.
 
 <%= render(Primer::Beta::BorderBox.new(**@system_arguments)) do |border_box| %>
   <% if header? %>
-    <% border_box.with_header(id: header_id) do %>
+    <% border_box.with_header(**header.row_args) do %>
       <%= header %>
     <% end %>
   <% end %>
 
-  <% if items.empty? %>
-    <% border_box.with_row(data: { empty_list_item: true }) do %>
-      <%= empty_state %>
-    <% end %>
-  <% else %>
-    <% items.each do |item| %>
-      <% border_box.with_row(**item.row_args) do %>
-        <%= render(item.card) %>
-      <% end %>
+  <% items.each do |item| %>
+    <% border_box.with_row(**item.row_args) do %>
+      <%= item %>
     <% end %>
   <% end %>
 
   <% if footer? %>
-    <% border_box.with_row(scheme: :neutral) do %>
+    <% border_box.with_footer(**footer.footer_args) do %>
       <%= footer %>
     <% end %>
   <% end %>

diff --git a/app/components/op_primer/border_box_list_component.rb b/app/components/op_primer/border_box_list_component.rb
@@ -0,0 +1,146 @@
+# frozen_string_literal: true
+
+#-- copyright
+# OpenProject is an open source project management software.
+# Copyright (C) the OpenProject GmbH
+#
+# This program is free software; you can redistribute it and/or
+# modify it under the terms of the GNU General Public License version 3.
+#
+# OpenProject is a fork of ChiliProject, which is a fork of Redmine. The copyright follows:
+# Copyright (C) 2006-2013 Jean-Philippe Lang
+# Copyright (C) 2010-2013 the ChiliProject Team
+#
+# This program is free software; you can redistribute it and/or
+# modify it under the terms of the GNU General Public License
+# as published by the Free Software Foundation; either version 2
+# of the License, or (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+#
+# See COPYRIGHT and LICENSE files for more details.
+#++
+
+module OpPrimer
+  # Static BorderBox-backed list shell for callers that need ordered header,
+  # item, empty-item, and footer content without list behavior such as sorting
+  # or reordering.
+  class BorderBoxListComponent < ApplicationComponent
+    # @!parse
+    #   # Adds a structured header rendered through the underlying BorderBox
+    #   # header slot, with optional count, description, actions, and menu.
+    #   #
+    #   # @param title [String] header title.
+    #   # @param count [Integer, nil] optional count badge.
+    #   # @param list_id [String, nil] id of the collapsible BorderBox list body.
+    #   # @param collapsed [Boolean] whether the collapsible header starts closed.
+    #   # @param count_aria_label [String, nil] accessible label for the count badge.
+    #   # @param system_arguments [Hash] forwarded to `Header`, whose `row_args`
+    #   #   are forwarded to `Primer::Beta::BorderBox#with_header`.
+    #   def with_header(title:, **system_arguments, &block)
+    #   end
+    renders_one :header, ->(**system_arguments) {
+      system_arguments[:list_id] ||= list_id
+
+      Header.new(**system_arguments)
+    }
+
+    # @!parse
+    #   # Adds an arbitrary content row.
+    #   #
+    #   # @param component_klass [Class] class to use instead of the default
+    #   #   `Item`. The class must implement `row_args` for BorderBox row
+    #   #   arguments and render its own content.
+    #   # @param system_arguments [Hash] forwarded to `component_klass` or
+    #   #   `Primer::Beta::BorderBox#with_row`.
+    #   def with_item(component_klass: Item, **system_arguments, &block)
+    #   end
+    #
+    # @!parse
+    #   # Adds an empty-state content row with `data-empty-list-item="true"`.
+    #   #
+    #   # @param system_arguments [Hash] forwarded to `Primer::Beta::BorderBox#with_row`.
+    #   def with_empty_item(**system_arguments, &block)
+    #   end
+    renders_many :items, types: {
+      item: {
+        renders: ->(component_klass: Item, **system_arguments) {
+          component_klass.new(**system_arguments)
+        },
+        as: :item
+      },
+      empty_item: {
+        renders: ->(**system_arguments) {
+          EmptyItem.new(**system_arguments)
+        },
+        as: :empty_item
+      }
+    }
+
+    # @!parse
+    #   # Gets the configured list items.
+    #   #
+    #   # This is intentionally public so wrapper components can delegate item
+    #   # access while keeping underlying BorderBox rows as an internal detail.
+    #   #
+    #   # @return [Array<ViewComponent::Slot>]
+    #   def items
+    #   end
+
+    # @!parse
+    #   # Adds a footer below the list body.
+    #   #
+    #   # When the parent BorderBox has a `list_id`, the footer receives a
+    #   # stable default id derived from that list id unless an explicit id is
+    #   # provided.
+    #   #
+    #   # @param system_arguments [Hash] forwarded to `Footer`, whose
+    #   #   `footer_args` are forwarded to `Primer::Beta::BorderBox#with_footer`.
+    #   def with_footer(**system_arguments, &block)
+    #   end
+    renders_one :footer, ->(**system_arguments) {
+      system_arguments[:id] ||= dom_target(list_id, :footer) if list_id
+
+      Footer.new(**system_arguments)
+    }
+
+    # @param system_arguments [Hash] forwarded to `Primer::Beta::BorderBox`.
+    def initialize(**system_arguments)
+      super()
+
+      @system_arguments = system_arguments
+    end
+
+    def before_render
+      content
+      apply_header_defaults!
+    end
+
+    def render?
+      header? || items.any? || footer?
+    end
+
+    private
+
+    def apply_header_defaults!
+      return unless header?
+
+      header.collapsible_id = [list_id, footer_id].compact.join(" ")
+    end
+
+    def list_id
+      @system_arguments[:list_id]
+    end
+
+    def footer_id
+      footer&.id
+    end
+  end
+end
diff --git a/app/components/op_primer/border_box_list_component.sass b/app/components/op_primer/border_box_list_component.sass
@@ -0,0 +1,34 @@
+//-- copyright
+// OpenProject is an open source project management software.
+// Copyright (C) the OpenProject GmbH
+//
+// This program is free software; you can redistribute it and/or
+// modify it under the terms of the GNU General Public License version 3.
+//
+// See COPYRIGHT and LICENSE files for more details.
+//++
+
+.op-border-box-list-header
+  display: grid
+  grid-template-columns: 1fr minmax(5rem, max-content) auto
+  grid-template-areas: "collapsible actions menu"
+  align-items: center
+
+  &--actions,
+  &--menu
+    margin-left: var(--stack-gap-normal)
+    align-self: flex-start
+    // Unfortunately, the invisible button style bites us here again.
+    margin-top: -6px
+
+.op-border-box-list-item
+  display: grid
+  grid-template-columns: minmax(0, 1fr) auto
+  align-items: start
+  gap: var(--stack-gap-normal)
+
+  &--content
+    min-width: 0
+
+  &--menu
+    margin-top: -6px
diff --git a/...package_card_list_component/empty_item.rb → ...r/border_box_list_component/empty_item.rb b/...package_card_list_component/empty_item.rb → ...r/border_box_list_component/empty_item.rb
@@ -23,28 +23,33 @@
 #
 # You should have received a copy of the GNU General Public License
 # along with this program; if not, write to the Free Software
-# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 #
 # See COPYRIGHT and LICENSE files for more details.
 #++
 
-module OpenProject
-  module Common
-    class WorkPackageCardListComponent
-      # Row bridge for caller-provided empty content.
-      class EmptyItem < ContentItem
-        include Primer::AttributesHelper
+module OpPrimer
+  class BorderBoxListComponent
+    class EmptyItem < ApplicationComponent
+      include Primer::AttributesHelper
 
-        def row_args
-          system_arguments = @system_arguments.deep_dup
-          system_arguments[:data] = merge_data(
-            { data: { empty_list_item: true } },
-            system_arguments
-          )
+      def initialize(**system_arguments)
+        super()
+
+        @system_arguments = system_arguments
+      end
+
+      def row_args
+        system_arguments = @system_arguments.deep_dup
+        system_arguments[:data] = merge_data(
+          { data: { empty_list_item: true } },
           system_arguments
-        end
+        )
+        system_arguments
+      end
 
-        def empty_item? = true
+      def call
+        content
       end
     end
   end

diff --git a/...ckage_card_list_component/content_item.rb → ...rimer/border_box_list_component/footer.rb b/...ckage_card_list_component/content_item.rb → ...rimer/border_box_list_component/footer.rb
@@ -23,35 +23,29 @@
 #
 # You should have received a copy of the GNU General Public License
 # along with this program; if not, write to the Free Software
-# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 #
 # See COPYRIGHT and LICENSE files for more details.
 #++
 
-module OpenProject
-  module Common
-    class WorkPackageCardListComponent
-      # Item bridge for caller-provided content.
-      class ContentItem < ApplicationComponent
-        def initialize(**system_arguments)
-          super()
+module OpPrimer
+  class BorderBoxListComponent
+    class Footer < ApplicationComponent
+      attr_reader :id
 
-          @system_arguments = system_arguments
-        end
+      def initialize(**system_arguments)
+        super()
 
-        def row_args
-          @system_arguments.deep_dup
-        end
-
-        def card
-          self
-        end
+        @id = system_arguments[:id]
+        @system_arguments = system_arguments
+      end
 
-        def empty_item? = false
+      def footer_args
+        @system_arguments.deep_dup
+      end
 
-        def call
-          content
-        end
+      def call
+        content
       end
     end
   end