Spreadsheet: new spreadsheet editor

This implements the MVP for the new spreadsheet editor (T85879). The functionality
is still very limited, but it proved to be useful already. A more complete picture
of where we want to go with the new editor can be found in T86279.

Supported features:
* Show point attributes of evaluated meshes (no original data, no other domains,
  no other geometry types, yet). Since only meshes are supported right now, the
  output of the Point Distribute is not shown, because it is a point cloud.
* Only show data for selected vertices when the mesh is in edit mode.
  Different parts of Blender keep track of selection state and original-indices with
  varying degrees of success. Therefore, when the selected-only filter is used, the
  result might be a bit confusing when using some modifiers or nodes. This will
  be improved in the future.
* All data is readonly. Since only evaluated data is displayed currently, it has to
  be readonly. However, this is not an inherent limitation of the spreadsheet editor.
  In the future editable data will be displayed as well.

Some boilerplate code for the new editor has been committed before in
rB9cb5f0a2282a7a84f7f8636b43a32bdc04b51cd5.

It would be good to let the spreadsheet editor mature for a couple of weeks as part
of the geometry nodes project. Then other modules are invited to show their own data
in the new editor!

Differential Revision: https://developer.blender.org/D10566

3 files changed, 66 insertions, 0 deletions

diff --git a/release/scripts/startup/bl_operators/__init__.py b/release/scripts/startup/bl_operators/__init__.py
index 7e6f14a0a51..078b32f5e2a 100644
--- a/release/scripts/startup/bl_operators/__init__.py
+++ b/release/scripts/startup/bl_operators/__init__.py
@@ -45,6 +45,7 @@ _modules = [
     "rigidbody",
     "screen_play_rendered_anim",
     "sequencer",
+    "spreadsheet",
     "userpref",
     "uvcalc_follow_active",
     "uvcalc_lightmap",
diff --git a/release/scripts/startup/bl_operators/spreadsheet.py b/release/scripts/startup/bl_operators/spreadsheet.py
new file mode 100644
index 00000000000..a2f9b2ad412
--- /dev/null
+++ b/release/scripts/startup/bl_operators/spreadsheet.py
@@ -0,0 +1,52 @@
+# ##### BEGIN GPL LICENSE BLOCK #####
+#
+#  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.
+#
+# ##### END GPL LICENSE BLOCK #####
+
+from __future__ import annotations
+
+import bpy
+
+class SPREADSHEET_OT_toggle_pin(bpy.types.Operator):
+    '''Turn on or off pinning'''
+    bl_idname = "spreadsheet.toggle_pin"
+    bl_label = "Toggle Pin"
+    bl_options = {'REGISTER', 'UNDO'}
+
+    @classmethod
+    def poll(cls, context):
+        space = context.space_data
+        return space and space.type == 'SPREADSHEET'
+
+    def execute(self, context):
+        space = context.space_data
+
+        if space.pinned_id:
+            space.pinned_id = None
+        else:
+            space.pinned_id = context.active_object
+
+        return {'FINISHED'}
+
+
+classes = (
+    SPREADSHEET_OT_toggle_pin,
+)
+
+if __name__ == "__main__":  # Only for live edit.
+    from bpy.utils import register_class
+    for cls in classes:
+        register_class(cls)
diff --git a/release/scripts/startup/bl_ui/space_spreadsheet.py b/release/scripts/startup/bl_ui/space_spreadsheet.py
index e433ead070c..1d124019ce8 100644
--- a/release/scripts/startup/bl_ui/space_spreadsheet.py
+++ b/release/scripts/startup/bl_ui/space_spreadsheet.py
@@ -28,6 +28,19 @@ class SPREADSHEET_HT_header(bpy.types.Header):
 
         layout.template_header()
 
+        pinned_id = space.pinned_id
+        used_id = pinned_id if pinned_id else context.active_object
+
+        if used_id:
+            layout.label(text=used_id.name, icon="OBJECT_DATA")
+
+        layout.operator("spreadsheet.toggle_pin", text="", icon='PINNED' if pinned_id else 'UNPINNED', emboss=False)
+
+        layout.separator_spacer()
+
+        if isinstance(used_id, bpy.types.Object) and used_id.mode == 'EDIT':
+            layout.prop(space, "show_only_selected", text="Selected Only")
+
 
 classes = (
     SPREADSHEET_HT_header,