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blender-archive/release/scripts/startup/bl_ui/space_filebrowser.py
Julian Eisel 62cb5c5c4a Enable Asset Browser by default for poses, rest stays experimental
Idea for 3.0 is to disable all functionality that isn't well polished
and focus on those parts first. Starting with poses.

* Adds a new experimental option "Extended Asset Browser", replacing
  "Asset Browser".
* Unlike the previous option, this isn't enabled by default anymore.
  This didn't work well in practice and caused plenty of confusion.
* "Mark as Asset" and "Clear Asset" are hidden if the option is
  disabled.
* Same for the category selection in the Asset Browser.
* Always show display the "Only Assets" option in the File Browser while
  browing inside .blend files. That way you can hide data-blocks that
  are not pose assets.
* The Asset Library setup UI in the Preferences is always visible now,
  it's needed for pose library access.

Addresses T90181, T90180 and T90300.

Differential Revision: https://developer.blender.org/D12120
2021-08-11 14:32:07 +02:00

821 lines
26 KiB
Python

# ##### 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 #####
# <pep8 compliant>
import bpy
from bpy.types import Header, Panel, Menu, UIList
from bpy_extras import (
asset_utils,
)
class FILEBROWSER_HT_header(Header):
bl_space_type = 'FILE_BROWSER'
def draw_asset_browser_buttons(self, context):
layout = self.layout
space_data = context.space_data
params = space_data.params
row = layout.row(align=True)
row.prop(params, "asset_library_ref", text="")
# External libraries don't auto-refresh, add refresh button.
if params.asset_library_ref != 'LOCAL':
row.operator("file.refresh", text="", icon='FILE_REFRESH')
layout.separator_spacer()
layout.prop(params, "import_type", text="")
layout.separator_spacer()
# Uses prop_with_popover() as popover() only adds the triangle icon in headers.
layout.prop_with_popover(
params,
"display_type",
panel="ASSETBROWSER_PT_display",
text="",
icon_only=True,
)
layout.prop(params, "filter_search", text="", icon='VIEWZOOM')
layout.operator(
"screen.region_toggle",
text="",
icon='PREFERENCES',
depress=is_option_region_visible(context, space_data)
).region_type = 'TOOL_PROPS'
def draw(self, context):
from bpy_extras.asset_utils import SpaceAssetInfo
layout = self.layout
space_data = context.space_data
if space_data.active_operator is None:
layout.template_header()
if SpaceAssetInfo.is_asset_browser(space_data):
ASSETBROWSER_MT_editor_menus.draw_collapsible(context, layout)
layout.separator()
self.draw_asset_browser_buttons(context)
else:
FILEBROWSER_MT_editor_menus.draw_collapsible(context, layout)
layout.separator_spacer()
if not context.screen.show_statusbar:
layout.template_running_jobs()
class FileBrowserPanel:
bl_space_type = 'FILE_BROWSER'
@classmethod
def poll(cls, context):
space_data = context.space_data
# can be None when save/reload with a file selector open
if space_data.params is None:
return False
return space_data and space_data.type == 'FILE_BROWSER' and space_data.browse_mode == 'FILES'
class FILEBROWSER_PT_display(FileBrowserPanel, Panel):
bl_region_type = 'HEADER'
bl_label = "Display Settings" # Shows as tooltip in popover
bl_ui_units_x = 10
def draw(self, context):
layout = self.layout
space = context.space_data
params = space.params
layout.use_property_split = True
layout.use_property_decorate = False # No animation.
if params.display_type == 'THUMBNAIL':
layout.prop(params, "display_size", text="Size")
else:
col = layout.column(heading="Columns", align=True)
col.prop(params, "show_details_size", text="Size")
col.prop(params, "show_details_datetime", text="Date")
layout.prop(params, "recursion_level", text="Recursions")
layout.column().prop(params, "sort_method", text="Sort By", expand=True)
layout.prop(params, "use_sort_invert")
class FILEBROWSER_PT_filter(FileBrowserPanel, Panel):
bl_region_type = 'HEADER'
bl_label = "Filter Settings" # Shows as tooltip in popover
bl_ui_units_x = 8
def draw(self, context):
layout = self.layout
space = context.space_data
params = space.params
is_lib_browser = params.use_library_browsing
col = layout.column()
col.active = params.use_filter
row = col.row()
row.label(icon='FILE_FOLDER')
row.prop(params, "use_filter_folder", text="Folders", toggle=False)
if params.filter_glob:
col.label(text=params.filter_glob)
else:
row = col.row()
row.label(icon='FILE_BLEND')
row.prop(params, "use_filter_blender",
text=".blend Files", toggle=False)
row = col.row()
row.label(icon='FILE_BACKUP')
row.prop(params, "use_filter_backup",
text="Backup .blend Files", toggle=False)
row = col.row()
row.label(icon='FILE_IMAGE')
row.prop(params, "use_filter_image", text="Image Files", toggle=False)
row = col.row()
row.label(icon='FILE_MOVIE')
row.prop(params, "use_filter_movie", text="Movie Files", toggle=False)
row = col.row()
row.label(icon='FILE_SCRIPT')
row.prop(params, "use_filter_script",
text="Script Files", toggle=False)
row = col.row()
row.label(icon='FILE_FONT')
row.prop(params, "use_filter_font", text="Font Files", toggle=False)
row = col.row()
row.label(icon='FILE_SOUND')
row.prop(params, "use_filter_sound", text="Sound Files", toggle=False)
row = col.row()
row.label(icon='FILE_TEXT')
row.prop(params, "use_filter_text", text="Text Files", toggle=False)
row = col.row()
row.label(icon='FILE_VOLUME')
row.prop(params, "use_filter_volume", text="Volume Files", toggle=False)
col.separator()
if is_lib_browser:
row = col.row()
row.label(icon='BLANK1') # Indentation
row.prop(params, "use_filter_blendid",
text="Blender IDs", toggle=False)
if params.use_filter_blendid:
row = col.row()
row.label(icon='BLANK1') # Indentation
sub = row.column(align=True)
if context.preferences.experimental.use_extended_asset_browser:
sub.prop(params, "use_filter_asset_only")
filter_id = params.filter_id
for identifier in dir(filter_id):
if identifier.startswith("category_"):
sub.prop(filter_id, identifier, toggle=True)
col.separator()
layout.prop(params, "show_hidden")
def panel_poll_is_upper_region(region):
# The upper region is left-aligned, the lower is split into it then.
# Note that after "Flip Regions" it's right-aligned.
return region.alignment in {'LEFT', 'RIGHT'}
def panel_poll_is_asset_browsing(context):
from bpy_extras.asset_utils import SpaceAssetInfo
return SpaceAssetInfo.is_asset_browser_poll(context)
class FILEBROWSER_UL_dir(UIList):
def draw_item(self, _context, layout, _data, item, icon, _active_data, _active_propname, _index):
direntry = item
# space = context.space_data
if self.layout_type in {'DEFAULT', 'COMPACT'}:
row = layout.row(align=True)
row.enabled = direntry.is_valid
# Non-editable entries would show grayed-out, which is bad in this specific case, so switch to mere label.
if direntry.is_property_readonly("name"):
row.label(text=direntry.name, icon_value=icon)
else:
row.prop(direntry, "name", text="", emboss=False, icon_value=icon)
elif self.layout_type == 'GRID':
layout.alignment = 'CENTER'
layout.prop(direntry, "path", text="")
class FILEBROWSER_PT_bookmarks_volumes(Panel):
bl_space_type = 'FILE_BROWSER'
bl_region_type = 'TOOLS'
bl_category = "Bookmarks"
bl_label = "Volumes"
@classmethod
def poll(cls, context):
return panel_poll_is_upper_region(context.region) and not panel_poll_is_asset_browsing(context)
def draw(self, context):
layout = self.layout
space = context.space_data
if space.system_folders:
row = layout.row()
row.template_list("FILEBROWSER_UL_dir", "system_folders", space, "system_folders",
space, "system_folders_active", item_dyntip_propname="path", rows=1, maxrows=10)
class FILEBROWSER_PT_bookmarks_system(Panel):
bl_space_type = 'FILE_BROWSER'
bl_region_type = 'TOOLS'
bl_category = "Bookmarks"
bl_label = "System"
@classmethod
def poll(cls, context):
return (
not context.preferences.filepaths.hide_system_bookmarks and
panel_poll_is_upper_region(context.region) and
not panel_poll_is_asset_browsing(context)
)
def draw(self, context):
layout = self.layout
space = context.space_data
if space.system_bookmarks:
row = layout.row()
row.template_list("FILEBROWSER_UL_dir", "system_bookmarks", space, "system_bookmarks",
space, "system_bookmarks_active", item_dyntip_propname="path", rows=1, maxrows=10)
class FILEBROWSER_MT_bookmarks_context_menu(Menu):
bl_label = "Bookmarks Specials"
def draw(self, _context):
layout = self.layout
layout.operator("file.bookmark_cleanup", icon='X', text="Cleanup")
layout.separator()
layout.operator("file.bookmark_move", icon='TRIA_UP_BAR',
text="Move to Top").direction = 'TOP'
layout.operator("file.bookmark_move", icon='TRIA_DOWN_BAR',
text="Move to Bottom").direction = 'BOTTOM'
class FILEBROWSER_PT_bookmarks_favorites(FileBrowserPanel, Panel):
bl_space_type = 'FILE_BROWSER'
bl_region_type = 'TOOLS'
bl_category = "Bookmarks"
bl_label = "Favorites"
@classmethod
def poll(cls, context):
return (
panel_poll_is_upper_region(context.region) and
not panel_poll_is_asset_browsing(context)
)
def draw(self, context):
layout = self.layout
space = context.space_data
if space.bookmarks:
row = layout.row()
num_rows = len(space.bookmarks)
row.template_list("FILEBROWSER_UL_dir", "bookmarks", space, "bookmarks",
space, "bookmarks_active", item_dyntip_propname="path",
rows=(2 if num_rows < 2 else 4), maxrows=10)
col = row.column(align=True)
col.operator("file.bookmark_add", icon='ADD', text="")
col.operator("file.bookmark_delete", icon='REMOVE', text="")
col.menu("FILEBROWSER_MT_bookmarks_context_menu",
icon='DOWNARROW_HLT', text="")
if num_rows > 1:
col.separator()
col.operator("file.bookmark_move", icon='TRIA_UP',
text="").direction = 'UP'
col.operator("file.bookmark_move", icon='TRIA_DOWN',
text="").direction = 'DOWN'
else:
layout.operator("file.bookmark_add", icon='ADD')
class FILEBROWSER_PT_bookmarks_recents(Panel):
bl_space_type = 'FILE_BROWSER'
bl_region_type = 'TOOLS'
bl_category = "Bookmarks"
bl_label = "Recent"
@classmethod
def poll(cls, context):
return (
not context.preferences.filepaths.hide_recent_locations and
panel_poll_is_upper_region(context.region) and
not panel_poll_is_asset_browsing(context)
)
def draw(self, context):
layout = self.layout
space = context.space_data
if space.recent_folders:
row = layout.row()
row.template_list("FILEBROWSER_UL_dir", "recent_folders", space, "recent_folders",
space, "recent_folders_active", item_dyntip_propname="path", rows=1, maxrows=10)
col = row.column(align=True)
col.operator("file.reset_recent", icon='X', text="")
class FILEBROWSER_PT_advanced_filter(Panel):
bl_space_type = 'FILE_BROWSER'
bl_region_type = 'TOOLS'
bl_category = "Filter"
bl_label = "Advanced Filter"
@classmethod
def poll(cls, context):
# only useful in append/link (library) context currently...
return (
context.space_data.params and
context.space_data.params.use_library_browsing and
panel_poll_is_upper_region(context.region) and
not panel_poll_is_asset_browsing(context)
)
def draw(self, context):
layout = self.layout
space = context.space_data
params = space.params
layout.prop(params, "use_filter_blendid")
if params.use_filter_blendid:
layout.separator()
col = layout.column(align=True)
col.prop(params, "use_filter_asset_only")
filter_id = params.filter_id
for identifier in dir(filter_id):
if identifier.startswith("filter_"):
col.prop(filter_id, identifier, toggle=True)
def is_option_region_visible(context, space):
if not space.active_operator:
return False
for region in context.area.regions:
if region.type == 'TOOL_PROPS' and region.width <= 1:
return False
return True
class FILEBROWSER_PT_directory_path(Panel):
bl_space_type = 'FILE_BROWSER'
bl_region_type = 'UI'
bl_label = "Directory Path"
bl_category = "Attributes"
bl_options = {'HIDE_HEADER'}
def is_header_visible(self, context):
for region in context.area.regions:
if region.type == 'HEADER' and region.height <= 1:
return False
return True
@classmethod
def poll(cls, context):
return context.space_data.params
def draw(self, context):
layout = self.layout
space = context.space_data
params = space.params
layout.scale_x = 1.3
layout.scale_y = 1.3
row = layout.row()
flow = row.grid_flow(row_major=True, columns=0, even_columns=False, even_rows=False, align=False)
subrow = flow.row()
subsubrow = subrow.row(align=True)
subsubrow.operator("file.previous", text="", icon='BACK')
subsubrow.operator("file.next", text="", icon='FORWARD')
subsubrow.operator("file.parent", text="", icon='FILE_PARENT')
subsubrow.operator("file.refresh", text="", icon='FILE_REFRESH')
subsubrow = subrow.row()
subsubrow.operator_context = 'EXEC_DEFAULT'
subsubrow.operator("file.directory_new", icon='NEWFOLDER', text="")
subrow.template_file_select_path(params)
subrow = flow.row()
subsubrow = subrow.row()
subsubrow.scale_x = 0.6
subsubrow.prop(params, "filter_search", text="", icon='VIEWZOOM')
subsubrow = subrow.row(align=True)
subsubrow.prop(params, "display_type", expand=True, icon_only=True)
subsubrow.popover("FILEBROWSER_PT_display", text="")
subsubrow = subrow.row(align=True)
subsubrow.prop(params, "use_filter", toggle=True, icon='FILTER', icon_only=True)
subsubrow.popover("FILEBROWSER_PT_filter", text="")
if space.active_operator:
subrow.operator(
"screen.region_toggle",
text="",
icon='PREFERENCES',
depress=is_option_region_visible(context, space)
).region_type = 'TOOL_PROPS'
class FileBrowserMenu:
@classmethod
def poll(cls, context):
space_data = context.space_data
return space_data and space_data.type == 'FILE_BROWSER' and space_data.browse_mode == 'FILES'
class FILEBROWSER_MT_editor_menus(FileBrowserMenu, Menu):
bl_idname = "FILEBROWSER_MT_editor_menus"
bl_label = ""
def draw(self, _context):
layout = self.layout
layout.menu("FILEBROWSER_MT_view")
layout.menu("FILEBROWSER_MT_select")
class FILEBROWSER_MT_view(FileBrowserMenu, Menu):
bl_label = "View"
def draw(self, context):
layout = self.layout
st = context.space_data
params = st.params
layout.prop(st, "show_region_toolbar", text="Source List")
layout.prop(st, "show_region_ui", text="File Path")
layout.operator("file.view_selected")
layout.separator()
layout.prop_menu_enum(params, "display_size")
layout.prop_menu_enum(params, "recursion_level")
layout.separator()
layout.menu("INFO_MT_area")
class FILEBROWSER_MT_select(FileBrowserMenu, Menu):
bl_label = "Select"
def draw(self, _context):
layout = self.layout
layout.operator("file.select_all", text="All").action = 'SELECT'
layout.operator("file.select_all", text="None").action = 'DESELECT'
layout.operator("file.select_all", text="Inverse").action = 'INVERT'
layout.separator()
layout.operator("file.select_box")
class FILEBROWSER_MT_context_menu(FileBrowserMenu, Menu):
bl_label = "Files Context Menu"
def draw(self, context):
layout = self.layout
st = context.space_data
params = st.params
layout.operator("file.previous", text="Back")
layout.operator("file.next", text="Forward")
layout.operator("file.parent", text="Go to Parent")
layout.operator("file.refresh", text="Refresh")
layout.separator()
layout.operator("file.filenum", text="Increase Number",
icon='ADD').increment = 1
layout.operator("file.filenum", text="Decrease Number",
icon='REMOVE').increment = -1
layout.separator()
layout.operator("file.rename", text="Rename")
sub = layout.row()
sub.operator_context = 'EXEC_DEFAULT'
sub.operator("file.delete", text="Delete")
layout.separator()
sub = layout.row()
sub.operator_context = 'EXEC_DEFAULT'
sub.operator("file.directory_new", text="New Folder")
layout.operator("file.bookmark_add", text="Add Bookmark")
layout.separator()
layout.prop_menu_enum(params, "display_type")
if params.display_type == 'THUMBNAIL':
layout.prop_menu_enum(params, "display_size")
layout.prop_menu_enum(params, "recursion_level", text="Recursions")
layout.prop_menu_enum(params, "sort_method")
class ASSETBROWSER_PT_display(asset_utils.AssetBrowserPanel, Panel):
bl_region_type = 'HEADER'
bl_label = "Display Settings" # Shows as tooltip in popover
bl_ui_units_x = 10
def draw(self, context):
layout = self.layout
space = context.space_data
params = space.params
layout.use_property_split = True
layout.use_property_decorate = False # No animation.
if params.display_type == 'THUMBNAIL':
layout.prop(params, "display_size", text="Size")
else:
col = layout.column(heading="Columns", align=True)
col.prop(params, "show_details_size", text="Size")
col.prop(params, "show_details_datetime", text="Date")
class AssetBrowserMenu:
@classmethod
def poll(cls, context):
from bpy_extras.asset_utils import SpaceAssetInfo
return SpaceAssetInfo.is_asset_browser_poll(context)
class ASSETBROWSER_MT_editor_menus(AssetBrowserMenu, Menu):
bl_idname = "ASSETBROWSER_MT_editor_menus"
bl_label = ""
def draw(self, _context):
layout = self.layout
layout.menu("ASSETBROWSER_MT_view")
layout.menu("ASSETBROWSER_MT_select")
class ASSETBROWSER_MT_view(AssetBrowserMenu, Menu):
bl_label = "View"
def draw(self, context):
layout = self.layout
st = context.space_data
params = st.params
layout.prop(st, "show_region_toolbar", text="Source List")
layout.prop(st, "show_region_tool_props", text="Asset Details")
layout.operator("file.view_selected")
layout.separator()
layout.prop_menu_enum(params, "display_size")
layout.separator()
layout.menu("INFO_MT_area")
class ASSETBROWSER_MT_select(AssetBrowserMenu, Menu):
bl_label = "Select"
def draw(self, _context):
layout = self.layout
layout.operator("file.select_all", text="All").action = 'SELECT'
layout.operator("file.select_all", text="None").action = 'DESELECT'
layout.operator("file.select_all", text="Inverse").action = 'INVERT'
layout.separator()
layout.operator("file.select_box")
class ASSETBROWSER_PT_navigation_bar(asset_utils.AssetBrowserPanel, Panel):
bl_label = "Asset Navigation"
bl_region_type = 'TOOLS'
bl_options = {'HIDE_HEADER'}
@classmethod
def poll(cls, context):
return context.preferences.experimental.use_extended_asset_browser
def draw(self, context):
layout = self.layout
space_file = context.space_data
col = layout.column()
col.scale_x = 1.3
col.scale_y = 1.3
col.prop(space_file.params, "asset_category", expand=True)
class ASSETBROWSER_PT_metadata(asset_utils.AssetBrowserPanel, Panel):
bl_region_type = 'TOOL_PROPS'
bl_label = "Asset Metadata"
bl_options = {'HIDE_HEADER'}
def draw(self, context):
layout = self.layout
asset_file_handle = context.asset_file_handle
if asset_file_handle is None:
layout.label(text="No asset selected", icon='INFO')
return
asset_library_ref = context.asset_library_ref
asset_lib_path = bpy.types.AssetHandle.get_full_library_path(asset_file_handle, asset_library_ref)
if asset_file_handle.local_id:
# If the active file is an ID, use its name directly so renaming is possible from right here.
layout.prop(asset_file_handle.local_id, "name", text="")
row = layout.row()
row.label(text="Source: Current File")
else:
layout.prop(asset_file_handle, "name", text="")
col = layout.column(align=True) # Just to reduce margin.
col.label(text="Source:")
row = col.row()
row.label(text=asset_lib_path)
row.operator("asset.open_containing_blend_file", text="", icon='TOOL_SETTINGS')
class ASSETBROWSER_PT_metadata_preview(asset_utils.AssetMetaDataPanel, Panel):
bl_label = "Preview"
def draw(self, context):
layout = self.layout
active_file = context.active_file
row = layout.row()
box = row.box()
box.template_icon(icon_value=active_file.preview_icon_id, scale=5.0)
if bpy.ops.ed.lib_id_load_custom_preview.poll():
col = row.column(align=True)
col.operator("ed.lib_id_load_custom_preview", icon='FILEBROWSER', text="")
col.separator()
col.operator("ed.lib_id_generate_preview", icon='FILE_REFRESH', text="")
class ASSETBROWSER_PT_metadata_details(asset_utils.AssetMetaDataPanel, Panel):
bl_label = "Details"
def draw(self, context):
layout = self.layout
active_asset = asset_utils.SpaceAssetInfo.get_active_asset(context)
layout.use_property_split = True
if active_asset:
layout.prop(active_asset, "description")
class ASSETBROWSER_PT_metadata_tags(asset_utils.AssetMetaDataPanel, Panel):
bl_label = "Tags"
def draw(self, context):
layout = self.layout
asset_data = asset_utils.SpaceAssetInfo.get_active_asset(context)
row = layout.row()
row.template_list("ASSETBROWSER_UL_metadata_tags", "asset_tags", asset_data, "tags",
asset_data, "active_tag", rows=4)
col = row.column(align=True)
col.operator("asset.tag_add", icon='ADD', text="")
col.operator("asset.tag_remove", icon='REMOVE', text="")
class ASSETBROWSER_UL_metadata_tags(UIList):
def draw_item(self, _context, layout, _data, item, icon, _active_data, _active_propname, _index):
tag = item
row = layout.row(align=True)
# Non-editable entries would show grayed-out, which is bad in this specific case, so switch to mere label.
if tag.is_property_readonly("name"):
row.label(text=tag.name, icon_value=icon)
else:
row.prop(tag, "name", text="", emboss=False, icon_value=icon)
class ASSETBROWSER_MT_context_menu(AssetBrowserMenu, Menu):
bl_label = "Assets Context Menu"
def draw(self, context):
layout = self.layout
st = context.space_data
params = st.params
layout.operator("file.refresh", text="Refresh")
layout.separator()
sub = layout.row()
sub.operator_context = 'EXEC_DEFAULT'
sub.operator("asset.clear", text="Clear Asset")
layout.separator()
layout.operator("asset.open_containing_blend_file")
layout.separator()
if params.display_type == 'THUMBNAIL':
layout.prop_menu_enum(params, "display_size")
classes = (
FILEBROWSER_HT_header,
FILEBROWSER_PT_display,
FILEBROWSER_PT_filter,
FILEBROWSER_UL_dir,
FILEBROWSER_PT_bookmarks_volumes,
FILEBROWSER_PT_bookmarks_system,
FILEBROWSER_MT_bookmarks_context_menu,
FILEBROWSER_PT_bookmarks_favorites,
FILEBROWSER_PT_bookmarks_recents,
FILEBROWSER_PT_advanced_filter,
FILEBROWSER_PT_directory_path,
FILEBROWSER_MT_editor_menus,
FILEBROWSER_MT_view,
FILEBROWSER_MT_select,
FILEBROWSER_MT_context_menu,
ASSETBROWSER_PT_display,
ASSETBROWSER_MT_editor_menus,
ASSETBROWSER_MT_view,
ASSETBROWSER_MT_select,
ASSETBROWSER_PT_navigation_bar,
ASSETBROWSER_PT_metadata,
ASSETBROWSER_PT_metadata_preview,
ASSETBROWSER_PT_metadata_details,
ASSETBROWSER_PT_metadata_tags,
ASSETBROWSER_UL_metadata_tags,
ASSETBROWSER_MT_context_menu,
)
if __name__ == "__main__": # only for live edit.
from bpy.utils import register_class
for cls in classes:
register_class(cls)