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# Copyright 2018 The glTF-Blender-IO authors.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
import bpy
import typing
class Filter:
"""Base class for all node tree filter operations."""
def __call__(self, obj: bpy.types.Object):
return True
class ByName(Filter):
"""
Filter the objects by name.
example usage:
find_objects(FilterByName("Cube"))
"""
def __init__(self, name):
self.name = name
def __call__(self, obj: bpy.types.Object):
return obj.name == self.name
class ByDataType(Filter):
"""Filter the scene objects by their data type."""
def __init__(self, data_type: str):
self.type = data_type
def __call__(self, obj: bpy.types.Object):
return obj.type == self.type
class ByDataInstance(Filter):
"""Filter the scene objects by a specific ID instance."""
def __init__(self, data_instance: bpy.types.ID):
self.data = data_instance
def __call__(self, obj: bpy.types.Object):
return self.data == obj.data
def find_objects(object_filter: typing.Union[Filter, typing.Callable]):
"""
Find objects in the scene where the filter expression is true.
:param object_filter: should be a function(x: object) -> bool
:return: a list of shader nodes for which filter is true
"""
results = []
for obj in bpy.context.scene.objects:
if object_filter(obj):
results.append(obj)
return results
def find_objects_from(obj: bpy.types.Object, object_filter: typing.Union[Filter, typing.Callable]):
"""
Search for objects matching a filter function below a specified object.
:param obj: the starting point of the search
:param object_filter: a function(x: object) -> bool
:return: a list of objects which passed the filter
"""
results = []
if object_filter(obj):
results.append(obj)
for child in obj.children:
results += find_objects_from(child, object_filter)
return results
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