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# ##### 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 #####
# <pep8-80 compliant>
import bpy, nodeitems_utils
from bpy.types import Operator, PropertyGroup
from bpy.props import BoolProperty, CollectionProperty, EnumProperty, IntProperty, StringProperty
class NodeSetting(PropertyGroup):
value = StringProperty(
name="Value",
description="Python expression to be evaluated as the initial node setting",
default="",
)
# Base class for node 'Add' operators
class NodeAddOperator():
type = StringProperty(
name="Node Type",
description="Node type",
)
use_transform = BoolProperty(
name="Use Transform",
description="Start transform operator after inserting the node",
default=False,
)
settings = CollectionProperty(
name="Settings",
description="Settings to be applied on the newly created node",
type=NodeSetting,
options={'SKIP_SAVE'},
)
@staticmethod
def store_mouse_cursor(context, event):
space = context.space_data
v2d = context.region.view2d
tree = space.edit_tree
# convert mouse position to the View2D for later node placement
if context.region.type == 'WINDOW':
space.cursor_location = v2d.region_to_view(event.mouse_region_x,
event.mouse_region_y)
else:
space.cursor_location = tree.view_center
# XXX explicit node_type argument is usually not necessary, but required to make search operator work:
# add_search has to override the 'type' property since it's hardcoded in bpy_operator_wrap.c ...
def create_node(self, context, node_type=None):
space = context.space_data
tree = space.edit_tree
if node_type is None:
node_type = self.type
# select only the new node
for n in tree.nodes:
n.select = False
node = tree.nodes.new(type=node_type)
for setting in self.settings:
# XXX catch exceptions here?
value = eval(setting.value)
try:
setattr(node, setting.name, value)
except AttributeError as e:
self.report({'ERROR_INVALID_INPUT'}, "Node has no attribute "+setting.name)
print (str(e))
# Continue despite invalid attribute
if space.use_hidden_preview:
node.show_preview = False
node.select = True
tree.nodes.active = node
node.location = space.cursor_location
return node
@classmethod
def poll(cls, context):
space = context.space_data
# needs active node editor and a tree to add nodes to
return (space.type == 'NODE_EDITOR' and space.edit_tree)
# Default execute simply adds a node
def execute(self, context):
self.create_node(context)
return {'FINISHED'}
# Default invoke stores the mouse position to place the node correctly
# and optionally invokes the transform operator
def invoke(self, context, event):
self.store_mouse_cursor(context, event)
result = self.execute(context)
if self.use_transform and ('FINISHED' in result):
bpy.ops.transform.translate('INVOKE_DEFAULT')
return result
# Simple basic operator for adding a node
class NODE_OT_add_node(NodeAddOperator, Operator):
'''Add a node to the active tree'''
bl_idname = "node.add_node"
bl_label = "Add Node"
bl_options = {'REGISTER', 'UNDO'}
# Add a node and link it to an existing socket
class NODE_OT_add_and_link_node(NodeAddOperator, Operator):
'''Add a node to the active tree and link to an existing socket'''
bl_idname = "node.add_and_link_node"
bl_label = "Add and Link Node"
bl_options = {'REGISTER', 'UNDO'}
link_socket_index = IntProperty(
name="Link Socket Index",
description="Index of the socket to link",
)
def execute(self, context):
space = context.space_data
ntree = space.edit_tree
node = self.create_node(context)
if not node:
return {'CANCELLED'}
to_socket = getattr(context, "link_to_socket", None)
if to_socket:
ntree.links.new(node.outputs[self.link_socket_index], to_socket)
from_socket = getattr(context, "link_from_socket", None)
if from_socket:
ntree.links.new(from_socket, node.inputs[self.link_socket_index])
return {'FINISHED'}
class NODE_OT_add_search(NodeAddOperator, Operator):
'''Add a node to the active tree'''
bl_idname = "node.add_search"
bl_label = "Search and Add Node"
bl_options = {'REGISTER', 'UNDO'}
# Create an enum list from node items
def node_enum_items(self, context):
enum_items = []
for index, item in enumerate(nodeitems_utils.node_items_iter(context)):
nodetype = getattr(bpy.types, item.nodetype, None)
if nodetype:
enum_items.append((str(index), item.label, nodetype.bl_rna.description, index))
return enum_items
# Look up the item based on index
def find_node_item(self, context):
for index, item in enumerate(nodeitems_utils.node_items_iter(context)):
if str(index) == self.type:
return item
return None
# XXX this should be called 'node_item' but the operator search
# property is hardcoded to 'type' by a hack in bpy_operator_wrap.c ...
type = EnumProperty(
name="Node Type",
description="Node type",
items=node_enum_items,
)
def execute(self, context):
item = self.find_node_item(context)
if item:
# apply settings from the node item
for setting in item.settings.items():
ops = self.settings.add()
ops.name = setting[0]
ops.value = setting[1]
self.create_node(context, item.nodetype)
if self.use_transform:
bpy.ops.transform.translate('INVOKE_DEFAULT')
return {'FINISHED'}
else:
return {'CANCELLED'}
def invoke(self, context, event):
self.store_mouse_cursor(context, event)
# Delayed execution in the search popup
context.window_manager.invoke_search_popup(self)
return {'CANCELLED'}
class NODE_OT_collapse_hide_unused_toggle(Operator):
'''Toggle collapsed nodes and hide unused sockets'''
bl_idname = "node.collapse_hide_unused_toggle"
bl_label = "Collapse and Hide Unused Sockets"
bl_options = {'REGISTER', 'UNDO'}
@classmethod
def poll(cls, context):
space = context.space_data
# needs active node editor and a tree
return (space.type == 'NODE_EDITOR' and space.edit_tree)
def execute(self, context):
space = context.space_data
tree = space.edit_tree
for node in tree.nodes:
if node.select:
hide = (not node.hide)
node.hide = hide
# Note: connected sockets are ignored internally
for socket in node.inputs:
socket.hide = hide
for socket in node.outputs:
socket.hide = hide
return {'FINISHED'}
class NODE_OT_tree_path_parent(Operator):
'''Go to parent node tree'''
bl_idname = "node.tree_path_parent"
bl_label = "Parent Node Tree"
bl_options = {'REGISTER', 'UNDO'}
@classmethod
def poll(cls, context):
space = context.space_data
# needs active node editor and a tree
return (space.type == 'NODE_EDITOR' and len(space.path) > 1)
def execute(self, context):
space = context.space_data
space.path.pop()
return {'FINISHED'}
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