node_presets.py

   1 # ##### BEGIN GPL LICENSE BLOCK #####
   2 #
   3 #  This program is free software; you can redistribute it and/or
   4 #  modify it under the terms of the GNU General Public License
   5 #  as published by the Free Software Foundation; version 2
   6 #  of the License.
   7 #
   8 #  This program is distributed in the hope that it will be useful,
   9 #  but WITHOUT ANY WARRANTY; without even the implied warranty of
  10 #  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  11 #  GNU General Public License for more details.
  12 #
  13 #  You should have received a copy of the GNU General Public License
  14 #  along with this program; if not, write to the Free Software Foundation,
  15 #  Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  16 #
  17 # ##### END GPL LICENSE BLOCK #####
  18
  19 bl_info = {
  20     "name": "Node Presets",
  21     "description": "Useful and time-saving tools for node group workflow",
  22     "author": "Campbell Barton",
  23     "version": (1, 1),
  24     "blender": (2, 80, 0),
  25     "location": "Node Editors > Add > Template",
  26     "description": "Add node groups directly to the node editors",
  27     "warning": "",
  28     "doc_url": "{BLENDER_MANUAL_URL}/addons/node/node_presets.html",
  29     "category": "Node",
  30 }
  31
  32 import os
  33 import bpy
  34 from bpy.types import (
  35     Operator,
  36     Menu,
  37     AddonPreferences,
  38 )
  39
  40 from bpy.props import (
  41     StringProperty,
  42 )
  43
  44
  45 # -----------------------------------------------------------------------------
  46 # Node Adding Operator
  47
  48
  49 def node_center(context):
  50     from mathutils import Vector
  51     loc = Vector((0.0, 0.0))
  52     node_selected = context.selected_nodes
  53     if node_selected:
  54         for node in node_selected:
  55             loc += node.location
  56         loc /= len(node_selected)
  57     return loc
  58
  59
  60 def node_template_add(context, filepath, node_group, ungroup, report):
  61     """ Main function
  62     """
  63
  64     space = context.space_data
  65     node_tree = space.node_tree
  66     node_active = context.active_node
  67     node_selected = context.selected_nodes
  68
  69     if node_tree is None:
  70         report({'ERROR'}, "No node tree available")
  71         return
  72
  73     with bpy.data.libraries.load(filepath, link=False) as (data_from, data_to):
  74         assert(node_group in data_from.node_groups)
  75         data_to.node_groups = [node_group]
  76     node_group = data_to.node_groups[0]
  77
  78     # add node!
  79     center = node_center(context)
  80
  81     for node in node_tree.nodes:
  82         node.select = False
  83
  84     node_type_string = {
  85         "ShaderNodeTree": "ShaderNodeGroup",
  86         "CompositorNodeTree": "CompositorNodeGroup",
  87         "TextureNodeTree": "TextureNodeGroup",
  88     }[type(node_tree).__name__]
  89
  90     node = node_tree.nodes.new(type=node_type_string)
  91     node.node_tree = node_group
  92
  93     is_fail = (node.node_tree is None)
  94     if is_fail:
  95         report({'WARNING'}, "Incompatible node type")
  96
  97     node.select = True
  98     node_tree.nodes.active = node
  99     node.location = center
 100
 101     if is_fail:
 102         node_tree.nodes.remove(node)
 103     else:
 104         if ungroup:
 105             bpy.ops.node.group_ungroup()
 106
 107     # node_group.user_clear()
 108     # bpy.data.node_groups.remove(node_group)
 109
 110
 111 # -----------------------------------------------------------------------------
 112 # Node Template Prefs
 113
 114 def node_search_path(context):
 115     preferences = context.preferences
 116     addon_prefs = preferences.addons[__name__].preferences
 117     dirpath = addon_prefs.search_path
 118     return dirpath
 119
 120
 121 class NodeTemplatePrefs(AddonPreferences):
 122     bl_idname = __name__
 123
 124     search_path: StringProperty(
 125         name="Directory of blend files with node-groups",
 126         subtype='DIR_PATH',
 127     )
 128
 129     def draw(self, context):
 130         layout = self.layout
 131         layout.prop(self, "search_path")
 132
 133
 134 class NODE_OT_template_add(Operator):
 135     """Add a node template"""
 136     bl_idname = "node.template_add"
 137     bl_label = "Add node group template"
 138     bl_description = "Add node group template"
 139     bl_options = {'REGISTER', 'UNDO'}
 140
 141     filepath: StringProperty(
 142         subtype='FILE_PATH',
 143     )
 144     group_name: StringProperty()
 145
 146     def execute(self, context):
 147         node_template_add(context, self.filepath, self.group_name, True, self.report)
 148
 149         return {'FINISHED'}
 150
 151     def invoke(self, context, event):
 152         node_template_add(context, self.filepath, self.group_name, event.shift, self.report)
 153
 154         return {'FINISHED'}
 155
 156
 157 # -----------------------------------------------------------------------------
 158 # Node menu list
 159
 160 def node_template_cache(context, *, reload=False):
 161     dirpath = node_search_path(context)
 162
 163     if node_template_cache._node_cache_path != dirpath:
 164         reload = True
 165
 166     node_cache = node_template_cache._node_cache
 167     if reload:
 168         node_cache = []
 169     if node_cache:
 170         return node_cache
 171
 172     for fn in os.listdir(dirpath):
 173         if fn.endswith(".blend"):
 174             filepath = os.path.join(dirpath, fn)
 175             with bpy.data.libraries.load(filepath) as (data_from, data_to):
 176                 for group_name in data_from.node_groups:
 177                     if not group_name.startswith("_"):
 178                         node_cache.append((filepath, group_name))
 179
 180     node_template_cache._node_cache = node_cache
 181     node_template_cache._node_cache_path = dirpath
 182
 183     return node_cache
 184
 185
 186 node_template_cache._node_cache = []
 187 node_template_cache._node_cache_path = ""
 188
 189
 190 class NODE_MT_template_add(Menu):
 191     bl_label = "Node Template"
 192
 193     def draw(self, context):
 194         layout = self.layout
 195
 196         dirpath = node_search_path(context)
 197         if dirpath == "":
 198             layout.label(text="Set search dir in the addon-prefs")
 199             return
 200
 201         try:
 202             node_items = node_template_cache(context)
 203         except Exception as ex:
 204             node_items = ()
 205             layout.label(text=repr(ex), icon='ERROR')
 206
 207         for filepath, group_name in node_items:
 208             props = layout.operator(
 209                 NODE_OT_template_add.bl_idname,
 210                 text=group_name,
 211             )
 212             props.filepath = filepath
 213             props.group_name = group_name
 214
 215
 216 def add_node_button(self, context):
 217     self.layout.menu(
 218         NODE_MT_template_add.__name__,
 219         text="Template",
 220         icon='PLUGIN',
 221     )
 222
 223
 224 classes = (
 225     NODE_OT_template_add,
 226     NODE_MT_template_add,
 227     NodeTemplatePrefs
 228 )
 229
 230
 231 def register():
 232     for cls in classes:
 233         bpy.utils.register_class(cls)
 234
 235     bpy.types.NODE_MT_add.append(add_node_button)
 236
 237
 238 def unregister():
 239     for cls in classes:
 240         bpy.utils.unregister_class(cls)
 241
 242     bpy.types.NODE_MT_add.remove(add_node_button)
 243
 244
 245 if __name__ == "__main__":
 246     register()