UI - Custom Material #Blender

custom-material-ui.py

bl_info = {
    "name": "",
    "description": "",
    "author": "",
    "version": (0, 0, 1),
    "blender": (2, 70, 0),
    "location": "",
    "warning": "", 
    "wiki_url": "",
    "tracker_url": "",
    "category": ""
}

import bpy

from bpy.props import (StringProperty,
                       BoolProperty,
                       IntProperty,
                       FloatProperty,
                       FloatVectorProperty,
                       EnumProperty,
                       PointerProperty,
                       )
from bpy.types import (Panel,
                       Operator,
                       AddonPreferences,
                       PropertyGroup,
                       )
def find_node(material, nodetype):
    if material and material.node_tree:
        ntree = material.node_tree

        active_output_node = None
        for node in ntree.nodes:
            if getattr(node, "type", None) == nodetype:
                if getattr(node, "is_active_output", True):
                    return node
                if not active_output_node:
                    active_output_node = node
        return active_output_node

    return None

def find_node_input(node, name):
    for input in node.inputs:
        if input.name == name:
            return input

    return None

def panel_node_draw(layout, id_data, output_type, input_name):
    if not id_data.use_nodes:
        layout.operator("cycles.use_shading_nodes", icon='NODETREE')
        return False

    ntree = id_data.node_tree

    node = find_node(id_data, output_type)
    if not node:
        layout.label(text="No output node")
    else:
        input = find_node_input(node, input_name)
        layout.template_node_view(ntree, node, input)

    return True


class UV_OT_my_panel(Panel):
    bl_space_type = 'VIEW_3D'
    bl_idname = "UV_OT_my_panel"
    bl_label = "Custom"
    bl_category = "Custom"
    bl_region_type = 'TOOLS'

    def draw(self, context):
        layout = self.layout

        mat = bpy.context.object.material_slots[0].material
        if not panel_node_draw(layout, mat, 'OUTPUT_MATERIAL', 'Surface'):
            layout.prop(mat, "diffuse_color")


def register():
    bpy.utils.register_module(__name__)

def unregister():
    bpy.utils.unregister_module(__name__)

if __name__ == "__main__":
    register()