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# for http://blender.stackexchange.com/questions/44886/search-enum-list

bl_info = {
    "name": "Search Popup",
    "version": (0, 0, 1),
    "blender": (2, 75, 0),
    "category": "Test"
}

import bpy

from bpy.props import (EnumProperty,
                       PointerProperty,
                       )
from bpy.types import (Operator,
                       AddonPreferences,
                       PropertyGroup,
                       )


# ------------------------------------------------------------------------
#    store properties in the active scene
# ------------------------------------------------------------------------

def my_callback(scene, context):
    mat_cids = ([o for o in bpy.data.materials['Material'].keys() ])
    return [(y.upper(), y, "", x) for x, y in enumerate(mat_cids)]


class MySettings(PropertyGroup):

    objs = EnumProperty(
        name="Objects",
        description="",
        items=my_callback
        )

# ------------------------------------------------------------------------
#    operator
# ------------------------------------------------------------------------

class MyOperator(Operator):
    """Tooltip"""
    bl_idname = "object.search_popup"
    bl_label = "Search Popup"
    bl_property = "my_enum"

    my_enum = MySettings.objs

    def execute(self, context):
        self.report({'INFO'}, "You've selected: %s" % self.my_enum)
        return {'FINISHED'}

    def invoke(self, context, event):
        wm = context.window_manager
        wm.invoke_search_popup(self)
        return {'FINISHED'}

# ------------------------------------------------------------------------
# register and unregister functions
# ------------------------------------------------------------------------

def register():
    bpy.utils.register_module(__name__)
    bpy.types.Scene.my_tool = PointerProperty(type=MySettings)

def unregister():
    bpy.utils.unregister_module(__name__)
    del bpy.types.Scene.my_tool

if __name__ == "__main__":
    register()

    # test call
    bpy.ops.object.search_popup('INVOKE_DEFAULT')