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import os
import bpy

# We can store multiple preview collections here,
# however in this example we only store "main"
icon_collections = {}

icons_read = {
    'fp.png': 'free',
    'flp.png': 'full',
}


def register_icons():
    # Note that preview collections returned by bpy.utils.previews
    # are regular py objects - you can use them to store custom data.
    import bpy.utils.previews
    pcoll = bpy.utils.previews.new()

    # path to the folder where the icon is
    # the path is calculated relative to this py file inside the addon folder
    icons_dir = os.path.join(os.path.dirname(__file__), "thumbnails")

    # load a preview thumbnail of a file and store in the previews collection
    for ir in icons_read.keys():
        pcoll.load(icons_read[ir], os.path.join(icons_dir, ir), 'IMAGE')

    icon_collections["main"] = pcoll


def unregister_icons():
    for pcoll in icon_collections.values():
        bpy.utils.previews.remove(pcoll)
    icon_collections.clear()