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# (C) Copyright 2005-2023 Enthought, Inc., Austin, TX
# All rights reserved.
#
# This software is provided without warranty under the terms of the BSD
# license included in LICENSE.txt and may be redistributed only under
# the conditions described in the aforementioned license. The license
# is also available online at http://www.enthought.com/licenses/BSD.txt
#
# Thanks for using Enthought open source!
""" A cached image list. """
import wx
from .image_resource import ImageResource
# fixme: rename to 'CachedImageList'?!?
class ImageList(wx.ImageList):
""" A cached image list. """
def __init__(self, width, height):
""" Creates a new cached image list. """
# Base-class constructor.
wx.ImageList.__init__(self, width, height)
self._width = width
self._height = height
# Cache of the indexes of the images in the list!
self._cache = {} # {filename : index}
return
# ------------------------------------------------------------------------
# 'ImageList' interface.
# ------------------------------------------------------------------------
def GetIndex(self, filename):
""" Returns the index of the specified image.
The image will be loaded and added to the image list if it is not
already there.
"""
# Try the cache first.
index = self._cache.get(filename)
if index is None:
# Were we passed an image resource?
if isinstance(filename, ImageResource):
# Create an image.
image = filename.create_image(size=(self._width, self._height))
# If the filename is a string then it is the filename of some kind
# of image (e.g 'foo.gif', 'image/foo.png' etc).
elif isinstance(filename, str):
# Load the image from the file.
image = wx.Image(filename, wx.BITMAP_TYPE_ANY)
# Otherwise the filename is *actually* an icon (in our case,
# probably related to a MIME type).
else:
# Create a bitmap from the icon.
bmp = wx.Bitmap(self._width, self._height)
bmp.CopyFromIcon(filename)
# Turn it into an image so that we can scale it.
image = wx.ImageFromBitmap(bmp)
# We force all images in the cache to be the same size.
self._scale(image)
# We also force them to be bitmaps!
bmp = image.ConvertToBitmap()
# Add the bitmap to the actual list...
index = self.Add(bmp)
# ... and update the cache.
self._cache[filename] = index
return index
# ------------------------------------------------------------------------
# Private interface.
# ------------------------------------------------------------------------
def _scale(self, image):
""" Scales the specified image (if necessary). """
if (
image.GetWidth() != self._width
or image.GetHeight() != self._height
):
image.Rescale(self._width, self._height)
return image
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