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#------------------------------------------------------------------------------
# Copyright (c) 2007, Riverbank Computing Limited
# All rights reserved.
#
# This software is provided without warranty under the terms of the BSD license.
# However, when used with the GPL version of PyQt the additional terms described in the PyQt GPL exception also apply
#
# Author: Riverbank Computing Limited
# Description: <Enthought pyface package component>
#------------------------------------------------------------------------------
# Major package imports.
from pyface.qt import QtGui
# Enthought library imports.
from traits.api import HasTraits, provides
# Local imports.
from pyface.i_image_cache import IImageCache, MImageCache
@provides(IImageCache)
class ImageCache(MImageCache, HasTraits):
""" The toolkit specific implementation of an ImageCache. See the
IImageCache interface for the API documentation.
"""
###########################################################################
# 'object' interface.
###########################################################################
def __init__(self, width, height):
self._width = width
self._height = height
###########################################################################
# 'ImageCache' interface.
###########################################################################
def get_image(self, filename):
image = QtGui.QPixmapCache.find(filename)
if image is not None:
scaled = self._qt4_scale(image)
if scaled is not image:
# The Qt cache is application wide so we only keep the last
# size asked for.
QtGui.QPixmapCache.remove(filename);
QtGui.QPixmapCache.insert(filename, scaled)
else:
# Load the image from the file and add it to the cache.
image = QtGui.QPixmap(filename)
scaled = self._qt4_scale(image)
QtGui.QPixmapCache.insert(filename, scaled)
return scaled
# Qt doesn't distinguish between bitmaps and images.
get_bitmap = get_image
###########################################################################
# Private 'ImageCache' interface.
###########################################################################
def _qt4_scale(self, image):
""" Scales the given image if necessary. """
# Although Qt won't scale the image if it doesn't need to, it will make
# a deep copy which we don't need.
if image.width() != self._width or image.height()!= self._height:
image = image.scaled(self._width, self._height)
return image
#### EOF ######################################################################
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