mirror of https://github.com/evilhero/mylar
71 lines
2.2 KiB
Python
71 lines
2.2 KiB
Python
"""A PyQT4 class to load a page image from a ComicArchive in a background thread"""
|
|
|
|
# Copyright 2012-2014 Anthony Beville
|
|
|
|
# Licensed under the Apache License, Version 2.0 (the "License");
|
|
# you may not use this file except in compliance with the License.
|
|
# You may obtain a copy of the License at
|
|
|
|
# http://www.apache.org/licenses/LICENSE-2.0
|
|
|
|
# Unless required by applicable law or agreed to in writing, software
|
|
# distributed under the License is distributed on an "AS IS" BASIS,
|
|
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
# See the License for the specific language governing permissions and
|
|
# limitations under the License.
|
|
|
|
from PyQt4 import QtCore, QtGui, uic
|
|
from PyQt4.QtCore import pyqtSignal
|
|
|
|
from comictaggerlib.ui.qtutils import getQImageFromData
|
|
#from comicarchive import ComicArchive
|
|
#import utils
|
|
|
|
|
|
class PageLoader(QtCore.QThread):
|
|
|
|
"""
|
|
This class holds onto a reference of each instance in a list since
|
|
problems occur if the ref count goes to zero and the GC tries to reap
|
|
the object while the thread is going.
|
|
If the client class wants to stop the thread, they should mark it as
|
|
"abandoned", and no signals will be issued.
|
|
"""
|
|
|
|
loadComplete = pyqtSignal(QtGui.QImage)
|
|
|
|
instanceList = []
|
|
mutex = QtCore.QMutex()
|
|
|
|
# Remove all finished threads from the list
|
|
@staticmethod
|
|
def reapInstances():
|
|
for obj in reversed(PageLoader.instanceList):
|
|
if obj.isFinished():
|
|
PageLoader.instanceList.remove(obj)
|
|
|
|
def __init__(self, ca, page_num):
|
|
QtCore.QThread.__init__(self)
|
|
self.ca = ca
|
|
self.page_num = page_num
|
|
self.abandoned = False
|
|
|
|
# remove any old instances, and then add ourself
|
|
PageLoader.mutex.lock()
|
|
PageLoader.reapInstances()
|
|
PageLoader.instanceList.append(self)
|
|
PageLoader.mutex.unlock()
|
|
|
|
def run(self):
|
|
image_data = self.ca.getPage(self.page_num)
|
|
if self.abandoned:
|
|
return
|
|
|
|
if image_data is not None:
|
|
img = getQImageFromData(image_data)
|
|
|
|
if self.abandoned:
|
|
return
|
|
|
|
self.loadComplete.emit(img)
|