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[cuegui] Replace qApp with a new cuegui.App library. (#1193)
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# Copyright Contributors to the OpenCue Project | ||
# | ||
# 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. | ||
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"""Module for CueGUI's custom QApplication and associated helper functions.""" | ||
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from PySide2 import QtCore | ||
from PySide2 import QtWidgets | ||
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import cuegui.Exception | ||
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__QAPPLICATION_SINGLETON = None | ||
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class CueGuiApplication(QtWidgets.QApplication): | ||
"""The CueGUI application.""" | ||
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# Settings | ||
settings = None | ||
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# Global signals | ||
display_log_file_content = QtCore.Signal(object) | ||
double_click = QtCore.Signal(object) | ||
facility_changed = QtCore.Signal() | ||
single_click = QtCore.Signal(object) | ||
unmonitor = QtCore.Signal(object) | ||
view_hosts = QtCore.Signal(object) | ||
view_object = QtCore.Signal(object) | ||
view_procs = QtCore.Signal(object) | ||
request_update = QtCore.Signal() | ||
status = QtCore.Signal() | ||
quit = QtCore.Signal() | ||
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# Thread pool | ||
threadpool = None | ||
threads = [] | ||
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# Shutdown signal | ||
closingApp = False | ||
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def create_app(argv): | ||
""" | ||
Create an instance of the CueGUI application. | ||
:param argv: user-provided commandline arguments | ||
:type argv: list | ||
:return: the application instance | ||
:rtype: CueGuiApplication | ||
""" | ||
# pylint: disable=global-statement | ||
global __QAPPLICATION_SINGLETON | ||
if __QAPPLICATION_SINGLETON is None: | ||
__QAPPLICATION_SINGLETON = CueGuiApplication(argv) | ||
return __QAPPLICATION_SINGLETON | ||
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def app(): | ||
"""Returns the current application instance. | ||
:return: the current application instance | ||
:rtype: CueGuiApplication | ||
:raises: opencue.exception.ApplicationNotRunningException: the application has not been | ||
initialized yet | ||
""" | ||
if __QAPPLICATION_SINGLETON is None: | ||
raise cuegui.Exception.ApplicationNotRunningException() | ||
return __QAPPLICATION_SINGLETON |
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Original file line number | Diff line number | Diff line change |
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# Copyright Contributors to the OpenCue Project | ||
# | ||
# 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. | ||
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"""Custom exception classes for CueGUI application errors.""" | ||
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class CueGuiException(Exception): | ||
"""Base class for all CueGUI exceptions. | ||
Note that this class does NOT inherit from opencue.exception.CueException, so that error | ||
handling code can easily distinguish between API errors and CueGUI errors. | ||
""" | ||
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class ApplicationNotRunningException(CueGuiException): | ||
"""Raised when the CueGUI application has not been instantiated but is required to be.""" | ||
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default_message = ( | ||
'attempted to access the CueGUI application before cuegui.create_app() was called') | ||
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def __init__(self, message=None): | ||
if message is None: | ||
message = self.default_message | ||
super().__init__(message) |
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