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# coding: utf-8
# /*##########################################################################
#
# Copyright (c) 2017-2018 European Synchrotron Radiation Facility
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
# THE SOFTWARE.
#
# ###########################################################################*/
"""This module provides convenient functions about Qt events.
"""
__authors__ = ["V. Valls"]
__license__ = "MIT"
__date__ = "16/10/2020"
from silx.gui import qt
from silx.gui.utils import concurrent
import logging
import types
_logger = logging.getLogger(__name__)
class SimulatedSignal:
"""
Simulated signal to create signal at runtime.
.. codeauthor:: Abstract Factory <hello@pipi.io>
.. note:: Code from http://abstractfactory.io/blog/dynamic-signals-in-pyqt/
"""
def __init__(self):
self.__subscribers = []
def subs(self):
return self.__subscribers
def emit(self, *args, **kwargs):
for subs in self.__subscribers:
subs(*args, **kwargs)
def connect(self, func):
self.__subscribers.append(func)
def disconnect(self, func):
try:
self.__subscribers.remove(func)
except ValueError:
_logger.error('Warning: function %s not removed from signal %s', func, self)
def createCloseSignal(widget):
"""
Create a Qt close signal to the widget as sigClosed attribute
:type widget: Qt.QWidget
"""
if hasattr(widget, "sigClosed"):
if isinstance(widget.sigClosed, SimulatedSignal):
return
raise Exception("Attribute sigClose already exists and is not a Qt signal")
def closeEvent(self, event):
widget.sigClosed.emit()
self._createCloseSignal_oldCloseEvent(event)
widget.sigClosed = SimulatedSignal()
widget._createCloseSignal_oldCloseEvent = widget.closeEvent
widget.closeEvent = types.MethodType(closeEvent, widget)
def createShowSignal(widget):
"""
Create a Qt shown signal to the widget as sigShown attribute
:type widget: Qt.QWidget
"""
if hasattr(widget, "sigShown"):
if isinstance(widget.sigShown, SimulatedSignal):
return
raise Exception("Attribute sigClose already exists and is not a Qt signal")
def showEvent(self, event):
widget.sigShown.emit()
self._createShowSignal_oldShowEvent(event)
widget.sigShown = SimulatedSignal()
widget._createShowSignal_oldShowEvent = widget.showEvent
widget.showEvent = types.MethodType(showEvent, widget)
def createHideSignal(widget):
"""
Create a Qt hidden signal to the widget as sigHidden attribute
:type widget: Qt.QWidget
"""
if hasattr(widget, "sigHidden"):
if isinstance(widget.sigHidden, SimulatedSignal):
return
raise Exception("Attribute sigClose already exists and is not a Qt signal")
def hideEvent(self, event):
widget.sigHidden.emit()
self._createHideSignal_oldHideEvent(event)
widget.sigHidden = SimulatedSignal()
widget._createHideSignal_oldHideEvent = widget.hideEvent
widget.hideEvent = types.MethodType(hideEvent, widget)
class QtProxifier(qt.QObject):
"""Provide a safe Qt object from an unsafe object."""
_callRequested = qt.Signal(str, tuple, dict)
def __init__(self, target):
qt.QObject.__init__(self)
self.__target = target
self._callRequested.connect(self.__callRequested)
def _target(self):
return self.__target
def __getattr__(self, name):
"""Convert a call request to a Qt signal"""
def createSignal(*args, **kwargs):
method = getattr(self.__target, name)
result = concurrent.submitToQtMainThread(method, *args, **kwargs)
return result
return createSignal
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