1 files changed, 232 insertions, 0 deletions
diff --git a/src/silx/gui/qt/_qt.py b/src/silx/gui/qt/_qt.py
new file mode 100644
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+++ b/src/silx/gui/qt/_qt.py
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+# coding: utf-8
+# /*##########################################################################
+#
+# Copyright (c) 2004-2021 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.
+#
+# ###########################################################################*/
+"""Load Qt binding"""
+
+__authors__ = ["V.A. Sole"]
+__license__ = "MIT"
+__date__ = "23/05/2018"
+
+
+import logging
+import sys
+import traceback
+
+
+_logger = logging.getLogger(__name__)
+
+
+BINDING = None
+"""The name of the Qt binding in use: PyQt5, PySide2, PySide6."""
+
+QtBinding = None  # noqa
+"""The Qt binding module in use: PyQt5, PySide2, PySide6."""
+
+HAS_SVG = False
+"""True if Qt provides support for Scalable Vector Graphics (QtSVG)."""
+
+HAS_OPENGL = False
+"""True if Qt provides support for OpenGL (QtOpenGL)."""
+
+# First check for an already loaded wrapper
+for _binding in ('PySide2', 'PyQt5', 'PySide6'):
+    if _binding + '.QtCore' in sys.modules:
+        BINDING = _binding
+        break
+else:  # Then try Qt bindings
+    try:
+        import PyQt5.QtCore  # noqa
+    except ImportError:
+        if 'PyQt5' in sys.modules:
+            del sys.modules["PyQt5"]
+        try:
+            import PySide2.QtCore  # noqa
+        except ImportError:
+            if 'PySide2' in sys.modules:
+                del sys.modules["PySide2"]
+            try:
+                import PySide6.QtCore  # noqa
+            except ImportError:
+                if 'PySide6' in sys.modules:
+                    del sys.modules["PySide6"]
+                raise ImportError(
+                    'No Qt wrapper found. Install PyQt5, PySide2, PySide6.')
+            else:
+                BINDING = 'PySide6'
+        else:
+            BINDING = 'PySide2'
+    else:
+        BINDING = 'PyQt5'
+
+
+if BINDING == 'PyQt5':
+    _logger.debug('Using PyQt5 bindings')
+
+    import PyQt5 as QtBinding  # noqa
+
+    from PyQt5.QtCore import *  # noqa
+    from PyQt5.QtGui import *  # noqa
+    from PyQt5.QtWidgets import *  # noqa
+    from PyQt5.QtPrintSupport import *  # noqa
+
+    try:
+        from PyQt5.QtOpenGL import *  # noqa
+    except ImportError:
+        _logger.info("PyQt5.QtOpenGL not available")
+        HAS_OPENGL = False
+    else:
+        HAS_OPENGL = True
+
+    try:
+        from PyQt5.QtSvg import *  # noqa
+    except ImportError:
+        _logger.info("PyQt5.QtSvg not available")
+        HAS_SVG = False
+    else:
+        HAS_SVG = True
+
+    from PyQt5.uic import loadUi  # noqa
+
+    Signal = pyqtSignal
+
+    Property = pyqtProperty
+
+    Slot = pyqtSlot
+
+    # Disable PyQt5's cooperative multi-inheritance since other bindings do not provide it.
+    # See https://www.riverbankcomputing.com/static/Docs/PyQt5/multiinheritance.html?highlight=inheritance
+    class _Foo(object): pass
+    class QObject(QObject, _Foo): pass
+
+
+elif BINDING == 'PySide2':
+    _logger.debug('Using PySide2 bindings')
+
+    import PySide2 as QtBinding  # noqa
+
+    from PySide2.QtCore import *  # noqa
+    from PySide2.QtGui import *  # noqa
+    from PySide2.QtWidgets import *  # noqa
+    from PySide2.QtPrintSupport import *  # noqa
+
+    try:
+        from PySide2.QtOpenGL import *  # noqa
+    except ImportError:
+        _logger.info("PySide2.QtOpenGL not available")
+        HAS_OPENGL = False
+    else:
+        HAS_OPENGL = True
+
+    try:
+        from PySide2.QtSvg import *  # noqa
+    except ImportError:
+        _logger.info("PySide2.QtSvg not available")
+        HAS_SVG = False
+    else:
+        HAS_SVG = True
+
+    pyqtSignal = Signal
+
+    # Qt6 compatibility:
+    # with PySide2 `exec` method has a special behavior
+    class _ExecMixIn:
+        """Mix-in class providind `exec` compatibility"""
+        def exec(self, *args, **kwargs):
+            return super().exec_(*args, **kwargs)
+
+    # QtWidgets
+    class QApplication(_ExecMixIn, QApplication): pass
+    class QColorDialog(_ExecMixIn, QColorDialog): pass
+    class QDialog(_ExecMixIn, QDialog): pass
+    class QErrorMessage(_ExecMixIn, QErrorMessage): pass
+    class QFileDialog(_ExecMixIn, QFileDialog): pass
+    class QFontDialog(_ExecMixIn, QFontDialog): pass
+    class QInputDialog(_ExecMixIn, QInputDialog): pass
+    class QMenu(_ExecMixIn, QMenu): pass
+    class QMessageBox(_ExecMixIn, QMessageBox): pass
+    class QProgressDialog(_ExecMixIn, QProgressDialog): pass
+    #QtCore
+    class QCoreApplication(_ExecMixIn, QCoreApplication): pass
+    class QEventLoop(_ExecMixIn, QEventLoop): pass
+    if hasattr(QTextStreamManipulator, "exec_"):
+        # exec_ only wrapped in PySide2 and NOT in PyQt5
+        class QTextStreamManipulator(_ExecMixIn, QTextStreamManipulator): pass
+    class QThread(_ExecMixIn, QThread): pass
+
+
+elif BINDING == 'PySide6':
+    _logger.debug('Using PySide6 bindings')
+
+    import PySide6 as QtBinding  # noqa
+
+    from PySide6.QtCore import *  # noqa
+    from PySide6.QtGui import *  # noqa
+    from PySide6.QtWidgets import *  # noqa
+    from PySide6.QtPrintSupport import *  # noqa
+
+    try:
+        from PySide6.QtOpenGL import *  # noqa
+        from PySide6.QtOpenGLWidgets import QOpenGLWidget  # noqa
+    except ImportError:
+        _logger.info("PySide6.QtOpenGL not available")
+        HAS_OPENGL = False
+    else:
+        HAS_OPENGL = True
+
+    try:
+        from PySide6.QtSvg import *  # noqa
+    except ImportError:
+        _logger.info("PySide6.QtSvg not available")
+        HAS_SVG = False
+    else:
+        HAS_SVG = True
+
+    pyqtSignal = Signal
+
+else:
+    raise ImportError('No Qt wrapper found. Install PyQt5, PySide2 or PySide6')
+
+
+# provide a exception handler but not implement it by default
+def exceptionHandler(type_, value, trace):
+    """
+    This exception handler prevents quitting to the command line when there is
+    an unhandled exception while processing a Qt signal.
+
+    The script/application willing to use it should implement code similar to:
+
+    .. code-block:: python
+
+        if __name__ == "__main__":
+            sys.excepthook = qt.exceptionHandler
+
+    """
+    _logger.error("%s %s %s", type_, value, ''.join(traceback.format_tb(trace)))
+    msg = QMessageBox()
+    msg.setWindowTitle("Unhandled exception")
+    msg.setIcon(QMessageBox.Critical)
+    msg.setInformativeText("%s %s\nPlease report details" % (type_, value))
+    msg.setDetailedText(("%s " % value) + ''.join(traceback.format_tb(trace)))
+    msg.raise_()
+    msg.exec()