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#
# Copyright © 2009- The Spyder Development Team
# Licensed under the terms of the MIT License
"""
Compatibility functions
"""
import sys
from . import (
PYQT5,
PYQT6,
PYSIDE2,
PYSIDE6,
)
from .QtWidgets import QFileDialog
TEXT_TYPES = (str,)
def is_text_string(obj):
"""Return True if `obj` is a text string, False if it is anything else,
like binary data."""
return isinstance(obj, str)
def to_text_string(obj, encoding=None):
"""Convert `obj` to (unicode) text string"""
if encoding is None:
return str(obj)
if isinstance(obj, str):
# In case this function is not used properly, this could happen
return obj
return str(obj, encoding)
# =============================================================================
# QVariant conversion utilities
# =============================================================================
PYQT_API_1 = False
def to_qvariant(obj=None): # analysis:ignore
"""Convert Python object to QVariant
This is a transitional function from PyQt API#1 (QVariant exist)
to PyQt API#2 and Pyside (QVariant does not exist)"""
return obj
def from_qvariant(qobj=None, pytype=None): # analysis:ignore
"""Convert QVariant object to Python object
This is a transitional function from PyQt API #1 (QVariant exist)
to PyQt API #2 and Pyside (QVariant does not exist)"""
return qobj
# =============================================================================
# Wrappers around QFileDialog static methods
# =============================================================================
def getexistingdirectory(
parent=None,
caption="",
basedir="",
options=QFileDialog.ShowDirsOnly,
):
"""Wrapper around QtGui.QFileDialog.getExistingDirectory static method
Compatible with PyQt >=v4.4 (API #1 and #2) and PySide >=v1.0"""
# Calling QFileDialog static method
if sys.platform == "win32":
# On Windows platforms: redirect standard outputs
_temp1, _temp2 = sys.stdout, sys.stderr
sys.stdout, sys.stderr = None, None
try:
result = QFileDialog.getExistingDirectory(
parent,
caption,
basedir,
options,
)
finally:
if sys.platform == "win32":
# On Windows platforms: restore standard outputs
sys.stdout, sys.stderr = _temp1, _temp2
if not is_text_string(result):
# PyQt API #1
result = to_text_string(result)
return result
def _qfiledialog_wrapper(
attr,
parent=None,
caption="",
basedir="",
filters="",
selectedfilter="",
options=None,
):
if options is None:
options = QFileDialog.Option(0)
func = getattr(QFileDialog, attr)
# Calling QFileDialog static method
if sys.platform == "win32":
# On Windows platforms: redirect standard outputs
_temp1, _temp2 = sys.stdout, sys.stderr
sys.stdout, sys.stderr = None, None
result = func(parent, caption, basedir, filters, selectedfilter, options)
if sys.platform == "win32":
# On Windows platforms: restore standard outputs
sys.stdout, sys.stderr = _temp1, _temp2
output, selectedfilter = result
# Always returns the tuple (output, selectedfilter)
return output, selectedfilter
def getopenfilename(
parent=None,
caption="",
basedir="",
filters="",
selectedfilter="",
options=None,
):
"""Wrapper around QtGui.QFileDialog.getOpenFileName static method
Returns a tuple (filename, selectedfilter) -- when dialog box is canceled,
returns a tuple of empty strings
Compatible with PyQt >=v4.4 (API #1 and #2) and PySide >=v1.0"""
return _qfiledialog_wrapper(
"getOpenFileName",
parent=parent,
caption=caption,
basedir=basedir,
filters=filters,
selectedfilter=selectedfilter,
options=options,
)
def getopenfilenames(
parent=None,
caption="",
basedir="",
filters="",
selectedfilter="",
options=None,
):
"""Wrapper around QtGui.QFileDialog.getOpenFileNames static method
Returns a tuple (filenames, selectedfilter) -- when dialog box is canceled,
returns a tuple (empty list, empty string)
Compatible with PyQt >=v4.4 (API #1 and #2) and PySide >=v1.0"""
return _qfiledialog_wrapper(
"getOpenFileNames",
parent=parent,
caption=caption,
basedir=basedir,
filters=filters,
selectedfilter=selectedfilter,
options=options,
)
def getsavefilename(
parent=None,
caption="",
basedir="",
filters="",
selectedfilter="",
options=None,
):
"""Wrapper around QtGui.QFileDialog.getSaveFileName static method
Returns a tuple (filename, selectedfilter) -- when dialog box is canceled,
returns a tuple of empty strings
Compatible with PyQt >=v4.4 (API #1 and #2) and PySide >=v1.0"""
return _qfiledialog_wrapper(
"getSaveFileName",
parent=parent,
caption=caption,
basedir=basedir,
filters=filters,
selectedfilter=selectedfilter,
options=options,
)
# =============================================================================
def isalive(obj):
"""Wrapper around sip.isdeleted and shiboken.isValid which tests whether
an object is currently alive."""
if PYQT5 or PYQT6:
from . import sip
return not sip.isdeleted(obj)
if PYSIDE2 or PYSIDE6:
from . import shiboken
return shiboken.isValid(obj)
return None
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