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"""This module provides a singleton QPrinter used by default by silx widgets.
"""

__authors__ = ["T. Vincent"]
__license__ = "MIT"
__date__ = "01/03/2018"


from . import qt


_printer = None
"""Shared QPrinter instance"""


def getDefaultPrinter():
    """Returns the default printer.

    This allows reusing the same QPrinter across widgets.

    :return: QPrinter
    """
    global _printer
    if _printer is None:
        _printer = qt.QPrinter()
    return _printer


def setDefaultPrinter(printer):
    """Set the printer used by default by silx widgets.

    :param QPrinter printer:
    """
    assert isinstance(printer, qt.QPrinter)
    global _printer
    _printer = printer
