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# /*##########################################################################
#
# Copyright (c) 2017 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 handling of :class:`PlotWidget` limits history.
"""
__authors__ = ["T. Vincent"]
__license__ = "MIT"
__date__ = "19/07/2017"
from .. import qt
class LimitsHistory(qt.QObject):
"""Class handling history of limits of a :class:`PlotWidget`.
:param PlotWidget parent: The plot widget this object is bound to.
"""
def __init__(self, parent):
self._history = []
super(LimitsHistory, self).__init__(parent)
self.setParent(parent)
def setParent(self, parent):
"""See :meth:`QObject.setParent`.
:param PlotWidget parent: The PlotWidget this object is bound to.
"""
self.clear() # Clear history when changing parent
super(LimitsHistory, self).setParent(parent)
def push(self):
"""Append current limits to the history."""
plot = self.parent()
xmin, xmax = plot.getXAxis().getLimits()
ymin, ymax = plot.getYAxis(axis="left").getLimits()
y2min, y2max = plot.getYAxis(axis="right").getLimits()
self._history.append((xmin, xmax, ymin, ymax, y2min, y2max))
def pop(self):
"""Restore previously limits stored in the history.
:return: True if limits were restored, False if history was empty.
:rtype: bool
"""
plot = self.parent()
if self._history:
limits = self._history.pop(-1)
plot.setLimits(*limits)
return True
else:
plot.resetZoom()
return False
def clear(self):
"""Clear stored limits states."""
self._history = []
def __len__(self):
return len(self._history)
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