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Diffstat (limited to 'silx/gui/plot/LimitsHistory.py')
-rw-r--r-- | silx/gui/plot/LimitsHistory.py | 83 |
1 files changed, 83 insertions, 0 deletions
diff --git a/silx/gui/plot/LimitsHistory.py b/silx/gui/plot/LimitsHistory.py new file mode 100644 index 0000000..a323548 --- /dev/null +++ b/silx/gui/plot/LimitsHistory.py @@ -0,0 +1,83 @@ +# coding: utf-8 +# /*########################################################################## +# +# 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) |