time_filter_widget.py

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from datetime import datetime
import os

from python_qt_binding import loadUi
from python_qt_binding.QtCore import QDateTime
from python_qt_binding.QtGui import QWidget


class TimeFilterWidget(QWidget):
    def __init__(self, parentfilter, display_list_args):
        """
        Widget for displaying interactive data related to time filtering.
        :param parentfilter: buddy filter were data is stored, ''TimeFilter''
        :param display_list_args: single element list containing one tuple with
        the min and max time to be displayed, ''list of tuple''
        """
        super(TimeFilterWidget, self).__init__()
        ui_file = os.path.join(os.path.dirname(os.path.realpath(__file__)), 'time_filter_widget.ui')
        loadUi(ui_file, self)
        self.setObjectName('TimeFilterWidget')
        self._parentfilter = parentfilter  # When data is changed it is stored in the parent filter

        self.start_datetime.dateTimeChanged[QDateTime].connect(self.handle_start_changed)
        self.stop_datetime.dateTimeChanged[QDateTime].connect(self.handle_stop_changed)
        self.stop_enabled_check_box.clicked[bool].connect(self.handle_stop_enabled_changed)

        # Times are passed in unixtimestamp '.' decimal fraction of a second
        mintime, maxtime = display_list_args[0]()
        if mintime != -1:
            mintime = str(mintime).split('.')
            maxtime = str(maxtime).split('.')

            time = QDateTime()
            time.setTime_t(int(mintime[0]))
            mintime = time.addMSecs(int(str(mintime[1]).zfill(9)[:3]))
            self.start_datetime.setDateTime(mintime)
            time.setTime_t(int(maxtime[0]))
            maxtime = time.addMSecs(int(str(maxtime[1]).zfill(9)[:3]))
            self.stop_datetime.setDateTime(maxtime)
        else:
            self.start_datetime.setDateTime(datetime.now())
            self.stop_datetime.setDateTime(datetime.now())

    def handle_start_changed(self, datetime_):
        self._parentfilter.set_start_time(datetime_)

    def handle_stop_changed(self, datetime_):
        self._parentfilter.set_stop_time(datetime_)

    def handle_stop_enabled_changed(self, checked):
        self._parentfilter.set_stop_time_enabled(checked)
        self.stop_datetime.setEnabled(checked)

    def repopulate(self):
        """
        Stub function.
        If the widget had any dynamically adjustable data it would requery it
        in this function.
        """
        pass

    def save_settings(self, settings):
        """
        Saves the settings for this filter to an ini file.
        :param settings: used to write the settings to an ini file ''qt_gui.settings.Settings''
        """
        settings.set_value('start_time', self._parentfilter._start_time.toString('hh:mm:ss.zzz (yyyy-MM-dd)'))
        settings.set_value('stop_time', self._parentfilter._stop_time.toString('hh:mm:ss.zzz (yyyy-MM-dd)'))
        settings.set_value('stop_time_enabled', self._parentfilter._stop_time_enabled)

    def restore_settings(self, settings):
        """
        Restores the settings for this filter from an ini file.
        :param settings: used to extract the settings from an ini file ''qt_gui.settings.Settings''
        """
        self.handle_stop_enabled_changed(settings.value('stop_time_enabled') in [True, 'true'])
        if settings.contains('start_time'):
            self.handle_start_changed(QDateTime.fromString(settings.value('start_time'), 'hh:mm:ss.zzz (yyyy-MM-dd)'))
        else:
            self.handle_start_changed(QDateTime(datetime.now()))
        if settings.contains('stop_time'):
            self.handle_stop_changed(QDateTime.fromString(settings.value('stop_time'), 'hh:mm:ss.zzz (yyyy-MM-dd)'))
        else:
            self.handle_stop_changed(QDateTime(datetime.now()))

        self.stop_datetime.setDateTime(self._parentfilter._stop_time)
        self.start_datetime.setDateTime(self._parentfilter._start_time)
        self.stop_enabled_check_box.setChecked(self._parentfilter._stop_time_enabled)