logger_level_widget.py

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import os
import rospkg

from python_qt_binding import loadUi
from python_qt_binding.QtCore import qWarning
from python_qt_binding.QtWidgets import QWidget


class LoggerLevelWidget(QWidget):

    """
    Widget for use with LoggerLevelServiceCaller class to alter the ROS logger levels
    """

    def __init__(self, caller):
        """
        :param caller:
            service caller instance for sending service calls, ''LoggerLevelServiceCaller''
        """
        super(LoggerLevelWidget, self).__init__()
        rp = rospkg.RosPack()
        ui_file = os.path.join(rp.get_path('rqt_logger_level'), 'resource', 'logger_level.ui')
        loadUi(ui_file, self)
        self.setObjectName('LoggerLevelWidget')
        self._caller = caller

        self.node_list.currentRowChanged[int].connect(self.node_changed)
        self.logger_list.currentRowChanged[int].connect(self.logger_changed)
        self.level_list.currentRowChanged[int].connect(self.level_changed)
        self.refresh_button.clicked[bool].connect(self.refresh_nodes)

        self.refresh_nodes()
        if self.node_list.count() > 0:
            self.node_list.setCurrentRow(0)

    def refresh_nodes(self):
        """
        Refreshes the top level node list and repoulates the node_list widget.
        As a side effect the level and logger lists are cleared
        """
        self.level_list.clear()
        self.logger_list.clear()
        self.node_list.clear()
        for name in self._caller.get_node_names():
            self.node_list.addItem(name)

    def node_changed(self, row):
        """
        Handles the rowchanged event for the node_list widget
        Populates logger_list with the loggers for the node selected
        :param row: the selected row in node_list, ''int''
        """
        if row == -1:
            return
        if row < 0 or row >= self.node_list.count():
            qWarning('Node row %s out of bounds. Current count: %s' % (row, self.node_list.count()))
            return
        self.logger_list.clear()
        self.level_list.clear()
        loggers = self._caller.get_loggers(self.node_list.item(row).text())
        if len(loggers) == 0:
            return
        for logger in sorted(loggers):
            self.logger_list.addItem(logger)
        if self.logger_list.count() != 0:
            self.logger_list.setCurrentRow(0)

    def logger_changed(self, row):
        """
        Handles the rowchanged event for the logger_list widget
        Populates level_list with the levels for the logger selected
        :param row: the selected row in logger_list, ''int''
        """
        if row == -1:
            return
        if row < 0 or row >= self.logger_list.count():
            qWarning('Logger row %s out of bounds. Current count: %s' %
                     (row, self.logger_list.count()))
            return
        if self.level_list.count() == 0:
            for level in self._caller.get_levels():
                self.level_list.addItem(level)
        for index in range(self.level_list.count()):
            if self.level_list.item(index).text().lower() == \
                    self._caller._current_levels[self.logger_list.currentItem().text()].lower():
                self.level_list.setCurrentRow(index)

    def level_changed(self, row):
        """
        Handles the rowchanged event for the level_list widget
        Makes a service call to change the logger level for the indicated node/logger to the
        selected value
        :param row: the selected row in level_list, ''int''
        """
        if row == -1:
            return
        if row < 0 or row >= self.level_list.count():
            qWarning('Level row %s out of bounds. Current count: %s' %
                     (row, self.level_list.count()))
            return
        self._caller.send_logger_change_message(
            self.node_list.currentItem().text(),
            self.logger_list.currentItem().text(),
            self.level_list.item(row).text())