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Diffstat (limited to 'src/leap/bitmask/gui/statemachines.py')
| -rw-r--r-- | src/leap/bitmask/gui/statemachines.py | 223 |
1 files changed, 223 insertions, 0 deletions
diff --git a/src/leap/bitmask/gui/statemachines.py b/src/leap/bitmask/gui/statemachines.py new file mode 100644 index 00000000..c3dd5ed3 --- /dev/null +++ b/src/leap/bitmask/gui/statemachines.py @@ -0,0 +1,223 @@ +# -*- coding: utf-8 -*- +# statemachines.py +# Copyright (C) 2013 LEAP +# +# This program is free software: you can redistribute it and/or modify +# it under the terms of the GNU General Public License as published by +# the Free Software Foundation, either version 3 of the License, or +# (at your option) any later version. +# +# This program is distributed in the hope that it will be useful, +# but WITHOUT ANY WARRANTY; without even the implied warranty of +# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +# GNU General Public License for more details. +# +# You should have received a copy of the GNU General Public License +# along with this program. If not, see <http://www.gnu.org/licenses/>. +""" +State machines for the Bitmask app. +""" +import logging + +from PySide.QtCore import QStateMachine, QState +from PySide.QtCore import QObject + +from leap.bitmask.services import connections +from leap.common.check import leap_assert_type + +logger = logging.getLogger(__name__) + +_tr = QObject().tr + +# Indexes for the state dict +_ON = "on" +_OFF = "off" +_CON = "connecting" +_DIS = "disconnecting" + + +class IntermediateState(QState): + """ + Intermediate state that emits a custom signal on entry + """ + def __init__(self, signal): + """ + Initializer. + :param signal: the signal to be emitted on entry on this state. + :type signal: QtCore.QSignal + """ + super(IntermediateState, self).__init__() + self._signal = signal + + def onEntry(self, *args): + """ + Emits the signal on entry. + """ + logger.debug('IntermediateState entered. Emitting signal ...') + if self._signal is not None: + self._signal.emit() + + +class ConnectionMachineBuilder(object): + """ + Builder class for state machines made from LEAPConnections. + """ + def __init__(self, connection): + """ + :param connection: an instance of a concrete LEAPConnection + we will be building a state machine for. + :type connection: AbstractLEAPConnection + """ + self._conn = connection + leap_assert_type(self._conn, connections.AbstractLEAPConnection) + + def make_machine(self, button=None, action=None, label=None): + """ + Creates a statemachine associated with the passed controls. + + :param button: the switch button. + :type button: QPushButton + + :param action: the actionh that controls connection switch in a menu. + :type action: QAction + + :param label: the label that displays the connection state + :type label: QLabel + + :returns: a state machine + :rtype: QStateMachine + """ + machine = QStateMachine() + conn = self._conn + + states = self._make_states(button, action, label) + + # transitions: + + states[_OFF].addTransition( + conn.qtsigs.do_connect_signal, + states[_CON]) + + # * Clicking the buttons or actions transitions to the + # intermediate stage. + if button: + states[_OFF].addTransition( + button.clicked, + states[_CON]) + states[_ON].addTransition( + button.clicked, + states[_DIS]) + + if action: + states[_OFF].addTransition( + action.triggered, + states[_CON]) + states[_ON].addTransition( + action.triggered, + states[_DIS]) + + # * We transition to the completed stages when + # we receive the matching signal from the underlying + # conductor. + + states[_CON].addTransition( + conn.qtsigs.connected_signal, + states[_ON]) + states[_DIS].addTransition( + conn.qtsigs.disconnected_signal, + states[_OFF]) + + # * If we receive the connection_died, we transition + # to the off state + states[_ON].addTransition( + conn.qtsigs.connection_died_signal, + states[_OFF]) + + # adding states to the machine + for state in states.itervalues(): + machine.addState(state) + machine.setInitialState(states[_OFF]) + return machine + + def _make_states(self, button, action, label): + """ + Creates the four states for the state machine + + :param button: the switch button. + :type button: QPushButton + + :param action: the actionh that controls connection switch in a menu. + :type action: QAction + + :param label: the label that displays the connection state + :type label: QLabel + + :returns: a dict of states + :rtype: dict + """ + conn = self._conn + states = {} + + # TODO add tooltip + + # OFF State ---------------------- + off = QState() + off_label = _tr("Turn {0}").format( + conn.Connected.short_label) + if button: + off.assignProperty( + button, 'text', off_label) + off.assignProperty( + button, 'enabled', True) + if action: + off.assignProperty( + action, 'text', off_label) + off.setObjectName(_OFF) + states[_OFF] = off + + # CONNECTING State ---------------- + connecting = IntermediateState( + conn.qtsigs.connecting_signal) + on_label = _tr("Turn {0}").format( + conn.Disconnected.short_label) + if button: + connecting.assignProperty( + button, 'text', on_label) + connecting.assignProperty( + button, 'enabled', False) + if action: + connecting.assignProperty( + action, 'text', on_label) + connecting.assignProperty( + action, 'enabled', False) + connecting.setObjectName(_CON) + states[_CON] = connecting + + # ON State ------------------------ + on = QState() + if button: + on.assignProperty( + button, 'text', on_label) + on.assignProperty( + button, 'enabled', True) + if action: + on.assignProperty( + action, 'text', on_label) + on.assignProperty( + action, 'enabled', True) + # TODO set label for ON state + on.setObjectName(_ON) + states[_ON] = on + + # DISCONNECTING State ------------- + disconnecting = IntermediateState( + conn.qtsigs.disconnecting_signal) + if button: + disconnecting.assignProperty( + button, 'enabled', False) + # XXX complete disconnecting + # TODO disable button + disconnecting.setObjectName(_DIS) + states[_DIS] = disconnecting + + return states |