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/*
statemachinewatcher.cpp
This file is part of GammaRay, the Qt application inspection and manipulation tool.
SPDX-FileCopyrightText: 2010 Klarälvdalens Datakonsult AB, a KDAB Group company <info@kdab.com>
Author: Kevin Funk <kevin.funk@kdab.com>
SPDX-License-Identifier: GPL-2.0-or-later
Contact KDAB at <info@kdab.com> for commercial licensing options.
*/
#include "statemachinewatcher.h"
#include <QAbstractTransition>
#include <QFinalState>
#include <QState>
#include <QStateMachine>
#include <iostream>
using namespace GammaRay;
static State toState(QAbstractState *state = nullptr)
{
return State(reinterpret_cast<quintptr>(state));
}
static Transition toTransition(QAbstractTransition *transition)
{
return Transition(reinterpret_cast<quintptr>(transition));
}
StateMachineWatcher::StateMachineWatcher(QObject *parent)
: QObject(parent)
, m_watchedStateMachine(nullptr)
, m_lastEnteredState(nullptr)
, m_lastExitedState(nullptr)
{
}
StateMachineWatcher::~StateMachineWatcher() = default;
void StateMachineWatcher::setWatchedStateMachine(QStateMachine *machine)
{
if (m_watchedStateMachine == machine)
return;
m_watchedStateMachine = machine;
clearWatchedStates();
Q_FOREACH (QAbstractState *state, machine->findChildren<QAbstractState *>()) {
watchState(state);
}
emit watchedStateMachineChanged(machine);
}
QStateMachine *StateMachineWatcher::watchedStateMachine() const
{
return m_watchedStateMachine;
}
void StateMachineWatcher::watchState(QAbstractState *state)
{
if (state->machine() != m_watchedStateMachine)
return;
connect(state, &QAbstractState::entered,
this, &StateMachineWatcher::handleStateEntered, Qt::UniqueConnection);
connect(state, &QAbstractState::exited,
this, &StateMachineWatcher::handleStateExited, Qt::UniqueConnection);
connect(state, &QObject::destroyed,
this, &StateMachineWatcher::handleStateDestroyed, Qt::UniqueConnection);
Q_FOREACH (QAbstractTransition *transition, state->findChildren<QAbstractTransition *>()) {
connect(transition, &QAbstractTransition::triggered,
this, &StateMachineWatcher::handleTransitionTriggered, Qt::UniqueConnection);
}
m_watchedStates << state;
}
void StateMachineWatcher::clearWatchedStates()
{
for (QAbstractState *state : std::as_const(m_watchedStates)) {
disconnect(state, &QAbstractState::entered, this, &StateMachineWatcher::handleStateEntered);
disconnect(state, &QAbstractState::exited, this, &StateMachineWatcher::handleStateExited);
disconnect(state, &QObject::destroyed, this, &StateMachineWatcher::handleStateDestroyed);
Q_FOREACH (QAbstractTransition *transition, state->findChildren<QAbstractTransition *>()) {
disconnect(transition, &QAbstractTransition::triggered, this, &StateMachineWatcher::handleTransitionTriggered);
}
}
m_watchedStates.clear();
}
void StateMachineWatcher::handleTransitionTriggered()
{
QAbstractTransition *transition = qobject_cast<QAbstractTransition *>(QObject::sender());
Q_ASSERT(transition);
emit transitionTriggered(toTransition(transition));
}
void StateMachineWatcher::handleStateEntered()
{
QAbstractState *state = qobject_cast<QAbstractState *>(QObject::sender());
Q_ASSERT(state);
if (state->machine() != m_watchedStateMachine)
return;
if (state == m_lastEnteredState)
return;
m_lastEnteredState = state;
emit stateEntered(toState(state));
}
void StateMachineWatcher::handleStateExited()
{
QAbstractState *state = qobject_cast<QAbstractState *>(QObject::sender());
Q_ASSERT(state);
if (state->machine() != m_watchedStateMachine)
return;
if (state == m_lastExitedState)
return;
m_lastExitedState = state;
emit stateExited(toState(state));
}
void StateMachineWatcher::handleStateDestroyed()
{
QAbstractState *state = static_cast<QAbstractState *>(QObject::sender());
Q_ASSERT(state);
const int index = m_watchedStates.indexOf(state);
Q_ASSERT(index != -1);
m_watchedStates.remove(index);
}
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