From 6bf0a5cb5034a7e684dcc3500e841785237ce2dd Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Sun, 7 Apr 2024 19:32:43 +0200 Subject: Adding upstream version 1:115.7.0. Signed-off-by: Daniel Baumann --- ipc/chromium/src/base/message_pump_qt.cc | 177 +++++++++++++++++++++++++++++++ 1 file changed, 177 insertions(+) create mode 100644 ipc/chromium/src/base/message_pump_qt.cc (limited to 'ipc/chromium/src/base/message_pump_qt.cc') diff --git a/ipc/chromium/src/base/message_pump_qt.cc b/ipc/chromium/src/base/message_pump_qt.cc new file mode 100644 index 0000000000..d96e2c5e62 --- /dev/null +++ b/ipc/chromium/src/base/message_pump_qt.cc @@ -0,0 +1,177 @@ +/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ +/* vim: set ts=8 sts=2 et sw=2 tw=80: */ +// Copyright (c) 2010 The Chromium Authors. All rights reserved. +// Use of this source code is governed by a BSD-style license that can be +// found in the LICENSE file. + +#include +#include +#include +#include +#include + +#include "base/message_pump_qt.h" + +#include +#include +#include + +#include "base/eintr_wrapper.h" +#include "base/logging.h" +#include "base/platform_thread.h" + +namespace { +// Cached QEvent user type, registered for our event system +static int sPokeEvent; +} // namespace + +namespace base { + +MessagePumpForUI::MessagePumpForUI() : state_(NULL), qt_pump(*this) {} + +MessagePumpForUI::~MessagePumpForUI() {} + +MessagePumpQt::MessagePumpQt(MessagePumpForUI& aPump) + : pump(aPump), mTimer(new QTimer(this)) { + // Register our custom event type, to use in qApp event loop + sPokeEvent = QEvent::registerEventType(); + connect(mTimer, SIGNAL(timeout()), this, SLOT(dispatchDelayed())); + mTimer->setSingleShot(true); +} + +MessagePumpQt::~MessagePumpQt() { + mTimer->stop(); + delete mTimer; +} + +bool MessagePumpQt::event(QEvent* e) { + if (e->type() == sPokeEvent) { + pump.HandleDispatch(); + return true; + } + return false; +} + +void MessagePumpQt::scheduleDelayedIfNeeded( + const TimeTicks& delayed_work_time) { + if (delayed_work_time.is_null()) { + return; + } + + if (mTimer->isActive()) { + mTimer->stop(); + } + + TimeDelta later = delayed_work_time - TimeTicks::Now(); + // later.InMilliseconds() returns an int64_t, QTimer only accepts int's for + // start(), std::min only works on exact same types. + int laterMsecs = later.InMilliseconds() > std::numeric_limits::max() + ? std::numeric_limits::max() + : later.InMilliseconds(); + mTimer->start(laterMsecs > 0 ? laterMsecs : 0); +} + +void MessagePumpQt::dispatchDelayed() { pump.HandleDispatch(); } + +void MessagePumpForUI::Run(Delegate* delegate) { + RunState state; + state.delegate = delegate; + state.should_quit = false; + state.run_depth = state_ ? state_->run_depth + 1 : 1; + // We really only do a single task for each iteration of the loop. If we + // have done something, assume there is likely something more to do. This + // will mean that we don't block on the message pump until there was nothing + // more to do. We also set this to true to make sure not to block on the + // first iteration of the loop, so RunAllPending() works correctly. + bool more_work_is_plausible = true; + + RunState* previous_state = state_; + state_ = &state; + + for (;;) { + QEventLoop::ProcessEventsFlags block = QEventLoop::AllEvents; + if (!more_work_is_plausible) { + block |= QEventLoop::WaitForMoreEvents; + } + + QAbstractEventDispatcher* dispatcher = + QAbstractEventDispatcher::instance(QThread::currentThread()); + // An assertion seems too much here, as during startup, + // the dispatcher might not be ready yet. + if (!dispatcher) { + return; + } + + // processEvent's returns true if an event has been processed. + more_work_is_plausible = dispatcher->processEvents(block); + + if (state_->should_quit) { + break; + } + + more_work_is_plausible |= state_->delegate->DoWork(); + if (state_->should_quit) { + break; + } + + more_work_is_plausible |= + state_->delegate->DoDelayedWork(&delayed_work_time_); + if (state_->should_quit) { + break; + } + + qt_pump.scheduleDelayedIfNeeded(delayed_work_time_); + + if (more_work_is_plausible) { + continue; + } + + more_work_is_plausible = state_->delegate->DoIdleWork(); + if (state_->should_quit) { + break; + } + } + + state_ = previous_state; +} + +void MessagePumpForUI::HandleDispatch() { + if (state_->should_quit) { + return; + } + + if (state_->delegate->DoWork()) { + // there might be more, see more_work_is_plausible + // variable above, that's why we ScheduleWork() to keep going. + ScheduleWork(); + } + + if (state_->should_quit) { + return; + } + + state_->delegate->DoDelayedWork(&delayed_work_time_); + qt_pump.scheduleDelayedIfNeeded(delayed_work_time_); +} + +void MessagePumpForUI::Quit() { + if (state_) { + state_->should_quit = true; + } else { + NOTREACHED() << "Quit called outside Run!"; + } +} + +void MessagePumpForUI::ScheduleWork() { + QCoreApplication::postEvent(&qt_pump, new QEvent((QEvent::Type)sPokeEvent)); +} + +void MessagePumpForUI::ScheduleDelayedWork(const TimeTicks& delayed_work_time) { + // On GLib implementation, a work source is defined which explicitly checks + // the time that has passed. Here, on Qt we can use a QTimer that enqueues our + // event signal in an event queue. + delayed_work_time_ = delayed_work_time; + qt_pump.scheduleDelayedIfNeeded(delayed_work_time_); +} + +} // namespace base -- cgit v1.2.3