ladybird/Ladybird/EventLoopPluginQt.cpp
Andreas Kling ef553a4b76 Ladybird: Don't burn 100% CPU in EventLoopPluginQt::spin_until()
There's no point in busy-waiting for the condition to come true.
By passing the `WaitForMoreEvents` flag to `processEvents()`, we allow
Qt to block until it has something for us to react to.

This was extremely noticeable when waiting for large resources to
finish loading.
2022-12-25 07:58:58 -07:00

46 lines
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/*
* Copyright (c) 2022, Andreas Kling <kling@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#define AK_DONT_REPLACE_STD
#include "EventLoopPluginQt.h"
#include "TimerQt.h"
#include <AK/Function.h>
#include <AK/NonnullRefPtr.h>
#include <QCoreApplication>
#include <QTimer>
namespace Ladybird {
EventLoopPluginQt::EventLoopPluginQt() = default;
EventLoopPluginQt::~EventLoopPluginQt() = default;
void EventLoopPluginQt::spin_until(Function<bool()> goal_condition)
{
while (!goal_condition())
QCoreApplication::processEvents(QEventLoop::ProcessEventsFlag::AllEvents | QEventLoop::ProcessEventsFlag::WaitForMoreEvents);
}
void EventLoopPluginQt::deferred_invoke(Function<void()> function)
{
VERIFY(function);
QTimer::singleShot(0, [function = move(function)] {
function();
});
}
NonnullRefPtr<Web::Platform::Timer> EventLoopPluginQt::create_timer()
{
return TimerQt::create();
}
void EventLoopPluginQt::quit()
{
QCoreApplication::quit();
}
}