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// SPDX-License-Identifier: GPL-2.0-only OR GPL-3.0-only OR LicenseRef-KDE-Accepted-GPL
// SPDX-FileCopyrightText: 2024 Harald Sitter <sitter@kde.org>
#include "LazyIconResolver.h"
#include <QCoreApplication>
#include <QEvent>
namespace
{
constexpr auto LoopEvent = QEvent::User;
} // namespace
LazyIconResolver *LazyIconResolver::instance()
{
static LazyIconResolver resolver;
return &resolver;
}
void LazyIconResolver::queue(AbstractResource *resource)
{
if (m_resources.isEmpty()) {
QCoreApplication::postEvent(this, new QEvent(LoopEvent), Qt::LowEventPriority);
}
m_resources.append(QPointer{resource});
}
void LazyIconResolver::resolve()
{
if (m_resources.empty()) {
return;
}
// We take the last so the most recent request gets resolved first.
auto resource = m_resources.takeLast();
if (!resource) {
return;
}
if (resource->hasResolvedIcon()) {
return;
}
resource->resolveIcon();
}
void LazyIconResolver::customEvent(QEvent *event)
{
if (event->type() == LoopEvent) {
resolve();
// Schedule a new loop run unconditionally of whether we resolved anything. So long as the queue is not empty.
if (!m_resources.isEmpty()) {
QCoreApplication::postEvent(this, new QEvent(LoopEvent), Qt::LowEventPriority);
}
}
QObject::customEvent(event);
}
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