62 lines
1.2 KiB
C++
62 lines
1.2 KiB
C++
// This file is part of Desktop App Toolkit,
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// a set of libraries for developing nice desktop applications.
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//
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// For license and copyright information please follow this link:
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// https://github.com/desktop-app/legal/blob/master/LEGAL
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//
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#pragma once
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#include <QtCore/QEvent>
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#include <QtCore/QCoreApplication>
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#include "base/basic_types.h"
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namespace base {
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class InvokeQueuedEvent : public QEvent {
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public:
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static constexpr auto kType = QEvent::Type(60666);
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explicit InvokeQueuedEvent(FnMut<void()> &&method)
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: QEvent(kType)
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, _method(std::move(method)) {
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}
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void invoke() {
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_method();
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}
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private:
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FnMut<void()> _method;
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};
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} // namespace base
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template <typename Lambda>
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inline void InvokeQueued(const QObject *context, Lambda &&lambda) {
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QCoreApplication::postEvent(
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const_cast<QObject*>(context),
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new base::InvokeQueuedEvent(std::forward<Lambda>(lambda)));
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}
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class SingleQueuedInvokation : public QObject {
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public:
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SingleQueuedInvokation(Fn<void()> callback) : _callback(callback) {
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}
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void call() {
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if (_pending.testAndSetAcquire(0, 1)) {
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InvokeQueued(this, [this] {
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if (_pending.testAndSetRelease(1, 0)) {
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_callback();
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}
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});
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}
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}
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private:
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Fn<void()> _callback;
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QAtomicInt _pending = { 0 };
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};
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