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// Copyright (C) 2022 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
#include "qbluetoothdevicewatcher_winrt_p.h"
#include <winrt/Windows.Foundation.Collections.h>
using namespace winrt::Windows::Foundation;
using namespace winrt::Windows::Devices::Enumeration;
QT_BEGIN_NAMESPACE
QBluetoothDeviceWatcherWinRT::QBluetoothDeviceWatcherWinRT(int id, winrt::hstring selector)
: m_id(id),
m_watcher(DeviceInformation::CreateWatcher(selector))
{
qRegisterMetaType<winrt::hstring>("winrt::hstring");
}
QBluetoothDeviceWatcherWinRT::QBluetoothDeviceWatcherWinRT(int id, winrt::hstring selector,
winrt::Windows::Devices::Enumeration::DeviceInformationKind kind)
: m_id(id)
{
qRegisterMetaType<winrt::hstring>("winrt::hstring");
const winrt::param::iterable<winrt::hstring> extra {};
m_watcher = DeviceInformation::CreateWatcher(selector, extra, kind);
}
QBluetoothDeviceWatcherWinRT::~QBluetoothDeviceWatcherWinRT()
{
stop();
}
bool QBluetoothDeviceWatcherWinRT::init()
{
if (!m_watcher) {
qWarning("Windows failed to create an instance of DeviceWatcher. "
"Detection of Bluetooth devices might not work correctly.");
return false;
}
return true;
}
void QBluetoothDeviceWatcherWinRT::start()
{
if (m_watcher) {
subscribeToEvents();
m_watcher.Start();
}
}
void QBluetoothDeviceWatcherWinRT::stop()
{
if (m_watcher && canStop()) {
unsubscribeFromEvents();
m_watcher.Stop();
}
}
void QBluetoothDeviceWatcherWinRT::subscribeToEvents()
{
Q_ASSERT(m_watcher.Status() == DeviceWatcherStatus::Created);
// The callbacks are triggered from separate threads. So we capture
// thisPtr to make sure that the object is valid.
auto thisPtr = shared_from_this();
m_addedToken = m_watcher.Added([thisPtr](DeviceWatcher, const DeviceInformation &info) {
emit thisPtr->deviceAdded(info.Id(), thisPtr->m_id);
});
m_removedToken =
m_watcher.Removed([thisPtr](DeviceWatcher, const DeviceInformationUpdate &upd) {
emit thisPtr->deviceRemoved(upd.Id(), thisPtr->m_id);
});
m_updatedToken =
m_watcher.Updated([thisPtr](DeviceWatcher, const DeviceInformationUpdate &upd) {
emit thisPtr->deviceUpdated(upd.Id(), thisPtr->m_id);
});
// because of ambiguous declaration
using WinRtInspectable = winrt::Windows::Foundation::IInspectable;
m_enumerationToken =
m_watcher.EnumerationCompleted([thisPtr](DeviceWatcher, const WinRtInspectable &) {
emit thisPtr->enumerationCompleted(thisPtr->m_id);
});
m_stoppedToken = m_watcher.Stopped([thisPtr](DeviceWatcher, const WinRtInspectable &) {
emit thisPtr->watcherStopped(thisPtr->m_id);
});
}
void QBluetoothDeviceWatcherWinRT::unsubscribeFromEvents()
{
m_watcher.Added(m_addedToken);
m_watcher.Removed(m_removedToken);
m_watcher.Updated(m_updatedToken);
m_watcher.EnumerationCompleted(m_enumerationToken);
m_watcher.Stopped(m_stoppedToken);
}
bool QBluetoothDeviceWatcherWinRT::canStop() const
{
const auto status = m_watcher.Status();
// Also 'Aborted', but calling Stop() there is a no-op
return status == DeviceWatcherStatus::Started
|| status == DeviceWatcherStatus::EnumerationCompleted;
}
QT_END_NAMESPACE
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