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// Copyright (C) 2017 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only
#include "qwldatadevicemanager_p.h"
#include <QtWaylandCompositor/QWaylandCompositor>
#include <QtWaylandCompositor/private/qwaylandcompositor_p.h>
#include <QtWaylandCompositor/private/qwaylandseat_p.h>
#include "qwldatadevice_p.h"
#include "qwldatasource_p.h"
#include "qwldataoffer_p.h"
#include "qwaylandmimehelper_p.h"
#include <QtCore/QDebug>
#include <QtCore/QSocketNotifier>
#include <fcntl.h>
#include <QtCore/private/qcore_unix_p.h>
#include <QtCore/QFile>
QT_BEGIN_NAMESPACE
namespace QtWayland {
DataDeviceManager::DataDeviceManager(QWaylandCompositor *compositor)
: wl_data_device_manager(compositor->display(), 1)
, m_compositor(compositor)
{
}
void DataDeviceManager::setCurrentSelectionSource(DataSource *source)
{
if (m_current_selection_source && source
&& m_current_selection_source->time() > source->time()) {
qDebug() << "Trying to set older selection";
return;
}
m_compositorOwnsSelection = false;
finishReadFromClient();
m_current_selection_source = source;
if (source)
source->setManager(this);
// When retained selection is enabled, the compositor will query all the data from the client.
// This makes it possible to
// 1. supply the selection after the offering client is gone
// 2. make it possible for the compositor to participate in copy-paste
// The downside is decreased performance, therefore this mode has to be enabled
// explicitly in the compositors.
if (source && m_compositor->retainedSelectionEnabled()) {
m_retainedData.clear();
m_retainedReadIndex = 0;
retain();
}
}
void DataDeviceManager::sourceDestroyed(DataSource *source)
{
if (m_current_selection_source == source)
finishReadFromClient();
}
void DataDeviceManager::retain()
{
QList<QString> offers = m_current_selection_source->mimeTypes();
finishReadFromClient();
if (m_retainedReadIndex >= offers.size()) {
QWaylandCompositorPrivate::get(m_compositor)->feedRetainedSelectionData(&m_retainedData);
return;
}
QString mimeType = offers.at(m_retainedReadIndex);
m_retainedReadBuf.clear();
int fd[2];
if (pipe(fd) == -1) {
qWarning("Clipboard: Failed to create pipe");
return;
}
fcntl(fd[0], F_SETFL, fcntl(fd[0], F_GETFL, 0) | O_NONBLOCK);
m_current_selection_source->send(mimeType, fd[1]);
m_retainedReadNotifier = new QSocketNotifier(fd[0], QSocketNotifier::Read, this);
connect(m_retainedReadNotifier, &QSocketNotifier::activated, this, &DataDeviceManager::readFromClient);
}
void DataDeviceManager::finishReadFromClient(bool exhausted)
{
Q_UNUSED(exhausted);
if (m_retainedReadNotifier) {
if (exhausted) {
int fd = m_retainedReadNotifier->socket();
delete m_retainedReadNotifier;
close(fd);
} else {
// Do not close the handle or destroy the read notifier here
// or else clients may SIGPIPE.
m_obsoleteRetainedReadNotifiers.append(m_retainedReadNotifier);
}
m_retainedReadNotifier = nullptr;
}
}
void DataDeviceManager::readFromClient(int fd)
{
static char buf[4096];
int obsCount = m_obsoleteRetainedReadNotifiers.size();
for (int i = 0; i < obsCount; ++i) {
QSocketNotifier *sn = m_obsoleteRetainedReadNotifiers.at(i);
if (sn->socket() == fd) {
// Read and drop the data, stopping to read and closing the handle
// is not yet safe because that could kill the client with SIGPIPE
// when it still tries to write.
int n;
do {
n = QT_READ(fd, buf, sizeof buf);
} while (n > 0);
if (n != -1 || (errno != EAGAIN && errno != EWOULDBLOCK)) {
m_obsoleteRetainedReadNotifiers.removeAt(i);
delete sn;
close(fd);
}
return;
}
}
int n = QT_READ(fd, buf, sizeof buf);
if (n <= 0) {
if (n != -1 || (errno != EAGAIN && errno != EWOULDBLOCK)) {
finishReadFromClient(true);
QList<QString> offers = m_current_selection_source->mimeTypes();
QString mimeType = offers.at(m_retainedReadIndex);
m_retainedData.setData(mimeType, m_retainedReadBuf);
++m_retainedReadIndex;
retain();
}
} else {
m_retainedReadBuf.append(buf, n);
}
}
DataSource *DataDeviceManager::currentSelectionSource()
{
return m_current_selection_source;
}
struct wl_display *DataDeviceManager::display() const
{
return m_compositor->display();
}
void DataDeviceManager::overrideSelection(const QMimeData &mimeData)
{
const QStringList formats = mimeData.formats();
if (formats.isEmpty())
return;
m_retainedData.clear();
for (const QString &format : formats)
m_retainedData.setData(format, mimeData.data(format));
QWaylandCompositorPrivate::get(m_compositor)->feedRetainedSelectionData(&m_retainedData);
m_compositorOwnsSelection = true;
QWaylandSeat *dev = m_compositor->defaultSeat();
QWaylandSurface *focusSurface = dev->keyboardFocus();
if (focusSurface)
offerFromCompositorToClient(
QWaylandSeatPrivate::get(dev)->dataDevice()->resourceMap().value(focusSurface->waylandClient())->handle);
}
bool DataDeviceManager::offerFromCompositorToClient(wl_resource *clientDataDeviceResource)
{
if (!m_compositorOwnsSelection)
return false;
wl_client *client = wl_resource_get_client(clientDataDeviceResource);
//qDebug("compositor offers %d types to %p", m_retainedData.formats().count(), client);
struct wl_resource *selectionOffer =
wl_resource_create(client, &wl_data_offer_interface, -1, 0);
wl_resource_set_implementation(selectionOffer, &compositor_offer_interface, this, nullptr);
wl_data_device_send_data_offer(clientDataDeviceResource, selectionOffer);
const auto formats = m_retainedData.formats();
for (const QString &format : formats) {
QByteArray ba = format.toLatin1();
wl_data_offer_send_offer(selectionOffer, ba.constData());
}
wl_data_device_send_selection(clientDataDeviceResource, selectionOffer);
return true;
}
void DataDeviceManager::offerRetainedSelection(wl_resource *clientDataDeviceResource)
{
if (m_retainedData.formats().isEmpty())
return;
m_compositorOwnsSelection = true;
offerFromCompositorToClient(clientDataDeviceResource);
}
void DataDeviceManager::data_device_manager_create_data_source(Resource *resource, uint32_t id)
{
new DataSource(resource->client(), id, m_compositor->currentTimeMsecs());
}
void DataDeviceManager::data_device_manager_get_data_device(Resource *resource, uint32_t id, struct ::wl_resource *seat)
{
QWaylandSeat *input_device = QWaylandSeat::fromSeatResource(seat);
QWaylandSeatPrivate::get(input_device)->clientRequestedDataDevice(this, resource->client(), id);
}
void DataDeviceManager::comp_accept(wl_client *, wl_resource *, uint32_t, const char *)
{
}
void DataDeviceManager::comp_receive(wl_client *client, wl_resource *resource, const char *mime_type, int32_t fd)
{
Q_UNUSED(client);
DataDeviceManager *self = static_cast<DataDeviceManager *>(wl_resource_get_user_data(resource));
//qDebug("client %p wants data for type %s from compositor", client, mime_type);
QByteArray content = QWaylandMimeHelper::getByteArray(&self->m_retainedData, QString::fromLatin1(mime_type));
if (!content.isEmpty()) {
QFile f;
if (f.open(fd, QIODevice::WriteOnly))
f.write(content);
}
close(fd);
}
void DataDeviceManager::comp_destroy(wl_client *, wl_resource *)
{
}
QT_WARNING_DISABLE_GCC("-Wmissing-field-initializers")
QT_WARNING_DISABLE_CLANG("-Wmissing-field-initializers")
const struct wl_data_offer_interface DataDeviceManager::compositor_offer_interface = {
DataDeviceManager::comp_accept,
DataDeviceManager::comp_receive,
DataDeviceManager::comp_destroy
};
} //namespace
QT_END_NAMESPACE
#include "moc_qwldatadevicemanager_p.cpp"
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