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// Copyright 2018 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "ui/ozone/platform/wayland/host/wayland_data_device.h"
#include <memory>
#include <string>
#include <utility>
#include "base/bind.h"
#include "base/files/scoped_file.h"
#include "ui/base/clipboard/clipboard_buffer.h"
#include "ui/gfx/geometry/point_f.h"
#include "ui/ozone/platform/wayland/common/data_util.h"
#include "ui/ozone/platform/wayland/common/wayland_object.h"
#include "ui/ozone/platform/wayland/common/wayland_util.h"
#include "ui/ozone/platform/wayland/host/wayland_connection.h"
#include "ui/ozone/platform/wayland/host/wayland_data_offer.h"
#include "ui/ozone/platform/wayland/host/wayland_data_source.h"
#include "ui/ozone/platform/wayland/host/wayland_window.h"
namespace ui {
WaylandDataDevice::WaylandDataDevice(WaylandConnection* connection,
wl_data_device* data_device)
: WaylandDataDeviceBase(connection), data_device_(data_device) {
static const struct wl_data_device_listener kDataDeviceListener = {
WaylandDataDevice::OnOffer, WaylandDataDevice::OnEnter,
WaylandDataDevice::OnLeave, WaylandDataDevice::OnMotion,
WaylandDataDevice::OnDrop, WaylandDataDevice::OnSelection};
wl_data_device_add_listener(data_device_.get(), &kDataDeviceListener, this);
}
WaylandDataDevice::~WaylandDataDevice() = default;
void WaylandDataDevice::StartDrag(const WaylandDataSource& data_source,
const WaylandWindow& origin_window,
wl_surface* icon_surface,
DragDelegate* delegate) {
DCHECK(delegate);
DCHECK(!drag_delegate_);
drag_delegate_ = delegate;
wl_data_device_start_drag(data_device_.get(), data_source.data_source(),
origin_window.root_surface()->surface(),
icon_surface, connection()->serial());
drag_delegate_->DrawIcon();
connection()->ScheduleFlush();
}
void WaylandDataDevice::ResetDragDelegate() {
DCHECK(drag_delegate_);
drag_delegate_ = nullptr;
}
void WaylandDataDevice::RequestData(WaylandDataOffer* offer,
const std::string& mime_type,
RequestDataCallback callback) {
DCHECK(offer);
DCHECK(wl::IsMimeTypeSupported(mime_type));
base::ScopedFD fd = offer->Receive(mime_type);
if (!fd.is_valid()) {
LOG(ERROR) << "Failed to open file descriptor.";
return;
}
// Ensure there is not pending operation to be performed by the compositor,
// otherwise read(..) can block awaiting data to be sent to pipe.
RegisterDeferredReadClosure(base::BindOnce(
&WaylandDataDevice::ReadDragDataFromFD, base::Unretained(this),
std::move(fd), std::move(callback)));
RegisterDeferredReadCallback();
}
void WaylandDataDevice::SetSelectionSource(WaylandDataSource* source) {
DCHECK(source);
wl_data_device_set_selection(data_device_.get(), source->data_source(),
connection()->serial());
connection()->ScheduleFlush();
}
void WaylandDataDevice::ReadDragDataFromFD(base::ScopedFD fd,
RequestDataCallback callback) {
std::vector<uint8_t> contents;
wl::ReadDataFromFD(std::move(fd), &contents);
std::move(callback).Run(scoped_refptr<base::RefCountedBytes>(
base::RefCountedBytes::TakeVector(&contents)));
}
// static
void WaylandDataDevice::OnOffer(void* data,
wl_data_device* data_device,
wl_data_offer* offer) {
auto* self = static_cast<WaylandDataDevice*>(data);
self->connection()->clipboard()->UpdateSequenceNumber(
ClipboardBuffer::kCopyPaste);
DCHECK(!self->new_offer_);
self->new_offer_ = std::make_unique<WaylandDataOffer>(offer);
}
void WaylandDataDevice::OnEnter(void* data,
wl_data_device* data_device,
uint32_t serial,
wl_surface* surface,
wl_fixed_t x,
wl_fixed_t y,
wl_data_offer* offer) {
WaylandWindow* window = wl::RootWindowFromWlSurface(surface);
if (!window) {
LOG(ERROR) << "Failed to get window.";
return;
}
auto* self = static_cast<WaylandDataDevice*>(data);
// Null |drag_delegate_| here means that the DND session has been initiated by
// an external application. In this case, use the default data drag delegate.
if (!self->drag_delegate_)
self->drag_delegate_ = self->connection()->data_drag_controller();
DCHECK(self->new_offer_);
self->drag_delegate_->OnDragOffer(std::move(self->new_offer_));
gfx::PointF point(wl_fixed_to_double(x), wl_fixed_to_double(y));
self->drag_delegate_->OnDragEnter(window, point, serial);
}
void WaylandDataDevice::OnMotion(void* data,
wl_data_device* data_device,
uint32_t time,
wl_fixed_t x,
wl_fixed_t y) {
auto* self = static_cast<WaylandDataDevice*>(data);
if (self->drag_delegate_) {
gfx::PointF point(wl_fixed_to_double(x), wl_fixed_to_double(y));
self->drag_delegate_->OnDragMotion(point);
}
}
void WaylandDataDevice::OnDrop(void* data, wl_data_device* data_device) {
auto* self = static_cast<WaylandDataDevice*>(data);
if (self->drag_delegate_)
self->drag_delegate_->OnDragDrop();
}
void WaylandDataDevice::OnLeave(void* data, wl_data_device* data_device) {
auto* self = static_cast<WaylandDataDevice*>(data);
if (self->drag_delegate_)
self->drag_delegate_->OnDragLeave();
// When in a DND session initiated by an external application,
// |drag_delegate_| is set at OnEnter, and must be reset here to avoid
// potential use-after-free. Above call to OnDragLeave() may result in
// |drag_delegate_| being reset, so it must be checked here as well.
if (self->drag_delegate_ && !self->drag_delegate_->IsDragSource())
self->drag_delegate_ = nullptr;
}
void WaylandDataDevice::OnSelection(void* data,
wl_data_device* data_device,
wl_data_offer* offer) {
auto* self = static_cast<WaylandDataDevice*>(data);
DCHECK(self);
// 'offer' will be null to indicate that the selection is no longer valid,
// i.e. there is no longer clipboard data available to paste.
if (!offer) {
self->ResetDataOffer();
// Clear Clipboard cache.
self->connection()->clipboard()->SetData({}, {});
return;
}
DCHECK(self->new_offer_);
self->set_data_offer(std::move(self->new_offer_));
self->data_offer()->EnsureTextMimeTypeIfNeeded();
}
} // namespace ui
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