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// Copyright 2018 The Chromium Authors
// 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/files/scoped_file.h"
#include "base/functional/bind.h"
#include "base/logging.h"
#include "ui/events/base_event_utils.h"
#include "ui/gfx/geometry/point_f.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_drag_controller.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_exchange_data_provider.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 constexpr wl_data_device_listener kDataDeviceListener = {
.data_offer = &OnDataOffer,
.enter = &OnEnter,
.leave = &OnLeave,
.motion = &OnMotion,
.drop = &OnDrop,
.selection = &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,
uint32_t serial,
wl_surface* icon_surface,
DragDelegate* delegate) {
DCHECK(delegate);
CHECK(!drag_delegate_);
drag_delegate_ = delegate;
wl_data_device_start_drag(data_device_.get(), data_source.data_source(),
origin_window.root_surface()->surface(),
icon_surface, serial);
drag_delegate_->DrawIcon();
connection()->Flush();
}
void WaylandDataDevice::ResetDragDelegate() {
drag_delegate_ = nullptr;
}
void WaylandDataDevice::ResetDragDelegateIfNotDragSource() {
// When in an active drag-and-drop session initiated by an external Wayland
// client, |drag_delegate_| is set at OnEnter, and must be reset upon
// OnLeave/OnDrop in order to avoid potential memory corruption issues.
if (drag_delegate_ && !drag_delegate_->IsDragSource()) {
ResetDragDelegate();
}
}
void WaylandDataDevice::SetSelectionSource(WaylandDataSource* source,
uint32_t serial) {
auto* data_source = source ? source->data_source() : nullptr;
wl_data_device_set_selection(data_device_.get(), data_source, serial);
connection()->Flush();
}
bool WaylandDataDevice::IsDragInProgress() const {
// Starting wayland drag sessions require clients to provide a drag delegate.
// The delegate is explicitly reset by the client when the wayland drag
// session has ended.
return !!drag_delegate_;
}
// static
void WaylandDataDevice::OnDataOffer(void* data,
wl_data_device* data_device,
wl_data_offer* offer) {
auto* self = static_cast<WaylandDataDevice*>(data);
DCHECK(self);
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) {
auto* self = static_cast<WaylandDataDevice*>(data);
WaylandWindow* window = wl::RootWindowFromWlSurface(surface);
// During Chrome's tab dragging, when a browser window is quickly snapped in
// and out, it might get destroyed before the wl_data_device::enter event is
// processed for a drag offer. If this happens, |window| will be null here, so
// destroy |new_offer_| here, as some compositors assume it. Such behavior has
// been observed in Exosphere compositor, for example.
if (!window) {
self->new_offer_.reset();
VLOG(1) << "Failed to get window.";
return;
}
// drag enter event doesn't have timestamp. Use EventTimeForNow().
const auto timestamp = EventTimeForNow();
// 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_));
self->drag_delegate_->OnDragEnter(
window, gfx::PointF(wl_fixed_to_double(x), wl_fixed_to_double(y)),
timestamp, serial);
self->connection()->Flush();
}
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_) {
self->drag_delegate_->OnDragMotion(
gfx::PointF(wl_fixed_to_double(x), wl_fixed_to_double(y)),
wl::EventMillisecondsToTimeTicks(time));
}
}
void WaylandDataDevice::OnDrop(void* data, wl_data_device* data_device) {
// drop event doesn't have timestamp. Use EventTimeForNow().
const auto timestamp = EventTimeForNow();
auto* self = static_cast<WaylandDataDevice*>(data);
if (self->drag_delegate_) {
self->drag_delegate_->OnDragDrop(timestamp);
self->connection()->Flush();
}
}
void WaylandDataDevice::OnLeave(void* data, wl_data_device* data_device) {
// leave event doesn't have timestamp. Use EventTimeForNow().
const auto timestamp = EventTimeForNow();
auto* self = static_cast<WaylandDataDevice*>(data);
if (self->drag_delegate_) {
self->drag_delegate_->OnDragLeave(timestamp);
self->connection()->Flush();
}
self->ResetDragDelegateIfNotDragSource();
}
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 selection data available to fetch.
if (!offer) {
self->ResetDataOffer();
} else {
DCHECK(self->new_offer_);
self->set_data_offer(std::move(self->new_offer_));
self->data_offer()->EnsureTextMimeTypeIfNeeded();
}
self->NotifySelectionOffer(self->data_offer());
}
} // namespace ui
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