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// Copyright 2017 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 "components/exo/data_device.h"
#include "base/logging.h"
#include "components/exo/data_device_delegate.h"
#include "components/exo/data_offer.h"
#include "components/exo/seat.h"
#include "components/exo/surface.h"
#include "ui/base/clipboard/clipboard.h"
#include "ui/base/clipboard/clipboard_monitor.h"
#include "ui/base/dragdrop/drag_drop_types.h"
#include "ui/base/dragdrop/drop_target_event.h"
namespace exo {
class ScopedDataOffer {
public:
ScopedDataOffer(DataOffer* data_offer, DataOfferObserver* observer)
: data_offer_(data_offer), observer_(observer) {
data_offer_->AddObserver(observer_);
}
~ScopedDataOffer() { data_offer_->RemoveObserver(observer_); }
DataOffer* get() { return data_offer_; }
private:
DataOffer* const data_offer_;
DataOfferObserver* const observer_;
DISALLOW_COPY_AND_ASSIGN(ScopedDataOffer);
};
class ScopedSurface {
public:
ScopedSurface(Surface* surface, SurfaceObserver* observer)
: surface_(surface), observer_(observer) {
surface_->AddSurfaceObserver(observer_);
}
~ScopedSurface() { surface_->RemoveSurfaceObserver(observer_); }
Surface* get() { return surface_; }
private:
Surface* const surface_;
SurfaceObserver* const observer_;
DISALLOW_COPY_AND_ASSIGN(ScopedSurface);
};
DataDevice::DataDevice(DataDeviceDelegate* delegate,
Seat* seat,
FileHelper* file_helper)
: delegate_(delegate), seat_(seat), file_helper_(file_helper) {
WMHelper::GetInstance()->AddDragDropObserver(this);
ui::ClipboardMonitor::GetInstance()->AddObserver(this);
seat_->AddObserver(this);
OnSurfaceFocusing(seat_->GetFocusedSurface());
}
DataDevice::~DataDevice() {
delegate_->OnDataDeviceDestroying(this);
WMHelper::GetInstance()->RemoveDragDropObserver(this);
ui::ClipboardMonitor::GetInstance()->RemoveObserver(this);
seat_->RemoveObserver(this);
}
void DataDevice::StartDrag(const DataSource* source_resource,
Surface* origin_resource,
Surface* icon_resource,
uint32_t serial) {
// TODO(hirono): Check if serial is valid. crbug.com/746111
NOTIMPLEMENTED();
}
void DataDevice::SetSelection(DataSource* source, uint32_t serial) {
// TODO(hirono): Check if serial is valid. crbug.com/746111
seat_->SetSelection(source);
}
void DataDevice::OnDragEntered(const ui::DropTargetEvent& event) {
DCHECK(!data_offer_);
Surface* surface = GetEffectiveTargetForEvent(event);
if (!surface)
return;
base::flat_set<DndAction> dnd_actions;
if (event.source_operations() & ui::DragDropTypes::DRAG_MOVE) {
dnd_actions.insert(DndAction::kMove);
}
if (event.source_operations() & ui::DragDropTypes::DRAG_COPY) {
dnd_actions.insert(DndAction::kCopy);
}
if (event.source_operations() & ui::DragDropTypes::DRAG_LINK) {
dnd_actions.insert(DndAction::kAsk);
}
data_offer_ = std::make_unique<ScopedDataOffer>(
delegate_->OnDataOffer(DataOffer::DRAG_DROP), this);
data_offer_->get()->SetDropData(file_helper_, event.data());
data_offer_->get()->SetSourceActions(dnd_actions);
data_offer_->get()->SetActions(base::flat_set<DndAction>(), DndAction::kAsk);
delegate_->OnEnter(surface, event.location_f(), *data_offer_->get());
}
int DataDevice::OnDragUpdated(const ui::DropTargetEvent& event) {
if (!data_offer_)
return ui::DragDropTypes::DRAG_NONE;
delegate_->OnMotion(event.time_stamp(), event.location_f());
// TODO(hirono): dnd_action() here may not be updated. Chrome needs to provide
// a way to update DND action asynchronously.
switch (data_offer_->get()->dnd_action()) {
case DndAction::kMove:
return ui::DragDropTypes::DRAG_MOVE;
case DndAction::kCopy:
return ui::DragDropTypes::DRAG_COPY;
case DndAction::kAsk:
return ui::DragDropTypes::DRAG_LINK;
case DndAction::kNone:
return ui::DragDropTypes::DRAG_NONE;
}
}
void DataDevice::OnDragExited() {
if (!data_offer_)
return;
delegate_->OnLeave();
data_offer_.reset();
}
int DataDevice::OnPerformDrop(const ui::DropTargetEvent& event) {
if (!data_offer_)
return ui::DragDropTypes::DRAG_NONE;
delegate_->OnDrop();
data_offer_.reset();
return ui::DragDropTypes::DRAG_NONE;
}
void DataDevice::OnClipboardDataChanged() {
if (!focused_surface_)
return;
SetSelectionToCurrentClipboardData();
}
void DataDevice::OnSurfaceFocusing(Surface* surface) {
Surface* next_focused_surface =
surface && delegate_->CanAcceptDataEventsForSurface(surface) ? surface
: nullptr;
// Check if focused surface is not changed.
if (focused_surface_ && focused_surface_->get() == next_focused_surface)
return;
std::unique_ptr<ScopedSurface> last_focused_surface =
std::move(focused_surface_);
focused_surface_ = next_focused_surface ? std::make_unique<ScopedSurface>(
next_focused_surface, this)
: nullptr;
// Check if the client newly obtained focus.
if (focused_surface_ && !last_focused_surface)
SetSelectionToCurrentClipboardData();
}
void DataDevice::OnSurfaceFocused(Surface* surface) {}
void DataDevice::OnDataOfferDestroying(DataOffer* data_offer) {
if (data_offer_ && data_offer_->get() == data_offer)
data_offer_.reset();
}
void DataDevice::OnSurfaceDestroying(Surface* surface) {
if (focused_surface_ && focused_surface_->get() == surface)
focused_surface_.reset();
}
Surface* DataDevice::GetEffectiveTargetForEvent(
const ui::DropTargetEvent& event) const {
aura::Window* window = static_cast<aura::Window*>(event.target());
if (!window)
return nullptr;
Surface* target = Surface::AsSurface(window);
if (!target)
return nullptr;
return delegate_->CanAcceptDataEventsForSurface(target) ? target : nullptr;
}
void DataDevice::SetSelectionToCurrentClipboardData() {
DataOffer* data_offer = delegate_->OnDataOffer(DataOffer::COPY_PASTE);
data_offer->SetClipboardData(file_helper_,
*ui::Clipboard::GetForCurrentThread());
delegate_->OnSelection(*data_offer);
}
} // namespace exo
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