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// Copyright 2017 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef COMPONENTS_EXO_DATA_DEVICE_DELEGATE_H_
#define COMPONENTS_EXO_DATA_DEVICE_DELEGATE_H_
#include "components/exo/data_offer.h"
namespace base {
class TimeTicks;
}
namespace gfx {
class PointF;
}
namespace exo {
class DataDevice;
class Surface;
enum class DndAction;
// Handles events on data devices in context-specific ways.
class DataDeviceDelegate {
public:
// Called at the top of the data device's destructor, to give observers a
// chance to remove themselves.
virtual void OnDataDeviceDestroying(DataDevice* data_device) = 0;
// Called when DataOffer object is delivered from a client. DataDeviceDelegate
// has responsibility to release the returned DataOffer object.
virtual DataOffer* OnDataOffer() = 0;
// Called during a drag operation when pointer enters |surface|.
virtual void OnEnter(Surface* surface,
const gfx::PointF& location,
const DataOffer& data_offer) = 0;
// Called during a drag operation when pointer leaves |surface|.
virtual void OnLeave() = 0;
// Called during a drag operation when pointer moves on the |surface|.
virtual void OnMotion(base::TimeTicks time_stamp,
const gfx::PointF& location) = 0;
// Called during a drag operation when user drops dragging data on the
// |surface|.
virtual void OnDrop() = 0;
// Called when the data is pasted on the DataDevice.
virtual void OnSelection(const DataOffer& data_offer) = 0;
// This should return true if |surface| is a valid target for this data
// device. E.g. the surface is owned by the same client as the data device.
virtual bool CanAcceptDataEventsForSurface(Surface* surface) const = 0;
protected:
virtual ~DataDeviceDelegate() {}
};
} // namespace exo
#endif // COMPONENTS_EXO_DATA_DEVICE_DELEGATE_H_
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