| // 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. |
| |
| #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_ |