| // Copyright 2015 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_POINTER_DELEGATE_H_ |
| #define COMPONENTS_EXO_POINTER_DELEGATE_H_ |
| |
| #include "base/time/time.h" |
| #include "ui/events/event_constants.h" |
| |
| namespace gfx { |
| class Point; |
| class Vector2d; |
| } |
| |
| namespace exo { |
| class Pointer; |
| class Surface; |
| |
| // Handles events on pointers in context-specific ways. |
| class PointerDelegate { |
| public: |
| // Called at the top of the pointer's destructor, to give observers a |
| // chance to remove themselves. |
| virtual void OnPointerDestroying(Pointer* pointer) = 0; |
| |
| // This should return true if |surface| is a valid target for this pointer. |
| // E.g. the surface is owned by the same client as the pointer. |
| virtual bool CanAcceptPointerEventsForSurface(Surface* surface) const = 0; |
| |
| // Called when pointer enters a new valid target surface. |location| |
| // is the location of pointer relative to the origin of surface and |
| // |button_flags| contains all currently pressed buttons. |
| virtual void OnPointerEnter(Surface* surface, |
| const gfx::Point& location, |
| int pressed_button_flags) = 0; |
| |
| // Called when pointer leaves a valid target surface. |
| virtual void OnPointerLeave(Surface* surface) = 0; |
| |
| // Called when pointer moved within the current target surface. |
| virtual void OnPointerMotion(base::TimeDelta time_stamp, |
| const gfx::Point& location) = 0; |
| |
| // Called when pointer button state changed. |changed_button_flags| contains |
| // all buttons that changed. |pressed| is true if buttons entered pressed |
| // state. |
| virtual void OnPointerButton(base::TimeDelta time_stamp, |
| int changed_button_flags, |
| bool pressed) = 0; |
| |
| // Called when pointer wheel changed. |offset| contains the direction and |
| // distance of the change. |
| virtual void OnPointerWheel(base::TimeDelta time_stamp, |
| const gfx::Vector2d& offset) = 0; |
| |
| protected: |
| virtual ~PointerDelegate() {} |
| }; |
| |
| } // namespace exo |
| |
| #endif // COMPONENTS_EXO_POINTER_DELEGATE_H_ |