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// 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_H_
#define COMPONENTS_EXO_POINTER_H_
#include <memory>
#include "base/macros.h"
#include "base/memory/weak_ptr.h"
#include "base/unguessable_token.h"
#include "components/exo/surface_delegate.h"
#include "components/exo/surface_observer.h"
#include "components/exo/wm_helper.h"
#include "ui/base/cursor/cursor.h"
#include "ui/events/event_handler.h"
#include "ui/gfx/geometry/point.h"
#include "ui/gfx/geometry/point_f.h"
#include "ui/gfx/native_widget_types.h"
namespace cc {
class CopyOutputResult;
}
namespace ui {
class Event;
class MouseEvent;
}
namespace exo {
class PointerDelegate;
class Surface;
// This class implements a client pointer that represents one or more input
// devices, such as mice, which control the pointer location and pointer focus.
class Pointer : public ui::EventHandler,
public WMHelper::CursorObserver,
public SurfaceDelegate,
public SurfaceObserver {
public:
explicit Pointer(PointerDelegate* delegate);
~Pointer() override;
// Set the pointer surface, i.e., the surface that contains the pointer image
// (cursor). The |hotspot| argument defines the position of the pointer
// surface relative to the pointer location. Its top-left corner is always at
// (x, y) - (hotspot.x, hotspot.y), where (x, y) are the coordinates of the
// pointer location, in surface local coordinates.
void SetCursor(Surface* surface, const gfx::Point& hotspot);
// Returns the current cursor for the pointer.
gfx::NativeCursor GetCursor();
// Overridden from ui::EventHandler:
void OnMouseEvent(ui::MouseEvent* event) override;
void OnScrollEvent(ui::ScrollEvent* event) override;
// Overridden from WMHelper::CursorObserver:
void OnCursorSetChanged(ui::CursorSetType cursor_set) override;
// Overridden from SurfaceDelegate:
void OnSurfaceCommit() override;
bool IsSurfaceSynchronized() const override;
// Overridden from SurfaceObserver:
void OnSurfaceDestroying(Surface* surface) override;
private:
// Returns the effective target for |event|.
Surface* GetEffectiveTargetForEvent(ui::Event* event) const;
// Recompute cursor scale and update cursor if scale changed.
void UpdateCursorScale();
// Asynchronously update the cursor by capturing a snapshot of |surface_|.
void CaptureCursor();
// Called when cursor snapshot has been captured.
void OnCursorCaptured(const gfx::Point& hotspot,
std::unique_ptr<cc::CopyOutputResult> result);
// Update cursor to reflect the current value of |cursor_|.
void UpdateCursor();
// The delegate instance that all events are dispatched to.
PointerDelegate* const delegate_;
// The current pointer surface.
Surface* surface_ = nullptr;
// The current focus surface for the pointer.
Surface* focus_ = nullptr;
// The location of the pointer in the current focus surface.
gfx::PointF location_;
// The scale applied to the cursor to compensate for the UI scale.
float cursor_scale_ = 1.0f;
// The position of the pointer surface relative to the pointer location.
gfx::Point hotspot_;
// The current cursor.
ui::Cursor cursor_;
// Source used for cursor capture copy output requests.
const base::UnguessableToken cursor_capture_source_id_;
// Weak pointer factory used for cursor capture callbacks.
base::WeakPtrFactory<Pointer> cursor_capture_weak_ptr_factory_;
DISALLOW_COPY_AND_ASSIGN(Pointer);
};
} // namespace exo
#endif // COMPONENTS_EXO_POINTER_H_
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