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// Copyright 2016 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 <set>
#include "base/atomicops.h"
#include "base/macros.h"
#include "mojo/public/cpp/bindings/binding_set.h"
#include "mojo/public/cpp/bindings/interface_ptr_set.h"
#include "services/ui/public/interfaces/display.mojom.h"
#include "services/ui/ws/user_id.h"
namespace gfx {
class Point;
namespace ui {
namespace ws {
class Display;
class DisplayManager;
class UserDisplayManagerDelegate;
namespace test {
class UserDisplayManagerTestApi;
// Provides per user display state.
class UserDisplayManager : public mojom::DisplayManager {
UserDisplayManager(ws::DisplayManager* display_manager,
UserDisplayManagerDelegate* delegate,
const UserId& user_id);
~UserDisplayManager() override;
// Called when the frame decorations for this user change.
void OnFrameDecorationValuesChanged();
void AddDisplayManagerBinding(
mojo::InterfaceRequest<mojom::DisplayManager> request);
// Called by Display prior to |display| being removed and destroyed.
void OnWillDestroyDisplay(Display* display);
// Called from WindowManagerState when its EventDispatcher receives a mouse
// event.
void OnMouseCursorLocationChanged(const gfx::Point& point);
// Called when something about the display (e.g. pixel-ratio, size) changes.
void OnDisplayUpdate(Display* display);
// Returns a read-only handle to the shared memory which contains the global
// mouse cursor position. Each call returns a new handle.
mojo::ScopedSharedBufferHandle GetCursorLocationMemory();
friend class test::UserDisplayManagerTestApi;
// Called when a new observer is added. If frame decorations are available
// notifies the observer immediately.
void OnObserverAdded(mojom::DisplayManagerObserver* observer);
mojo::Array<mojom::WsDisplayPtr> GetAllDisplays();
// Calls OnDisplays() on |observer|.
void CallOnDisplays(mojom::DisplayManagerObserver* observer);
// Overriden from mojom::DisplayManager:
void AddObserver(mojom::DisplayManagerObserverPtr observer) override;
base::subtle::Atomic32* cursor_location_memory() {
return reinterpret_cast<base::subtle::Atomic32*>(
ws::DisplayManager* display_manager_;
UserDisplayManagerDelegate* delegate_;
const UserId user_id_;
// Set to true the first time at least one Display has valid frame values.
bool got_valid_frame_decorations_;
mojo::BindingSet<mojom::DisplayManager> display_manager_bindings_;
// WARNING: only use these once |got_valid_frame_decorations_| is true.
// Observer used for tests.
mojom::DisplayManagerObserver* test_observer_ = nullptr;
// The current location of the cursor. This is always kept up to date so we
// can atomically write this to |cursor_location_memory()| once it is created.
base::subtle::Atomic32 current_cursor_location_;
// A handle to a shared memory buffer that is one 64 bit integer long. We
// share this with any client as the same user. This buffer is lazily
// created on the first access.
mojo::ScopedSharedBufferHandle cursor_location_handle_;
// The one int32 in |cursor_location_handle_|. When we write to this
// location, we must always write to it atomically. (On the other side of the
// mojo connection, this data must be read atomically.)
mojo::ScopedSharedBufferMapping cursor_location_mapping_;
} // namespace ws
} // namespace ui