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// Copyright (c) 2012 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 <stdint.h>
#include <memory>
#include <string>
#include "base/containers/flat_map.h"
#include "base/containers/flat_set.h"
#include "base/macros.h"
#include "base/memory/weak_ptr.h"
#include "base/observer_list.h"
#include "base/optional.h"
#include "base/time/time.h"
#include "components/viz/common/surfaces/frame_sink_id.h"
#include "components/viz/common/surfaces/local_surface_id.h"
#include "ui/aura/aura_export.h"
#include "ui/aura/window.h"
#include "ui/base/cursor/cursor.h"
#include "ui/base/ime/input_method_delegate.h"
#include "ui/compositor/compositor_observer.h"
#include "ui/display/display_observer.h"
#include "ui/events/event_source.h"
#include "ui/events/platform_event.h"
#include "ui/gfx/native_widget_types.h"
namespace gfx {
class Point;
class Rect;
class Size;
class Transform;
namespace ui {
class Compositor;
enum class DomCode;
class EventSink;
class InputMethod;
class ViewProp;
struct PlatformWindowInitProperties;
namespace aura {
namespace test {
class WindowTreeHostTestApi;
class Env;
class ScopedKeyboardHook;
class WindowEventDispatcher;
class WindowTreeHostObserver;
// WindowTreeHost bridges between a native window and the embedded RootWindow.
// It provides the accelerated widget and maps events from the native os to
// aura.
class AURA_EXPORT WindowTreeHost : public ui::internal::InputMethodDelegate,
public ui::EventSource,
public display::DisplayObserver,
public ui::CompositorObserver {
~WindowTreeHost() override;
// Creates a new WindowTreeHost with the specified |properties| and an
// optional |env|. If |env| is null, the default Env::GetInstance() is used.
static std::unique_ptr<WindowTreeHost> Create(
ui::PlatformWindowInitProperties properties,
Env* env = nullptr);
// Returns the WindowTreeHost for the specified accelerated widget, or NULL
// if there is none associated.
static WindowTreeHost* GetForAcceleratedWidget(gfx::AcceleratedWidget widget);
void InitHost();
void AddObserver(WindowTreeHostObserver* observer);
void RemoveObserver(WindowTreeHostObserver* observer);
bool HasObserver(const WindowTreeHostObserver* observer) const;
Window* window() { return window_; }
const Window* window() const { return window_; }
// TODO(msw): Remove this, callers should use GetEventSink().
ui::EventSink* event_sink();
WindowEventDispatcher* dispatcher() {
return const_cast<WindowEventDispatcher*>(
const_cast<const WindowTreeHost*>(this)->dispatcher());
const WindowEventDispatcher* dispatcher() const { return dispatcher_.get(); }
ui::Compositor* compositor() { return compositor_.get(); }
base::WeakPtr<WindowTreeHost> GetWeakPtr();
// Gets/Sets the root window's transform.
virtual gfx::Transform GetRootTransform() const;
virtual void SetRootTransform(const gfx::Transform& transform);
virtual gfx::Transform GetInverseRootTransform() const;
// These functions are used in event translation for translating the local
// coordinates of LocatedEvents. Default implementation calls to non-local
// ones (e.g. GetRootTransform()).
virtual gfx::Transform GetRootTransformForLocalEventCoordinates() const;
virtual gfx::Transform GetInverseRootTransformForLocalEventCoordinates()
// Updates the root window's size using |host_size_in_pixels|, current
// transform and outsets.
// TODO(ccameron): Make this function no longer public. The interaction
// between this call, GetBounds, and OnHostResizedInPixels is ambiguous and
// allows for inconsistencies.
void UpdateRootWindowSizeInPixels();
// Converts |point| from the root window's coordinate system to native
// screen's.
void ConvertDIPToScreenInPixels(gfx::Point* point) const;
// Converts |point| from native screen coordinate system to the root window's.
void ConvertScreenInPixelsToDIP(gfx::Point* point) const;
// Converts |point| from the root window's coordinate system to the
// host window's.
virtual void ConvertDIPToPixels(gfx::Point* point) const;
// Converts |point| from the host window's coordinate system to the
// root window's.
virtual void ConvertPixelsToDIP(gfx::Point* point) const;
// Cursor.
// Sets the currently-displayed cursor. If the cursor was previously hidden
// via ShowCursor(false), it will remain hidden until ShowCursor(true) is
// called, at which point the cursor that was last set via SetCursor() will be
// used.
void SetCursor(gfx::NativeCursor cursor);
// Invoked when the cursor's visibility has changed.
void OnCursorVisibilityChanged(bool visible);
// Moves the cursor to the specified location relative to the root window.
void MoveCursorToLocationInDIP(const gfx::Point& location_in_dip);
// Moves the cursor to the |location_in_pixels| given in host coordinates.
void MoveCursorToLocationInPixels(const gfx::Point& location_in_pixels);
gfx::NativeCursor last_cursor() const { return last_cursor_; }
// Gets the InputMethod instance, if NULL, creates & owns it.
ui::InputMethod* GetInputMethod();
bool has_input_method() const { return input_method_ != nullptr; }
// Sets a shared unowned InputMethod. This is used when there is a singleton
// InputMethod shared between multiple WindowTreeHost instances.
// This is used for Ash only. There are 2 reasons:
// 1) ChromeOS virtual keyboard needs to receive ShowVirtualKeyboardIfEnabled
// notification from InputMethod. Multiple InputMethod instances makes it hard
// to register/unregister the observer for that notification. 2) For Ozone,
// there is no native focus state for the root window and WindowTreeHost. See
// DrmWindowHost::CanDispatchEvent, the key events always goes to the primary
// WindowTreeHost. And after InputMethod processed the key event and continue
// dispatching it, WindowTargeter::FindTargetForEvent may re-dispatch it to a
// different WindowTreeHost. So the singleton InputMethod can make sure the
// correct InputMethod instance processes the key event no matter which
// WindowTreeHost is the target for event. Please refer to the test:
// ExtendedDesktopTest.KeyEventsOnLockScreen.
// TODO(shuchen): remove this method after above reasons become invalid.
// A possible solution is to make sure DrmWindowHost can find the correct
// WindowTreeHost to dispatch events.
void SetSharedInputMethod(ui::InputMethod* input_method);
// Overridden from ui::internal::InputMethodDelegate:
ui::EventDispatchDetails DispatchKeyEventPostIME(
ui::KeyEvent* event,
DispatchKeyEventPostIMECallback callback) final;
// Overridden from ui::EventSource:
ui::EventSink* GetEventSink() override;
// Returns the id of the display. Default implementation queries Screen.
virtual int64_t GetDisplayId();
// Returns the EventSource responsible for dispatching events to the window
// tree.
virtual ui::EventSource* GetEventSource() = 0;
// Returns the accelerated widget.
virtual gfx::AcceleratedWidget GetAcceleratedWidget() = 0;
// Shows the WindowTreeHost.
void Show();
// Hides the WindowTreeHost.
void Hide();
// Sets/Gets the bounds of the WindowTreeHost (in pixels). Note that a call to
// GetBoundsInPixels() immediately following a SetBoundsInPixels() can return
// the old bounds, because SetBoundsInPixels() can take effect asynchronously,
// depending on the platform. The |local_surface_id| takes effect when (and
// if) the new size is confirmed (potentially asynchronously) by the platform.
// If |local_surface_id| is invalid, then a new LocalSurfaceId is allocated
// when the size change takes effect.
virtual void SetBoundsInPixels(
const gfx::Rect& bounds_in_pixels,
const viz::LocalSurfaceIdAllocation& local_surface_id_allocation =
viz::LocalSurfaceIdAllocation()) = 0;
virtual gfx::Rect GetBoundsInPixels() const = 0;
// Sets the OS capture to the root window.
virtual void SetCapture() = 0;
// Releases OS capture of the root window.
virtual void ReleaseCapture() = 0;
// Returns the device scale assumed by the WindowTreeHost (set during the
// most recent call to OnHostResizedInPixels).
float device_scale_factor() const { return device_scale_factor_; }
// Requests that |keys| be intercepted at the platform level and routed
// directly to the web content. If |codes| is empty, all keys will be
// intercepted. Returns a ScopedKeyboardHook instance which stops capturing
// system key events when destroyed.
std::unique_ptr<ScopedKeyboardHook> CaptureSystemKeyEvents(
base::Optional<base::flat_set<ui::DomCode>> codes);
// Returns a map of KeyboardEvent code to KeyboardEvent key values.
virtual base::flat_map<std::string, std::string> GetKeyboardLayoutMap() = 0;
// Returns true if KeyEvents should be send to IME. This is called from
// WindowEventDispatcher during event dispatch.
virtual bool ShouldSendKeyEventToIme();
// Enables native window occlusion tracking for the native window this host
// represents.
virtual void EnableNativeWindowOcclusionTracking();
// Disables native window occlusion tracking for the native window this host
// represents.
virtual void DisableNativeWindowOcclusionTracking();
// Remembers the current occlusion state, and if it has changed, notifies
// observers of the change.
virtual void SetNativeWindowOcclusionState(Window::OcclusionState state);
friend class ScopedKeyboardHook;
friend class TestScreen; // TODO(beng): see if we can remove/consolidate.
explicit WindowTreeHost(std::unique_ptr<Window> window = nullptr);
// Set the cached display device scale factor. This should only be called
// during subclass initialization, when the value is needed before InitHost().
void IntializeDeviceScaleFactor(float device_scale_factor);
void DestroyCompositor();
void DestroyDispatcher();
// If frame_sink_id is not passed in, one will be grabbed from
// ContextFactoryPrivate. |are_events_in_pixels| indicates if events are
// received in pixels. If |are_events_in_pixels| is false, events are
// received in DIPs. See Compositor() for details on |trace_environment_name|
// and |automatically_allocate_surface_ids|.
void CreateCompositor(
const viz::FrameSinkId& frame_sink_id = viz::FrameSinkId(),
bool force_software_compositor = false,
ui::ExternalBeginFrameClient* external_begin_frame_client = nullptr,
bool are_events_in_pixels = true,
const char* trace_environment_name = nullptr,
bool automatically_allocate_surface_ids = true);
void InitCompositor();
void OnAcceleratedWidgetAvailable();
// Returns the location of the RootWindow on native screen.
virtual gfx::Point GetLocationOnScreenInPixels() const = 0;
void OnHostMovedInPixels(const gfx::Point& new_location_in_pixels);
void OnHostResizedInPixels(
const gfx::Size& new_size_in_pixels,
const viz::LocalSurfaceIdAllocation& local_surface_id_allocation =
void OnHostWorkspaceChanged();
void OnHostDisplayChanged();
void OnHostCloseRequested();
void OnHostLostWindowCapture();
// Sets the currently displayed cursor.
virtual void SetCursorNative(gfx::NativeCursor cursor) = 0;
// Moves the cursor to the specified location relative to the root window.
virtual void MoveCursorToScreenLocationInPixels(
const gfx::Point& location_in_pixels) = 0;
// Called when the cursor visibility has changed.
virtual void OnCursorVisibilityChangedNative(bool show) = 0;
// Shows the WindowTreeHost.
virtual void ShowImpl() = 0;
// Hides the WindowTreeHost.
virtual void HideImpl() = 0;
// display::DisplayObserver implementation.
void OnDisplayMetricsChanged(const display::Display& display,
uint32_t metrics) override;
// Begins capturing system key events. Returns true if successful.
virtual bool CaptureSystemKeyEventsImpl(
base::Optional<base::flat_set<ui::DomCode>> dom_codes) = 0;
// Stops capturing system keyboard events.
virtual void ReleaseSystemKeyEventCapture() = 0;
// True if |dom_code| is reserved for an active KeyboardLock request.
virtual bool IsKeyLocked(ui::DomCode dom_code) = 0;
virtual gfx::Rect GetTransformedRootWindowBoundsInPixels(
const gfx::Size& size_in_pixels) const;
// Returns true if a LocalSurfaceId should be allocated when the size changes
// and a LocalSurfaceId was not supplied.
virtual bool ShouldAllocateLocalSurfaceIdOnResize();
const base::ObserverList<WindowTreeHostObserver>::Unchecked& observers()
const {
return observers_;
friend class test::WindowTreeHostTestApi;
// Moves the cursor to the specified location. This method is internally used
// by MoveCursorToLocationInDIP() and MoveCursorToLocationInPixels().
void MoveCursorToInternal(const gfx::Point& root_location,
const gfx::Point& host_location);
// Overrided from CompositorObserver:
void OnCompositingEnded(ui::Compositor* compositor) override;
void OnCompositingChildResizing(ui::Compositor* compositor) override;
void OnCompositingShuttingDown(ui::Compositor* compositor) override;
// We don't use a std::unique_ptr for |window_| since we need this ptr to be
// valid during its deletion. (Window's dtor notifies observers that may
// attempt to reach back up to access this object which will be valid until
// the end of the dtor).
Window* window_; // Owning.
// Keeps track of the occlusion state of the host, and used to send
// notifications to observers when it changes.
Window::OcclusionState occlusion_state_;
base::ObserverList<WindowTreeHostObserver>::Unchecked observers_;
std::unique_ptr<WindowEventDispatcher> dispatcher_;
std::unique_ptr<ui::Compositor> compositor_;
// The device scale factor is snapshotted in OnHostResizedInPixels.
// NOTE: this value is cached rather than looked up from the Display as it is
// entirely possible for the Display to be updated *after* |this|. For
// example, display changes on Windows first result in the HWND bounds
// changing and are then followed by changes to the set of displays
// TODO(ccameron): The size and location from OnHostResizedInPixels and
// OnHostMovedInPixels should be snapshotted here as well.
float device_scale_factor_ = 1.f;
// Last cursor set. Used for testing.
gfx::NativeCursor last_cursor_;
gfx::Point last_cursor_request_position_in_host_;
std::unique_ptr<ui::ViewProp> prop_;
// The InputMethod instance used to process key events.
// If owned it, it is created in GetInputMethod() method;
// If not owned it, it is passed in through SetSharedInputMethod() method.
ui::InputMethod* input_method_;
// Whether the InputMethod instance is owned by this WindowTreeHost.
bool owned_input_method_;
// Set to the time the synchronization event began.
base::TimeTicks synchronization_start_time_;
// Set to true if this WindowTreeHost is currently holding pointer moves.
bool holding_pointer_moves_ = false;
base::WeakPtrFactory<WindowTreeHost> weak_factory_;
} // namespace aura