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// Copyright 2018 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 UI_AURA_NATIVE_WINDOW_OCCLUSION_TRACKER_WIN_H_
#define UI_AURA_NATIVE_WINDOW_OCCLUSION_TRACKER_WIN_H_
#include <shobjidl.h>
#include <windows.h>
#include <winuser.h>
#include <wrl/client.h>
#include <memory>
#include <vector>
#include "base/callback_forward.h"
#include "base/containers/flat_map.h"
#include "base/containers/flat_set.h"
#include "base/memory/weak_ptr.h"
#include "base/sequenced_task_runner.h"
#include "base/time/time.h"
#include "base/timer/timer.h"
#include "ui/aura/aura_export.h"
#include "ui/aura/window.h"
#include "ui/aura/window_observer.h"
#include "ui/base/win/power_setting_change_listener.h"
#include "ui/base/win/session_change_observer.h"
namespace base {
class WaitableEvent;
}
namespace gfx {
class Rect;
}
namespace aura {
// This class keeps track of whether any HWNDs are occluding any app windows.
// It notifies the host of any app window whose occlusion state changes. Most
// code should not need to use this; it's an implementation detail.
class AURA_EXPORT NativeWindowOcclusionTrackerWin
: public WindowObserver,
public ui::PowerSettingChangeListener {
public:
static NativeWindowOcclusionTrackerWin* GetOrCreateInstance();
static void DeleteInstanceForTesting();
// Enables notifying the host of |window| via SetNativeWindowOcclusionState()
// when the occlusion state has been computed.
void Enable(Window* window);
// Disables notifying the host of |window| via
// OnNativeWindowOcclusionStateChanged() when the occlusion state has been
// computed. It's not neccesary to call this when |window| is deleted because
// OnWindowDestroying calls Disable.
void Disable(Window* window);
// aura::WindowObserver:
void OnWindowVisibilityChanged(Window* window, bool visible) override;
void OnWindowDestroying(Window* window) override;
private:
friend class NativeWindowOcclusionTrackerTest;
// This class computes the occlusion state of the tracked windows.
// It runs on a separate thread, and notifies the main thread of
// the occlusion state of the tracked windows.
class WindowOcclusionCalculator {
public:
using UpdateOcclusionStateCallback = base::RepeatingCallback<void(
const base::flat_map<HWND, Window::OcclusionState>&,
bool show_all_windows)>;
// Creates WindowOcclusionCalculator instance. Must be called on UI thread.
static void CreateInstance(
scoped_refptr<base::SequencedTaskRunner> task_runner,
scoped_refptr<base::SequencedTaskRunner> ui_thread_task_runner,
UpdateOcclusionStateCallback update_occlusion_state_callback);
// Returns existing WindowOcclusionCalculator instance.
static WindowOcclusionCalculator* GetInstance() { return instance_; }
// Deletes |instance_| and signals |done_event|. Must be called on COMSTA
// thread.
static void DeleteInstanceForTesting(base::WaitableEvent* done_event);
void EnableOcclusionTrackingForWindow(HWND hwnd);
void DisableOcclusionTrackingForWindow(HWND hwnd);
// If a window becomes visible, makes sure event hooks are registered.
void HandleVisibilityChanged(bool visible);
private:
WindowOcclusionCalculator(
scoped_refptr<base::SequencedTaskRunner> task_runner,
scoped_refptr<base::SequencedTaskRunner> ui_thread_task_runner,
UpdateOcclusionStateCallback update_occlusion_state_callback);
~WindowOcclusionCalculator();
// Registers event hooks, if not registered.
void MaybeRegisterEventHooks();
// This is the callback registered to get notified of various Windows
// events, like window moving/resizing.
static void CALLBACK EventHookCallback(HWINEVENTHOOK hWinEventHook,
DWORD event,
HWND hwnd,
LONG id_object,
LONG id_child,
DWORD dwEventThread,
DWORD dwmsEventTime);
// EnumWindows callback used to iterate over all hwnds to determine
// occlusion status of all tracked root windows. Also builds up
// |current_pids_with_visible_windows_| and registers event hooks for newly
// discovered processes with visible hwnds.
static BOOL CALLBACK
ComputeNativeWindowOcclusionStatusCallback(HWND hwnd, LPARAM lParam);
// EnumWindows callback used to update the list of process ids with
// visible hwnds, |pids_for_location_change_hook_|.
static BOOL CALLBACK UpdateVisibleWindowProcessIdsCallback(HWND hwnd,
LPARAM lParam);
// Determines which processes owning visible application windows to set the
// EVENT_OBJECT_LOCATIONCHANGE event hook for and stores the pids in
// |pids_for_location_change_hook_|.
void UpdateVisibleWindowProcessIds();
// Computes the native window occlusion status for all tracked root aura
// windows in |root_window_hwnds_occlusion_state_| and notifies them if
// their occlusion status has changed.
void ComputeNativeWindowOcclusionStatus();
// Schedules an occlusion calculation |update_occlusion_delay_| time in the
// future, if one isn't already scheduled.
void ScheduleOcclusionCalculationIfNeeded();
// Registers a global event hook (not per process) for the events in the
// range from |event_min| to |event_max|, inclusive.
void RegisterGlobalEventHook(UINT event_min, UINT event_max);
// Registers the EVENT_OBJECT_LOCATIONCHANGE event hook for the process with
// passed id. The process has one or more visible, opaque windows.
void RegisterEventHookForProcess(DWORD pid);
// Registers/Unregisters the event hooks necessary for occlusion tracking
// via calls to RegisterEventHook. These event hooks are disabled when all
// tracked windows are minimized.
void RegisterEventHooks();
void UnregisterEventHooks();
// EnumWindows callback for occlusion calculation. Returns true to
// continue enumeration, false otherwise. Currently, always returns
// true because this function also updates
// |current_pids_with_visible_windows|, and needs to see all HWNDs.
bool ProcessComputeNativeWindowOcclusionStatusCallback(
HWND hwnd,
base::flat_set<DWORD>* current_pids_with_visible_windows);
// Processes events sent to OcclusionEventHookCallback.
// It generally triggers scheduling of the occlusion calculation, but
// ignores certain events in order to not calculate occlusion more than
// necessary.
void ProcessEventHookCallback(DWORD event,
HWND hwnd,
LONG idObject,
LONG idChild);
// EnumWindows callback for determining which processes to set the
// EVENT_OBJECT_LOCATIONCHANGE event hook for. We set that event hook for
// processes hosting fully visible, opaque windows.
void ProcessUpdateVisibleWindowProcessIdsCallback(HWND hwnd);
// Returns true if the window is visible, fully opaque, and on the current
// virtual desktop, false otherwise.
bool WindowCanOccludeOtherWindowsOnCurrentVirtualDesktop(
HWND hwnd,
gfx::Rect* window_rect);
// Returns true if |hwnd| is definitely on the current virtual desktop,
// false if it's definitely not on the current virtual desktop, and nullopt
// if we we can't tell for sure.
base::Optional<bool> IsWindowOnCurrentVirtualDesktop(HWND hwnd);
static WindowOcclusionCalculator* instance_;
// Task runner for our thread.
scoped_refptr<base::SequencedTaskRunner> task_runner_;
// Task runner for the thread that created |this|. UpdateOcclusionState
// task is posted to this task runner.
const scoped_refptr<base::SequencedTaskRunner> ui_thread_task_runner_;
// Callback used to update occlusion state on UI thread.
UpdateOcclusionStateCallback update_occlusion_state_callback_;
// Map of root app window hwnds and their occlusion state. This contains
// both visible and hidden windows.
base::flat_map<HWND, Window::OcclusionState>
root_window_hwnds_occlusion_state_;
// Values returned by SetWinEventHook are stored so that hooks can be
// unregistered when necessary.
std::vector<HWINEVENTHOOK> global_event_hooks_;
// Map from process id to EVENT_OBJECT_LOCATIONCHANGE event hook.
base::flat_map<DWORD, HWINEVENTHOOK> process_event_hooks_;
// Pids of processes for which the EVENT_OBJECT_LOCATIONCHANGE event hook is
// set. These are the processes hosting windows in
// |visible_and_fully_opaque_windows_|.
base::flat_set<DWORD> pids_for_location_change_hook_;
// Timer to delay occlusion update.
base::OneShotTimer occlusion_update_timer_;
// Used to keep track of whether we're in the middle of getting window move
// events, in order to wait until the window move is complete before
// calculating window occlusion.
bool window_is_moving_ = false;
// Used to determine if a root window is occluded. As we iterate through the
// hwnds in z-order, we subtract each opaque window's rect from
// |unoccluded_desktop_region_|. When we get to a root window, we subtract
// it from |unoccluded_desktop_region_|, and if |unoccluded_desktop_region_|
// doesn't change, the root window was already occluded.
SkRegion unoccluded_desktop_region_;
// Keeps track of how many root windows we need to compute the occlusion
// state of in a call to ComputeNativeWindowOcclusionStatus. Once we've
// determined the state of all root windows, we can stop subtracting
// windows from |unoccluded_desktop_region_|.
int num_root_windows_with_unknown_occlusion_state_;
// This is true if the task bar thumbnails or the alt tab thumbnails are
// showing.
bool showing_thumbnails_ = false;
// Only used on Win10+.
Microsoft::WRL::ComPtr<IVirtualDesktopManager> virtual_desktop_manager_;
SEQUENCE_CHECKER(sequence_checker_);
base::WeakPtrFactory<WindowOcclusionCalculator> weak_factory_{this};
DISALLOW_COPY_AND_ASSIGN(WindowOcclusionCalculator);
};
NativeWindowOcclusionTrackerWin();
~NativeWindowOcclusionTrackerWin() override;
// Returns true if we are interested in |hwnd| for purposes of occlusion
// calculation. We are interested in |hwnd| if it is a window that is
// visible, opaque, and bounded. If we are interested in |hwnd|, stores the
// window rectangle in |window_rect|.
static bool IsWindowVisibleAndFullyOpaque(HWND hwnd, gfx::Rect* window_rect);
// Updates root windows occclusion state. If |show_all_windows| is true,
// all non-hidden windows will be marked visible. This is used to force
// rendering of thumbnails.
void UpdateOcclusionState(const base::flat_map<HWND, Window::OcclusionState>&
root_window_hwnds_occlusion_state,
bool show_all_windows);
// This is called with session changed notifications. If the screen is locked
// by the current session, it marks app windows as occluded.
void OnSessionChange(WPARAM status_code, const bool* is_current_session);
// This is called when the display is put to sleep. If the display is sleeping
// it marks app windows as occluded.
void OnDisplayStateChanged(bool display_on) override;
// Marks all root windows as either occluded, or if hwnd IsIconic, hidden.
void MarkNonIconicWindowsOccluded();
// Task runner to call ComputeNativeWindowOcclusionStatus, and to handle
// Windows event notifications, off of the UI thread.
const scoped_refptr<base::SequencedTaskRunner> update_occlusion_task_runner_;
// Map of HWND to root app windows. Maintained on the UI thread, and used
// to send occlusion state notifications to Windows from
// |root_window_hwnds_occlusion_state_|.
base::flat_map<HWND, Window*> hwnd_root_window_map_;
// This is set by UpdateOcclusionState. It is currently only used by tests.
int num_visible_root_windows_ = 0;
// Manages observation of Windows Session Change messages.
ui::SessionChangeObserver session_change_observer_;
// Listens for Power Setting Change messages.
ui::ScopedPowerSettingChangeListener power_setting_change_listener_;
// If the screen is locked, windows are considered occluded.
bool screen_locked_ = false;
// If the display is off, windows are considered occluded.
bool display_on_ = true;
base::WeakPtrFactory<NativeWindowOcclusionTrackerWin> weak_factory_{this};
DISALLOW_COPY_AND_ASSIGN(NativeWindowOcclusionTrackerWin);
};
} // namespace aura
#endif // UI_AURA_NATIVE_WINDOW_OCCLUSION_TRACKER_WIN_H_