chromium/ui/aura/window_occlusion_tracker.h

// Copyright 2017 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef UI_AURA_WINDOW_OCCLUSION_TRACKER_H_
#define UI_AURA_WINDOW_OCCLUSION_TRACKER_H_

#include <memory>
#include <utility>

#include "base/containers/flat_map.h"
#include "base/containers/flat_set.h"
#include "base/functional/callback.h"
#include "base/memory/raw_ptr.h"
#include "base/scoped_multi_source_observation.h"
#include "third_party/skia/include/core/SkRegion.h"
#include "ui/aura/aura_export.h"
#include "ui/aura/window.h"
#include "ui/aura/window_observer.h"
#include "ui/aura/window_tree_host_observer.h"
#include "ui/compositor/layer.h"
#include "ui/compositor/layer_animation_observer.h"
#include "ui/compositor/layer_animator.h"
#include "ui/compositor/layer_observer.h"

struct SkIRect;

namespace gfx {
class Transform;
}

namespace aura {

namespace test {
class WindowOcclusionTrackerTestApi;
}

class WindowOcclusionChangeBuilder;

// Notifies tracked Windows when their occlusion state change.
//
// To start tracking the occlusion state of a Window, call
//   aura::Window::TrackOcclusionState()
//
// A Window is occluded if its bounds and transform are not animated and one of
// these conditions is true:
// - The Window is hidden (Window::IsVisible() is true).
// - The bounds of the Window are completely covered by opaque and axis-aligned
//   Windows whose bounds and transform are not animated.
// Note that an occluded window may be drawn on the screen by window switching
// features such as "Alt-Tab" or "Overview".
class AURA_EXPORT WindowOcclusionTracker : public ui::LayerAnimationObserver,
                                           public ui::LayerObserver,
                                           public WindowObserver,
                                           public WindowTreeHostObserver { … };

}  // namespace aura

#endif  // UI_AURA_WINDOW_OCCLUSION_TRACKER_H_