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// Copyright 2020 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_NATIVE_WINDOW_OCCLUSION_TRACKER_H_
#define UI_AURA_NATIVE_WINDOW_OCCLUSION_TRACKER_H_
#include "build/build_config.h"
#include "ui/aura/aura_export.h"
namespace aura {
class WindowTreeHost;
// This class is a shim between WindowOcclusionTracker and os-specific
// window occlusion tracking classes (currently just
// NativeWindowOcclusionTrackerWin).
class AURA_EXPORT NativeWindowOcclusionTracker {
public:
NativeWindowOcclusionTracker() = delete;
NativeWindowOcclusionTracker(const NativeWindowOcclusionTracker&) = delete;
NativeWindowOcclusionTracker& operator=(const NativeWindowOcclusionTracker&) =
delete;
~NativeWindowOcclusionTracker() = delete;
// Enables native window occlusion tracking for the native window |host|
// represents.
static void EnableNativeWindowOcclusionTracking(WindowTreeHost* host);
// Disables native window occlusion tracking for the native window |host|
// represents.
static void DisableNativeWindowOcclusionTracking(WindowTreeHost* host);
// Returns whether native window occlusion tracking is always enabled.
static bool IsNativeWindowOcclusionTrackingAlwaysEnabled(
WindowTreeHost* host);
private:
friend class WindowTreeHostWithReleaseTest;
friend class WindowTreeHostWithThrottleTest;
friend class WindowTreeHostWithThrottleAndReleaseTest;
};
} // namespace aura
#endif // UI_AURA_NATIVE_WINDOW_OCCLUSION_TRACKER_H_
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