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// Copyright 2014 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_TREE_HOST_OBSERVER_H_
#define UI_AURA_WINDOW_TREE_HOST_OBSERVER_H_
#include "base/containers/flat_set.h"
#include "components/viz/common/surfaces/frame_sink_id.h"
#include "ui/aura/aura_export.h"
#include "ui/aura/window.h"
class SkRegion;
namespace aura {
class WindowTreeHost;
class AURA_EXPORT WindowTreeHostObserver {
public:
// Called when the host's client size has changed.
virtual void OnHostResized(WindowTreeHost* host) {}
// Called when the host is moved on screen.
virtual void OnHostMovedInPixels(WindowTreeHost* host) {}
// Called when the host is moved to a different workspace.
virtual void OnHostWorkspaceChanged(WindowTreeHost* host) {}
// Called when the native window system sends the host request to close.
virtual void OnHostCloseRequested(WindowTreeHost* host) {}
// Called when the occlusion status of the native window changes, iff
// occlusion tracking is enabled for a descendant of the root.
virtual void OnOcclusionStateChanged(WindowTreeHost* host,
Window::OcclusionState new_state,
const SkRegion& occluded_region) {}
// Called before processing a bounds change. The bounds change may result in
// one or both of OnHostResized() and OnHostMovedInPixels() being called.
// This is not supported by all WindowTreeHosts.
// OnHostWillProcessBoundsChange() is always followed by
// OnHostDidProcessBoundsChange().
virtual void OnHostWillProcessBoundsChange(WindowTreeHost* host) {}
virtual void OnHostDidProcessBoundsChange(WindowTreeHost* host) {}
virtual void OnCompositingFrameSinksToThrottleUpdated(
const aura::WindowTreeHost* host,
const base::flat_set<viz::FrameSinkId>& ids) {}
virtual void OnSetPreferredRefreshRate(WindowTreeHost* host,
float preferred_refresh_rate) {}
// Called when the local surface id of the frame sink embedded in `host` has
// changed.
virtual void OnLocalSurfaceIdChanged(WindowTreeHost* host,
const viz::LocalSurfaceId& id) {}
protected:
virtual ~WindowTreeHostObserver() {}
};
} // namespace aura
#endif // UI_AURA_WINDOW_TREE_HOST_OBSERVER_H_
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