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// Copyright 2015 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef COMPONENTS_EXO_SURFACE_OBSERVER_H_
#define COMPONENTS_EXO_SURFACE_OBSERVER_H_
#include <cstdint>
#include <string>
#include <string_view>
namespace gfx {
class Rect;
}
namespace exo {
class Surface;
enum class OverlayPriority;
// Observers can listen to various events on the Surfaces.
class SurfaceObserver {
public:
// Called at the top of the surface's destructor, to give observers a
// chance to remove themselves.
virtual void OnSurfaceDestroying(Surface* surface) = 0;
virtual void OnScaleFactorChanged(Surface* surface,
float old_scale_factor,
float new_scale_factor) {}
// Called when the occlusion of the aura window corresponding to |surface|
// changes.
virtual void OnWindowOcclusionChanged(Surface* surface) {}
// Called when frame is locked to normal state or unlocked from
// previously locked state.
virtual void OnFrameLockingChanged(Surface* surface, bool lock) {}
// Called on each commit.
virtual void OnCommit(Surface* surface) {}
// Called when desk state of the window changes.
// |state| is the index of the desk which the window moved to,
// or -1 for a window assigned to all desks.
virtual void OnDeskChanged(Surface* surface, int state) {}
// Called when the display of this surface has changed. Only called after
// successfully updating sub-surfaces.
virtual void OnDisplayChanged(Surface* surface,
int64_t old_display,
int64_t new_display) {}
// Starts or ends throttling.
virtual void ThrottleFrameRate(bool on) {}
// Called when tooltip is shown.
// `bounds` is relative to `surface`.
virtual void OnTooltipShown(Surface* surface,
std::u16string_view text,
const gfx::Rect& bounds) {}
// Called when tooltip is hidden.
virtual void OnTooltipHidden(Surface* surface) {}
virtual void OnFullscreenStateChanged(bool fullscreen) {}
virtual void OnOverlayPriorityHintChanged(
OverlayPriority overlay_priority_hint) {}
protected:
virtual ~SurfaceObserver() = default;
};
} // namespace exo
#endif // COMPONENTS_EXO_SURFACE_OBSERVER_H_
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