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// Copyright 2025 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_COMPOSITOR_COMPOSITOR_PROPERTY_TREE_DELEGATE_H_
#define UI_COMPOSITOR_COMPOSITOR_PROPERTY_TREE_DELEGATE_H_
#include "base/memory/raw_ptr.h"
#include "cc/cc_export.h"
#include "cc/input/scroll_snap_data.h"
#include "cc/paint/element_id.h"
#include "cc/trees/mutator_host_client.h"
#include "cc/trees/property_tree_delegate.h"
#include "cc/trees/property_tree_layer_tree_delegate.h"
#include "ui/compositor/compositor_export.h"
namespace gfx {
class Vector2dF;
class Transform;
} // namespace gfx
namespace cc {
class LayerTreeHost;
struct ViewportPropertyIds;
}
namespace ui {
class Compositor;
// TODO(crbug.com/389771428): This class exists to gradually move the
// Compositor from using the cc::Compositor in legacy layer tree mode
// to using it in property tree / layer list mode. This class should be
// removed once that migration is done and we can just use the
// cc::Compositor's default logic for property tree / layer list mode.
class COMPOSITOR_EXPORT CompositorPropertyTreeDelegate
: public cc::PropertyTreeLayerTreeDelegate {
public:
// This class exists for testing purposes, so that tests can probe the
// property trees once they've been updated.
class Observer {
public:
// Called when UpdatePropertyTreesIfNeeded is finished.
virtual void OnUpdateCalled(cc::LayerTreeHost* host) = 0;
protected:
virtual ~Observer() = default;
};
CompositorPropertyTreeDelegate() = default;
CompositorPropertyTreeDelegate(const CompositorPropertyTreeDelegate&) =
delete;
CompositorPropertyTreeDelegate& operator=(
const CompositorPropertyTreeDelegate&) = delete;
~CompositorPropertyTreeDelegate() override = default;
void set_compositor(Compositor* compositor) { compositor_ = compositor; }
void SetObserverForTesting(Observer*);
// PropertyTreeDelegate overrides.
void UpdatePropertyTreesIfNeeded() override;
void UpdateScrollOffsetFromImpl(
const cc::ElementId& id,
const gfx::Vector2dF& delta,
const std::optional<cc::TargetSnapAreaElementIds>& snap_target_ids)
override;
void OnAnimateLayers() override;
void RegisterViewportPropertyIds(const cc::ViewportPropertyIds& ids) override;
void OnUnregisterElement(cc::ElementId id) override;
bool IsElementInPropertyTrees(cc::ElementId element_id,
cc::ElementListType list_type) const override;
void OnElementFilterMutated(cc::ElementId element_id,
cc::ElementListType list_type,
const cc::FilterOperations& filters) override;
void OnElementBackdropFilterMutated(
cc::ElementId element_id,
cc::ElementListType list_type,
const cc::FilterOperations& backdrop_filters) override;
void OnElementOpacityMutated(cc::ElementId element_id,
cc::ElementListType list_type,
float opacity) override;
void OnElementTransformMutated(cc::ElementId element_id,
cc::ElementListType list_type,
const gfx::Transform& transform) override;
private:
raw_ptr<Compositor> compositor_ = nullptr;
raw_ptr<Observer> observer_ = nullptr;
};
} // namespace ui
#endif // UI_COMPOSITOR_COMPOSITOR_PROPERTY_TREE_DELEGATE_H_
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