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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 CC_TREES_PROPERTY_TREE_DELEGATE_H_
#define CC_TREES_PROPERTY_TREE_DELEGATE_H_
#include <optional>
#include "cc/input/scroll_snap_data.h"
#include "cc/paint/element_id.h"
#include "cc/trees/mutator_host_client.h"
namespace gfx {
class Vector2dF;
class Transform;
} // namespace gfx
namespace cc {
class LayerTreeHost;
struct ViewportPropertyIds;
// This is an interface that LayerTreeHosts and LayerTreeHostClients can
// implement to control how the host's property trees are kept up to date.
// There are two default implementations, in PropertyTreeLayerListDelegate and
// PropertyTreeLayerTreeDelegate, depending on whether the LayerTreeHost is in
// layer list mode or not, but the client can also provide its own delegate via
// the `LayerTreeHost::InitParams.property_tree_delegate` field.
// TODO(crbug.com/389771428): This will eventually be removed once the
// ui::Compositor has been updated to use a LayerTreeHost in layer list mode.
// The multiple implementations will no longer be needed and the
// PropertyTreeLayerListDelegate's implementation can be merged back into the
// LayerTreeHost (if so desired).
class PropertyTreeDelegate {
public:
virtual ~PropertyTreeDelegate() = default;
virtual void SetLayerTreeHost(LayerTreeHost* host) = 0;
virtual LayerTreeHost* host() = 0;
virtual const LayerTreeHost* host() const = 0;
// Called by LayerTreeHost::DoUpdateLayers() to ensure that the
// property trees are up-to-date.
virtual void UpdatePropertyTreesIfNeeded() = 0;
virtual void UpdateScrollOffsetFromImpl(
const ElementId& id,
const gfx::Vector2dF& delta,
const std::optional<TargetSnapAreaElementIds>& snap_target_ids) = 0;
virtual void OnAnimateLayers() = 0;
virtual void RegisterViewportPropertyIds(const ViewportPropertyIds& ids) = 0;
virtual void OnUnregisterElement(ElementId id) = 0;
virtual bool IsElementInPropertyTrees(ElementId element_id,
ElementListType list_type) const = 0;
virtual void OnElementFilterMutated(ElementId element_id,
ElementListType list_type,
const FilterOperations& filters) = 0;
virtual void OnElementBackdropFilterMutated(
ElementId element_id,
ElementListType list_type,
const FilterOperations& backdrop_filters) = 0;
virtual void OnElementOpacityMutated(ElementId element_id,
ElementListType list_type,
float opacity) = 0;
virtual void OnElementTransformMutated(ElementId element_id,
ElementListType list_type,
const gfx::Transform& transform) = 0;
};
} // namespace cc
#endif // CC_TREES_PROPERTY_TREE_DELEGATE_H_
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