mirror of
https://github.com/flutter/flutter.git
synced 2026-02-20 02:29:02 +08:00
30 lines
969 B
C++
30 lines
969 B
C++
// Copyright 2013 The Flutter Authors. All rights reserved.
|
|
// Use of this source code is governed by a BSD-style license that can be
|
|
// found in the LICENSE file.
|
|
|
|
#include "flutter/flow/raster_cache_key.h"
|
|
#include <optional>
|
|
#include "flutter/flow/layers/container_layer.h"
|
|
#include "flutter/flow/layers/display_list_layer.h"
|
|
#include "flutter/flow/layers/layer.h"
|
|
namespace flutter {
|
|
|
|
//
|
|
|
|
std::optional<std::vector<RasterCacheKeyID>> RasterCacheKeyID::LayerChildrenIds(
|
|
const Layer* layer) {
|
|
FML_DCHECK(layer->as_container_layer());
|
|
auto& children_layers = layer->as_container_layer()->layers();
|
|
auto children_count = children_layers.size();
|
|
if (children_count == 0) {
|
|
return std::nullopt;
|
|
}
|
|
std::vector<RasterCacheKeyID> ids;
|
|
std::transform(
|
|
children_layers.begin(), children_layers.end(), std::back_inserter(ids),
|
|
[](auto& layer) -> RasterCacheKeyID { return layer->caching_key_id(); });
|
|
return ids;
|
|
}
|
|
|
|
} // namespace flutter
|