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// Copyright 2024 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef CONTENT_BROWSER_ACCESSIBILITY_ACCESSIBILITY_TREE_SNAPSHOT_COMBINER_H_
#define CONTENT_BROWSER_ACCESSIBILITY_ACCESSIBILITY_TREE_SNAPSHOT_COMBINER_H_
#include "base/memory/ref_counted.h"
#include "content/common/frame.mojom.h"
#include "ui/accessibility/ax_tree_combiner.h"
namespace content {
class RenderFrameHostImpl;
// Helper class for use during one-off accessibility tree snapshots. This class
// combines AXTreeUpdates into a single AXTreeUpdate using the AXTreeCombiner.
// The class is RefCounted, and when there are no more references and the
// destructor is called, the class will call AXTreeCombiner::Combine and pass
// the resulting AXTreeUpdate to the provided callback.
class AccessibilityTreeSnapshotCombiner
: public base::RefCounted<AccessibilityTreeSnapshotCombiner> {
public:
AccessibilityTreeSnapshotCombiner(
base::OnceCallback<void(ui::AXTreeUpdate&)> callback,
mojom::SnapshotAccessibilityTreeParamsPtr params);
// This method will request a snapshot for the given RenderFrameHostImpl. The
// snapshot will be completed asynchronously, and when |this| is destroyed,
// the AXTreeUpdate for this snapshot will be combined with any others into a
// single update that is passed to the callback provided in the constructor.
void RequestSnapshotOnRenderFrameHost(RenderFrameHostImpl* rfhi);
private:
friend class base::RefCounted<AccessibilityTreeSnapshotCombiner>;
~AccessibilityTreeSnapshotCombiner();
void ReceiveSnapshotFromRenderFrameHost(bool is_root,
ui::AXTreeUpdate& snapshot);
ui::AXTreeCombiner combiner_;
base::OnceCallback<void(ui::AXTreeUpdate&)> callback_;
mojom::SnapshotAccessibilityTreeParamsPtr params_;
};
} // namespace content
#endif // CONTENT_BROWSER_ACCESSIBILITY_ACCESSIBILITY_TREE_SNAPSHOT_COMBINER_H_
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