third_party/blink/renderer/modules/shapedetection/barcode_detector_statics.h

// Copyright 2019 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef THIRD_PARTY_BLINK_RENDERER_MODULES_SHAPEDETECTION_BARCODE_DETECTOR_STATICS_H_
#define THIRD_PARTY_BLINK_RENDERER_MODULES_SHAPEDETECTION_BARCODE_DETECTOR_STATICS_H_

#include "services/shape_detection/public/mojom/barcodedetection_provider.mojom-blink.h"
#include "third_party/blink/renderer/bindings/core/v8/script_promise.h"
#include "third_party/blink/renderer/platform/heap/garbage_collected.h"
#include "third_party/blink/renderer/platform/heap/heap_allocator.h"
#include "third_party/blink/renderer/platform/supplementable.h"
#include "third_party/blink/renderer/platform/wtf/vector.h"

namespace blink {

class ExecutionContext;
class ScriptPromiseResolver;

// This class owns the BarcodeDetectionProvider connection used to create the
// BarcodeDetector instances for this ExecutionContext.
class BarcodeDetectorStatics final
    : public GarbageCollectedFinalized<BarcodeDetectorStatics>,
      public Supplement<ExecutionContext> {
  USING_GARBAGE_COLLECTED_MIXIN(BarcodeDetectorStatics);

 public:
  static const char kSupplementName[];

  static BarcodeDetectorStatics* From(ExecutionContext*);

  explicit BarcodeDetectorStatics(ExecutionContext&);
  ~BarcodeDetectorStatics();

  void CreateBarcodeDetection(
      mojo::PendingReceiver<shape_detection::mojom::blink::BarcodeDetection>,
      shape_detection::mojom::blink::BarcodeDetectorOptionsPtr);
  ScriptPromise EnumerateSupportedFormats(ScriptState*);

  void Trace(Visitor*) override;

 private:
  void EnsureServiceConnection();
  void OnEnumerateSupportedFormats(
      ScriptPromiseResolver*,
      const Vector<shape_detection::mojom::blink::BarcodeFormat>&);
  void OnConnectionError();

  shape_detection::mojom::blink::BarcodeDetectionProviderPtr service_;

  // Holds Promises returned by EnumerateSupportedFormats() so that they can be
  // resolve in the case of a Mojo connection error.
  HeapHashSet<Member<ScriptPromiseResolver>> get_supported_format_requests_;
};

}  // namespace blink

#endif  // THIRD_PARTY_BLINK_RENDERER_MODULES_SHAPEDETECTION_BARCODE_DETECTOR_STATICS_H_