components/payments/content/payment_request_display_manager.h

// Copyright 2017 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 COMPONENTS_PAYMENTS_CONTENT_PAYMENT_REQUEST_DISPLAY_MANAGER_H_
#define COMPONENTS_PAYMENTS_CONTENT_PAYMENT_REQUEST_DISPLAY_MANAGER_H_

#include <memory>

#include "base/macros.h"
#include "components/keyed_service/core/keyed_service.h"

namespace payments {

class ContentPaymentRequestDelegate;
class PaymentRequest;

// This KeyedService is responsible for displaying and hiding Payment Request
// UI. It ensures that only one Payment Request is showing per profile.
class PaymentRequestDisplayManager : public KeyedService {
 public:
  class DisplayHandle {
   public:
    explicit DisplayHandle(PaymentRequestDisplayManager* display_manager);
    ~DisplayHandle();
    void Show(ContentPaymentRequestDelegate* delegate, PaymentRequest* request);

   private:
    PaymentRequestDisplayManager* display_manager_;
    DISALLOW_COPY_AND_ASSIGN(DisplayHandle);
  };

  PaymentRequestDisplayManager();
  ~PaymentRequestDisplayManager() override;

  // If no PaymentRequest is currently showing, returns a unique_ptr to a
  // display handle that can be used to display the PaymentRequest dialog. The
  // UI is considered open until the handle object is deleted.
  std::unique_ptr<DisplayHandle> TryShow();

 private:
  void SetHandleAlive(bool handle_alive);

  bool handle_alive_;

  DISALLOW_COPY_AND_ASSIGN(PaymentRequestDisplayManager);
};

}  // namespace payments

#endif  // COMPONENTS_PAYMENTS_CONTENT_PAYMENT_REQUEST_DISPLAY_MANAGER_H_