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- // Copyright 2021 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 ASH_WEBUI_SAMPLE_SYSTEM_WEB_APP_UI_SAMPLE_PAGE_HANDLER_H_
- #define ASH_WEBUI_SAMPLE_SYSTEM_WEB_APP_UI_SAMPLE_PAGE_HANDLER_H_
- #include <memory>
- #include "ash/webui/sample_system_web_app_ui/mojom/sample_system_web_app_ui.mojom.h"
- #include "base/memory/weak_ptr.h"
- #include "base/one_shot_event.h"
- #include "mojo/public/cpp/bindings/pending_receiver.h"
- #include "mojo/public/cpp/bindings/pending_remote.h"
- #include "mojo/public/cpp/bindings/receiver.h"
- #include "mojo/public/cpp/bindings/remote.h"
- #include "mojo/public/mojom/base/string16.mojom.h"
- namespace ash {
- // Implements the PageHandler interface. For illustration purposes this
- // class also interacts with a remote Page. There are five examples of
- // interaction.
- // 1. The UI fetches "preferences" (an example of "get")
- // 2. The UI sends a message, (an example of "set")
- // 3. The UI asks the PageHandler to execute an action (DoSomething).
- // 4. The PageHandler notifies the page about an event.
- class PageHandler : public mojom::sample_swa::PageHandler {
- public:
- PageHandler();
- ~PageHandler() override;
- PageHandler(const PageHandler&) = delete;
- PageHandler& operator=(const PageHandler&) = delete;
- // Called when a child page wants to bind its interface in `page_`, so they
- // can communicate via Mojo.
- void CreateParentPage(
- mojo::PendingRemote<mojom::sample_swa::ChildUntrustedPage>
- child_untrusted_page,
- mojo::PendingReceiver<mojom::sample_swa::ParentTrustedPage>
- parent_trusted_page);
- void BindInterface(
- mojo::PendingReceiver<mojom::sample_swa::PageHandler> pending_receiver,
- mojo::PendingRemote<mojom::sample_swa::Page> pending_page);
- private:
- // Shows how the page can retrieve information from the browser process.
- void GetPreferences(GetPreferencesCallback callback) override;
- // Shows how the page can send information to the browser process.
- void Send(const std::string& message) override;
- // Handles the page requesting an action from the controller.
- void DoSomething() override;
- // Called as a reaction to DoSomething; invoked when DoSomething is done.
- void OnSomethingDone();
- // Called after `page_` is bound. This requests `page_` to bind child page's
- // Mojo pipes in JavaScript.
- void BindChildPageInJavaScript(
- mojo::PendingRemote<mojom::sample_swa::ChildUntrustedPage>
- child_trusted_page,
- mojo::PendingReceiver<mojom::sample_swa::ParentTrustedPage>
- parent_trusted_page);
- mojo::Receiver<mojom::sample_swa::PageHandler> receiver_{this};
- mojo::Remote<mojom::sample_swa::Page> page_;
- std::string message_;
- // The event signaling page handler is bound. This is the earliest time `this`
- // can send Mojo messages to JavaScript.
- base::OneShotEvent on_page_handler_bound_;
- base::WeakPtrFactory<PageHandler> weak_ptr_factory_{this};
- };
- } // namespace ash
- #endif // ASH_WEBUI_SAMPLE_SYSTEM_WEB_APP_UI_SAMPLE_PAGE_HANDLER_H_
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