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ash / webui / sample_system_web_app_ui / sample_page_handler.cc [blame]
// Copyright 2021 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "ash/webui/sample_system_web_app_ui/sample_page_handler.h"
#include <utility>
#include "base/functional/bind.h"
#include "base/task/thread_pool.h"
namespace ash {
PageHandler::PageHandler() = default;
PageHandler::~PageHandler() = default;
void PageHandler::BindInterface(
mojo::PendingReceiver<mojom::sample_swa::PageHandler> pending_receiver,
mojo::PendingRemote<mojom::sample_swa::Page> pending_page) {
receiver_.Bind(std::move(pending_receiver));
page_.Bind(std::move(pending_page));
on_page_handler_bound_.Signal();
}
void PageHandler::GetPreferences(GetPreferencesCallback callback) {
// Returns hardcoded preferences. In a real application this would
// be done with the help of Preference APIs.
std::move(callback).Run(
mojom::sample_swa::Preferences::New(/*background=*/"#ffffff",
/*foreground=*/"#000000"));
}
void PageHandler::Send(const std::string& message) {
message_ = message;
VLOG(1) << "Message set: " << message;
// In real application we would do something with the received value.
}
void PageHandler::DoSomething() {
// Pretends to do some work. In reality it just posts a task that will,
// once completed, issue an event notification to the page. We use a weak
// ptr to the PageHandler object, as the thread pool's lifetime may
// be longer than that of PageHandler.
base::ThreadPool::PostTaskAndReply(
FROM_HERE, base::BindOnce([]() {
// Do some work here.
}),
base::BindOnce(&PageHandler::OnSomethingDone,
weak_ptr_factory_.GetWeakPtr()));
}
void PageHandler::OnSomethingDone() {
page_->OnEventOccurred("DoSomething is done");
}
void PageHandler::CreateParentPage(
mojo::PendingRemote<mojom::sample_swa::ChildUntrustedPage>
child_trusted_page,
mojo::PendingReceiver<mojom::sample_swa::ParentTrustedPage>
parent_trusted_page) {
on_page_handler_bound_.Post(
FROM_HERE,
base::BindOnce(&PageHandler::BindChildPageInJavaScript,
// Safe to base::Unretained(), `this` owns
// `on_page_handler_ready_`. The callback
// won't be invoked if `this` is destroyed.
base::Unretained(this), std::move(child_trusted_page),
std::move(parent_trusted_page)));
}
void PageHandler::BindChildPageInJavaScript(
mojo::PendingRemote<mojom::sample_swa::ChildUntrustedPage>
child_trusted_page,
mojo::PendingReceiver<mojom::sample_swa::ParentTrustedPage>
parent_trusted_page) {
page_->CreateParentPage(std::move(child_trusted_page),
std::move(parent_trusted_page));
}
} // namespace ash