implementation for new duplicate download UI

chrome/browser/android/download/chrome_duplicate_download_infobar_delegate.cc

+// Copyright 2016 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.
+
+#include "chrome/browser/android/download/chrome_duplicate_download_infobar_delegate.h"
+
+#include <memory>
+
+#include "base/android/path_utils.h"
+#include "base/memory/ptr_util.h"
+#include "base/strings/stringprintf.h"
+#include "chrome/browser/android/download/download_controller.h"
+#include "chrome/browser/download/download_path_reservation_tracker.h"
+#include "chrome/browser/infobars/infobar_service.h"
+#include "chrome/browser/ui/android/infobars/duplicate_download_infobar.h"
+#include "components/infobars/core/infobar.h"
+#include "content/public/browser/browser_thread.h"
+
+namespace {
+
+void CreateNewFileDone(
+    const DownloadTargetDeterminerDelegate::FileSelectedCallback& callback,
+    const base::FilePath& target_path, bool verified) {
+  DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
+  if (verified)
+    callback.Run(target_path);
+  else
+    callback.Run(base::FilePath());
+}
+
+}  // namespace
+
+namespace chrome {
+namespace android {
+
+ChromeDuplicateDownloadInfoBarDelegate::
+    ~ChromeDuplicateDownloadInfoBarDelegate() {
+  if (download_item_)
+    download_item_->RemoveObserver(this);
+}
+
+// static
+void ChromeDuplicateDownloadInfoBarDelegate::Create(
+    InfoBarService* infobar_service,
+    content::DownloadItem* download_item,
+    const base::FilePath& file_path,
+    const DownloadTargetDeterminerDelegate::FileSelectedCallback& callback) {
+  infobar_service->AddInfoBar(DuplicateDownloadInfoBar::CreateInfoBar(
+      base::WrapUnique(new ChromeDuplicateDownloadInfoBarDelegate(
+          download_item, file_path, callback))));
+}
+
+void ChromeDuplicateDownloadInfoBarDelegate::OnDownloadDestroyed(
+    content::DownloadItem* download_item) {
+  DCHECK_EQ(download_item, download_item_);
+  download_item_ = nullptr;
+}
+
+ChromeDuplicateDownloadInfoBarDelegate::ChromeDuplicateDownloadInfoBarDelegate(
+    content::DownloadItem* download_item,
+    const base::FilePath& file_path,
+    const DownloadTargetDeterminerDelegate::FileSelectedCallback&
+        file_selected_callback)
+    : download_item_(download_item),
+      file_path_(file_path),
+      file_selected_callback_(file_selected_callback) {
+  download_item_->AddObserver(this);
+}
+
+infobars::InfoBarDelegate::InfoBarIdentifier
+ChromeDuplicateDownloadInfoBarDelegate::GetIdentifier() const {
+  return CHROME_DUPLICATE_DOWNLOAD_INFOBAR_DELEGATE;
+}
+
+bool ChromeDuplicateDownloadInfoBarDelegate::Download() {
+  if (!download_item_)
+    return true;
+
+  base::FilePath download_dir;
+  if (!base::android::GetDownloadsDirectory(&download_dir))
+    return true;
+
+  DownloadPathReservationTracker::GetReservedPath(
+      download_item_,
+      file_path_,
+      download_dir,
+      true,
+      DownloadPathReservationTracker::UNIQUIFY,
+      base::Bind(&CreateNewFileDone, file_selected_callback_));
+  return true;
+}
+
+bool ChromeDuplicateDownloadInfoBarDelegate::Cancel() {
+  if (!download_item_)
+    return true;
+
+  file_selected_callback_.Run(base::FilePath());
+  // TODO(qinmin): rename this histogram enum.
+  DownloadController::RecordDownloadCancelReason(
+      DownloadController::CANCEL_REASON_OVERWRITE_INFOBAR_DISMISSED);
+  return true;
+}
+
+std::string ChromeDuplicateDownloadInfoBarDelegate::GetFilePath() const {
+  return file_path_.value();
+}
+
+void ChromeDuplicateDownloadInfoBarDelegate::InfoBarDismissed() {
+  Cancel();
+}
+
+}  // namespace android
+}  // namespace chrome