[Navigation Experiment] Add WKBasedNavigationManagerImpl.

ios/web/navigation/wk_based_navigation_manager_impl.mm

+// 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.
+
+#import "ios/web/navigation/wk_based_navigation_manager_impl.h"
+
+#include <memory>
+
+#include "base/logging.h"
+#include "base/memory/ptr_util.h"
+#import "ios/web/navigation/navigation_item_impl.h"
+#import "ios/web/navigation/navigation_manager_delegate.h"
+#include "ios/web/public/load_committed_details.h"
+#import "ios/web/public/navigation_item.h"
+#import "ios/web/public/web_client.h"
+#import "ios/web/web_state/ui/web_view_navigation_proxy.h"
+#import "net/base/mac/url_conversions.h"
+
+#if !defined(__has_feature) || !__has_feature(objc_arc)
+#error "This file requires ARC support."
+#endif
+
+@class CRWSessionController;
+
+namespace {
+
+web::WebViewNavigationProxy* GetWebViewOrDie(

[Eugene But (OOO till 7-30), 2017/06/29 01:48:19]

Generally it is uncommon in chromium code to DHECK/CHECK before pointer
dereferencing, so how about just inlining
|delegate->GetWebViewNavigationProxy()| call?

[danyao, 2017/06/29 16:05:25]

Done.

+    web::NavigationManagerDelegate* delegate) {
+  DCHECK(delegate);
+  web::WebViewNavigationProxy* proxy = delegate->GetWebViewNavigationProxy();
+  DCHECK(proxy);
+  return proxy;
+}
+
+}  // namespace
+
+namespace web {
+
+WKBasedNavigationManagerImpl::WKBasedNavigationManagerImpl()
+    : delegate_(nullptr), browser_state_(nullptr) {}
+
+WKBasedNavigationManagerImpl::~WKBasedNavigationManagerImpl() {}

[Eugene But (OOO till 7-30), 2017/06/29 01:48:19]

nit: WKBasedNavigationManagerImpl::~WKBasedNavigationManagerImpl() = default;

[danyao, 2017/06/29 16:05:26]

Done.

+
+void WKBasedNavigationManagerImpl::SetDelegate(
+    NavigationManagerDelegate* delegate) {
+  delegate_ = delegate;
+}
+
+void WKBasedNavigationManagerImpl::SetBrowserState(
+    BrowserState* browser_state) {
+  browser_state_ = browser_state;
+}
+
+void WKBasedNavigationManagerImpl::SetSessionController(
+    CRWSessionController* session_controller) {}
+
+void WKBasedNavigationManagerImpl::InitializeSession() {}
+
+void WKBasedNavigationManagerImpl::ReplaceSessionHistory(
+    std::vector<std::unique_ptr<NavigationItem>> items,
+    int current_index) {
+  DLOG(WARNING) << "Not yet implemented.";
+}
+
+void WKBasedNavigationManagerImpl::OnNavigationItemsPruned(
+    size_t pruned_item_count) {
+  delegate_->OnNavigationItemsPruned(pruned_item_count);
+}
+
+void WKBasedNavigationManagerImpl::OnNavigationItemChanged() {
+  delegate_->OnNavigationItemChanged();
+}
+
+void WKBasedNavigationManagerImpl::OnNavigationItemCommitted() {
+  LoadCommittedDetails details;
+  details.item = GetLastCommittedItem();
+  DCHECK(details.item);
+  details.previous_item_index = GetPreviousItemIndex();
+  if (details.previous_item_index >= 0) {
+    NavigationItem* previous_item = GetItemAtIndex(details.previous_item_index);
+    DCHECK(previous_item);
+    details.previous_url = previous_item->GetURL();
+    details.is_in_page =
+        AreURLsInPageNavigation(details.previous_url, details.item->GetURL());
+  } else {
+    details.previous_url = GURL();
+    details.is_in_page = NO;
+  }
+
+  delegate_->OnNavigationItemCommitted(details);
+}
+
+CRWSessionController* WKBasedNavigationManagerImpl::GetSessionController()
+    const {
+  return nullptr;
+}
+
+void WKBasedNavigationManagerImpl::AddTransientItem(const GURL& url) {
+  DLOG(WARNING) << "Not yet implemented.";
+}
+
+void WKBasedNavigationManagerImpl::AddPendingItem(
+    const GURL& url,
+    const web::Referrer& referrer,
+    ui::PageTransition navigation_type,
+    NavigationInitiationType initiation_type,
+    UserAgentOverrideOption user_agent_override_option) {
+  DLOG(WARNING) << "Not yet implemented.";
+}
+
+void WKBasedNavigationManagerImpl::CommitPendingItem() {
+  DLOG(WARNING) << "Not yet implemented.";
+}
+
+int WKBasedNavigationManagerImpl::GetIndexForOffset(int offset) const {
+  DLOG(WARNING) << "Not yet implemented.";
+  return -1;
+}
+
+BrowserState* WKBasedNavigationManagerImpl::GetBrowserState() const {
+  return browser_state_;
+}
+
+WebState* WKBasedNavigationManagerImpl::GetWebState() const {
+  return delegate_->GetWebState();
+}
+
+NavigationItem* WKBasedNavigationManagerImpl::GetVisibleItem() const {
+  DLOG(WARNING) << "Not yet implemented.";
+  return nullptr;
+}
+
+NavigationItem* WKBasedNavigationManagerImpl::GetLastCommittedItem() const {
+  DLOG(WARNING) << "Not yet implemented.";
+  return nullptr;
+}
+
+NavigationItem* WKBasedNavigationManagerImpl::GetPendingItem() const {
+  DLOG(WARNING) << "Not yet implemented.";
+  return nullptr;
+}
+
+NavigationItem* WKBasedNavigationManagerImpl::GetTransientItem() const {
+  DLOG(WARNING) << "Not yet implemented.";
+  return nullptr;
+}
+
+void WKBasedNavigationManagerImpl::DiscardNonCommittedItems() {
+  DLOG(WARNING) << "Not yet implemented.";
+}
+
+void WKBasedNavigationManagerImpl::LoadURLWithParams(
+    const NavigationManager::WebLoadParams&) {
+  DLOG(WARNING) << "Not yet implemented.";
+}
+
+void WKBasedNavigationManagerImpl::AddTransientURLRewriter(
+    BrowserURLRewriter::URLRewriter rewriter) {
+  DCHECK(rewriter);
+  if (!transient_url_rewriters_) {
+    transient_url_rewriters_.reset(
+        new std::vector<BrowserURLRewriter::URLRewriter>());
+  }
+  transient_url_rewriters_->push_back(rewriter);
+}
+
+int WKBasedNavigationManagerImpl::GetItemCount() const {
+  WebViewNavigationProxy* proxy = delegate_->GetWebViewNavigationProxy();
+  if (proxy) {
+    NSUInteger count_current_page = proxy->GetCurrentItem() ? 1 : 0;
+    return (int)(proxy->GetBackList().count + count_current_page +

[Eugene But (OOO till 7-30), 2017/06/29 01:48:19]

Please use C++ casting:

https://google.github.io/styleguide/cppguide.html#Casting

[danyao, 2017/06/29 16:05:26]

Done.

+                 proxy->GetForwardList().count);
+  }
+
+  // If WebView has not been created, it's fair to say navigation has 0 item.
+  return 0;
+}
+
+NavigationItem* WKBasedNavigationManagerImpl::GetItemAtIndex(
+    size_t index) const {
+  DLOG(WARNING) << "Not yet implemented.";
+  return nullptr;
+}
+
+int WKBasedNavigationManagerImpl::GetIndexOfItem(
+    const NavigationItem* item) const {
+  DLOG(WARNING) << "Not yet implemented.";
+  return -1;
+}
+
+int WKBasedNavigationManagerImpl::GetPendingItemIndex() const {
+  DLOG(WARNING) << "Not yet implemented.";
+  return -1;
+}
+
+int WKBasedNavigationManagerImpl::GetLastCommittedItemIndex() const {
+  WebViewNavigationProxy* proxy = delegate_->GetWebViewNavigationProxy();
+  if (proxy && proxy->GetCurrentItem()) {
+    return static_cast<int>(proxy->GetBackList().count);
+  }
+  return -1;
+}
+
+bool WKBasedNavigationManagerImpl::RemoveItemAtIndex(int index) {
+  DLOG(WARNING) << "Not yet implemented.";
+  return true;
+}
+
+bool WKBasedNavigationManagerImpl::CanGoBack() const {
+  WebViewNavigationProxy* proxy = delegate_->GetWebViewNavigationProxy();
+  return proxy && proxy->CanGoBack();
+}
+
+bool WKBasedNavigationManagerImpl::CanGoForward() const {
+  WebViewNavigationProxy* proxy = delegate_->GetWebViewNavigationProxy();
+  return proxy && proxy->CanGoForward();
+}
+
+bool WKBasedNavigationManagerImpl::CanGoToOffset(int offset) const {
+  int index = GetIndexForOffset(offset);
+  return index >= 0 && index < GetItemCount();
+}
+
+void WKBasedNavigationManagerImpl::GoBack() {
+  GetWebViewOrDie(delegate_)->GoBack();
+}
+
+void WKBasedNavigationManagerImpl::GoForward() {
+  GetWebViewOrDie(delegate_)->GoForward();
+}
+
+void WKBasedNavigationManagerImpl::GoToIndex(int index) {
+  DLOG(WARNING) << "Not yet implemented.";
+}
+
+void WKBasedNavigationManagerImpl::Reload(ReloadType reload_type,
+                                          bool check_for_reposts) {
+  DLOG(WARNING) << "Not yet implemented.";
+}
+
+NavigationItemList WKBasedNavigationManagerImpl::GetBackwardItems() const {
+  DLOG(WARNING) << "Not yet implemented.";
+  return NavigationItemList();
+}
+
+NavigationItemList WKBasedNavigationManagerImpl::GetForwardItems() const {
+  DLOG(WARNING) << "Not yet implemented.";
+  return NavigationItemList();
+}
+
+void WKBasedNavigationManagerImpl::CopyStateFromAndPrune(
+    const NavigationManager* source) {
+  DLOG(WARNING) << "Not yet implemented.";
+}
+
+bool WKBasedNavigationManagerImpl::CanPruneAllButLastCommittedItem() const {
+  DLOG(WARNING) << "Not yet implemented.";
+  return true;
+}
+
+void WKBasedNavigationManagerImpl::RemoveTransientURLRewriters() {
+  transient_url_rewriters_.reset();
+}
+
+std::unique_ptr<std::vector<BrowserURLRewriter::URLRewriter>>
+WKBasedNavigationManagerImpl::GetTransientURLRewriters() {
+  return std::move(transient_url_rewriters_);
+};
+
+NavigationItemImpl* WKBasedNavigationManagerImpl::GetNavigationItemImplAtIndex(
+    size_t index) const {
+  DLOG(WARNING) << "Not yet implemented.";
+  return nullptr;
+}
+
+int WKBasedNavigationManagerImpl::GetPreviousItemIndex() const {
+  return std::max(-1, GetIndexForOffset(-1));

[Eugene But (OOO till 7-30), 2017/06/29 01:48:19]

"previous" in this context means "the old" not "current - 1". So you probably
want to use |DLOG(WARNING) << "Not yet implemented.";| here.

[danyao, 2017/06/29 16:05:26]

Done.

+}
+
+}  // namespace web