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// Copyright 2015 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 "components/web_view/navigation_controller.h"
#include "components/web_view/frame.h"
#include "components/web_view/navigation_controller_delegate.h"
#include "components/web_view/navigation_entry.h"
#include "components/web_view/reload_type.h"
namespace web_view {
NavigationController::NavigationController(
NavigationControllerDelegate* delegate)
: pending_entry_(nullptr),
last_committed_entry_index_(-1),
pending_entry_index_(-1),
delegate_(delegate) {}
NavigationController::~NavigationController() {
DiscardPendingEntry(false);
}
int NavigationController::GetCurrentEntryIndex() const {
if (pending_entry_index_ != -1)
return pending_entry_index_;
return last_committed_entry_index_;
}
int NavigationController::GetIndexForOffset(int offset) const {
return GetCurrentEntryIndex() + offset;
}
int NavigationController::GetEntryCount() const {
// TODO(erg): Have a max number of entries, and DCHECK that we are smaller
// than it here.
return static_cast<int>(entries_.size());
}
NavigationEntry* NavigationController::GetEntryAtIndex(int index) const {
if (index < 0 || index >= GetEntryCount())
return nullptr;
return entries_[index];
}
NavigationEntry* NavigationController::GetEntryAtOffset(int offset) const {
return GetEntryAtIndex(GetIndexForOffset(offset));
}
bool NavigationController::CanGoBack() const {
return CanGoToOffset(-1);
}
bool NavigationController::CanGoForward() const {
return CanGoToOffset(1);
}
bool NavigationController::CanGoToOffset(int offset) const {
int index = GetIndexForOffset(offset);
return index >= 0 && index < GetEntryCount();
}
void NavigationController::GoBack() {
if (!CanGoBack()) {
NOTREACHED();
return;
}
// Base the navigation on where we are now...
int current_index = GetCurrentEntryIndex();
DiscardPendingEntry(false);
pending_entry_index_ = current_index - 1;
// TODO(erg): Transition type handled here.
NavigateToPendingEntry(ReloadType::NO_RELOAD, true);
}
void NavigationController::GoForward() {
if (!CanGoForward()) {
NOTREACHED();
return;
}
// TODO(erg): The upstream version handles transience here.
// Base the navigation on where we are now...
int current_index = GetCurrentEntryIndex();
DiscardPendingEntry(false);
pending_entry_index_ = current_index + 1;
// TODO(erg): Transition type handled here.
NavigateToPendingEntry(ReloadType::NO_RELOAD, true);
}
void NavigationController::LoadURL(mojo::URLRequestPtr request) {
// TODO(erg): This mimics part of NavigationControllerImpl::LoadURL(), minus
// all the error checking.
SetPendingEntry(make_scoped_ptr(new NavigationEntry(request.Pass())));
NavigateToPendingEntry(ReloadType::NO_RELOAD, false);
}
void NavigationController::NavigateToPendingEntry(
ReloadType reload_type,
bool update_navigation_start_time) {
// TODO(erg): Deal with session history navigations while trying to navigate
// to a slow-to-commit page.
// TODO(erg): Deal with interstitials.
// For session history navigations only the pending_entry_index_ is set.
if (!pending_entry_) {
CHECK_NE(pending_entry_index_, -1);
pending_entry_ = entries_[pending_entry_index_];
}
// TODO(erg): Eventually, we need to deal with restoring the state of the
// full tree. For now, we'll just shell back to the WebView.
delegate_->OnNavigate(
pending_entry_->BuildURLRequest(update_navigation_start_time));
}
void NavigationController::DiscardPendingEntry(bool was_failure) {
// TODO(erg): We might copy the CHECK regarding NavigateToEntry here.
// TODO(erg): We need to maintain the failed_pending_entry_ during
// |was_failure| here.
if (pending_entry_index_ == -1)
delete pending_entry_;
pending_entry_ = nullptr;
pending_entry_index_ = -1;
}
void NavigationController::SetPendingEntry(scoped_ptr<NavigationEntry> entry) {
// TODO(erg): Should be DiscardNonCommittedEntries() if we start porting
// transient states over.
DiscardPendingEntry(false);
pending_entry_ = entry.release();
DCHECK_EQ(-1, pending_entry_index_);
// TODO(erg): The content code sends NOTIFICATION_NAV_ENTRY_PENDING here.
}
void NavigationController::FrameDidCommitProvisionalLoad(Frame* frame) {
// Our renderer is committing a frame. If this was a real implementation,
// we'd do something!
if (frame->parent())
return;
// TODO(erg): Need some equivalent of InsertOrReplaceEntry(), as we need to
// prune the history list.
// TODO(erg): We should copy all the logic from the various
// RendererDidNavigate* methods here.
// TODO(erg): Medium term, we shouldn't be reusing the NavigationEntry, as it
// appears that blink can change some of the data during the navigation. Do
// it for now for bootstrapping purposes.
if (pending_entry_index_ == -1 && pending_entry_) {
ClearForwardEntries();
entries_.push_back(pending_entry_);
last_committed_entry_index_ = static_cast<int>(entries_.size() - 1);
pending_entry_ = nullptr;
} else if (pending_entry_index_ != -1 && pending_entry_) {
last_committed_entry_index_ = pending_entry_index_;
pending_entry_ = nullptr;
// This was a historical navigation. In this limited prototype, we don't
// actually do anything with it.
} else {
LOG(ERROR)
<< "Hit an unknown case in NavigationController::RendererDidNavigate";
}
DiscardPendingEntry(false);
delegate_->OnDidNavigate();
}
void NavigationController::FrameDidNavigateLocally(Frame* frame,
const GURL& url) {
// If this is a local navigation of a non-top frame, don't try to commit
// it.
if (frame->parent())
return;
ClearForwardEntries();
// TODO(erg): This is overly cheap handling of local navigations in
// frames. We don't have all the information needed to construct a real
// URLRequest.
entries_.push_back(new NavigationEntry(url));
last_committed_entry_index_ = static_cast<int>(entries_.size() - 1);
delegate_->OnDidNavigate();
}
void NavigationController::ClearForwardEntries() {
int current_size = static_cast<int>(entries_.size());
if (current_size > 0) {
while (last_committed_entry_index_ < (current_size - 1)) {
entries_.pop_back();
current_size--;
}
}
}
} // namespace web_view
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