[ios] Adds LocationBarCoordinator.

ios/clean/chrome/browser/ui/omnibox/location_bar_mediator.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/clean/chrome/browser/ui/omnibox/location_bar_mediator.h"
+
+#include "base/memory/ptr_util.h"
+#include "base/strings/utf_string_conversions.h"
+#include "ios/chrome/browser/ui/toolbar/toolbar_model_delegate_ios.h"
+#include "ios/chrome/browser/ui/toolbar/toolbar_model_impl_ios.h"
+#include "ios/shared/chrome/browser/tabs/web_state_list.h"
+#include "ios/shared/chrome/browser/tabs/web_state_list_observer_bridge.h"
+#import "ios/shared/chrome/browser/ui/omnibox/location_bar_controller.h"
+#import "ios/web/public/navigation_manager.h"
+#import "ios/web/public/web_state/web_state.h"
+#import "ios/web/public/web_state/web_state_observer_bridge.h"
+
+#if !defined(__has_feature) || !__has_feature(objc_arc)
+#error "This file requires ARC support."
+#endif
+
+@interface LocationBarMediator ()<CRWWebStateObserver,
+                                  LocationBarDelegate,
+                                  WebStateListObserving>
+@property(nonatomic, readwrite, assign) WebStateList* webStateList;
+@end
+
+@implementation LocationBarMediator {
+  // Observes the WebStateList so that this mediator can update the UI when the
+  // active WebState changes.
+  std::unique_ptr<WebStateListObserverBridge> _webStateListObserver;
+
+  // Used to update the UI in response to WebState observer notifications.  This
+  // observer is always observing the currently-active WebState and may be
+  // nullptr if no WebState is currently active.
+  std::unique_ptr<web::WebStateObserverBridge> _webStateObserver;
+
+  // The LocationBarController that wraps OmniboxViewIOS and
+  // OmniboxTextFieldIOS.  This mediator updates the UI through |_locationBar|
+  // rather than through a consumer.
+  std::unique_ptr<LocationBarController> _locationBar;
+
+  // The ToolbarModelDelegate, backed by |_webStateList|.
+  std::unique_ptr<ToolbarModelDelegateIOS> _toolbarModelDelegate;
+
+  // The ToolbarModel that backs |_locationBar|.
+  std::unique_ptr<ToolbarModelImplIOS> _toolbarModel;
+}
+
+@synthesize webStateList = _webStateList;
+
+- (instancetype)initWithWebStateList:(WebStateList*)webStateList {
+  if ((self = [super init])) {
+    _webStateList = webStateList;
+
+    _webStateListObserver = base::MakeUnique<WebStateListObserverBridge>(self);
+    _webStateList->AddObserver(_webStateListObserver.get());
+    web::WebState* webState = _webStateList->GetActiveWebState();
+    if (webState) {
+      _webStateObserver =
+          base::MakeUnique<web::WebStateObserverBridge>(webState, self);
+    }
+
+    _toolbarModelDelegate =
+        base::MakeUnique<ToolbarModelDelegateIOS>(webStateList);
+    _toolbarModel =
+        base::MakeUnique<ToolbarModelImplIOS>(_toolbarModelDelegate.get());
+  }
+  return self;
+}
+
+- (void)dealloc {
+  _webStateList->RemoveObserver(_webStateListObserver.get());
+}
+
+- (void)setLocationBar:(std::unique_ptr<LocationBarController>)locationBar {
+  _locationBar = std::move(locationBar);
+  _locationBar->OnToolbarUpdated();
+}
+
+#pragma mark - LocationBarDelegate
+
+- (void)loadGURLFromLocationBar:(const GURL&)url
+                     transition:(ui::PageTransition)transition {
+  web::WebState* webState = _webStateList->GetActiveWebState();
+  DCHECK(webState);
+
+  if (url.SchemeIs(url::kJavaScriptScheme)) {
+    // TODO(crbug.com/708341): Percent-unescape the url content first.
+    webState->ExecuteJavaScript(base::UTF8ToUTF16(url.GetContent()));
+    return;
+  } else {
+    // TODO(crbug.com/708341): Use WebState::OpenURL() here, because that method
+    // can handle different WindowOpenDispositions.  The code below assumes
+    // CURRENT_TAB.
+
+    // When opening a URL, force the omnibox to resign first responder.  This
+    // will also close the popup.
+    web::NavigationManager::WebLoadParams loadParams(url);
+    loadParams.transition_type = transition;
+    loadParams.is_renderer_initiated = false;
+    webState->GetNavigationManager()->LoadURLWithParams(loadParams);
+  }
+
+  _locationBar->HideKeyboardAndEndEditing();
+  _locationBar->OnToolbarUpdated();
+}
+
+- (void)locationBarHasBecomeFirstResponder {
+  // TODO(crbug.com/708341): Implement this method or edit this comment with an
+  // explanation of what this method needs to do.
+}
+
+- (void)locationBarHasResignedFirstResponder {
+  // TODO(crbug.com/708341): Implement this method or edit this comment with an
+  // explanation of what this method needs to do.
+}
+
+- (void)locationBarBeganEdit {
+  // TODO(crbug.com/708341): Implement this method or edit this comment with an
+  // explanation of what this method needs to do.
+}
+
+- (void)locationBarChanged {
+  // TODO(crbug.com/708341): Implement this method or edit this comment with an
+  // explanation of what this method needs to do.
+}
+
+- (web::WebState*)getWebState {
+  return _webStateList->GetActiveWebState();
+}
+
+- (ToolbarModel*)toolbarModel {
+  return _toolbarModel->GetToolbarModel();
+}
+
+#pragma mark - WebStateListObserver
+
+- (void)webStateList:(WebStateList*)webStateList
+    didChangeActiveWebState:(web::WebState*)newWebState
+                oldWebState:(web::WebState*)oldWebState
+                    atIndex:(int)atIndex
+                 userAction:(BOOL)userAction {
+  // If the omnibox is focused, force it to resign first responder when the
+  // active tab changes.
+  _locationBar->HideKeyboardAndEndEditing();
+
+  if (newWebState) {
+    _webStateObserver =
+        base::MakeUnique<web::WebStateObserverBridge>(newWebState, self);
+  } else {
+    _webStateObserver = nullptr;
+  }
+
+  _locationBar->OnToolbarUpdated();
+}
+
+#pragma mark - WebStateObserver
+
+// WebState navigation events that could potentially affect the contents of the
+// omnibox are caught below and used to drive updates to the UI.
+
+- (void)webState:(web::WebState*)webState
+    didStartProvisionalNavigationForURL:(const GURL&)URL {
+  _locationBar->OnToolbarUpdated();
+}
+
+- (void)webState:(web::WebState*)webState
+    didCommitNavigationWithDetails:
+        (const web::LoadCommittedDetails&)load_details {
+  _locationBar->OnToolbarUpdated();
+}
+
+- (void)webState:(web::WebState*)webState
+    didFinishNavigation:(web::NavigationContext*)navigation {
+  _locationBar->OnToolbarUpdated();
+}
+
+- (void)webState:(web::WebState*)webState didLoadPageWithSuccess:(BOOL)success {
+  _locationBar->OnToolbarUpdated();
+}
+
+- (void)webStateDidChangeVisibleSecurityState:(web::WebState*)webState {
+  _locationBar->OnToolbarUpdated();
+}
+
+- (void)webStateDestroyed:(web::WebState*)webState {
+  _webStateObserver = nullptr;
+}
+
+@end