[ios] Moves find-in-page code out of Tab and into FindTabHelper.

ios/chrome/browser/ui/browser_view_controller.mm

 // Copyright 2012 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/chrome/browser/ui/browser_view_controller.h"
 
 #import <AssetsLibrary/AssetsLibrary.h>
 #import <MobileCoreServices/MobileCoreServices.h>
 #import <PassKit/PassKit.h>
 #import <Photos/Photos.h>
@@ skipping 40 matching lines @@
 #include "ios/chrome/browser/bookmarks/bookmark_model_factory.h"
 #include "ios/chrome/browser/browser_state/chrome_browser_state.h"
 #include "ios/chrome/browser/chrome_url_constants.h"
 #include "ios/chrome/browser/chrome_url_util.h"
 #import "ios/chrome/browser/content_suggestions/content_suggestions_coordinator.h"
 #include "ios/chrome/browser/experimental_flags.h"
 #import "ios/chrome/browser/favicon/favicon_loader.h"
 #include "ios/chrome/browser/favicon/ios_chrome_favicon_loader_factory.h"
 #import "ios/chrome/browser/find_in_page/find_in_page_controller.h"
 #import "ios/chrome/browser/find_in_page/find_in_page_model.h"
+#import "ios/chrome/browser/find_in_page/find_tab_helper.h"
 #include "ios/chrome/browser/first_run/first_run.h"
 #import "ios/chrome/browser/geolocation/omnibox_geolocation_controller.h"
 #include "ios/chrome/browser/infobars/infobar_container_ios.h"
 #include "ios/chrome/browser/infobars/infobar_container_view.h"
 #import "ios/chrome/browser/metrics/new_tab_page_uma.h"
 #include "ios/chrome/browser/metrics/tab_usage_recorder.h"
 #import "ios/chrome/browser/native_app_launcher/native_app_navigation_controller.h"
 #import "ios/chrome/browser/open_url_util.h"
 #import "ios/chrome/browser/passwords/password_controller.h"
 #import "ios/chrome/browser/payments/payment_request_manager.h"
@@ skipping 213 matching lines @@
     return true;
   std::string url_host = url.host();
   return url_host != kChromeUIHistoryHost &&
          url_host != kChromeUIHistoryFrameHost;
 }
 
 // Temporary key to use when storing native controllers vended to tabs before
 // they are added to the tab model.
 NSString* const kNativeControllerTemporaryKey = @"NativeControllerTemporaryKey";
 
+// Helper function to return the FindInPageController for the given |tab|.  If
+// |tab| is nullptr or has no FindTabHelper, returns nil.
+FindInPageController* GetFindInPageController(Tab* tab) {
+  if (!tab) {
+    return nil;
+  }
+  FindTabHelper* helper = FindTabHelper::FromWebState(tab.webState);
+  if (!helper) {
+    return nil;
+  }
+  return helper->GetController();
+}
+
 }  // anonymous namespace
 
 @interface BrowserViewController ()<AppRatingPromptDelegate,
                                     ContextualSearchControllerDelegate,
                                     ContextualSearchPanelMotionObserver,
                                     CRWNativeContentProvider,
                                     CRWWebStateDelegate,
                                     DialogPresenterDelegate,
                                     FullScreenControllerDelegate,
                                     KeyCommandsPlumbing,
@@ skipping 755 matching lines @@
   Tab* tab = [_model currentTab];
   // TODO(shreyasv): Make it so the URL returned by the tab is always valid and
   // remove check on net::NSURLWithGURL(tab.url) ( http://crbug.com/400999 ).
   return tab && !tab.url.SchemeIs(kChromeUIScheme) &&
          net::NSURLWithGURL(tab.url);
 }
 
 - (BOOL)canShowFindBar {
   // Make sure web controller can handle find in page.
   Tab* tab = [_model currentTab];
-  if (![tab.findInPageController canFindInPage])
+  FindInPageController* controller = GetFindInPageController(tab);
+  if (![controller canFindInPage])
     return NO;
 
   // Don't show twice.
-  if (tab.findInPageController.findInPageModel.enabled)
+  if (controller.findInPageModel.enabled)
     return NO;
 
   return YES;
 }
 
 - (void)setVisible:(BOOL)visible {
   if (_visible == visible)
     return;
   _visible = visible;
 }
@@ skipping 339 matching lines @@
                     selector:@selector(tabWasAdded:)
                         name:kTabModelNewTabWillOpenNotification
                       object:_model];
 }
 
 - (void)pageLoadStarting:(NSNotification*)notify {
   Tab* tab = notify.userInfo[kTabModelTabKey];
   DCHECK(tab && ([_model indexOfTab:tab] != NSNotFound));
   // Hide find bar when navigating to a new page.
   [self hideFindBarWithAnimation:NO];
-  tab.findInPageController.findInPageModel.enabled = NO;
+
+  FindInPageController* controller = GetFindInPageController(tab);
+  controller.findInPageModel.enabled = NO;
+
   if (tab == [_model currentTab]) {
     // TODO(pinkerton): Fill in here about hiding the forward button on
     // navigation.
   }
 }
 
 - (void)pageLoadStarted:(NSNotification*)notify {
   Tab* tab = notify.userInfo[kTabModelTabKey];
   DCHECK(tab);
   if (tab == [_model currentTab]) {
@@ skipping 433 matching lines @@
 
   if (tab.isPrerenderTab && !_toolbarModelIOS->IsLoading())
     [_toolbarController showPrerenderingAnimation];
 
   // Also update the loading state for the tools menu (that is really an
   // extension of the toolbar on the iPhone).
   if (!IsIPadIdiom())
     [[_toolbarController toolsPopupController]
         setIsTabLoading:_toolbarModelIOS->IsLoading()];
 
-  if (tab.findInPageController.findInPageModel.enabled)
+  FindInPageController* controller = GetFindInPageController(tab);
+  if (controller.findInPageModel.enabled) {
     [self showFindBarWithAnimation:NO
                         selectText:YES
                        shouldFocus:[_findBarController isFocused]];
+  }
 
   // Hide the toolbar if displaying phone NTP.
   if (!IsIPadIdiom()) {
     CRWSessionEntry* entry =
         [[tab navigationManager]->GetSessionController() currentEntry];
     BOOL hideToolbar = NO;
     if (entry) {
       GURL url = [entry navigationItem]->GetURL();
       BOOL isNTP = url.GetOrigin() == GURL(kChromeUINewTabURL);
       hideToolbar = isNTP && !_isOffTheRecord &&
@@ skipping 1910 matching lines @@
             currentlyBookmarked:_toolbarModelIOS->IsCurrentTabBookmarkedByUser()
                          inView:[_toolbarController bookmarkButtonView]
                      originRect:[_toolbarController bookmarkButtonAnchorRect]];
       break;
     case IDC_CLOSE_TAB:
       [self closeCurrentTab];
       break;
     case IDC_FIND:
       [self initFindBarForTab];
       break;
-    case IDC_FIND_NEXT:
+    case IDC_FIND_NEXT: {
+      FindInPageController* findInPageController =
+          GetFindInPageController([_model currentTab]);
       // TODO(crbug.com/603524): Reshow find bar if necessary.
-      [[_model currentTab].findInPageController
-          findNextStringInPageWithCompletionHandler:^{
-            FindInPageModel* model =
-                [_model currentTab].findInPageController.findInPageModel;
-            [_findBarController updateResultsCount:model];
-          }];
+      [findInPageController findNextStringInPageWithCompletionHandler:^{
+        FindInPageModel* model = findInPageController.findInPageModel;
+        [_findBarController updateResultsCount:model];
+      }];
       break;
-    case IDC_FIND_PREVIOUS:
+    }
+    case IDC_FIND_PREVIOUS: {
+      FindInPageController* findInPageController =
+          GetFindInPageController([_model currentTab]);
       // TODO(crbug.com/603524): Reshow find bar if necessary.
-      [[_model currentTab].findInPageController
-          findPreviousStringInPageWithCompletionHandler:^{
-            FindInPageModel* model =
-                [_model currentTab].findInPageController.findInPageModel;
-            [_findBarController updateResultsCount:model];
-          }];
+      [findInPageController findPreviousStringInPageWithCompletionHandler:^{
+        FindInPageModel* model = findInPageController.findInPageModel;
+        [_findBarController updateResultsCount:model];
+      }];
       break;
+    }
     case IDC_FIND_CLOSE:
       [self closeFindInPage];
       break;
     case IDC_FIND_UPDATE:
       [self searchFindInPage];
       break;
     case IDC_FORWARD:
       [[_model currentTab] goForward];
       break;
     case IDC_FULLSCREEN:
@@ skipping 182 matching lines @@
 
 - (void)clearPresentedStateWithCompletion:(ProceduralBlock)completion {
   [[_dependencyFactory shareControllerInstance] cancelShareAnimated:NO];
   [_bookmarkInteractionController dismissBookmarkModalControllerAnimated:NO];
   [_bookmarkInteractionController dismissSnackbar];
   [_toolbarController cancelOmniboxEdit];
   [_dialogPresenter cancelAllDialogs];
   [self hidePageInfoPopupForView:nil];
   if (_voiceSearchController)
     _voiceSearchController->DismissMicPermissionsHelp();
-  [[_model currentTab] dismissModals];
-  [[_model currentTab].findInPageController
-      disableFindInPageWithCompletionHandler:^{
-        [self updateFindBar:NO shouldFocus:NO];
-      }];
+
+  Tab* currentTab = [_model currentTab];
+  [currentTab dismissModals];
+
+  FindInPageController* findInPageController =
+      GetFindInPageController(currentTab);
+  [findInPageController disableFindInPageWithCompletionHandler:^{
+    [self updateFindBar:NO shouldFocus:NO];
+  }];
+
   [_contextualSearchController movePanelOffscreen];
-
   [_paymentRequestManager cancelRequest];
-
   [_printController dismissAnimated:YES];
   _printController.reset();
   [_toolbarController dismissToolsMenuPopup];
   [_contextMenuCoordinator stop];
   [self dismissRateThisAppDialog];
 
   [_contentSuggestionsCoordinator stop];
 
   if (self.presentedViewController) {
     // Dismisses any other modal controllers that may be present, e.g. Recent
@@ skipping 76 matching lines @@
 // Create find bar controller and pass it to the web controller.
 - (void)initFindBarForTab {
   if (!self.canShowFindBar)
     return;
 
   if (!_findBarController)
     _findBarController.reset(
         [[FindBarControllerIOS alloc] initWithIncognito:_isOffTheRecord]);
 
   Tab* tab = [_model currentTab];
-  DCHECK(!tab.findInPageController.findInPageModel.enabled);
-  tab.findInPageController.findInPageModel.enabled = YES;
+  FindInPageController* controller = GetFindInPageController(tab);
+  DCHECK(!controller.findInPageModel.enabled);
+  controller.findInPageModel.enabled = YES;
   [self showFindBarWithAnimation:YES selectText:YES shouldFocus:YES];
 }
 
 - (void)searchFindInPage {
   FindInPageController* findInPageController =
-      [[_model currentTab] findInPageController];
+      GetFindInPageController([_model currentTab]);
   base::WeakNSObject<BrowserViewController> weakSelf(self);
-  [findInPageController
-       findStringInPage:[_findBarController searchTerm]
-      completionHandler:^{
-        FindInPageModel* model =
-            [_model currentTab].findInPageController.findInPageModel;
-        [_findBarController updateResultsCount:model];
-      }];
+  [findInPageController findStringInPage:[_findBarController searchTerm]
+                       completionHandler:^{
+                         FindInPageModel* model =
+                             findInPageController.findInPageModel;
+                         [_findBarController updateResultsCount:model];
+                       }];
   if (!_isOffTheRecord)
     [findInPageController saveSearchTerm];
 }
 
 - (void)closeFindInPage {
   base::WeakNSObject<BrowserViewController> weakSelf(self);
-  [[_model currentTab].findInPageController
-      disableFindInPageWithCompletionHandler:^{
-        [weakSelf updateFindBar:NO shouldFocus:NO];
-      }];
+  FindInPageController* findInPageController =
+      GetFindInPageController([_model currentTab]);
+  [findInPageController disableFindInPageWithCompletionHandler:^{
+    [weakSelf updateFindBar:NO shouldFocus:NO];
+  }];
 }
 
 - (void)updateFindBar:(BOOL)initialUpdate shouldFocus:(BOOL)shouldFocus {
-  FindInPageModel* model =
-      [_model currentTab].findInPageController.findInPageModel;
+  FindInPageController* findInPageController =
+      GetFindInPageController([_model currentTab]);
+  FindInPageModel* model = findInPageController.findInPageModel;
   if (model.enabled) {
     if (initialUpdate && !_isOffTheRecord) {
-      [[_model currentTab].findInPageController restoreSearchTerm];
+      [findInPageController restoreSearchTerm];
     }
 
     [self setFramesForHeaders:[self headerViews]
                      atOffset:[self currentHeaderOffset]];
     [_findBarController updateView:model
                      initialUpdate:initialUpdate
                     focusTextfield:shouldFocus];
   } else {
     [self hideFindBarWithAnimation:YES];
   }
@@ skipping 780 matching lines @@
 
 - (UIView*)voiceSearchButton {
   return _voiceSearchButton;
 }
 
 - (id<LogoAnimationControllerOwner>)logoAnimationControllerOwner {
   return [self currentLogoAnimationControllerOwner];
 }
 
 @end