[ios] TabCollectionItem

ios/clean/chrome/browser/ui/tab_collection/tab_collection_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/tab_collection/tab_collection_mediator.h"
 
 #include "base/memory/ptr_util.h"
 #include "base/scoped_observer.h"
 #include "base/strings/sys_string_conversions.h"
 #import "ios/chrome/browser/web_state_list/web_state_list.h"
 #import "ios/clean/chrome/browser/ui/tab_collection/tab_collection_consumer.h"
+#import "ios/clean/chrome/browser/ui/tab_collection/tab_collection_item.h"
 #include "ios/web/public/web_state/web_state.h"
 
 #if !defined(__has_feature) || !__has_feature(objc_arc)
 #error "This file requires ARC support."
 #endif
 
 @implementation TabCollectionMediator {
   std::unique_ptr<WebStateListObserverBridge> _webStateListObserver;
   std::unique_ptr<ScopedObserver<WebStateList, WebStateListObserverBridge>>
       _scopedWebStateListObserver;
@@ skipping 21 matching lines @@
 
 - (void)disconnect {
   self.webStateList = nullptr;
 }
 
 #pragma mark - Properties
 
 - (void)setWebStateList:(WebStateList*)webStateList {
   _scopedWebStateListObserver->RemoveAll();
   _webStateList = webStateList;
-  if (!_webStateList) {
-    return;
+  [self initializeConsumerItems];
+  if (_webStateList) {
+    _scopedWebStateListObserver->Add(_webStateList);
   }
-  _scopedWebStateListObserver->Add(_webStateList);
 }
 
-#pragma mark - TabCollectionDataSource
-
-- (int)numberOfTabs {
-  return self.webStateList->count();
-}
-
-- (NSString*)titleAtIndex:(int)index {
-  return [self titleFromWebState:self.webStateList->GetWebStateAt(index)];
-}
-
-- (int)indexOfActiveTab {
-  return self.webStateList->active_index();
+- (void)setConsumer:(id<TabCollectionConsumer>)consumer {
+  _consumer = consumer;
+  [self initializeConsumerItems];
 }
 
 #pragma mark - WebStateListObserving
 
 - (void)webStateList:(WebStateList*)webStateList
     didInsertWebState:(web::WebState*)webState
               atIndex:(int)index {
-  [self.consumer insertItemAtIndex:index];
+  [self.consumer insertItem:[self itemFromWebState:webState] atIndex:index];
 }
 
 - (void)webStateList:(WebStateList*)webStateList
      didMoveWebState:(web::WebState*)webState
            fromIndex:(int)fromIndex
              toIndex:(int)toIndex {
-  int minIndex = std::min(fromIndex, toIndex);
-  int length = std::abs(fromIndex - toIndex) + 1;
-  NSIndexSet* indexes =
-      [[NSIndexSet alloc] initWithIndexesInRange:NSMakeRange(minIndex, length)];
-  [self.consumer reloadItemsAtIndexes:indexes];
+  [self.consumer moveItemFromIndex:fromIndex toIndex:toIndex];
 }
 
 - (void)webStateList:(WebStateList*)webStateList
     didReplaceWebState:(web::WebState*)oldWebState
           withWebState:(web::WebState*)newWebState
                atIndex:(int)index {
-  [self.consumer reloadItemsAtIndexes:[NSIndexSet indexSetWithIndex:index]];
+  [self.consumer replaceItemAtIndex:index
+                           withItem:[self itemFromWebState:newWebState]];
 }
 
 - (void)webStateList:(WebStateList*)webStateList
     didDetachWebState:(web::WebState*)webState
               atIndex:(int)index {
   [self.consumer deleteItemAtIndex:index];
 }
 
 - (void)webStateList:(WebStateList*)webStateList
     didChangeActiveWebState:(web::WebState*)newWebState
                 oldWebState:(web::WebState*)oldWebState
                     atIndex:(int)atIndex
                  userAction:(BOOL)userAction {
-  int fromIndex = webStateList->GetIndexOfWebState(oldWebState);
-  NSMutableIndexSet* indexes = [[NSMutableIndexSet alloc] init];
-  if (fromIndex >= 0 && fromIndex < [self numberOfTabs]) {
-    [indexes addIndex:fromIndex];
-  }
-  if (atIndex >= 0 && atIndex < [self numberOfTabs]) {
-    [indexes addIndex:atIndex];
-  }
-  [self.consumer reloadItemsAtIndexes:indexes];
+  [self.consumer selectItemAtIndex:atIndex];
 }
 
 #pragma mark - Private
 
-- (NSString*)titleFromWebState:(const web::WebState*)webState {
+- (TabCollectionItem*)itemFromWebState:(const web::WebState*)webState {

[sczs, 2017/05/18 16:11:02]

nit: WDYT about changing this to tabCollectionItemFromWebState, it could add
some clarity.

[edchin, 2017/05/18 17:30:26]

Done.

   // PLACEHOLDER: Use real webstate title in the future.
   GURL url = webState->GetVisibleURL();
   NSString* urlText = @"<New Tab>";
   if (url.is_valid()) {
     urlText = base::SysUTF8ToNSString(url.spec());
   }
-  return urlText;
+  TabCollectionItem* item = [[TabCollectionItem alloc] init];
+  item.title = urlText;
+  return item;
+}
+
+- (NSArray<TabCollectionItem*>*)itemsFromWebStateList:
+    (const WebStateList*)webStateList {
+  DCHECK(webStateList);
+  NSMutableArray<TabCollectionItem*>* items = [[NSMutableArray alloc] init];
+  for (int i = 0; i < webStateList->count(); i++) {
+    [items addObject:[self itemFromWebState:webStateList->GetWebStateAt(i)]];
+  }
+  return [items copy];
+}
+
+- (void)initializeConsumerItems {
+  if (self.consumer && self.webStateList) {
+    [self.consumer
+        initializeItems:[self itemsFromWebStateList:self.webStateList]];
+    [self.consumer selectItemAtIndex:self.webStateList->active_index()];
+  }
 }
 
 @end