Upstream Chrome on iOS source code [9/11].

ios/chrome/browser/ui/tab_switcher/tab_switcher_transition_context.h

+// Copyright 2016 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.
+
+#ifndef IOS_CHROME_BROWSER_UI_TAB_SWITCHER_TAB_SWITCHER_TRANSITION_CONTEXT_H_
+#define IOS_CHROME_BROWSER_UI_TAB_SWITCHER_TAB_SWITCHER_TRANSITION_CONTEXT_H_
+
+#import <UIKit/UIKit.h>
+
+#import "ios/chrome/browser/ui/tab_switcher/tab_switcher_tab_strip_placeholder_view.h"
+
+@class TabModel;
+@class BrowserViewController;
+
+// Holds the informations about a browser view controller that will be used
+// to create the transition from the browser view controller to the tab switcher
+// and vice versa.
+@interface TabSwitcherTransitionContextContent : NSObject
+
+// Create a transition context content from a browser view controller.
++ (instancetype)tabSwitcherTransitionContextContentFromBVC:
+    (BrowserViewController*)bvc;
+
+// Returns an autoreleased placeholder representing the BVC's toolbar.
+- (TabSwitcherTabStripPlaceholderView*)generateTabStripPlaceholderView;
+
+// Holds a snapshot view of the browser view controller's toolbar.
+@property(nonatomic, retain) UIView* toolbarSnapshotView;
+
+// Index of the selected tab in the browser view controller when the transition
+// context content was created.
+@property(nonatomic, assign) NSInteger initialSelectedTabIndex;
+@end
+
+// A Tab switcher transition context holds the informations needed to compute
+// the transition from a browser view controller to the tab switcher view
+// controller.
+@interface TabSwitcherTransitionContext : NSObject
+
+// Create a tab switcher transition context from the current browser view
+// controller, the main view controller (regular) and the off the record view
+// controller (incognito).
++ (instancetype)
+tabSwitcherTransitionContextWithCurrent:(BrowserViewController*)currentBVC
+                                mainBVC:(BrowserViewController*)mainBVC
+                                 otrBVC:(BrowserViewController*)otrBVC;
+
+// The snapshot image of the currently selected tab of the current view
+// controller.
+@property(nonatomic, retain) UIImage* tabSnapshotImage;
+// The tab switcher transition context content for the incognito (or main)
+// browser view controller.
+@property(nonatomic, retain)
+    TabSwitcherTransitionContextContent* incognitoContent;
+// The tab switcher transition context content for the regular (or off the
+// record) browser view controller.
+@property(nonatomic, retain)
+    TabSwitcherTransitionContextContent* regularContent;
+// The tab model of the broswser view controller selected when the transition
+// context was created.
+@property(nonatomic, retain) TabModel* initialTabModel;
+
+@end
+
+#endif  // IOS_CHROME_BROWSER_UI_TAB_SWITCHER_TAB_SWITCHER_TRANSITION_CONTEXT_H_