Upstream Chrome on iOS source code [6/11].

ios/chrome/browser/ui/overscroll_actions/overscroll_actions_view.h

+// 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.
+
+#ifndef IOS_CHROME_BROWSER_UI_OVERSCROLL_ACTIONS_OVERSCROLL_ACTIONS_VIEW_H_
+#define IOS_CHROME_BROWSER_UI_OVERSCROLL_ACTIONS_OVERSCROLL_ACTIONS_VIEW_H_
+
+#import <UIKit/UIKit.h>
+
+namespace ios_internal {
+// Describes the current Index of an action in the OverScrollActionsView.
+enum class OverscrollAction {
+  NONE,       // No action
+  NEW_TAB,    // New tab action
+  REFRESH,    // Refresh action
+  CLOSE_TAB,  // Close tab action
+};
+
+// Describes the style of the overscroll action UI.
+enum class OverscrollStyle {
+  NTP_NON_INCOGNITO,           // UI to fit the NTP in non incognito.
+  NTP_INCOGNITO,               // UI to fit the NTP in incognito.
+  REGULAR_PAGE_NON_INCOGNITO,  // UI to fit regular pages in non incognito.
+  REGULAR_PAGE_INCOGNITO       // UI to fit regular pages in incognito.
+};
+
+}  // namespace ios_internal
+
+@class OverscrollActionsView;
+
+@protocol OverscrollActionsViewDelegate
+
+- (void)overscrollActionsViewDidTapTriggerAction:
+    (OverscrollActionsView*)overscrollActionsView;
+
+@end
+
+// This view displays the actions of the OverscrollActionsController.
+// How actions are displayed depends on the vertical and horizontal offsets.
+@interface OverscrollActionsView : UIView
+
+// The currently selected action.
+@property(nonatomic, assign, readonly)
+    ios_internal::OverscrollAction selectedAction;
+// The view displayed has the background of the overscroll actions view.
+@property(nonatomic, retain, readonly) UIView* backgroundView;
+// Whether cropping is set on the selection circle (true by default).
+@property(nonatomic, assign) BOOL selectionCroppingEnabled;
+
+@property(nonatomic, assign) id<OverscrollActionsViewDelegate> delegate;
+
+// Add a snapshot view on top of the background image view. The previous
+// snapshot view if any will be removed.
+- (void)addSnapshotView:(UIView*)view;
+
+// Called to indicate that a new pull gesture has started.
+- (void)pullStarted;
+
+// Vertical offset [0, yOffset].
+// This offset is set to the top inset of the scrollView managed by the
+// OverscrollActionsController.
+- (void)updateWithVerticalOffset:(CGFloat)offset;
+
+// Horizontal offset [-1,1].
+// This offset is set by the OverscrollActionsController and is used to display
+// the action selection circle.
+- (void)updateWithHorizontalOffset:(CGFloat)offset;
+
+// This starts an "ink response" like animation typically triggered when an
+// action has been selected.
+- (void)displayActionAnimation;
+
+// Sets the style of the overscroll action UI.
+- (void)setStyle:(ios_internal::OverscrollStyle)style;
+
+@end
+
+#endif  // IOS_CHROME_BROWSER_UI_OVERSCROLL_ACTIONS_OVERSCROLL_ACTIONS_VIEW_H_