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      1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style license that can be
      3 // found in the LICENSE file.
      4 
      5 #ifndef CHROME_BROWSER_UI_COCOA_OVERLAY_PANEL_CONTROLLER_H_
      6 #define CHROME_BROWSER_UI_COCOA_OVERLAY_PANEL_CONTROLLER_H_
      7 
      8 #import <Cocoa/Cocoa.h>
      9 
     10 #include "base/mac/scoped_nsobject.h"
     11 
     12 @class HistoryOverlayView;
     13 
     14 enum HistoryOverlayMode {
     15   kHistoryOverlayModeBack,
     16   kHistoryOverlayModeForward
     17 };
     18 
     19 // The HistoryOverlayController manages a view that is inserted atop the web
     20 // contents to provide visual feedback when the user is performing history
     21 // navigation gestures.
     22 @interface HistoryOverlayController : NSViewController {
     23  @private
     24   HistoryOverlayMode mode_;
     25   // Strongly typed reference of self.view.
     26   base::scoped_nsobject<HistoryOverlayView> contentView_;
     27   // The view above which self.view is inserted as a subview.
     28   base::scoped_nsobject<NSView> parent_;
     29 }
     30 
     31 // Designated initializer.
     32 - (id)initForMode:(HistoryOverlayMode)mode;
     33 
     34 // Shows the shield above |view|.
     35 - (void)showPanelForView:(NSView*)view;
     36 
     37 // Updates the appearance of the overlay based on track gesture progress.
     38 - (void)setProgress:(CGFloat)gestureAmount;
     39 
     40 // Fades the shield out and removes it from the view hierarchy.
     41 - (void)dismiss;
     42 
     43 @end
     44 
     45 #endif  // CHROME_BROWSER_UI_COCOA_OVERLAY_PANEL_CONTROLLER_H_
     46