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      1 // Copyright (c) 2011 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 UI_BASE_COCOA_HOVER_BUTTON_
      6 #define UI_BASE_COCOA_HOVER_BUTTON_
      7 
      8 #import <Cocoa/Cocoa.h>
      9 
     10 #import "ui/base/cocoa/tracking_area.h"
     11 #import "ui/base/ui_base_export.h"
     12 
     13 // A button that changes when you hover over it and click it.
     14 UI_BASE_EXPORT
     15 @interface HoverButton : NSButton {
     16  @protected
     17   // Enumeration of the hover states that the close button can be in at any one
     18   // time. The button cannot be in more than one hover state at a time.
     19   enum HoverState {
     20     kHoverStateNone = 0,
     21     kHoverStateMouseOver = 1,
     22     kHoverStateMouseDown = 2
     23   };
     24 
     25   HoverState hoverState_;
     26 
     27  @private
     28   // Tracking area for button mouseover states. Nil if not enabled.
     29   ui::ScopedCrTrackingArea trackingArea_;
     30 }
     31 
     32 @property(nonatomic) HoverState hoverState;
     33 
     34 // Enables or disables the tracking for the button.
     35 - (void)setTrackingEnabled:(BOOL)enabled;
     36 
     37 // Checks to see whether the mouse is in the button's bounds and update
     38 // the image in case it gets out of sync.  This occurs to the close button
     39 // when you close a tab so the tab to the left of it takes its place, and
     40 // drag the button without moving the mouse before you press the button down.
     41 - (void)checkImageState;
     42 
     43 @end
     44 
     45 #endif  // UI_BASE_COCOA_HOVER_BUTTON_
     46