blob: eb070a161c572f7ecc6f4c31cb789bb559e6e8b4 [file] [log] [blame]
// 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.
#import <Cocoa/Cocoa.h>
#import "base/mac/scoped_nsobject.h"
#include "ui/views/views_export.h"
// The delegate set to ViewsScrollbarBridge.
class ViewsScrollbarBridgeDelegate {
// Invoked by ViewsScrollbarBridge when the system informs the process that
// the preferred scroller style has changed
virtual void OnScrollerStyleChanged() = 0;
// A bridge to NSScroller managed by NativeCocoaScrollbar. Serves as a helper
// class to bridge NSScroller notifications and functions to CocoaScrollbar.
@interface ViewsScrollbarBridge : NSObject {
ViewsScrollbarBridgeDelegate* delegate_; // Weak. Owns this.
// Initializes with the given delegate and registers for notifications on
// scroller style changes.
- (id)initWithDelegate:(ViewsScrollbarBridgeDelegate*)delegate;
// Sets |delegate_| to nullptr.
// Returns the style of scrollers that OSX is using.
+ (NSScrollerStyle)getPreferredScrollerStyle;