blob: 11d4fdb440592718e917dc411436c41d517966a3 [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_bridge_mac/views_bridge_mac_export.h"
// The delegate set to ViewsScrollbarBridge.
class VIEWS_BRIDGE_MAC_EXPORT 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.
- (instancetype)initWithDelegate:(ViewsScrollbarBridgeDelegate*)delegate;
// Sets |delegate_| to nullptr.
- (void)clearDelegate;
// Returns the style of scrollers that OSX is using.
+ (NSScrollerStyle)getPreferredScrollerStyle;