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// Copyright 2016 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#import "components/remote_cocoa/app_shim/views_scrollbar_bridge.h"
#include "base/check.h"
#include "base/memory/raw_ptr.h"
@interface ViewsScrollbarBridge ()
// Called when we receive a NSPreferredScrollerStyleDidChangeNotification.
- (void)onScrollerStyleChanged:(NSNotification*)notification;
@end
@implementation ViewsScrollbarBridge {
raw_ptr<ViewsScrollbarBridgeDelegate> _delegate; // Weak. Owns this.
}
- (instancetype)initWithDelegate:(ViewsScrollbarBridgeDelegate*)delegate {
if ((self = [super init])) {
_delegate = delegate;
[NSNotificationCenter.defaultCenter
addObserver:self
selector:@selector(onScrollerStyleChanged:)
name:NSPreferredScrollerStyleDidChangeNotification
object:nil];
}
return self;
}
- (void)dealloc {
DCHECK(!_delegate);
}
- (void)clearDelegate {
_delegate = nullptr;
[NSNotificationCenter.defaultCenter removeObserver:self];
}
- (void)onScrollerStyleChanged:(NSNotification*)notification {
if (_delegate)
_delegate->OnScrollerStyleChanged();
}
+ (NSScrollerStyle)preferredScrollerStyle {
return NSScroller.preferredScrollerStyle;
}
@end
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