WKScrollViewMac.mm   [plain text]

/*
* Copyright (C) 2020 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
* THE POSSIBILITY OF SUCH DAMAGE.
*/

#import "config.h"
#import "WKScrollViewMac.h"

#if PLATFORM(MAC)

#import <wtf/WeakObjCPtr.h>

@implementation WKScrollView {
WeakObjCPtr<id <WKScrollViewDelegate>> _delegate;
}

+ (BOOL)isCompatibleWithResponsiveScrolling
{
return NO;
}

- (instancetype)initWithFrame:(NSRect)frame
{
self = [super initWithFrame:frame];
if (!self)
return nil;

self.allowsMagnification = YES;
self.minMagnification = 1; // Matches ViewGestureController.
self.maxMagnification = 3;

[self.contentView setPostsBoundsChangedNotifications:YES];
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(boundsDidChange:) name:NSViewBoundsDidChangeNotification object:self.contentView];
return self;
}

- (void)dealloc
{
[[NSNotificationCenter defaultCenter] removeObserver:self];
[super dealloc];
}

- (id <WKScrollViewDelegate>)delegate
{
return _delegate.getAutoreleased();
}

- (void)setDelegate:(id <WKScrollViewDelegate>)delegate
{
_delegate = delegate;
}

- (CGPoint)contentOffset
{
return self.contentView.bounds.origin;
}

- (void)boundsDidChange:(NSNotification *)notification
{
auto retainedDelegate = _delegate.get();
if (retainedDelegate)
[retainedDelegate scrollViewDidScroll:self];
}

- (void)setContentInsets:(NSEdgeInsets)insets
{
BOOL insetsChanged = !NSEdgeInsetsEqual(insets, self.contentInsets);
[super setContentInsets:insets];
if (insetsChanged) {
auto retainedDelegate = _delegate.get();
if (retainedDelegate)
[retainedDelegate scrollViewContentInsetsDidChange:self];
}
}

@end

#endif // PLATFORM(MAC)