Tools/TestWebKitAPI/Tests/ios/WKScrollViewDelegate.mm

/*
 * Copyright (C) 2016-2018 Apple Inc. All rights reserved.
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 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
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 * 1. Redistributions of source code must retain the above copyright
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 *
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 * 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
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#import "config.h"

#if PLATFORM(IOS_FAMILY)

#import "PlatformUtilities.h"
#import "Test.h"
#import "TestWKWebView.h"
#import <WebKit/WKWebView.h>

// WKScrollViewDelegateCrash

static bool delegateIsDeallocated;

@interface TestDelegateForScrollView : NSObject <UIScrollViewDelegate>

@end

@implementation TestDelegateForScrollView

- (void)dealloc
{
    delegateIsDeallocated = true;
    [super dealloc];
}

@end

namespace TestWebKitAPI {

TEST(WKWebView, WKScrollViewDelegateCrash)
{
    auto webView = adoptNS([[WKWebView alloc] init]);
    auto delegateForScrollView = adoptNS([[TestDelegateForScrollView alloc] init]);
    @autoreleasepool {
        [webView scrollView].delegate = delegateForScrollView.get();
    }
    delegateIsDeallocated = false;
    delegateForScrollView = nil;
    TestWebKitAPI::Util::run(&delegateIsDeallocated);

    EXPECT_NULL([webView scrollView].delegate);
}

}

// WKScrollViewDelegateCannotOverrideViewForZooming

static BOOL didCallViewForZoomingInScrollView;

@interface WKScrollViewDelegateWithViewForZoomingOverridden : NSObject <UIScrollViewDelegate>
@property (nonatomic, assign) CGFloat overrideScale;
@end

@implementation WKScrollViewDelegateWithViewForZoomingOverridden

- (UIView *)viewForZoomingInScrollView:(UIScrollView *)scrollView
{
    didCallViewForZoomingInScrollView = true;

    UIView *fakeZoomingView = [[UIView alloc] init];
    fakeZoomingView.layer.affineTransform = CGAffineTransformMakeScale(_overrideScale, _overrideScale);
    return fakeZoomingView;
}

@end

namespace TestWebKitAPI {

TEST(WKWebView, WKScrollViewDelegateCannotOverrideViewForZooming)
{
    auto webView = adoptNS([[TestWKWebView alloc] init]);
    auto delegateForScrollView = adoptNS([[WKScrollViewDelegateWithViewForZoomingOverridden alloc] init]);
    @autoreleasepool {
        [webView scrollView].delegate = delegateForScrollView.get();
    }

    [webView synchronouslyLoadHTMLString:@"<meta name='viewport' content='initial-scale=1'>"];
    [webView waitForNextPresentationUpdate];

    // Have WKScrollView's external delegate return a view with scale=2 from viewForZoomingInScrollView.
    [delegateForScrollView setOverrideScale:2];

    [webView synchronouslyLoadHTMLString:@"<meta name='viewport' content='initial-scale=2'>"];
    [webView waitForNextPresentationUpdate];

    @autoreleasepool {
        [webView scrollView].delegate = nil;
    }

    EXPECT_FALSE(didCallViewForZoomingInScrollView);
    EXPECT_EQ(2, [[webView scrollView] zoomScale]);
}

}

#endif