Tools/TestWebKitAPI/Tests/ios/WKScrollViewTests.mm

/*
 * Copyright (C) 2018 Apple Inc. All rights reserved.
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 *
 * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
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 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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#import "config.h"

#if PLATFORM(IOS_FAMILY)

#import "PlatformUtilities.h"
#import "TestWKWebView.h"
#import <WebKit/WKWebViewPrivate.h>

static void traverseLayerTree(CALayer *layer, void(^block)(CALayer *))
{
    for (CALayer *child in layer.sublayers)
        traverseLayerTree(child, block);
    block(layer);
}

TEST(WKScrollViewTests, PositionFixedLayerAfterScrolling)
{
    auto webView = adoptNS([[TestWKWebView alloc] initWithFrame:CGRectMake(0, 0, 320, 500)]);
    [webView synchronouslyLoadTestPageNamed:@"fixed-nav-bar"];

    __block bool done = false;
    [webView _doAfterNextPresentationUpdate:^() {
        done = true;
    }];

    [CATransaction begin];
    [webView scrollView].contentOffset = CGPointMake(0, 5000);
    [CATransaction commit];

    // Purposefully hang the main thread for a short while to give the remote layer tree transaction an
    // opportunity to arrive in the UI process before dispatching the next visible content rect update.
    usleep(USEC_PER_SEC * 0.25);

    TestWebKitAPI::Util::run(&done);

    bool foundLayerForFixedNavigationBar = false;
    traverseLayerTree([webView layer], [&] (CALayer *layer) {
        if (!CGSizeEqualToSize(layer.bounds.size, CGSizeMake(320, 50)))
            return;

        auto boundsInWebViewCoordinates = [layer convertRect:layer.bounds toLayer:[webView layer]];
        EXPECT_EQ(CGRectGetMinX(boundsInWebViewCoordinates), 0);
        EXPECT_EQ(CGRectGetMinY(boundsInWebViewCoordinates), 0);
        foundLayerForFixedNavigationBar = true;
    });
    EXPECT_TRUE(foundLayerForFixedNavigationBar);
}

#endif // PLATFORM(IOS_FAMILY)