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/*
* Copyright (C) 2019 Igalia S.L. 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. ``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
* 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.
*/
#include "config.h"
#include "ScrollBehavior.h"
#include "Element.h"
#include "RenderElement.h"
#include "RenderStyleInlines.h"
#include "Settings.h"
namespace WebCore {
bool useSmoothScrolling(ScrollBehavior behavior, Element* associatedElement)
{
if (!associatedElement)
return false;
// FIXME: Should we use document()->scrollingElement()?
// See https://bugs.webkit.org/show_bug.cgi?id=205059
if (associatedElement == associatedElement->document().scrollingElement())
associatedElement = associatedElement->document().documentElement();
if (!associatedElement->renderer() || !associatedElement->document().settings().CSSOMViewSmoothScrollingEnabled())
return false;
// https://drafts.csswg.org/cssom-view/#scrolling
switch (behavior) {
case ScrollBehavior::Auto:
return associatedElement->renderer()->style().useSmoothScrolling();
case ScrollBehavior::Instant:
return false;
case ScrollBehavior::Smooth:
return true;
}
ASSERT_NOT_REACHED();
return false;
}
} // namespace WebCore
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