63 lines
2.4 KiB
C++
63 lines
2.4 KiB
C++
/*
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* Copyright (C) 2019 Igalia S.L. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
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* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "config.h"
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#include "ScrollBehavior.h"
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#include "Element.h"
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#include "RenderElement.h"
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#include "RenderStyle.h"
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#include "Settings.h"
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namespace WebCore {
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bool useSmoothScrolling(ScrollBehavior behavior, Element* associatedElement)
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{
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if (!associatedElement)
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return false;
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// FIXME: Should we use document()->scrollingElement()?
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// See https://bugs.webkit.org/show_bug.cgi?id=205059
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if (associatedElement == associatedElement->document().scrollingElement())
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associatedElement = associatedElement->document().documentElement();
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if (!associatedElement->renderer() || !associatedElement->document().settings().CSSOMViewSmoothScrollingEnabled())
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return false;
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// https://drafts.csswg.org/cssom-view/#scrolling
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switch (behavior) {
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case ScrollBehavior::Auto:
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return associatedElement->renderer()->style().useSmoothScrolling();
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case ScrollBehavior::Instant:
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return false;
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case ScrollBehavior::Smooth:
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return true;
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}
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ASSERT_NOT_REACHED();
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return false;
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}
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} // namespace WebCore
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