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843f943758
# ignore-this-changeset Differential Revision: https://phabricator.services.mozilla.com/D85678
48 lines
1.8 KiB
C++
48 lines
1.8 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "mozilla/ScrollStyles.h"
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#include "nsStyleStruct.h" // for nsStyleDisplay
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namespace mozilla {
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// https://drafts.csswg.org/css-overflow/#overflow-propagation
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// "If `visible` is applied to the viewport, it must be interpreted as `auto`.
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// If `clip` is applied to the viewport, it must be interpreted as `hidden`."
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static StyleOverflow MapOverflowValueForViewportPropagation(
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StyleOverflow aOverflow) {
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switch (aOverflow) {
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case StyleOverflow::Visible:
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return StyleOverflow::Auto;
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case StyleOverflow::Clip:
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return StyleOverflow::Hidden;
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default:
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return aOverflow;
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}
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}
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ScrollStyles::ScrollStyles(StyleOverflow aH, StyleOverflow aV)
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: mHorizontal(aH), mVertical(aV) {
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MOZ_ASSERT(mHorizontal == StyleOverflow::Auto ||
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mHorizontal == StyleOverflow::Hidden ||
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mHorizontal == StyleOverflow::Scroll);
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MOZ_ASSERT(mVertical == StyleOverflow::Auto ||
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mVertical == StyleOverflow::Hidden ||
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mVertical == StyleOverflow::Scroll);
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}
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ScrollStyles::ScrollStyles(const nsStyleDisplay& aDisplay,
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MapOverflowToValidScrollStyleTag)
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: ScrollStyles(
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MapOverflowValueForViewportPropagation(aDisplay.mOverflowX),
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MapOverflowValueForViewportPropagation(aDisplay.mOverflowY)) {}
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bool ScrollStyles::IsHiddenInBothDirections() const {
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return mHorizontal == StyleOverflow::Hidden &&
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mVertical == StyleOverflow::Hidden;
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}
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} // namespace mozilla
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