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We are going to use `StyleSizeOverrides` in nsLayoutUtils.h in Part 4 that requires a full definition of `StyleSizeOverrides`. but we don't want to include the entire ReflowInput.h in nsLayoutUtils.h that can add unnecessary header dependency. We could also move it into LayoutConstants.h that has been included by nsLayoutUtils.h, but the header is a home for layout constants. Therefore, I create a new header for layout helper classes and structs. Differential Revision: https://phabricator.services.mozilla.com/D222049
59 lines
2.4 KiB
C++
59 lines
2.4 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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/* Helper structs or classes used throughout the Layout module */
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#ifndef mozilla_LayoutStructs_h
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#define mozilla_LayoutStructs_h
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#include "mozilla/AspectRatio.h"
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#include "mozilla/ServoStyleConsts.h"
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namespace mozilla {
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/**
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* A set of StyleSizes used as an input parameter to various functions that
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* compute sizes like nsIFrame::ComputeSize(). If any of the member fields has a
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* value, the function may use the value instead of retrieving it from the
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* frame's style.
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*
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* The logical sizes are assumed to be in the associated frame's writing-mode.
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*/
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struct StyleSizeOverrides {
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Maybe<StyleSize> mStyleISize;
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Maybe<StyleSize> mStyleBSize;
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Maybe<AspectRatio> mAspectRatio;
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bool HasAnyOverrides() const { return mStyleISize || mStyleBSize; }
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bool HasAnyLengthOverrides() const {
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return (mStyleISize && mStyleISize->ConvertsToLength()) ||
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(mStyleBSize && mStyleBSize->ConvertsToLength());
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}
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// By default, table wrapper frame considers the size overrides applied to
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// itself, so it creates any length size overrides for inner table frame by
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// subtracting the area occupied by the caption and border & padding according
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// to box-sizing.
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//
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// When this flag is true, table wrapper frame is required to apply the size
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// overrides to the inner table frame directly, without any modification,
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// which is useful for flex container to override the inner table frame's
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// preferred main size with 'flex-basis'.
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//
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// Note: if mStyleISize is a LengthPercentage, the inner table frame will
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// comply with the inline-size override without enforcing its min-content
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// inline-size in nsTableFrame::ComputeSize(). This is necessary so that small
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// flex-basis values like 'flex-basis:1%' can be resolved correctly; the
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// flexbox layout algorithm does still explicitly clamp to min-sizes *at a
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// later step*, after the flex-basis has been resolved -- so this flag won't
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// actually produce any user-visible tables whose final inline size is smaller
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// than their min-content inline size.
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bool mApplyOverridesVerbatim = false;
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};
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} // namespace mozilla
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#endif // mozilla_LayoutStructs_h
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