зеркало из https://github.com/mozilla/gecko-dev.git
65 строки
2.6 KiB
C++
65 строки
2.6 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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/* Utility code for performing CSS Box Alignment */
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#ifndef mozilla_CSSAlignUtils_h
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#define mozilla_CSSAlignUtils_h
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#include "mozilla/WritingModes.h"
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namespace mozilla {
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struct ReflowInput;
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class CSSAlignUtils {
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public:
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/**
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* Flags to customize the behavior of AlignJustifySelf:
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*/
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enum class AlignJustifyFlags {
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NoFlags = 0,
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// Indicates that we have <overflow-position> = safe.
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OverflowSafe = 1 << 0,
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// Indicates that the container's start side in aAxis is the same
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// as the child's start side in the child's parallel axis.
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SameSide = 1 << 1,
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// Indicates that AlignJustifySelf() shouldn't expand "auto" margins.
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// (By default, AlignJustifySelf() *will* expand such margins, to fill the
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// available space before any alignment is done.)
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IgnoreAutoMargins = 1 << 2,
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};
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/**
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* This computes the aligned offset of a CSS-aligned child within its
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* alignment container. The returned offset is distance between the
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* logical "start" edge of the alignment container & the logical "start" edge
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* of the aligned child (in terms of the alignment container's writing mode).
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*
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* @param aAlignment An enumerated value representing a keyword for
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* "align-self" or "justify-self". The values
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* NS_STYLE_ALIGN_{AUTO,LEFT,RIGHT} must *not* be
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* passed here; this method expects the caller to have
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* already resolved those to 'start', 'end', or 'stretch'.
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* @param aAxis The container's axis in which we're doing alignment.
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* @param aBaselineAdjust The amount to offset baseline-aligned children.
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* @param aCBSize The size of the alignment container, in its aAxis.
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* @param aRI A ReflowInput for the child.
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* @param aChildSize The child's LogicalSize (in its own writing mode).
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*/
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static nscoord AlignJustifySelf(uint8_t aAlignment, LogicalAxis aAxis,
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AlignJustifyFlags aFlags,
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nscoord aBaselineAdjust, nscoord aCBSize,
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const ReflowInput& aRI,
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const LogicalSize& aChildSize);
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};
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MOZ_MAKE_ENUM_CLASS_BITWISE_OPERATORS(CSSAlignUtils::AlignJustifyFlags)
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} // namespace mozilla
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#endif // mozilla_CSSAlignUtils_h
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