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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
/* Utility code for performing CSS Box Alignment */
#ifndef mozilla_CSSAlignUtils_h
#define mozilla_CSSAlignUtils_h
#include "mozilla/EnumSet.h"
#include "mozilla/WritingModes.h"
namespace mozilla {
struct ReflowInput;
struct StyleAlignFlags;
class CSSAlignUtils {
public:
/**
* Map a raw StyleAlignFlags value to the used one.
*/
static StyleAlignFlags UsedAlignmentForAbsPos(nsIFrame* aFrame,
StyleAlignFlags aFlags,
LogicalAxis aLogicalAxis,
WritingMode aCBWM);
/**
* Flags to customize the behavior of AlignJustifySelf:
*/
enum class AlignJustifyFlag {
// Indicates that we have <overflow-position> = safe.
OverflowSafe,
// Indicates that the container's start side in aAxis is the same
// as the child's start side in the child's parallel axis.
SameSide,
// Indicates that AlignJustifySelf() shouldn't expand "auto" margins.
// (By default, AlignJustifySelf() *will* expand such margins, to fill the
// available space before any alignment is done.)
IgnoreAutoMargins,
// We're aligning a margin box - the margin is already included in the
// size. Implies `IgnoreAutoMargins`.
AligningMarginBox,
// If the item is baseline-aligned, this flag indicates that the item is in
// the last baseline sharing group of the container, otherwise the item is
// in the container's first baseline sharing group.
LastBaselineSharingGroup,
};
using AlignJustifyFlags = EnumSet<AlignJustifyFlag>;
/**
* Additional information required to resolve anchor-center on a particular
* axis.
*/
struct AnchorAlignInfo {
nscoord mAnchorStart;
nscoord mAnchorSize;
};
/**
* This computes the aligned offset of a CSS-aligned child within its
* alignment container. The returned offset is distance between the
* logical "start" edge of the alignment container & the logical "start" edge
* of the aligned child (in terms of the alignment container's writing mode).
*
* @param aAlignment An enumerated value representing a keyword for
* "align-self" or "justify-self". The values
* StyleAlignFlags::{AUTO,LEFT,RIGHT} must *not* be
* passed here; this method expects the caller to have
* already resolved those to 'start', 'end', or 'stretch'.
* @param aAxis The container's axis in which we're doing alignment.
* @param aBaselineAdjust The amount to offset baseline-aligned children.
* @param aCBSize The size of the alignment container, in its aAxis.
* @param aRI A ReflowInput for the child.
* @param aChildSize The child's LogicalSize (in its own writing mode).
* @param aAnchorInfo When specified, an inset-modified anchor start and size
* (in the child's writing mode) to use for anchor-center alignment.
*/
static nscoord AlignJustifySelf(
const StyleAlignFlags& aAlignment, LogicalAxis aAxis,
AlignJustifyFlags aFlags, nscoord aBaselineAdjust, nscoord aCBSize,
const ReflowInput& aRI, const LogicalSize& aChildSize,
const Maybe<AnchorAlignInfo>& aAnchorRect = Nothing());
};
} // namespace mozilla
#endif // mozilla_CSSAlignUtils_h
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