зеркало из https://github.com/mozilla/gecko-dev.git
87 строки
3.0 KiB
C++
87 строки
3.0 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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/* constants used throughout the Layout module */
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#ifndef LayoutConstants_h___
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#define LayoutConstants_h___
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#include "mozilla/EnumSet.h"
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#include "nsSize.h" // for NS_MAXSIZE
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/**
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* Constant used to indicate an unconstrained size.
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*
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* NOTE: The constants defined in this file are semantically used as symbolic
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* values, so user should not depend on the underlying numeric values. If
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* new specific use cases arise, define a new constant here.
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*/
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#define NS_UNCONSTRAINEDSIZE NS_MAXSIZE
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// NS_AUTOOFFSET is assumed to have the same value as NS_UNCONSTRAINEDSIZE.
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#define NS_AUTOOFFSET NS_UNCONSTRAINEDSIZE
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// +1 is to avoid clamped huge margin values being processed as auto margins
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#define NS_AUTOMARGIN (NS_UNCONSTRAINEDSIZE + 1)
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#define NS_INTRINSIC_ISIZE_UNKNOWN nscoord_MIN
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// The fallback size of width is 300px and the aspect-ratio is 2:1, based on the
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// spec definition in CSS2 section 10.3.2:
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// https://drafts.csswg.org/css2/visudet.html#inline-replaced-width
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#define REPLACED_ELEM_FALLBACK_PX_WIDTH 300
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#define REPLACED_ELEM_FALLBACK_PX_HEIGHT 150
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namespace mozilla {
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/**
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* Bit-flags to pass to various functions that compute sizes like
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* nsIFrame::ComputeSize().
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*/
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enum class ComputeSizeFlag : uint8_t {
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/**
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* Set if the frame is in a context where non-replaced blocks should
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* shrink-wrap (e.g., it's floating, absolutely positioned, or
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* inline-block).
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*/
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ShrinkWrap,
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/**
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* Set if we'd like to compute our 'auto' bsize, regardless of our actual
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* corresponding computed value. (e.g. to get an intrinsic height for flex
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* items with "min-height: auto" to use during flexbox layout.)
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*/
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UseAutoBSize,
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/**
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* Indicates that we should clamp the margin-box min-size to the given CB
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* size. This is used for implementing the grid area clamping here:
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* https://drafts.csswg.org/css-grid/#min-size-auto
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*/
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IClampMarginBoxMinSize, // clamp in our inline axis
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BClampMarginBoxMinSize, // clamp in our block axis
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/**
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* The frame is stretching (per CSS Box Alignment) and doesn't have an
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* Automatic Minimum Size in the indicated axis.
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* (may be used for both flex/grid items, but currently only used for Grid)
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* https://drafts.csswg.org/css-grid/#min-size-auto
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* https://drafts.csswg.org/css-align-3/#valdef-justify-self-stretch
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*/
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IApplyAutoMinSize, // only has an effect when eShrinkWrap is false
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};
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using ComputeSizeFlags = mozilla::EnumSet<ComputeSizeFlag>;
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/**
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* This is used in some nsLayoutUtils functions.
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* Declared here so that fewer files need to include nsLayoutUtils.h.
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*/
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enum class IntrinsicISizeType { MinISize, PrefISize };
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} // namespace mozilla
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#endif // LayoutConstants_h___
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