зеркало из https://github.com/mozilla/gecko-dev.git
109 строки
3.8 KiB
C++
109 строки
3.8 KiB
C++
/* -*- 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/. */
|
|
|
|
/* constants used throughout the Layout module */
|
|
|
|
#ifndef LayoutConstants_h___
|
|
#define LayoutConstants_h___
|
|
|
|
#include "mozilla/EnumSet.h"
|
|
#include "Units.h"
|
|
|
|
/**
|
|
* Constant used to indicate an unconstrained size.
|
|
*
|
|
* NOTE: The constants defined in this file are semantically used as symbolic
|
|
* values, so user should not depend on the underlying numeric values. If
|
|
* new specific use cases arise, define a new constant here.
|
|
*/
|
|
inline constexpr nscoord NS_UNCONSTRAINEDSIZE = nscoord_MAX;
|
|
|
|
// NS_AUTOOFFSET is assumed to have the same value as NS_UNCONSTRAINEDSIZE.
|
|
inline constexpr nscoord NS_AUTOOFFSET = NS_UNCONSTRAINEDSIZE;
|
|
|
|
// +1 is to avoid clamped huge margin values being processed as auto margins
|
|
inline constexpr nscoord NS_AUTOMARGIN = NS_UNCONSTRAINEDSIZE + 1;
|
|
|
|
inline constexpr nscoord NS_INTRINSIC_ISIZE_UNKNOWN = nscoord_MIN;
|
|
|
|
namespace mozilla {
|
|
|
|
/**
|
|
* Bit-flags to pass to various functions that compute sizes like
|
|
* nsIFrame::ComputeSize().
|
|
*/
|
|
enum class ComputeSizeFlag : uint8_t {
|
|
/**
|
|
* Set if the frame is in a context where non-replaced blocks should
|
|
* shrink-wrap (e.g., it's floating, absolutely positioned, or
|
|
* inline-block).
|
|
*/
|
|
ShrinkWrap,
|
|
|
|
/**
|
|
* Set if this is a grid measuring reflow, to prevent stretching.
|
|
*/
|
|
IsGridMeasuringReflow,
|
|
|
|
/**
|
|
* Indicates that we should clamp the margin-box min-size to the given CB
|
|
* size. This is used for implementing the grid area clamping here:
|
|
* https://drafts.csswg.org/css-grid/#min-size-auto
|
|
*/
|
|
IClampMarginBoxMinSize, // clamp in our inline axis
|
|
BClampMarginBoxMinSize, // clamp in our block axis
|
|
|
|
/**
|
|
* The frame is stretching (per CSS Box Alignment) and doesn't have an
|
|
* Automatic Minimum Size in the indicated axis.
|
|
* (may be used for both flex/grid items, but currently only used for Grid)
|
|
* https://drafts.csswg.org/css-grid/#min-size-auto
|
|
* https://drafts.csswg.org/css-align-3/#valdef-justify-self-stretch
|
|
*/
|
|
IApplyAutoMinSize, // Only has an effect when the ShrinkWrap bit is unset.
|
|
};
|
|
using ComputeSizeFlags = mozilla::EnumSet<ComputeSizeFlag>;
|
|
|
|
/**
|
|
* The fallback size of width is 300px and the aspect-ratio is 2:1, based on
|
|
* CSS2 section 10.3.2 and CSS Sizing Level 3 section 5.1:
|
|
* https://drafts.csswg.org/css2/visudet.html#inline-replaced-width
|
|
* https://drafts.csswg.org/css-sizing-3/#intrinsic-sizes
|
|
*/
|
|
inline constexpr CSSIntCoord kFallbackIntrinsicWidthInPixels(300);
|
|
inline constexpr CSSIntCoord kFallbackIntrinsicHeightInPixels(150);
|
|
inline constexpr CSSIntSize kFallbackIntrinsicSizeInPixels(
|
|
kFallbackIntrinsicWidthInPixels, kFallbackIntrinsicHeightInPixels);
|
|
|
|
inline constexpr nscoord kFallbackIntrinsicWidth =
|
|
kFallbackIntrinsicWidthInPixels * AppUnitsPerCSSPixel();
|
|
inline constexpr nscoord kFallbackIntrinsicHeight =
|
|
kFallbackIntrinsicHeightInPixels * AppUnitsPerCSSPixel();
|
|
inline constexpr nsSize kFallbackIntrinsicSize(kFallbackIntrinsicWidth,
|
|
kFallbackIntrinsicHeight);
|
|
|
|
/**
|
|
* This is used in some nsLayoutUtils functions.
|
|
* Declared here so that fewer files need to include nsLayoutUtils.h.
|
|
*/
|
|
enum class IntrinsicISizeType { MinISize, PrefISize };
|
|
|
|
enum class ContentRelevancyReason {
|
|
// If the content of this Frame is on screen or nearly on screen.
|
|
Visible,
|
|
|
|
// If this Frame's element has focus in its subtree.
|
|
FocusInSubtree,
|
|
|
|
// If this Frame's content is part of a selection.
|
|
Selected,
|
|
};
|
|
using ContentRelevancy = EnumSet<ContentRelevancyReason, uint8_t>;
|
|
|
|
} // namespace mozilla
|
|
|
|
#endif // LayoutConstants_h___
|