LayoutStructs.h (2489B)
1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ 2 /* vim: set ts=8 sts=2 et sw=2 tw=80: */ 3 /* This Source Code Form is subject to the terms of the Mozilla Public 4 * License, v. 2.0. If a copy of the MPL was not distributed with this 5 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ 6 7 /* Helper structs or classes used throughout the Layout module */ 8 9 #ifndef mozilla_LayoutStructs_h 10 #define mozilla_LayoutStructs_h 11 12 #include "mozilla/AspectRatio.h" 13 #include "mozilla/ServoStyleConsts.h" 14 15 namespace mozilla { 16 17 /** 18 * A set of StyleSizes used as an input parameter to various functions that 19 * compute sizes like nsIFrame::ComputeSize(). If any of the member fields has a 20 * value, the function may use the value instead of retrieving it from the 21 * frame's style. 22 * 23 * The logical sizes are assumed to be in the associated frame's writing-mode. 24 */ 25 struct StyleSizeOverrides { 26 Maybe<StyleSize> mStyleISize; 27 Maybe<StyleSize> mStyleBSize; 28 Maybe<AspectRatio> mAspectRatio; 29 30 bool HasAnyOverrides() const { return mStyleISize || mStyleBSize; } 31 bool HasAnyLengthOverrides() const { 32 return (mStyleISize && mStyleISize->ConvertsToLength()) || 33 (mStyleBSize && mStyleBSize->ConvertsToLength()); 34 } 35 36 // By default, table wrapper frame considers the size overrides applied to 37 // itself, so it creates any length size overrides for inner table frame by 38 // subtracting the area occupied by the caption and border & padding according 39 // to box-sizing. 40 // 41 // When this flag is true, table wrapper frame is required to apply the size 42 // overrides to the inner table frame directly, without any modification, 43 // which is useful for flex container to override the inner table frame's 44 // preferred main size with 'flex-basis'. 45 // 46 // Note: if mStyleISize is a LengthPercentage, the inner table frame will 47 // comply with the inline-size override without enforcing its min-content 48 // inline-size in nsTableFrame::ComputeSize(). This is necessary so that small 49 // flex-basis values like 'flex-basis:1%' can be resolved correctly; the 50 // flexbox layout algorithm does still explicitly clamp to min-sizes *at a 51 // later step*, after the flex-basis has been resolved -- so this flag won't 52 // actually produce any user-visible tables whose final inline size is smaller 53 // than their min-content inline size. 54 bool mApplyOverridesVerbatim = false; 55 }; 56 57 } // namespace mozilla 58 59 #endif // mozilla_LayoutStructs_h