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 /* Utility code for performing CSS Box Alignment */ 8 9 #ifndef mozilla_CSSAlignUtils_h 10 #define mozilla_CSSAlignUtils_h 11 12 #include "mozilla/WritingModes.h" 13 14 namespace mozilla { 15 16 struct ReflowInput; 17 struct StyleAlignFlags; 18 19 class CSSAlignUtils { 20 public: 21 /** 22 * Flags to customize the behavior of AlignJustifySelf: 23 */ 24 enum class AlignJustifyFlags { 25 NoFlags = 0, 26 // Indicates that we have <overflow-position> = safe. 27 OverflowSafe = 1 << 0, 28 // Indicates that the container's start side in aAxis is the same 29 // as the child's start side in the child's parallel axis. 30 SameSide = 1 << 1, 31 // Indicates that AlignJustifySelf() shouldn't expand "auto" margins. 32 // (By default, AlignJustifySelf() *will* expand such margins, to fill the 33 // available space before any alignment is done.) 34 IgnoreAutoMargins = 1 << 2, 35 }; 36 37 /** 38 * This computes the aligned offset of a CSS-aligned child within its 39 * alignment container. The returned offset is distance between the 40 * logical "start" edge of the alignment container & the logical "start" edge 41 * of the aligned child (in terms of the alignment container's writing mode). 42 * 43 * @param aAlignment An enumerated value representing a keyword for 44 * "align-self" or "justify-self". The values 45 * StyleAlignFlags::{AUTO,LEFT,RIGHT} must *not* be 46 * passed here; this method expects the caller to have 47 * already resolved those to 'start', 'end', or 'stretch'. 48 * @param aAxis The container's axis in which we're doing alignment. 49 * @param aBaselineAdjust The amount to offset baseline-aligned children. 50 * @param aCBSize The size of the alignment container, in its aAxis. 51 * @param aRI A ReflowInput for the child. 52 * @param aChildSize The child's LogicalSize (in its own writing mode). 53 */ 54 static nscoord AlignJustifySelf(const StyleAlignFlags& aAlignment, 55 LogicalAxis aAxis, AlignJustifyFlags aFlags, 56 nscoord aBaselineAdjust, nscoord aCBSize, 57 const ReflowInput& aRI, 58 const LogicalSize& aChildSize); 59 }; 60 61 MOZ_MAKE_ENUM_CLASS_BITWISE_OPERATORS(CSSAlignUtils::AlignJustifyFlags) 62 63 } // namespace mozilla 64 65 #endif // mozilla_CSSAlignUtils_h 66