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-rw-r--r--layout/generic/CSSAlignUtils.h65
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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/WritingModes.h"
+
+namespace mozilla {
+
+struct ReflowInput;
+struct StyleAlignFlags;
+
+class CSSAlignUtils {
+ public:
+ /**
+ * Flags to customize the behavior of AlignJustifySelf:
+ */
+ enum class AlignJustifyFlags {
+ NoFlags = 0,
+ // Indicates that we have <overflow-position> = safe.
+ OverflowSafe = 1 << 0,
+ // 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 = 1 << 1,
+ // 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 = 1 << 2,
+ };
+
+ /**
+ * 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).
+ */
+ static nscoord AlignJustifySelf(const StyleAlignFlags& aAlignment,
+ LogicalAxis aAxis, AlignJustifyFlags aFlags,
+ nscoord aBaselineAdjust, nscoord aCBSize,
+ const ReflowInput& aRI,
+ const LogicalSize& aChildSize);
+};
+
+MOZ_MAKE_ENUM_CLASS_BITWISE_OPERATORS(CSSAlignUtils::AlignJustifyFlags)
+
+} // namespace mozilla
+
+#endif // mozilla_CSSAlignUtils_h