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64 lines
2.3 KiB
C++
64 lines
2.3 KiB
C++
/* -*- Mode: C++; tab-width: 2; 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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#ifndef mozilla_RubyUtils_h_
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#define mozilla_RubyUtils_h_
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#include "nsGkAtoms.h"
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#include "nsIFrame.h"
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namespace mozilla {
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/**
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* Reserved ISize
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*
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* With some exceptions, each ruby internal box has two isizes, which
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* are the reflowed isize and the final isize. The reflowed isize is
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* what a box itself needs. It is determined when the box gets reflowed.
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*
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* The final isize is what a box should be as the final result. For a
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* ruby base/text box, the final isize is the size of its ruby column.
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* For a ruby base/text container, the final isize is the size of its
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* ruby segment. The final isize is never smaller than the reflowed
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* isize. It is initially determined when a ruby column/segment gets
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* fully reflowed, and may be advanced when a box is expanded, e.g.
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* for justification.
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*
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* The difference between the reflowed isize and the final isize is
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* reserved in the line layout after reflowing a box, hence it is called
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* "Reserved ISize" here. It is used to expand the ruby boxes from their
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* reflowed isize to the final isize during alignment of the line.
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*
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* There are three exceptions for the final isize:
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* 1. A ruby text container has a larger final isize only if it is for
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* a span or collapsed annotations.
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* 2. A ruby base container has a larger final isize only if at least
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* one of its ruby text containers does.
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* 3. If a ruby text container has a larger final isize, its children
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* must not have.
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*/
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class RubyUtils
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{
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public:
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static inline bool IsExpandableRubyBox(nsIFrame* aFrame)
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{
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nsIAtom* type = aFrame->GetType();
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return type == nsGkAtoms::rubyBaseFrame ||
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type == nsGkAtoms::rubyTextFrame ||
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type == nsGkAtoms::rubyBaseContainerFrame ||
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type == nsGkAtoms::rubyTextContainerFrame;
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}
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static void SetReservedISize(nsIFrame* aFrame, nscoord aISize);
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static void ClearReservedISize(nsIFrame* aFrame);
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static nscoord GetReservedISize(nsIFrame* aFrame);
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};
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}
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#endif /* !defined(mozilla_RubyUtils_h_) */
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