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f85b73bf84
Add an implementation of CSS `contain: style`. This introduces two new data structures, the ContainStyleScope and ContainStyleScopeManager. ContainStyleScope manages one `contain: style` "world" which has its own counter and quote lists. The contents of these lists depend on their parent scopes, but are not affected by their children. ContainStyleScopeManager manages a tree of scopes starting at a root scope which is outside of any `contain: style` element. Scopes are stored in a hash table that is keyed off of the nsIContent which establishes the `contain: style` scope. When modifying quote or content lists, the ContainStyleScopeManager is responsible for finding the appropriate `contain: style` scope to modify. Perhaps the most complex part of this is that counters and quotes have read access to the state of counters and quotes that are in ancestor `contain: style` scopes. In the case of counters, USE nodes that are at the beginning of counter lists might have a counter scope that starts in an ancestor `contain: style` scope. When nsCounterNode::SetScope() is called, the code may look upward in the `contain: style` scope tree to find the start of the counter scope. In the case of quotes, the first node in the quote list must look for the state of quotes in ancestor `contain: style` scopes. Differential Revision: https://phabricator.services.mozilla.com/D149508
101 lines
3.1 KiB
C++
101 lines
3.1 KiB
C++
/* -*- Mode: C++; tab-width: 8; 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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/* implementation of quotes for the CSS 'content' property */
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#ifndef nsQuoteList_h___
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#define nsQuoteList_h___
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#include "mozilla/Attributes.h"
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#include "nsGenConList.h"
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namespace mozilla {
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class ContainStyleScope;
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} // namespace mozilla
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struct nsQuoteNode : public nsGenConNode {
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// open-quote, close-quote, no-open-quote, or no-close-quote
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const StyleContentType mType;
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// Quote depth before this quote, which is always non-negative.
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int32_t mDepthBefore;
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nsQuoteNode(StyleContentType aType, uint32_t aContentIndex)
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: nsGenConNode(aContentIndex), mType(aType), mDepthBefore(0) {
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NS_ASSERTION(aType == StyleContentType::OpenQuote ||
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aType == StyleContentType::CloseQuote ||
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aType == StyleContentType::NoOpenQuote ||
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aType == StyleContentType::NoCloseQuote,
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"incorrect type");
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NS_ASSERTION(aContentIndex <= INT32_MAX, "out of range");
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}
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virtual bool InitTextFrame(nsGenConList* aList, nsIFrame* aPseudoFrame,
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nsIFrame* aTextFrame) override;
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// is this 'open-quote' or 'no-open-quote'?
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bool IsOpenQuote() {
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return mType == StyleContentType::OpenQuote ||
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mType == StyleContentType::NoOpenQuote;
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}
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// is this 'close-quote' or 'no-close-quote'?
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bool IsCloseQuote() { return !IsOpenQuote(); }
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// is this 'open-quote' or 'close-quote'?
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bool IsRealQuote() {
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return mType == StyleContentType::OpenQuote ||
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mType == StyleContentType::CloseQuote;
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}
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// Depth of the quote for *this* node. Either non-negative or -1.
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// -1 means this is a closing quote that tried to decrement the
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// counter below zero (which means no quote should be rendered).
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int32_t Depth() { return IsOpenQuote() ? mDepthBefore : mDepthBefore - 1; }
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// always non-negative
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int32_t DepthAfter() {
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return IsOpenQuote() ? mDepthBefore + 1
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: (mDepthBefore == 0 ? 0 : mDepthBefore - 1);
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}
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// The text that should be displayed for this quote.
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nsString Text();
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};
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class nsQuoteList : public nsGenConList {
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private:
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nsQuoteNode* FirstNode() {
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return static_cast<nsQuoteNode*>(mList.getFirst());
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}
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public:
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explicit nsQuoteList(mozilla::ContainStyleScope* aScope) : mScope(aScope) {}
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// assign the correct |mDepthBefore| value to a node that has been inserted
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// Should be called immediately after calling |Insert|.
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void Calc(nsQuoteNode* aNode);
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nsQuoteNode* Next(nsQuoteNode* aNode) {
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return static_cast<nsQuoteNode*>(nsGenConList::Next(aNode));
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}
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nsQuoteNode* Prev(nsQuoteNode* aNode) {
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return static_cast<nsQuoteNode*>(nsGenConList::Prev(aNode));
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}
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void RecalcAll();
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#ifdef DEBUG
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void PrintChain();
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#endif
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private:
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mozilla::ContainStyleScope* mScope;
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};
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#endif /* nsQuoteList_h___ */
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