mirror of
https://gitlab.winehq.org/wine/wine-gecko.git
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186 lines
5.9 KiB
C++
186 lines
5.9 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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*
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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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/*
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* representation of media lists used when linking to style sheets or by
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* @media rules
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*/
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#ifndef nsIMediaList_h_
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#define nsIMediaList_h_
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#include "nsIDOMMediaList.h"
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#include "nsTArray.h"
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#include "nsIAtom.h"
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#include "nsCSSValue.h"
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class nsPresContext;
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class nsCSSStyleSheet;
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class nsAString;
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struct nsMediaFeature;
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struct nsMediaExpression {
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enum Range { eMin, eMax, eEqual };
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const nsMediaFeature *mFeature;
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Range mRange;
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nsCSSValue mValue;
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// aActualValue must be obtained from mFeature->mGetter
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bool Matches(nsPresContext* aPresContext,
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const nsCSSValue& aActualValue) const;
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};
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/**
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* An nsMediaQueryResultCacheKey records what feature/value combinations
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* a set of media query results are valid for. This allows the caller
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* to quickly learn whether a prior result of media query evaluation is
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* still valid (e.g., due to a window size change) without rerunning all
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* of the evaluation and rebuilding the list of rules.
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*
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* This object may not be used after any media rules in any of the
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* sheets it was given to have been modified. However, this is
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* generally not a problem since ClearRuleCascades is called on the
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* sheet whenever this happens, and these objects are stored inside the
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* rule cascades. (FIXME: We're not actually doing this all the time.)
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*
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* The implementation could be further optimized in the future to store
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* ranges (combinations of less-than, less-than-or-equal, greater-than,
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* greater-than-or-equal, equal, not-equal, present, not-present) for
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* each feature rather than simply storing the list of expressions.
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* However, this requires combining any such ranges.
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*/
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class nsMediaQueryResultCacheKey {
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public:
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nsMediaQueryResultCacheKey(nsIAtom* aMedium)
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: mMedium(aMedium)
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{}
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/**
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* Record that aExpression was tested while building the cached set
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* that this cache key is for, and that aExpressionMatches was whether
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* it matched.
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*/
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void AddExpression(const nsMediaExpression* aExpression,
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bool aExpressionMatches);
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bool Matches(nsPresContext* aPresContext) const;
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private:
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struct ExpressionEntry {
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// FIXME: if we were better at maintaining invariants about clearing
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// rule cascades when media lists change, this could be a |const
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// nsMediaExpression*| instead.
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nsMediaExpression mExpression;
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bool mExpressionMatches;
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};
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struct FeatureEntry {
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const nsMediaFeature *mFeature;
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InfallibleTArray<ExpressionEntry> mExpressions;
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};
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nsCOMPtr<nsIAtom> mMedium;
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nsTArray<FeatureEntry> mFeatureCache;
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};
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class nsMediaQuery {
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public:
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nsMediaQuery()
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: mNegated(false)
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, mHasOnly(false)
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, mTypeOmitted(false)
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, mHadUnknownExpression(false)
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{
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}
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private:
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// for Clone only
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nsMediaQuery(const nsMediaQuery& aOther)
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: mNegated(aOther.mNegated)
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, mHasOnly(aOther.mHasOnly)
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, mTypeOmitted(aOther.mTypeOmitted)
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, mHadUnknownExpression(aOther.mHadUnknownExpression)
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, mMediaType(aOther.mMediaType)
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// Clone checks the result of this deep copy for allocation failure
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, mExpressions(aOther.mExpressions)
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{
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}
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public:
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void SetNegated() { mNegated = true; }
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void SetHasOnly() { mHasOnly = true; }
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void SetTypeOmitted() { mTypeOmitted = true; }
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void SetHadUnknownExpression() { mHadUnknownExpression = true; }
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void SetType(nsIAtom* aMediaType) {
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NS_ASSERTION(aMediaType,
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"expected non-null");
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mMediaType = aMediaType;
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}
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// Return a new nsMediaExpression in the array for the caller to fill
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// in. The caller must either fill it in completely, or call
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// SetHadUnknownExpression on this nsMediaQuery.
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// Returns null on out-of-memory.
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nsMediaExpression* NewExpression() { return mExpressions.AppendElement(); }
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void AppendToString(nsAString& aString) const;
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nsMediaQuery* Clone() const;
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// Does this query apply to the presentation?
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// If |aKey| is non-null, add cache information to it.
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bool Matches(nsPresContext* aPresContext,
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nsMediaQueryResultCacheKey* aKey) const;
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private:
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bool mNegated;
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bool mHasOnly; // only needed for serialization
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bool mTypeOmitted; // only needed for serialization
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bool mHadUnknownExpression;
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nsCOMPtr<nsIAtom> mMediaType;
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nsTArray<nsMediaExpression> mExpressions;
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};
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class nsMediaList : public nsIDOMMediaList {
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public:
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nsMediaList();
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NS_DECL_ISUPPORTS
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NS_DECL_NSIDOMMEDIALIST
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nsresult GetText(nsAString& aMediaText);
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nsresult SetText(const nsAString& aMediaText);
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// Does this query apply to the presentation?
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// If |aKey| is non-null, add cache information to it.
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bool Matches(nsPresContext* aPresContext,
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nsMediaQueryResultCacheKey* aKey);
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nsresult SetStyleSheet(nsCSSStyleSheet* aSheet);
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void AppendQuery(nsAutoPtr<nsMediaQuery>& aQuery) {
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// Takes ownership of aQuery
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mArray.AppendElement(aQuery.forget());
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}
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nsresult Clone(nsMediaList** aResult);
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PRInt32 Count() { return mArray.Length(); }
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nsMediaQuery* MediumAt(PRInt32 aIndex) { return mArray[aIndex]; }
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void Clear() { mArray.Clear(); }
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protected:
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~nsMediaList();
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nsresult Delete(const nsAString & aOldMedium);
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nsresult Append(const nsAString & aOldMedium);
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InfallibleTArray<nsAutoPtr<nsMediaQuery> > mArray;
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// not refcounted; sheet will let us know when it goes away
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// mStyleSheet is the sheet that needs to be dirtied when this medialist
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// changes
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nsCSSStyleSheet* mStyleSheet;
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};
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#endif /* !defined(nsIMediaList_h_) */
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