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3fdf3d9eee
This makes updates work correctly when variable values change. Rather than handling nsStyleVariables with a DO_STRUCT_DIFFERENCE, we explicitly compare the two nsStyleVariables objects in nsStyleContext::CalcStyleDifference before looking at the other style structs. This is because we need to force those other style structs to be compared if variable values are changing. nsStyleVariables::CalcDifference still returns 0, since the change in variable values themselves doesn't require any updates.
128 lines
4.0 KiB
C++
128 lines
4.0 KiB
C++
/* vim: set shiftwidth=2 tabstop=8 autoindent cindent expandtab: */
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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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/* computed CSS Variable values */
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#ifndef mozilla_CSSVariableValues_h
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#define mozilla_CSSVariableValues_h
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#include "nsCSSScanner.h"
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#include "nsDataHashtable.h"
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#include "nsTArray.h"
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namespace mozilla {
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class CSSVariableResolver;
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class CSSVariableValues
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{
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public:
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CSSVariableValues();
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CSSVariableValues(const CSSVariableValues& aOther);
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#ifdef DEBUG
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~CSSVariableValues();
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#endif
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CSSVariableValues& operator=(const CSSVariableValues& aOther);
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bool operator==(const CSSVariableValues& aOther) const;
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bool operator!=(const CSSVariableValues& aOther) const
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{ return !(*this == aOther); }
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/**
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* Gets the value of a variable in this set of computed variables.
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*
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* @param aName The variable name (not including any "var-" prefix that would
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* be part of the custom property name).
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* @param aValue Out parameter into which the value of the variable will
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* be stored.
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* @return Whether a variable with the given name was found. When false
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* is returned, aValue will not be modified.
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*/
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bool Get(const nsAString& aName, nsString& aValue) const;
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/**
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* Gets the value of a variable in this set of computed variables, along
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* with information on the types of tokens that appear at the start and
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* end of the token stream.
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*
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* @param aName The variable name (not including any "var-" prefix that would
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* be part of the custom property name).
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* @param aValue Out parameter into which the value of the variable will
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* be stored.
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* @param aFirstToken The type of token at the start of the variable value.
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* @param aLastToken The type of token at the en of the variable value.
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* @return Whether a variable with the given name was found. When false
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* is returned, aValue, aFirstToken and aLastToken will not be modified.
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*/
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bool Get(const nsAString& aName,
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nsString& aValue,
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nsCSSTokenSerializationType& aFirstToken,
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nsCSSTokenSerializationType& aLastToken) const;
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/**
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* Adds or modifies an existing entry in this set of variable values.
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*
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* @param aName The variable name (not including any "var-" prefix that would
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* be part of the custom property name) whose value is to be set.
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* @param aValue The variable value.
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* @param aFirstToken The type of token at the start of the variable value.
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* @param aLastToken The type of token at the en of the variable value.
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*/
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void Put(const nsAString& aName,
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nsString aValue,
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nsCSSTokenSerializationType aFirstToken,
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nsCSSTokenSerializationType aLastToken);
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/**
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* Copies the variables from this object into aResolver, marking them as
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* computed, inherited values.
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*/
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void AddVariablesToResolver(CSSVariableResolver* aResolver) const;
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private:
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struct Variable
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{
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Variable()
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: mFirstToken(eCSSTokenSerialization_Nothing)
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, mLastToken(eCSSTokenSerialization_Nothing)
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{}
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Variable(const nsAString& aVariableName,
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nsString aValue,
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nsCSSTokenSerializationType aFirstToken,
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nsCSSTokenSerializationType aLastToken)
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: mVariableName(aVariableName)
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, mValue(aValue)
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, mFirstToken(aFirstToken)
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, mLastToken(aLastToken)
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{}
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nsString mVariableName;
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nsString mValue;
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nsCSSTokenSerializationType mFirstToken;
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nsCSSTokenSerializationType mLastToken;
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};
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/**
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* Adds all the variables from aOther into this object.
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*/
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void CopyVariablesFrom(const CSSVariableValues& aOther);
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/**
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* Map of variable names to IDs. Variable IDs are indexes into
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* mVariables.
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*/
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nsDataHashtable<nsStringHashKey, size_t> mVariableIDs;
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/**
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* Array of variables, indexed by variable ID.
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*/
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nsTArray<Variable> mVariables;
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};
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} // namespace mozilla
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#endif
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