mirror of
https://github.com/mozilla/gecko-dev.git
synced 2024-10-25 11:15:34 +00:00
680815cd6e
This patch was generated automatically by the "modeline.py" script, available here: https://github.com/amccreight/moz-source-tools/blob/master/modeline.py For every file that is modified in this patch, the changes are as follows: (1) The patch changes the file to use the exact C++ mode lines from the Mozilla coding style guide, available here: https://developer.mozilla.org/en-US/docs/Mozilla/Developer_guide/Coding_Style#Mode_Line (2) The patch deletes any blank lines between the mode line & the MPL boilerplate comment. (3) If the file previously had the mode lines and MPL boilerplate in a single contiguous C++ comment, then the patch splits them into separate C++ comments, to match the boilerplate in the coding style. MozReview-Commit-ID: EuRsDue63tK --HG-- extra : rebase_source : 3356d4b80ff6213935192e87cdbc9103fec6084c
98 lines
3.5 KiB
C++
98 lines
3.5 KiB
C++
/* -*- 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/. */
|
|
|
|
/*
|
|
* internal abstract interface for objects providing immutable style
|
|
* information
|
|
*/
|
|
|
|
#ifndef nsIStyleRule_h___
|
|
#define nsIStyleRule_h___
|
|
|
|
#include <stdio.h>
|
|
|
|
#include "nsCSSPropertyID.h"
|
|
#include "nsISupports.h"
|
|
|
|
class nsCSSValue;
|
|
struct nsRuleData;
|
|
|
|
// IID for the nsIStyleRule interface {f75f3f70-435d-43a6-a01b-65970489ca26}
|
|
#define NS_ISTYLE_RULE_IID \
|
|
{ 0xf75f3f70, 0x435d, 0x43a6, \
|
|
{ 0xa0, 0x1b, 0x65, 0x97, 0x04, 0x89, 0xca, 0x26 } }
|
|
|
|
/**
|
|
* An object implementing |nsIStyleRule| (henceforth, a rule) represents
|
|
* immutable stylistic information that either applies or does not apply
|
|
* to a given element. It belongs to an object or group of objects that
|
|
* implement |nsIStyleSheet| and |nsIStyleRuleProcessor| (henceforth, a
|
|
* sheet).
|
|
*
|
|
* A rule becomes relevant to the computation of style data when
|
|
* |nsIStyleRuleProcessor::RulesMatching| creates a rule node that
|
|
* points to the rule. (A rule node, |nsRuleNode|, is a node in the
|
|
* rule tree, which is a lexicographic tree indexed by rules. The path
|
|
* from the root of the rule tree to the |nsRuleNode| for a given
|
|
* |nsStyleContext| contains exactly the rules that match the element
|
|
* that the style context is for, in priority (weight, origin,
|
|
* specificity) order.)
|
|
*
|
|
* The computation of style data uses the rule tree, which calls
|
|
* |nsIStyleRule::MapRuleInfoInto| below.
|
|
*
|
|
* It is worth emphasizing that the data represented by a rule
|
|
* implementation are immutable. When the data need to be changed, a
|
|
* new rule object must be created. Failing to do this will lead to
|
|
* bugs in the handling of dynamic style changes, since the rule tree
|
|
* caches the results of |MapRuleInfoInto|.
|
|
*
|
|
* |nsIStyleRule| objects are owned by |nsRuleNode| objects (in addition
|
|
* to typically being owned by their sheet), which are in turn garbage
|
|
* collected (with the garbage collection roots being style contexts).
|
|
*/
|
|
|
|
|
|
class nsIStyleRule : public nsISupports {
|
|
public:
|
|
NS_DECLARE_STATIC_IID_ACCESSOR(NS_ISTYLE_RULE_IID)
|
|
|
|
/**
|
|
* |nsIStyleRule::MapRuleInfoInto| is a request to copy all stylistic
|
|
* data represented by the rule that:
|
|
* + are relevant for any structs in |aRuleData->mSIDs| (style
|
|
* struct ID bits)
|
|
* + are not already filled into the data struct
|
|
* into the appropriate data struct in |aRuleData|. It is important
|
|
* that only empty data are filled in, since the rule tree is walked
|
|
* from highest priority rule to least, so that the walk can stop if
|
|
* all needed data are found. Thus overwriting non-empty data will
|
|
* break CSS cascading rules.
|
|
*/
|
|
virtual void MapRuleInfoInto(nsRuleData* aRuleData)=0;
|
|
|
|
/**
|
|
* Returns whether this style rule has any style data for inherited
|
|
* properties.
|
|
*/
|
|
virtual bool MightMapInheritedStyleData() = 0;
|
|
|
|
/**
|
|
* Gets and sets given aProperty's value to aValue.
|
|
* Returns true, if aValue is filled in this rule.
|
|
*/
|
|
virtual bool GetDiscretelyAnimatedCSSValue(nsCSSPropertyID aProperty,
|
|
nsCSSValue* aValue) = 0;
|
|
|
|
#ifdef DEBUG
|
|
virtual void List(FILE* out = stdout, int32_t aIndent = 0) const = 0;
|
|
#endif
|
|
};
|
|
|
|
NS_DEFINE_STATIC_IID_ACCESSOR(nsIStyleRule, NS_ISTYLE_RULE_IID)
|
|
|
|
#endif /* nsIStyleRule_h___ */
|