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Bug 1355351 - Make pseudo-elements return the correct style via getComputedStyle

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* Add a node property to access the ::before and ::after pseudo-elements
* Look for the frame for ::before and ::after pseudos
* Clean up pseudo-element props
* Simplify nsLayoutUtils callers, and make child iterators notice display: contents pseudos

Tag #1375
This commit is contained in:
Matt A. Tobin 2020-04-17 05:10:25 -04:00 • committed by Roy Tam
commit d3ffda520f
16 changed files with 188 additions and 241 deletions
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44
layout/base/nsLayoutUtils.h
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@ -276,50 +276,26 @@ public:
static mozilla::layout::FrameChildListID GetChildListNameFor(nsIFrame* aChildFrame);
/**
* GetBeforeFrameForContent returns the ::before frame for aContent, if
* one exists. This is typically O(1). The frame passed in must be
* the first-in-flow.
*
* @param aGenConParentFrame an ancestor of the ::before frame
* @param aContent the content whose ::before is wanted
* @return the ::before frame or nullptr if there isn't one
* Returns the ::before pseudo-element for aContent, if any.
*/
static nsIFrame* GetBeforeFrameForContent(nsIFrame* aGenConParentFrame,
const nsIContent* aContent);
static mozilla::dom::Element* GetBeforePseudo(const nsIContent* aContent);
/**
* GetBeforeFrame returns the outermost ::before frame of the given frame, if
* one exists. This is typically O(1). The frame passed in must be
* the first-in-flow.
*
* @param aFrame the frame whose ::before is wanted
* @return the :before frame or nullptr if there isn't one
* Returns the frame corresponding to the ::before pseudo-element for
* aContent, if any.
*/
static nsIFrame* GetBeforeFrame(nsIFrame* aFrame);
static nsIFrame* GetBeforeFrame(const nsIContent* aContent);
/**
* GetAfterFrameForContent returns the ::after frame for aContent, if one
* exists. This will walk the in-flow chain of aGenConParentFrame to the
* last-in-flow if needed. This function is typically O(N) in the number
* of child frames, following in-flows, etc.
*
* @param aGenConParentFrame an ancestor of the ::after frame
* @param aContent the content whose ::after is wanted
* @return the ::after frame or nullptr if there isn't one
* Returns the ::after pseudo-element for aContent, if any.
*/
static nsIFrame* GetAfterFrameForContent(nsIFrame* aGenConParentFrame,
const nsIContent* aContent);
static mozilla::dom::Element* GetAfterPseudo(const nsIContent* aContent);
/**
* GetAfterFrame returns the outermost ::after frame of the given frame, if one
* exists. This will walk the in-flow chain to the last-in-flow if
* needed. This function is typically O(N) in the number of child
* frames, following in-flows, etc.
*
* @param aFrame the frame whose ::after is wanted
* @return the :after frame or nullptr if there isn't one
* Returns the frame corresponding to the ::after pseudo-element for aContent,
* if any.
*/
static nsIFrame* GetAfterFrame(nsIFrame* aFrame);
static nsIFrame* GetAfterFrame(const nsIContent* aContent);
/**
* Given a frame, search up the frame tree until we find an