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239 lines
9.4 KiB
C++
239 lines
9.4 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is mozilla.org code.
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*
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* The Initial Developer of the Original Code is
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* the Mozilla Foundation.
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* Portions created by the Initial Developer are Copyright (C) 2010
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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* Boris Zbarsky <bzbarsky@mit.edu> (original author)
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either the GNU General Public License Version 2 or later (the "GPL"), or
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* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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/**
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* A class which manages pending restyles. This handles keeping track
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* of what nodes restyles need to happen on and so forth.
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*/
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#ifndef mozilla_css_RestyleTracker_h
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#define mozilla_css_RestyleTracker_h
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#include "mozilla/dom/Element.h"
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#include "nsDataHashtable.h"
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#include "nsIFrame.h"
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class nsCSSFrameConstructor;
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namespace mozilla {
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namespace css {
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class RestyleTracker {
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public:
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typedef mozilla::dom::Element Element;
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RestyleTracker(PRUint32 aRestyleBits,
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nsCSSFrameConstructor* aFrameConstructor) :
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mRestyleBits(aRestyleBits), mFrameConstructor(aFrameConstructor),
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mHaveLaterSiblingRestyles(PR_FALSE)
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{
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NS_PRECONDITION((mRestyleBits & ~ELEMENT_ALL_RESTYLE_FLAGS) == 0,
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"Why do we have these bits set?");
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NS_PRECONDITION((mRestyleBits & ELEMENT_PENDING_RESTYLE_FLAGS) != 0,
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"Must have a restyle flag");
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NS_PRECONDITION((mRestyleBits & ELEMENT_PENDING_RESTYLE_FLAGS) !=
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ELEMENT_PENDING_RESTYLE_FLAGS,
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"Shouldn't have both restyle flags set");
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NS_PRECONDITION((mRestyleBits & ~ELEMENT_PENDING_RESTYLE_FLAGS) != 0,
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"Must have root flag");
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NS_PRECONDITION((mRestyleBits & ~ELEMENT_PENDING_RESTYLE_FLAGS) !=
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(ELEMENT_ALL_RESTYLE_FLAGS & ~ELEMENT_PENDING_RESTYLE_FLAGS),
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"Shouldn't have both root flags");
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}
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PRBool Init() {
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return mPendingRestyles.Init();
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}
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PRUint32 Count() const {
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return mPendingRestyles.Count();
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}
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/**
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* Add a restyle for the given element to the tracker. Returns true
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* if the element already had eRestyle_LaterSiblings set on it.
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*/
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PRBool AddPendingRestyle(Element* aElement, nsRestyleHint aRestyleHint,
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nsChangeHint aMinChangeHint);
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/**
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* Process the restyles we've been tracking.
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*/
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void ProcessRestyles();
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// Return our ELEMENT_HAS_PENDING_(ANIMATION_)RESTYLE bit
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PRUint32 RestyleBit() const {
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return mRestyleBits & ELEMENT_PENDING_RESTYLE_FLAGS;
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}
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// Return our ELEMENT_IS_POTENTIAL_(ANIMATION_)RESTYLE_ROOT bit
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PRUint32 RootBit() const {
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return mRestyleBits & ~ELEMENT_PENDING_RESTYLE_FLAGS;
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}
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struct RestyleData {
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nsRestyleHint mRestyleHint; // What we want to restyle
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nsChangeHint mChangeHint; // The minimal change hint for "self"
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};
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/**
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* If the given Element has a restyle pending for it, return the
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* relevant restyle data. This function will clear everything other
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* than a possible eRestyle_LaterSiblings hint for aElement out of
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* our hashtable. The returned aData will never have an
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* eRestyle_LaterSiblings hint in it.
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*
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* The return value indicates whether any restyle data was found for
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* the element. If false is returned, then the state of *aData is
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* undefined.
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*/
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PRBool GetRestyleData(Element* aElement, RestyleData* aData);
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/**
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* The document we're associated with.
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*/
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inline nsIDocument* Document() const;
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struct RestyleEnumerateData : public RestyleData {
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nsRefPtr<Element> mElement;
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};
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private:
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/**
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* Handle a single mPendingRestyles entry. aRestyleHint must not
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* include eRestyle_LaterSiblings; that needs to be dealt with
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* before calling this function.
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*/
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inline void ProcessOneRestyle(Element* aElement,
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nsRestyleHint aRestyleHint,
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nsChangeHint aChangeHint);
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typedef nsDataHashtable<nsISupportsHashKey, RestyleData> PendingRestyleTable;
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typedef nsAutoTArray< nsRefPtr<Element>, 32> RestyleRootArray;
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// Our restyle bits. These will be a subset of ELEMENT_ALL_RESTYLE_FLAGS, and
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// will include one flag from ELEMENT_PENDING_RESTYLE_FLAGS and one flag
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// that's not in ELEMENT_PENDING_RESTYLE_FLAGS.
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PRUint32 mRestyleBits;
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nsCSSFrameConstructor* mFrameConstructor; // Owns us
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// A hashtable that maps elements to RestyleData structs. The
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// values only make sense if the element's current document is our
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// document and it has our RestyleBit() flag set. In particular,
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// said bit might not be set if the element had a restyle posted and
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// then was moved around in the DOM.
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PendingRestyleTable mPendingRestyles;
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// An array that keeps track of our possible restyle roots. This
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// maintains the invariant that if A and B are both restyle roots
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// and A is an ancestor of B then A will come after B in the array.
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// We maintain this invariant by checking whether an element has an
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// ancestor with the restyle root bit set before appending it to the
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// array.
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RestyleRootArray mRestyleRoots;
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// True if we have some entries with the eRestyle_LaterSiblings
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// flag. We need this to avoid enumerating the hashtable looking
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// for such entries when we can't possibly have any.
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PRBool mHaveLaterSiblingRestyles;
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};
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inline PRBool RestyleTracker::AddPendingRestyle(Element* aElement,
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nsRestyleHint aRestyleHint,
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nsChangeHint aMinChangeHint)
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{
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RestyleData existingData;
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existingData.mRestyleHint = nsRestyleHint(0);
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existingData.mChangeHint = NS_STYLE_HINT_NONE;
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// Check the RestyleBit() flag before doing the hashtable Get, since
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// it's possible that the data in the hashtable isn't actually
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// relevant anymore (if the flag is not set).
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if (aElement->HasFlag(RestyleBit())) {
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mPendingRestyles.Get(aElement, &existingData);
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} else {
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aElement->SetFlags(RestyleBit());
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}
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PRBool hadRestyleLaterSiblings =
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(existingData.mRestyleHint & eRestyle_LaterSiblings) != 0;
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existingData.mRestyleHint =
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nsRestyleHint(existingData.mRestyleHint | aRestyleHint);
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NS_UpdateHint(existingData.mChangeHint, aMinChangeHint);
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mPendingRestyles.Put(aElement, existingData);
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// We can only treat this element as a restyle root if we would
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// actually restyle its descendants (so either call
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// ReResolveStyleContext on it or just reframe it).
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if ((aRestyleHint & (eRestyle_Self | eRestyle_Subtree)) ||
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(aMinChangeHint & nsChangeHint_ReconstructFrame)) {
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for (const Element* cur = aElement; !cur->HasFlag(RootBit()); ) {
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nsIContent* parent = cur->GetFlattenedTreeParent();
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// Stop if we have no parent or the parent is not an element or
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// we're part of the viewport scrollbars (because those are not
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// frametree descendants of the primary frame of the root
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// element).
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// XXXbz maybe the primary frame of the root should be the root scrollframe?
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if (!parent || !parent->IsElement() ||
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// If we've hit the root via a native anonymous kid and that
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// this native anonymous kid is not obviously a descendant
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// of the root's primary frame, assume we're under the root
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// scrollbars. Since those don't get reresolved when
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// reresolving the root, we need to make sure to add the
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// element to mRestyleRoots.
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(cur->IsInNativeAnonymousSubtree() && !parent->GetParent() &&
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cur->GetPrimaryFrame() &&
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cur->GetPrimaryFrame()->GetParent() != parent->GetPrimaryFrame())) {
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mRestyleRoots.AppendElement(aElement);
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break;
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}
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cur = parent->AsElement();
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}
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// At this point some ancestor of aElement (possibly aElement
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// itself) is in mRestyleRoots. Set the root bit on aElement, to
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// speed up searching for an existing root on its descendants.
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aElement->SetFlags(RootBit());
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}
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mHaveLaterSiblingRestyles =
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mHaveLaterSiblingRestyles || (aRestyleHint & eRestyle_LaterSiblings) != 0;
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return hadRestyleLaterSiblings;
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}
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} // namespace css
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} // namespace mozilla
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#endif /* mozilla_css_RestyleTracker_h */
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