mirror of
https://github.com/mozilla/gecko-dev.git
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a7c8d44db9
This moves restyling management out of nsCSSFrameConstructor (thus reducing its size), and keeps the restyling code closer together. This is the first of two big chunks of code moved in this patch series. A later patch in this series will move related code from nsFrameManager into the same destination file.
364 lines
12 KiB
C++
364 lines
12 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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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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* 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_RestyleTracker_h
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#define mozilla_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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#include "nsTPriorityQueue.h"
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#include "mozilla/SplayTree.h"
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namespace mozilla {
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class RestyleManager;
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/**
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* Helper class that collects a list of frames that need
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* UpdateOverflow() called on them, and coalesces them
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* to avoid walking up the same ancestor tree multiple times.
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*/
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class OverflowChangedTracker
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{
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public:
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~OverflowChangedTracker()
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{
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NS_ASSERTION(mEntryList.empty(), "Need to flush before destroying!");
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}
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/**
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* Add a frame that has had a style change, and needs its
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* overflow updated.
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*
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* If there are pre-transform overflow areas stored for this
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* frame, then we will call FinishAndStoreOverflow with those
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* areas instead of UpdateOverflow().
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*
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* If the overflow area changes, then UpdateOverflow will also
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* be called on the parent.
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*/
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void AddFrame(nsIFrame* aFrame) {
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uint32_t depth = aFrame->GetDepthInFrameTree();
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if (mEntryList.empty() ||
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!mEntryList.contains(Entry(aFrame, depth, true))) {
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mEntryList.insert(new Entry(aFrame, depth, true));
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}
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}
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/**
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* Remove a frame.
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*/
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void RemoveFrame(nsIFrame* aFrame) {
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if (mEntryList.empty()) {
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return;
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}
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uint32_t depth = aFrame->GetDepthInFrameTree();
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if (mEntryList.contains(Entry(aFrame, depth, false))) {
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delete mEntryList.remove(Entry(aFrame, depth, false));
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}
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}
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/**
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* Update the overflow of all added frames, and clear the entry list.
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*
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* Start from those deepest in the frame tree and works upwards. This stops
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* us from processing the same frame twice.
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*/
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void Flush() {
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while (!mEntryList.empty()) {
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Entry *entry = mEntryList.removeMin();
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nsIFrame *frame = entry->mFrame;
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bool updateParent = false;
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if (entry->mInitial) {
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nsOverflowAreas* pre = static_cast<nsOverflowAreas*>
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(frame->Properties().Get(frame->PreTransformOverflowAreasProperty()));
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if (pre) {
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// FinishAndStoreOverflow will change the overflow areas passed in,
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// so make a copy.
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nsOverflowAreas overflowAreas = *pre;
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frame->FinishAndStoreOverflow(overflowAreas, frame->GetSize());
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// We can't tell if the overflow changed, so update the parent regardless
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updateParent = true;
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}
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}
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// If the overflow changed, then we want to also update the parent's
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// overflow. We always update the parent for initial frames.
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if (!updateParent) {
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updateParent = frame->UpdateOverflow() || entry->mInitial;
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}
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if (updateParent) {
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nsIFrame *parent = frame->GetParent();
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if (parent) {
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if (!mEntryList.contains(Entry(parent, entry->mDepth - 1, false))) {
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mEntryList.insert(new Entry(parent, entry->mDepth - 1, false));
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}
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}
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}
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delete entry;
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}
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}
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private:
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struct Entry : SplayTreeNode<Entry>
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{
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Entry(nsIFrame* aFrame, bool aInitial)
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: mFrame(aFrame)
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, mDepth(aFrame->GetDepthInFrameTree())
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, mInitial(aInitial)
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{}
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Entry(nsIFrame* aFrame, uint32_t aDepth, bool aInitial)
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: mFrame(aFrame)
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, mDepth(aDepth)
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, mInitial(aInitial)
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{}
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bool operator==(const Entry& aOther) const
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{
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return mFrame == aOther.mFrame;
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}
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/**
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* Sort by *reverse* depth in the tree, and break ties with
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* the frame pointer.
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*/
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bool operator<(const Entry& aOther) const
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{
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if (mDepth == aOther.mDepth) {
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return mFrame < aOther.mFrame;
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}
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return mDepth > aOther.mDepth; /* reverse, want "min" to be deepest */
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}
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static int compare(const Entry& aOne, const Entry& aTwo)
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{
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if (aOne == aTwo) {
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return 0;
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} else if (aOne < aTwo) {
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return -1;
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} else {
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return 1;
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}
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}
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nsIFrame* mFrame;
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/* Depth in the frame tree */
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uint32_t mDepth;
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/**
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* True if the frame had the actual style change, and we
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* want to check for pre-transform overflow areas.
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*/
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bool mInitial;
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};
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/* A list of frames to process, sorted by their depth in the frame tree */
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SplayTree<Entry, Entry> mEntryList;
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};
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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(uint32_t aRestyleBits) :
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mRestyleBits(aRestyleBits),
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mHaveLaterSiblingRestyles(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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void Init(RestyleManager* aRestyleManager) {
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mRestyleManager = aRestyleManager;
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mPendingRestyles.Init();
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}
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uint32_t 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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bool 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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// Fast-path the common case (esp. for the animation restyle
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// tracker) of not having anything to do.
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if (mPendingRestyles.Count()) {
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DoProcessRestyles();
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}
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}
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// Return our ELEMENT_HAS_PENDING_(ANIMATION_)RESTYLE bit
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uint32_t 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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uint32_t 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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bool 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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/**
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* The guts of our restyle processing.
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*/
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void DoProcessRestyles();
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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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uint32_t mRestyleBits;
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RestyleManager* mRestyleManager; // 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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bool mHaveLaterSiblingRestyles;
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};
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inline bool 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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bool 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 mozilla
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#endif /* mozilla_RestyleTracker_h */
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