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https://github.com/mozilla/gecko-dev.git
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c0f2f96f66
This is mostly code removal, changing GetDisplayContentsStyle(..) checks by an FFI call to Servo. The tricky parts are: * MaybeCreateLazily, which I fixed to avoid setting bits under display: none stuff. This was a pre-existing problem, which was wallpapered by the sc->IsInDisplayNoneSubtree() check, which effectively made the whole assertion useless (see bug 1381017 for the only crashtest that hit this though). * ContentRemoved, where we can no longer know for sure whether the element is actually display: contents if we're removing it as a response to a style change. See the comment there. That kinda sucks, but that case is relatively weird, and it's better than adding tons of complexity to handle that. * GetParentComputedStyle, which also has a comment there. Also, this function has only one caller now, so we should maybe try to remove it. The different assertions after DestroyFramesForAndRestyle are changed for a single assertion in the function itself, and the node bit used as an optimization to avoid hashtable lookups is taken back. MozReview-Commit-ID: AZm822QnhF9
281 lines
8.7 KiB
C++
281 lines
8.7 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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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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/* storage of the frame tree and information about it */
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#include "nsFrameManager.h"
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#include "nscore.h"
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#include "nsIPresShell.h"
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#include "nsCOMPtr.h"
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#include "plhash.h"
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#include "nsPlaceholderFrame.h"
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#include "nsGkAtoms.h"
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#include "nsILayoutHistoryState.h"
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#include "nsPresState.h"
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#include "mozilla/ComputedStyle.h"
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#include "mozilla/dom/Element.h"
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#include "mozilla/UndisplayedNode.h"
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#include "nsIDocument.h"
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#include "nsContentUtils.h"
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#include "nsError.h"
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#include "nsAutoPtr.h"
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#include "nsAbsoluteContainingBlock.h"
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#include "ChildIterator.h"
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#include "GeckoProfiler.h"
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#include "nsIStatefulFrame.h"
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#include "nsContainerFrame.h"
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#include "nsWindowSizes.h"
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#include "mozilla/MemoryReporting.h"
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// #define DEBUG_UNDISPLAYED_MAP
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// #define DEBUG_DISPLAY_CONTENTS_MAP
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using namespace mozilla;
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using namespace mozilla::dom;
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//----------------------------------------------------------------------
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nsFrameManager::~nsFrameManager()
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{
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NS_ASSERTION(!mPresShell, "nsFrameManager::Destroy never called");
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}
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void
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nsFrameManager::Destroy()
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{
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NS_ASSERTION(mPresShell, "Frame manager already shut down.");
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// Destroy the frame hierarchy.
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mPresShell->SetIgnoreFrameDestruction(true);
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if (mRootFrame) {
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mRootFrame->Destroy();
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mRootFrame = nullptr;
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}
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mPresShell = nullptr;
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}
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//----------------------------------------------------------------------
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void
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nsFrameManager::AppendFrames(nsContainerFrame* aParentFrame,
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ChildListID aListID,
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nsFrameList& aFrameList)
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{
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if (aParentFrame->IsAbsoluteContainer() &&
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aListID == aParentFrame->GetAbsoluteListID()) {
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aParentFrame->GetAbsoluteContainingBlock()->
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AppendFrames(aParentFrame, aListID, aFrameList);
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} else {
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aParentFrame->AppendFrames(aListID, aFrameList);
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}
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}
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void
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nsFrameManager::InsertFrames(nsContainerFrame* aParentFrame,
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ChildListID aListID,
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nsIFrame* aPrevFrame,
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nsFrameList& aFrameList)
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{
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NS_PRECONDITION(!aPrevFrame || (!aPrevFrame->GetNextContinuation()
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|| (((aPrevFrame->GetNextContinuation()->GetStateBits() & NS_FRAME_IS_OVERFLOW_CONTAINER))
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&& !(aPrevFrame->GetStateBits() & NS_FRAME_IS_OVERFLOW_CONTAINER))),
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"aPrevFrame must be the last continuation in its chain!");
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if (aParentFrame->IsAbsoluteContainer() &&
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aListID == aParentFrame->GetAbsoluteListID()) {
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aParentFrame->GetAbsoluteContainingBlock()->
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InsertFrames(aParentFrame, aListID, aPrevFrame, aFrameList);
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} else {
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aParentFrame->InsertFrames(aListID, aPrevFrame, aFrameList);
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}
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}
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void
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nsFrameManager::RemoveFrame(ChildListID aListID,
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nsIFrame* aOldFrame)
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{
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bool wasDestroyingFrames = mIsDestroyingFrames;
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mIsDestroyingFrames = true;
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// In case the reflow doesn't invalidate anything since it just leaves
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// a gap where the old frame was, we invalidate it here. (This is
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// reasonably likely to happen when removing a last child in a way
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// that doesn't change the size of the parent.)
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// This has to sure to invalidate the entire overflow rect; this
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// is important in the presence of absolute positioning
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aOldFrame->InvalidateFrameForRemoval();
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NS_ASSERTION(!aOldFrame->GetPrevContinuation() ||
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// exception for nsCSSFrameConstructor::RemoveFloatingFirstLetterFrames
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aOldFrame->IsTextFrame(),
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"Must remove first continuation.");
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NS_ASSERTION(!(aOldFrame->GetStateBits() & NS_FRAME_OUT_OF_FLOW &&
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aOldFrame->GetPlaceholderFrame()),
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"Must call RemoveFrame on placeholder for out-of-flows.");
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nsContainerFrame* parentFrame = aOldFrame->GetParent();
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if (parentFrame->IsAbsoluteContainer() &&
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aListID == parentFrame->GetAbsoluteListID()) {
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parentFrame->GetAbsoluteContainingBlock()->
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RemoveFrame(parentFrame, aListID, aOldFrame);
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} else {
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parentFrame->RemoveFrame(aListID, aOldFrame);
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}
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mIsDestroyingFrames = wasDestroyingFrames;
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}
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//----------------------------------------------------------------------
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// Capture state for a given frame.
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// Accept a content id here, in some cases we may not have content (scroll position)
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void
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nsFrameManager::CaptureFrameStateFor(nsIFrame* aFrame,
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nsILayoutHistoryState* aState)
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{
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if (!aFrame || !aState) {
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NS_WARNING("null frame, or state");
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return;
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}
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// Only capture state for stateful frames
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nsIStatefulFrame* statefulFrame = do_QueryFrame(aFrame);
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if (!statefulFrame) {
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return;
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}
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// Capture the state, exit early if we get null (nothing to save)
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nsAutoPtr<nsPresState> frameState;
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nsresult rv = statefulFrame->SaveState(getter_Transfers(frameState));
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if (!frameState) {
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return;
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}
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// Generate the hash key to store the state under
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// Exit early if we get empty key
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nsAutoCString stateKey;
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nsIContent* content = aFrame->GetContent();
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nsIDocument* doc = content ? content->GetUncomposedDoc() : nullptr;
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rv = statefulFrame->GenerateStateKey(content, doc, stateKey);
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if(NS_FAILED(rv) || stateKey.IsEmpty()) {
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return;
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}
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// Store the state. aState owns frameState now.
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aState->AddState(stateKey, frameState.forget());
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}
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void
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nsFrameManager::CaptureFrameState(nsIFrame* aFrame,
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nsILayoutHistoryState* aState)
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{
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NS_PRECONDITION(nullptr != aFrame && nullptr != aState, "null parameters passed in");
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CaptureFrameStateFor(aFrame, aState);
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// Now capture state recursively for the frame hierarchy rooted at aFrame
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nsIFrame::ChildListIterator lists(aFrame);
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for (; !lists.IsDone(); lists.Next()) {
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nsFrameList::Enumerator childFrames(lists.CurrentList());
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for (; !childFrames.AtEnd(); childFrames.Next()) {
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nsIFrame* child = childFrames.get();
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if (child->GetStateBits() & NS_FRAME_OUT_OF_FLOW) {
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// We'll pick it up when we get to its placeholder
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continue;
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}
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// Make sure to walk through placeholders as needed, so that we
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// save state for out-of-flows which may not be our descendants
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// themselves but whose placeholders are our descendants.
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CaptureFrameState(nsPlaceholderFrame::GetRealFrameFor(child), aState);
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}
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}
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}
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// Restore state for a given frame.
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// Accept a content id here, in some cases we may not have content (scroll position)
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void
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nsFrameManager::RestoreFrameStateFor(nsIFrame* aFrame,
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nsILayoutHistoryState* aState)
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{
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if (!aFrame || !aState) {
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NS_WARNING("null frame or state");
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return;
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}
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// Only restore state for stateful frames
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nsIStatefulFrame* statefulFrame = do_QueryFrame(aFrame);
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if (!statefulFrame) {
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return;
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}
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// Generate the hash key the state was stored under
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// Exit early if we get empty key
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nsIContent* content = aFrame->GetContent();
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// If we don't have content, we can't generate a hash
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// key and there's probably no state information for us.
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if (!content) {
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return;
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}
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nsAutoCString stateKey;
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nsIDocument* doc = content->GetUncomposedDoc();
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nsresult rv = statefulFrame->GenerateStateKey(content, doc, stateKey);
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if (NS_FAILED(rv) || stateKey.IsEmpty()) {
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return;
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}
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// Get the state from the hash
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nsPresState* frameState = aState->GetState(stateKey);
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if (!frameState) {
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return;
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}
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// Restore it
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rv = statefulFrame->RestoreState(frameState);
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if (NS_FAILED(rv)) {
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return;
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}
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// If we restore ok, remove the state from the state table
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aState->RemoveState(stateKey);
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}
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void
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nsFrameManager::RestoreFrameState(nsIFrame* aFrame,
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nsILayoutHistoryState* aState)
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{
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NS_PRECONDITION(nullptr != aFrame && nullptr != aState, "null parameters passed in");
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RestoreFrameStateFor(aFrame, aState);
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// Now restore state recursively for the frame hierarchy rooted at aFrame
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nsIFrame::ChildListIterator lists(aFrame);
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for (; !lists.IsDone(); lists.Next()) {
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nsFrameList::Enumerator childFrames(lists.CurrentList());
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for (; !childFrames.AtEnd(); childFrames.Next()) {
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RestoreFrameState(childFrames.get(), aState);
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}
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}
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}
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void
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nsFrameManager::DestroyAnonymousContent(already_AddRefed<nsIContent> aContent)
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{
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if (nsCOMPtr<nsIContent> content = aContent) {
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content->UnbindFromTree();
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}
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}
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void
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nsFrameManager::AddSizeOfIncludingThis(nsWindowSizes& aSizes) const
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{
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aSizes.mLayoutPresShellSize += aSizes.mState.mMallocSizeOf(this);
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}
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