The Tor Browser: layout/generic/nsSplittableFrame.cpp@b8a032363ba2 (annotated)

layout/generic/nsSplittableFrame.cpp@b8a032363ba2 (annotated)

layout/generic/nsSplittableFrame.cpp

Thu, 22 Jan 2015 13:21:57 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Thu, 22 Jan 2015 13:21:57 +0100
branch: TOR_BUG_9701
changeset 15: b8a032363ba2
permissions: -rw-r--r--

Incorporate requested changes from Mozilla in review:
https://bugzilla.mozilla.org/show_bug.cgi?id=1123480#c6

 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
 /* 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/. */
 /*
  * base class for rendering objects that can be split across lines,
  * columns, or pages
  */
 #include "nsSplittableFrame.h"
 #include "nsContainerFrame.h"
 #include "nsIFrameInlines.h"
 NS_IMPL_FRAMEARENA_HELPERS(nsSplittableFrame)
 void
 nsSplittableFrame::Init(nsIContent*      aContent,
                         nsIFrame*        aParent,
                         nsIFrame*        aPrevInFlow)
 {
   nsFrame::Init(aContent, aParent, aPrevInFlow);
   if (aPrevInFlow) {
     // Hook the frame into the flow
     SetPrevInFlow(aPrevInFlow);
     aPrevInFlow->SetNextInFlow(this);
   }
 }
 void
 nsSplittableFrame::DestroyFrom(nsIFrame* aDestructRoot)
 {
   // Disconnect from the flow list
   if (mPrevContinuation || mNextContinuation) {
     RemoveFromFlow(this);
   }
   // Let the base class destroy the frame
   nsFrame::DestroyFrom(aDestructRoot);
 }
 nsSplittableType
 nsSplittableFrame::GetSplittableType() const
 {
   return NS_FRAME_SPLITTABLE;
 }
 nsIFrame* nsSplittableFrame::GetPrevContinuation() const
 {
   return mPrevContinuation;
 }
 void
 nsSplittableFrame::SetPrevContinuation(nsIFrame* aFrame)
 {
   NS_ASSERTION (!aFrame || GetType() == aFrame->GetType(), "setting a prev continuation with incorrect type!");
   NS_ASSERTION (!IsInPrevContinuationChain(aFrame, this), "creating a loop in continuation chain!");
   mPrevContinuation = aFrame;
   RemoveStateBits(NS_FRAME_IS_FLUID_CONTINUATION);
 }
 nsIFrame* nsSplittableFrame::GetNextContinuation() const
 {
   return mNextContinuation;
 }
 void
 nsSplittableFrame::SetNextContinuation(nsIFrame* aFrame)
 {
   NS_ASSERTION (!aFrame || GetType() == aFrame->GetType(),  "setting a next continuation with incorrect type!");
   NS_ASSERTION (!IsInNextContinuationChain(aFrame, this), "creating a loop in continuation chain!");
   mNextContinuation = aFrame;
   if (aFrame)
     aFrame->RemoveStateBits(NS_FRAME_IS_FLUID_CONTINUATION);
 }
 nsIFrame*
 nsSplittableFrame::FirstContinuation() const
 {
   nsSplittableFrame* firstContinuation = const_cast<nsSplittableFrame*>(this);
   while (firstContinuation->mPrevContinuation)  {
     firstContinuation = static_cast<nsSplittableFrame*>(firstContinuation->mPrevContinuation);
   }
   MOZ_ASSERT(firstContinuation, "post-condition failed");
   return firstContinuation;
 }
 nsIFrame*
 nsSplittableFrame::LastContinuation() const
 {
   nsSplittableFrame* lastContinuation = const_cast<nsSplittableFrame*>(this);
   while (lastContinuation->mNextContinuation)  {
     lastContinuation = static_cast<nsSplittableFrame*>(lastContinuation->mNextContinuation);
   }
   MOZ_ASSERT(lastContinuation, "post-condition failed");
   return lastContinuation;
 }
 #ifdef DEBUG
 bool nsSplittableFrame::IsInPrevContinuationChain(nsIFrame* aFrame1, nsIFrame* aFrame2)
 {
   int32_t iterations = 0;
   while (aFrame1 && iterations < 10) {
     // Bail out after 10 iterations so we don't bog down debug builds too much
     if (aFrame1 == aFrame2)
       return true;
     aFrame1 = aFrame1->GetPrevContinuation();
     ++iterations;
   }
   return false;
 }
 bool nsSplittableFrame::IsInNextContinuationChain(nsIFrame* aFrame1, nsIFrame* aFrame2)
 {
   int32_t iterations = 0;
   while (aFrame1 && iterations < 10) {
     // Bail out after 10 iterations so we don't bog down debug builds too much
     if (aFrame1 == aFrame2)
       return true;
     aFrame1 = aFrame1->GetNextContinuation();
     ++iterations;
   }
   return false;
 }
 #endif
 nsIFrame* nsSplittableFrame::GetPrevInFlow() const
 {
   return (GetStateBits() & NS_FRAME_IS_FLUID_CONTINUATION) ? mPrevContinuation : nullptr;
 }
 void
 nsSplittableFrame::SetPrevInFlow(nsIFrame* aFrame)
 {
   NS_ASSERTION (!aFrame || GetType() == aFrame->GetType(), "setting a prev in flow with incorrect type!");
   NS_ASSERTION (!IsInPrevContinuationChain(aFrame, this), "creating a loop in continuation chain!");
   mPrevContinuation = aFrame;
   AddStateBits(NS_FRAME_IS_FLUID_CONTINUATION);
 }
 nsIFrame* nsSplittableFrame::GetNextInFlow() const
 {
   return mNextContinuation && (mNextContinuation->GetStateBits() & NS_FRAME_IS_FLUID_CONTINUATION) ?
     mNextContinuation : nullptr;
 }
 void
 nsSplittableFrame::SetNextInFlow(nsIFrame* aFrame)
 {
   NS_ASSERTION (!aFrame || GetType() == aFrame->GetType(),  "setting a next in flow with incorrect type!");
   NS_ASSERTION (!IsInNextContinuationChain(aFrame, this), "creating a loop in continuation chain!");
   mNextContinuation = aFrame;
   if (aFrame)
     aFrame->AddStateBits(NS_FRAME_IS_FLUID_CONTINUATION);
 }
 nsIFrame*
 nsSplittableFrame::FirstInFlow() const
 {
   nsSplittableFrame* firstInFlow = const_cast<nsSplittableFrame*>(this);
   while (nsIFrame* prev = firstInFlow->GetPrevInFlow())  {
     firstInFlow = static_cast<nsSplittableFrame*>(prev);
   }
   MOZ_ASSERT(firstInFlow, "post-condition failed");
   return firstInFlow;
 }
 nsIFrame*
 nsSplittableFrame::LastInFlow() const
 {
   nsSplittableFrame* lastInFlow = const_cast<nsSplittableFrame*>(this);
   while (nsIFrame* next = lastInFlow->GetNextInFlow())  {
     lastInFlow = static_cast<nsSplittableFrame*>(next);
   }
   MOZ_ASSERT(lastInFlow, "post-condition failed");
   return lastInFlow;
 }
 // Remove this frame from the flow. Connects prev in flow and next in flow
 void
 nsSplittableFrame::RemoveFromFlow(nsIFrame* aFrame)
 {
   nsIFrame* prevContinuation = aFrame->GetPrevContinuation();
   nsIFrame* nextContinuation = aFrame->GetNextContinuation();
   // The new continuation is fluid only if the continuation on both sides
   // of the removed frame was fluid
   if (aFrame->GetPrevInFlow() && aFrame->GetNextInFlow()) {
     if (prevContinuation) {
       prevContinuation->SetNextInFlow(nextContinuation);
     }
     if (nextContinuation) {
       nextContinuation->SetPrevInFlow(prevContinuation);
     }
   } else {
     if (prevContinuation) {
       prevContinuation->SetNextContinuation(nextContinuation);
     }
     if (nextContinuation) {
       nextContinuation->SetPrevContinuation(prevContinuation);
     }
   }
   aFrame->SetPrevInFlow(nullptr);
   aFrame->SetNextInFlow(nullptr);
 }
 nscoord
 nsSplittableFrame::GetConsumedHeight() const
 {
   nscoord height = 0;
   // Reduce the height by the computed height of prev-in-flows.
   for (nsIFrame* prev = GetPrevInFlow(); prev; prev = prev->GetPrevInFlow()) {
     height += prev->GetRect().height;
   }
   return height;
 }
 nscoord
 nsSplittableFrame::GetEffectiveComputedHeight(const nsHTMLReflowState& aReflowState,
                                               nscoord aConsumedHeight) const
 {
   nscoord height = aReflowState.ComputedHeight();
   if (height == NS_INTRINSICSIZE) {
     return NS_INTRINSICSIZE;
   }
   if (aConsumedHeight == NS_INTRINSICSIZE) {
     aConsumedHeight = GetConsumedHeight();
   }
   height -= aConsumedHeight;
   if (aConsumedHeight != 0 && aConsumedHeight != NS_INTRINSICSIZE) {
     // We just subtracted our top-border padding, since it was included in the
     // first frame's height. Add it back to get the content height.
     height += aReflowState.ComputedPhysicalBorderPadding().top;
   }
   // We may have stretched the frame beyond its computed height. Oh well.
   height = std::max(0, height);
   return height;
 }
 int
 nsSplittableFrame::GetLogicalSkipSides(const nsHTMLReflowState* aReflowState) const
 {
   if (IS_TRUE_OVERFLOW_CONTAINER(this)) {
     return LOGICAL_SIDES_B_BOTH;
   }
   int skip = 0;
   if (GetPrevInFlow()) {
     skip |= LOGICAL_SIDE_B_START;
   }
   if (aReflowState) {
     // We're in the midst of reflow right now, so it's possible that we haven't
     // created a nif yet. If our content height is going to exceed our available
     // height, though, then we're going to need a next-in-flow, it just hasn't
     // been created yet.
     if (NS_UNCONSTRAINEDSIZE != aReflowState->AvailableHeight()) {
       nscoord effectiveCH = this->GetEffectiveComputedHeight(*aReflowState);
       if (effectiveCH > aReflowState->AvailableHeight()) {
         // Our content height is going to exceed our available height, so we're
         // going to need a next-in-flow.
         skip |= LOGICAL_SIDE_B_END;
       }
     }
   } else {
     nsIFrame* nif = GetNextInFlow();
     if (nif && !IS_TRUE_OVERFLOW_CONTAINER(nif)) {
       skip |= LOGICAL_SIDE_B_END;
     }
   }
  return skip;
 }
 #ifdef DEBUG
 void
 nsSplittableFrame::DumpBaseRegressionData(nsPresContext* aPresContext, FILE* out, int32_t aIndent)
 {
   nsFrame::DumpBaseRegressionData(aPresContext, out, aIndent);
   if (nullptr != mNextContinuation) {
     IndentBy(out, aIndent);
     fprintf(out, "<next-continuation va=\"%p\"/>\n", (void*)mNextContinuation);
   }
   if (nullptr != mPrevContinuation) {
     IndentBy(out, aIndent);
     fprintf(out, "<prev-continuation va=\"%p\"/>\n", (void*)mPrevContinuation);
   }
 }
 #endif

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layout/generic/nsSplittableFrame.cpp@b8a032363ba2 (annotated)

layout/generic/nsSplittableFrame.cpp