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

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

layout/generic/nsFirstLetterFrame.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/. */
 /* rendering object for CSS :first-letter pseudo-element */
 #include "nsFirstLetterFrame.h"
 #include "nsPresContext.h"
 #include "nsStyleContext.h"
 #include "nsIContent.h"
 #include "nsLineLayout.h"
 #include "nsGkAtoms.h"
 #include "nsAutoPtr.h"
 #include "nsStyleSet.h"
 #include "nsFrameManager.h"
 #include "RestyleManager.h"
 #include "nsPlaceholderFrame.h"
 #include "nsCSSFrameConstructor.h"
 using namespace mozilla;
 using namespace mozilla::layout;
 nsIFrame*
 NS_NewFirstLetterFrame(nsIPresShell* aPresShell, nsStyleContext* aContext)
 {
   return new (aPresShell) nsFirstLetterFrame(aContext);
 }
 NS_IMPL_FRAMEARENA_HELPERS(nsFirstLetterFrame)
 NS_QUERYFRAME_HEAD(nsFirstLetterFrame)
   NS_QUERYFRAME_ENTRY(nsFirstLetterFrame)
 NS_QUERYFRAME_TAIL_INHERITING(nsContainerFrame)
 #ifdef DEBUG_FRAME_DUMP
 nsresult
 nsFirstLetterFrame::GetFrameName(nsAString& aResult) const
 {
   return MakeFrameName(NS_LITERAL_STRING("Letter"), aResult);
 }
 #endif
 nsIAtom*
 nsFirstLetterFrame::GetType() const
 {
   return nsGkAtoms::letterFrame;
 }
 void
 nsFirstLetterFrame::BuildDisplayList(nsDisplayListBuilder*   aBuilder,
                                      const nsRect&           aDirtyRect,
                                      const nsDisplayListSet& aLists)
 {
   BuildDisplayListForInline(aBuilder, aDirtyRect, aLists);
 }
 void
 nsFirstLetterFrame::Init(nsIContent*      aContent,
                          nsIFrame*        aParent,
                          nsIFrame*        aPrevInFlow)
 {
   nsRefPtr<nsStyleContext> newSC;
   if (aPrevInFlow) {
     // Get proper style context for ourselves.  We're creating the frame
     // that represents everything *except* the first letter, so just create
     // a style context like we would for a text node.
     nsStyleContext* parentStyleContext = mStyleContext->GetParent();
     if (parentStyleContext) {
       newSC = PresContext()->StyleSet()->
         ResolveStyleForNonElement(parentStyleContext);
       SetStyleContextWithoutNotification(newSC);
     }
   }
   nsContainerFrame::Init(aContent, aParent, aPrevInFlow);
 }
 nsresult
 nsFirstLetterFrame::SetInitialChildList(ChildListID  aListID,
                                         nsFrameList& aChildList)
 {
   RestyleManager* restyleManager = PresContext()->RestyleManager();
   for (nsFrameList::Enumerator e(aChildList); !e.AtEnd(); e.Next()) {
     NS_ASSERTION(e.get()->GetParent() == this, "Unexpected parent");
     restyleManager->ReparentStyleContext(e.get());
     nsLayoutUtils::MarkDescendantsDirty(e.get());
   }
   mFrames.SetFrames(aChildList);
   return NS_OK;
 }
 nsresult
 nsFirstLetterFrame::GetChildFrameContainingOffset(int32_t inContentOffset,
                                                   bool inHint,
                                                   int32_t* outFrameContentOffset,
                                                   nsIFrame **outChildFrame)
 {
   nsIFrame *kid = mFrames.FirstChild();
   if (kid)
   {
     return kid->GetChildFrameContainingOffset(inContentOffset, inHint, outFrameContentOffset, outChildFrame);
   }
   else
     return nsFrame::GetChildFrameContainingOffset(inContentOffset, inHint, outFrameContentOffset, outChildFrame);
 }
 // Needed for non-floating first-letter frames and for the continuations
 // following the first-letter that we also use nsFirstLetterFrame for.
 /* virtual */ void
 nsFirstLetterFrame::AddInlineMinWidth(nsRenderingContext *aRenderingContext,
                                       nsIFrame::InlineMinWidthData *aData)
 {
   DoInlineIntrinsicWidth(aRenderingContext, aData, nsLayoutUtils::MIN_WIDTH);
 }
 // Needed for non-floating first-letter frames and for the continuations
 // following the first-letter that we also use nsFirstLetterFrame for.
 /* virtual */ void
 nsFirstLetterFrame::AddInlinePrefWidth(nsRenderingContext *aRenderingContext,
                                        nsIFrame::InlinePrefWidthData *aData)
 {
   DoInlineIntrinsicWidth(aRenderingContext, aData, nsLayoutUtils::PREF_WIDTH);
 }
 // Needed for floating first-letter frames.
 /* virtual */ nscoord
 nsFirstLetterFrame::GetMinWidth(nsRenderingContext *aRenderingContext)
 {
   return nsLayoutUtils::MinWidthFromInline(this, aRenderingContext);
 }
 // Needed for floating first-letter frames.
 /* virtual */ nscoord
 nsFirstLetterFrame::GetPrefWidth(nsRenderingContext *aRenderingContext)
 {
   return nsLayoutUtils::PrefWidthFromInline(this, aRenderingContext);
 }
 /* virtual */ nsSize
 nsFirstLetterFrame::ComputeSize(nsRenderingContext *aRenderingContext,
                                 nsSize aCBSize, nscoord aAvailableWidth,
                                 nsSize aMargin, nsSize aBorder, nsSize aPadding,
                                 uint32_t aFlags)
 {
   if (GetPrevInFlow()) {
     // We're wrapping the text *after* the first letter, so behave like an
     // inline frame.
     return nsSize(NS_UNCONSTRAINEDSIZE, NS_UNCONSTRAINEDSIZE);
   }
   return nsContainerFrame::ComputeSize(aRenderingContext,
       aCBSize, aAvailableWidth, aMargin, aBorder, aPadding, aFlags);
 }
 nsresult
 nsFirstLetterFrame::Reflow(nsPresContext*          aPresContext,
                            nsHTMLReflowMetrics&     aMetrics,
                            const nsHTMLReflowState& aReflowState,
                            nsReflowStatus&          aReflowStatus)
 {
   DO_GLOBAL_REFLOW_COUNT("nsFirstLetterFrame");
   DISPLAY_REFLOW(aPresContext, this, aReflowState, aMetrics, aReflowStatus);
   nsresult rv = NS_OK;
   // Grab overflow list
   DrainOverflowFrames(aPresContext);
   nsIFrame* kid = mFrames.FirstChild();
   // Setup reflow state for our child
   nsSize availSize(aReflowState.AvailableWidth(), aReflowState.AvailableHeight());
   const nsMargin& bp = aReflowState.ComputedPhysicalBorderPadding();
   nscoord lr = bp.left + bp.right;
   nscoord tb = bp.top + bp.bottom;
   NS_ASSERTION(availSize.width != NS_UNCONSTRAINEDSIZE,
                "should no longer use unconstrained widths");
   availSize.width -= lr;
   if (NS_UNCONSTRAINEDSIZE != availSize.height) {
     availSize.height -= tb;
   }
   // Reflow the child
   if (!aReflowState.mLineLayout) {
     // When there is no lineLayout provided, we provide our own. The
     // only time that the first-letter-frame is not reflowing in a
     // line context is when its floating.
     nsHTMLReflowState rs(aPresContext, aReflowState, kid, availSize);
     nsLineLayout ll(aPresContext, nullptr, &aReflowState, nullptr);
     ll.BeginLineReflow(bp.left, bp.top, availSize.width, NS_UNCONSTRAINEDSIZE,
                        false, true,
                        ll.LineContainerFrame()->GetWritingMode(kid),
                        aReflowState.AvailableWidth());
     rs.mLineLayout = &ll;
     ll.SetInFirstLetter(true);
     ll.SetFirstLetterStyleOK(true);
     kid->WillReflow(aPresContext);
     kid->Reflow(aPresContext, aMetrics, rs, aReflowStatus);
     ll.EndLineReflow();
     ll.SetInFirstLetter(false);
     // In the floating first-letter case, we need to set this ourselves;
     // nsLineLayout::BeginSpan will set it in the other case
     mBaseline = aMetrics.TopAscent();
   }
   else {
     // Pretend we are a span and reflow the child frame
     nsLineLayout* ll = aReflowState.mLineLayout;
     bool          pushedFrame;
     ll->SetInFirstLetter(
       mStyleContext->GetPseudo() == nsCSSPseudoElements::firstLetter);
     ll->BeginSpan(this, &aReflowState, bp.left, availSize.width, &mBaseline);
     ll->ReflowFrame(kid, aReflowStatus, &aMetrics, pushedFrame);
     ll->EndSpan(this);
     ll->SetInFirstLetter(false);
   }
   // Place and size the child and update the output metrics
   kid->SetRect(nsRect(bp.left, bp.top, aMetrics.Width(), aMetrics.Height()));
   kid->FinishAndStoreOverflow(&aMetrics);
   kid->DidReflow(aPresContext, nullptr, nsDidReflowStatus::FINISHED);
   aMetrics.Width() += lr;
   aMetrics.Height() += tb;
   aMetrics.SetTopAscent(aMetrics.TopAscent() + bp.top);
   // Ensure that the overflow rect contains the child textframe's overflow rect.
   // Note that if this is floating, the overline/underline drawable area is in
   // the overflow rect of the child textframe.
   aMetrics.UnionOverflowAreasWithDesiredBounds();
   ConsiderChildOverflow(aMetrics.mOverflowAreas, kid);
   if (!NS_INLINE_IS_BREAK_BEFORE(aReflowStatus)) {
     // Create a continuation or remove existing continuations based on
     // the reflow completion status.
     if (NS_FRAME_IS_COMPLETE(aReflowStatus)) {
       if (aReflowState.mLineLayout) {
         aReflowState.mLineLayout->SetFirstLetterStyleOK(false);
       }
       nsIFrame* kidNextInFlow = kid->GetNextInFlow();
       if (kidNextInFlow) {
         // Remove all of the childs next-in-flows
         static_cast<nsContainerFrame*>(kidNextInFlow->GetParent())
           ->DeleteNextInFlowChild(kidNextInFlow, true);
       }
     }
     else {
       // Create a continuation for the child frame if it doesn't already
       // have one.
       if (!IsFloating()) {
         nsIFrame* nextInFlow;
         rv = CreateNextInFlow(kid, nextInFlow);
         if (NS_FAILED(rv)) {
           return rv;
         }
         // And then push it to our overflow list
         const nsFrameList& overflow = mFrames.RemoveFramesAfter(kid);
         if (overflow.NotEmpty()) {
           SetOverflowFrames(overflow);
         }
       } else if (!kid->GetNextInFlow()) {
         // For floating first letter frames (if a continuation wasn't already
         // created for us) we need to put the continuation with the rest of the
         // text that the first letter frame was made out of.
         nsIFrame* continuation;
         rv = CreateContinuationForFloatingParent(aPresContext, kid,
                                                  &continuation, true);
       }
     }
   }
   FinishAndStoreOverflow(&aMetrics);
   NS_FRAME_SET_TRUNCATION(aReflowStatus, aReflowState, aMetrics);
   return rv;
 }
 /* virtual */ bool
 nsFirstLetterFrame::CanContinueTextRun() const
 {
   // We can continue a text run through a first-letter frame.
   return true;
 }
 nsresult
 nsFirstLetterFrame::CreateContinuationForFloatingParent(nsPresContext* aPresContext,
                                                         nsIFrame* aChild,
                                                         nsIFrame** aContinuation,
                                                         bool aIsFluid)
 {
   NS_ASSERTION(IsFloating(),
                "can only call this on floating first letter frames");
   NS_PRECONDITION(aContinuation, "bad args");
   *aContinuation = nullptr;
   nsresult rv = NS_OK;
   nsIPresShell* presShell = aPresContext->PresShell();
   nsPlaceholderFrame* placeholderFrame =
     presShell->FrameManager()->GetPlaceholderFrameFor(this);
   nsIFrame* parent = placeholderFrame->GetParent();
   nsIFrame* continuation = presShell->FrameConstructor()->
     CreateContinuingFrame(aPresContext, aChild, parent, aIsFluid);
   // The continuation will have gotten the first letter style from its
   // prev continuation, so we need to repair the style context so it
   // doesn't have the first letter styling.
   nsStyleContext* parentSC = this->StyleContext()->GetParent();
   if (parentSC) {
     nsRefPtr<nsStyleContext> newSC;
     newSC = presShell->StyleSet()->ResolveStyleForNonElement(parentSC);
     continuation->SetStyleContext(newSC);
     nsLayoutUtils::MarkDescendantsDirty(continuation);
   }
   //XXX Bidi may not be involved but we have to use the list name
   // kNoReflowPrincipalList because this is just like creating a continuation
   // except we have to insert it in a different place and we don't want a
   // reflow command to try to be issued.
   nsFrameList temp(continuation, continuation);
   rv = parent->InsertFrames(kNoReflowPrincipalList, placeholderFrame, temp);
   *aContinuation = continuation;
   return rv;
 }
 void
 nsFirstLetterFrame::DrainOverflowFrames(nsPresContext* aPresContext)
 {
   // Check for an overflow list with our prev-in-flow
   nsFirstLetterFrame* prevInFlow = (nsFirstLetterFrame*)GetPrevInFlow();
   if (prevInFlow) {
     AutoFrameListPtr overflowFrames(aPresContext,
                                     prevInFlow->StealOverflowFrames());
     if (overflowFrames) {
       NS_ASSERTION(mFrames.IsEmpty(), "bad overflow list");
       // When pushing and pulling frames we need to check for whether any
       // views need to be reparented.
       nsContainerFrame::ReparentFrameViewList(*overflowFrames, prevInFlow,
                                               this);
       mFrames.InsertFrames(this, nullptr, *overflowFrames);
     }
   }
   // It's also possible that we have an overflow list for ourselves
   AutoFrameListPtr overflowFrames(aPresContext, StealOverflowFrames());
   if (overflowFrames) {
     NS_ASSERTION(mFrames.NotEmpty(), "overflow list w/o frames");
     mFrames.AppendFrames(nullptr, *overflowFrames);
   }
   // Now repair our first frames style context (since we only reflow
   // one frame there is no point in doing any other ones until they
   // are reflowed)
   nsIFrame* kid = mFrames.FirstChild();
   if (kid) {
     nsRefPtr<nsStyleContext> sc;
     nsIContent* kidContent = kid->GetContent();
     if (kidContent) {
       NS_ASSERTION(kidContent->IsNodeOfType(nsINode::eTEXT),
                    "should contain only text nodes");
       nsStyleContext* parentSC = prevInFlow ? mStyleContext->GetParent() :
                                               mStyleContext;
       sc = aPresContext->StyleSet()->ResolveStyleForNonElement(parentSC);
       kid->SetStyleContext(sc);
       nsLayoutUtils::MarkDescendantsDirty(kid);
     }
   }
 }
 nscoord
 nsFirstLetterFrame::GetBaseline() const
 {
   return mBaseline;
 }
 int
 nsFirstLetterFrame::GetLogicalSkipSides(const nsHTMLReflowState* aReflowState) const
 {
   if (GetPrevContinuation()) {
     // We shouldn't get calls to GetSkipSides for later continuations since
     // they have separate style contexts with initial values for all the
     // properties that could trigger a call to GetSkipSides.  Then again,
     // it's not really an error to call GetSkipSides on any frame, so
     // that's why we handle it properly.
     return LOGICAL_SIDES_ALL;
   }
   return 0;  // first continuation displays all sides
 }

The Tor Browser / annotate

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

layout/generic/nsFirstLetterFrame.cpp