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2e869d8f3d
nsReflowStatus::IsEmpty() assertions are added after DISPLAY_REFLOW in the beginning of the Reflow(). A few Reflow() implementations have Reset() calls at the end which are left in place by this patch (with an explanatory comment added to each). These ending Reset()s are only needed for cases where a non-splittable frame passes its own nsReflowStatus to a child's reflow method. Just in case the child leaves a "not fully complete" value in the nsReflowStatus, the non-splittable parent frame must clear out the nsReflowStatus before returning, so that its own parent doesn't then try to split it. MozReview-Commit-ID: 6Jj3jfMAqj4 --HG-- extra : rebase_source : e1fe6a775ad97e16a6d7cc224634ff962ccb0fbf
127 lines
4.8 KiB
C++
127 lines
4.8 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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#include "nsPageContentFrame.h"
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#include "nsCSSFrameConstructor.h"
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#include "nsPresContext.h"
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#include "nsGkAtoms.h"
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#include "nsIPresShell.h"
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#include "nsSimplePageSequenceFrame.h"
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using namespace mozilla;
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nsPageContentFrame*
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NS_NewPageContentFrame(nsIPresShell* aPresShell, nsStyleContext* aContext)
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{
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return new (aPresShell) nsPageContentFrame(aContext);
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}
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NS_IMPL_FRAMEARENA_HELPERS(nsPageContentFrame)
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void
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nsPageContentFrame::Reflow(nsPresContext* aPresContext,
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ReflowOutput& aDesiredSize,
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const ReflowInput& aReflowInput,
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nsReflowStatus& aStatus)
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{
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MarkInReflow();
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DO_GLOBAL_REFLOW_COUNT("nsPageContentFrame");
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DISPLAY_REFLOW(aPresContext, this, aReflowInput, aDesiredSize, aStatus);
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MOZ_ASSERT(aStatus.IsEmpty(), "Caller should pass a fresh reflow status!");
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if (GetPrevInFlow() && (GetStateBits() & NS_FRAME_FIRST_REFLOW)) {
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nsresult rv = aPresContext->PresShell()->FrameConstructor()
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->ReplicateFixedFrames(this);
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if (NS_FAILED(rv)) {
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return;
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}
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}
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// Set our size up front, since some parts of reflow depend on it
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// being already set. Note that the computed height may be
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// unconstrained; that's ok. Consumers should watch out for that.
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nsSize maxSize(aReflowInput.ComputedWidth(),
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aReflowInput.ComputedHeight());
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SetSize(maxSize);
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// A PageContentFrame must always have one child: the canvas frame.
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// Resize our frame allowing it only to be as big as we are
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// XXX Pay attention to the page's border and padding...
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if (mFrames.NotEmpty()) {
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nsIFrame* frame = mFrames.FirstChild();
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WritingMode wm = frame->GetWritingMode();
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LogicalSize logicalSize(wm, maxSize);
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ReflowInput kidReflowInput(aPresContext, aReflowInput,
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frame, logicalSize);
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kidReflowInput.SetComputedBSize(logicalSize.BSize(wm));
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// Reflow the page content area
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ReflowChild(frame, aPresContext, aDesiredSize, kidReflowInput, 0, 0, 0, aStatus);
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// The document element's background should cover the entire canvas, so
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// take into account the combined area and any space taken up by
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// absolutely positioned elements
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nsMargin padding(0,0,0,0);
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// XXXbz this screws up percentage padding (sets padding to zero
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// in the percentage padding case)
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kidReflowInput.mStylePadding->GetPadding(padding);
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// This is for shrink-to-fit, and therefore we want to use the
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// scrollable overflow, since the purpose of shrink to fit is to
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// make the content that ought to be reachable (represented by the
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// scrollable overflow) fit in the page.
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if (frame->HasOverflowAreas()) {
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// The background covers the content area and padding area, so check
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// for children sticking outside the child frame's padding edge
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nscoord xmost = aDesiredSize.ScrollableOverflow().XMost();
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if (xmost > aDesiredSize.Width()) {
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nscoord widthToFit = xmost + padding.right +
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kidReflowInput.mStyleBorder->GetComputedBorderWidth(eSideRight);
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float ratio = float(maxSize.width) / widthToFit;
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NS_ASSERTION(ratio >= 0.0 && ratio < 1.0, "invalid shrink-to-fit ratio");
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mPD->mShrinkToFitRatio = std::min(mPD->mShrinkToFitRatio, ratio);
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}
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}
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// Place and size the child
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FinishReflowChild(frame, aPresContext, aDesiredSize, &kidReflowInput, 0, 0, 0);
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NS_ASSERTION(aPresContext->IsDynamic() || !aStatus.IsFullyComplete() ||
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!frame->GetNextInFlow(), "bad child flow list");
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}
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// Reflow our fixed frames
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nsReflowStatus fixedStatus;
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ReflowAbsoluteFrames(aPresContext, aDesiredSize, aReflowInput, fixedStatus);
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NS_ASSERTION(fixedStatus.IsComplete(), "fixed frames can be truncated, but not incomplete");
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// Return our desired size
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WritingMode wm = aReflowInput.GetWritingMode();
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aDesiredSize.ISize(wm) = aReflowInput.ComputedISize();
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if (aReflowInput.ComputedBSize() != NS_UNCONSTRAINEDSIZE) {
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aDesiredSize.BSize(wm) = aReflowInput.ComputedBSize();
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}
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FinishAndStoreOverflow(&aDesiredSize);
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NS_FRAME_SET_TRUNCATION(aStatus, aReflowInput, aDesiredSize);
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}
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void
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nsPageContentFrame::AppendDirectlyOwnedAnonBoxes(
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nsTArray<OwnedAnonBox>& aResult)
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{
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MOZ_ASSERT(mFrames.FirstChild(),
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"pageContentFrame must have a canvasFrame child");
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aResult.AppendElement(mFrames.FirstChild());
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}
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#ifdef DEBUG_FRAME_DUMP
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nsresult
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nsPageContentFrame::GetFrameName(nsAString& aResult) const
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{
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return MakeFrameName(NS_LITERAL_STRING("PageContent"), aResult);
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}
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#endif
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