зеркало из https://github.com/mozilla/gecko-dev.git
128 строки
4.9 KiB
C++
128 строки
4.9 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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#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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