1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/layout/generic/nsPageContentFrame.cpp Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,118 @@
1.4 +/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
1.5 +/* This Source Code Form is subject to the terms of the Mozilla Public
1.6 + * License, v. 2.0. If a copy of the MPL was not distributed with this
1.7 + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
1.8 +#include "nsPageContentFrame.h"
1.9 +#include "nsCSSFrameConstructor.h"
1.10 +#include "nsPresContext.h"
1.11 +#include "nsGkAtoms.h"
1.12 +#include "nsIPresShell.h"
1.13 +#include "nsSimplePageSequenceFrame.h"
1.14 +
1.15 +nsIFrame*
1.16 +NS_NewPageContentFrame(nsIPresShell* aPresShell, nsStyleContext* aContext)
1.17 +{
1.18 + return new (aPresShell) nsPageContentFrame(aContext);
1.19 +}
1.20 +
1.21 +NS_IMPL_FRAMEARENA_HELPERS(nsPageContentFrame)
1.22 +
1.23 +nsresult
1.24 +nsPageContentFrame::Reflow(nsPresContext* aPresContext,
1.25 + nsHTMLReflowMetrics& aDesiredSize,
1.26 + const nsHTMLReflowState& aReflowState,
1.27 + nsReflowStatus& aStatus)
1.28 +{
1.29 + DO_GLOBAL_REFLOW_COUNT("nsPageContentFrame");
1.30 + DISPLAY_REFLOW(aPresContext, this, aReflowState, aDesiredSize, aStatus);
1.31 + aStatus = NS_FRAME_COMPLETE; // initialize out parameter
1.32 + nsresult rv = NS_OK;
1.33 +
1.34 + if (GetPrevInFlow() && (GetStateBits() & NS_FRAME_FIRST_REFLOW)) {
1.35 + nsresult rv = aPresContext->PresShell()->FrameConstructor()
1.36 + ->ReplicateFixedFrames(this);
1.37 + NS_ENSURE_SUCCESS(rv, rv);
1.38 + }
1.39 +
1.40 + // Set our size up front, since some parts of reflow depend on it
1.41 + // being already set. Note that the computed height may be
1.42 + // unconstrained; that's ok. Consumers should watch out for that.
1.43 + nsSize maxSize(aReflowState.ComputedWidth(),
1.44 + aReflowState.ComputedHeight());
1.45 + SetSize(maxSize);
1.46 +
1.47 + // A PageContentFrame must always have one child: the canvas frame.
1.48 + // Resize our frame allowing it only to be as big as we are
1.49 + // XXX Pay attention to the page's border and padding...
1.50 + if (mFrames.NotEmpty()) {
1.51 + nsIFrame* frame = mFrames.FirstChild();
1.52 + nsHTMLReflowState kidReflowState(aPresContext, aReflowState, frame, maxSize);
1.53 + kidReflowState.SetComputedHeight(maxSize.height);
1.54 +
1.55 + // Reflow the page content area
1.56 + rv = ReflowChild(frame, aPresContext, aDesiredSize, kidReflowState, 0, 0, 0, aStatus);
1.57 + NS_ENSURE_SUCCESS(rv, rv);
1.58 +
1.59 + // The document element's background should cover the entire canvas, so
1.60 + // take into account the combined area and any space taken up by
1.61 + // absolutely positioned elements
1.62 + nsMargin padding(0,0,0,0);
1.63 +
1.64 + // XXXbz this screws up percentage padding (sets padding to zero
1.65 + // in the percentage padding case)
1.66 + kidReflowState.mStylePadding->GetPadding(padding);
1.67 +
1.68 + // This is for shrink-to-fit, and therefore we want to use the
1.69 + // scrollable overflow, since the purpose of shrink to fit is to
1.70 + // make the content that ought to be reachable (represented by the
1.71 + // scrollable overflow) fit in the page.
1.72 + if (frame->HasOverflowAreas()) {
1.73 + // The background covers the content area and padding area, so check
1.74 + // for children sticking outside the child frame's padding edge
1.75 + nscoord xmost = aDesiredSize.ScrollableOverflow().XMost();
1.76 + if (xmost > aDesiredSize.Width()) {
1.77 + nscoord widthToFit = xmost + padding.right +
1.78 + kidReflowState.mStyleBorder->GetComputedBorderWidth(NS_SIDE_RIGHT);
1.79 + float ratio = float(maxSize.width) / widthToFit;
1.80 + NS_ASSERTION(ratio >= 0.0 && ratio < 1.0, "invalid shrink-to-fit ratio");
1.81 + mPD->mShrinkToFitRatio = std::min(mPD->mShrinkToFitRatio, ratio);
1.82 + }
1.83 + }
1.84 +
1.85 + // Place and size the child
1.86 + FinishReflowChild(frame, aPresContext, aDesiredSize, &kidReflowState, 0, 0, 0);
1.87 +
1.88 + NS_ASSERTION(aPresContext->IsDynamic() || !NS_FRAME_IS_FULLY_COMPLETE(aStatus) ||
1.89 + !frame->GetNextInFlow(), "bad child flow list");
1.90 + }
1.91 +
1.92 + // Reflow our fixed frames
1.93 + nsReflowStatus fixedStatus = NS_FRAME_COMPLETE;
1.94 + ReflowAbsoluteFrames(aPresContext, aDesiredSize, aReflowState, fixedStatus);
1.95 + NS_ASSERTION(NS_FRAME_IS_COMPLETE(fixedStatus), "fixed frames can be truncated, but not incomplete");
1.96 +
1.97 + // Return our desired size
1.98 + aDesiredSize.Width() = aReflowState.ComputedWidth();
1.99 + if (aReflowState.ComputedHeight() != NS_UNCONSTRAINEDSIZE) {
1.100 + aDesiredSize.Height() = aReflowState.ComputedHeight();
1.101 + }
1.102 +
1.103 + FinishAndStoreOverflow(&aDesiredSize);
1.104 +
1.105 + NS_FRAME_SET_TRUNCATION(aStatus, aReflowState, aDesiredSize);
1.106 + return NS_OK;
1.107 +}
1.108 +
1.109 +nsIAtom*
1.110 +nsPageContentFrame::GetType() const
1.111 +{
1.112 + return nsGkAtoms::pageContentFrame;
1.113 +}
1.114 +
1.115 +#ifdef DEBUG_FRAME_DUMP
1.116 +nsresult
1.117 +nsPageContentFrame::GetFrameName(nsAString& aResult) const
1.118 +{
1.119 + return MakeFrameName(NS_LITERAL_STRING("PageContent"), aResult);
1.120 +}
1.121 +#endif
