The Tor Browser: layout/generic/nsPageContentFrame.cpp@6474c204b198

Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.

     1 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */

     2 /* This Source Code Form is subject to the terms of the Mozilla Public

     3  * License, v. 2.0. If a copy of the MPL was not distributed with this

     4  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

     5 #include "nsPageContentFrame.h"

     6 #include "nsCSSFrameConstructor.h"

     7 #include "nsPresContext.h"

     8 #include "nsGkAtoms.h"

     9 #include "nsIPresShell.h"

    10 #include "nsSimplePageSequenceFrame.h"

    12 nsIFrame*

    13 NS_NewPageContentFrame(nsIPresShell* aPresShell, nsStyleContext* aContext)

    14 {

    15   return new (aPresShell) nsPageContentFrame(aContext);

    16 }

    18 NS_IMPL_FRAMEARENA_HELPERS(nsPageContentFrame)

    20 nsresult

    21 nsPageContentFrame::Reflow(nsPresContext*           aPresContext,

    22                            nsHTMLReflowMetrics&     aDesiredSize,

    23                            const nsHTMLReflowState& aReflowState,

    24                            nsReflowStatus&          aStatus)

    25 {

    26   DO_GLOBAL_REFLOW_COUNT("nsPageContentFrame");

    27   DISPLAY_REFLOW(aPresContext, this, aReflowState, aDesiredSize, aStatus);

    28   aStatus = NS_FRAME_COMPLETE;  // initialize out parameter

    29   nsresult rv = NS_OK;

    31   if (GetPrevInFlow() && (GetStateBits() & NS_FRAME_FIRST_REFLOW)) {

    32     nsresult rv = aPresContext->PresShell()->FrameConstructor()

    33                     ->ReplicateFixedFrames(this);

    34     NS_ENSURE_SUCCESS(rv, rv);

    35   }

    37   // Set our size up front, since some parts of reflow depend on it

    38   // being already set.  Note that the computed height may be

    39   // unconstrained; that's ok.  Consumers should watch out for that.

    40   nsSize  maxSize(aReflowState.ComputedWidth(),

    41                   aReflowState.ComputedHeight());

    42   SetSize(maxSize);

    44   // A PageContentFrame must always have one child: the canvas frame.

    45   // Resize our frame allowing it only to be as big as we are

    46   // XXX Pay attention to the page's border and padding...

    47   if (mFrames.NotEmpty()) {

    48     nsIFrame* frame = mFrames.FirstChild();

    49     nsHTMLReflowState kidReflowState(aPresContext, aReflowState, frame, maxSize);

    50     kidReflowState.SetComputedHeight(maxSize.height);

    52     // Reflow the page content area

    53     rv = ReflowChild(frame, aPresContext, aDesiredSize, kidReflowState, 0, 0, 0, aStatus);

    54     NS_ENSURE_SUCCESS(rv, rv);

    56     // The document element's background should cover the entire canvas, so

    57     // take into account the combined area and any space taken up by

    58     // absolutely positioned elements

    59     nsMargin padding(0,0,0,0);

    61     // XXXbz this screws up percentage padding (sets padding to zero

    62     // in the percentage padding case)

    63     kidReflowState.mStylePadding->GetPadding(padding);

    65     // This is for shrink-to-fit, and therefore we want to use the

    66     // scrollable overflow, since the purpose of shrink to fit is to

    67     // make the content that ought to be reachable (represented by the

    68     // scrollable overflow) fit in the page.

    69     if (frame->HasOverflowAreas()) {

    70       // The background covers the content area and padding area, so check

    71       // for children sticking outside the child frame's padding edge

    72       nscoord xmost = aDesiredSize.ScrollableOverflow().XMost();

    73       if (xmost > aDesiredSize.Width()) {

    74         nscoord widthToFit = xmost + padding.right +

    75           kidReflowState.mStyleBorder->GetComputedBorderWidth(NS_SIDE_RIGHT);

    76         float ratio = float(maxSize.width) / widthToFit;

    77         NS_ASSERTION(ratio >= 0.0 && ratio < 1.0, "invalid shrink-to-fit ratio");

    78         mPD->mShrinkToFitRatio = std::min(mPD->mShrinkToFitRatio, ratio);

    79       }

    80     }

    82     // Place and size the child

    83     FinishReflowChild(frame, aPresContext, aDesiredSize, &kidReflowState, 0, 0, 0);

    85     NS_ASSERTION(aPresContext->IsDynamic() || !NS_FRAME_IS_FULLY_COMPLETE(aStatus) ||

    86                   !frame->GetNextInFlow(), "bad child flow list");

    87   }

    89   // Reflow our fixed frames

    90   nsReflowStatus fixedStatus = NS_FRAME_COMPLETE;

    91   ReflowAbsoluteFrames(aPresContext, aDesiredSize, aReflowState, fixedStatus);

    92   NS_ASSERTION(NS_FRAME_IS_COMPLETE(fixedStatus), "fixed frames can be truncated, but not incomplete");

    94   // Return our desired size

    95   aDesiredSize.Width() = aReflowState.ComputedWidth();

    96   if (aReflowState.ComputedHeight() != NS_UNCONSTRAINEDSIZE) {

    97     aDesiredSize.Height() = aReflowState.ComputedHeight();

    98   }

   100   FinishAndStoreOverflow(&aDesiredSize);

   102   NS_FRAME_SET_TRUNCATION(aStatus, aReflowState, aDesiredSize);

   103   return NS_OK;

   104 }

   106 nsIAtom*

   107 nsPageContentFrame::GetType() const

   108 {

   109   return nsGkAtoms::pageContentFrame;

   110 }

   112 #ifdef DEBUG_FRAME_DUMP

   113 nsresult

   114 nsPageContentFrame::GetFrameName(nsAString& aResult) const

   115 {

   116   return MakeFrameName(NS_LITERAL_STRING("PageContent"), aResult);

   117 }

   118 #endif

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