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180 lines
7.0 KiB
C++
180 lines
7.0 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is mozilla.org code.
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*
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* The Initial Developer of the Original Code is
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* Netscape Communications Corporation.
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* Portions created by the Initial Developer are Copyright (C) 1998
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either of the GNU General Public License Version 2 or later (the "GPL"),
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* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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#include "nsPageContentFrame.h"
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#include "nsPageFrame.h"
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#include "nsPlaceholderFrame.h"
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#include "nsCSSFrameConstructor.h"
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#include "nsHTMLContainerFrame.h"
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#include "nsHTMLParts.h"
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#include "nsIContent.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 "nsReadableUtils.h"
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#include "nsSimplePageSequence.h"
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#include "nsDisplayList.h"
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nsIFrame*
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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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/* virtual */ nsSize
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nsPageContentFrame::ComputeSize(nsRenderingContext *aRenderingContext,
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nsSize aCBSize, nscoord aAvailableWidth,
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nsSize aMargin, nsSize aBorder, nsSize aPadding,
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PRBool aShrinkWrap)
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{
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NS_ASSERTION(mPD, "Pages are supposed to have page data");
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nscoord height = (!mPD || mPD->mReflowSize.height == NS_UNCONSTRAINEDSIZE)
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? NS_UNCONSTRAINEDSIZE
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: (mPD->mReflowSize.height - mPD->mReflowMargin.TopBottom());
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return nsSize(aAvailableWidth, height);
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}
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NS_IMETHODIMP
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nsPageContentFrame::Reflow(nsPresContext* aPresContext,
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nsHTMLReflowMetrics& aDesiredSize,
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const nsHTMLReflowState& aReflowState,
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nsReflowStatus& aStatus)
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{
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DO_GLOBAL_REFLOW_COUNT("nsPageContentFrame");
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DISPLAY_REFLOW(aPresContext, this, aReflowState, aDesiredSize, aStatus);
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aStatus = NS_FRAME_COMPLETE; // initialize out parameter
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nsresult rv = NS_OK;
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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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NS_ENSURE_SUCCESS(rv, rv);
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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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SetSize(nsSize(aReflowState.availableWidth, aReflowState.availableHeight));
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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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nsSize maxSize(aReflowState.availableWidth, aReflowState.availableHeight);
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nsHTMLReflowState kidReflowState(aPresContext, aReflowState, frame, maxSize);
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kidReflowState.SetComputedHeight(aReflowState.availableHeight);
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mPD->mPageContentSize = aReflowState.availableWidth;
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// Reflow the page content area
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rv = ReflowChild(frame, aPresContext, aDesiredSize, kidReflowState, 0, 0, 0, aStatus);
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NS_ENSURE_SUCCESS(rv, rv);
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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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kidReflowState.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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mPD->mPageContentXMost =
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xmost +
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kidReflowState.mStyleBorder->GetActualBorderWidth(NS_SIDE_RIGHT) +
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padding.right;
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}
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}
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// Place and size the child
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FinishReflowChild(frame, aPresContext, &kidReflowState, aDesiredSize, 0, 0, 0);
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NS_ASSERTION(aPresContext->IsDynamic() || !NS_FRAME_IS_FULLY_COMPLETE(aStatus) ||
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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 = NS_FRAME_COMPLETE;
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mFixedContainer.Reflow(this, aPresContext, aReflowState, fixedStatus,
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aReflowState.availableWidth,
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aReflowState.availableHeight,
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PR_FALSE, PR_TRUE, PR_TRUE, // XXX could be optimized
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nsnull /* ignore overflow */);
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NS_ASSERTION(NS_FRAME_IS_COMPLETE(fixedStatus), "fixed frames can be truncated, but not incomplete");
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// Return our desired size
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aDesiredSize.width = aReflowState.availableWidth;
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if (aReflowState.availableHeight != NS_UNCONSTRAINEDSIZE) {
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aDesiredSize.height = aReflowState.availableHeight;
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}
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FinishAndStoreOverflow(&aDesiredSize);
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NS_FRAME_SET_TRUNCATION(aStatus, aReflowState, aDesiredSize);
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return NS_OK;
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}
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nsIAtom*
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nsPageContentFrame::GetType() const
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{
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return nsGkAtoms::pageContentFrame;
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}
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#ifdef DEBUG
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NS_IMETHODIMP
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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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/* virtual */ PRBool
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nsPageContentFrame::IsContainingBlock() const
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{
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return PR_TRUE;
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}
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