зеркало из https://github.com/mozilla/pjs.git
863 строки
33 KiB
C++
863 строки
33 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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* Robert O'Callahan <roc@ocallahan.org>
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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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/* rendering object for css3 multi-column layout */
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#include "nsHTMLContainerFrame.h"
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#include "nsIContent.h"
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#include "nsIFrame.h"
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#include "nsISupports.h"
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#include "nsIAtom.h"
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#include "nsPresContext.h"
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#include "nsHTMLParts.h"
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#include "nsGkAtoms.h"
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#include "nsStyleConsts.h"
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#include "nsCOMPtr.h"
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class nsColumnSetFrame : public nsHTMLContainerFrame {
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public:
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nsColumnSetFrame(nsStyleContext* aContext);
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NS_IMETHOD SetInitialChildList(nsIAtom* aListName,
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nsIFrame* aChildList);
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NS_IMETHOD 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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NS_IMETHOD AppendFrames(nsIAtom* aListName,
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nsIFrame* aFrameList);
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NS_IMETHOD InsertFrames(nsIAtom* aListName,
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nsIFrame* aPrevFrame,
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nsIFrame* aFrameList);
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NS_IMETHOD RemoveFrame(nsIAtom* aListName,
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nsIFrame* aOldFrame);
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// REVIEW: Now by default the background of a frame receives events,
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// so this GetFrameForPoint override is no longer necessary.
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virtual nsIFrame* GetContentInsertionFrame() {
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return GetFirstChild(nsnull)->GetContentInsertionFrame();
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}
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NS_IMETHOD BuildDisplayList(nsDisplayListBuilder* aBuilder,
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const nsRect& aDirtyRect,
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const nsDisplayListSet& aLists);
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virtual nsIAtom* GetType() const;
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#ifdef DEBUG
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NS_IMETHOD GetFrameName(nsAString& aResult) const {
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return MakeFrameName(NS_LITERAL_STRING("ColumnSet"), aResult);
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}
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#endif
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protected:
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nscoord mLastBalanceHeight;
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nsReflowStatus mLastFrameStatus;
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virtual PRIntn GetSkipSides() const;
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/**
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* These are the parameters that control the layout of columns.
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*/
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struct ReflowConfig {
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PRInt32 mBalanceColCount;
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nscoord mColWidth;
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nscoord mExpectedWidthLeftOver;
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nscoord mColGap;
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nscoord mColMaxHeight;
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};
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/**
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* Similar to nsBlockFrame::DrainOverflowLines. Locate any columns not
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* handled by our prev-in-flow, and any columns sitting on our own
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* overflow list, and put them in our primary child list for reflowing.
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*/
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void DrainOverflowColumns();
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/**
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* The basic reflow strategy is to call this function repeatedly to
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* obtain specific parameters that determine the layout of the
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* columns. This function will compute those parameters from the CSS
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* style. This function will also be responsible for implementing
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* the state machine that controls column balancing.
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*/
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ReflowConfig ChooseColumnStrategy(const nsHTMLReflowState& aReflowState);
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/**
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* Reflow column children. Returns PR_TRUE iff the content that was reflowed
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* fit into the mColMaxHeight.
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*/
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PRBool ReflowChildren(nsHTMLReflowMetrics& aDesiredSize,
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const nsHTMLReflowState& aReflowState,
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nsReflowStatus& aStatus,
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const ReflowConfig& aConfig,
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PRBool aLastColumnUnbounded,
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nsCollapsingMargin* aCarriedOutBottomMargin);
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};
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/**
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* Tracking issues:
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*
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* XXX cursor movement around the top and bottom of colums seems to make the editor
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* lose the caret.
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*
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* XXX should we support CSS columns applied to table elements?
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*/
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nsIFrame*
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NS_NewColumnSetFrame(nsIPresShell* aPresShell, nsStyleContext* aContext, PRUint32 aStateFlags)
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{
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nsColumnSetFrame* it = new (aPresShell) nsColumnSetFrame(aContext);
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if (it) {
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// set the state flags (if any are provided)
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it->AddStateBits(aStateFlags);
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}
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return it;
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}
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nsColumnSetFrame::nsColumnSetFrame(nsStyleContext* aContext)
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: nsHTMLContainerFrame(aContext), mLastBalanceHeight(NS_INTRINSICSIZE),
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mLastFrameStatus(NS_FRAME_COMPLETE)
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{
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}
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nsIAtom*
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nsColumnSetFrame::GetType() const
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{
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return nsGkAtoms::columnSetFrame;
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}
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NS_IMETHODIMP
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nsColumnSetFrame::SetInitialChildList(nsIAtom* aListName,
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nsIFrame* aChildList)
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{
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NS_ASSERTION(!aListName, "Only default child list supported");
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NS_ASSERTION(aChildList && !aChildList->GetNextSibling(),
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"initial child list must have exactly one child");
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// Queue up the frames for the content frame
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return nsHTMLContainerFrame::SetInitialChildList(nsnull, aChildList);
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}
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static nscoord GetAvailableContentWidth(const nsHTMLReflowState& aReflowState) {
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if (aReflowState.availableWidth == NS_INTRINSICSIZE) {
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return NS_INTRINSICSIZE;
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}
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nscoord borderPaddingWidth =
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aReflowState.mComputedBorderPadding.left +
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aReflowState.mComputedBorderPadding.right;
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return PR_MAX(0, aReflowState.availableWidth - borderPaddingWidth);
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}
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static nscoord GetAvailableContentHeight(const nsHTMLReflowState& aReflowState) {
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if (aReflowState.availableHeight == NS_INTRINSICSIZE) {
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return NS_INTRINSICSIZE;
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}
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nscoord borderPaddingHeight =
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aReflowState.mComputedBorderPadding.top +
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aReflowState.mComputedBorderPadding.bottom;
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return PR_MAX(0, aReflowState.availableHeight - borderPaddingHeight);
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}
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nsColumnSetFrame::ReflowConfig
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nsColumnSetFrame::ChooseColumnStrategy(const nsHTMLReflowState& aReflowState)
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{
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const nsStyleColumn* colStyle = GetStyleColumn();
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nscoord availContentWidth = GetAvailableContentWidth(aReflowState);
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if (aReflowState.ComputedWidth() != NS_INTRINSICSIZE) {
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availContentWidth = aReflowState.ComputedWidth();
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}
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nscoord colHeight = GetAvailableContentHeight(aReflowState);
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if (aReflowState.mComputedHeight != NS_INTRINSICSIZE) {
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colHeight = aReflowState.mComputedHeight;
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}
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nscoord colGap = 0;
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switch (colStyle->mColumnGap.GetUnit()) {
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case eStyleUnit_Coord:
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colGap = colStyle->mColumnGap.GetCoordValue();
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break;
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case eStyleUnit_Percent:
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if (availContentWidth != NS_INTRINSICSIZE) {
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colGap = NSToCoordRound(colStyle->mColumnGap.GetPercentValue()*availContentWidth);
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}
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break;
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case eStyleUnit_Normal:
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colGap = GetStyleFont()->mFont.size;
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break;
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default:
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NS_NOTREACHED("Unknown gap type");
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break;
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}
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PRInt32 numColumns = colStyle->mColumnCount;
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nscoord colWidth = NS_INTRINSICSIZE;
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if (colStyle->mColumnWidth.GetUnit() == eStyleUnit_Coord) {
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colWidth = colStyle->mColumnWidth.GetCoordValue();
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// Reduce column count if necessary to make columns fit in the
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// available width. Compute max number of columns that fit in
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// availContentWidth, satisfying colGap*(maxColumns - 1) +
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// colWidth*maxColumns <= availContentWidth
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if (availContentWidth != NS_INTRINSICSIZE && colWidth + colGap > 0
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&& numColumns > 0) {
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// This expression uses truncated rounding, which is what we
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// want
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PRInt32 maxColumns = (availContentWidth + colGap)/(colGap + colWidth);
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numColumns = PR_MAX(1, PR_MIN(numColumns, maxColumns));
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}
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} else if (numColumns > 0 && availContentWidth != NS_INTRINSICSIZE) {
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nscoord widthMinusGaps = availContentWidth - colGap*(numColumns - 1);
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colWidth = widthMinusGaps/numColumns;
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}
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// Take care of the situation where there's only one column but it's
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// still too wide
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colWidth = PR_MAX(1, PR_MIN(colWidth, availContentWidth));
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nscoord expectedWidthLeftOver = 0;
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if (colWidth != NS_INTRINSICSIZE && availContentWidth != NS_INTRINSICSIZE) {
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// distribute leftover space
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// First, determine how many columns will be showing if the column
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// count is auto
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if (numColumns <= 0) {
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// choose so that colGap*(nominalColumnCount - 1) +
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// colWidth*nominalColumnCount is nearly availContentWidth
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// make sure to round down
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numColumns = (availContentWidth + colGap)/(colGap + colWidth);
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if (numColumns <= 0) {
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numColumns = 1;
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}
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}
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// Compute extra space and divide it among the columns
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nscoord extraSpace = availContentWidth - (colWidth*numColumns + colGap*(numColumns - 1));
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nscoord extraToColumns = extraSpace/numColumns;
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colWidth += extraToColumns;
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expectedWidthLeftOver = extraSpace - (extraToColumns*numColumns);
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}
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// NOTE that the non-balancing behavior for non-auto computed height
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// is not in the CSS3 columns draft as of 18 January 2001
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if (aReflowState.mComputedHeight == NS_INTRINSICSIZE) {
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// Balancing!
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if (numColumns <= 0) {
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// Hmm, auto column count, column width or available width is unknown,
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// and balancing is required. Let's just use one column then.
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numColumns = 1;
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}
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colHeight = PR_MIN(mLastBalanceHeight, GetAvailableContentHeight(aReflowState));
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} else {
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// No balancing, so don't limit the column count
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numColumns = PR_INT32_MAX;
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}
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#ifdef DEBUG_roc
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printf("*** nsColumnSetFrame::ChooseColumnStrategy: numColumns=%d, colWidth=%d, expectedWidthLeftOver=%d, colHeight=%d, colGap=%d\n",
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numColumns, colWidth, expectedWidthLeftOver, colHeight, colGap);
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#endif
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ReflowConfig config = { numColumns, colWidth, expectedWidthLeftOver, colGap, colHeight };
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return config;
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}
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// XXX copied from nsBlockFrame, should this be moved to nsContainerFrame?
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static void
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PlaceFrameView(nsIFrame* aFrame)
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{
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if (aFrame->HasView())
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nsContainerFrame::PositionFrameView(aFrame);
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else
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nsContainerFrame::PositionChildViews(aFrame);
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}
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static void MoveChildTo(nsIFrame* aParent, nsIFrame* aChild, nsPoint aOrigin) {
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if (aChild->GetPosition() == aOrigin) {
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return;
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}
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nsRect* overflowArea = aChild->GetOverflowAreaProperty(PR_FALSE);
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nsRect r = overflowArea ? *overflowArea : nsRect(nsPoint(0, 0), aChild->GetSize());
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r += aChild->GetPosition();
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aParent->Invalidate(r);
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r -= aChild->GetPosition();
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aChild->SetPosition(aOrigin);
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r += aOrigin;
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aParent->Invalidate(r);
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PlaceFrameView(aChild);
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}
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PRBool
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nsColumnSetFrame::ReflowChildren(nsHTMLReflowMetrics& aDesiredSize,
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const nsHTMLReflowState& aReflowState,
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nsReflowStatus& aStatus,
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const ReflowConfig& aConfig,
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PRBool aUnboundedLastColumn,
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nsCollapsingMargin* aBottomMarginCarriedOut) {
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PRBool allFit = PR_TRUE;
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PRBool RTL = GetStyleVisibility()->mDirection == NS_STYLE_DIRECTION_RTL;
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PRBool shrinkingHeightOnly = !(GetStateBits() & (NS_FRAME_IS_DIRTY|NS_FRAME_HAS_DIRTY_CHILDREN)) &&
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mLastBalanceHeight > aConfig.mColMaxHeight;
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#ifdef DEBUG_roc
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printf("*** Doing column reflow pass: mLastBalanceHeight=%d, mColMaxHeight=%d, RTL=%d\n, mBalanceColCount=%d, mColWidth=%d, mColGap=%d\n",
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mLastBalanceHeight, aConfig.mColMaxHeight, RTL, aConfig.mBalanceColCount,
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aConfig.mColWidth, aConfig.mColGap);
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#endif
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DrainOverflowColumns();
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if (mLastBalanceHeight != aConfig.mColMaxHeight) {
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mLastBalanceHeight = aConfig.mColMaxHeight;
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// XXX Seems like this could fire if incremental reflow pushed the column set
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// down so we reflow incrementally with a different available height.
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// We need a way to do an incremental reflow and be sure availableHeight
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// changes are taken account of! Right now I think block frames with absolute
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// children might exit early.
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//NS_ASSERTION(aKidReason != eReflowReason_Incremental,
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// "incremental reflow should not have changed the balance height");
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}
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// get our border and padding
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const nsMargin &borderPadding = aReflowState.mComputedBorderPadding;
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nsRect contentRect(0, 0, 0, 0);
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nsRect overflowRect(0, 0, 0, 0);
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nsIFrame* child = mFrames.FirstChild();
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nsPoint childOrigin = nsPoint(borderPadding.left, borderPadding.top);
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// For RTL, figure out where the last column's left edge should be. Since the
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// columns might not fill the frame exactly, we need to account for the
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// slop. Otherwise we'll waste time moving the columns by some tiny
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// amount unnecessarily.
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nscoord targetX = borderPadding.left;
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if (RTL) {
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nscoord availWidth = aReflowState.availableWidth;
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if (aReflowState.ComputedWidth() != NS_INTRINSICSIZE) {
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availWidth = aReflowState.ComputedWidth();
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}
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if (availWidth != NS_INTRINSICSIZE) {
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childOrigin.x += availWidth - aConfig.mColWidth;
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targetX += aConfig.mExpectedWidthLeftOver;
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#ifdef DEBUG_roc
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printf("*** childOrigin.x = %d\n", childOrigin.x);
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#endif
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}
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}
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int columnCount = 0;
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PRBool reflowNext = PR_FALSE;
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while (child) {
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// Try to skip reflowing the child. We can't skip if the child is dirty. We also can't
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// skip if the next column is dirty, because the next column's first line(s)
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// might be pullable back to this column. We can't skip if it's the last child
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// because we need to obtain the bottom margin.
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PRBool skipIncremental = !(GetStateBits() & NS_FRAME_IS_DIRTY)
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&& !(child->GetStateBits() & NS_FRAME_IS_DIRTY)
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&& child->GetNextSibling()
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&& !(child->GetNextSibling()->GetStateBits() & NS_FRAME_IS_DIRTY);
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// If we need to pull up content from the prev-in-flow then this is not just
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// a height shrink. The prev in flow will have set the dirty bit.
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// Check the overflow rect YMost instead of just the child's content height. The child
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// may have overflowing content that cares about the available height boundary.
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// (It may also have overflowing content that doesn't care about the available height
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// boundary, but if so, too bad, this optimization is defeated.)
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PRBool skipResizeHeightShrink = shrinkingHeightOnly
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&& !(child->GetStateBits() & NS_FRAME_IS_DIRTY)
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&& child->GetOverflowRect().YMost() <= aConfig.mColMaxHeight;
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if (!reflowNext && (skipIncremental || skipResizeHeightShrink)) {
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// This child does not need to be reflowed, but we may need to move it
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MoveChildTo(this, child, childOrigin);
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// If this is the last frame then make sure we get the right status
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if (child->GetNextSibling()) {
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aStatus = NS_FRAME_NOT_COMPLETE;
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} else {
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aStatus = mLastFrameStatus;
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}
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#ifdef DEBUG_roc
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printf("*** Skipping child #%d %p (incremental %d, resize height shrink %d): status = %d\n",
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columnCount, (void*)child, skipIncremental, skipResizeHeightShrink, aStatus);
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#endif
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} else {
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nsSize availSize(aConfig.mColWidth, aConfig.mColMaxHeight);
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if (aUnboundedLastColumn && columnCount == aConfig.mBalanceColCount - 1) {
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availSize.height = GetAvailableContentHeight(aReflowState);
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}
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if (reflowNext)
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child->AddStateBits(NS_FRAME_IS_DIRTY);
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nsHTMLReflowState kidReflowState(GetPresContext(), aReflowState, child,
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availSize, availSize.width,
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aReflowState.mComputedHeight);
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kidReflowState.mFlags.mIsTopOfPage = PR_TRUE;
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kidReflowState.mFlags.mTableIsSplittable = PR_FALSE;
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#ifdef DEBUG_roc
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printf("*** Reflowing child #%d %p: availHeight=%d\n",
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columnCount, (void*)child,availSize.height);
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#endif
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// Note if the column's next in flow is not being changed by this incremental reflow.
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// This may allow the current column to avoid trying to pull lines from the next column.
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if (child->GetNextSibling() &&
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!(GetStateBits() & NS_FRAME_IS_DIRTY) &&
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!(child->GetNextSibling()->GetStateBits() & NS_FRAME_IS_DIRTY)) {
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kidReflowState.mFlags.mNextInFlowUntouched = PR_TRUE;
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}
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nsHTMLReflowMetrics kidDesiredSize(aDesiredSize.mFlags);
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// XXX it would be cool to consult the space manager for the
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// previous block to figure out the region of floats from the
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// previous column that extend into this column, and subtract
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// that region from the new space manager. So you could stick a
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// really big float in the first column and text in following
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// columns would flow around it.
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// Reflow the frame
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ReflowChild(child, GetPresContext(), kidDesiredSize, kidReflowState,
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childOrigin.x + kidReflowState.mComputedMargin.left,
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childOrigin.y + kidReflowState.mComputedMargin.top,
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|
0, aStatus);
|
|
|
|
if (kidDesiredSize.height > aConfig.mColMaxHeight) {
|
|
allFit = PR_FALSE;
|
|
}
|
|
|
|
reflowNext = (aStatus & NS_FRAME_REFLOW_NEXTINFLOW) != 0;
|
|
|
|
#ifdef DEBUG_roc
|
|
printf("*** Reflowed child #%d %p: status = %d, desiredSize=%d,%d\n",
|
|
columnCount, (void*)child, aStatus, kidDesiredSize.width, kidDesiredSize.height);
|
|
#endif
|
|
|
|
NS_FRAME_TRACE_REFLOW_OUT("Column::Reflow", aStatus);
|
|
|
|
*aBottomMarginCarriedOut = kidDesiredSize.mCarriedOutBottomMargin;
|
|
|
|
FinishReflowChild(child, GetPresContext(), &kidReflowState,
|
|
kidDesiredSize, childOrigin.x, childOrigin.y, 0);
|
|
}
|
|
|
|
contentRect.UnionRect(contentRect, child->GetRect());
|
|
|
|
ConsiderChildOverflow(overflowRect, child);
|
|
|
|
// Build a continuation column if necessary
|
|
nsIFrame* kidNextInFlow = child->GetNextInFlow();
|
|
|
|
if (NS_FRAME_IS_COMPLETE(aStatus) && !NS_FRAME_IS_TRUNCATED(aStatus)) {
|
|
NS_ASSERTION(!kidNextInFlow, "next in flow should have been deleted");
|
|
break;
|
|
} else {
|
|
++columnCount;
|
|
// Make sure that the column has a next-in-flow. If not, we must
|
|
// create one to hold the overflowing stuff, even if we're just
|
|
// going to put it on our overflow list and let *our*
|
|
// next in flow handle it.
|
|
if (!kidNextInFlow) {
|
|
NS_ASSERTION(aStatus & NS_FRAME_REFLOW_NEXTINFLOW,
|
|
"We have to create a continuation, but the block doesn't want us to reflow it?");
|
|
|
|
// We need to create a continuing column
|
|
nsresult rv = CreateNextInFlow(GetPresContext(), this, child, kidNextInFlow);
|
|
|
|
if (NS_FAILED(rv)) {
|
|
NS_NOTREACHED("Couldn't create continuation");
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (columnCount >= aConfig.mBalanceColCount) {
|
|
// No more columns allowed here. Stop.
|
|
aStatus |= NS_FRAME_REFLOW_NEXTINFLOW;
|
|
kidNextInFlow->AddStateBits(NS_FRAME_IS_DIRTY);
|
|
|
|
// Move any of our leftover columns to our overflow list. Our
|
|
// next-in-flow will eventually pick them up.
|
|
nsIFrame* continuationColumns = child->GetNextSibling();
|
|
if (continuationColumns) {
|
|
SetOverflowFrames(GetPresContext(), continuationColumns);
|
|
child->SetNextSibling(nsnull);
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
|
|
// Advance to the next column
|
|
child = child->GetNextSibling();
|
|
|
|
if (child) {
|
|
if (!RTL) {
|
|
childOrigin.x += aConfig.mColWidth + aConfig.mColGap;
|
|
} else {
|
|
childOrigin.x -= aConfig.mColWidth + aConfig.mColGap;
|
|
}
|
|
|
|
#ifdef DEBUG_roc
|
|
printf("*** NEXT CHILD ORIGIN.x = %d\n", childOrigin.x);
|
|
#endif
|
|
}
|
|
}
|
|
|
|
// If we're doing RTL, we need to make sure our last column is at the left-hand side of the frame.
|
|
if (RTL && childOrigin.x != targetX) {
|
|
overflowRect = nsRect(0, 0, 0, 0);
|
|
contentRect = nsRect(0, 0, 0, 0);
|
|
PRInt32 deltaX = targetX - childOrigin.x;
|
|
#ifdef DEBUG_roc
|
|
printf("*** CHILDORIGIN.x = %d, targetX = %d, DELTAX = %d\n", childOrigin.x, targetX, deltaX);
|
|
#endif
|
|
for (child = mFrames.FirstChild(); child; child = child->GetNextSibling()) {
|
|
MoveChildTo(this, child, child->GetPosition() + nsPoint(deltaX, 0));
|
|
ConsiderChildOverflow(overflowRect, child);
|
|
contentRect.UnionRect(contentRect, child->GetRect());
|
|
}
|
|
}
|
|
|
|
mLastFrameStatus = aStatus;
|
|
|
|
// contentRect included the borderPadding.left,borderPadding.top of the child rects
|
|
contentRect -= nsPoint(borderPadding.left, borderPadding.top);
|
|
|
|
nsSize contentSize = nsSize(contentRect.XMost(), contentRect.YMost());
|
|
|
|
// Apply computed and min/max values
|
|
if (aReflowState.mComputedHeight != NS_INTRINSICSIZE) {
|
|
contentSize.height = aReflowState.mComputedHeight;
|
|
} else {
|
|
if (NS_UNCONSTRAINEDSIZE != aReflowState.mComputedMaxHeight) {
|
|
contentSize.height = PR_MIN(aReflowState.mComputedMaxHeight, contentSize.height);
|
|
}
|
|
if (NS_UNCONSTRAINEDSIZE != aReflowState.mComputedMinHeight) {
|
|
contentSize.height = PR_MAX(aReflowState.mComputedMinHeight, contentSize.height);
|
|
}
|
|
}
|
|
if (aReflowState.ComputedWidth() != NS_INTRINSICSIZE) {
|
|
contentSize.width = aReflowState.ComputedWidth();
|
|
} else {
|
|
if (NS_UNCONSTRAINEDSIZE != aReflowState.mComputedMaxWidth) {
|
|
contentSize.width = PR_MIN(aReflowState.mComputedMaxWidth, contentSize.width);
|
|
}
|
|
if (NS_UNCONSTRAINEDSIZE != aReflowState.mComputedMinWidth) {
|
|
contentSize.width = PR_MAX(aReflowState.mComputedMinWidth, contentSize.width);
|
|
}
|
|
}
|
|
|
|
aDesiredSize.height = borderPadding.top + contentSize.height +
|
|
borderPadding.bottom;
|
|
aDesiredSize.width = contentSize.width + borderPadding.left + borderPadding.right;
|
|
overflowRect.UnionRect(overflowRect, nsRect(0, 0, aDesiredSize.width, aDesiredSize.height));
|
|
aDesiredSize.mOverflowArea = overflowRect;
|
|
|
|
#ifdef DEBUG_roc
|
|
printf("*** DONE PASS feasible=%d\n", allFit && NS_FRAME_IS_COMPLETE(aStatus)
|
|
&& !NS_FRAME_IS_TRUNCATED(aStatus));
|
|
#endif
|
|
return allFit && NS_FRAME_IS_COMPLETE(aStatus)
|
|
&& !NS_FRAME_IS_TRUNCATED(aStatus);
|
|
}
|
|
|
|
static nscoord ComputeSumOfChildHeights(nsIFrame* aFrame) {
|
|
nscoord totalHeight = 0;
|
|
for (nsIFrame* f = aFrame->GetFirstChild(nsnull); f; f = f->GetNextSibling()) {
|
|
// individual columns don't have borders or padding so this is a
|
|
// reasonable way to get their content height
|
|
totalHeight += f->GetSize().height;
|
|
}
|
|
return totalHeight;
|
|
}
|
|
|
|
void
|
|
nsColumnSetFrame::DrainOverflowColumns()
|
|
{
|
|
// First grab the prev-in-flows overflows and reparent them to this
|
|
// frame.
|
|
nsColumnSetFrame* prev = NS_STATIC_CAST(nsColumnSetFrame*, GetPrevInFlow());
|
|
if (prev) {
|
|
nsIFrame* overflows = prev->GetOverflowFrames(GetPresContext(), PR_TRUE);
|
|
if (overflows) {
|
|
// Make all the frames on the overflow list mine
|
|
nsIFrame* lastFrame = nsnull;
|
|
for (nsIFrame* f = overflows; f; f = f->GetNextSibling()) {
|
|
f->SetParent(this);
|
|
|
|
// When pushing and pulling frames we need to check for whether any
|
|
// views need to be reparented
|
|
nsHTMLContainerFrame::ReparentFrameView(GetPresContext(), f, prev, this);
|
|
|
|
// Get the next frame
|
|
lastFrame = f;
|
|
}
|
|
|
|
NS_ASSERTION(lastFrame, "overflow list was created with no frames");
|
|
lastFrame->SetNextSibling(mFrames.FirstChild());
|
|
|
|
mFrames.SetFrames(overflows);
|
|
}
|
|
}
|
|
|
|
// Now pull back our own overflows and append them to our children.
|
|
// We don't need to reparent them since we're already their parent.
|
|
nsIFrame* overflows = GetOverflowFrames(GetPresContext(), PR_TRUE);
|
|
if (overflows) {
|
|
mFrames.AppendFrames(this, overflows);
|
|
}
|
|
}
|
|
|
|
NS_IMETHODIMP
|
|
nsColumnSetFrame::Reflow(nsPresContext* aPresContext,
|
|
nsHTMLReflowMetrics& aDesiredSize,
|
|
const nsHTMLReflowState& aReflowState,
|
|
nsReflowStatus& aStatus)
|
|
{
|
|
DO_GLOBAL_REFLOW_COUNT("nsColumnSetFrame");
|
|
DISPLAY_REFLOW(aPresContext, this, aReflowState, aDesiredSize, aStatus);
|
|
|
|
// Initialize OUT parameter
|
|
aStatus = NS_FRAME_COMPLETE;
|
|
|
|
//------------ Handle Incremental Reflow -----------------
|
|
|
|
ReflowConfig config = ChooseColumnStrategy(aReflowState);
|
|
PRBool isBalancing = config.mBalanceColCount < PR_INT32_MAX;
|
|
|
|
// If balancing, then we allow the last column to grow to unbounded
|
|
// height during the first reflow. This gives us a way to estimate
|
|
// what the average column height should be, because we can measure
|
|
// the heights of all the columns and sum them up. But don't do this
|
|
// if we have a next in flow because we don't want to suck all its
|
|
// content back here and then have to push it out again!
|
|
nsIFrame* nextInFlow = GetNextInFlow();
|
|
PRBool unboundedLastColumn = isBalancing && nextInFlow;
|
|
nsCollapsingMargin carriedOutBottomMargin;
|
|
PRBool feasible = ReflowChildren(aDesiredSize, aReflowState,
|
|
aStatus, config, unboundedLastColumn, &carriedOutBottomMargin);
|
|
|
|
if (isBalancing) {
|
|
nscoord availableContentHeight = GetAvailableContentHeight(aReflowState);
|
|
|
|
// Termination of the algorithm below is guaranteed because
|
|
// knownFeasibleHeight - knownInfeasibleHeight decreases in every
|
|
// iteration.
|
|
nscoord knownFeasibleHeight = NS_INTRINSICSIZE;
|
|
nscoord knownInfeasibleHeight = 0;
|
|
// We set this flag when we detect that we may contain a frame
|
|
// that can break anywhere (thus foiling the linear decrease-by-one
|
|
// search)
|
|
PRBool maybeContinuousBreakingDetected = PR_FALSE;
|
|
|
|
while (1) {
|
|
nscoord lastKnownFeasibleHeight = knownFeasibleHeight;
|
|
|
|
nscoord maxHeight = 0;
|
|
for (nsIFrame* f = mFrames.FirstChild(); f; f = f->GetNextSibling()) {
|
|
// There could be out-of-flow content which is respecting height
|
|
// constraints ... so an available height which is greater than
|
|
// the in-flow frame height but less than the overflow height might
|
|
// not be enough to fit the content.
|
|
maxHeight = PR_MAX(maxHeight, f->GetOverflowRect().YMost());
|
|
}
|
|
|
|
// Record what we learned from the last reflow
|
|
if (feasible) {
|
|
// maxHeight is feasible. Also, mLastBalanceHeight is feasible.
|
|
knownFeasibleHeight = PR_MIN(knownFeasibleHeight, maxHeight);
|
|
knownFeasibleHeight = PR_MIN(knownFeasibleHeight, mLastBalanceHeight);
|
|
|
|
// Furthermore, no height less than the height of the last
|
|
// column can ever be feasible. (We might be able to reduce the
|
|
// height of a non-last column by moving content to a later column,
|
|
// but we can't do that with the last column.)
|
|
if (mFrames.GetLength() == config.mBalanceColCount) {
|
|
knownInfeasibleHeight = PR_MAX(knownInfeasibleHeight,
|
|
mFrames.LastChild()->GetSize().height - 1);
|
|
}
|
|
} else {
|
|
knownInfeasibleHeight = PR_MAX(knownInfeasibleHeight, mLastBalanceHeight);
|
|
|
|
if (unboundedLastColumn) {
|
|
// The last column is unbounded, so all content got reflowed, so the
|
|
// maxHeight is feasible.
|
|
knownFeasibleHeight = PR_MIN(knownFeasibleHeight, maxHeight);
|
|
}
|
|
}
|
|
|
|
#ifdef DEBUG_roc
|
|
printf("*** nsColumnSetFrame::Reflow balancing knownInfeasible=%d knownFeasible=%d\n",
|
|
knownInfeasibleHeight, knownFeasibleHeight);
|
|
#endif
|
|
|
|
if (knownInfeasibleHeight >= knownFeasibleHeight - 1) {
|
|
// knownFeasibleHeight is where we want to be
|
|
break;
|
|
}
|
|
|
|
if (knownInfeasibleHeight >= availableContentHeight) {
|
|
break;
|
|
}
|
|
|
|
if (lastKnownFeasibleHeight - knownFeasibleHeight == 1) {
|
|
// We decreased the feasible height by one twip only. This could
|
|
// indicate that there is a continuously breakable child frame
|
|
// that we are crawling through.
|
|
maybeContinuousBreakingDetected = PR_TRUE;
|
|
}
|
|
|
|
nscoord nextGuess = (knownFeasibleHeight + knownInfeasibleHeight)/2;
|
|
// The constant of 600 twips is arbitrary. It's about two line-heights.
|
|
if (knownFeasibleHeight - nextGuess < 600 &&
|
|
!maybeContinuousBreakingDetected) {
|
|
// We're close to our target, so just try shrinking just the
|
|
// minimum amount that will cause one of our columns to break
|
|
// differently.
|
|
nextGuess = knownFeasibleHeight - 1;
|
|
} else if (unboundedLastColumn) {
|
|
// Make a guess by dividing that into N columns. Add some slop
|
|
// to try to make it on the feasible side. The constant of
|
|
// 600 twips is arbitrary. It's about two line-heights.
|
|
nextGuess = ComputeSumOfChildHeights(this)/config.mBalanceColCount + 600;
|
|
// Sanitize it
|
|
nextGuess = PR_MIN(PR_MAX(nextGuess, knownInfeasibleHeight + 1),
|
|
knownFeasibleHeight - 1);
|
|
} else if (knownFeasibleHeight == NS_INTRINSICSIZE) {
|
|
// This can happen when we had a next-in-flow so we didn't
|
|
// want to do an unbounded height measuring step. Let's just increase
|
|
// from the infeasible height by some reasonable amount.
|
|
nextGuess = knownInfeasibleHeight*2 + 600;
|
|
}
|
|
// Don't bother guessing more than our height constraint.
|
|
nextGuess = PR_MIN(availableContentHeight, nextGuess);
|
|
|
|
#ifdef DEBUG_roc
|
|
printf("*** nsColumnSetFrame::Reflow balancing choosing next guess=%d\n", nextGuess);
|
|
#endif
|
|
|
|
config.mColMaxHeight = nextGuess;
|
|
|
|
unboundedLastColumn = PR_FALSE;
|
|
AddStateBits(NS_FRAME_IS_DIRTY);
|
|
feasible = ReflowChildren(aDesiredSize, aReflowState,
|
|
aStatus, config, PR_FALSE,
|
|
&carriedOutBottomMargin);
|
|
}
|
|
|
|
if (!feasible) {
|
|
// We may need to reflow one more time at the feasible height to
|
|
// get a valid layout.
|
|
PRBool skip = PR_FALSE;
|
|
if (knownInfeasibleHeight >= availableContentHeight) {
|
|
config.mColMaxHeight = availableContentHeight;
|
|
if (mLastBalanceHeight == availableContentHeight) {
|
|
skip = PR_TRUE;
|
|
}
|
|
} else {
|
|
config.mColMaxHeight = knownFeasibleHeight;
|
|
}
|
|
if (!skip) {
|
|
AddStateBits(NS_FRAME_IS_DIRTY);
|
|
ReflowChildren(aDesiredSize, aReflowState,
|
|
aStatus, config, PR_FALSE, &carriedOutBottomMargin);
|
|
}
|
|
}
|
|
}
|
|
|
|
CheckInvalidateSizeChange(GetPresContext(), aDesiredSize, aReflowState);
|
|
|
|
FinishAndStoreOverflow(&aDesiredSize);
|
|
aDesiredSize.mCarriedOutBottomMargin = carriedOutBottomMargin;
|
|
|
|
NS_FRAME_SET_TRUNCATION(aStatus, aReflowState, aDesiredSize);
|
|
|
|
return NS_OK;
|
|
}
|
|
|
|
NS_IMETHODIMP
|
|
nsColumnSetFrame::BuildDisplayList(nsDisplayListBuilder* aBuilder,
|
|
const nsRect& aDirtyRect,
|
|
const nsDisplayListSet& aLists) {
|
|
nsresult rv = DisplayBorderBackgroundOutline(aBuilder, aLists);
|
|
NS_ENSURE_SUCCESS(rv, rv);
|
|
|
|
nsIFrame* kid = mFrames.FirstChild();
|
|
// Our children won't have backgrounds so it doesn't matter where we put them.
|
|
while (kid) {
|
|
nsresult rv = BuildDisplayListForChild(aBuilder, kid, aDirtyRect, aLists);
|
|
NS_ENSURE_SUCCESS(rv, rv);
|
|
kid = kid->GetNextSibling();
|
|
}
|
|
return NS_OK;
|
|
}
|
|
|
|
PRIntn
|
|
nsColumnSetFrame::GetSkipSides() const
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
NS_IMETHODIMP
|
|
nsColumnSetFrame::AppendFrames(nsIAtom* aListName,
|
|
nsIFrame* aFrameList)
|
|
{
|
|
NS_NOTREACHED("AppendFrames not supported");
|
|
return NS_ERROR_NOT_IMPLEMENTED;
|
|
}
|
|
|
|
NS_IMETHODIMP
|
|
nsColumnSetFrame::InsertFrames(nsIAtom* aListName,
|
|
nsIFrame* aPrevFrame,
|
|
nsIFrame* aFrameList)
|
|
{
|
|
NS_NOTREACHED("InsertFrames not supported");
|
|
return NS_ERROR_NOT_IMPLEMENTED;
|
|
}
|
|
|
|
NS_IMETHODIMP
|
|
nsColumnSetFrame::RemoveFrame(nsIAtom* aListName,
|
|
nsIFrame* aOldFrame)
|
|
{
|
|
NS_NOTREACHED("RemoveFrame not supported");
|
|
return NS_ERROR_NOT_IMPLEMENTED;
|
|
}
|