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fe9e70e605
In nsRuleNode, when we parse a number of columns from a CSS style sheet, we enforce a rule that the number of columns cannot exceed 1000. This patch simply enforces the same rule when we decide that the column count will be generated based on the available width (e.g. the column-count property has a value of 'auto').
1048 lines
41 KiB
C++
1048 lines
41 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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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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/* rendering object for css3 multi-column layout */
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#include "nsColumnSetFrame.h"
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using namespace mozilla;
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using namespace mozilla::layout;
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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, uint32_t aStateFlags)
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{
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nsColumnSetFrame* it = new (aPresShell) nsColumnSetFrame(aContext);
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it->AddStateBits(aStateFlags | NS_BLOCK_MARGIN_ROOT);
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return it;
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}
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NS_IMPL_FRAMEARENA_HELPERS(nsColumnSetFrame)
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nsColumnSetFrame::nsColumnSetFrame(nsStyleContext* aContext)
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: nsContainerFrame(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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static void
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PaintColumnRule(nsIFrame* aFrame, nsRenderingContext* aCtx,
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const nsRect& aDirtyRect, nsPoint aPt)
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{
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static_cast<nsColumnSetFrame*>(aFrame)->PaintColumnRule(aCtx, aDirtyRect, aPt);
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}
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void
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nsColumnSetFrame::PaintColumnRule(nsRenderingContext* aCtx,
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const nsRect& aDirtyRect,
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const nsPoint& aPt)
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{
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nsIFrame* child = mFrames.FirstChild();
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if (!child)
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return; // no columns
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nsIFrame* nextSibling = child->GetNextSibling();
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if (!nextSibling)
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return; // 1 column only - this means no gap to draw on
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bool isRTL = StyleVisibility()->mDirection == NS_STYLE_DIRECTION_RTL;
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const nsStyleColumn* colStyle = StyleColumn();
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uint8_t ruleStyle;
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// Per spec, inset => ridge and outset => groove
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if (colStyle->mColumnRuleStyle == NS_STYLE_BORDER_STYLE_INSET)
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ruleStyle = NS_STYLE_BORDER_STYLE_RIDGE;
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else if (colStyle->mColumnRuleStyle == NS_STYLE_BORDER_STYLE_OUTSET)
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ruleStyle = NS_STYLE_BORDER_STYLE_GROOVE;
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else
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ruleStyle = colStyle->mColumnRuleStyle;
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nsPresContext* presContext = PresContext();
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nscoord ruleWidth = colStyle->GetComputedColumnRuleWidth();
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if (!ruleWidth)
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return;
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nscolor ruleColor =
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GetVisitedDependentColor(eCSSProperty__moz_column_rule_color);
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// In order to re-use a large amount of code, we treat the column rule as a border.
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// We create a new border style object and fill in all the details of the column rule as
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// the left border. PaintBorder() does all the rendering for us, so we not
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// only save an enormous amount of code but we'll support all the line styles that
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// we support on borders!
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nsStyleBorder border(presContext);
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border.SetBorderWidth(NS_SIDE_LEFT, ruleWidth);
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border.SetBorderStyle(NS_SIDE_LEFT, ruleStyle);
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border.SetBorderColor(NS_SIDE_LEFT, ruleColor);
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// Get our content rect as an absolute coordinate, not relative to
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// our parent (which is what the X and Y normally is)
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nsRect contentRect = GetContentRect() - GetRect().TopLeft() + aPt;
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nsSize ruleSize(ruleWidth, contentRect.height);
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while (nextSibling) {
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// The frame tree goes RTL in RTL
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nsIFrame* leftSibling = isRTL ? nextSibling : child;
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nsIFrame* rightSibling = isRTL ? child : nextSibling;
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// Each child frame's position coordinates is actually relative to this nsColumnSetFrame.
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// linePt will be at the top-left edge to paint the line.
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nsPoint edgeOfLeftSibling = leftSibling->GetRect().TopRight() + aPt;
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nsPoint edgeOfRightSibling = rightSibling->GetRect().TopLeft() + aPt;
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nsPoint linePt((edgeOfLeftSibling.x + edgeOfRightSibling.x - ruleWidth) / 2,
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contentRect.y);
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nsRect lineRect(linePt, ruleSize);
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nsCSSRendering::PaintBorderWithStyleBorder(presContext, *aCtx, this,
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aDirtyRect, lineRect, border, StyleContext(),
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// Remember, we only have the "left" "border". Skip everything else
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(1 << NS_SIDE_TOP | 1 << NS_SIDE_RIGHT | 1 << NS_SIDE_BOTTOM));
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child = nextSibling;
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nextSibling = nextSibling->GetNextSibling();
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}
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}
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NS_IMETHODIMP
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nsColumnSetFrame::SetInitialChildList(ChildListID aListID,
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nsFrameList& aChildList)
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{
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if (aListID == kAbsoluteList) {
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return nsContainerFrame::SetInitialChildList(aListID, aChildList);
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}
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NS_ASSERTION(aListID == kPrincipalList,
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"Only default child list supported");
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NS_ASSERTION(aChildList.OnlyChild(),
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"initial child list must have exaisRevertingctly one child");
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// Queue up the frames for the content frame
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return nsContainerFrame::SetInitialChildList(kPrincipalList, aChildList);
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}
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static nscoord
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GetAvailableContentWidth(const nsHTMLReflowState& aReflowState)
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{
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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 std::max(0, aReflowState.availableWidth - borderPaddingWidth);
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}
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static nscoord
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GetAvailableContentHeight(const nsHTMLReflowState& aReflowState)
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{
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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 std::max(0, aReflowState.availableHeight - borderPaddingHeight);
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}
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static nscoord
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GetColumnGap(nsColumnSetFrame* aFrame,
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const nsStyleColumn* aColStyle)
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{
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if (eStyleUnit_Normal == aColStyle->mColumnGap.GetUnit())
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return aFrame->StyleFont()->mFont.size;
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if (eStyleUnit_Coord == aColStyle->mColumnGap.GetUnit()) {
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nscoord colGap = aColStyle->mColumnGap.GetCoordValue();
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NS_ASSERTION(colGap >= 0, "negative column gap");
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return colGap;
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}
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NS_NOTREACHED("Unknown gap type");
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return 0;
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}
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nsColumnSetFrame::ReflowConfig
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nsColumnSetFrame::ChooseColumnStrategy(const nsHTMLReflowState& aReflowState,
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bool aForceAuto = false,
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nscoord aFeasibleHeight = NS_INTRINSICSIZE,
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nscoord aInfeasibleHeight = 0)
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{
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nscoord knownFeasibleHeight = aFeasibleHeight;
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nscoord knownInfeasibleHeight = aInfeasibleHeight;
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const nsStyleColumn* colStyle = StyleColumn();
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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.ComputedHeight() != NS_INTRINSICSIZE) {
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colHeight = aReflowState.ComputedHeight();
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} else if (aReflowState.mComputedMaxHeight != NS_INTRINSICSIZE) {
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colHeight = aReflowState.mComputedMaxHeight;
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}
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nscoord colGap = GetColumnGap(this, colStyle);
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int32_t numColumns = colStyle->mColumnCount;
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// If column-fill is set to 'balance', then we want to balance the columns.
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const bool isBalancing = colStyle->mColumnFill == NS_STYLE_COLUMN_FILL_BALANCE
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&& !aForceAuto;
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if (isBalancing) {
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const uint32_t MAX_NESTED_COLUMN_BALANCING = 2;
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uint32_t cnt = 0;
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for (const nsHTMLReflowState* rs = aReflowState.parentReflowState;
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rs && cnt < MAX_NESTED_COLUMN_BALANCING; rs = rs->parentReflowState) {
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if (rs->mFlags.mIsColumnBalancing) {
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++cnt;
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}
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}
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if (cnt == MAX_NESTED_COLUMN_BALANCING) {
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numColumns = 1;
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}
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}
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nscoord colWidth;
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if (colStyle->mColumnWidth.GetUnit() == eStyleUnit_Coord) {
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colWidth = colStyle->mColumnWidth.GetCoordValue();
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NS_ASSERTION(colWidth >= 0, "negative column width");
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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 && colGap + colWidth > 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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int32_t maxColumns =
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std::min(nscoord(nsStyleColumn::kMaxColumnCount),
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(availContentWidth + colGap)/(colGap + colWidth));
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numColumns = std::max(1, std::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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} else {
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colWidth = NS_INTRINSICSIZE;
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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 = std::max(1, std::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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if (colGap + colWidth > 0) {
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numColumns = (availContentWidth + colGap)/(colGap + colWidth);
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// The number of columns should never exceed kMaxColumnCount.
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numColumns = std::min(nscoord(nsStyleColumn::kMaxColumnCount),
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numColumns);
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}
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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 =
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std::max(0, 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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if (isBalancing) {
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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 = std::min(mLastBalanceHeight, colHeight);
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} else {
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// This is the case when the column-fill property is set to 'auto'.
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// No balancing, so don't limit the column count
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numColumns = INT32_MAX;
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// XXX_jwir3: If a page's height is set to 0, we could continually
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// create continuations, resulting in an infinite loop, since
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// no progress is ever made. This is an issue with the spec
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// (css3-multicol, css3-page, and css3-break) that is
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// unresolved as of 27 Feb 2013. For the time being, we set this
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// to have a minimum of 1 css px. Once a resolution is made
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// on what minimum to have for a page height, we may need to
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// change this value to match the appropriate spec(s).
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colHeight = std::max(colHeight, nsPresContext::CSSPixelsToAppUnits(1));
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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,
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colHeight, isBalancing, knownFeasibleHeight,
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knownInfeasibleHeight };
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return config;
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}
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bool
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nsColumnSetFrame::ReflowColumns(nsHTMLReflowMetrics& aDesiredSize,
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const nsHTMLReflowState& aReflowState,
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nsReflowStatus& aReflowStatus,
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ReflowConfig& aConfig,
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bool aLastColumnUnbounded,
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nsCollapsingMargin* aCarriedOutBottomMargin,
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ColumnBalanceData& aColData)
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{
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bool feasible = ReflowChildren(aDesiredSize, aReflowState,
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aReflowStatus, aConfig, aLastColumnUnbounded,
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aCarriedOutBottomMargin, aColData);
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if (aColData.mHasExcessHeight) {
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aConfig = ChooseColumnStrategy(aReflowState, true);
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// We need to reflow our children again one last time, otherwise we might
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// end up with a stale column height for some of our columns, since we
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// bailed out of balancing.
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// Return value doesn't matter when !mIsBalancing.
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ReflowChildren(aDesiredSize, aReflowState, aReflowStatus,
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aConfig, aLastColumnUnbounded,
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aCarriedOutBottomMargin, aColData);
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}
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return feasible;
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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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aChild->SetPosition(aOrigin);
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PlaceFrameView(aChild);
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}
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nscoord
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nsColumnSetFrame::GetMinWidth(nsRenderingContext *aRenderingContext) {
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nscoord width = 0;
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DISPLAY_MIN_WIDTH(this, width);
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if (mFrames.FirstChild()) {
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width = mFrames.FirstChild()->GetMinWidth(aRenderingContext);
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}
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const nsStyleColumn* colStyle = StyleColumn();
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nscoord colWidth;
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if (colStyle->mColumnWidth.GetUnit() == eStyleUnit_Coord) {
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colWidth = colStyle->mColumnWidth.GetCoordValue();
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// As available width reduces to zero, we reduce our number of columns
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// to one, and don't enforce the column width, so just return the min
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// of the child's min-width with any specified column width.
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width = std::min(width, colWidth);
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} else {
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NS_ASSERTION(colStyle->mColumnCount > 0,
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"column-count and column-width can't both be auto");
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// As available width reduces to zero, we still have mColumnCount columns,
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// so multiply the child's min-width by the number of columns.
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colWidth = width;
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width *= colStyle->mColumnCount;
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// The multiplication above can make 'width' negative (integer overflow),
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// so use std::max to protect against that.
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width = std::max(width, colWidth);
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}
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// XXX count forced column breaks here? Maybe we should return the child's
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// min-width times the minimum number of columns.
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return width;
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}
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nscoord
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nsColumnSetFrame::GetPrefWidth(nsRenderingContext *aRenderingContext) {
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// Our preferred width is our desired column width, if specified, otherwise
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// the child's preferred width, times the number of columns, plus the width
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// of any required column gaps
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// XXX what about forced column breaks here?
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nscoord result = 0;
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DISPLAY_PREF_WIDTH(this, result);
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const nsStyleColumn* colStyle = StyleColumn();
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nscoord colGap = GetColumnGap(this, colStyle);
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nscoord colWidth;
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if (colStyle->mColumnWidth.GetUnit() == eStyleUnit_Coord) {
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colWidth = colStyle->mColumnWidth.GetCoordValue();
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} else if (mFrames.FirstChild()) {
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colWidth = mFrames.FirstChild()->GetPrefWidth(aRenderingContext);
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} else {
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colWidth = 0;
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}
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int32_t numColumns = colStyle->mColumnCount;
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if (numColumns <= 0) {
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// if column-count is auto, assume one column
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numColumns = 1;
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}
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nscoord width = colWidth*numColumns + colGap*(numColumns - 1);
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// The multiplication above can make 'width' negative (integer overflow),
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// so use std::max to protect against that.
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result = std::max(width, colWidth);
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return result;
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}
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bool
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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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bool aUnboundedLastColumn,
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nsCollapsingMargin* aBottomMarginCarriedOut,
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ColumnBalanceData& aColData)
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{
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aColData.Reset();
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bool allFit = true;
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bool RTL = StyleVisibility()->mDirection == NS_STYLE_DIRECTION_RTL;
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bool shrinkingHeightOnly = !NS_SUBTREE_DIRTY(this) &&
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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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const bool colHeightChanged = mLastBalanceHeight != aConfig.mColMaxHeight;
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if (colHeightChanged) {
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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
|
|
const nsMargin &borderPadding = aReflowState.mComputedBorderPadding;
|
|
|
|
nsRect contentRect(0, 0, 0, 0);
|
|
nsOverflowAreas overflowRects;
|
|
|
|
nsIFrame* child = mFrames.FirstChild();
|
|
nsPoint childOrigin = nsPoint(borderPadding.left, borderPadding.top);
|
|
// For RTL, figure out where the last column's left edge should be. Since the
|
|
// columns might not fill the frame exactly, we need to account for the
|
|
// slop. Otherwise we'll waste time moving the columns by some tiny
|
|
// amount unnecessarily.
|
|
if (RTL) {
|
|
nscoord availWidth = aReflowState.availableWidth;
|
|
if (aReflowState.ComputedWidth() != NS_INTRINSICSIZE) {
|
|
availWidth = aReflowState.ComputedWidth();
|
|
}
|
|
if (availWidth != NS_INTRINSICSIZE) {
|
|
childOrigin.x += availWidth - aConfig.mColWidth;
|
|
#ifdef DEBUG_roc
|
|
printf("*** childOrigin.x = %d\n", childOrigin.x);
|
|
#endif
|
|
}
|
|
}
|
|
int columnCount = 0;
|
|
int contentBottom = 0;
|
|
bool reflowNext = false;
|
|
|
|
while (child) {
|
|
// Try to skip reflowing the child. We can't skip if the child is dirty. We also can't
|
|
// skip if the next column is dirty, because the next column's first line(s)
|
|
// might be pullable back to this column. We can't skip if it's the last child
|
|
// because we need to obtain the bottom margin. We can't skip
|
|
// if this is the last column and we're supposed to assign unbounded
|
|
// height to it, because that could change the available height from
|
|
// the last time we reflowed it and we should try to pull all the
|
|
// content from its next sibling. (Note that it might be the last
|
|
// column, but not be the last child because the desired number of columns
|
|
// has changed.)
|
|
bool skipIncremental = !aReflowState.ShouldReflowAllKids()
|
|
&& !NS_SUBTREE_DIRTY(child)
|
|
&& child->GetNextSibling()
|
|
&& !(aUnboundedLastColumn && columnCount == aConfig.mBalanceColCount - 1)
|
|
&& !NS_SUBTREE_DIRTY(child->GetNextSibling());
|
|
// If we need to pull up content from the prev-in-flow then this is not just
|
|
// a height shrink. The prev in flow will have set the dirty bit.
|
|
// Check the overflow rect YMost instead of just the child's content height. The child
|
|
// may have overflowing content that cares about the available height boundary.
|
|
// (It may also have overflowing content that doesn't care about the available height
|
|
// boundary, but if so, too bad, this optimization is defeated.)
|
|
// We want scrollable overflow here since this is a calculation that
|
|
// affects layout.
|
|
bool skipResizeHeightShrink = shrinkingHeightOnly
|
|
&& child->GetScrollableOverflowRect().YMost() <= aConfig.mColMaxHeight;
|
|
|
|
nscoord childContentBottom = 0;
|
|
if (!reflowNext && (skipIncremental || skipResizeHeightShrink)) {
|
|
// This child does not need to be reflowed, but we may need to move it
|
|
MoveChildTo(this, child, childOrigin);
|
|
|
|
// If this is the last frame then make sure we get the right status
|
|
nsIFrame* kidNext = child->GetNextSibling();
|
|
if (kidNext) {
|
|
aStatus = (kidNext->GetStateBits() & NS_FRAME_IS_OVERFLOW_CONTAINER)
|
|
? NS_FRAME_OVERFLOW_INCOMPLETE
|
|
: NS_FRAME_NOT_COMPLETE;
|
|
} else {
|
|
aStatus = mLastFrameStatus;
|
|
}
|
|
childContentBottom = nsLayoutUtils::CalculateContentBottom(child);
|
|
#ifdef DEBUG_roc
|
|
printf("*** Skipping child #%d %p (incremental %d, resize height shrink %d): status = %d\n",
|
|
columnCount, (void*)child, skipIncremental, skipResizeHeightShrink, aStatus);
|
|
#endif
|
|
} else {
|
|
nsSize availSize(aConfig.mColWidth, aConfig.mColMaxHeight);
|
|
|
|
if (aUnboundedLastColumn && columnCount == aConfig.mBalanceColCount - 1) {
|
|
availSize.height = GetAvailableContentHeight(aReflowState);
|
|
}
|
|
|
|
if (reflowNext)
|
|
child->AddStateBits(NS_FRAME_IS_DIRTY);
|
|
|
|
nsHTMLReflowState kidReflowState(PresContext(), aReflowState, child,
|
|
availSize, availSize.width,
|
|
aReflowState.ComputedHeight());
|
|
kidReflowState.mFlags.mIsTopOfPage = true;
|
|
kidReflowState.mFlags.mTableIsSplittable = false;
|
|
kidReflowState.mFlags.mIsColumnBalancing = aConfig.mBalanceColCount < INT32_MAX;
|
|
|
|
// We need to reflow any float placeholders, even if our column height
|
|
// hasn't changed.
|
|
kidReflowState.mFlags.mMustReflowPlaceholders = !colHeightChanged;
|
|
|
|
#ifdef DEBUG_roc
|
|
printf("*** Reflowing child #%d %p: availHeight=%d\n",
|
|
columnCount, (void*)child,availSize.height);
|
|
#endif
|
|
|
|
// Note if the column's next in flow is not being changed by this incremental reflow.
|
|
// This may allow the current column to avoid trying to pull lines from the next column.
|
|
if (child->GetNextSibling() &&
|
|
!(GetStateBits() & NS_FRAME_IS_DIRTY) &&
|
|
!(child->GetNextSibling()->GetStateBits() & NS_FRAME_IS_DIRTY)) {
|
|
kidReflowState.mFlags.mNextInFlowUntouched = true;
|
|
}
|
|
|
|
nsHTMLReflowMetrics kidDesiredSize(aDesiredSize.mFlags);
|
|
|
|
// XXX it would be cool to consult the float manager for the
|
|
// previous block to figure out the region of floats from the
|
|
// previous column that extend into this column, and subtract
|
|
// that region from the new float manager. So you could stick a
|
|
// really big float in the first column and text in following
|
|
// columns would flow around it.
|
|
|
|
// Reflow the frame
|
|
ReflowChild(child, PresContext(), kidDesiredSize, kidReflowState,
|
|
childOrigin.x + kidReflowState.mComputedMargin.left,
|
|
childOrigin.y + kidReflowState.mComputedMargin.top,
|
|
0, aStatus);
|
|
|
|
reflowNext = (aStatus & NS_FRAME_REFLOW_NEXTINFLOW) != 0;
|
|
|
|
#ifdef DEBUG_roc
|
|
printf("*** Reflowed child #%d %p: status = %d, desiredSize=%d,%d CarriedOutBottomMargin=%d\n",
|
|
columnCount, (void*)child, aStatus, kidDesiredSize.width, kidDesiredSize.height,
|
|
kidDesiredSize.mCarriedOutBottomMargin.get());
|
|
#endif
|
|
|
|
NS_FRAME_TRACE_REFLOW_OUT("Column::Reflow", aStatus);
|
|
|
|
*aBottomMarginCarriedOut = kidDesiredSize.mCarriedOutBottomMargin;
|
|
|
|
FinishReflowChild(child, PresContext(), &kidReflowState,
|
|
kidDesiredSize, childOrigin.x, childOrigin.y, 0);
|
|
|
|
childContentBottom = nsLayoutUtils::CalculateContentBottom(child);
|
|
if (childContentBottom > aConfig.mColMaxHeight) {
|
|
allFit = false;
|
|
}
|
|
if (childContentBottom > availSize.height) {
|
|
aColData.mMaxOverflowingHeight = std::max(childContentBottom,
|
|
aColData.mMaxOverflowingHeight);
|
|
}
|
|
}
|
|
|
|
contentRect.UnionRect(contentRect, child->GetRect());
|
|
|
|
ConsiderChildOverflow(overflowRects, child);
|
|
contentBottom = std::max(contentBottom, childContentBottom);
|
|
aColData.mLastHeight = childContentBottom;
|
|
aColData.mSumHeight += childContentBottom;
|
|
|
|
// Build a continuation column if necessary
|
|
nsIFrame* kidNextInFlow = child->GetNextInFlow();
|
|
|
|
if (NS_FRAME_IS_FULLY_COMPLETE(aStatus) && !NS_FRAME_IS_TRUNCATED(aStatus)) {
|
|
NS_ASSERTION(!kidNextInFlow, "next in flow should have been deleted");
|
|
child = nullptr;
|
|
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(PresContext(), child, kidNextInFlow);
|
|
|
|
if (NS_FAILED(rv)) {
|
|
NS_NOTREACHED("Couldn't create continuation");
|
|
child = nullptr;
|
|
break;
|
|
}
|
|
}
|
|
|
|
// Make sure we reflow a next-in-flow when it switches between being
|
|
// normal or overflow container
|
|
if (NS_FRAME_OVERFLOW_IS_INCOMPLETE(aStatus)) {
|
|
if (!(kidNextInFlow->GetStateBits() & NS_FRAME_IS_OVERFLOW_CONTAINER)) {
|
|
aStatus |= NS_FRAME_REFLOW_NEXTINFLOW;
|
|
reflowNext = true;
|
|
kidNextInFlow->AddStateBits(NS_FRAME_IS_OVERFLOW_CONTAINER);
|
|
}
|
|
}
|
|
else if (kidNextInFlow->GetStateBits() & NS_FRAME_IS_OVERFLOW_CONTAINER) {
|
|
aStatus |= NS_FRAME_REFLOW_NEXTINFLOW;
|
|
reflowNext = true;
|
|
kidNextInFlow->RemoveStateBits(NS_FRAME_IS_OVERFLOW_CONTAINER);
|
|
}
|
|
|
|
if ((contentBottom > aReflowState.mComputedMaxHeight ||
|
|
contentBottom > aReflowState.ComputedHeight()) &&
|
|
aConfig.mBalanceColCount < INT32_MAX) {
|
|
// We overflowed vertically, but have not exceeded the number of
|
|
// columns. We're going to go into overflow columns now, so balancing
|
|
// no longer applies.
|
|
aColData.mHasExcessHeight = true;
|
|
}
|
|
|
|
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.
|
|
const nsFrameList& continuationColumns = mFrames.RemoveFramesAfter(child);
|
|
if (continuationColumns.NotEmpty()) {
|
|
SetOverflowFrames(PresContext(), continuationColumns);
|
|
}
|
|
child = nullptr;
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (PresContext()->HasPendingInterrupt()) {
|
|
// Stop the loop now while |child| still points to the frame that bailed
|
|
// out. We could keep going here and condition a bunch of the code in
|
|
// this loop on whether there's an interrupt, or even just keep going and
|
|
// trying to reflow the blocks (even though we know they'll interrupt
|
|
// right after their first line), but stopping now is conceptually the
|
|
// simplest (and probably fastest) thing.
|
|
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 (PresContext()->CheckForInterrupt(this) &&
|
|
(GetStateBits() & NS_FRAME_IS_DIRTY)) {
|
|
// Mark all our kids starting with |child| dirty
|
|
|
|
// Note that this is a CheckForInterrupt call, not a HasPendingInterrupt,
|
|
// because we might have interrupted while reflowing |child|, and since
|
|
// we're about to add a dirty bit to |child| we need to make sure that
|
|
// |this| is scheduled to have dirty bits marked on it and its ancestors.
|
|
// Otherwise, when we go to mark dirty bits on |child|'s ancestors we'll
|
|
// bail out immediately, since it'll already have a dirty bit.
|
|
for (; child; child = child->GetNextSibling()) {
|
|
child->AddStateBits(NS_FRAME_IS_DIRTY);
|
|
}
|
|
}
|
|
|
|
aColData.mMaxHeight = contentBottom;
|
|
contentRect.height = std::max(contentRect.height, contentBottom);
|
|
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.ComputedHeight() != NS_INTRINSICSIZE) {
|
|
contentSize.height = aReflowState.ComputedHeight();
|
|
} else {
|
|
if (NS_UNCONSTRAINEDSIZE != aReflowState.mComputedMaxHeight) {
|
|
contentSize.height = std::min(aReflowState.mComputedMaxHeight, contentSize.height);
|
|
}
|
|
if (NS_UNCONSTRAINEDSIZE != aReflowState.mComputedMinHeight) {
|
|
contentSize.height = std::max(aReflowState.mComputedMinHeight, contentSize.height);
|
|
}
|
|
}
|
|
if (aReflowState.ComputedWidth() != NS_INTRINSICSIZE) {
|
|
contentSize.width = aReflowState.ComputedWidth();
|
|
} else {
|
|
if (NS_UNCONSTRAINEDSIZE != aReflowState.mComputedMaxWidth) {
|
|
contentSize.width = std::min(aReflowState.mComputedMaxWidth, contentSize.width);
|
|
}
|
|
if (NS_UNCONSTRAINEDSIZE != aReflowState.mComputedMinWidth) {
|
|
contentSize.width = std::max(aReflowState.mComputedMinWidth, contentSize.width);
|
|
}
|
|
}
|
|
|
|
aDesiredSize.height = borderPadding.top + contentSize.height +
|
|
borderPadding.bottom;
|
|
aDesiredSize.width = contentSize.width + borderPadding.left + borderPadding.right;
|
|
aDesiredSize.mOverflowAreas = overflowRects;
|
|
aDesiredSize.UnionOverflowAreasWithDesiredBounds();
|
|
|
|
#ifdef DEBUG_roc
|
|
printf("*** DONE PASS feasible=%d\n", allFit && NS_FRAME_IS_FULLY_COMPLETE(aStatus)
|
|
&& !NS_FRAME_IS_TRUNCATED(aStatus));
|
|
#endif
|
|
return allFit && NS_FRAME_IS_FULLY_COMPLETE(aStatus)
|
|
&& !NS_FRAME_IS_TRUNCATED(aStatus);
|
|
}
|
|
|
|
void
|
|
nsColumnSetFrame::DrainOverflowColumns()
|
|
{
|
|
// First grab the prev-in-flows overflows and reparent them to this
|
|
// frame.
|
|
nsPresContext* presContext = PresContext();
|
|
nsColumnSetFrame* prev = static_cast<nsColumnSetFrame*>(GetPrevInFlow());
|
|
if (prev) {
|
|
AutoFrameListPtr overflows(presContext, prev->StealOverflowFrames());
|
|
if (overflows) {
|
|
nsContainerFrame::ReparentFrameViewList(presContext, *overflows,
|
|
prev, this);
|
|
|
|
mFrames.InsertFrames(this, nullptr, *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.
|
|
AutoFrameListPtr overflows(presContext, StealOverflowFrames());
|
|
if (overflows) {
|
|
// We're already the parent for these frames, so no need to set
|
|
// their parent again.
|
|
mFrames.AppendFrames(nullptr, *overflows);
|
|
}
|
|
}
|
|
|
|
NS_IMETHODIMP
|
|
nsColumnSetFrame::Reflow(nsPresContext* aPresContext,
|
|
nsHTMLReflowMetrics& aDesiredSize,
|
|
const nsHTMLReflowState& aReflowState,
|
|
nsReflowStatus& aStatus)
|
|
{
|
|
// Don't support interruption in columns
|
|
nsPresContext::InterruptPreventer noInterrupts(aPresContext);
|
|
|
|
DO_GLOBAL_REFLOW_COUNT("nsColumnSetFrame");
|
|
DISPLAY_REFLOW(aPresContext, this, aReflowState, aDesiredSize, aStatus);
|
|
|
|
// Initialize OUT parameter
|
|
aStatus = NS_FRAME_COMPLETE;
|
|
|
|
// Our children depend on our height if we have a fixed height.
|
|
if (aReflowState.ComputedHeight() != NS_AUTOHEIGHT) {
|
|
NS_ASSERTION(aReflowState.ComputedHeight() != NS_INTRINSICSIZE,
|
|
"Unexpected mComputedHeight");
|
|
AddStateBits(NS_FRAME_CONTAINS_RELATIVE_HEIGHT);
|
|
}
|
|
else {
|
|
RemoveStateBits(NS_FRAME_CONTAINS_RELATIVE_HEIGHT);
|
|
}
|
|
|
|
//------------ Handle Incremental Reflow -----------------
|
|
|
|
ReflowConfig config = ChooseColumnStrategy(aReflowState);
|
|
|
|
// 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();
|
|
bool unboundedLastColumn = config.mIsBalancing && !nextInFlow;
|
|
nsCollapsingMargin carriedOutBottomMargin;
|
|
ColumnBalanceData colData;
|
|
colData.mHasExcessHeight = false;
|
|
|
|
bool feasible = ReflowColumns(aDesiredSize, aReflowState, aStatus, config,
|
|
unboundedLastColumn, &carriedOutBottomMargin,
|
|
colData);
|
|
|
|
if (config.mIsBalancing && !aPresContext->HasPendingInterrupt()) {
|
|
nscoord availableContentHeight = GetAvailableContentHeight(aReflowState);
|
|
|
|
// Termination of the algorithm below is guaranteed because
|
|
// config.mKnownFeasibleHeight - config.mKnownInfeasibleHeight decreases
|
|
// in every iteration.
|
|
|
|
// 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)
|
|
bool maybeContinuousBreakingDetected = false;
|
|
|
|
while (!aPresContext->HasPendingInterrupt()) {
|
|
nscoord lastKnownFeasibleHeight = config.mKnownFeasibleHeight;
|
|
|
|
// Record what we learned from the last reflow
|
|
if (feasible) {
|
|
// maxHeight is feasible. Also, mLastBalanceHeight is feasible.
|
|
config.mKnownFeasibleHeight = std::min(config.mKnownFeasibleHeight,
|
|
colData.mMaxHeight);
|
|
config.mKnownFeasibleHeight = std::min(config.mKnownFeasibleHeight,
|
|
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) {
|
|
config.mKnownInfeasibleHeight =
|
|
std::max(config.mKnownInfeasibleHeight, colData.mLastHeight - 1);
|
|
}
|
|
} else {
|
|
config.mKnownInfeasibleHeight =
|
|
std::max(config.mKnownInfeasibleHeight, mLastBalanceHeight);
|
|
// If a column didn't fit in its available height, then its current
|
|
// height must be the minimum height for unbreakable content in
|
|
// the column, and therefore no smaller height can be feasible.
|
|
config.mKnownInfeasibleHeight =
|
|
std::max(config.mKnownInfeasibleHeight,
|
|
colData.mMaxOverflowingHeight - 1);
|
|
|
|
if (unboundedLastColumn) {
|
|
// The last column is unbounded, so all content got reflowed, so the
|
|
// mColMaxHeight is feasible.
|
|
config.mKnownFeasibleHeight = std::min(config.mKnownFeasibleHeight,
|
|
colData.mMaxHeight);
|
|
}
|
|
}
|
|
|
|
#ifdef DEBUG_roc
|
|
printf("*** nsColumnSetFrame::Reflow balancing knownInfeasible=%d knownFeasible=%d\n",
|
|
config.mKnownInfeasibleHeight, config.mKnownFeasibleHeight);
|
|
#endif
|
|
|
|
|
|
if (config.mKnownInfeasibleHeight >= config.mKnownFeasibleHeight - 1) {
|
|
// config.mKnownFeasibleHeight is where we want to be
|
|
break;
|
|
|
|
}
|
|
if (config.mKnownInfeasibleHeight >= availableContentHeight) {
|
|
break;
|
|
}
|
|
|
|
if (lastKnownFeasibleHeight - config.mKnownFeasibleHeight == 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 = true;
|
|
}
|
|
|
|
nscoord nextGuess =
|
|
(config.mKnownFeasibleHeight + config.mKnownInfeasibleHeight)/2;
|
|
// The constant of 600 twips is arbitrary. It's about two line-heights.
|
|
if (config.mKnownFeasibleHeight - 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 = config.mKnownFeasibleHeight - 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 = colData.mSumHeight/config.mBalanceColCount + 600;
|
|
// Sanitize it
|
|
nextGuess = clamped(nextGuess, config.mKnownInfeasibleHeight + 1,
|
|
config.mKnownFeasibleHeight - 1);
|
|
} else if (config.mKnownFeasibleHeight == 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 = config.mKnownInfeasibleHeight*2 + 600;
|
|
}
|
|
// Don't bother guessing more than our height constraint.
|
|
nextGuess = std::min(availableContentHeight, nextGuess);
|
|
|
|
#ifdef DEBUG_roc
|
|
printf("*** nsColumnSetFrame::Reflow balancing choosing next guess=%d\n", nextGuess);
|
|
#endif
|
|
|
|
config.mColMaxHeight = nextGuess;
|
|
|
|
unboundedLastColumn = false;
|
|
AddStateBits(NS_FRAME_IS_DIRTY);
|
|
feasible = ReflowColumns(aDesiredSize, aReflowState, aStatus, config, false,
|
|
&carriedOutBottomMargin, colData);
|
|
|
|
if (!config.mIsBalancing) {
|
|
// Looks like we had excess height when balancing, so we gave up on
|
|
// trying to balance.
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (config.mIsBalancing && !feasible &&
|
|
!aPresContext->HasPendingInterrupt()) {
|
|
// We may need to reflow one more time at the feasible height to
|
|
// get a valid layout.
|
|
bool skip = false;
|
|
if (config.mKnownInfeasibleHeight >= availableContentHeight) {
|
|
config.mColMaxHeight = availableContentHeight;
|
|
if (mLastBalanceHeight == availableContentHeight) {
|
|
skip = true;
|
|
}
|
|
} else {
|
|
config.mColMaxHeight = config.mKnownFeasibleHeight;
|
|
}
|
|
if (!skip) {
|
|
// If our height is unconstrained, make sure that the last column is
|
|
// allowed to have arbitrary height here, even though we were balancing.
|
|
// Otherwise we'd have to split, and it's not clear what we'd do with
|
|
// that.
|
|
AddStateBits(NS_FRAME_IS_DIRTY);
|
|
ReflowColumns(aDesiredSize, aReflowState, aStatus, config,
|
|
availableContentHeight == NS_UNCONSTRAINEDSIZE,
|
|
&carriedOutBottomMargin, colData);
|
|
}
|
|
}
|
|
}
|
|
|
|
if (aPresContext->HasPendingInterrupt() &&
|
|
aReflowState.availableHeight == NS_UNCONSTRAINEDSIZE) {
|
|
// In this situation, we might be lying about our reflow status, because
|
|
// our last kid (the one that got interrupted) was incomplete. Fix that.
|
|
aStatus = NS_FRAME_COMPLETE;
|
|
}
|
|
|
|
FinishReflowWithAbsoluteFrames(aPresContext, aDesiredSize, aReflowState, aStatus, false);
|
|
|
|
aDesiredSize.mCarriedOutBottomMargin = carriedOutBottomMargin;
|
|
|
|
NS_FRAME_SET_TRUNCATION(aStatus, aReflowState, aDesiredSize);
|
|
|
|
NS_ASSERTION(NS_FRAME_IS_FULLY_COMPLETE(aStatus) ||
|
|
aReflowState.availableHeight != NS_UNCONSTRAINEDSIZE,
|
|
"Column set should be complete if the available height is unconstrained");
|
|
|
|
return NS_OK;
|
|
}
|
|
|
|
void
|
|
nsColumnSetFrame::BuildDisplayList(nsDisplayListBuilder* aBuilder,
|
|
const nsRect& aDirtyRect,
|
|
const nsDisplayListSet& aLists) {
|
|
DisplayBorderBackgroundOutline(aBuilder, aLists);
|
|
|
|
aLists.BorderBackground()->AppendNewToTop(new (aBuilder)
|
|
nsDisplayGeneric(aBuilder, this, ::PaintColumnRule, "ColumnRule",
|
|
nsDisplayItem::TYPE_COLUMN_RULE));
|
|
|
|
// Our children won't have backgrounds so it doesn't matter where we put them.
|
|
for (nsFrameList::Enumerator e(mFrames); !e.AtEnd(); e.Next()) {
|
|
BuildDisplayListForChild(aBuilder, e.get(), aDirtyRect, aLists);
|
|
}
|
|
}
|
|
|
|
NS_IMETHODIMP
|
|
nsColumnSetFrame::AppendFrames(ChildListID aListID,
|
|
nsFrameList& aFrameList)
|
|
{
|
|
if (aListID == kAbsoluteList) {
|
|
return nsContainerFrame::AppendFrames(aListID, aFrameList);
|
|
}
|
|
|
|
NS_ERROR("unexpected child list");
|
|
return NS_ERROR_INVALID_ARG;
|
|
}
|
|
|
|
NS_IMETHODIMP
|
|
nsColumnSetFrame::InsertFrames(ChildListID aListID,
|
|
nsIFrame* aPrevFrame,
|
|
nsFrameList& aFrameList)
|
|
{
|
|
if (aListID == kAbsoluteList) {
|
|
return nsContainerFrame::InsertFrames(aListID, aPrevFrame, aFrameList);
|
|
}
|
|
|
|
NS_ERROR("unexpected child list");
|
|
return NS_ERROR_INVALID_ARG;
|
|
}
|
|
|
|
NS_IMETHODIMP
|
|
nsColumnSetFrame::RemoveFrame(ChildListID aListID,
|
|
nsIFrame* aOldFrame)
|
|
{
|
|
if (aListID == kAbsoluteList) {
|
|
return nsContainerFrame::RemoveFrame(aListID, aOldFrame);
|
|
}
|
|
|
|
NS_ERROR("unexpected child list");
|
|
return NS_ERROR_INVALID_ARG;
|
|
}
|