зеркало из https://github.com/mozilla/gecko-dev.git
1040 строки
37 KiB
C++
1040 строки
37 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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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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/*
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* rendering object for CSS display:block, inline-block, and list-item
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* boxes, also used for various anonymous boxes
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*/
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#ifndef nsBlockFrame_h___
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#define nsBlockFrame_h___
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#include "nsContainerFrame.h"
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#include "nsHTMLParts.h"
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#include "nsLineBox.h"
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#include "nsCSSPseudoElements.h"
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#include "nsFloatManager.h"
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enum class LineReflowStatus {
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// The line was completely reflowed and fit in available width, and we should
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// try to pull up content from the next line if possible.
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OK,
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// The line was completely reflowed and fit in available width, but we should
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// not try to pull up content from the next line.
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Stop,
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// We need to reflow the line again at its current vertical position. The
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// new reflow should not try to pull up any frames from the next line.
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RedoNoPull,
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// We need to reflow the line again using the floats from its height
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// this reflow, since its height made it hit floats that were not
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// adjacent to its top.
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RedoMoreFloats,
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// We need to reflow the line again at a lower vertical postion where there
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// may be more horizontal space due to different float configuration.
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RedoNextBand,
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// The line did not fit in the available vertical space. Try pushing it to
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// the next page or column if it's not the first line on the current
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// page/column.
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Truncated
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};
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class nsBlockInFlowLineIterator;
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namespace mozilla {
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class BlockReflowInput;
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class PresShell;
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class ServoRestyleState;
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class ServoStyleSet;
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} // namespace mozilla
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/**
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* Some invariants:
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* -- The overflow out-of-flows list contains the out-of-
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* flow frames whose placeholders are in the overflow list.
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* -- A given piece of content has at most one placeholder
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* frame in a block's normal child list.
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* -- While a block is being reflowed, and from then until
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* its next-in-flow is reflowed it may have a
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* PushedFloatProperty frame property that points to
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* an nsFrameList. This list contains continuations for
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* floats whose prev-in-flow is in the block's regular float
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* list and first-in-flows of floats that did not fit, but
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* whose placeholders are in the block or one of its
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* prev-in-flows.
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* -- In all these frame lists, if there are two frames for
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* the same content appearing in the list, then the frames
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* appear with the prev-in-flow before the next-in-flow.
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* -- While reflowing a block, its overflow line list
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* will usually be empty but in some cases will have lines
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* (while we reflow the block at its shrink-wrap width).
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* In this case any new overflowing content must be
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* prepended to the overflow lines.
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*/
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/*
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* Base class for block and inline frames.
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* The block frame has an additional child list, kAbsoluteList, which
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* contains the absolutely positioned frames.
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*/
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class nsBlockFrame : public nsContainerFrame {
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using BlockReflowInput = mozilla::BlockReflowInput;
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public:
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NS_DECL_FRAMEARENA_HELPERS(nsBlockFrame)
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typedef nsLineList::iterator LineIterator;
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typedef nsLineList::const_iterator ConstLineIterator;
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typedef nsLineList::reverse_iterator ReverseLineIterator;
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typedef nsLineList::const_reverse_iterator ConstReverseLineIterator;
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LineIterator LinesBegin() { return mLines.begin(); }
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LineIterator LinesEnd() { return mLines.end(); }
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ConstLineIterator LinesBegin() const { return mLines.begin(); }
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ConstLineIterator LinesEnd() const { return mLines.end(); }
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ReverseLineIterator LinesRBegin() { return mLines.rbegin(); }
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ReverseLineIterator LinesREnd() { return mLines.rend(); }
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ConstReverseLineIterator LinesRBegin() const { return mLines.rbegin(); }
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ConstReverseLineIterator LinesREnd() const { return mLines.rend(); }
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LineIterator LinesBeginFrom(nsLineBox* aList) { return mLines.begin(aList); }
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ReverseLineIterator LinesRBeginFrom(nsLineBox* aList) {
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return mLines.rbegin(aList);
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}
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friend nsBlockFrame* NS_NewBlockFrame(mozilla::PresShell* aPresShell,
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ComputedStyle* aStyle);
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// nsQueryFrame
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NS_DECL_QUERYFRAME
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// nsIFrame
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void Init(nsIContent* aContent, nsContainerFrame* aParent,
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nsIFrame* aPrevInFlow) override;
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void SetInitialChildList(ChildListID aListID,
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nsFrameList& aChildList) override;
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void AppendFrames(ChildListID aListID, nsFrameList& aFrameList) override;
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void InsertFrames(ChildListID aListID, nsIFrame* aPrevFrame,
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nsFrameList& aFrameList) override;
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void RemoveFrame(ChildListID aListID, nsIFrame* aOldFrame) override;
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const nsFrameList& GetChildList(ChildListID aListID) const override;
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void GetChildLists(nsTArray<ChildList>* aLists) const override;
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nscoord GetLogicalBaseline(mozilla::WritingMode aWritingMode) const override;
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bool GetVerticalAlignBaseline(mozilla::WritingMode aWM,
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nscoord* aBaseline) const override {
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NS_ASSERTION(!aWM.IsOrthogonalTo(GetWritingMode()),
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"You should only call this on frames with a WM that's "
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"parallel to aWM");
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nscoord lastBaseline;
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if (GetNaturalBaselineBOffset(aWM, BaselineSharingGroup::Last,
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&lastBaseline)) {
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*aBaseline = BSize() - lastBaseline;
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return true;
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}
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return false;
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}
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bool GetNaturalBaselineBOffset(mozilla::WritingMode aWM,
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BaselineSharingGroup aBaselineGroup,
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nscoord* aBaseline) const override;
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nscoord GetCaretBaseline() const override;
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void DestroyFrom(nsIFrame* aDestructRoot,
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PostDestroyData& aPostDestroyData) override;
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bool IsFloatContainingBlock() const override;
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void BuildDisplayList(nsDisplayListBuilder* aBuilder,
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const nsDisplayListSet& aLists) override;
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bool IsFrameOfType(uint32_t aFlags) const override {
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return nsContainerFrame::IsFrameOfType(
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aFlags & ~(nsIFrame::eCanContainOverflowContainers));
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}
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void InvalidateFrame(uint32_t aDisplayItemKey = 0,
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bool aRebuildDisplayItems = true) override;
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void InvalidateFrameWithRect(const nsRect& aRect,
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uint32_t aDisplayItemKey = 0,
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bool aRebuildDisplayItems = true) override;
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#ifdef DEBUG_FRAME_DUMP
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void List(FILE* out = stderr, const char* aPrefix = "",
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uint32_t aFlags = 0) const override;
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nsresult GetFrameName(nsAString& aResult) const override;
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#endif
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#ifdef DEBUG
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const char* LineReflowStatusToString(
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LineReflowStatus aLineReflowStatus) const;
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#endif
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#ifdef ACCESSIBILITY
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mozilla::a11y::AccType AccessibleType() override;
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#endif
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// Line cursor methods to speed up line searching in which one query
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// result is expected to be close to the next in general. This is
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// mainly for searching line(s) containing a point. It is also used
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// as a cache for local computation. Use AutoLineCursorSetup for the
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// latter case so that it wouldn't interact unexpectedly with the
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// former. The basic idea for the former is that we set the cursor
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// property if the lines' overflowArea.VisualOverflow().ys and
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// overflowArea.VisualOverflow().yMosts are non-decreasing
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// (considering only non-empty overflowArea.VisualOverflow()s; empty
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// overflowArea.VisualOverflow()s never participate in event handling
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// or painting), and the block has sufficient number of lines. The
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// cursor property points to a "recently used" line. If we get a
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// series of requests that work on lines
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// "near" the cursor, then we can find those nearby lines quickly by
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// starting our search at the cursor.
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// Clear out line cursor because we're disturbing the lines (i.e., Reflow)
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void ClearLineCursor();
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// Get the first line that might contain y-coord 'y', or nullptr if you must
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// search all lines. If nonnull is returned then we guarantee that the lines'
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// combinedArea.ys and combinedArea.yMosts are non-decreasing.
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// The actual line returned might not contain 'y', but if not, it is
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// guaranteed to be before any line which does contain 'y'.
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nsLineBox* GetFirstLineContaining(nscoord y);
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// Set the line cursor to our first line. Only call this if you
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// guarantee that either the lines' combinedArea.ys and combinedArea.
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// yMosts are non-decreasing, or the line cursor is cleared before
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// building the display list of this frame.
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void SetupLineCursor();
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/**
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* Helper RAII class for automatically set and clear line cursor for
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* temporary use. If the frame already has line cursor, this would be
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* a no-op.
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*/
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class MOZ_STACK_CLASS AutoLineCursorSetup {
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public:
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explicit AutoLineCursorSetup(nsBlockFrame* aFrame)
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: mFrame(aFrame), mOrigCursor(aFrame->GetLineCursor()) {
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if (!mOrigCursor) {
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mFrame->SetupLineCursor();
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}
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}
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~AutoLineCursorSetup() {
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if (mOrigCursor) {
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mFrame->SetProperty(LineCursorProperty(), mOrigCursor);
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} else {
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mFrame->ClearLineCursor();
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}
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}
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private:
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nsBlockFrame* mFrame;
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nsLineBox* mOrigCursor;
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};
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void ChildIsDirty(nsIFrame* aChild) override;
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bool IsEmpty() override;
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bool CachedIsEmpty() override;
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bool IsSelfEmpty() override;
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// Given that we have a ::marker frame, does it actually draw something, i.e.,
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// do we have either a 'list-style-type' or 'list-style-image' that is
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// not 'none', and no 'content'?
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bool MarkerIsEmpty() const;
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#ifdef ACCESSIBILITY
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/**
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* Return the ::marker text equivalent, without flushing.
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*/
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void GetSpokenMarkerText(nsAString& aText) const;
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#endif
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/**
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* Return true if this frame has a ::marker frame.
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*/
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bool HasMarker() const { return HasOutsideMarker() || HasInsideMarker(); }
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/**
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* @return true if this frame has an inside ::marker frame.
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*/
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bool HasInsideMarker() const {
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return 0 != (mState & NS_BLOCK_FRAME_HAS_INSIDE_MARKER);
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}
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/**
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* @return true if this frame has an outside ::marker frame.
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*/
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bool HasOutsideMarker() const {
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return 0 != (mState & NS_BLOCK_FRAME_HAS_OUTSIDE_MARKER);
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}
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/**
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* @return the ::marker frame or nullptr if we don't have one.
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*/
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nsIFrame* GetMarker() const {
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nsIFrame* outside = GetOutsideMarker();
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return outside ? outside : GetInsideMarker();
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}
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/**
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* @return the first-letter frame or nullptr if we don't have one.
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*/
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nsIFrame* GetFirstLetter() const;
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/**
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* @return the ::first-line frame or nullptr if we don't have one.
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*/
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nsIFrame* GetFirstLineFrame() const;
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void MarkIntrinsicISizesDirty() override;
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private:
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void CheckIntrinsicCacheAgainstShrinkWrapState();
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public:
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nscoord GetMinISize(gfxContext* aRenderingContext) override;
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nscoord GetPrefISize(gfxContext* aRenderingContext) override;
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nsRect ComputeTightBounds(DrawTarget* aDrawTarget) const override;
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nsresult GetPrefWidthTightBounds(gfxContext* aContext, nscoord* aX,
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nscoord* aXMost) override;
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/**
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* Compute the final block size of this frame.
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*
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* @param aReflowInput Data structure passed from parent during reflow.
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* @param aReflowStatus A pointer to the reflow status for when we're finished
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* doing reflow. this will get set appropriately if the block-size
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* causes us to exceed the current available (page) block-size.
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* @param aContentBSize The block-size of content, precomputed outside of this
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* function. The final block-size that is used in aMetrics will be set
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* to either this or the available block-size, whichever is larger, in
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* the case where our available block-size is constrained, and we
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* overflow that available block-size.
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* @param aBorderPadding The margins representing the border padding for block
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* frames. Can be 0.
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* @param aFinalSize Out parameter for final block-size.
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* @param aConsumed The block-size already consumed by our previous-in-flows.
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*/
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void ComputeFinalBSize(const ReflowInput& aReflowInput,
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nsReflowStatus* aStatus, nscoord aContentBSize,
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const mozilla::LogicalMargin& aBorderPadding,
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mozilla::LogicalSize& aFinalSize, nscoord aConsumed);
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void Reflow(nsPresContext* aPresContext, ReflowOutput& aDesiredSize,
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const ReflowInput& aReflowInput,
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nsReflowStatus& aStatus) override;
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/**
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* Move any frames on our overflow list to the end of our principal list.
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* @return true if there were any overflow frames
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*/
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bool DrainSelfOverflowList() override;
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nsresult StealFrame(nsIFrame* aChild) override;
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void DeleteNextInFlowChild(nsIFrame* aNextInFlow,
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bool aDeletingEmptyFrames) override;
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/**
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* This is a special method that allows a child class of nsBlockFrame to
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* return a special, customized nsStyleText object to the nsLineLayout
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* constructor. It is used when the nsBlockFrame child needs to specify its
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* custom rendering style.
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*/
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virtual const nsStyleText* StyleTextForLineLayout();
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/**
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* Determines whether the collapsed margin carried out of the last
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* line includes the margin-top of a line with clearance (in which
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* case we must avoid collapsing that margin with our bottom margin)
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*/
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bool CheckForCollapsedBEndMarginFromClearanceLine();
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static nsresult GetCurrentLine(BlockReflowInput* aState,
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nsLineBox** aOutCurrentLine);
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/**
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* Determine if this block is a margin root at the top/bottom edges.
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*/
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void IsMarginRoot(bool* aBStartMarginRoot, bool* aBEndMarginRoot);
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static bool BlockNeedsFloatManager(nsIFrame* aBlock);
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/**
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* Returns whether aFrame is a block frame that will wrap its contents
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* around floats intruding on it from the outside. (aFrame need not
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* be a block frame, but if it's not, the result will be false.)
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*/
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static bool BlockCanIntersectFloats(nsIFrame* aFrame);
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/**
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* Returns the inline size that needs to be cleared past floats for
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* blocks that cannot intersect floats. aState must already have
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* GetFloatAvailableSpace called on it for the block-dir position that we
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* care about (which need not be its current mBCoord)
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*/
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struct ReplacedElementISizeToClear {
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// Note that we care about the inline-start margin but can ignore
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// the inline-end margin.
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nscoord marginIStart, borderBoxISize;
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};
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static ReplacedElementISizeToClear ISizeToClearPastFloats(
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const BlockReflowInput& aState,
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const mozilla::LogicalRect& aFloatAvailableSpace, nsIFrame* aFrame);
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/**
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* Creates a contination for aFloat and adds it to the list of overflow
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* floats. Also updates aState.mReflowStatus to include the float's
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* incompleteness. Must only be called while this block frame is in reflow.
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* aFloatStatus must be the float's true, unmodified reflow status.
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*/
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void SplitFloat(BlockReflowInput& aState, nsIFrame* aFloat,
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const nsReflowStatus& aFloatStatus);
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/**
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* Walks up the frame tree, starting with aCandidate, and returns the first
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* block frame that it encounters.
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*/
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static nsBlockFrame* GetNearestAncestorBlock(nsIFrame* aCandidate);
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struct FrameLines {
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nsLineList mLines;
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nsFrameList mFrames;
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};
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/**
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* Update the styles of our various pseudo-elements (marker, first-line,
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* etc, but _not_ first-letter).
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*/
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void UpdatePseudoElementStyles(mozilla::ServoRestyleState& aRestyleState);
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// Update our first-letter styles during stylo post-traversal. This needs to
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// be done at a slightly different time than our other pseudo-elements.
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void UpdateFirstLetterStyle(mozilla::ServoRestyleState& aRestyleState);
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protected:
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explicit nsBlockFrame(ComputedStyle* aStyle, nsPresContext* aPresContext,
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ClassID aID = kClassID)
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: nsContainerFrame(aStyle, aPresContext, aID) {
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#ifdef DEBUG
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InitDebugFlags();
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#endif
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}
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virtual ~nsBlockFrame();
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#ifdef DEBUG
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already_AddRefed<ComputedStyle> GetFirstLetterStyle(
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nsPresContext* aPresContext);
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#endif
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NS_DECLARE_FRAME_PROPERTY_WITHOUT_DTOR(LineCursorProperty, nsLineBox)
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bool HasLineCursor() { return GetStateBits() & NS_BLOCK_HAS_LINE_CURSOR; }
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nsLineBox* GetLineCursor() {
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return HasLineCursor() ? GetProperty(LineCursorProperty()) : nullptr;
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}
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nsLineBox* NewLineBox(nsIFrame* aFrame, bool aIsBlock) {
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return NS_NewLineBox(PresShell(), aFrame, aIsBlock);
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}
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nsLineBox* NewLineBox(nsLineBox* aFromLine, nsIFrame* aFrame,
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int32_t aCount) {
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return NS_NewLineBox(PresShell(), aFromLine, aFrame, aCount);
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}
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void FreeLineBox(nsLineBox* aLine) {
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if (aLine == GetLineCursor()) {
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ClearLineCursor();
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}
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aLine->Destroy(PresShell());
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}
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/**
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* Helper method for StealFrame.
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*/
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void RemoveFrameFromLine(nsIFrame* aChild, nsLineList::iterator aLine,
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nsFrameList& aFrameList, nsLineList& aLineList);
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void TryAllLines(nsLineList::iterator* aIterator,
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nsLineList::iterator* aStartIterator,
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nsLineList::iterator* aEndIterator, bool* aInOverflowLines,
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FrameLines** aOverflowLines);
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/** move the frames contained by aLine by aDeltaBCoord
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* if aLine is a block, its child floats are added to the state manager
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*/
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void SlideLine(BlockReflowInput& aState, nsLineBox* aLine,
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nscoord aDeltaBCoord);
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void UpdateLineContainerSize(nsLineBox* aLine,
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const nsSize& aNewContainerSize);
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// helper for SlideLine and UpdateLineContainerSize
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void MoveChildFramesOfLine(nsLineBox* aLine, nscoord aDeltaBCoord);
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void ComputeFinalSize(const ReflowInput& aReflowInput,
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BlockReflowInput& aState, ReflowOutput& aMetrics,
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nscoord* aBottomEdgeOfChildren);
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void ComputeOverflowAreas(const nsRect& aBounds,
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const nsStyleDisplay* aDisplay,
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nscoord aBottomEdgeOfChildren,
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nsOverflowAreas& aOverflowAreas);
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/**
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* Add the frames in aFrameList to this block after aPrevSibling.
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* This block thinks in terms of lines, but the frame construction code
|
|
* knows nothing about lines at all so we need to find the line that
|
|
* contains aPrevSibling and add aFrameList after aPrevSibling on that line.
|
|
* New lines are created as necessary to handle block data in aFrameList.
|
|
* This function will clear aFrameList.
|
|
*/
|
|
void AddFrames(nsFrameList& aFrameList, nsIFrame* aPrevSibling);
|
|
|
|
/**
|
|
* Perform Bidi resolution on this frame
|
|
*/
|
|
nsresult ResolveBidi();
|
|
|
|
/**
|
|
* Test whether the frame is a form control in a visual Bidi page.
|
|
* This is necessary for backwards-compatibility, because most visual
|
|
* pages use logical order for form controls so that they will
|
|
* display correctly on native widgets in OSs with Bidi support
|
|
* @param aPresContext the pres context
|
|
* @return whether the frame is a BIDI form control
|
|
*/
|
|
bool IsVisualFormControl(nsPresContext* aPresContext);
|
|
|
|
public:
|
|
/**
|
|
* Helper function for the frame ctor to register a ::marker frame.
|
|
*/
|
|
void SetMarkerFrameForListItem(nsIFrame* aMarkerFrame);
|
|
|
|
/**
|
|
* Does all the real work for removing aDeletedFrame
|
|
* -- finds the line containing aDeletedFrame
|
|
* -- removes all aDeletedFrame next-in-flows (or all continuations,
|
|
* if REMOVE_FIXED_CONTINUATIONS is given)
|
|
* -- marks lines dirty as needed
|
|
* -- marks textruns dirty (unless FRAMES_ARE_EMPTY is given, in which
|
|
* case textruns do not need to be dirtied)
|
|
* -- destroys all removed frames
|
|
*/
|
|
enum { REMOVE_FIXED_CONTINUATIONS = 0x02, FRAMES_ARE_EMPTY = 0x04 };
|
|
void DoRemoveFrame(nsIFrame* aDeletedFrame, uint32_t aFlags) {
|
|
AutoPostDestroyData data(PresContext());
|
|
DoRemoveFrameInternal(aDeletedFrame, aFlags, data.mData);
|
|
}
|
|
|
|
void ReparentFloats(nsIFrame* aFirstFrame, nsBlockFrame* aOldParent,
|
|
bool aReparentSiblings, ReparentingDirection aDirection);
|
|
|
|
virtual bool ComputeCustomOverflow(nsOverflowAreas& aOverflowAreas) override;
|
|
|
|
virtual void UnionChildOverflow(nsOverflowAreas& aOverflowAreas) override;
|
|
|
|
/**
|
|
* Load all of aFrame's floats into the float manager iff aFrame is not a
|
|
* block formatting context. Handles all necessary float manager translations;
|
|
* assumes float manager is in aFrame's parent's coord system.
|
|
*
|
|
* Safe to call on non-blocks (does nothing).
|
|
*/
|
|
static void RecoverFloatsFor(nsIFrame* aFrame, nsFloatManager& aFloatManager,
|
|
mozilla::WritingMode aWM,
|
|
const nsSize& aContainerSize);
|
|
|
|
/**
|
|
* Determine if we have any pushed floats from a previous continuation.
|
|
*
|
|
* @returns true, if any of the floats at the beginning of our mFloats list
|
|
* have the NS_FRAME_IS_PUSHED_FLOAT bit set; false otherwise.
|
|
*/
|
|
bool HasPushedFloatsFromPrevContinuation() const {
|
|
if (!mFloats.IsEmpty()) {
|
|
// If we have pushed floats, then they should be at the beginning of our
|
|
// float list.
|
|
if (mFloats.FirstChild()->GetStateBits() & NS_FRAME_IS_PUSHED_FLOAT) {
|
|
return true;
|
|
}
|
|
}
|
|
|
|
#ifdef DEBUG
|
|
// Double-check the above assertion that pushed floats should be at the
|
|
// beginning of our floats list.
|
|
for (nsFrameList::Enumerator e(mFloats); !e.AtEnd(); e.Next()) {
|
|
nsIFrame* f = e.get();
|
|
NS_ASSERTION(!(f->GetStateBits() & NS_FRAME_IS_PUSHED_FLOAT),
|
|
"pushed floats must be at the beginning of the float list");
|
|
}
|
|
#endif
|
|
|
|
// We may have a pending push of pushed floats too:
|
|
if (HasPushedFloats()) {
|
|
// XXX we can return 'true' here once we make HasPushedFloats
|
|
// not lie. (see nsBlockFrame::RemoveFloat)
|
|
auto* pushedFloats = GetPushedFloats();
|
|
return pushedFloats && !pushedFloats->IsEmpty();
|
|
}
|
|
return false;
|
|
}
|
|
|
|
// @see nsIFrame::AddSizeOfExcludingThisForTree
|
|
void AddSizeOfExcludingThisForTree(nsWindowSizes&) const override;
|
|
|
|
/**
|
|
* Clears any -webkit-line-clamp ellipsis on a line in this block or one
|
|
* of its descendants.
|
|
*/
|
|
void ClearLineClampEllipsis();
|
|
|
|
protected:
|
|
/** @see DoRemoveFrame */
|
|
void DoRemoveFrameInternal(nsIFrame* aDeletedFrame, uint32_t aFlags,
|
|
PostDestroyData& data);
|
|
|
|
/** grab overflow lines from this block's prevInFlow, and make them
|
|
* part of this block's mLines list.
|
|
* @return true if any lines were drained.
|
|
*/
|
|
bool DrainOverflowLines();
|
|
|
|
/**
|
|
* @return false iff this block does not have a float on any child list.
|
|
* This function is O(1).
|
|
*/
|
|
bool MaybeHasFloats() const {
|
|
if (!mFloats.IsEmpty()) {
|
|
return true;
|
|
}
|
|
// XXX this could be replaced with HasPushedFloats() if we enforced
|
|
// removing the property when the frame list becomes empty.
|
|
nsFrameList* list = GetPushedFloats();
|
|
if (list && !list->IsEmpty()) {
|
|
return true;
|
|
}
|
|
// For the OverflowOutOfFlowsProperty I think we do enforce that, but it's
|
|
// a mix of out-of-flow frames, so that's why the method name has "Maybe".
|
|
return GetStateBits() & NS_BLOCK_HAS_OVERFLOW_OUT_OF_FLOWS;
|
|
}
|
|
|
|
/**
|
|
* Moves frames from our PushedFloats list back into our mFloats list.
|
|
*/
|
|
void DrainSelfPushedFloats();
|
|
|
|
/**
|
|
* First calls DrainSelfPushedFloats() then grabs pushed floats from this
|
|
* block's prev-in-flow, and splice them into this block's mFloats list too.
|
|
*/
|
|
void DrainPushedFloats();
|
|
|
|
/** Load all our floats into the float manager (without reflowing them).
|
|
* Assumes float manager is in our own coordinate system.
|
|
*/
|
|
void RecoverFloats(nsFloatManager& aFloatManager, mozilla::WritingMode aWM,
|
|
const nsSize& aContainerSize);
|
|
|
|
/** Reflow pushed floats
|
|
*/
|
|
void ReflowPushedFloats(BlockReflowInput& aState,
|
|
nsOverflowAreas& aOverflowAreas,
|
|
nsReflowStatus& aStatus);
|
|
|
|
/** Find any trailing BR clear from the last line of the block (or its PIFs)
|
|
*/
|
|
mozilla::StyleClear FindTrailingClear();
|
|
|
|
/**
|
|
* Remove a float from our float list.
|
|
*/
|
|
void RemoveFloat(nsIFrame* aFloat);
|
|
/**
|
|
* Remove a float from the float cache for the line its placeholder is on.
|
|
*/
|
|
void RemoveFloatFromFloatCache(nsIFrame* aFloat);
|
|
|
|
void CollectFloats(nsIFrame* aFrame, nsFrameList& aList,
|
|
bool aCollectFromSiblings) {
|
|
if (MaybeHasFloats()) {
|
|
DoCollectFloats(aFrame, aList, aCollectFromSiblings);
|
|
}
|
|
}
|
|
void DoCollectFloats(nsIFrame* aFrame, nsFrameList& aList,
|
|
bool aCollectFromSiblings);
|
|
|
|
// Remove a float, abs, rel positioned frame from the appropriate block's list
|
|
static void DoRemoveOutOfFlowFrame(nsIFrame* aFrame);
|
|
|
|
/** set up the conditions necessary for an resize reflow
|
|
* the primary task is to mark the minimumly sufficient lines dirty.
|
|
*/
|
|
void PrepareResizeReflow(BlockReflowInput& aState);
|
|
|
|
/** reflow all lines that have been marked dirty */
|
|
void ReflowDirtyLines(BlockReflowInput& aState);
|
|
|
|
/** Mark a given line dirty due to reflow being interrupted on or before it */
|
|
void MarkLineDirtyForInterrupt(nsLineBox* aLine);
|
|
|
|
//----------------------------------------
|
|
// Methods for line reflow
|
|
/**
|
|
* Reflow a line.
|
|
*
|
|
* @param aState
|
|
* the current reflow input
|
|
* @param aLine
|
|
* the line to reflow. can contain a single block frame or contain 1 or
|
|
* more inline frames.
|
|
* @param aKeepReflowGoing [OUT]
|
|
* indicates whether the caller should continue to reflow more lines
|
|
*/
|
|
void ReflowLine(BlockReflowInput& aState, LineIterator aLine,
|
|
bool* aKeepReflowGoing);
|
|
|
|
// Return false if it needs another reflow because of reduced space
|
|
// between floats that are next to it (but not next to its top), and
|
|
// return true otherwise.
|
|
bool PlaceLine(BlockReflowInput& aState, nsLineLayout& aLineLayout,
|
|
LineIterator aLine,
|
|
nsFloatManager::SavedState* aFloatStateBeforeLine,
|
|
nsFlowAreaRect& aFlowArea, // in-out
|
|
nscoord& aAvailableSpaceBSize, // in-out
|
|
bool* aKeepReflowGoing);
|
|
|
|
/**
|
|
* If NS_BLOCK_LOOK_FOR_DIRTY_FRAMES is set, call MarkLineDirty
|
|
* on any line with a child frame that is dirty.
|
|
*/
|
|
void LazyMarkLinesDirty();
|
|
|
|
/**
|
|
* Mark |aLine| dirty, and, if necessary because of possible
|
|
* pull-up, mark the previous line dirty as well. Also invalidates textruns
|
|
* on those lines because the text in the lines might have changed due to
|
|
* addition/removal of frames.
|
|
* @param aLine the line to mark dirty
|
|
* @param aLineList the line list containing that line
|
|
*/
|
|
void MarkLineDirty(LineIterator aLine, const nsLineList* aLineList);
|
|
|
|
// XXX where to go
|
|
bool IsLastLine(BlockReflowInput& aState, LineIterator aLine);
|
|
|
|
void DeleteLine(BlockReflowInput& aState, nsLineList::iterator aLine,
|
|
nsLineList::iterator aLineEnd);
|
|
|
|
//----------------------------------------
|
|
// Methods for individual frame reflow
|
|
|
|
bool ShouldApplyBStartMargin(BlockReflowInput& aState, nsLineBox* aLine,
|
|
nsIFrame* aChildFrame);
|
|
|
|
void ReflowBlockFrame(BlockReflowInput& aState, LineIterator aLine,
|
|
bool* aKeepGoing);
|
|
|
|
void ReflowInlineFrames(BlockReflowInput& aState, LineIterator aLine,
|
|
bool* aKeepLineGoing);
|
|
|
|
void DoReflowInlineFrames(
|
|
BlockReflowInput& aState, nsLineLayout& aLineLayout, LineIterator aLine,
|
|
nsFlowAreaRect& aFloatAvailableSpace, nscoord& aAvailableSpaceBSize,
|
|
nsFloatManager::SavedState* aFloatStateBeforeLine, bool* aKeepReflowGoing,
|
|
LineReflowStatus* aLineReflowStatus, bool aAllowPullUp);
|
|
|
|
void ReflowInlineFrame(BlockReflowInput& aState, nsLineLayout& aLineLayout,
|
|
LineIterator aLine, nsIFrame* aFrame,
|
|
LineReflowStatus* aLineReflowStatus);
|
|
|
|
// Compute the available inline size for a float.
|
|
mozilla::LogicalRect AdjustFloatAvailableSpace(
|
|
BlockReflowInput& aState,
|
|
const mozilla::LogicalRect& aFloatAvailableSpace, nsIFrame* aFloatFrame);
|
|
// Computes the border-box inline size of the float
|
|
nscoord ComputeFloatISize(BlockReflowInput& aState,
|
|
const mozilla::LogicalRect& aFloatAvailableSpace,
|
|
nsIFrame* aFloat);
|
|
// An incomplete aReflowStatus indicates the float should be split
|
|
// but only if the available height is constrained.
|
|
// aAdjustedAvailableSpace is the result of calling
|
|
// nsBlockFrame::AdjustFloatAvailableSpace.
|
|
void ReflowFloat(BlockReflowInput& aState,
|
|
const mozilla::LogicalRect& aAdjustedAvailableSpace,
|
|
nsIFrame* aFloat, mozilla::LogicalMargin& aFloatMargin,
|
|
mozilla::LogicalMargin& aFloatOffsets,
|
|
// Whether the float's position
|
|
// (aAdjustedAvailableSpace) has been pushed down
|
|
// due to the presence of other floats.
|
|
bool aFloatPushedDown, nsReflowStatus& aReflowStatus);
|
|
|
|
//----------------------------------------
|
|
// Methods for pushing/pulling lines/frames
|
|
|
|
/**
|
|
* Create a next-in-flow, if necessary, for aFrame. If a new frame is
|
|
* created, place it in aLine if aLine is not null.
|
|
* @param aState the block reflow input
|
|
* @param aLine where to put a new frame
|
|
* @param aFrame the frame
|
|
* @return true if a new frame was created, false if not
|
|
*/
|
|
bool CreateContinuationFor(BlockReflowInput& aState, nsLineBox* aLine,
|
|
nsIFrame* aFrame);
|
|
|
|
/**
|
|
* Push aLine (and any after it), since it cannot be placed on this
|
|
* page/column. Set aKeepReflowGoing to false and set
|
|
* flag aState.mReflowStatus as incomplete.
|
|
*/
|
|
void PushTruncatedLine(BlockReflowInput& aState, LineIterator aLine,
|
|
bool* aKeepReflowGoing);
|
|
|
|
void SplitLine(BlockReflowInput& aState, nsLineLayout& aLineLayout,
|
|
LineIterator aLine, nsIFrame* aFrame,
|
|
LineReflowStatus* aLineReflowStatus);
|
|
|
|
/**
|
|
* Pull a frame from the next available location (one of our lines or
|
|
* one of our next-in-flows lines).
|
|
* @return the pulled frame or nullptr
|
|
*/
|
|
nsIFrame* PullFrame(BlockReflowInput& aState, LineIterator aLine);
|
|
|
|
/**
|
|
* Try to pull a frame out of a line pointed at by aFromLine.
|
|
*
|
|
* Note: pulling a frame from a line that is a place-holder frame
|
|
* doesn't automatically remove the corresponding float from the
|
|
* line's float array. This happens indirectly: either the line gets
|
|
* emptied (and destroyed) or the line gets reflowed (because we mark
|
|
* it dirty) and the code at the top of ReflowLine empties the
|
|
* array. So eventually, it will be removed, just not right away.
|
|
*
|
|
* @return the pulled frame or nullptr
|
|
*/
|
|
nsIFrame* PullFrameFrom(nsLineBox* aLine, nsBlockFrame* aFromContainer,
|
|
nsLineList::iterator aFromLine);
|
|
|
|
/**
|
|
* Push the line after aLineBefore to the overflow line list.
|
|
* @param aLineBefore a line in 'mLines' (or LinesBegin() when
|
|
* pushing the first line)
|
|
*/
|
|
void PushLines(BlockReflowInput& aState, nsLineList::iterator aLineBefore);
|
|
|
|
void PropagateFloatDamage(BlockReflowInput& aState, nsLineBox* aLine,
|
|
nscoord aDeltaBCoord);
|
|
|
|
void CheckFloats(BlockReflowInput& aState);
|
|
|
|
//----------------------------------------
|
|
// List handling kludge
|
|
|
|
void ReflowOutsideMarker(nsIFrame* aMarkerFrame, BlockReflowInput& aState,
|
|
ReflowOutput& aMetrics, nscoord aLineTop);
|
|
|
|
//----------------------------------------
|
|
|
|
virtual nsILineIterator* GetLineIterator() override;
|
|
|
|
public:
|
|
bool HasOverflowLines() const {
|
|
return 0 != (GetStateBits() & NS_BLOCK_HAS_OVERFLOW_LINES);
|
|
}
|
|
FrameLines* GetOverflowLines() const;
|
|
|
|
protected:
|
|
FrameLines* RemoveOverflowLines();
|
|
void SetOverflowLines(FrameLines* aOverflowLines);
|
|
void DestroyOverflowLines();
|
|
|
|
/**
|
|
* This class is useful for efficiently modifying the out of flow
|
|
* overflow list. It gives the client direct writable access to
|
|
* the frame list temporarily but ensures that property is only
|
|
* written back if absolutely necessary.
|
|
*/
|
|
struct nsAutoOOFFrameList {
|
|
nsFrameList mList;
|
|
|
|
explicit nsAutoOOFFrameList(nsBlockFrame* aBlock)
|
|
: mPropValue(aBlock->GetOverflowOutOfFlows()), mBlock(aBlock) {
|
|
if (mPropValue) {
|
|
mList = *mPropValue;
|
|
}
|
|
}
|
|
~nsAutoOOFFrameList() { mBlock->SetOverflowOutOfFlows(mList, mPropValue); }
|
|
|
|
protected:
|
|
nsFrameList* const mPropValue;
|
|
nsBlockFrame* const mBlock;
|
|
};
|
|
friend struct nsAutoOOFFrameList;
|
|
|
|
nsFrameList* GetOverflowOutOfFlows() const;
|
|
void SetOverflowOutOfFlows(const nsFrameList& aList, nsFrameList* aPropValue);
|
|
|
|
/**
|
|
* @return the inside ::marker frame or nullptr if we don't have one.
|
|
*/
|
|
nsIFrame* GetInsideMarker() const;
|
|
|
|
/**
|
|
* @return the outside ::marker frame or nullptr if we don't have one.
|
|
*/
|
|
nsIFrame* GetOutsideMarker() const;
|
|
|
|
/**
|
|
* @return the outside ::marker frame list frame property.
|
|
*/
|
|
nsFrameList* GetOutsideMarkerList() const;
|
|
|
|
/**
|
|
* @return true if this frame has pushed floats.
|
|
*/
|
|
bool HasPushedFloats() const {
|
|
return 0 != (GetStateBits() & NS_BLOCK_HAS_PUSHED_FLOATS);
|
|
}
|
|
|
|
// Get the pushed floats list, which is used for *temporary* storage
|
|
// of floats during reflow, between when we decide they don't fit in
|
|
// this block until our next continuation takes them.
|
|
nsFrameList* GetPushedFloats() const;
|
|
// Get the pushed floats list, or if there is not currently one,
|
|
// make a new empty one.
|
|
nsFrameList* EnsurePushedFloats();
|
|
// Remove and return the pushed floats list.
|
|
nsFrameList* RemovePushedFloats();
|
|
|
|
#ifdef DEBUG
|
|
void VerifyLines(bool aFinalCheckOK);
|
|
void VerifyOverflowSituation();
|
|
int32_t GetDepth() const;
|
|
#endif
|
|
|
|
nscoord mCachedMinISize = NS_INTRINSIC_ISIZE_UNKNOWN;
|
|
nscoord mCachedPrefISize = NS_INTRINSIC_ISIZE_UNKNOWN;
|
|
|
|
nsLineList mLines;
|
|
|
|
// List of all floats in this block
|
|
// XXXmats blocks rarely have floats, make it a frame property
|
|
nsFrameList mFloats;
|
|
|
|
friend class mozilla::BlockReflowInput;
|
|
friend class nsBlockInFlowLineIterator;
|
|
|
|
#ifdef DEBUG
|
|
public:
|
|
static bool gLamePaintMetrics;
|
|
static bool gLameReflowMetrics;
|
|
static bool gNoisy;
|
|
static bool gNoisyDamageRepair;
|
|
static bool gNoisyIntrinsic;
|
|
static bool gNoisyReflow;
|
|
static bool gReallyNoisyReflow;
|
|
static bool gNoisyFloatManager;
|
|
static bool gVerifyLines;
|
|
static bool gDisableResizeOpt;
|
|
|
|
static int32_t gNoiseIndent;
|
|
|
|
static const char* kReflowCommandType[];
|
|
|
|
protected:
|
|
static void InitDebugFlags();
|
|
#endif
|
|
};
|
|
|
|
#ifdef DEBUG
|
|
class AutoNoisyIndenter {
|
|
public:
|
|
explicit AutoNoisyIndenter(bool aDoIndent) : mIndented(aDoIndent) {
|
|
if (mIndented) {
|
|
nsBlockFrame::gNoiseIndent++;
|
|
}
|
|
}
|
|
~AutoNoisyIndenter() {
|
|
if (mIndented) {
|
|
nsBlockFrame::gNoiseIndent--;
|
|
}
|
|
}
|
|
|
|
private:
|
|
bool mIndented;
|
|
};
|
|
#endif
|
|
|
|
/**
|
|
* Iterates over all lines in the prev-in-flows/next-in-flows of this block.
|
|
*/
|
|
class nsBlockInFlowLineIterator {
|
|
public:
|
|
typedef nsBlockFrame::LineIterator LineIterator;
|
|
/**
|
|
* Set up the iterator to point to aLine which must be a normal line
|
|
* in aFrame (not an overflow line).
|
|
*/
|
|
nsBlockInFlowLineIterator(nsBlockFrame* aFrame, LineIterator aLine);
|
|
/**
|
|
* Set up the iterator to point to the first line found starting from
|
|
* aFrame. Sets aFoundValidLine to false if there is no such line.
|
|
* After aFoundValidLine has returned false, don't call any methods on this
|
|
* object again.
|
|
*/
|
|
nsBlockInFlowLineIterator(nsBlockFrame* aFrame, bool* aFoundValidLine);
|
|
/**
|
|
* Set up the iterator to point to the line that contains aFindFrame (either
|
|
* directly or indirectly). If aFrame is out of flow, or contained in an
|
|
* out-of-flow, finds the line containing the out-of-flow's placeholder. If
|
|
* the frame is not found, sets aFoundValidLine to false. After
|
|
* aFoundValidLine has returned false, don't call any methods on this
|
|
* object again.
|
|
*/
|
|
nsBlockInFlowLineIterator(nsBlockFrame* aFrame, nsIFrame* aFindFrame,
|
|
bool* aFoundValidLine);
|
|
|
|
LineIterator GetLine() { return mLine; }
|
|
bool IsLastLineInList();
|
|
nsBlockFrame* GetContainer() { return mFrame; }
|
|
bool GetInOverflow() { return mLineList != &mFrame->mLines; }
|
|
|
|
/**
|
|
* Returns the current line list we're iterating, null means
|
|
* we're iterating |mLines| of the container.
|
|
*/
|
|
nsLineList* GetLineList() { return mLineList; }
|
|
|
|
/**
|
|
* Returns the end-iterator of whatever line list we're in.
|
|
*/
|
|
LineIterator End();
|
|
|
|
/**
|
|
* Returns false if there are no more lines. After this has returned false,
|
|
* don't call any methods on this object again.
|
|
*/
|
|
bool Next();
|
|
/**
|
|
* Returns false if there are no more lines. After this has returned false,
|
|
* don't call any methods on this object again.
|
|
*/
|
|
bool Prev();
|
|
|
|
private:
|
|
friend class nsBlockFrame;
|
|
friend class nsBidiPresUtils;
|
|
// XXX nsBlockFrame uses this internally in one place. Try to remove it.
|
|
// XXX uhm, and nsBidiPresUtils::Resolve too.
|
|
nsBlockInFlowLineIterator(nsBlockFrame* aFrame, LineIterator aLine,
|
|
bool aInOverflow);
|
|
|
|
nsBlockFrame* mFrame;
|
|
LineIterator mLine;
|
|
nsLineList* mLineList; // the line list mLine is in
|
|
|
|
/**
|
|
* Moves iterator to next valid line reachable from the current block.
|
|
* Returns false if there are no valid lines.
|
|
*/
|
|
bool FindValidLine();
|
|
};
|
|
|
|
#endif /* nsBlockFrame_h___ */
|