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330 lines
10 KiB
C++
330 lines
10 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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/* struct containing the output from nsIFrame::Reflow */
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#ifndef nsHTMLReflowMetrics_h___
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#define nsHTMLReflowMetrics_h___
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#include "nsRect.h"
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#include "nsBoundingMetrics.h"
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#include "WritingModes.h"
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//----------------------------------------------------------------------
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// Option flags
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#define NS_REFLOW_CALC_BOUNDING_METRICS 0x0001
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/**
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* When we store overflow areas as an array of scrollable and visual
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* overflow, we use these indices.
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*
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* eOverflowType_LENGTH is needed (for gcc 4.5.*, at least) to ensure
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* that 2 is a valid value of nsOverflowType for use in
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* NS_FOR_FRAME_OVERFLOW_TYPES.
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*/
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enum nsOverflowType { eVisualOverflow, eScrollableOverflow,
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eOverflowType_LENGTH };
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#define NS_FOR_FRAME_OVERFLOW_TYPES(var_) \
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for (nsOverflowType var_ = nsOverflowType(0); var_ < 2; \
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var_ = nsOverflowType(var_ + 1))
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struct nsOverflowAreas {
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private:
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nsRect mRects[2];
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public:
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nsRect& Overflow(size_t aIndex) {
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NS_ASSERTION(aIndex < 2, "index out of range");
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return mRects[aIndex];
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}
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const nsRect& Overflow(size_t aIndex) const {
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NS_ASSERTION(aIndex < 2, "index out of range");
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return mRects[aIndex];
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}
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nsRect& VisualOverflow() { return mRects[eVisualOverflow]; }
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const nsRect& VisualOverflow() const { return mRects[eVisualOverflow]; }
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nsRect& ScrollableOverflow() { return mRects[eScrollableOverflow]; }
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const nsRect& ScrollableOverflow() const { return mRects[eScrollableOverflow]; }
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nsOverflowAreas() {
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// default-initializes to zero due to nsRect's default constructor
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}
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nsOverflowAreas(const nsRect& aVisualOverflow,
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const nsRect& aScrollableOverflow)
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{
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mRects[eVisualOverflow] = aVisualOverflow;
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mRects[eScrollableOverflow] = aScrollableOverflow;
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}
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nsOverflowAreas(const nsOverflowAreas& aOther) {
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*this = aOther;
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}
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nsOverflowAreas& operator=(const nsOverflowAreas& aOther) {
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mRects[0] = aOther.mRects[0];
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mRects[1] = aOther.mRects[1];
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return *this;
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}
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bool operator==(const nsOverflowAreas& aOther) const {
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// Scrollable overflow is a point-set rectangle and visual overflow
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// is a pixel-set rectangle.
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return VisualOverflow().IsEqualInterior(aOther.VisualOverflow()) &&
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ScrollableOverflow().IsEqualEdges(aOther.ScrollableOverflow());
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}
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bool operator!=(const nsOverflowAreas& aOther) const {
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return !(*this == aOther);
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}
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nsOverflowAreas operator+(const nsPoint& aPoint) const {
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nsOverflowAreas result(*this);
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result += aPoint;
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return result;
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}
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nsOverflowAreas& operator+=(const nsPoint& aPoint) {
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mRects[0] += aPoint;
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mRects[1] += aPoint;
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return *this;
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}
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void Clear() {
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mRects[0].SetRect(0, 0, 0, 0);
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mRects[1].SetRect(0, 0, 0, 0);
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}
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// Mutates |this| by unioning both overflow areas with |aOther|.
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void UnionWith(const nsOverflowAreas& aOther);
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// Mutates |this| by unioning both overflow areas with |aRect|.
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void UnionAllWith(const nsRect& aRect);
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// Mutates |this| by setting both overflow areas to |aRect|.
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void SetAllTo(const nsRect& aRect);
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};
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/**
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* An nsCollapsingMargin represents a vertical collapsing margin between
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* blocks as described in section 8.3.1 of CSS2,
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* <URL: http://www.w3.org/TR/REC-CSS2/box.html#collapsing-margins >.
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*
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* All adjacent vertical margins collapse, and the resulting margin is
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* the sum of the largest positive margin included and the smallest (most
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* negative) negative margin included.
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*/
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struct nsCollapsingMargin {
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private:
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nscoord mMostPos; // the largest positive margin included
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nscoord mMostNeg; // the smallest negative margin included
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public:
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nsCollapsingMargin()
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: mMostPos(0),
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mMostNeg(0)
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{
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}
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nsCollapsingMargin(const nsCollapsingMargin& aOther)
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: mMostPos(aOther.mMostPos),
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mMostNeg(aOther.mMostNeg)
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{
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}
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bool operator==(const nsCollapsingMargin& aOther)
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{
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return mMostPos == aOther.mMostPos &&
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mMostNeg == aOther.mMostNeg;
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}
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bool operator!=(const nsCollapsingMargin& aOther)
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{
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return !(*this == aOther);
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}
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nsCollapsingMargin& operator=(const nsCollapsingMargin& aOther)
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{
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mMostPos = aOther.mMostPos;
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mMostNeg = aOther.mMostNeg;
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return *this;
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}
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void Include(nscoord aCoord)
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{
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if (aCoord > mMostPos)
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mMostPos = aCoord;
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else if (aCoord < mMostNeg)
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mMostNeg = aCoord;
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}
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void Include(const nsCollapsingMargin& aOther)
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{
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if (aOther.mMostPos > mMostPos)
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mMostPos = aOther.mMostPos;
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if (aOther.mMostNeg < mMostNeg)
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mMostNeg = aOther.mMostNeg;
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}
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void Zero()
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{
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mMostPos = 0;
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mMostNeg = 0;
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}
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bool IsZero() const
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{
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return (mMostPos == 0) && (mMostNeg == 0);
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}
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nscoord get() const
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{
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return mMostPos + mMostNeg;
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}
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};
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/**
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* Reflow metrics used to return the frame's desired size and alignment
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* information.
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*
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* @see #Reflow()
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*/
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class nsHTMLReflowMetrics {
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public:
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// XXXldb Should |aFlags| generally be passed from parent to child?
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// Some places do it, and some don't. |aFlags| should perhaps go away
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// entirely.
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// XXX width/height/ascent are OUT parameters and so they shouldn't
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// have to be initialized, but there are some bad frame classes that
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// aren't properly setting them when returning from Reflow()...
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nsHTMLReflowMetrics(mozilla::WritingMode aWritingMode, uint32_t aFlags = 0)
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: mISize(0)
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, mBSize(0)
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, mBlockStartAscent(ASK_FOR_BASELINE)
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, mFlags(aFlags)
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, mWritingMode(aWritingMode)
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{}
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// ISize and BSize are logical-coordinate dimensions:
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// ISize is the size in the writing mode's inline direction (which equates to
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// width in horizontal writing modes, height in vertical ones), and BSize is
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// the size in the block-progression direction.
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nscoord ISize() const { return mISize; }
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nscoord BSize() const { return mBSize; }
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nscoord& ISize() { return mISize; }
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nscoord& BSize() { return mBSize; }
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// Width and Height are physical dimensions, independent of writing mode.
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// Accessing these is slightly more expensive than accessing the logical
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// dimensions (once vertical writing mode support is enabled); as far as
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// possible, client code should work purely with logical dimensions.
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nscoord Width() const { return mWritingMode.IsVertical() ? mBSize : mISize; }
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nscoord Height() const { return mWritingMode.IsVertical() ? mISize : mBSize; }
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// It's only meaningful to consider "ascent" on the block-start side of the
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// frame; asking for the "ascent" on any other side will just return zero.
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nscoord TopAscent() const
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{
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return mWritingMode.IsVertical() ? 0 : mBlockStartAscent;
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}
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nscoord LeftAscent() const
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{
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return mWritingMode.IsVertical() && mWritingMode.IsVerticalLR() ?
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mBlockStartAscent : 0;
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}
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nscoord RightAscent() const
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{
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return mWritingMode.IsVertical() && !mWritingMode.IsVerticalLR() ?
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mBlockStartAscent : 0;
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}
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nscoord& Width() { return mWritingMode.IsVertical() ? mBSize : mISize; }
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nscoord& Height() { return mWritingMode.IsVertical() ? mISize : mBSize; }
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// To set the ascent value, we must be sure we're working with the correct
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// writing mode, so either pass it to the logical setter...
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void SetBlockStartAscent(mozilla::WritingMode aWritingMode, nscoord aAscent)
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{
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NS_ASSERTION(aWritingMode == mWritingMode, "writing mode mismatch");
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mBlockStartAscent = aAscent;
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}
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// ...or call the appropriate physical setter (these will probably be removed
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// eventually).
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void SetTopAscent(nscoord aAscent)
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{
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NS_ASSERTION(!mWritingMode.IsVertical(), "writing mode mismatch");
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mBlockStartAscent = aAscent;
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}
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void SetLeftAscent(nscoord aAscent)
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{
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NS_ASSERTION(mWritingMode.IsVertical() && mWritingMode.IsVerticalLR(),
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"writing mode mismatch");
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mBlockStartAscent = aAscent;
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}
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void SetRightAscent(nscoord aAscent)
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{
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NS_ASSERTION(mWritingMode.IsVertical() && !mWritingMode.IsVerticalLR(),
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"writing mode mismatch");
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mBlockStartAscent = aAscent;
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}
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enum { ASK_FOR_BASELINE = nscoord_MAX };
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// Metrics that _exactly_ enclose the text to allow precise MathML placements.
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// If the NS_REFLOW_CALC_BOUNDING_METRICS flag is set, then the caller is
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// requesting that you also compute additional details about your inner
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// bounding box and italic correction. For example, the bounding box of
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// msup is the smallest rectangle that _exactly_ encloses both the text
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// of the base and the text of the superscript.
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nsBoundingMetrics mBoundingMetrics; // [OUT]
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// Carried out bottom margin values. This is the collapsed
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// (generational) bottom margin value.
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nsCollapsingMargin mCarriedOutBottomMargin;
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// For frames that have content that overflow their content area
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// (HasOverflowAreas() is true) these rectangles represent the total
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// area of the frame including visible overflow, i.e., don't include
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// overflowing content that is hidden. The rects are in the local
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// coordinate space of the frame, and should be at least as big as the
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// desired size. If there is no content that overflows, then the
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// overflow area is identical to the desired size and should be {0, 0,
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// width, height}.
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nsOverflowAreas mOverflowAreas;
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nsRect& VisualOverflow()
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{ return mOverflowAreas.VisualOverflow(); }
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const nsRect& VisualOverflow() const
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{ return mOverflowAreas.VisualOverflow(); }
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nsRect& ScrollableOverflow()
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{ return mOverflowAreas.ScrollableOverflow(); }
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const nsRect& ScrollableOverflow() const
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{ return mOverflowAreas.ScrollableOverflow(); }
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// Set all of mOverflowAreas to (0, 0, width, height).
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void SetOverflowAreasToDesiredBounds();
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// Union all of mOverflowAreas with (0, 0, width, height).
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void UnionOverflowAreasWithDesiredBounds();
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mozilla::WritingMode GetWritingMode() const { return mWritingMode; }
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private:
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nscoord mISize, mBSize; // [OUT] desired width and height (border-box)
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nscoord mBlockStartAscent; // [OUT] baseline (in Block direction), or ASK_FOR_BASELINE
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public:
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uint32_t mFlags;
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private:
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mozilla::WritingMode mWritingMode;
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};
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#endif /* nsHTMLReflowMetrics_h___ */
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