mirror of
https://github.com/mozilla/gecko-dev.git
synced 2024-11-01 14:45:29 +00:00
716 lines
31 KiB
C++
716 lines
31 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
|
|
/* This Source Code Form is subject to the terms of the Mozilla Public
|
|
* License, v. 2.0. If a copy of the MPL was not distributed with this
|
|
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
|
|
|
|
/* struct containing the input to nsIFrame::Reflow */
|
|
|
|
#ifndef nsHTMLReflowState_h___
|
|
#define nsHTMLReflowState_h___
|
|
|
|
#include "nsMargin.h"
|
|
#include "nsStyleCoord.h"
|
|
#include "nsIFrame.h"
|
|
#include "mozilla/Assertions.h"
|
|
#include <algorithm>
|
|
|
|
class nsPresContext;
|
|
class nsRenderingContext;
|
|
class nsFloatManager;
|
|
class nsLineLayout;
|
|
class nsIPercentHeightObserver;
|
|
struct nsHypotheticalBox;
|
|
|
|
/**
|
|
* @return aValue clamped to [aMinValue, aMaxValue].
|
|
*
|
|
* @note This function needs to handle aMinValue > aMaxValue. In that case,
|
|
* aMinValue is returned.
|
|
* @see http://www.w3.org/TR/CSS21/visudet.html#min-max-widths
|
|
* @see http://www.w3.org/TR/CSS21/visudet.html#min-max-heights
|
|
*/
|
|
template <class NumericType>
|
|
NumericType
|
|
NS_CSS_MINMAX(NumericType aValue, NumericType aMinValue, NumericType aMaxValue)
|
|
{
|
|
NumericType result = aValue;
|
|
if (aMaxValue < result)
|
|
result = aMaxValue;
|
|
if (aMinValue > result)
|
|
result = aMinValue;
|
|
return result;
|
|
}
|
|
|
|
/**
|
|
* CSS Frame type. Included as part of the reflow state.
|
|
*/
|
|
typedef uint32_t nsCSSFrameType;
|
|
|
|
#define NS_CSS_FRAME_TYPE_UNKNOWN 0
|
|
#define NS_CSS_FRAME_TYPE_INLINE 1
|
|
#define NS_CSS_FRAME_TYPE_BLOCK 2 /* block-level in normal flow */
|
|
#define NS_CSS_FRAME_TYPE_FLOATING 3
|
|
#define NS_CSS_FRAME_TYPE_ABSOLUTE 4
|
|
#define NS_CSS_FRAME_TYPE_INTERNAL_TABLE 5 /* row group frame, row frame, cell frame, ... */
|
|
|
|
/**
|
|
* Bit-flag that indicates whether the element is replaced. Applies to inline,
|
|
* block-level, floating, and absolutely positioned elements
|
|
*/
|
|
#define NS_CSS_FRAME_TYPE_REPLACED 0x08000
|
|
|
|
/**
|
|
* Bit-flag that indicates that the element is replaced and contains a block
|
|
* (eg some form controls). Applies to inline, block-level, floating, and
|
|
* absolutely positioned elements. Mutually exclusive with
|
|
* NS_CSS_FRAME_TYPE_REPLACED.
|
|
*/
|
|
#define NS_CSS_FRAME_TYPE_REPLACED_CONTAINS_BLOCK 0x10000
|
|
|
|
/**
|
|
* Helper macros for telling whether items are replaced
|
|
*/
|
|
#define NS_FRAME_IS_REPLACED_NOBLOCK(_ft) \
|
|
(NS_CSS_FRAME_TYPE_REPLACED == ((_ft) & NS_CSS_FRAME_TYPE_REPLACED))
|
|
|
|
#define NS_FRAME_IS_REPLACED(_ft) \
|
|
(NS_FRAME_IS_REPLACED_NOBLOCK(_ft) || \
|
|
NS_FRAME_IS_REPLACED_CONTAINS_BLOCK(_ft))
|
|
|
|
#define NS_FRAME_REPLACED(_ft) \
|
|
(NS_CSS_FRAME_TYPE_REPLACED | (_ft))
|
|
|
|
#define NS_FRAME_IS_REPLACED_CONTAINS_BLOCK(_ft) \
|
|
(NS_CSS_FRAME_TYPE_REPLACED_CONTAINS_BLOCK == \
|
|
((_ft) & NS_CSS_FRAME_TYPE_REPLACED_CONTAINS_BLOCK))
|
|
|
|
#define NS_FRAME_REPLACED_CONTAINS_BLOCK(_ft) \
|
|
(NS_CSS_FRAME_TYPE_REPLACED_CONTAINS_BLOCK | (_ft))
|
|
|
|
/**
|
|
* A macro to extract the type. Masks off the 'replaced' bit-flag
|
|
*/
|
|
#define NS_FRAME_GET_TYPE(_ft) \
|
|
((_ft) & ~(NS_CSS_FRAME_TYPE_REPLACED | \
|
|
NS_CSS_FRAME_TYPE_REPLACED_CONTAINS_BLOCK))
|
|
|
|
// A base class of nsHTMLReflowState that computes only the padding,
|
|
// border, and margin, since those values are needed more often.
|
|
struct nsCSSOffsetState {
|
|
public:
|
|
typedef mozilla::WritingMode WritingMode;
|
|
typedef mozilla::LogicalMargin LogicalMargin;
|
|
|
|
// the frame being reflowed
|
|
nsIFrame* frame;
|
|
|
|
// rendering context to use for measurement
|
|
nsRenderingContext* rendContext;
|
|
|
|
const nsMargin& ComputedPhysicalMargin() const { return mComputedMargin; }
|
|
const nsMargin& ComputedPhysicalBorderPadding() const { return mComputedBorderPadding; }
|
|
const nsMargin& ComputedPhysicalPadding() const { return mComputedPadding; }
|
|
|
|
// We may need to eliminate the (few) users of these writable-reference accessors
|
|
// as part of migrating to logical coordinates.
|
|
nsMargin& ComputedPhysicalMargin() { return mComputedMargin; }
|
|
nsMargin& ComputedPhysicalBorderPadding() { return mComputedBorderPadding; }
|
|
nsMargin& ComputedPhysicalPadding() { return mComputedPadding; }
|
|
|
|
LogicalMargin ComputedLogicalMargin() const
|
|
{ return LogicalMargin(mWritingMode, mComputedMargin); }
|
|
LogicalMargin ComputedLogicalBorderPadding() const
|
|
{ return LogicalMargin(mWritingMode, mComputedBorderPadding); }
|
|
LogicalMargin ComputedLogicalPadding() const
|
|
{ return LogicalMargin(mWritingMode, mComputedPadding); }
|
|
|
|
WritingMode GetWritingMode() const { return mWritingMode; }
|
|
|
|
protected:
|
|
// cached copy of the frame's writing-mode, for logical coordinates
|
|
WritingMode mWritingMode;
|
|
|
|
// These are PHYSICAL coordinates (for now).
|
|
// Will probably become logical in due course.
|
|
|
|
// Computed margin values
|
|
nsMargin mComputedMargin;
|
|
|
|
// Cached copy of the border + padding values
|
|
nsMargin mComputedBorderPadding;
|
|
|
|
// Computed padding values
|
|
nsMargin mComputedPadding;
|
|
|
|
public:
|
|
// Callers using this constructor must call InitOffsets on their own.
|
|
nsCSSOffsetState(nsIFrame *aFrame, nsRenderingContext *aRenderingContext)
|
|
: frame(aFrame)
|
|
, rendContext(aRenderingContext)
|
|
, mWritingMode(aFrame->GetWritingMode())
|
|
{
|
|
}
|
|
|
|
nsCSSOffsetState(nsIFrame *aFrame, nsRenderingContext *aRenderingContext,
|
|
nscoord aContainingBlockWidth);
|
|
|
|
#ifdef DEBUG
|
|
// Reflow trace methods. Defined in nsFrame.cpp so they have access
|
|
// to the display-reflow infrastructure.
|
|
static void* DisplayInitOffsetsEnter(nsIFrame* aFrame,
|
|
nsCSSOffsetState* aState,
|
|
nscoord aHorizontalPercentBasis,
|
|
nscoord aVerticalPercentBasis,
|
|
const nsMargin* aBorder,
|
|
const nsMargin* aPadding);
|
|
static void DisplayInitOffsetsExit(nsIFrame* aFrame,
|
|
nsCSSOffsetState* aState,
|
|
void* aValue);
|
|
#endif
|
|
|
|
private:
|
|
/**
|
|
* Computes margin values from the specified margin style information, and
|
|
* fills in the mComputedMargin member.
|
|
*
|
|
* @param aHorizontalPercentBasis
|
|
* Length to use for resolving percentage margin values in the horizontal
|
|
* axis. Usually the containing block width.
|
|
* @param aVerticalPercentBasis
|
|
* Length to use for resolving percentage margin values in the vertical
|
|
* axis. Usually the containing block width, per CSS21 sec 8.3, but may
|
|
* be the containing block *height*, e.g. in CSS3 Flexbox and Grid.
|
|
* @return true if the margin is dependent on the containing block size.
|
|
*/
|
|
bool ComputeMargin(nscoord aHorizontalPercentBasis,
|
|
nscoord aVerticalPercentBasis);
|
|
|
|
/**
|
|
* Computes padding values from the specified padding style information, and
|
|
* fills in the mComputedPadding member.
|
|
*
|
|
* @param aHorizontalPercentBasis
|
|
* Length to use for resolving percentage padding values in the horizontal
|
|
* axis. Usually the containing block width.
|
|
* @param aVerticalPercentBasis
|
|
* Length to use for resolving percentage padding values in the vertical
|
|
* axis. Usually the containing block width, per CSS21 sec 8.4, but may
|
|
* be the containing block *height* in e.g. CSS3 Flexbox and Grid.
|
|
* @return true if the padding is dependent on the containing block size.
|
|
*/
|
|
bool ComputePadding(nscoord aHorizontalPercentBasis,
|
|
nscoord aVerticalPercentBasis, nsIAtom* aFrameType);
|
|
|
|
protected:
|
|
|
|
void InitOffsets(nscoord aHorizontalPercentBasis,
|
|
nscoord aVerticalPercentBasis,
|
|
nsIAtom* aFrameType,
|
|
const nsMargin *aBorder = nullptr,
|
|
const nsMargin *aPadding = nullptr);
|
|
|
|
/*
|
|
* Convert nsStyleCoord to nscoord when percentages depend on the
|
|
* containing block width, and enumerated values are for width,
|
|
* min-width, or max-width. Does not handle auto widths.
|
|
*/
|
|
inline nscoord ComputeWidthValue(nscoord aContainingBlockWidth,
|
|
nscoord aContentEdgeToBoxSizing,
|
|
nscoord aBoxSizingToMarginEdge,
|
|
const nsStyleCoord& aCoord);
|
|
// same as previous, but using mComputedBorderPadding, mComputedPadding,
|
|
// and mComputedMargin
|
|
nscoord ComputeWidthValue(nscoord aContainingBlockWidth,
|
|
uint8_t aBoxSizing,
|
|
const nsStyleCoord& aCoord);
|
|
|
|
nscoord ComputeHeightValue(nscoord aContainingBlockHeight,
|
|
uint8_t aBoxSizing,
|
|
const nsStyleCoord& aCoord);
|
|
};
|
|
|
|
/**
|
|
* State passed to a frame during reflow or intrinsic size calculation.
|
|
*
|
|
* XXX Refactor so only a base class (nsSizingState?) is used for intrinsic
|
|
* size calculation.
|
|
*
|
|
* @see nsIFrame#Reflow()
|
|
*/
|
|
struct nsHTMLReflowState : public nsCSSOffsetState {
|
|
// the reflow states are linked together. this is the pointer to the
|
|
// parent's reflow state
|
|
const nsHTMLReflowState* parentReflowState;
|
|
|
|
// pointer to the float manager associated with this area
|
|
nsFloatManager* mFloatManager;
|
|
|
|
// LineLayout object (only for inline reflow; set to nullptr otherwise)
|
|
nsLineLayout* mLineLayout;
|
|
|
|
// The appropriate reflow state for the containing block (for
|
|
// percentage widths, etc.) of this reflow state's frame.
|
|
const nsHTMLReflowState *mCBReflowState;
|
|
|
|
// The type of frame, from css's perspective. This value is
|
|
// initialized by the Init method below.
|
|
nsCSSFrameType mFrameType;
|
|
|
|
// The amount the in-flow position of the block is moving vertically relative
|
|
// to its previous in-flow position (i.e. the amount the line containing the
|
|
// block is moving).
|
|
// This should be zero for anything which is not a block outside, and it
|
|
// should be zero for anything which has a non-block parent.
|
|
// The intended use of this value is to allow the accurate determination
|
|
// of the potential impact of a float
|
|
// This takes on an arbitrary value the first time a block is reflowed
|
|
nscoord mBlockDelta;
|
|
|
|
// Accessors for the private fields below. Forcing all callers to use these
|
|
// will allow us to introduce logical-coordinate versions and gradually
|
|
// change clients from physical to logical as needed; and potentially switch
|
|
// the internal fields from physical to logical coordinates in due course,
|
|
// while maintaining compatibility with not-yet-updated code.
|
|
nscoord AvailableWidth() const { return mAvailableWidth; }
|
|
nscoord AvailableHeight() const { return mAvailableHeight; }
|
|
nscoord ComputedWidth() const { return mComputedWidth; }
|
|
nscoord ComputedHeight() const { return mComputedHeight; }
|
|
nscoord ComputedMinWidth() const { return mComputedMinWidth; }
|
|
nscoord ComputedMaxWidth() const { return mComputedMaxWidth; }
|
|
nscoord ComputedMinHeight() const { return mComputedMinHeight; }
|
|
nscoord ComputedMaxHeight() const { return mComputedMaxHeight; }
|
|
|
|
nscoord& AvailableWidth() { return mAvailableWidth; }
|
|
nscoord& AvailableHeight() { return mAvailableHeight; }
|
|
nscoord& ComputedWidth() { return mComputedWidth; }
|
|
nscoord& ComputedHeight() { return mComputedHeight; }
|
|
nscoord& ComputedMinWidth() { return mComputedMinWidth; }
|
|
nscoord& ComputedMaxWidth() { return mComputedMaxWidth; }
|
|
nscoord& ComputedMinHeight() { return mComputedMinHeight; }
|
|
nscoord& ComputedMaxHeight() { return mComputedMaxHeight; }
|
|
|
|
// ISize and BSize are logical-coordinate dimensions:
|
|
// ISize is the size in the writing mode's inline direction (which equates to
|
|
// width in horizontal writing modes, height in vertical ones), and BSize is
|
|
// the size in the block-progression direction.
|
|
nscoord AvailableISize() const
|
|
{ return mWritingMode.IsVertical() ? mAvailableHeight : mAvailableWidth; }
|
|
nscoord AvailableBSize() const
|
|
{ return mWritingMode.IsVertical() ? mAvailableWidth : mAvailableHeight; }
|
|
nscoord ComputedISize() const
|
|
{ return mWritingMode.IsVertical() ? mComputedHeight : mComputedWidth; }
|
|
nscoord ComputedBSize() const
|
|
{ return mWritingMode.IsVertical() ? mComputedWidth : mComputedHeight; }
|
|
nscoord ComputedMinISize() const
|
|
{ return mWritingMode.IsVertical() ? mComputedMinHeight : mComputedMinWidth; }
|
|
nscoord ComputedMaxISize() const
|
|
{ return mWritingMode.IsVertical() ? mComputedMaxHeight : mComputedMaxWidth; }
|
|
nscoord ComputedMinBSize() const
|
|
{ return mWritingMode.IsVertical() ? mComputedMinWidth : mComputedMinHeight; }
|
|
nscoord ComputedMaxBSize() const
|
|
{ return mWritingMode.IsVertical() ? mComputedMaxWidth : mComputedMaxHeight; }
|
|
|
|
nscoord& AvailableISize()
|
|
{ return mWritingMode.IsVertical() ? mAvailableHeight : mAvailableWidth; }
|
|
nscoord& AvailableBSize()
|
|
{ return mWritingMode.IsVertical() ? mAvailableWidth : mAvailableHeight; }
|
|
nscoord& ComputedISize()
|
|
{ return mWritingMode.IsVertical() ? mComputedHeight : mComputedWidth; }
|
|
nscoord& ComputedBSize()
|
|
{ return mWritingMode.IsVertical() ? mComputedWidth : mComputedHeight; }
|
|
nscoord& ComputedMinISize()
|
|
{ return mWritingMode.IsVertical() ? mComputedMinHeight : mComputedMinWidth; }
|
|
nscoord& ComputedMaxISize()
|
|
{ return mWritingMode.IsVertical() ? mComputedMaxHeight : mComputedMaxWidth; }
|
|
nscoord& ComputedMinBSize()
|
|
{ return mWritingMode.IsVertical() ? mComputedMinWidth : mComputedMinHeight; }
|
|
nscoord& ComputedMaxBSize()
|
|
{ return mWritingMode.IsVertical() ? mComputedMaxWidth : mComputedMaxHeight; }
|
|
|
|
// XXX this will need to change when we make mComputedOffsets logical;
|
|
// we won't be able to return a reference for the physical offsets
|
|
const nsMargin& ComputedPhysicalOffsets() const { return mComputedOffsets; }
|
|
nsMargin& ComputedPhysicalOffsets() { return mComputedOffsets; }
|
|
|
|
LogicalMargin ComputedLogicalOffsets() const
|
|
{ return LogicalMargin(mWritingMode, mComputedOffsets); }
|
|
|
|
private:
|
|
// the available width in which to reflow the frame. The space
|
|
// represents the amount of room for the frame's margin, border,
|
|
// padding, and content area. The frame size you choose should fit
|
|
// within the available width.
|
|
nscoord mAvailableWidth;
|
|
|
|
// A value of NS_UNCONSTRAINEDSIZE for the available height means
|
|
// you can choose whatever size you want. In galley mode the
|
|
// available height is always NS_UNCONSTRAINEDSIZE, and only page
|
|
// mode or multi-column layout involves a constrained height. The
|
|
// element's the top border and padding, and content, must fit. If the
|
|
// element is complete after reflow then its bottom border, padding
|
|
// and margin (and similar for its complete ancestors) will need to
|
|
// fit in this height.
|
|
nscoord mAvailableHeight;
|
|
|
|
// The computed width specifies the frame's content area width, and it does
|
|
// not apply to inline non-replaced elements
|
|
//
|
|
// For replaced inline frames, a value of NS_INTRINSICSIZE means you should
|
|
// use your intrinsic width as the computed width
|
|
//
|
|
// For block-level frames, the computed width is based on the width of the
|
|
// containing block, the margin/border/padding areas, and the min/max width.
|
|
nscoord mComputedWidth;
|
|
|
|
// The computed height specifies the frame's content height, and it does
|
|
// not apply to inline non-replaced elements
|
|
//
|
|
// For replaced inline frames, a value of NS_INTRINSICSIZE means you should
|
|
// use your intrinsic height as the computed height
|
|
//
|
|
// For non-replaced block-level frames in the flow and floated, a value of
|
|
// NS_AUTOHEIGHT means you choose a height to shrink wrap around the normal
|
|
// flow child frames. The height must be within the limit of the min/max
|
|
// height if there is such a limit
|
|
//
|
|
// For replaced block-level frames, a value of NS_INTRINSICSIZE
|
|
// means you use your intrinsic height as the computed height
|
|
nscoord mComputedHeight;
|
|
|
|
// Computed values for 'left/top/right/bottom' offsets. Only applies to
|
|
// 'positioned' elements. These are PHYSICAL coordinates (for now).
|
|
nsMargin mComputedOffsets;
|
|
|
|
// Computed values for 'min-width/max-width' and 'min-height/max-height'
|
|
// XXXldb The width ones here should go; they should be needed only
|
|
// internally.
|
|
nscoord mComputedMinWidth, mComputedMaxWidth;
|
|
nscoord mComputedMinHeight, mComputedMaxHeight;
|
|
|
|
public:
|
|
// Cached pointers to the various style structs used during intialization
|
|
const nsStyleDisplay* mStyleDisplay;
|
|
const nsStyleVisibility* mStyleVisibility;
|
|
const nsStylePosition* mStylePosition;
|
|
const nsStyleBorder* mStyleBorder;
|
|
const nsStyleMargin* mStyleMargin;
|
|
const nsStylePadding* mStylePadding;
|
|
const nsStyleText* mStyleText;
|
|
|
|
bool IsFloating() const;
|
|
|
|
uint8_t GetDisplay() const;
|
|
|
|
// a frame (e.g. nsTableCellFrame) which may need to generate a special
|
|
// reflow for percent height calculations
|
|
nsIPercentHeightObserver* mPercentHeightObserver;
|
|
|
|
// CSS margin collapsing sometimes requires us to reflow
|
|
// optimistically assuming that margins collapse to see if clearance
|
|
// is required. When we discover that clearance is required, we
|
|
// store the frame in which clearance was discovered to the location
|
|
// requested here.
|
|
nsIFrame** mDiscoveredClearance;
|
|
|
|
// This value keeps track of how deeply nested a given reflow state
|
|
// is from the top of the frame tree.
|
|
int16_t mReflowDepth;
|
|
|
|
struct ReflowStateFlags {
|
|
uint16_t mSpecialHeightReflow:1; // used by tables to communicate special reflow (in process) to handle
|
|
// percent height frames inside cells which may not have computed heights
|
|
uint16_t mNextInFlowUntouched:1; // nothing in the frame's next-in-flow (or its descendants)
|
|
// is changing
|
|
uint16_t mIsTopOfPage:1; // Is the current context at the top of a
|
|
// page? When true, we force something
|
|
// that's too tall for a page/column to
|
|
// fit anyway to avoid infinite loops.
|
|
uint16_t mHasClearance:1; // Block has clearance
|
|
uint16_t mAssumingHScrollbar:1; // parent frame is an nsIScrollableFrame and it
|
|
// is assuming a horizontal scrollbar
|
|
uint16_t mAssumingVScrollbar:1; // parent frame is an nsIScrollableFrame and it
|
|
// is assuming a vertical scrollbar
|
|
|
|
uint16_t mHResize:1; // Is frame (a) not dirty and (b) a
|
|
// different width than before?
|
|
|
|
uint16_t mVResize:1; // Is frame (a) not dirty and (b) a
|
|
// different height than before or
|
|
// (potentially) in a context where
|
|
// percent heights have a different
|
|
// basis?
|
|
uint16_t mTableIsSplittable:1; // tables are splittable, this should happen only inside a page
|
|
// and never insider a column frame
|
|
uint16_t mHeightDependsOnAncestorCell:1; // Does frame height depend on
|
|
// an ancestor table-cell?
|
|
uint16_t mIsColumnBalancing:1; // nsColumnSetFrame is balancing columns
|
|
uint16_t mIsFlexContainerMeasuringHeight:1; // nsFlexContainerFrame is
|
|
// reflowing this child to
|
|
// measure its intrinsic height.
|
|
uint16_t mDummyParentReflowState:1; // a "fake" reflow state made
|
|
// in order to be the parent
|
|
// of a real one
|
|
uint16_t mMustReflowPlaceholders:1; // Should this frame reflow its place-
|
|
// holder children? If the available
|
|
// height of this frame didn't change,
|
|
// but its in a paginated environment
|
|
// (e.g. columns), it should always
|
|
// reflow its placeholder children.
|
|
} mFlags;
|
|
|
|
// Note: The copy constructor is written by the compiler automatically. You
|
|
// can use that and then override specific values if you want, or you can
|
|
// call Init as desired...
|
|
|
|
/**
|
|
* Initialize a ROOT reflow state.
|
|
*
|
|
* @param aPresContext Must be equal to aFrame->PresContext().
|
|
* @param aFrame The frame for whose reflow state is being constructed.
|
|
* @param aRenderingContext The rendering context to be used for measurements.
|
|
* @param aAvailableSpace See comments for availableHeight and availableWidth
|
|
* members.
|
|
* @param aFlags A set of flags used for additional boolean parameters (see
|
|
* below).
|
|
*/
|
|
nsHTMLReflowState(nsPresContext* aPresContext,
|
|
nsIFrame* aFrame,
|
|
nsRenderingContext* aRenderingContext,
|
|
const nsSize& aAvailableSpace,
|
|
uint32_t aFlags = 0);
|
|
|
|
/**
|
|
* Initialize a reflow state for a child frame's reflow. Some parts of the
|
|
* state are copied from the parent's reflow state. The remainder is computed.
|
|
*
|
|
* @param aPresContext Must be equal to aFrame->PresContext().
|
|
* @param aParentReflowState A reference to an nsHTMLReflowState object that
|
|
* is to be the parent of this object.
|
|
* @param aFrame The frame for whose reflow state is being constructed.
|
|
* @param aAvailableSpace See comments for availableHeight and availableWidth
|
|
* members.
|
|
* @param aContainingBlockWidth An optional width, in app units, that is used
|
|
* by absolute positioning code to override default containing block
|
|
* width.
|
|
* @param aContainingBlockHeight An optional height, in app units, that is
|
|
* used by absolute positioning code to override default containing
|
|
* block height.
|
|
* @param aFlags A set of flags used for additional boolean parameters (see
|
|
* below).
|
|
*/
|
|
nsHTMLReflowState(nsPresContext* aPresContext,
|
|
const nsHTMLReflowState& aParentReflowState,
|
|
nsIFrame* aFrame,
|
|
const nsSize& aAvailableSpace,
|
|
nscoord aContainingBlockWidth = -1,
|
|
nscoord aContainingBlockHeight = -1,
|
|
uint32_t aFlags = 0);
|
|
|
|
// Values for |aFlags| passed to constructor
|
|
enum {
|
|
// Indicates that the parent of this reflow state is "fake" (see
|
|
// mDummyParentReflowState in mFlags).
|
|
DUMMY_PARENT_REFLOW_STATE = (1<<0),
|
|
|
|
// Indicates that the calling function will initialize the reflow state, and
|
|
// that the constructor should not call Init().
|
|
CALLER_WILL_INIT = (1<<1)
|
|
};
|
|
|
|
// This method initializes various data members. It is automatically
|
|
// called by the various constructors
|
|
void Init(nsPresContext* aPresContext,
|
|
nscoord aContainingBlockWidth = -1,
|
|
nscoord aContainingBlockHeight = -1,
|
|
const nsMargin* aBorder = nullptr,
|
|
const nsMargin* aPadding = nullptr);
|
|
/**
|
|
* Find the content width of the containing block of aReflowState
|
|
*/
|
|
static nscoord
|
|
GetContainingBlockContentWidth(const nsHTMLReflowState* aReflowState);
|
|
|
|
/**
|
|
* Calculate the used line-height property. The return value will be >= 0.
|
|
*/
|
|
nscoord CalcLineHeight() const;
|
|
|
|
/**
|
|
* Same as CalcLineHeight() above, but doesn't need a reflow state.
|
|
*
|
|
* @param aBlockHeight The computed height of the content rect of the block
|
|
* that the line should fill.
|
|
* Only used with line-height:-moz-block-height.
|
|
* NS_AUTOHEIGHT results in a normal line-height for
|
|
* line-height:-moz-block-height.
|
|
* @param aFontSizeInflation The result of the appropriate
|
|
* nsLayoutUtils::FontSizeInflationFor call,
|
|
* or 1.0 if during intrinsic size
|
|
* calculation.
|
|
*/
|
|
static nscoord CalcLineHeight(nsStyleContext* aStyleContext,
|
|
nscoord aBlockHeight,
|
|
float aFontSizeInflation);
|
|
|
|
|
|
void ComputeContainingBlockRectangle(nsPresContext* aPresContext,
|
|
const nsHTMLReflowState* aContainingBlockRS,
|
|
nscoord& aContainingBlockWidth,
|
|
nscoord& aContainingBlockHeight);
|
|
|
|
/**
|
|
* Apply the mComputed(Min/Max)Width constraints to the content
|
|
* size computed so far.
|
|
*/
|
|
nscoord ApplyMinMaxWidth(nscoord aWidth) const {
|
|
if (NS_UNCONSTRAINEDSIZE != ComputedMaxWidth()) {
|
|
aWidth = std::min(aWidth, ComputedMaxWidth());
|
|
}
|
|
return std::max(aWidth, ComputedMinWidth());
|
|
}
|
|
|
|
/**
|
|
* Apply the mComputed(Min/Max)Height constraints to the content
|
|
* size computed so far.
|
|
*
|
|
* @param aHeight The height that we've computed an to which we want to apply
|
|
* min/max constraints.
|
|
* @param aConsumed The amount of the computed height that was consumed by
|
|
* our prev-in-flows.
|
|
*/
|
|
nscoord ApplyMinMaxHeight(nscoord aHeight, nscoord aConsumed = 0) const {
|
|
aHeight += aConsumed;
|
|
|
|
if (NS_UNCONSTRAINEDSIZE != ComputedMaxHeight()) {
|
|
aHeight = std::min(aHeight, ComputedMaxHeight());
|
|
}
|
|
|
|
if (NS_UNCONSTRAINEDSIZE != ComputedMinHeight()) {
|
|
aHeight = std::max(aHeight, ComputedMinHeight());
|
|
}
|
|
|
|
return aHeight - aConsumed;
|
|
}
|
|
|
|
bool ShouldReflowAllKids() const {
|
|
// Note that we could make a stronger optimization for mVResize if
|
|
// we use it in a ShouldReflowChild test that replaces the current
|
|
// checks of NS_FRAME_IS_DIRTY | NS_FRAME_HAS_DIRTY_CHILDREN, if it
|
|
// were tested there along with NS_FRAME_CONTAINS_RELATIVE_HEIGHT.
|
|
// This would need to be combined with a slight change in which
|
|
// frames NS_FRAME_CONTAINS_RELATIVE_HEIGHT is marked on.
|
|
return (frame->GetStateBits() & NS_FRAME_IS_DIRTY) ||
|
|
mFlags.mHResize ||
|
|
(mFlags.mVResize &&
|
|
(frame->GetStateBits() & NS_FRAME_CONTAINS_RELATIVE_HEIGHT));
|
|
}
|
|
|
|
// This method doesn't apply min/max computed widths to the value passed in.
|
|
void SetComputedWidth(nscoord aComputedWidth);
|
|
|
|
// This method doesn't apply min/max computed heights to the value passed in.
|
|
void SetComputedHeight(nscoord aComputedHeight);
|
|
|
|
void SetComputedHeightWithoutResettingResizeFlags(nscoord aComputedHeight) {
|
|
// Viewport frames reset the computed height on a copy of their reflow
|
|
// state when reflowing fixed-pos kids. In that case we actually don't
|
|
// want to mess with the resize flags, because comparing the frame's rect
|
|
// to the munged computed width is pointless.
|
|
ComputedHeight() = aComputedHeight;
|
|
}
|
|
|
|
void SetTruncated(const nsHTMLReflowMetrics& aMetrics, nsReflowStatus* aStatus) const;
|
|
|
|
bool WillReflowAgainForClearance() const {
|
|
return mDiscoveredClearance && *mDiscoveredClearance;
|
|
}
|
|
|
|
// Compute the offsets for a relative position element
|
|
static void ComputeRelativeOffsets(uint8_t aCBDirection,
|
|
nsIFrame* aFrame,
|
|
nscoord aContainingBlockWidth,
|
|
nscoord aContainingBlockHeight,
|
|
nsMargin& aComputedOffsets);
|
|
|
|
// If a relatively positioned element, adjust the position appropriately.
|
|
static void ApplyRelativePositioning(nsIFrame* aFrame,
|
|
const nsMargin& aComputedOffsets,
|
|
nsPoint* aPosition);
|
|
|
|
void ApplyRelativePositioning(nsPoint* aPosition) const {
|
|
ApplyRelativePositioning(frame, ComputedPhysicalOffsets(), aPosition);
|
|
}
|
|
|
|
#ifdef DEBUG
|
|
// Reflow trace methods. Defined in nsFrame.cpp so they have access
|
|
// to the display-reflow infrastructure.
|
|
static void* DisplayInitConstraintsEnter(nsIFrame* aFrame,
|
|
nsHTMLReflowState* aState,
|
|
nscoord aCBWidth,
|
|
nscoord aCBHeight,
|
|
const nsMargin* aBorder,
|
|
const nsMargin* aPadding);
|
|
static void DisplayInitConstraintsExit(nsIFrame* aFrame,
|
|
nsHTMLReflowState* aState,
|
|
void* aValue);
|
|
static void* DisplayInitFrameTypeEnter(nsIFrame* aFrame,
|
|
nsHTMLReflowState* aState);
|
|
static void DisplayInitFrameTypeExit(nsIFrame* aFrame,
|
|
nsHTMLReflowState* aState,
|
|
void* aValue);
|
|
#endif
|
|
|
|
protected:
|
|
void InitFrameType(nsIAtom* aFrameType);
|
|
void InitCBReflowState();
|
|
void InitResizeFlags(nsPresContext* aPresContext, nsIAtom* aFrameType);
|
|
|
|
void InitConstraints(nsPresContext* aPresContext,
|
|
nscoord aContainingBlockWidth,
|
|
nscoord aContainingBlockHeight,
|
|
const nsMargin* aBorder,
|
|
const nsMargin* aPadding,
|
|
nsIAtom* aFrameType);
|
|
|
|
// Returns the nearest containing block or block frame (whether or not
|
|
// it is a containing block) for the specified frame. Also returns
|
|
// the left edge and width of the containing block's content area.
|
|
// These are returned in the coordinate space of the containing block.
|
|
nsIFrame* GetHypotheticalBoxContainer(nsIFrame* aFrame,
|
|
nscoord& aCBLeftEdge,
|
|
nscoord& aCBWidth);
|
|
|
|
void CalculateHypotheticalBox(nsPresContext* aPresContext,
|
|
nsIFrame* aPlaceholderFrame,
|
|
nsIFrame* aContainingBlock,
|
|
nscoord aBlockLeftContentEdge,
|
|
nscoord aBlockContentWidth,
|
|
const nsHTMLReflowState* cbrs,
|
|
nsHypotheticalBox& aHypotheticalBox,
|
|
nsIAtom* aFrameType);
|
|
|
|
void InitAbsoluteConstraints(nsPresContext* aPresContext,
|
|
const nsHTMLReflowState* cbrs,
|
|
nscoord aContainingBlockWidth,
|
|
nscoord aContainingBlockHeight,
|
|
nsIAtom* aFrameType);
|
|
|
|
// Calculates the computed values for the 'min-Width', 'max-Width',
|
|
// 'min-Height', and 'max-Height' properties, and stores them in the assorted
|
|
// data members
|
|
void ComputeMinMaxValues(nscoord aContainingBlockWidth,
|
|
nscoord aContainingBlockHeight,
|
|
const nsHTMLReflowState* aContainingBlockRS);
|
|
|
|
void CalculateHorizBorderPaddingMargin(nscoord aContainingBlockWidth,
|
|
nscoord* aInsideBoxSizing,
|
|
nscoord* aOutsideBoxSizing);
|
|
|
|
void CalculateBlockSideMargins(nscoord aAvailWidth,
|
|
nscoord aComputedWidth,
|
|
nsIAtom* aFrameType);
|
|
};
|
|
|
|
#endif /* nsHTMLReflowState_h___ */
|
|
|