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gecko-dev/layout/mathml/nsMathMLContainerFrame.h

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is Mozilla MathML Project.
*
* The Initial Developer of the Original Code is
* The University Of Queensland.
* Portions created by the Initial Developer are Copyright (C) 1999
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* Roger B. Sidje <rbs@maths.uq.edu.au>
* David J. Fiddes <D.J.Fiddes@hw.ac.uk>
* Shyjan Mahamud <mahamud@cs.cmu.edu> (added TeX rendering rules)
* Karl Tomlinson <karlt+@karlt.net>, Mozilla Corporation
*
* Alternatively, the contents of this file may be used under the terms of
* either of the GNU General Public License Version 2 or later (the "GPL"),
* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
#ifndef nsMathMLContainerFrame_h___
#define nsMathMLContainerFrame_h___
#include "nsCOMPtr.h"
#include "nsHTMLContainerFrame.h"
#include "nsBlockFrame.h"
#include "nsInlineFrame.h"
#include "nsMathMLAtoms.h"
#include "nsMathMLOperators.h"
#include "nsMathMLChar.h"
#include "nsMathMLFrame.h"
#include "nsMathMLParts.h"
/*
* Base class for MathML container frames. It acts like an inferred
* mrow. By default, this frame uses its Reflow() method to lay its
* children horizontally and ensure that their baselines are aligned.
* The Reflow() method relies upon Place() to position children.
* By overloading Place() in derived classes, it is therefore possible
* to position children in various customized ways.
*/
// Options for the preferred size at which to stretch our stretchy children
#define STRETCH_CONSIDER_ACTUAL_SIZE 0x00000001 // just use our current size
#define STRETCH_CONSIDER_EMBELLISHMENTS 0x00000002 // size calculations include embellishments
class nsMathMLContainerFrame : public nsHTMLContainerFrame,
public nsMathMLFrame {
friend class nsMathMLmfencedFrame;
public:
nsMathMLContainerFrame(nsStyleContext* aContext) : nsHTMLContainerFrame(aContext) {}
NS_DECL_QUERYFRAME
NS_DECL_FRAMEARENA_HELPERS
// --------------------------------------------------------------------------
// Overloaded nsMathMLFrame methods -- see documentation in nsIMathMLFrame.h
NS_IMETHOD
Stretch(nsIRenderingContext& aRenderingContext,
nsStretchDirection aStretchDirection,
nsBoundingMetrics& aContainerSize,
nsHTMLReflowMetrics& aDesiredStretchSize);
NS_IMETHOD
UpdatePresentationDataFromChildAt(PRInt32 aFirstIndex,
PRInt32 aLastIndex,
PRUint32 aFlagsValues,
PRUint32 aFlagsToUpdate)
{
PropagatePresentationDataFromChildAt(this, aFirstIndex, aLastIndex,
aFlagsValues, aFlagsToUpdate);
return NS_OK;
}
// helper to set the "increment script level" flag on the element belonging
// to a child frame given by aChildIndex.
// When this flag is set, the style system will increment the scriptlevel
// for the child element. This is needed for situations where the style system
// cannot itself determine the scriptlevel (mfrac, munder, mover, munderover).
// This should be called during reflow. We set the flag and if it changed,
// we request appropriate restyling and also queue a post-reflow callback
// to ensure that restyle and reflow happens immediately after the current
// reflow.
void
SetIncrementScriptLevel(PRInt32 aChildIndex, PRBool aIncrement);
// --------------------------------------------------------------------------
// Overloaded nsHTMLContainerFrame methods -- see documentation in nsIFrame.h
virtual PRBool IsFrameOfType(PRUint32 aFlags) const
{
return !(aFlags & nsIFrame::eLineParticipant) &&
nsHTMLContainerFrame::IsFrameOfType(aFlags &
~(nsIFrame::eMathML | nsIFrame::eExcludesIgnorableWhitespace));
}
virtual PRIntn GetSkipSides() const { return 0; }
NS_IMETHOD
AppendFrames(nsIAtom* aListName,
nsFrameList& aFrameList);
NS_IMETHOD
InsertFrames(nsIAtom* aListName,
nsIFrame* aPrevFrame,
nsFrameList& aFrameList);
NS_IMETHOD
RemoveFrame(nsIAtom* aListName,
nsIFrame* aOldFrame);
/**
* Both GetMinWidth and GetPrefWidth return whatever
* GetIntrinsicWidth returns.
*/
virtual nscoord GetMinWidth(nsIRenderingContext *aRenderingContext);
virtual nscoord GetPrefWidth(nsIRenderingContext *aRenderingContext);
/**
* Return the intrinsic width of the frame's content area.
*/
virtual nscoord GetIntrinsicWidth(nsIRenderingContext *aRenderingContext);
NS_IMETHOD
Reflow(nsPresContext* aPresContext,
nsHTMLReflowMetrics& aDesiredSize,
const nsHTMLReflowState& aReflowState,
nsReflowStatus& aStatus);
NS_IMETHOD
WillReflow(nsPresContext* aPresContext)
{
mPresentationData.flags &= ~NS_MATHML_ERROR;
return nsHTMLContainerFrame::WillReflow(aPresContext);
}
NS_IMETHOD
DidReflow(nsPresContext* aPresContext,
const nsHTMLReflowState* aReflowState,
nsDidReflowStatus aStatus)
{
mPresentationData.flags &= ~NS_MATHML_STRETCH_DONE;
return nsHTMLContainerFrame::DidReflow(aPresContext, aReflowState, aStatus);
}
NS_IMETHOD BuildDisplayList(nsDisplayListBuilder* aBuilder,
const nsRect& aDirtyRect,
const nsDisplayListSet& aLists);
// Notification when an attribute is changed. The MathML module uses the
// following paradigm:
//
// 1. If the MathML frame class doesn't have any cached automatic data that
// depends on the attribute: we just reflow (e.g., this happens with <msub>,
// <msup>, <mmultiscripts>, etc). This is the default behavior implemented
// by this base class.
//
// 2. If the MathML frame class has cached automatic data that depends on
// the attribute:
// 2a. If the automatic data to update resides only within the descendants,
// we just re-layout them using ReLayoutChildren(this);
// (e.g., this happens with <ms>).
// 2b. If the automatic data to update affects us in some way, we ask our parent
// to re-layout its children using ReLayoutChildren(mParent);
// Therefore, there is an overhead here in that our siblings are re-laid
// too (e.g., this happens with <mstyle>, <munder>, <mover>, <munderover>).
NS_IMETHOD
AttributeChanged(PRInt32 aNameSpaceID,
nsIAtom* aAttribute,
PRInt32 aModType);
// --------------------------------------------------------------------------
// Additional methods
protected:
/* Place :
* This method is used to measure or position child frames and other
* elements. It may be called any number of times with aPlaceOrigin
* false to measure, and the final call of the Reflow process before
* returning from Reflow() or Stretch() will have aPlaceOrigin true
* to position the elements.
*
* IMPORTANT: This method uses GetReflowAndBoundingMetricsFor() which must
* have been set up with SaveReflowAndBoundingMetricsFor().
*
* The Place() method will use this information to compute the desired size
* of the frame.
*
* @param aPlaceOrigin [in]
* If aPlaceOrigin is false, compute your desired size using the
* information from GetReflowAndBoundingMetricsFor. However, child
* frames or other elements should not be repositioned.
*
* If aPlaceOrigin is true, reflow is finished. You should position
* all your children, and return your desired size. You should now
* use FinishReflowChild() on your children to complete post-reflow
* operations.
*
* @param aDesiredSize [out] parameter where you should return your desired
* size and your ascent/descent info. Compute your desired size using
* the information from GetReflowAndBoundingMetricsFor, and include
* any space you want for border/padding in the desired size you
* return.
*/
virtual nsresult
Place(nsIRenderingContext& aRenderingContext,
PRBool aPlaceOrigin,
nsHTMLReflowMetrics& aDesiredSize);
// MeasureForWidth:
//
// A method used by nsMathMLContainerFrame::GetIntrinsicWidth to get the
// width that a particular Place method desires. For most frames, this will
// just call the object's Place method. However <msqrt> and <menclose> use
// nsMathMLContainerFrame::GetIntrinsicWidth to measure the child frames as
// if in an <mrow>, and so their frames implement MeasureForWidth to use
// nsMathMLContainerFrame::Place.
virtual nsresult
MeasureForWidth(nsIRenderingContext& aRenderingContext,
nsHTMLReflowMetrics& aDesiredSize);
// helper to re-sync the automatic data in our children and notify our parent to
// reflow us when changes (e.g., append/insert/remove) happen in our child list
virtual nsresult
ChildListChanged(PRInt32 aModType);
// helper to get the preferred size that a container frame should use to fire
// the stretch on its stretchy child frames.
void
GetPreferredStretchSize(nsIRenderingContext& aRenderingContext,
PRUint32 aOptions,
nsStretchDirection aStretchDirection,
nsBoundingMetrics& aPreferredStretchSize);
public:
// error handlers to provide a visual feedback to the user when an error
// (typically invalid markup) was encountered during reflow.
nsresult
ReflowError(nsIRenderingContext& aRenderingContext,
nsHTMLReflowMetrics& aDesiredSize);
// helper method to reflow a child frame. We are inline frames, and we don't
// know our positions until reflow is finished. That's why we ask the
// base method not to worry about our position.
nsresult
ReflowChild(nsIFrame* aKidFrame,
nsPresContext* aPresContext,
nsHTMLReflowMetrics& aDesiredSize,
const nsHTMLReflowState& aReflowState,
nsReflowStatus& aStatus);
protected:
// helper to add the inter-spacing when <math> is the immediate parent.
// Since we don't (yet) handle the root <math> element ourselves, we need to
// take special care of the inter-frame spacing on elements for which <math>
// is the direct xml parent. This function will be repeatedly called from
// left to right on the childframes of <math>, and by so doing it will
// emulate the spacing that would have been done by a <mrow> container.
// e.g., it fixes <math> <mi>f</mi> <mo>q</mo> <mi>f</mi> <mo>I</mo> </math>
virtual nscoord
FixInterFrameSpacing(nsHTMLReflowMetrics& aDesiredSize);
// helper method to complete the post-reflow hook and ensure that embellished
// operators don't terminate their Reflow without receiving a Stretch command.
virtual nsresult
FinalizeReflow(nsIRenderingContext& aRenderingContext,
nsHTMLReflowMetrics& aDesiredSize);
// Record metrics of a child frame for recovery through the following method
static void
SaveReflowAndBoundingMetricsFor(nsIFrame* aFrame,
const nsHTMLReflowMetrics& aReflowMetrics,
const nsBoundingMetrics& aBoundingMetrics);
// helper method to facilitate getting the reflow and bounding metrics of a
// child frame. The argument aMathMLFrameType, when non null, will return
// the 'type' of the frame, which is used to determine the inter-frame
// spacing.
// IMPORTANT: This function is only meant to be called in Place() methods as
// the information is available only when set up with the above method
// during Reflow/Stretch() and GetPrefWidth().
static void
GetReflowAndBoundingMetricsFor(nsIFrame* aFrame,
nsHTMLReflowMetrics& aReflowMetrics,
nsBoundingMetrics& aBoundingMetrics,
eMathMLFrameType* aMathMLFrameType = nsnull);
// helper method to clear metrics saved with
// SaveReflowAndBoundingMetricsFor() from all child frames.
void ClearSavedChildMetrics();
// helper to let the update of presentation data pass through
// a subtree that may contain non-MathML container frames
static void
PropagatePresentationDataFor(nsIFrame* aFrame,
PRUint32 aFlagsValues,
PRUint32 aFlagsToUpdate);
public:
static void
PropagatePresentationDataFromChildAt(nsIFrame* aParentFrame,
PRInt32 aFirstChildIndex,
PRInt32 aLastChildIndex,
PRUint32 aFlagsValues,
PRUint32 aFlagsToUpdate);
// helper to let the rebuild of automatic data (presentation data
// and embellishement data) walk through a subtree that may contain
// non-MathML container frames. Note that this method re-builds the
// automatic data in the children -- not in aParentFrame itself (except
// for those particular operations that the parent frame may do in its
// TransmitAutomaticData()). The reason it works this way is because
// a container frame knows what it wants for its children, whereas children
// have no clue who their parent is. For example, it is <mfrac> who knows
// that its children have to be in scriptsizes, and has to transmit this
// information to them. Hence, when changes occur in a child frame, the child
// has to request the re-build from its parent. Unfortunately, the extra cost
// for this is that it will re-sync in the siblings of the child as well.
static void
RebuildAutomaticDataForChildren(nsIFrame* aParentFrame);
// helper to blow away the automatic data cached in a frame's subtree and
// re-layout its subtree to reflect changes that may have happen. In the
// event where aParentFrame isn't a MathML frame, it will first walk up to
// the ancestor that is a MathML frame, and re-layout from there -- this is
// to guarantee that automatic data will be rebuilt properly. Note that this
// method re-builds the automatic data in the children -- not in the parent
// frame itself (except for those particular operations that the parent frame
// may do do its TransmitAutomaticData()). @see RebuildAutomaticDataForChildren
//
// aBits are the bits to pass to FrameNeedsReflow() when we call it.
static nsresult
ReLayoutChildren(nsIFrame* aParentFrame);
protected:
// Helper method which positions child frames as an <mrow> on given baseline
// y = aBaseline starting from x = aOffsetX, calling FinishReflowChild()
// on the frames.
void
PositionRowChildFrames(nscoord aOffsetX, nscoord aBaseline);
// A variant on FinishAndStoreOverflow() that uses the union of child
// overflows, the frame bounds, and mBoundingMetrics to set and store the
// overflow.
void GatherAndStoreOverflow(nsHTMLReflowMetrics* aMetrics);
/**
* Call DidReflow() if the NS_FRAME_IN_REFLOW frame bit is set on aFirst and
* all its next siblings up to, but not including, aStop.
* aStop == nsnull meaning all next siblings with the bit set.
* The method does nothing if aFirst == nsnull.
*/
static void DidReflowChildren(nsIFrame* aFirst, nsIFrame* aStop = nsnull);
private:
class RowChildFrameIterator;
friend class RowChildFrameIterator;
};
// --------------------------------------------------------------------------
// Currently, to benefit from line-breaking inside the <math> element, <math> is
// simply mapping to nsBlockFrame or nsInlineFrame.
// A separate implemention needs to provide:
// 1) line-breaking
// 2) proper inter-frame spacing
// 3) firing of Stretch() (in which case FinalizeReflow() would have to be cleaned)
// Issues: If/when mathml becomes a pluggable component, the separation will be needed.
class nsMathMLmathBlockFrame : public nsBlockFrame {
public:
NS_DECL_FRAMEARENA_HELPERS
friend nsIFrame* NS_NewMathMLmathBlockFrame(nsIPresShell* aPresShell,
nsStyleContext* aContext, PRUint32 aFlags);
// beware, mFrames is not set by nsBlockFrame
// cannot use mFrames{.FirstChild()|.etc} since the block code doesn't set mFrames
NS_IMETHOD
SetInitialChildList(nsIAtom* aListName,
nsFrameList& aChildList)
{
NS_ASSERTION(!aListName, "unexpected frame list");
nsresult rv = nsBlockFrame::SetInitialChildList(aListName, aChildList);
// re-resolve our subtree to set any mathml-expected data
nsMathMLContainerFrame::RebuildAutomaticDataForChildren(this);
return rv;
}
NS_IMETHOD
AppendFrames(nsIAtom* aListName,
nsFrameList& aFrameList)
{
NS_ASSERTION(!aListName || nsGkAtoms::nextBidi == aListName,
"unexpected frame list");
nsresult rv = nsBlockFrame::AppendFrames(aListName, aFrameList);
if (NS_LIKELY(!aListName))
nsMathMLContainerFrame::ReLayoutChildren(this);
return rv;
}
NS_IMETHOD
InsertFrames(nsIAtom* aListName,
nsIFrame* aPrevFrame,
nsFrameList& aFrameList)
{
NS_ASSERTION(!aListName || nsGkAtoms::nextBidi == aListName,
"unexpected frame list");
nsresult rv = nsBlockFrame::InsertFrames(aListName, aPrevFrame, aFrameList);
if (NS_LIKELY(!aListName))
nsMathMLContainerFrame::ReLayoutChildren(this);
return rv;
}
NS_IMETHOD
RemoveFrame(nsIAtom* aListName,
nsIFrame* aOldFrame)
{
NS_ASSERTION(!aListName || nsGkAtoms::nextBidi == aListName,
"unexpected frame list");
nsresult rv = nsBlockFrame::RemoveFrame(aListName, aOldFrame);
if (NS_LIKELY(!aListName))
nsMathMLContainerFrame::ReLayoutChildren(this);
return rv;
}
virtual PRBool IsFrameOfType(PRUint32 aFlags) const {
return nsBlockFrame::IsFrameOfType(aFlags &
~(nsIFrame::eMathML | nsIFrame::eExcludesIgnorableWhitespace));
}
protected:
nsMathMLmathBlockFrame(nsStyleContext* aContext) : nsBlockFrame(aContext) {
// We should always have a float manager. Not that things can really try
// to float out of us anyway, but we need one for line layout.
AddStateBits(NS_BLOCK_FLOAT_MGR);
}
virtual ~nsMathMLmathBlockFrame() {}
};
// --------------
class nsMathMLmathInlineFrame : public nsInlineFrame {
public:
NS_DECL_FRAMEARENA_HELPERS
friend nsIFrame* NS_NewMathMLmathInlineFrame(nsIPresShell* aPresShell, nsStyleContext* aContext);
NS_IMETHOD
SetInitialChildList(nsIAtom* aListName,
nsFrameList& aChildList)
{
NS_ASSERTION(!aListName, "unexpected frame list");
nsresult rv = nsInlineFrame::SetInitialChildList(aListName, aChildList);
// re-resolve our subtree to set any mathml-expected data
nsMathMLContainerFrame::RebuildAutomaticDataForChildren(this);
return rv;
}
NS_IMETHOD
AppendFrames(nsIAtom* aListName,
nsFrameList& aFrameList)
{
NS_ASSERTION(!aListName || nsGkAtoms::nextBidi == aListName,
"unexpected frame list");
nsresult rv = nsInlineFrame::AppendFrames(aListName, aFrameList);
if (NS_LIKELY(!aListName))
nsMathMLContainerFrame::ReLayoutChildren(this);
return rv;
}
NS_IMETHOD
InsertFrames(nsIAtom* aListName,
nsIFrame* aPrevFrame,
nsFrameList& aFrameList)
{
NS_ASSERTION(!aListName || nsGkAtoms::nextBidi == aListName,
"unexpected frame list");
nsresult rv = nsInlineFrame::InsertFrames(aListName, aPrevFrame, aFrameList);
if (NS_LIKELY(!aListName))
nsMathMLContainerFrame::ReLayoutChildren(this);
return rv;
}
NS_IMETHOD
RemoveFrame(nsIAtom* aListName,
nsIFrame* aOldFrame)
{
NS_ASSERTION(!aListName || nsGkAtoms::nextBidi == aListName,
"unexpected frame list");
nsresult rv = nsInlineFrame::RemoveFrame(aListName, aOldFrame);
if (NS_LIKELY(!aListName))
nsMathMLContainerFrame::ReLayoutChildren(this);
return rv;
}
virtual PRBool IsFrameOfType(PRUint32 aFlags) const {
return nsInlineFrame::IsFrameOfType(aFlags &
~(nsIFrame::eMathML | nsIFrame::eExcludesIgnorableWhitespace));
}
protected:
nsMathMLmathInlineFrame(nsStyleContext* aContext) : nsInlineFrame(aContext) {}
virtual ~nsMathMLmathInlineFrame() {}
};
#endif /* nsMathMLContainerFrame_h___ */
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