зеркало из https://github.com/mozilla/gecko-dev.git
214 строки
6.8 KiB
C++
214 строки
6.8 KiB
C++
/* -*- 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.org code.
|
|
*
|
|
* The Initial Developer of the Original Code is
|
|
* Netscape Communications Corporation.
|
|
* Portions created by the Initial Developer are Copyright (C) 1998
|
|
* the Initial Developer. All Rights Reserved.
|
|
*
|
|
* Contributor(s):
|
|
*
|
|
* 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 ***** */
|
|
|
|
/* struct containing the output from nsIFrame::Reflow */
|
|
|
|
#ifndef nsHTMLReflowMetrics_h___
|
|
#define nsHTMLReflowMetrics_h___
|
|
|
|
#include <stdio.h>
|
|
#include "nsISupports.h"
|
|
#include "nsMargin.h"
|
|
#include "nsRect.h"
|
|
// for MOZ_MATHML
|
|
#include "nsIRenderingContext.h" //to get struct nsBoundingMetrics
|
|
|
|
//----------------------------------------------------------------------
|
|
|
|
// Option flags
|
|
#ifdef MOZ_MATHML
|
|
#define NS_REFLOW_CALC_BOUNDING_METRICS 0x0001
|
|
#endif
|
|
|
|
/**
|
|
* An nsCollapsingMargin represents a vertical collapsing margin between
|
|
* blocks as described in section 8.3.1 of CSS2,
|
|
* <URL: http://www.w3.org/TR/REC-CSS2/box.html#collapsing-margins >.
|
|
*
|
|
* All adjacent vertical margins collapse, and the resulting margin is
|
|
* the sum of the largest positive margin included and the smallest (most
|
|
* negative) negative margin included.
|
|
*/
|
|
struct nsCollapsingMargin {
|
|
private:
|
|
nscoord mMostPos; // the largest positive margin included
|
|
nscoord mMostNeg; // the smallest negative margin included
|
|
|
|
public:
|
|
nsCollapsingMargin()
|
|
: mMostPos(0),
|
|
mMostNeg(0)
|
|
{
|
|
}
|
|
|
|
nsCollapsingMargin(const nsCollapsingMargin& aOther)
|
|
: mMostPos(aOther.mMostPos),
|
|
mMostNeg(aOther.mMostNeg)
|
|
{
|
|
}
|
|
|
|
PRBool operator==(const nsCollapsingMargin& aOther)
|
|
{
|
|
return mMostPos == aOther.mMostPos &&
|
|
mMostNeg == aOther.mMostNeg;
|
|
}
|
|
|
|
PRBool operator!=(const nsCollapsingMargin& aOther)
|
|
{
|
|
return !(*this == aOther);
|
|
}
|
|
|
|
nsCollapsingMargin& operator=(const nsCollapsingMargin& aOther)
|
|
{
|
|
mMostPos = aOther.mMostPos;
|
|
mMostNeg = aOther.mMostNeg;
|
|
return *this;
|
|
}
|
|
|
|
void Include(nscoord aCoord)
|
|
{
|
|
if (aCoord > mMostPos)
|
|
mMostPos = aCoord;
|
|
else if (aCoord < mMostNeg)
|
|
mMostNeg = aCoord;
|
|
}
|
|
|
|
void Include(const nsCollapsingMargin& aOther)
|
|
{
|
|
if (aOther.mMostPos > mMostPos)
|
|
mMostPos = aOther.mMostPos;
|
|
if (aOther.mMostNeg < mMostNeg)
|
|
mMostNeg = aOther.mMostNeg;
|
|
}
|
|
|
|
void Zero()
|
|
{
|
|
mMostPos = 0;
|
|
mMostNeg = 0;
|
|
}
|
|
|
|
PRBool IsZero() const
|
|
{
|
|
return (mMostPos == 0) && (mMostNeg == 0);
|
|
}
|
|
|
|
nscoord get() const
|
|
{
|
|
return mMostPos + mMostNeg;
|
|
}
|
|
};
|
|
|
|
/**
|
|
* Reflow metrics used to return the frame's desired size and alignment
|
|
* information.
|
|
*
|
|
* @see #Reflow()
|
|
*/
|
|
struct nsHTMLReflowMetrics {
|
|
nscoord width, height; // [OUT] desired width and height (border-box)
|
|
nscoord ascent; // [OUT] baseline (from top), or ASK_FOR_BASELINE
|
|
|
|
enum { ASK_FOR_BASELINE = nscoord_MAX };
|
|
|
|
#ifdef MOZ_MATHML
|
|
// Metrics that _exactly_ enclose the text to allow precise MathML placements.
|
|
// If the NS_REFLOW_CALC_BOUNDING_METRICS flag is set, then the caller is
|
|
// requesting that you also compute additional details about your inner
|
|
// bounding box and italic correction. For example, the bounding box of
|
|
// msup is the smallest rectangle that _exactly_ encloses both the text
|
|
// of the base and the text of the superscript.
|
|
nsBoundingMetrics mBoundingMetrics; // [OUT]
|
|
#endif
|
|
|
|
// Carried out bottom margin values. This is the collapsed
|
|
// (generational) bottom margin value.
|
|
nsCollapsingMargin mCarriedOutBottomMargin;
|
|
|
|
// For frames that have content that overflow their content area
|
|
// (HasOverflowRect() is true) this rectangle represents the total area
|
|
// of the frame including visible overflow, i.e., don't include overflowing
|
|
// content that is hidden.
|
|
// The rect is in the local coordinate space of the frame, and should be at
|
|
// least as big as the desired size. If there is no content that overflows,
|
|
// then the overflow area is identical to the desired size and should be
|
|
// {0, 0, mWidth, mHeight}.
|
|
nsRect mOverflowArea;
|
|
|
|
PRUint32 mFlags;
|
|
|
|
// XXXldb Should |aFlags| generally be passed from parent to child?
|
|
// Some places do it, and some don't. |aFlags| should perhaps go away
|
|
// entirely.
|
|
nsHTMLReflowMetrics(PRUint32 aFlags = 0) {
|
|
mFlags = aFlags;
|
|
mOverflowArea.x = 0;
|
|
mOverflowArea.y = 0;
|
|
mOverflowArea.width = 0;
|
|
mOverflowArea.height = 0;
|
|
#ifdef MOZ_MATHML
|
|
mBoundingMetrics.Clear();
|
|
#endif
|
|
|
|
// XXX These are OUT parameters and so they shouldn't have to be
|
|
// initialized, but there are some bad frame classes that aren't
|
|
// properly setting them when returning from Reflow()...
|
|
width = height = 0;
|
|
ascent = ASK_FOR_BASELINE;
|
|
}
|
|
|
|
nsHTMLReflowMetrics& operator=(const nsHTMLReflowMetrics& aOther)
|
|
{
|
|
mFlags = aOther.mFlags;
|
|
mCarriedOutBottomMargin = aOther.mCarriedOutBottomMargin;
|
|
mOverflowArea.x = aOther.mOverflowArea.x;
|
|
mOverflowArea.y = aOther.mOverflowArea.y;
|
|
mOverflowArea.width = aOther.mOverflowArea.width;
|
|
mOverflowArea.height = aOther.mOverflowArea.height;
|
|
#ifdef MOZ_MATHML
|
|
mBoundingMetrics = aOther.mBoundingMetrics;
|
|
#endif
|
|
|
|
width = aOther.width;
|
|
height = aOther.height;
|
|
ascent = aOther.ascent;
|
|
return *this;
|
|
}
|
|
|
|
};
|
|
|
|
#endif /* nsHTMLReflowMetrics_h___ */
|