зеркало из https://github.com/mozilla/pjs.git
216 строки
7.0 KiB
C++
216 строки
7.0 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* ***** BEGIN LICENSE BLOCK *****
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* Version: NPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Netscape Public License
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* Version 1.1 (the "License"); you may not use this file except in
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* compliance with the License. You may obtain a copy of the License at
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* http://www.mozilla.org/NPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is mozilla.org code.
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*
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* The Initial Developer of the Original Code is
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* Netscape Communications Corporation.
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* Portions created by the Initial Developer are Copyright (C) 1998
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either the GNU General Public License Version 2 or later (the "GPL"), or
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* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the NPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the NPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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#ifndef nsHTMLReflowMetrics_h___
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#define nsHTMLReflowMetrics_h___
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#include <stdio.h>
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#include "nsISupports.h"
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#include "nsMargin.h"
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#include "nsRect.h"
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// for MOZ_MATHML
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#include "nsIRenderingContext.h" //to get struct nsBoundingMetrics
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//----------------------------------------------------------------------
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// Option flags
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#define NS_REFLOW_CALC_MAX_WIDTH 0x0001
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#ifdef MOZ_MATHML
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#define NS_REFLOW_CALC_BOUNDING_METRICS 0x0002
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#endif
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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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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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PRBool 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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struct nsHTMLReflowMetrics {
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nscoord width, height; // [OUT] desired width and height
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nscoord ascent, descent; // [OUT] ascent and descent information
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nscoord mMaxElementWidth; // [OUT]
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// Used for incremental reflow. If the NS_REFLOW_CALC_MAX_WIDTH flag is set,
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// then the caller is requesting that you update and return your maximum width
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nscoord mMaximumWidth; // [OUT]
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#ifdef MOZ_MATHML
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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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#endif
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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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// (NS_FRAME_OUTSIDE_CHILDREN) this rectangle represents the total area
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// of the frame including visible overflow, i.e., don't include overflowing
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// content that is hidden.
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// The rect is in the local coordinate space of the frame, and should be at
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// least as big as the desired size. If there is no content that overflows,
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// then the overflow area is identical to the desired size and should be
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// {0, 0, mWidth, mHeight}.
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nsRect mOverflowArea;
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PRUint32 mFlags;
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// used by tables to optimize common cases
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PRPackedBool mNothingChanged;
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// Should we compute mMaxElementWidth?
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PRPackedBool mComputeMEW;
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nsHTMLReflowMetrics(PRBool aComputeMEW, PRUint32 aFlags = 0) {
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mComputeMEW = aComputeMEW;
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mMaxElementWidth = 0;
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mMaximumWidth = 0;
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mFlags = aFlags;
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mOverflowArea.x = 0;
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mOverflowArea.y = 0;
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mOverflowArea.width = 0;
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mOverflowArea.height = 0;
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mNothingChanged = PR_FALSE;
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#ifdef MOZ_MATHML
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mBoundingMetrics.Clear();
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#endif
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// XXX These are OUT parameters and so they shouldn't have to be
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// initialized, but there are some bad frame classes that aren't
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// properly setting them when returning from Reflow()...
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width = height = 0;
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ascent = descent = 0;
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}
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nsHTMLReflowMetrics& operator=(const nsHTMLReflowMetrics& aOther)
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{
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mMaxElementWidth = aOther.mMaxElementWidth;
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mMaximumWidth = aOther.mMaximumWidth;
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mFlags = aOther.mFlags;
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mCarriedOutBottomMargin = aOther.mCarriedOutBottomMargin;
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mOverflowArea.x = aOther.mOverflowArea.x;
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mOverflowArea.y = aOther.mOverflowArea.y;
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mOverflowArea.width = aOther.mOverflowArea.width;
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mOverflowArea.height = aOther.mOverflowArea.height;
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mNothingChanged = aOther.mNothingChanged;
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#ifdef MOZ_MATHML
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mBoundingMetrics = aOther.mBoundingMetrics;
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#endif
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width = aOther.width;
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height = aOther.height;
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ascent = aOther.ascent;
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descent = aOther.descent;
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return *this;
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}
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};
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#endif /* nsHTMLReflowMetrics_h___ */
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