143 lines
4.8 KiB
C
143 lines
4.8 KiB
C
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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*
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* The contents of this file are subject to the Netscape Public
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* License Version 1.1 (the "License"); you may not use this file
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* except in compliance with the License. You may obtain a copy of
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* the License at http://www.mozilla.org/NPL/
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*
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* Software distributed under the License is distributed on an "AS
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* IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
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* implied. See the License for the specific language governing
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* rights and limitations under the 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 Netscape
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* Communications Corporation. Portions created by Netscape are
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* Copyright (C) 1998 Netscape Communications Corporation. All
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* Rights Reserved.
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*
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* Contributor(s):
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*/
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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 "nslayout.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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struct nsSize;
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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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* 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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// Set this to null if you don't need to compute the max element size
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nsSize* maxElementSize; // [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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nscoord 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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PRBool mNothingChanged;
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nsHTMLReflowMetrics(nsSize* aMaxElementSize, PRUint32 aFlags = 0) {
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maxElementSize = aMaxElementSize;
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mMaximumWidth = 0;
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mFlags = aFlags;
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mCarriedOutBottomMargin = 0;
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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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void AddBorderPaddingToMaxElementSize(const nsMargin& aBorderPadding) {
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maxElementSize->width += aBorderPadding.left + aBorderPadding.right;
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maxElementSize->height += aBorderPadding.top + aBorderPadding.bottom;
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}
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nsHTMLReflowMetrics& operator=(const nsHTMLReflowMetrics& aOther)
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{
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if (maxElementSize && aOther.maxElementSize) {
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maxElementSize->width = aOther.maxElementSize->width;
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maxElementSize->height = aOther.maxElementSize->height;
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}
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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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