зеркало из https://github.com/mozilla/gecko-dev.git
288 строки
9.3 KiB
C++
288 строки
9.3 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: MPL 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 Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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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 of the GNU General Public License Version 2 or later (the "GPL"),
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* or 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 MPL, 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 MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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/* struct containing the output from nsIFrame::Reflow */
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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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#include "nsBoundingMetrics.h"
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//----------------------------------------------------------------------
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// Option flags
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#define NS_REFLOW_CALC_BOUNDING_METRICS 0x0001
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/**
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* When we store overflow areas as an array of scrollable and visual
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* overflow, we use these indices.
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*
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* eOverflowType_LENGTH is needed (for gcc 4.5.*, at least) to ensure
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* that 2 is a valid value of nsOverflowType for use in
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* NS_FOR_FRAME_OVERFLOW_TYPES.
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*/
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enum nsOverflowType { eVisualOverflow, eScrollableOverflow,
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eOverflowType_LENGTH };
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#define NS_FOR_FRAME_OVERFLOW_TYPES(var_) \
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for (nsOverflowType var_ = nsOverflowType(0); var_ < 2; \
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var_ = nsOverflowType(var_ + 1))
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struct nsOverflowAreas {
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private:
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nsRect mRects[2];
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public:
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nsRect& Overflow(size_t aIndex) {
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NS_ASSERTION(0 <= aIndex && aIndex < 2, "index out of range");
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return mRects[aIndex];
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}
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const nsRect& Overflow(size_t aIndex) const {
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NS_ASSERTION(0 <= aIndex && aIndex < 2, "index out of range");
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return mRects[aIndex];
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}
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nsRect& VisualOverflow() { return mRects[eVisualOverflow]; }
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const nsRect& VisualOverflow() const { return mRects[eVisualOverflow]; }
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nsRect& ScrollableOverflow() { return mRects[eScrollableOverflow]; }
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const nsRect& ScrollableOverflow() const { return mRects[eScrollableOverflow]; }
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nsOverflowAreas() {
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// default-initializes to zero due to nsRect's default constructor
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}
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nsOverflowAreas(const nsRect& aVisualOverflow,
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const nsRect& aScrollableOverflow)
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{
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mRects[eVisualOverflow] = aVisualOverflow;
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mRects[eScrollableOverflow] = aScrollableOverflow;
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}
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nsOverflowAreas(const nsOverflowAreas& aOther) {
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*this = aOther;
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}
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nsOverflowAreas& operator=(const nsOverflowAreas& aOther) {
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mRects[0] = aOther.mRects[0];
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mRects[1] = aOther.mRects[1];
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return *this;
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}
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bool operator==(const nsOverflowAreas& aOther) const {
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// Scrollable overflow is a point-set rectangle and visual overflow
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// is a pixel-set rectangle.
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return VisualOverflow().IsEqualInterior(aOther.VisualOverflow()) &&
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ScrollableOverflow().IsEqualEdges(aOther.ScrollableOverflow());
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}
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bool operator!=(const nsOverflowAreas& aOther) const {
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return !(*this == aOther);
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}
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nsOverflowAreas operator+(const nsPoint& aPoint) const {
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nsOverflowAreas result(*this);
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result += aPoint;
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return result;
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}
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nsOverflowAreas& operator+=(const nsPoint& aPoint) {
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mRects[0] += aPoint;
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mRects[1] += aPoint;
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return *this;
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}
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void Clear() {
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mRects[0].SetRect(0, 0, 0, 0);
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mRects[1].SetRect(0, 0, 0, 0);
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}
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// Mutates |this| by unioning both overflow areas with |aOther|.
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void UnionWith(const nsOverflowAreas& aOther);
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// Mutates |this| by unioning both overflow areas with |aRect|.
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void UnionAllWith(const nsRect& aRect);
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// Mutates |this| by setting both overflow areas to |aRect|.
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void SetAllTo(const nsRect& aRect);
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};
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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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bool operator==(const nsCollapsingMargin& aOther)
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{
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return mMostPos == aOther.mMostPos &&
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mMostNeg == aOther.mMostNeg;
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}
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bool operator!=(const nsCollapsingMargin& aOther)
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{
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return !(*this == aOther);
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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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bool 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 (border-box)
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nscoord ascent; // [OUT] baseline (from top), or ASK_FOR_BASELINE
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PRUint32 mFlags;
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enum { ASK_FOR_BASELINE = nscoord_MAX };
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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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// 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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// (HasOverflowAreas() is true) these rectangles represent the total
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// area of the frame including visible overflow, i.e., don't include
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// overflowing content that is hidden. The rects are in the local
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// coordinate space of the frame, and should be at least as big as the
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// desired size. If there is no content that overflows, then the
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// overflow area is identical to the desired size and should be {0, 0,
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// width, height}.
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nsOverflowAreas mOverflowAreas;
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nsRect& VisualOverflow()
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{ return mOverflowAreas.VisualOverflow(); }
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const nsRect& VisualOverflow() const
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{ return mOverflowAreas.VisualOverflow(); }
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nsRect& ScrollableOverflow()
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{ return mOverflowAreas.ScrollableOverflow(); }
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const nsRect& ScrollableOverflow() const
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{ return mOverflowAreas.ScrollableOverflow(); }
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// Set all of mOverflowAreas to (0, 0, width, height).
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void SetOverflowAreasToDesiredBounds();
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// Union all of mOverflowAreas with (0, 0, width, height).
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void UnionOverflowAreasWithDesiredBounds();
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// XXXldb Should |aFlags| generally be passed from parent to child?
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// Some places do it, and some don't. |aFlags| should perhaps go away
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// entirely.
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// XXX width/height/ascent are OUT parameters and so they shouldn't
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// have to be initialized, but there are some bad frame classes that
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// aren't properly setting them when returning from Reflow()...
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nsHTMLReflowMetrics(PRUint32 aFlags = 0)
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: width(0), height(0), ascent(ASK_FOR_BASELINE), mFlags(aFlags)
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{}
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};
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#endif /* nsHTMLReflowMetrics_h___ */
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