зеркало из https://github.com/mozilla/pjs.git
131 строка
4.3 KiB
C++
131 строка
4.3 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 Communicator client code.
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*
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* The Initial Developer of the Original Code is Netscape Communications
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* 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 nsBlockBandData_h___
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#define nsBlockBandData_h___
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#include "nsISpaceManager.h"
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class nsIPresContext;
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// Number of builtin nsBandTrapezoid's
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#define NS_BLOCK_BAND_DATA_TRAPS 6
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/**
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* Class used to manage processing of the space-manager band data.
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* Provides HTML/CSS specific behavior to the raw data.
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*/
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class nsBlockBandData : public nsBandData {
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public:
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nsBlockBandData();
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~nsBlockBandData();
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// Initialize. This must be called before any of the other methods.
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nsresult Init(nsISpaceManager* aSpaceManager, const nsSize& aSpace);
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// Get some available space. Note that aY is relative to the current
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// space manager translation.
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nsresult GetAvailableSpace(nscoord aY, nsRect& aResult);
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// Clear any current floaters, returning a new Y coordinate
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nscoord ClearFloaters(nscoord aY, PRUint8 aBreakType);
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// Get the raw trapezoid count for this band.
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PRInt32 GetTrapezoidCount() const {
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return mCount;
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}
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const nsBandTrapezoid* GetTrapezoid(PRInt32 aIndex) const {
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return &mTrapezoids[aIndex];
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}
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// Get the number of floaters that are impacting the current
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// band. Note that this value is relative to the current translation
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// in the space manager which means that some floaters may be hidden
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// by the translation and therefore won't be in the count.
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PRInt32 GetFloaterCount() const {
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return mLeftFloaters + mRightFloaters;
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}
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PRInt32 GetLeftFloaterCount() const {
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return mLeftFloaters;
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}
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PRInt32 GetRightFloaterCount() const {
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return mRightFloaters;
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}
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// Return the impact on the max-element-size for this band by
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// computing the maximum width and maximum height of all the
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// floaters.
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void GetMaxElementSize(nsIPresContext* aPresContext,
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nscoord* aWidthResult, nscoord* aHeightResult) const;
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// Utility method to save away the max-element-size associated with
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// a floating frame.
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static void StoreMaxElementSize(nsIPresContext* aPresContext,
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nsIFrame* aFrame,
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const nsSize& aMaxElementSize);
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// Utility method to recover a stored max-element-size value
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// associated with a floating frame.
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static void RecoverMaxElementSize(nsIPresContext* aPresContext,
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nsIFrame* aFrame,
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nsSize* aResult);
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#ifdef DEBUG
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void List();
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#endif
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protected:
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/** utility method to calculate the band data at aY.
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* nsBlockBandData methods should never call
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* mSpaceManager->GetBandData directly.
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* They should always call this method instead so data members
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* mTrapezoid, mCount, and mSize all get managed properly.
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*/
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nsresult GetBandData(nscoord aY);
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// The spacemanager we are getting space from
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nsISpaceManager* mSpaceManager;
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nscoord mSpaceManagerX, mSpaceManagerY;
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// Limit to the available space (set by Init)
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nsSize mSpace;
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// Trapezoids used during band processing
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nsBandTrapezoid mData[NS_BLOCK_BAND_DATA_TRAPS];
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// Bounding rect of available space between any left and right floaters
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nsRect mAvailSpace;
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// Number of left/right floaters in the current band. Note that this
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// number may be less than the total number of floaters present in
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// the band, if our translation in the space manager "hides" some
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// floaters.
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PRInt32 mLeftFloaters, mRightFloaters;
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void ComputeAvailSpaceRect();
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PRBool ShouldClearFrame(nsIFrame* aFrame, PRUint8 aBreakType);
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};
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#endif /* nsBlockBandData_h___ */
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