зеркало из https://github.com/mozilla/gecko-dev.git
127 строки
4.2 KiB
C++
127 строки
4.2 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
|
|
*
|
|
* The contents of this file are subject to the Netscape 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/NPL/
|
|
*
|
|
* 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 Communicator client code.
|
|
*
|
|
* The Initial Developer of the Original Code is Netscape Communications
|
|
* Corporation. Portions created by Netscape are
|
|
* Copyright (C) 1998 Netscape Communications Corporation. All
|
|
* Rights Reserved.
|
|
*
|
|
* Contributor(s):
|
|
*/
|
|
#ifndef nsBlockBandData_h___
|
|
#define nsBlockBandData_h___
|
|
|
|
#include "nsISpaceManager.h"
|
|
|
|
class nsIPresContext;
|
|
|
|
// Number of builtin nsBandTrapezoid's
|
|
#define NS_BLOCK_BAND_DATA_TRAPS 6
|
|
|
|
/**
|
|
* Class used to manage processing of the space-manager band data.
|
|
* Provides HTML/CSS specific behavior to the raw data.
|
|
*/
|
|
class nsBlockBandData : public nsBandData {
|
|
public:
|
|
nsBlockBandData();
|
|
~nsBlockBandData();
|
|
|
|
// Initialize. This must be called before any of the other methods.
|
|
nsresult Init(nsISpaceManager* aSpaceManager, const nsSize& aSpace);
|
|
|
|
// Get some available space. Note that aY is relative to the current
|
|
// space manager translation.
|
|
nsresult GetAvailableSpace(nscoord aY, nsRect& aResult);
|
|
|
|
// Clear any current floaters, returning a new Y coordinate
|
|
nscoord ClearFloaters(nscoord aY, PRUint8 aBreakType);
|
|
|
|
// Get the raw trapezoid count for this band.
|
|
PRInt32 GetTrapezoidCount() const {
|
|
return mCount;
|
|
}
|
|
|
|
const nsBandTrapezoid* GetTrapezoid(PRInt32 aIndex) const {
|
|
return &mTrapezoids[aIndex];
|
|
}
|
|
|
|
// Get the number of floaters that are impacting the current
|
|
// band. Note that this value is relative to the current translation
|
|
// in the space manager which means that some floaters may be hidden
|
|
// by the translation and therefore won't be in the count.
|
|
PRInt32 GetFloaterCount() const {
|
|
return mLeftFloaters + mRightFloaters;
|
|
}
|
|
PRInt32 GetLeftFloaterCount() const {
|
|
return mLeftFloaters;
|
|
}
|
|
PRInt32 GetRightFloaterCount() const {
|
|
return mRightFloaters;
|
|
}
|
|
|
|
// Return the impact on the max-element-size for this band by
|
|
// computing the maximum width and maximum height of all the
|
|
// floaters.
|
|
void GetMaxElementSize(nsIPresContext* aPresContext,
|
|
nscoord* aWidthResult, nscoord* aHeightResult) const;
|
|
|
|
// Utility method to save away the max-element-size associated with
|
|
// a floating frame.
|
|
static void StoreMaxElementSize(nsIPresContext* aPresContext,
|
|
nsIFrame* aFrame,
|
|
const nsSize& aMaxElementSize);
|
|
|
|
// Utility method to recover a stored max-element-size value
|
|
// associated with a floating frame.
|
|
static void RecoverMaxElementSize(nsIPresContext* aPresContext,
|
|
nsIFrame* aFrame,
|
|
nsSize* aResult);
|
|
|
|
protected:
|
|
|
|
/** utility method to calculate the band data at aY.
|
|
* nsBlockBandData methods should never call
|
|
* mSpaceManager->GetBandData directly.
|
|
* They should always call this method instead so data members
|
|
* mTrapezoid, mCount, and mSize all get managed properly.
|
|
*/
|
|
nsresult GetBandData(nscoord aY);
|
|
|
|
// The spacemanager we are getting space from
|
|
nsISpaceManager* mSpaceManager;
|
|
nscoord mSpaceManagerX, mSpaceManagerY;
|
|
|
|
// Limit to the available space (set by Init)
|
|
nsSize mSpace;
|
|
|
|
// Trapezoids used during band processing
|
|
nsBandTrapezoid mData[NS_BLOCK_BAND_DATA_TRAPS];
|
|
|
|
// Bounding rect of available space between any left and right floaters
|
|
nsRect mAvailSpace;
|
|
|
|
// Number of left/right floaters in the current band. Note that this
|
|
// number may be less than the total number of floaters present in
|
|
// the band, if our translation in the space manager "hides" some
|
|
// floaters.
|
|
PRInt32 mLeftFloaters, mRightFloaters;
|
|
|
|
void ComputeAvailSpaceRect();
|
|
PRBool ShouldClearFrame(nsIFrame* aFrame, PRUint8 aBreakType);
|
|
|
|
};
|
|
|
|
#endif /* nsBlockBandData_h___ */
|