gecko-dev/layout/style/nsStyleCoord.h

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C
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/* -*- 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 1.0 (the "NPL"); you may not use this file except in
* compliance with the NPL. You may obtain a copy of the NPL at
* http://www.mozilla.org/NPL/
*
* Software distributed under the NPL is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the NPL
* for the specific language governing rights and limitations under the
* NPL.
*
* The Initial Developer of this code under the NPL is Netscape
* Communications Corporation. Portions created by Netscape are
* Copyright (C) 1998 Netscape Communications Corporation. All Rights
* Reserved.
*/
#ifndef nsStyleCoord_h___
#define nsStyleCoord_h___
#include "nscore.h"
#include "nsCoord.h"
class nsString;
enum nsStyleUnit {
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eStyleUnit_Null = 0, // (no value) value is not specified
eStyleUnit_Normal = 1, // (no value)
eStyleUnit_Auto = 2, // (no value)
eStyleUnit_Inherit = 3, // (no value) value should be inherited
eStyleUnit_Percent = 10, // (float) 1.0 == 100%
eStyleUnit_Coord = 20, // (nscoord) value is twips
eStyleUnit_Integer = 30, // (int) value is simple integer
eStyleUnit_Proportional = 31, // (int) value has proportional meaning
eStyleUnit_Enumerated = 32 // (int) value has enumerated meaning
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};
class nsStyleCoord {
public:
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nsStyleCoord(nsStyleUnit aUnit = eStyleUnit_Null);
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nsStyleCoord(nscoord aValue);
nsStyleCoord(PRInt32 aValue, nsStyleUnit aUnit);
nsStyleCoord(float aValue);
nsStyleCoord(const nsStyleCoord& aCopy);
nsStyleCoord& operator=(const nsStyleCoord& aCopy);
PRBool operator==(const nsStyleCoord& aOther) const;
nsStyleUnit GetUnit(void) const { return mUnit; }
nscoord GetCoordValue(void) const;
PRInt32 GetIntValue(void) const;
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float GetPercentValue(void) const;
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void Reset(void); // sets to null
void SetCoordValue(nscoord aValue);
void SetIntValue(PRInt32 aValue, nsStyleUnit aUnit);
void SetPercentValue(float aValue);
void SetNormalValue(void);
void SetAutoValue(void);
void SetInheritValue(void);
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void AppendToString(nsString& aBuffer) const;
void ToString(nsString& aBuffer) const;
protected:
nsStyleUnit mUnit;
union {
PRInt32 mInt; // nscoord is a PRInt32 for now
float mFloat;
} mValue;
};
inline PRInt32 nsStyleCoord::GetCoordValue(void) const
{
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NS_ASSERTION((mUnit == eStyleUnit_Coord), "not a coord value");
if (mUnit == eStyleUnit_Coord) {
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return mValue.mInt;
}
return 0;
}
inline PRInt32 nsStyleCoord::GetIntValue(void) const
{
NS_ASSERTION((mUnit == eStyleUnit_Proportional) ||
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(mUnit == eStyleUnit_Enumerated) ||
(mUnit == eStyleUnit_Integer), "not an int value");
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if ((mUnit == eStyleUnit_Proportional) ||
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(mUnit == eStyleUnit_Enumerated) ||
(mUnit == eStyleUnit_Integer)) {
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return mValue.mInt;
}
return 0;
}
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inline float nsStyleCoord::GetPercentValue(void) const
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{
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NS_ASSERTION(mUnit == eStyleUnit_Percent, "not a percent value");
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if (mUnit == eStyleUnit_Percent) {
return mValue.mFloat;
}
return 0.0f;
}
#endif /* nsStyleCoord_h___ */