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/*
This file is part of the KDE libraries
Copyright (C) 1999 Lars Knoll (knoll@kde.org)
Copyright (C) 2006, 2008 Apple Inc. All rights reserved.
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public
License as published by the Free Software Foundation; either
version 2 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Library General Public License for more details.
You should have received a copy of the GNU Library General Public License
along with this library; see the file COPYING.LIB. If not, write to
the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
Boston, MA 02110-1301, USA.
This widget holds some useful definitions needed for layouting Elements
*/
#ifndef HTML_LAYOUT_H
#define HTML_LAYOUT_H
#include <QVector>
#include <math.h>
#include <assert.h>
/*
* this namespace contains definitions for various types needed for
* layouting.
*/
namespace khtml
{
const int UNDEFINED = -1;
const int PERCENT_SCALE_FACTOR = 128;
// alignment
enum VAlign { VNone=0, Bottom, VCenter, Top, Baseline };
enum HAlign { HDefault, Left, HCenter, Right, HNone = 0 };
/*
* %multiLength and %Length
*/
enum LengthType { Auto = 0, Relative, Percent, Fixed, Static };
struct Length
{
Length() : m_value(0) {}
Length(LengthType t): m_value(t) {}
Length(int v, LengthType t, bool q=false)
: m_value((v * 16) | (q << 3) | t) { assert(t != Percent); }
Length(double v, LengthType t, bool q = false)
: m_value(static_cast<int>(v * PERCENT_SCALE_FACTOR) * 16 | (q << 3) | t) { assert(t == Percent); }
bool operator==(const Length& o) const { return m_value == o.m_value; }
bool operator!=(const Length& o) const { return m_value != o.m_value; }
int value() const {
assert(type() != Percent);
return rawValue();
}
int rawValue() const { return (m_value & ~0xF) / 16; }
double percent() const
{
assert(type() == Percent);
return static_cast<double>(rawValue()) / PERCENT_SCALE_FACTOR;
}
LengthType type() const { return static_cast<LengthType>(m_value & 7); }
void setValue(LengthType t, int value)
{
assert(t != Percent);
setRawValue(t, value);
}
void setRawValue(LengthType t, int value) { m_value = value * 16 | (m_value & 0x8) | t; }
void setValue(int value)
{
assert(!value || type() != Percent);
setRawValue(value);
}
void setRawValue(int value) { m_value = value * 16 | (m_value & 0xF); }
void setValue(LengthType t, double value)
{
assert(t == Percent);
m_value = static_cast<int>(value * PERCENT_SCALE_FACTOR) * 16 | (m_value & 0x8) | t;
}
void setValue(double value)
{
assert(type() == Percent);
m_value = static_cast<int>(value * PERCENT_SCALE_FACTOR) * 16 | (m_value & 0xF);
}
/*
* works only for certain types, returns UNDEFINED otherwise
*/
int width(int maxValue) const
{
switch(type())
{
case Fixed:
return value();
case Percent:
return maxValue * rawValue() / (100 * PERCENT_SCALE_FACTOR);
case Auto:
return maxValue;
default:
return UNDEFINED;
}
}
/*
* returns the minimum width value which could work...
*/
int minWidth(int maxValue) const
{
switch(type())
{
case Fixed:
return value();
case Percent:
return maxValue * rawValue() / (100 * PERCENT_SCALE_FACTOR);
case Auto:
default:
return 0;
}
}
int minWidthRounded(int maxValue) const
{
switch(type())
{
case Fixed:
return value();
case Percent:
return static_cast<int>(round(maxValue * percent() / 100.0));
case Auto:
default:
return 0;
}
}
bool isUndefined() const { return rawValue() == UNDEFINED; }
bool isZero() const { return !(m_value & ~0xF); }
bool isPositive() const { return rawValue() > 0; }
bool isNegative() const { return rawValue() < 0; }
bool isAuto() const { return type() == Auto; }
bool isRelative() const { return type() == Relative; }
bool isPercent() const { return type() == Percent; }
bool isFixed() const { return type() == Fixed; }
bool isQuirk() const { return (m_value >> 3) & 1; }
private:
int m_value;
};
}
#endif
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