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/*
* This file is part of the html renderer for KDE.
*
* Copyright (C) 2000 Lars Knoll (knoll@kde.org)
* Copyright (C) 2003 Apple Computer, Inc.
*
* 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.
*
*/
#ifndef BIDI_H
#define BIDI_H
#include <tqstring.h>
#include "rendering/render_object.h"
namespace tdehtml {
class RenderArena;
class RenderBlock;
class RenderObject;
class InlineBox;
class BidiContext {
public:
BidiContext(unsigned char level, TQChar::Direction embedding, BidiContext *parent = 0, bool override = false);
~BidiContext();
void ref() const;
void deref() const;
unsigned char level;
bool override : 1;
TQChar::Direction dir : 5;
TQChar::Direction basicDir : 5;
BidiContext *parent;
// refcounting....
mutable int count;
};
struct BidiRun {
BidiRun(int _start, int _stop, RenderObject *_obj, BidiContext *context, TQChar::Direction dir)
: start( _start ), stop( _stop ), obj( _obj ), box(0), nextRun(0)
{
if(dir == TQChar::DirON) dir = context->dir;
level = context->level;
// add level of run (cases I1 & I2)
if( level % 2 ) {
if(dir == TQChar::DirL || dir == TQChar::DirAN || dir == TQChar::DirEN)
level++;
} else {
if( dir == TQChar::DirR )
level++;
else if( dir == TQChar::DirAN || dir == TQChar::DirEN)
level += 2;
}
}
void detach(RenderArena* renderArena);
// Overloaded new operator.
void* operator new(size_t sz, RenderArena* renderArena) throw();
// Overridden to prevent the normal delete from being called.
void operator delete(void* ptr, size_t sz);
private:
// The normal operator new is disallowed.
void* operator new(size_t sz) throw();
public:
int start;
int stop;
RenderObject *obj;
InlineBox* box;
// explicit + implicit levels here
uchar level;
bool compact : 1;
BidiRun* nextRun;
};
struct BidiIterator;
struct BidiState;
struct InlineMinMaxIterator
{
/* InlineMinMaxIterator is a class that will iterate over all render objects that contribute to
inline min/max width calculations. Note the following about the way it walks:
(1) Positioned content is skipped (since it does not contribute to min/max width of a block)
(2) We do not drill into the children of floats or replaced elements, since you can't break
in the middle of such an element.
(3) Inline flows (e.g., <a>, <span>, <i>) are walked twice, since each side can have
distinct borders/margin/padding that contribute to the min/max width.
*/
RenderObject* parent;
RenderObject* current;
bool endOfInline;
bool skipPositioned;
InlineMinMaxIterator(RenderObject* p, RenderObject* o, bool eOI=false, bool skipPos=true)
:parent(p), current(o), endOfInline(eOI), skipPositioned(skipPos) {}
inline RenderObject* next();
};
inline RenderObject* InlineMinMaxIterator::next()
{
RenderObject* result = 0;
bool oldEndOfInline = endOfInline;
endOfInline = false;
while (current != 0 || (current == parent))
{
//kDebug( 6040 ) << "current = " << current;
if (!oldEndOfInline &&
(current == parent ||
(!current->isFloating() && !current->isReplaced() && !current->isPositioned())))
result = current->firstChild();
if (!result) {
// We hit the end of our inline. (It was empty, e.g., <span></span>.)
if (!oldEndOfInline && current->isInlineFlow()) {
result = current;
endOfInline = true;
break;
}
while (current && current != parent) {
result = current->nextSibling();
if (result) break;
current = current->parent();
if (current && current != parent && current->isInlineFlow()) {
result = current;
endOfInline = true;
break;
}
}
}
if (!result) break;
if ((!skipPositioned || !result->isPositioned()) && (result->isText() || result->isBR() ||
result->isFloatingOrPositioned() || result->isReplaced() || result->isGlyph() || result->isInlineFlow()))
break;
current = result;
result = 0;
}
// Update our position.
current = result;
return current;
}
}
#endif
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