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/*
For general Scribus (>=1.3.2) copyright and licensing information please refer
to the COPYING file provided with the program. Following this notice may exist
a copyright and/or license notice that predates the release of Scribus 1.3.2
for which a new license (GPL+exception) is in place.
*/
/* This file is part of the KDE project
Copyright (c) 2003 Lukas Tinkl <lukas@kde.org>
Copyright (c) 2003 David Faure <faure@kde.org>
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., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA.
*/
#ifndef STYLESTACK_H
#define STYLESTACK_H
#include <QDomElement>
#include <QStringList>
#include <QList>
#include <QStack>
/**
* This class implements a stack for the different styles of an object.
*
* There can be several styles that are valid for one object. For example
* a textobject on a page has styles 'pr3' and 'P7' and a paragraph in
* that textobject has styles 'P1' and 'T3'. And some styles even have
* parent-styles...
*
* If you want to know if there is, for example, the attribute 'fo:font-family'
* for this paragraph, you have to look into style 'T3', 'P1', 'P7' and 'pr3'.
* When you find this attribute in one style you have to stop processing the list
* and take the found attribute for this object.
*
* This is what this class does. You can push styles on the stack while walking
* through the xml-tree to your object and then ask the stack if any of the styles
* provides a certain attribute. The stack will search from top to bottom, i.e.
* in our example from 'T3' to 'pr3' and return the first occurrence of the wanted
* attribute.
*
* So this is some sort of inheritance where the styles on top of the stack overwrite
* the same attribute of a lower style on the stack.
*/
class StyleStack
{
public:
StyleStack();
virtual ~StyleStack();
enum Mode
{
OODraw1x = 1,
OODraw2x = 2
};
/**
* Set attribute analysis mode.
*/
void setMode( const StyleStack::Mode mode );
/**
* Clears the complete stack.
*/
void clear();
/**
* Save the current state of the stack. Any items added between
* this call and its corresponding restore() will be removed when calling restore().
*/
void save();
/**
* Restore the stack to the state it was at the corresponding save() call.
*/
void restore();
/**
* Removes the style on top of the stack.
*/
void pop();
/**
* Pushes the new style onto the stack.
*/
void push( const QDomElement& style );
/**
* Check if any of the styles on the stack has an attribute called 'name'.
*/
bool hasAttribute( const QString& name ) const;
/**
* Search for the attribute called 'name', starting on top of the stack,
* and return it.
*/
QString attribute( const QString& name ) const;
/**
* Check if any of the styles on the stack has an attribute called 'name'-'detail'
* where detail is e.g. left, right, top or bottom.
* This allows to also find 'name' alone (e.g. padding implies padding-left, padding-right etc.)
*/
bool hasAttribute( const QString& name, const QString& detail ) const;
/**
* Search for the attribute called 'name', starting on top of the stack,
* and return it.
*/
QString attribute( const QString& name, const QString& detail ) const;
/**
* Check if any of the styles on the stack has a child node called 'name'.
*/
bool hasChildNode(const QString & name) const;
/**
* Search for a child node called 'name', starting on top of the stack,
* and return it.
*/
QDomNode childNode(const QString & name) const;
/**
* Special case for the current font size, due to special handling of fo:font-size="115%".
*/
double fontSize() const;
/**
* Return the name of the style specified by the user,
* i.e. not an auto style
*/
QString userStyleName() const;
private:
// Node names to look for style properties
QStringList m_nodeNames;
// For save/restore: stack of "marks". Each mark is an index in m_stack.
QStack<int> m_marks;
// We use QValueList instead of QValueStack because we need access to all styles
// not only the top one.
QList<QDomElement> m_stack;
// Get node name to look for according to property type
void fillNodeNameList( QStringList& names, const StyleStack::Mode mode );
// Search a specific attribute amongst childs of an element
QDomElement searchAttribute( const QDomElement& element, const QStringList& names,const QString& name ) const;
// Search a specific attribute amongst childs of an element
QDomElement searchAttribute( const QDomElement& element, const QStringList& names, const QString& name, const QString& fullName ) const;
};
#endif /* STYLESTACK_H */
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