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tdeedu/kig/objects/object_imp.h

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// Copyright (C) 2002 Dominique Devriese <devriese@kde.org>
// This program is free software; you can redistribute it and/or
// modify it under the terms of the GNU General Public License
// as published by the Free Software Foundation; either version 2
// of the License, or (at your option) any later version.
// This program 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 General Public License for more details.
// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software
// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
// 02110-1301, USA.
#ifndef KIG_OBJECTS_OBJECT_IMP_H
#define KIG_OBJECTS_OBJECT_IMP_H
#include "common.h"
class IntImp;
class DoubleImp;
class StringImp;
class InvalidImp;
class HierarchyImp;
class TransformationImp;
class TestResultImp;
class CurveImp;
class LineImp;
class PointImp;
class TextImp;
class AngleImp;
class VectorImp;
class LocusImp;
class CircleImp;
class ConicImp;
class CubicImp;
class SegmentImp;
class RayImp;
class ArcImp;
class PolygonImp;
/**
* \internal This is some OO magic commonly referred to as "double
* dispatch". If you need to do some action on an ObjectImp, and you
* need to do something different dependent on the type of o, then
* make a Visitor class that inherits this interface, and implements
* the appropriate functions properly, and call "o->visit( my_visitor
* );".
*/
class ObjectImpVisitor
{
public:
virtual ~ObjectImpVisitor();
void visit( const ObjectImp* imp );
virtual void visit( const IntImp* imp );
virtual void visit( const DoubleImp* imp );
virtual void visit( const StringImp* imp );
virtual void visit( const InvalidImp* imp );
virtual void visit( const HierarchyImp* imp );
virtual void visit( const TransformationImp* imp );
virtual void visit( const TestResultImp* imp );
virtual void visit( const LineImp* imp );
virtual void visit( const PointImp* imp );
virtual void visit( const TextImp* imp );
virtual void visit( const AngleImp* imp );
virtual void visit( const VectorImp* imp );
virtual void visit( const LocusImp* imp );
virtual void visit( const CircleImp* imp );
virtual void visit( const ConicImp* imp );
virtual void visit( const CubicImp* imp );
virtual void visit( const SegmentImp* imp );
virtual void visit( const RayImp* imp );
virtual void visit( const ArcImp* imp );
virtual void visit( const PolygonImp* imp );
};
typedef unsigned int uint;
/**
* Instances of this class represent a certain ObjectImp type. Every
* ObjectImp type has a static ObjectImpType member, that it returns a
* reference to in its type() function.. Think of it as a nice enum,
* that you can also get some data from..
*/
class ObjectImpType
{
const ObjectImpType* mtqparent;
const char* minternalname;
const char* mtranslatedname;
const char* mselectstatement;
const char* mselectnamestatement;
const char* mremoveastatement;
const char* maddastatement;
const char* mmoveastatement;
const char* mattachtothisstatement;
const char* mshowastatement;
const char* mhideastatement;
class StaticPrivate;
static StaticPrivate* sd();
public:
/**
* Returns the type with name n.
*
* \internal Do *not* call this from functions that can be called at
* static initializer time ! It depends on information that is only
* available after that stage and will crash if used too early..
*/
static const ObjectImpType* typeFromInternalName( const char* n );
/**
* \internal Construct an ObjectImpType, with a lot of data about
* your ObjectImp type.
*
* translatedname is a translatable string like "segment"
* selectstatement is a translatable string like "Select this segment"
* selectnamestatement is a translatable string like "Select segment %1"
* removeastatement is a translatable string like "Remove a Segment"
* addastatement is a translatable string like "Add a Segment"
* moveastatement is a translatable string like "Move a Segment"
* attachtothisstatement is a translatable string like "Attach to
* this segment"
* showastatement is a translatable string like "Show a Segment"
* hideastatement is a translatable string like "Hide a Segment"
*
* All translatable strings should have
* I18N_NOOP around them ! @param tqparent is the ObjectImpType of
* your tqparent ObjectImp type. Never give 0 as tqparent, except for
* the top ObjectImp ObjectImpType..
*/
ObjectImpType(
const ObjectImpType* tqparent, const char* internalname,
const char* translatedname,
const char* selectstatement,
const char* selectnamestatement,
const char* removeastatement,
const char* addastatement,
const char* moveastatement,
const char* attachtothisstatement,
const char* showastatement,
const char* hideastatement );
~ObjectImpType();
/**
* Does the ObjectImp type represented by this instance inherit the
* ObjectImp type represented by t ?
*/
bool inherits( const ObjectImpType* t ) const;
/**
* Returns an internal name for this ObjectImp type. This name is
* guaranteed unique, and mostly corresponds with the class name of
* the corresponding ObjectImp..
*/
const char* internalName() const;
/**
* The name of this type, translated to the currently used language.
*/
TQString translatedName() const;
/**
* Returns a translatable string of the form "Select this %1".
* E.g. "Select this segment". Note that users of this function
* should use i18n on the returned string before using it.
*/
const char* selectStatement() const;
/**
* Returns a translatable string of the form "Select point %1". %1
* will be filled in by whomever calls this function with the name
* of the object in question. This function should be used as
* follows: i18n( x->selectNameStatement() ).tqarg( xname ).
*/
const char* selectNameStatement() const;
/**
* Returns a translated string of the form "Remove a xxx".
* E.g. "Remove a Segment".
*/
TQString removeAStatement() const;
/**
* Returns a translated string of the form "Add a xxx".
* E.g. "Add a Segment".
*/
TQString addAStatement() const;
/**
* Returns a translated string of the form "Move a xxx".
* E.g. "Move a Segment".
*/
TQString moveAStatement() const;
/**
* Returns a translated string of the form "Attach to this xxx".
* E.g. "Attach to this segment".
* \internal This is used by the text label construction mode
*/
TQString attachToThisStatement() const;
/**
* Returns a translated string of the form "Show a xxx".
* E.g. "Show a Segment".
*/
TQString showAStatement() const;
/**
* Returns a translated string of the form "Hide a xxx".
* E.g. "Hide a Segment".
*/
TQString hideAStatement() const;
};
/**
* The ObjectImp class represents the behaviour of an object after it
* is calculated. This means how to draw() it, whether it claims to
* contain a certain point etc. It is also the class where the
* ObjectType's get their information from..
*/
class ObjectImp
{
protected:
ObjectImp();
public:
/**
* The ObjectImpType representing the base ObjectImp class. All
* other ObjectImp's inherit from this type.
*/
static const ObjectImpType* stype();
virtual ~ObjectImp();
/**
* Returns true if this ObjectImp inherits the ObjectImp type
* represented by t.
* E.g. you can check whether an ObjectImp is a LineImp by doing:
* \if creating-python-scripting-doc
* \code
* if object.inherits( LineImp.stype() ):
* \endcode
* \else
* \code
* if( object.inherits( LineImp::stype() )
* \endcode
* \endif
*/
bool inherits( const ObjectImpType* t ) const;
/**
* Returns a reference point where to attach labels; when this
* returns an invalidCoord then the attachment is either not
* done at all, or done in a specific way (like for curves,
* or for points) The treatment of points could also take
* advantage of this attachment mechanism.
*
* If this method returns a valid Coordinate, then this is
* interpreted as a pivot point for the label, which can still
* be moved relative to that point, but follows the object when
* the object changes.
* In practice a new RelativePointType is created (position of
* the string), this type in turn depends on the object (to get
* its attachPoint) and two DoubleImp that are interpreted as
* relative displacement (x and y)
*/
virtual Coordinate attachPoint( ) const = 0;
/**
* Return this ObjectImp, transformed by the transformation t.
*/
virtual ObjectImp* transform( const Transformation& t ) const = 0;
virtual void draw( KigPainter& p ) const = 0;
virtual bool tqcontains( const Coordinate& p, int width,
const KigWidget& si ) const = 0;
virtual bool inRect( const Rect& r, int width,
const KigWidget& si ) const = 0;
virtual Rect surroundingRect() const = 0;
/**
* Returns true if this is a valid ObjectImp.
* If you want to return an invalid ObjectImp, you should return an
* InvalidImp instance.
*/
bool valid() const;
virtual const uint numberOfProperties() const;
// the names of the properties as perceived by the user.. put
// I18N_NOOP's around them here..
virtual const QCStringList properties() const;
// the names of the properties as known only by kig internally. No
// need for I18N_NOOP. Preferably choose some lowercase name with
// only letters and dashes, no spaces..
virtual const QCStringList propertiesInternalNames() const;
virtual ObjectImp* property( uint which, const KigDocument& d ) const;
// Sometimes we need to know which type an imp needs to be at least
// in order to have the imp with number which. Macro's need it
// foremost. This function answers that question..
virtual const ObjectImpType* impRequirementForProperty( uint which ) const;
// Return whether the property with number which is by construction
// always a point on this curve ( if this is a curve ), or always a
// curve through this point ( if this is a curve ).
virtual bool isPropertyDefinedOnOrThroughThisImp( uint which ) const;
// What icon should be shown when talking about this property ?
virtual const char* iconForProperty( uint which ) const;
/**
* Returns the lowermost ObjectImpType that this object is an
* instantiation of.
* E.g. if you want to get a string containing the internal name of
* the type of an object, you can do:
* \if creating-python-scripting-doc
* \code
* tn = object.type().internalName()
* \endcode
* \else
* \code
* std::string typename = object.type()->internalName();
* \endcode
* \endif
*/
virtual const ObjectImpType* type() const = 0;
virtual void visit( ObjectImpVisitor* vtor ) const = 0;
/**
* Returns a copy of this ObjectImp.
* The copy is an exact copy. Changes to the copy don't affect the
* original.
*/
virtual ObjectImp* copy() const = 0;
// s is a string with at least one escape ( "%N" where N is a
// number ) somewhere. This function replaces the first escape it
// sees with the "value" of this imp ( using the TQString::arg
// functions ). This is e.g. used by TextType to turn its variable
// args into strings..
// if you implement this, then you should return true in
// canFillInEscape() ( standard implementation returns false ), and
// override fillInNextEscape() ( standard implementation does an
// assert( false ) )..
virtual bool canFillInNextEscape() const;
virtual void fillInNextEscape( TQString& s, const KigDocument& ) const;
/**
* Returns true if this ObjectImp is equal to rhs.
* This function checks whether rhs is of the same ObjectImp type,
* and whether it contains the same data as this ObjectImp.
* \internal It is used e.g. by the KigCommand stuff to see what the
* user has changed during a move..
*/
virtual bool equals( const ObjectImp& rhs ) const = 0;
/**
* \internal Return true if this imp is just a cache imp. This
* means that it will never be considered to be stored in a file or
* in an ObjectHierarchy. This is useful for objects which cannot
* (easily and usefully) be (de)serialized, like e.g.
* PythonCompiledScriptImp.. For normal objects, the default
* implementation returns false, which is fine.
*/
virtual bool isCache() const;
};
#endif