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