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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* mparent;
+  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 parent is the ObjectImpType of
+   * your parent ObjectImp type.  Never give 0 as parent, except for
+   * the top ObjectImp ObjectImpType..
+   */
+  ObjectImpType(
+    const ObjectImpType* parent, 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.
+   */
+  QString 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() ).arg( xname ).
+   */
+  const char* selectNameStatement() const;
+
+  /**
+   * Returns a translated string of the form "Remove a xxx".
+   * E.g. "Remove a Segment".
+   */
+  QString removeAStatement() const;
+  /**
+   * Returns a translated string of the form "Add a xxx".
+   * E.g. "Add a Segment".
+   */
+  QString addAStatement() const;
+  /**
+   * Returns a translated string of the form "Move a xxx".
+   * E.g. "Move a Segment".
+   */
+  QString 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
+   */
+  QString attachToThisStatement() const;
+
+  /**
+   * Returns a translated string of the form "Show a xxx".
+   * E.g. "Show a Segment".
+   */
+  QString showAStatement() const;
+
+  /**
+   * Returns a translated string of the form "Hide a xxx".
+   * E.g. "Hide a Segment".
+   */
+  QString 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 contains( 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 QString::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( QString& 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