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// Copyright (C) 2008 Lukas Lalinsky
//
// 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 DATABASERELATION_H
#define DATABASERELATION_H
#include <QPair>
#include <QGraphicsItem>
#include <QPainter>
#include "line.h"
#include "databasetable.h"
#include "connector.h"
class DatabaseRelationship : public Line
{
Q_OBJECT
Q_ENUMS(Cardinality Action)
Q_PROPERTY(Cardinality cardinality READ cardinality WRITE setCardinality);
Q_PROPERTY(bool childOptional READ isChildOptional WRITE setChildOptional);
Q_PROPERTY(bool parentOptional READ isParentOptional WRITE setParentOptional);
Q_PROPERTY(Column* childColumn READ childColumn WRITE setChildColumn);
Q_PROPERTY(Column* parentColumn READ parentColumn WRITE setParentColumn);
public:
DatabaseRelationship(DiagramItem *parent = 0);
~DatabaseRelationship();
QRectF boundingRect() const;
QPainterPath shape() const;
void paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget = 0);
DatabaseTable *childTable() const { return qobject_cast<DatabaseTable *>(connector(0)->connectedObject()); }
DatabaseTable *parentTable() const { return qobject_cast<DatabaseTable *>(connector(1)->connectedObject()); }
enum { Type = DiagramItem::Relation };
virtual int type() const { return Type; }
static const char *staticTypeName() { return "database-relationship"; }
virtual const char *typeName() { return staticTypeName(); }
void loadFromXml(QDomElement element, DiagramDocument *document = 0);
void saveToXml(QDomDocument doc, QDomElement element);
//! Returns true if the foreign key on the child table is also the primary key
bool isIdentifying() const;
bool isChildOptional() const;
void setChildOptional(bool optional);
bool isParentOptional() const;
void setParentOptional(bool optional);
enum Cardinality {
OneToOne,
OneToMany,
ManyToMany,
};
//! Returns the cardinality of the relationship
Cardinality cardinality() const;
//! Sets the relationship cardinality
void setCardinality(Cardinality cardinality);
//! List of columns in the child (referencing) table
Column *childColumn() const;
void setChildColumn(Column *column);
//! List of columns in the parent (referenced) table
Column *parentColumn() const;
void setParentColumn(Column *column);
enum Action {
NoAction,
Restrict,
Cascade,
SetNull,
SetDefault
};
Action onUpdateAction() const;
Action onDeleteAction() const;
static DiagramItemProperties *createPropertiesEditor(QWidget *parent = 0);
public slots:
void updateLayout();
void updateEnds();
protected:
QVariant itemChange(GraphicsItemChange change, const QVariant &value);
private:
class PrivateData;
PrivateData *const d;
};
#endif
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