GLWidget.h

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//-- GLWidget.h ---------------------------------------------------------
//
// Copyright (C) 2006 Kenny Gruchalla.  All rights reserved.
//
// Abstract base class for OpenGL-based widgets that provides a common
// interface for selecting, moving, and drawing.
//
//----------------------------------------------------------------------------
 
#ifndef GLWidget_H
#define GLWidget_H
 
#include <qobject.h>
 
#include <qnamespace.h>
#include <list>
 
class QWidget;
 
class GLWidget : public QObject {
    Q_OBJECT
 
protected:
    enum { NONE = -1 };
 
public:
    GLWidget(QWidget *parent = 0);
    virtual ~GLWidget();
 
    virtual int paintGL() = 0;
 
    virtual void move(float dx, float dy = 0.0, float dz = 0.0) = 0;
    virtual void drag(float dx, float dy = 0.0, float dz = 0.0) = 0;
 
    virtual bool selected() { return _selected != NONE; }
    virtual void deselect() { _selected = NONE; }
    virtual void select(int handle, Qt::KeyboardModifiers) { _selected = handle; }
 
    virtual bool enabled() const { return _enabled; }
    virtual void enable(bool flag) { _enabled = flag; }
 
    virtual void setGeometry(float x0, float x1, float y0, float y1);
 
    int id() const { return _id; }
 
signals:
 
    void startChange(QString);
    void endChange();
 
protected:
    static unsigned int createId();
 
    unsigned int _id;
    int          _selected;
    bool         _enabled;
 
    float _minX;
    float _maxX;
    float _minY;
    float _maxY;
};
 
#endif    // GLWidget_H