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#ifndef ENVIRONMENT_H

#define ENVIRONMENT_H

#include <qobject.h>

#include <qlist.h>

#include <qhash.h>

#include <QTimerEvent>

#include <QMouseEvent>

#include <QKeyEvent>

#include <QScriptEngine>

#include <QScriptable>

class QContext2DCanvas;

//! [0]

class Environment : public QObject

{

    Q_OBJECT

    Q_PROPERTY(QScriptValue document READ document)

public:

    Environment(QObject *parent = 0);

    ~Environment();

    QScriptValue document() const;

    void addCanvas(QContext2DCanvas *canvas);

    QContext2DCanvas *canvasByName(const QString &name) const;

    QList<QContext2DCanvas*> canvases() const;

    QScriptValue evaluate(const QString &code,

                          const QString &fileName = QString());

    QScriptValue toWrapper(QObject *object);

    void handleEvent(QContext2DCanvas *canvas, QMouseEvent *e);

    void handleEvent(QContext2DCanvas *canvas, QKeyEvent *e);

    void reset();

//! [0]

    QScriptEngine *engine() const;

//! [1]

public slots:

    int setInterval(const QScriptValue &expression, int delay);

    void clearInterval(int timerId);

    int setTimeout(const QScriptValue &expression, int delay);

    void clearTimeout(int timerId);

//! [1]

//! [2]

signals:

    void scriptError(const QScriptValue &error);

//! [2]

protected:

    void timerEvent(QTimerEvent *event);

private:

    QScriptValue eventHandler(QContext2DCanvas *canvas,

                              const QString &type, QScriptValue *who);

    QScriptValue newFakeDomEvent(const QString &type,

                                 const QScriptValue &target);

    void maybeEmitScriptError();

    QScriptEngine *m_engine;

    QScriptValue m_originalGlobalObject;

    QScriptValue m_document;

    QList<QContext2DCanvas*> m_canvases;

    QHash<int, QScriptValue> m_intervalHash;

    QHash<int, QScriptValue> m_timeoutHash;

};

//! [3]

class Document : public QObject

{

    Q_OBJECT

public:

    Document(Environment *env);

    ~Document();

public slots:

    QScriptValue getElementById(const QString &id) const;

    QScriptValue getElementsByTagName(const QString &name) const;

    // EventTarget

    void addEventListener(const QString &type, const QScriptValue &listener,

                          bool useCapture);

};

//! [3]

class CanvasGradientPrototype : public QObject, public QScriptable

{

    Q_OBJECT

protected:

    CanvasGradientPrototype(QObject *parent = 0);

public:

    static void setup(QScriptEngine *engine);

public slots:

    void addColorStop(qreal offset, const QString &color);

};

#endif