environment.h Example File | Qt Script

- Qt 5.5
- Qt Script
- Context2D Example
- environment.h Example File
- Qt 5.5.1 Reference Documentation

# environment.h Example File

script/context2d/environment.h

    /****************************************************************************
    **
    ** Copyright (C) 2015 The Qt Company Ltd.
    ** Contact: http://www.qt.io/licensing/
    **
    ** This file is part of the examples of the Qt Toolkit.
    **
    ** $QT_BEGIN_LICENSE:BSD$
    ** You may use this file under the terms of the BSD license as follows:
    **
    ** "Redistribution and use in source and binary forms, with or without
    ** modification, are permitted provided that the following conditions are
    ** met:
    **   * Redistributions of source code must retain the above copyright
    **     notice, this list of conditions and the following disclaimer.
    **   * Redistributions in binary form must reproduce the above copyright
    **     notice, this list of conditions and the following disclaimer in
    **     the documentation and/or other materials provided with the
    **     distribution.
    **   * Neither the name of The Qt Company Ltd nor the names of its
    **     contributors may be used to endorse or promote products derived
    **     from this software without specific prior written permission.
    **
    **
    ** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
    ** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
    ** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
    ** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
    ** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
    ** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
    ** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
    ** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
    ** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
    ** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
    ** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
    **
    ** $QT_END_LICENSE$
    **
    ****************************************************************************/

    #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;

    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();

        QScriptEngine *engine() const;
        bool hasIntervalTimers() const;
        void triggerTimers();

    public slots:
        int setInterval(const QScriptValue &expression, int delay);
        void clearInterval(int timerId);

        int setTimeout(const QScriptValue &expression, int delay);
        void clearTimeout(int timerId);

    signals:
        void scriptError(const QScriptValue &error);

    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;
    };

    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);
    };

    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