environment.h Example File | Qt Script

Qt 5.6 | Qt Script | Context2D Example | environment.h Example File

Qt 5.6.2 Reference Documentation

# environment.h Example File

script/context2d/environment.h

      /****************************************************************************
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      ** 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:
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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;

      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