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# qcontext2dcanvas.cpp Example File
script/context2d/qcontext2dcanvas.cpp

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     **
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     #include "qcontext2dcanvas.h"

     #include "context2d.h"
     #include "domimage.h"

     #include <QApplication>
     #include <QPainter>
     #include <QPaintEvent>
     #include <QMouseEvent>
     #include <QDateTime>

     struct FakeDomEvent
     {
         enum KeyCodes  {
             DOM_VK_UNDEFINED            = 0x0,
             DOM_VK_RIGHT_ALT            = 0x12,
             DOM_VK_LEFT_ALT             = 0x12,
             DOM_VK_LEFT_CONTROL         = 0x11,
             DOM_VK_RIGHT_CONTROL        = 0x11,
             DOM_VK_LEFT_SHIFT           = 0x10,
             DOM_VK_RIGHT_SHIFT          = 0x10,
             DOM_VK_META                 = 0x9D,
             DOM_VK_BACK_SPACE           = 0x08,
             DOM_VK_CAPS_LOCK            = 0x14,
             DOM_VK_DELETE               = 0x7F,
             DOM_VK_END                  = 0x23,
             DOM_VK_ENTER                = 0x0D,
             DOM_VK_ESCAPE               = 0x1B,
             DOM_VK_HOME                 = 0x24,
             DOM_VK_NUM_LOCK             = 0x90,
             DOM_VK_PAUSE                = 0x13,
             DOM_VK_PRINTSCREEN          = 0x9A,
             DOM_VK_SCROLL_LOCK          = 0x91,
             DOM_VK_SPACE                = 0x20,
             DOM_VK_TAB                  = 0x09,
             DOM_VK_LEFT                 = 0x25,
             DOM_VK_RIGHT                = 0x27,
             DOM_VK_UP                   = 0x26,
             DOM_VK_DOWN                 = 0x28,
             DOM_VK_PAGE_DOWN            = 0x22,
             DOM_VK_PAGE_UP              = 0x21,
             DOM_VK_F1                   = 0x70,
             DOM_VK_F2                   = 0x71,
             DOM_VK_F3                   = 0x72,
             DOM_VK_F4                   = 0x73,
             DOM_VK_F5                   = 0x74,
             DOM_VK_F6                   = 0x75,
             DOM_VK_F7                   = 0x76,
             DOM_VK_F8                   = 0x77,
             DOM_VK_F9                   = 0x78,
             DOM_VK_F10                  = 0x79,
             DOM_VK_F11                  = 0x7A,
             DOM_VK_F12                  = 0x7B,
             DOM_VK_F13                  = 0xF000,
             DOM_VK_F14                  = 0xF001,
             DOM_VK_F15                  = 0xF002,
             DOM_VK_F16                  = 0xF003,
             DOM_VK_F17                  = 0xF004,
             DOM_VK_F18                  = 0xF005,
             DOM_VK_F19                  = 0xF006,
             DOM_VK_F20                  = 0xF007,
             DOM_VK_F21                  = 0xF008,
             DOM_VK_F22                  = 0xF009,
             DOM_VK_F23                  = 0xF00A,
             DOM_VK_F24                  = 0xF00B
         };

         FakeDomEvent();
         FakeDomEvent(QMouseEvent *e, QScriptEngine *eng);
         FakeDomEvent(QKeyEvent *e, QScriptEngine *eng);

         void setupModifiers(QInputEvent *e, QScriptEngine *eng);

         static int qtToDomKey(int keyCode);
         static void setupDefaults(QScriptEngine *e);
         static void setup(QScriptEngine *e);

         static QScriptValue m_proto;
     };

     Q_DECLARE_METATYPE(FakeDomEvent)

     FakeDomEvent::FakeDomEvent()
     {
     }

     FakeDomEvent::FakeDomEvent(QMouseEvent *e, QScriptEngine *eng)
     {
         setupDefaults(eng);
         setupModifiers(e, eng);
         m_proto.setProperty("type",
                             QScriptValue(eng, QLatin1String("mouseevent")));
         int button = 0;
         if (e->button() == Qt::RightButton)
             button = 2;
         else if (e->button() == Qt::MidButton)
             button = 1;
         m_proto.setProperty("button", QScriptValue(eng, button));

         m_proto.setProperty("clientX", QScriptValue(eng, e->x()));
         m_proto.setProperty("clientY", QScriptValue(eng, e->y()));
         m_proto.setProperty("layerX", QScriptValue(eng, e->x()));
         m_proto.setProperty("layerY", QScriptValue(eng, e->y()));
         m_proto.setProperty("pageX", QScriptValue(eng, e->x()));
         m_proto.setProperty("pageY", QScriptValue(eng, e->y()));
         m_proto.setProperty("screenX", QScriptValue(eng, e->globalX()));
         m_proto.setProperty("screenY", QScriptValue(eng, e->globalY()));

         eng->setDefaultPrototype(qMetaTypeId<FakeDomEvent>(), m_proto);
     }

     FakeDomEvent::FakeDomEvent(QKeyEvent *e, QScriptEngine *eng)
     {
         setupDefaults(eng);
         setupModifiers(e, eng);
         m_proto.setProperty("type", QScriptValue(eng, QLatin1String("keyevent")));

         m_proto.setProperty("isChar", QScriptValue(eng, !e->text().isEmpty()));
         m_proto.setProperty("charCode", QScriptValue(eng, e->text()));
         m_proto.setProperty("keyCode", QScriptValue(eng, qtToDomKey(e->key())));
         m_proto.setProperty("which", QScriptValue(eng, e->key()));

         eng->setDefaultPrototype(qMetaTypeId<FakeDomEvent>(), m_proto);
     }

     void FakeDomEvent::setupModifiers(QInputEvent *e, QScriptEngine *eng)
     {
         if (e->modifiers() & Qt::AltModifier)
             m_proto.setProperty("altKey", QScriptValue(eng, true));
         else
             m_proto.setProperty("altKey", QScriptValue(eng, false));

         if (e->modifiers() & Qt::ControlModifier)
             m_proto.setProperty("ctrlKey", QScriptValue(eng, true));
         else
             m_proto.setProperty("ctrlKey", QScriptValue(eng, false));

         if (e->modifiers() & Qt::MetaModifier)
             m_proto.setProperty("metaKey", QScriptValue(eng, true));
         else
             m_proto.setProperty("metaKey", QScriptValue(eng, false));

         if (e->modifiers() & Qt::ShiftModifier)
             m_proto.setProperty("shiftKey", QScriptValue(eng, true));
         else
             m_proto.setProperty("shiftKey", QScriptValue(eng, true));
     }

     int FakeDomEvent::qtToDomKey(int keyCode)
     {
         switch (keyCode) {
         case Qt::Key_Backspace:
             return  DOM_VK_BACK_SPACE;
         case Qt::Key_Enter:
             return  DOM_VK_ENTER;
         case Qt::Key_Return:
             return  DOM_VK_ENTER;
         case Qt::Key_NumLock:
             return  DOM_VK_NUM_LOCK;
         case Qt::Key_Alt:
             return  DOM_VK_RIGHT_ALT;
         case Qt::Key_Control:
             return  DOM_VK_LEFT_CONTROL;
         case Qt::Key_Shift:
             return  DOM_VK_LEFT_SHIFT;
         case Qt::Key_Meta:
             return  DOM_VK_META;
         case Qt::Key_CapsLock:
             return  DOM_VK_CAPS_LOCK;
         case Qt::Key_Delete:
             return  DOM_VK_DELETE;
         case Qt::Key_End:
             return  DOM_VK_END;
         case Qt::Key_Escape:
             return  DOM_VK_ESCAPE;
         case Qt::Key_Home:
             return  DOM_VK_HOME;
         case Qt::Key_Pause:
             return  DOM_VK_PAUSE;
         case Qt::Key_Print:
             return  DOM_VK_PRINTSCREEN;
         case Qt::Key_ScrollLock:
             return  DOM_VK_SCROLL_LOCK;
         case Qt::Key_Left:
             return  DOM_VK_LEFT;
         case Qt::Key_Right:
             return  DOM_VK_RIGHT;
         case Qt::Key_Up:
             return  DOM_VK_UP;
         case Qt::Key_Down:
             return  DOM_VK_DOWN;
         case Qt::Key_PageDown:
             return  DOM_VK_PAGE_DOWN;
         case Qt::Key_PageUp:
             return  DOM_VK_PAGE_UP;
         case Qt::Key_F1:
             return  DOM_VK_F1;
         case Qt::Key_F2:
             return  DOM_VK_F2;
         case Qt::Key_F3:
             return  DOM_VK_F3;
         case Qt::Key_F4:
             return  DOM_VK_F4;
         case Qt::Key_F5:
             return  DOM_VK_F5;
         case Qt::Key_F6:
             return  DOM_VK_F6;
         case Qt::Key_F7:
             return  DOM_VK_F7;
         case Qt::Key_F8:
             return  DOM_VK_F8;
         case Qt::Key_F9:
             return  DOM_VK_F9;
         case Qt::Key_F10:
             return  DOM_VK_F10;
         case Qt::Key_F11:
             return  DOM_VK_F11;
         case Qt::Key_F12:
             return  DOM_VK_F12;
         case Qt::Key_F13:
             return  DOM_VK_F13;
         case Qt::Key_F14:
             return  DOM_VK_F14;
         case Qt::Key_F15:
             return  DOM_VK_F15;
         case Qt::Key_F16:
             return  DOM_VK_F16;
         case Qt::Key_F17:
             return  DOM_VK_F17;
         case Qt::Key_F18:
             return  DOM_VK_F18;
         case Qt::Key_F19:
             return  DOM_VK_F19;
         case Qt::Key_F20:
             return  DOM_VK_F20;
         case Qt::Key_F21:
             return  DOM_VK_F21;
         case Qt::Key_F22:
             return  DOM_VK_F22;
         case Qt::Key_F23:
             return  DOM_VK_F23;
         case Qt::Key_F24:
             return  DOM_VK_F24;
         }
         return keyCode;
     }

     void FakeDomEvent::setupDefaults(QScriptEngine *e)
     {
         m_proto.setProperty("timeStamp", QScriptValue(e, QDateTime::currentDateTime().toTime_t()));
         m_proto.setProperty("button", QScriptValue(e, 0));
         m_proto.setProperty("charCode", QScriptValue(e, 0));
         m_proto.setProperty("clientX", QScriptValue(e, 0));
         m_proto.setProperty("clientY", QScriptValue(e, 0));
         m_proto.setProperty("isChar", QScriptValue(e, 0));
         m_proto.setProperty("keyCode", QScriptValue(e, 0));
         m_proto.setProperty("layerX", QScriptValue(e, 0));
         m_proto.setProperty("layerY", QScriptValue(e, 0));
         m_proto.setProperty("pageX", QScriptValue(e, 0));
         m_proto.setProperty("pageY", QScriptValue(e, 0));
         m_proto.setProperty("screenX", QScriptValue(e, 0));
         m_proto.setProperty("screenY", QScriptValue(e, 0));
         m_proto.setProperty("which ", QScriptValue(e, 0));
     }

     void FakeDomEvent::setup(QScriptEngine *e)
     {
         qRegisterMetaType<FakeDomEvent>();

         m_proto = e->newObject();

         setupDefaults(e);

         m_proto.setProperty("bubbles", QScriptValue(e, 0));
         m_proto.setProperty("cancelBubble", QScriptValue(e, 0));
         m_proto.setProperty("cancelable", QScriptValue(e, 0));
         m_proto.setProperty("currentTarget", QScriptValue(e, 0));
         m_proto.setProperty("detail", QScriptValue(e, 0));
         m_proto.setProperty("eventPhase", QScriptValue(e, 0));
         m_proto.setProperty("explicitOriginalTarget", QScriptValue(e, 0));
         m_proto.setProperty("originalTarget", QScriptValue(e, 0));
         m_proto.setProperty("relatedTarget", QScriptValue(e, 0));
         m_proto.setProperty("target", QScriptValue(e, 0));
         m_proto.setProperty("view", QScriptValue(e, 0));
     }

     QScriptValue FakeDomEvent::m_proto;

     static QScriptValue getElementById(QScriptContext *context, QScriptEngine *env)
     {
         QString el  = context->argument(0).toString();
         QList<QObject*> lst = qFindChildren<QObject*>(QCoreApplication::instance(), el);
         if (lst.isEmpty()) {
             foreach (QWidget *widget, QApplication::topLevelWidgets()) {
                 if (el == widget->objectName() ) {
                     lst << widget;
                     break;
                 } else {
                     lst = qFindChildren<QObject*>(widget, el);
                 }

                 if (lst.count())
                     break;
             }
         }

         return env->newQObject(lst[0]);
     }

     static QScriptValue setInterval(QScriptContext *context, QScriptEngine *env)
     {
         QScriptValue func = context->argument(0);
         qsreal interval  = context->argument(1).toNumber();
         QScriptValue val = env->globalObject().property("_qcontext");
         QContext2DCanvas *canvas =
             qobject_cast<QContext2DCanvas*>(val.toQObject());
         if (!canvas) {
             qWarning("Couldn't find a QContext2DCanvas!");
             return env->undefinedValue();
         }
         if (!func.isFunction()) {
             QString funcStr = func.toString();
             if (funcStr.endsWith("()")) {
                 funcStr.chop(2);
             }
             func = env->globalObject().property(funcStr);
         }
         if (!func.isFunction()) {
             qWarning("Couldn't find function %s",
                      qPrintable(context->argument(0).toString()));
             return env->undefinedValue();
         }

         canvas->setInterval(func, interval);

         return env->undefinedValue();
     }

     static QScriptValue setTimeout(QScriptContext *ctx, QScriptEngine *env)
     {
         return setInterval(ctx, env);
     }

     QContext2DCanvas::QContext2DCanvas(QWidget *parent)
         : QWidget(parent),
           m_firstRun(true)
     {
         setObjectName("tutorial");
         m_context = new Context2D(this);

         m_self = m_engine.newQObject(this);

         FakeDomEvent::setup(&m_engine);
         DomImage::setup(&m_engine);

         m_doc = m_engine.newObject();
         m_doc.setProperty("getElementById",
                         m_engine.newFunction(::getElementById,
                                                 /*argc = */ 1));

         m_engine.globalObject().setProperty("document", m_doc);

         m_engine.globalObject().setProperty(
             "setInterval",
             m_engine.newFunction(::setInterval, 2));
         m_engine.globalObject().setProperty(
             "setTimeout",
             m_engine.newFunction(::setTimeout, 2));
         m_engine.globalObject().setProperty("_qcontext", m_self);

         connect(&m_timer, SIGNAL(timeout()),
                 SLOT(update()));
     }

     QScriptEngine *QContext2DCanvas::engine()
     {
         return &m_engine;
     }

     void QContext2DCanvas::setScriptContents(const QString &txt)
     {
         m_timer.stop();
         m_intervalFunc     = QScriptValue();
         m_keyDownHandler   = QScriptValue();
         m_keyUpHandler     = QScriptValue();
         m_mouseDownHandler = QScriptValue();
         m_mouseUpHandler   = QScriptValue();
         m_mouseMoveHandler = QScriptValue();
         m_firstRun = true;
         m_script = txt;
         m_context->clear();
         update();
     }

     void QContext2DCanvas::paintEvent(QPaintEvent *e)
     {
         QPainter p(this);
         p.setClipRect(e->rect());

         QScriptValue ret;
         if (m_intervalFunc.isValid()) {
             m_context->begin();
             ret = m_intervalFunc.call(m_engine.globalObject());
         } else {
             ret = m_engine.evaluate(m_script);
         }
         if (!m_script.isEmpty() && m_engine.hasUncaughtException()) {
             int lineno = m_engine.uncaughtExceptionLineNumber();
             QString msg = ret.toString();
             qWarning("%s, at %d", qPrintable(msg), lineno);
             emit error(msg, lineno);
             m_timer.stop();
             return;
         }
         p.drawImage(0, 0, m_context->end());

         if (m_firstRun) {
             m_keyDownHandler = m_doc.property("onkeydown");
             m_keyUpHandler = m_doc.property("onkeyup");
             m_mouseDownHandler = m_doc.property("onmousedown");
             m_mouseUpHandler = m_doc.property("onmouseup");
             m_mouseMoveHandler = m_doc.property("onmousemove");
             setMouseTracking(m_mouseMoveHandler.isValid());
         }

         m_firstRun = false;
     }

     void QContext2DCanvas::mouseMoveEvent(QMouseEvent *e)
     {
         Q_UNUSED(e);
         if (m_mouseMoveHandler.isValid()) {
             FakeDomEvent event(e, &m_engine);
             QScriptValueList args;
             args << event.m_proto;
             m_mouseMoveHandler.call(m_engine.globalObject(), args);
         }
     }

     void QContext2DCanvas::mousePressEvent(QMouseEvent *e)
     {
         if (m_mouseDownHandler.isValid()) {
             FakeDomEvent event(e, &m_engine);
             QScriptValueList args;
             args << event.m_proto;
             m_mouseDownHandler.call(m_engine.globalObject(), args);
         }
     }

     void QContext2DCanvas::mouseReleaseEvent(QMouseEvent *e)
     {
         if (m_mouseUpHandler.isValid()) {
             FakeDomEvent event(e, &m_engine);
             QScriptValueList args;
             args << event.m_proto;
             m_mouseUpHandler.call(m_engine.globalObject(), args);
         }
     }

     void QContext2DCanvas::keyPressEvent(QKeyEvent *e)
     {
         if (m_keyDownHandler.isValid()) {
             FakeDomEvent event(e, &m_engine);
             QScriptValueList args;
             args << event.m_proto;
             m_keyDownHandler.call(m_engine.globalObject(), args);
         }
     }

     void QContext2DCanvas::keyReleaseEvent(QKeyEvent *e)
     {
         if (m_keyUpHandler.isValid()) {
             FakeDomEvent event(e, &m_engine);
             QScriptValueList args;
             args << event.m_proto;
             m_keyUpHandler.call(m_engine.globalObject(), args);
         }
     }

     void QContext2DCanvas::resizeEvent(QResizeEvent *e)
     {
         Q_UNUSED(e);
         m_context->setSize(e->size().width(), e->size().height());
     }

     QObject * QContext2DCanvas::getContext(const QString &str) const
     {
         if (str != QLatin1String("2d")) {
             qWarning("Passing invalid context %s", qPrintable(str));
         }

         m_context->begin();
         return m_context;
     }

     QContext2DCanvas::~QContext2DCanvas()
     {
     }

     void QContext2DCanvas::setInterval(const QScriptValue &func,
                                        qreal interval)
     {
         m_intervalFunc = func;
         m_timer.setInterval((int)interval);
         m_timer.start();
     }

     void QContext2DCanvas::resize(int w, int h)
     {
         QWidget::resize(w, h);
     }