Context2D Example▲
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#include "environment.h"
#include "qcontext2dcanvas.h"
#include "context2d.h"
#include <QScriptValueIterator>
#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
};
static int qtToDomKey(int keyCode);
};
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;
}
Environment::Environment(QObject *parent)
: QObject(parent)
{
m_engine = new QScriptEngine(this);
m_document = m_engine->newQObject(
new Document(this), QScriptEngine::QtOwnership,
QScriptEngine::ExcludeSuperClassContents);
CanvasGradientPrototype::setup(m_engine);
m_originalGlobalObject = m_engine->globalObject();
reset();
}
Environment::~Environment()
{
}
QScriptEngine *Environment::engine() const
{
return m_engine;
}
QScriptValue Environment::document() const
{
return m_document;
}
int Environment::setTimeout(const QScriptValue &expression, int delay)
{
if (expression.isString() || expression.isFunction()) {
int timerId = startTimer(delay);
m_timeoutHash.insert(timerId, expression);
return timerId;
}
return -1;
}
void Environment::clearTimeout(int timerId)
{
killTimer(timerId);
m_timeoutHash.remove(timerId);
}
int Environment::setInterval(const QScriptValue &expression, int delay)
{
if (expression.isString() || expression.isFunction()) {
int timerId = startTimer(delay);
m_intervalHash.insert(timerId, expression);
return timerId;
}
return -1;
}
void Environment::clearInterval(int timerId)
{
killTimer(timerId);
m_intervalHash.remove(timerId);
}
void Environment::timerEvent(QTimerEvent *event)
{
int id = event->timerId();
QScriptValue expression = m_intervalHash.value(id);
if (!expression.isValid()) {
expression = m_timeoutHash.value(id);
if (expression.isValid())
killTimer(id);
}
if (expression.isString()) {
evaluate(expression.toString());
} else if (expression.isFunction()) {
expression.call();
}
maybeEmitScriptError();
}
void Environment::addCanvas(QContext2DCanvas *canvas)
{
m_canvases.append(canvas);
}
QContext2DCanvas *Environment::canvasByName(const QString &name) const
{
for (int i = 0; i < m_canvases.size(); ++i) {
QContext2DCanvas *canvas = m_canvases.at(i);
if (canvas->objectName() == name)
return canvas;
}
return 0;
}
QList<QContext2DCanvas*> Environment::canvases() const
{
return m_canvases;
}
void Environment::reset()
{
if (m_engine->isEvaluating())
m_engine->abortEvaluation();
{
QHash<int, QScriptValue>::const_iterator it;
for (it = m_intervalHash.constBegin(); it != m_intervalHash.constEnd(); ++it)
killTimer(it.key());
m_intervalHash.clear();
for (it = m_timeoutHash.constBegin(); it != m_timeoutHash.constEnd(); ++it)
killTimer(it.key());
m_timeoutHash.clear();
}
for (int i = 0; i < m_canvases.size(); ++i)
m_canvases.at(i)->reset();
QScriptValue self = m_engine->newQObject(
this, QScriptEngine::QtOwnership,
QScriptEngine::ExcludeSuperClassContents);
{
QScriptValueIterator it(m_originalGlobalObject);
while (it.hasNext()) {
it.next();
self.setProperty(it.scriptName(), it.value(), it.flags());
}
}
self.setProperty("self", self);
self.setProperty("window", self);
QScriptValue navigator = m_engine->newObject();
navigator.setProperty("appCodeName", "context2d");
navigator.setProperty("appMinorVersion", 1);
navigator.setProperty("appVersion", 1);
navigator.setProperty("browserLanguage", "en_US");
navigator.setProperty("cookieEnabled", false);
navigator.setProperty("cpuClass", "i686");
navigator.setProperty("onLine", false);
navigator.setProperty("platform", "bogus OS");
navigator.setProperty("systemLanguage", "en_US");
navigator.setProperty("userAgent", "Context2D/1.1");
navigator.setProperty("userLanguage", "en_US");
self.setProperty("navigator", navigator);
m_engine->setGlobalObject(self);
m_engine->collectGarbage();
}
QScriptValue Environment::evaluate(const QString &code, const QString &fileName)
{
return m_engine->evaluate(code, fileName);
}
bool Environment::hasIntervalTimers() const
{
return !m_intervalHash.isEmpty();
}
// This is used by the Context2D Qt Script benchmark.
void Environment::triggerTimers()
{
for (int x = 0; x < 2; ++x) {
QList<int> timerIds = x ? m_intervalHash.keys() : m_timeoutHash.keys();
for (int i = 0; i < timerIds.size(); ++i) {
QTimerEvent fakeEvent(timerIds.at(i));
timerEvent(&fakeEvent);
}
}
}
QScriptValue Environment::toWrapper(QObject *object)
{
return m_engine->newQObject(object, QScriptEngine::QtOwnership,
QScriptEngine::PreferExistingWrapperObject
| QScriptEngine::ExcludeSuperClassContents);
}
void Environment::handleEvent(QContext2DCanvas *canvas, QMouseEvent *e)
{
QString type;
switch (e->type()) {
case QEvent::MouseButtonPress:
type = "mousedown"; break;
case QEvent::MouseButtonRelease:
type = "mouseup"; break;
case QEvent::MouseMove:
type = "mousemove"; break;
default: break;
}
if (type.isEmpty())
return;
QScriptValue handlerObject;
QScriptValue handler = eventHandler(canvas, type, &handlerObject);
if (!handler.isFunction())
return;
QScriptValue scriptEvent = newFakeDomEvent(type, toWrapper(canvas));
// MouseEvent
scriptEvent.setProperty("screenX", e->globalX(), QScriptValue::ReadOnly);
scriptEvent.setProperty("screenY", e->globalY(), QScriptValue::ReadOnly);
scriptEvent.setProperty("clientX", e->x(), QScriptValue::ReadOnly);
scriptEvent.setProperty("clientY", e->y(), QScriptValue::ReadOnly);
scriptEvent.setProperty("layerX", e->x(), QScriptValue::ReadOnly);
scriptEvent.setProperty("layerY", e->y(), QScriptValue::ReadOnly);
scriptEvent.setProperty("pageX", e->x(), QScriptValue::ReadOnly);
scriptEvent.setProperty("pageY", e->y(), QScriptValue::ReadOnly);
scriptEvent.setProperty("altKey", (e->modifiers() & Qt::AltModifier) != 0,
QScriptValue::ReadOnly);
scriptEvent.setProperty("ctrlKey", (e->modifiers() & Qt::ControlModifier) != 0,
QScriptValue::ReadOnly);
scriptEvent.setProperty("metaKey", (e->modifiers() & Qt::MetaModifier) != 0,
QScriptValue::ReadOnly);
scriptEvent.setProperty("shiftKey", (e->modifiers() & Qt::ShiftModifier) != 0,
QScriptValue::ReadOnly);
int button = 0;
if (e->button() == Qt::RightButton)
button = 2;
else if (e->button() == Qt::MidButton)
button = 1;
scriptEvent.setProperty("button", button);
scriptEvent.setProperty("relatedTarget", m_engine->nullValue(),
QScriptValue::ReadOnly);
handler.call(handlerObject, QScriptValueList() << scriptEvent);
maybeEmitScriptError();
}
void Environment::handleEvent(QContext2DCanvas *canvas, QKeyEvent *e)
{
QString type;
switch (e->type()) {
case QEvent::KeyPress:
type = "keydown"; break;
case QEvent::KeyRelease:
type = "keyup"; break;
default: break;
}
if (type.isEmpty())
return;
QScriptValue handlerObject;
QScriptValue handler = eventHandler(canvas, type, &handlerObject);
if (!handler.isFunction())
return;
QScriptValue scriptEvent = newFakeDomEvent(type, toWrapper(canvas));
// KeyEvent
scriptEvent.setProperty("isChar", !e->text().isEmpty());
scriptEvent.setProperty("charCode", e->text());
scriptEvent.setProperty("keyCode", FakeDomEvent::qtToDomKey(e->key()));
scriptEvent.setProperty("which", e->key());
handler.call(handlerObject, QScriptValueList() << scriptEvent);
maybeEmitScriptError();
}
QScriptValue Environment::eventHandler(QContext2DCanvas *canvas, const QString &type,
QScriptValue *who)
{
QString handlerName = "on" + type;
QScriptValue obj = toWrapper(canvas);
QScriptValue handler = obj.property(handlerName);
if (!handler.isValid()) {
obj = m_document;
handler = obj.property(handlerName);
}
if (who && handler.isFunction())
*who = obj;
return handler;
}
QScriptValue Environment::newFakeDomEvent(const QString &type, const QScriptValue &target)
{
QScriptValue e = m_engine->newObject();
// Event
e.setProperty("type", type, QScriptValue::ReadOnly);
e.setProperty("bubbles", true, QScriptValue::ReadOnly);
e.setProperty("cancelable", false, QScriptValue::ReadOnly);
e.setProperty("target", target, QScriptValue::ReadOnly);
e.setProperty("currentTarget", target, QScriptValue::ReadOnly);
e.setProperty("eventPhase", 3); // bubbling
e.setProperty("timeStamp", QDateTime::currentDateTime().toTime_t());
// UIEvent
e.setProperty("detail", 0, QScriptValue::ReadOnly);
e.setProperty("view", m_engine->globalObject(), QScriptValue::ReadOnly);
return e;
}
void Environment::maybeEmitScriptError()
{
if (m_engine->hasUncaughtException())
emit scriptError(m_engine->uncaughtException());
}
Document::Document(Environment *env)
: QObject(env)
{
}
Document::~Document()
{
}
QScriptValue Document::getElementById(const QString &id) const
{
Environment *env = qobject_cast<Environment*>(parent());
QContext2DCanvas *canvas = env->canvasByName(id);
if (!canvas)
return QScriptValue();
return env->toWrapper(canvas);
}
QScriptValue Document::getElementsByTagName(const QString &name) const
{
if (name != "canvas")
return QScriptValue();
Environment *env = qobject_cast<Environment*>(parent());
QList<QContext2DCanvas*> list = env->canvases();
QScriptValue result = env->engine()->newArray(list.size());
for (int i = 0; i < list.size(); ++i)
result.setProperty(i, env->toWrapper(list.at(i)));
return result;
}
void Document::addEventListener(const QString &type, const QScriptValue &listener,
bool useCapture)
{
Q_UNUSED(useCapture);
if (listener.isFunction()) {
Environment *env = qobject_cast<Environment*>(parent());
QScriptValue self = env->toWrapper(this);
self.setProperty("on" + type, listener);
}
}
QColor colorFromString(const QString &name);
CanvasGradientPrototype::CanvasGradientPrototype(QObject *parent)
: QObject(parent)
{
}
void CanvasGradientPrototype::addColorStop(qreal offset, const QString &color)
{
CanvasGradient *self = qscriptvalue_cast<CanvasGradient*>(thisObject());
if (!self || (self->value.type() == QGradient::NoGradient))
return;
self->value.setColorAt(offset, colorFromString(color));
}
void CanvasGradientPrototype::setup(QScriptEngine *engine)
{
CanvasGradientPrototype *proto = new CanvasGradientPrototype();
engine->setDefaultPrototype(qMetaTypeId<CanvasGradient>(),
engine->newQObject(proto, QScriptEngine::ScriptOwnership,
QScriptEngine::ExcludeSuperClassContents));
}