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39
40#ifndef QJSENGINE_H
41#define QJSENGINE_H
42
43#include <QtCore/qmetatype.h>
44
45#include <QtCore/qvariant.h>
46#include <QtCore/qsharedpointer.h>
47#include <QtCore/qobject.h>
48#include <QtQml/qjsvalue.h>
49
50#include <QtQml/qqmldebug.h>
51
52QT_BEGIN_NAMESPACE
53
54
55template <typename T>
56inline T qjsvalue_cast(const QJSValue &);
57
58class QJSEnginePrivate;
59class Q_QML_EXPORT QJSEngine
60 : public QObject
61{
62 Q_OBJECT
63 Q_PROPERTY(QString uiLanguage READ uiLanguage WRITE setUiLanguage NOTIFY uiLanguageChanged)
64public:
65 QJSEngine();
66 explicit QJSEngine(QObject *parent);
67 ~QJSEngine() override;
68
69 QJSValue globalObject() const;
70
71 QJSValue evaluate(const QString &program, const QString &fileName = QString(), int lineNumber = 1);
72
73 QJSValue importModule(const QString &fileName);
74
75 QJSValue newObject();
76 QJSValue newArray(uint length = 0);
77
78 QJSValue newQObject(QObject *object);
79
80 QJSValue newQMetaObject(const QMetaObject* metaObject);
81
82 template <typename T>
83 QJSValue newQMetaObject()
84 {
85 return newQMetaObject(&T::staticMetaObject);
86 }
87
88 QJSValue newErrorObject(QJSValue::ErrorType errorType, const QString &message = QString());
89
90 template <typename T>
91 inline QJSValue toScriptValue(const T &value)
92 {
93 return create(type: qMetaTypeId<T>(), ptr: &value);
94 }
95 template <typename T>
96 inline T fromScriptValue(const QJSValue &value)
97 {
98 return qjsvalue_cast<T>(value);
99 }
100
101 void collectGarbage();
102
103#if QT_DEPRECATED_SINCE(5, 6)
104 QT_DEPRECATED void installTranslatorFunctions(const QJSValue &object = QJSValue());
105#endif
106
107 enum Extension {
108 TranslationExtension = 0x1,
109 ConsoleExtension = 0x2,
110 GarbageCollectionExtension = 0x4,
111 AllExtensions = 0xffffffff
112 };
113 Q_DECLARE_FLAGS(Extensions, Extension)
114
115 void installExtensions(Extensions extensions, const QJSValue &object = QJSValue());
116
117 void setInterrupted(bool interrupted);
118 bool isInterrupted() const;
119
120 QV4::ExecutionEngine *handle() const { return m_v4Engine; }
121
122 void throwError(const QString &message);
123 void throwError(QJSValue::ErrorType errorType, const QString &message = QString());
124
125 QString uiLanguage() const;
126 void setUiLanguage(const QString &language);
127
128Q_SIGNALS:
129 void uiLanguageChanged();
130
131private:
132 QJSValue create(int type, const void *ptr);
133
134 static bool convertV2(const QJSValue &value, int type, void *ptr);
135
136 friend inline bool qjsvalue_cast_helper(const QJSValue &, int, void *);
137
138protected:
139 QJSEngine(QJSEnginePrivate &dd, QObject *parent = nullptr);
140
141private:
142 QV4::ExecutionEngine *m_v4Engine;
143 Q_DISABLE_COPY(QJSEngine)
144 Q_DECLARE_PRIVATE(QJSEngine)
145};
146
147Q_DECLARE_OPERATORS_FOR_FLAGS(QJSEngine::Extensions)
148
149inline bool qjsvalue_cast_helper(const QJSValue &value, int type, void *ptr)
150{
151 return QJSEngine::convertV2(value, type, ptr);
152}
153
154template<typename T>
155T qjsvalue_cast(const QJSValue &value)
156{
157 T t;
158 const int id = qMetaTypeId<T>();
159
160 if (qjsvalue_cast_helper(value, id, &t))
161 return t;
162 else if (value.isVariant())
163 return qvariant_cast<T>(value.toVariant());
164
165 return T();
166}
167
168template <>
169inline QVariant qjsvalue_cast<QVariant>(const QJSValue &value)
170{
171 return value.toVariant();
172}
173
174Q_QML_EXPORT QJSEngine *qjsEngine(const QObject *);
175
176QT_END_NAMESPACE
177
178#endif // QJSENGINE_H
179

source code of qtdeclarative/src/qml/jsapi/qjsengine.h