QQmlScriptString Class | QtQml 5.3

- Qt 5.3
- Qt QML
- C++ Classes
- QQmlScriptString
- Qt 5.3.2 Reference Documentation

# QQmlScriptString Class

The QQmlScriptString class encapsulates a script and its context. More...

Header: | `#include <QQmlScriptString>`
qmake: | `QT += qml`

- List of all members, including inherited members

## Public Functions

| QQmlScriptString()
| QQmlScriptString(const QQmlScriptString & other)
bool | booleanLiteral(bool * ok) const
bool | isEmpty() const
bool | isNullLiteral() const
bool | isUndefinedLiteral() const
qreal | numberLiteral(bool * ok) const
QString | stringLiteral() const
QQmlScriptString & | operator=(const QQmlScriptString & other)

## Detailed Description

The QQmlScriptString class encapsulates a script and its context.

QQmlScriptString is used to create QObject properties that accept a script "assignment" from QML.

Normally, the following QML would result in a binding being established for the `script` property; i.e. `script` would be assigned the value obtained from running `myObj.value = Math.max(myValue, 100)`

    MyType {
        script: myObj.value = Math.max(myValue, 100)
    }

If instead the property had a type of QQmlScriptString, the script itself -- myObj.value = Math.max(myValue, 100) -- would be passed to the `script` property and the class could choose how to handle it. Typically, the class will evaluate the script at some later time using a QQmlExpression.

    QQmlExpression expr(scriptString);
    expr.evaluate();

See also QQmlExpression.

## Member Function Documentation

### QQmlScriptString::QQmlScriptString()

Constructs an empty instance.

### QQmlScriptString::QQmlScriptString(const QQmlScriptString & other)

Copies other.

### bool QQmlScriptString::booleanLiteral(bool * ok) const

If the content of the QQmlScriptString is a boolean literal, returns the boolean value and sets ok to true. Otherwise returns false and sets ok to false.

### bool QQmlScriptString::isEmpty() const

Returns whether the QQmlScriptString is empty.

### bool QQmlScriptString::isNullLiteral() const

Returns whether the content of the QQmlScriptString is the `null` literal.

### bool QQmlScriptString::isUndefinedLiteral() const

Returns whether the content of the QQmlScriptString is the `undefined` literal.

### qreal QQmlScriptString::numberLiteral(bool * ok) const

If the content of the QQmlScriptString is a number literal, returns that number and sets ok to true. Otherwise returns 0.0 and sets ok to false.

### QString QQmlScriptString::stringLiteral() const

If the content of the QQmlScriptString is a string literal, returns that string. Otherwise returns a null QString.

### QQmlScriptString & QQmlScriptString::operator=(const QQmlScriptString & other)

Assigns other to this.