• PySide 模块
  • PySide.QtScript
  • 内容表表

    上一话题

    QScriptValue

    下一话题

    QScriptExtensionInterface

    QScriptable

    概要

    函数

    详细描述

    PySide.QtScript.QScriptable class provides access to the Qt Script environment from Qt C++ member functions.

    With QScriptEngine.newQObject() , you can expose the signals and slots and properties of any PySide.QtCore.QObject (or subclass) to script code. PySide.QtScript.QScriptable augments this functionality by giving your C++ members access to the Qt Script environment they are invoked in; conceptually, it is similar to QObject.sender() .

    By subclassing PySide.QtScript.QScriptable , you get the following functions in your class: PySide.QtScript.QScriptable.thisObject() , PySide.QtScript.QScriptable.argumentCount() , PySide.QtScript.QScriptable.argument() , PySide.QtScript.QScriptable.context() and PySide.QtScript.QScriptable.engine() . With these functions, you have full access to the Qt Script environment from the slots and property access functions of your class, when they are invoked from script code.

    For example, you can throw a Qt Script exception from a slot; manipulate the this' object associated with the function call; inspect the arguments stored in the :class:`PySide.QtScript.QScriptContext to know the “real” arguments passed to the function from script code; and call script functions from your slot.

    A typical use case of PySide.QtScript.QScriptable is to implement prototype objects for custom C++ types. You define the scriptable interface of your custom type in a PySide.QtScript.QScriptable subclass using properties and slots; then you wrap an instance of your class using QScriptEngine.newQObject() , and finally pass the result to QScriptEngine.setDefaultPrototype() 。见 Default Prototypes Example to see how this can be done.

    The following is what subclassing PySide.QtScript.QScriptable typically looks like:

    class MyScriptableObject(QObject, QScriptable):
    ...
        def doSomething(self):
            ...
        def doSomethingElse(self):
            ...
    									

    The only difference from regular PySide.QtCore.QObject subclassing is that you also inherit from PySide.QtScript.QScriptable .

    In the implementation of your slots, you can then use the functions inherited from PySide.QtScript.QScriptable :

    def doSomething(self):
        self.context().throwError('Threw an error from a slot')
    def doSomethingElse(self):
        return self.thisObject()
    										

    另请参阅

    Default Prototypes Example QScriptEngine.newFunction()

    class PySide.QtScript. QScriptable
    PySide.QtScript.QScriptable. argument ( index )
    参数: index PySide.QtCore.int
    返回类型: PySide.QtScript.QScriptValue

    Returns the function argument at the given index , or an invalid PySide.QtScript.QScriptValue if the Qt function was not invoked from script code.

    PySide.QtScript.QScriptable. argumentCount ( )
    返回类型: PySide.QtCore.int

    Returns the number of arguments passed to the function in this invocation, or -1 if the Qt function was not invoked from script code.

    PySide.QtScript.QScriptable. context ( )
    返回类型: PySide.QtScript.QScriptContext

    返回指针指向 PySide.QtScript.QScriptContext associated with the current Qt function call, or 0 if the Qt function was not invoked from script code.

    PySide.QtScript.QScriptable. engine ( )
    返回类型: PySide.QtScript.QScriptEngine

    返回指针指向 PySide.QtScript.QScriptEngine associated with the current Qt function call, or 0 if the Qt function was not invoked from script code.

    PySide.QtScript.QScriptable. thisObject ( )
    返回类型: PySide.QtScript.QScriptValue

    返回 this' object associated with the current Qt function call, or an invalid :class:`PySide.QtScript.QScriptValue if the Qt function was not invoked from script code.