Obsolete Members for QObject

The following members of class QObject are obsolete. They are provided to keep old source code working. We strongly advise against using them in new code.

公有函数

静态公有成员

相关非成员

Macros

成员函数

void QObject::dumpObjectInfo()

This is an overloaded function.

Dumps information about signal connections, etc. for this object to the debug output.

参见 dumpObjectTree().

void QObject::dumpObjectTree()

This is an overloaded function.

Dumps a tree of children to the debug output.

参见 dumpObjectInfo().

[static] QString QObject::trUtf8(const char *sourceText, const char *disambiguation = Q_NULLPTR, int n = -1)

Returns a translated version of sourceText, or QString::fromUtf8(sourceText) if there is no appropriate version. It is otherwise identical to tr(sourceText, disambiguation, n).

Warning: This method is reentrant only if all translators are installed before calling this method. Installing or removing translators while performing translations is not supported. Doing so will probably result in crashes or other undesirable behavior.

Warning: For portability reasons, we recommend that you use escape sequences for specifying non-ASCII characters in string literals to trUtf8(). For example:

  label->setText(tr("F\374r \310lise"));

参见 tr(), QCoreApplication::translate(), and Internationalization with Qt.

相关非成员

T qFindChild(const QObject *obj, const QString &name = QString())

This function overloads qFindChildren().

This function is equivalent to obj->findChild<T>(name).

Note: This function was provided as a workaround for MSVC 6 which did not support member template functions. It is advised to use the other form in new code.

参见 QObject::findChild().

QList<T> qFindChildren(const QObject *obj, const QString &name = QString())

This function overloads qFindChildren().

This function is equivalent to obj->findChildren<T>(name).

Note: This function was provided as a workaround for MSVC 6 which did not support member template functions. It is advised to use the other form in new code.

参见 QObject::findChildren().

宏

Q_ENUMS(...)

This macro registers one or several enum types to the meta-object system.

For example:

  class MyClass : public QObject
  {
      Q_OBJECT

  public:
      MyClass(QObject *parent = 0);
      ~MyClass();

      enum Priority { High, Low, VeryHigh, VeryLow };
      Q_ENUM(Priority)
      void setPriority(Priority priority);
      Priority priority() const;
  };

If you want to register an enum that is declared in another class, the enum must be fully qualified with the name of the class defining it. In addition, the class defining the enum has to inherit QObject as well as declare the enum using Q_ENUMS().

In new code, you should prefer the use of the Q_ENUM() macro, which makes the type available also to the meta type system. For instance, QMetaEnum::fromType() will not work with types declared with Q_ENUMS().

参见 Qt's Property System.

Q_FLAGS(...)

This macro registers one or several flags types with the meta-object system. It is typically used in a class definition to declare that values of a given enum can be used as flags and combined using the bitwise OR operator.

Note: This macro takes care of registering individual flag values with the meta-object system, so it is unnecessary to use Q_ENUMS() in addition to this macro.

In new code, you should prefer the use of the Q_FLAG() macro, which makes the type available also to the meta type system.

参见 Qt's Property System.