Qt Object Model

最新推荐文章于 2024-09-12 20:46:18 发布

lizhi_scu

最新推荐文章于 2024-09-12 20:46:18 发布

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分类专栏： c/c++ 文章标签： object qt pointers templates inheritance features

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Qt为C++提供了强大的对象模型特性，包括无缝对象通信、可查询和设计属性、事件和事件过滤器、国际化上下文字符串转换、定时器、对象树组织等。这些特性使Qt成为图形用户界面编程的理想选择。

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The standard C++ object model provides very efficient runtime support for the object paradigm. But its static nature is inflexibile in certain problem domains. Graphical user interface programming is a domain that requires both runtime efficiency and a high level of flexibility. Qt provides this, by combining the speed of C++ with the flexibility of the Qt Object Model.

Qt adds these features to C++:

a very powerful mechanism for seamless object communication called signals and slots
queryable and designable object properties
powerful events and event filters
contextual string translation for internationalization
sophisticated interval driven timers that make it possible to elegantly integrate many tasks in an event-driven GUI
hierarchical and queryable object trees that organize object ownership in a natural way
guarded pointers (QPointer) that are automatically set to 0 when the referenced object is destroyed, unlike normal C++ pointers which become dangling pointers when their objects are destroyed
a dynamic cast that works across library boundaries.

Many of these Qt features are implemented with standard C++ techniques, based on inheritance from QObject. Others, like the object communication mechanism and the dynamic property system, require the Meta-Object System provided by Qt's own Meta-Object Compiler (moc).

The meta-object system is a C++ extension that makes the language better suited to true component GUI programming. Although templates can be used to extend C++, the meta-object system provides benefits using standard C++ that cannot be achieved with templates