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  1. Qt Public Slots
  2. Qt Public Versus Private Slots Free
  3. Public Versus Private Company

See UNISA – Summary of 2010 Posts for a list of related UNISA posts. Continued from UNISA Chatter – Design patterns in C++ Part 6: Widgets … Validation and Regular Expressions using QT.

An Introduction to Design Patterns in C with Qt 4. An introduction to design patterns in C with Qt 4 / Alan Ezust, Paul Ezust. Includes bibliographical references and index. ISBN 0-13-187905-7 (pbk.: alk. 23.4 public, protected, and private Derivation 536 Review Questions 539. Organized Robbery George Bernard Shaw once said 'Property is organized robbery.' This is true in a very positive sense in Python as well: A property in Python 'robs' the necessity to need getters and setters for attributes and to make it possible to start with public attributes instead of having everything private! Public Slot 与private Slot有什么区别？. Qt安装参考链接Qt基础部件参考学习链接.ui文件在配置好Qt+VS的环境之后，双击.ui文件即可以看到ui的编辑页面。 拖几个部件进主窗体之后： 运行VS程序就可以看到运行结果出现了编辑之后的效果.

  1. The new syntax allows to call not just a member function declared as slot in the header with public slots: (or with protected or private instead of public), but any kind of function (more on that in the next section).
  2. Thanks for the advice, but now I have another question. Even without the signals and slots, I tried to make it so that it did qDebug.
  3. Signals and Slots in Depth. The signals and slots mechanism is fundamental to Qt programming. It enables the application programmer to bind objects together without the objects knowing anything about each other. We have already connected some signals and slots together, declared our own signals and slots, implemented our own slots, and emitted.
  4. Qt is well known for its signals and slots mechanism. But how does it work? In this blog post, we will explore the internals of QObject and QMetaObject and discover how signals and slot work under the hood. In this blog article, I show portions of Qt5 code, sometimes edited for formatting and brevity.

IMPORTANT POINT:It is important to emphasize that the intent of these posts are to share my learning's as I dig through the last three subjects of my part-time UNISA studies. The posts by no means promote concepts or technologies … they are pure information sharing for fellow students … although the highlight that we explore more technologies and concepts that we typically prefer :)

Versus

Today we explore QT’s implementation of the MetaObject Pattern, which provide information about properties and methods of a QObject.

TechnologyDescription
QT MetaObject CompilerAlso known as moc, generates the code that supports the reflection feature.
QMetaObject

Supports the following functions:

  • className() returns the class name
  • superClass() returns a pointer to the QMetaObject of the base class or 0.
  • methodCount() returns the number of member functions of the class
  • … and lots more … refer to QT help :)
DestType* qobject_cast<DestType*>(*)

Using the typecast operator we can convert an expression from one type to another. The destination type (DestType) is derived from QObject, making the operator a downcast operator. See dynamic_cast in QT help for more information.

Properties versus Getters/SettersGetters and setters are faster and more efficient. QObject Properties, however, are more generic.
QVariantUnion wrapper for all the basic types and allowed Q_PROPERTY types. The struct delivers a rich interface for conversions and validations.
DataObject

An extension to the QOject, which delivers additional features:

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  • virtual interface for obtaining properties
  • copying and comparing functions
  • toString() function that returns a presentation of all the properties of the object in XML format

Here is an extract from the assignment code I wrote to explore the above:

Textbook Header File (take note of lines 10 – 15) …

This results in the following code being generated and added to the resultant program …

Qt Public Slots

Which we can analyze with a function such as …

Qt Public Versus Private Slots Free

Giving us this result …

Note that we have eight property macro methods, which are the four getters and the four setters we defined. We also have five properties … why five and not four? We have our four properties and the “name” property that is defined within QObject.

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Public Versus Private Company

If you are working in Visual Studio 2010, as I am, you may want to look at the following information which is kind-of-related:

  • Using Properties (C# Programming Guide) … http://msdn.microsoft.com/en-us/library/w86s7x04.aspx
  • Attributes (C# and Visual Basic) … http://msdn.microsoft.com/en-us/library/z0w1kczw.aspx
  • Accessing Attributes by Using Reflection (C# and Visual Basic) … http://msdn.microsoft.com/en-us/library/z919e8tw.aspx
  • Reflection (C# and Visual Basic) … http://msdn.microsoft.com/en-us/library/ms173183.aspx

Yippee, next time we will look at more design patterns and summarize all of the patterns we have encountered during our UNISA adventure this year :)