xizhizhu.blogspot.com

Xizhi's Blog: 2010

http://xizhizhu.blogspot.com/2010

Keep logging what I am interested in. The Beauty of Qt 3: Implicit Sharing. To maximize resource usage and minimize copying, Qt uses implicit data sharing. In many classes, so that the data is copied only when. A function writes to it. This trick is also referred to as flyweight pattern. Now let's take QByteArray. As an example to see how it's implemented. It uses a private struct of Data. To track the shared data:. QBasicAtomicInt ref; / reference count, the operation on it is atomic. D = other.d;.

Xizhi's Blog: 2010-11

http://xizhizhu.blogspot.com/2010/11

Keep logging what I am interested in. The Beauty of Qt 1: D-Pointer / Private Implementation. I believe many of you who just start reading the source code. Of Qt will have the question: why Qt uses those private classes? What's the benefit of such a design pattern? Well, the most significant reason is to keep the binary compatibility. Then what is binary compatibility? From KDE TechBase defines it like this:. With this definition in mind, the benefit. Obviously, the private member of myVar. Inline Class#...

Xizhi's Blog: The Beauty of Qt 2: Meta Object

http://xizhizhu.blogspot.com/2010/12/beauty-of-qt-2-meta-object.html

Keep logging what I am interested in. The Beauty of Qt 2: Meta Object. Another interesting thing in Qt is the Q OBJECT. Macro It provides the access to meta objects, which enables you to enjoy more features of a QObject. Eg signals and slots. The meta object. Provides information about class name, properties and methods of a QObject, which is also known as reflection. You can print the information of the class name, etc.:. Const QMetaObject *metaObj = obj.metaObject();. QDebug() "methods: ";. The followi...

Xizhi's Blog: The Beauty of Qt 3: Implicit Sharing

http://xizhizhu.blogspot.com/2010/12/beauty-of-qt-3-implicit-sharing.html

Keep logging what I am interested in. The Beauty of Qt 3: Implicit Sharing. To maximize resource usage and minimize copying, Qt uses implicit data sharing. In many classes, so that the data is copied only when. A function writes to it. This trick is also referred to as flyweight pattern. Now let's take QByteArray. As an example to see how it's implemented. It uses a private struct of Data. To track the shared data:. QBasicAtomicInt ref; / reference count, the operation on it is atomic. D = other.d;.

Xizhi's Blog: Hybrid application using QML and Qt C++

http://xizhizhu.blogspot.com/2010/10/hybrid-application-using-qml-and-qt-c.html

Keep logging what I am interested in. Hybrid application using QML and Qt C. Moved to http:/ www.zionsoft.net/2010/10/hybrid-application-qml-qt/. Provides a nice way to design user interfaces, and JavaScript is employed there to implement the application logic and works pretty nice in many cases, we might still need Qt C in some situations (well, at least JavaScript has limited access outside its sandbox). 1) integrate QML into Qt C. Suppose we have a QML file, named "myqml.qml", like this:. 2) exposing ...