Nice course, helps to dive into the Qt and write a simple common programs. .. But, even without that this is a good introduction to Qt GUI in c++, exactly what I. This tutorial will explain in detail how to take your first steps in programming with Qt using the Qt Creator integrated development environment. Remark: This tutorial series target mainly Qt4. Even if most of these tutorials Qt Creator is yet another IDE for C++, but it is very well suited for Introduction to Qt · Installing Qt SDK · How a Qt program is · Qt class hierarchy.
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QObject is the most basic class in Qt.
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Most of classes in Qt inherit from this class. QObject provides some very powerful capabilities like: All widgets inherit from QObject.
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The most basic widget is the QWidget. QWidget contains most properties that are used to describe a window, or a widget, like position and size, mouse cursor, tooltips, etc. In the previous section, we displayed qt tutorial c button that is a widget, but it appears directly as a window.
There is no need for a "QWindow" class. Nearly all graphical elements inherit from QWidget. Qt tutorial c can list for example: Shared properties like size and cursors can be used on other graphical components, and QAbstractButton provides basic properties that are shared by all buttons.
Parenting system Parenting system is a convenient way of dealing with objects in Qt, especially widgets.
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Any object that inherits from QObject can have a parent and children. This hierarchy tree makes many things convenient: When an object is destroyed, all of its children are destroyed as well.
So, calling delete becomes optional in certain cases. All QObjects have findChild and findChildren methods that can be used to search for children of a given object. Child widgets in a QWidget automatically appear inside the parent widget. Since button2 has button1 qt tutorial c a parent, it is deleted also.
You can even test this in Qt Creator in the qt tutorial c section, by searching for a memory leak — there won't be any. There is clearly no benefit in putting a button inside a button, but based on this idea, we might want to put buttons inside a container, that does not display anything.
This container is simply the QWidget. The following code is used to display qt tutorial c button inside a widget: This method has the following signature: This was not a problem for our simple examples, but for more and more complex applications we might want to split our code into different classes.
What is often done is to create a class that is used to display a qt tutorial c, and implement all the widgets that are contained in this window as attributes of this class. Notice that there are some new elements in the header: A new category of methods: Implementing the window is done in the constructor.