Qt library is an excellent GUI library for C++ programmers developed by Nokia and now is an open source project. Often, we may use QPainter to draw strings, lines or images on a QWidget. We can override the QWidget's paintEvent() method when we want to use QPianter object to draw something on a QWidget.If we want to save the items drawn on QWidget as image for later reference, what can we do? We can save a QWidget as an image. Here is the code for achieving this:QPixmap pixmap(this->size());this->render(&pixmap);pixmap.save("test.png");Quite simple, right? Yes, these are all the code...

Recently, Nokia announced that they would lay off around 10000 employees, 700 of them are developers. Among these 700 developers, 100 are the core developers of the open source project Qt.Nokia is the main sponsor of the open source project Qt. According to Mirko Boehm, the core Qt team has around 100 people, this means that Nokia fires the whole Qt team.He criticized Nokia's decision, he thought that a responsible CEO should persuade the team to move to other platforms.Qt team is experienced, they are respectful in C++ development, there should be no problem for them to move to a new platform...

Qt framework is a popular C++GUI framework developed by Nokia. And it is also cross platform compatible. Manydevelopers are using Qt to develop C++ GUI programs. In Qt, some importantcomponents are deserved our close attention. Many developers faced the problemwhen they put some widgets in a QScrollArea widget and they want it to displayscroll bars when the widgets inside the QScrollArea overflows. After manyexperiments, I propose a way which can show scroll bars as you expected. The relationship betweenwidgets and layout is the key here. Generally, we need not to add layout toscroll area dire...