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Introduction to QWS

QWS (QT Windows System) is a window system developed by QT, and its architecture is similar to that of X Windows. QWS Server is displayed on the physical device, QWS Client implements the interface, and the two communicate with each other through socket. In many embedded systems, QT programs are basically implemented in QWS, which ensures the portability of the program.

QWSServer server

The QT program does not strictly distinguish between the server program and the client program, and notifies the-platform parameter to determine whether the program is a client or a server program. For the QWSServer function, it is mainly used as a server program to manage multi-client mouse and keyboard events, as well as overlapping rendering management of different client windows.

The main process of server initialization:

Initialize the QWSServerSocket network. When there is a client connection, a corresponding QWSClient will be created to manage the sending and receiving of client program events.

Initializes the QWSDisplay management window display.

Initializes the QWSCursor management mouse and keyboard event, which consists of two main classes, QWSMouseHandler and QWSKeyboardHandler.

QWSDiplay

QWSDiplay mainly manages client-side and server-side network event and request management. Manage some column requests for window operations through QWSCommand, manage mouse and keyboard events through QWSEvent, and so on.

QWSClient client

QWSClient belongs to the proxy object of the client in the QWS system, and the server interacts with the client through QWSClient to complete the event request interaction.

QWSWindow

QWSWindow belongs to the concept of middle tier in QT. It is like a container in the platform window management system, managing the different operations of QWidget client windows, such as the position and size of windows, whether the windows are in focus state, the management of toplevel widget, the distribution of QT events, and the overlapping management between different windows.

6. Appendix

Figure 6.1 QWS client-server interaction diagram

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