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Chapter 4. Implementation 58

device manager

rosnode

main

ros

visualization

thread 1 thread 2

scene menu

visualization

MainWindow

XML

database

Figure 4.18.: The internal structure of the visualization node.

4.5.1. The MainWindow class

The MainWindow class is the graphical framework for other graphical classes, such as the scene

menu, visualization menu and is used here as a collective term for diﬀerent classes and functions

that do not belong to those two. Its tasks are:

• Providing a GUI framework for embedding other widgets as well as navigation services to

allow inter-switching.

• GUI widgets for database manipulation: adding, removing and changing of receivers and

transmitters.

• Other services, such as logging, saving the application settings and error handling.

Figure 4.19 shows the MainWindow class displaying the start menu.

The start menu contains several boxes with diﬀerent information. The most important box is the

main-box, which enables manually synchronization of the internal database with the database of

the device manager node. Normally, the database is synchronized on start-up, but in special cases,

such as if the device manager was manipulated and restarted or the network was disconnected due

to an error, it allows synchronizing without having to restart the node. A time stamp indicates

the time of the last synchronization. The scene database-box provides functionality to import or

export the local database of the scene menu. Similar to the "set device list"-service of the device

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RFXCOM RFXtrx433 Spezifikationen Seite 65