RFXCOM RFXtrx433 Especificaciones descargar pdf (Pagina 67)

Chapter 4. Implementation 60

Figure 4.20.: The receiver dialog on the left and the transmitter dialog on the right.

4.5.2. Visualization Menu

The visualization menu is a class for displaying the database of the device manager to provide a

quick overview of the connections between devices and their state. Devices are listed in a simple

tree model, which allows a clear and easily understandable structure and prevents overlapping

connection arrows in more complex HA systems. There are two diﬀerent viewing modes, the

transmitter and receiver view. When selecting the receiver view, the left column will contain

all receivers and the right column will display every connected transmitter for each receiver.

Transmitter view is just the opposite. As a result, the right column can contain multiple entries of

the same device. Furthermore, the visualization menu oﬀers functions for controlling devices and

for user convenience. Each entry can be selected and its information is displayed in the information

box and enable or disable actions in the action box. In order to make large databases easier to

manage, a zoom slider allows zooming in and out and a search bar with auto completion helps

ﬁnd a certain entry.

The internal structure is composed of several GUI elements, functions and the core, which is

shown in ﬁgure 4.22 on page 62. The basis of the core is the QGraphicsScene class, a container

for managing large amounts of 2D elements. During start-up or changes in the database, it is ﬁlled

with receiver and sender items, which are custom graphic classes for rendering. They contain the

name, the state and the type of a device as well as information for drawing them. Consequently,

actions such as clicking a device to display its information in the information bar, repainting them

during an update or switching them on an oﬀ, causes the visualization menu to access the database

and collect additional information. Above all, a complete redraw, for example when alternating

between sender and receiver view, will lead to a high number of database accesses. For this

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RFXCOM RFXtrx433 Especificaciones Pagina 67