Roku BrightSign Manual do Utilizador descarregar pdf (Página 5)

BrightSign Object Library

This section specifies each of the Roku Objects that are included with BrigthScript.

Event Loops

When creating anything more than a very simple script, an Event Loop will need to be created. An Event

Loop typically has this structure:

1. wait for the event

2. process the event

3. jump back to 1

Events are things like a button press, a timer that has triggered, a video that has finished playing back, etc.

By convention, Roku Object (RO) events work as follows.

• A RO of type “roMessagePort” is created. In BrightScript, by the user’s script.

• ROs that can send events are instructed to send their events to this message port. You could set up

multiple message ports, and have each event go to its own message port, but it is usually simpler

to just create one message port, and have the events all go to this one port. To instruct the RO to

send events to a specific port, use the ifSetMessagePort Interface.

• The script waits for an event. The actual function to do this is the ifMessagePort.WaitMessage(),

but if you are using BrightScript, the built-in statement WAIT makes this easy.

• If multiple event types are possible, your script should determine which event that the wait

received, then process it. The script then jumps back to the Wait.

An “Event” can be generated by any Roku Object. For example, the class “roGpioControlPort” sends

events of type “roGpioButton”. The “roGpioButton” has one interface: ifInt. ifInt allows access to an

integer. An event loop needs to be aware of the possible events it can get, and process them.

Example

print "BrightSign Button-LED Test Running"

p = CreateObject("roMessagePort")

tmr = CreateObject("roMessagePort")

gpio = CreateObject("roGpioControlPort")

gpio.SetPort(p)

sw = CreateObject("roGpioControlPort") 'switch/led control port

sw.SetPort(p)

event_loop:

msg=wait(0, p)

if type(msg)<>"roGpioButton" then event_loop

butn = msg.GetInt()

if butn > 5 then event_loop

sw.SetOutputState(butn+17,1)

print "Button Pressed: ";butn

msg = wait (500, tmr)

sw.SetOutputState(butn+17,0)

clear_events:

msg=p.GetMessage():if type(msg)<>"rotINT32" then clear_events

goto event_loop

Classes

For each class a brief description is given, a list of interfaces, and the member functions in the interfaces.

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