Roku Developer Program

[btpoole]

I think I saw a thread related to this but can't seem to locate it.  I have (1) observerfield instance that fires twice.  The observer is tied to "itemFocused" of a markupgrid. When scrolling the grid I have a print setup in debugger and can see that with each move the "onFocusChange"  is activated. Is this common practice or a bug of sometype?  I know there is only one observer setup. I set the observerfield just after setting the content of the grid. 

[EnTerr]

Not sure what you are saying, maybe you should show minimal code example. Seems natural to me that with user moving selection/cursor with the remote - with each move the itemFocused would change and accordingly any observer of that would fire. The point is to be able to insert yourself into that if something has to be done.

[btpoole]

What I am saying is that for every one click of the remote to move the focus, it executes 2x.  For example focus starts on column 0 of grid. I press right button on remote, In debugger window the print statement appears 2x. Below is min code. Task runs in int, calls the setupcontnet, updatecontent from there. The setGridContent (not shown) loops thru and sets field values for grid. I set focus at end of updatecontent. Below code is result of debugger.

Sub init()
m.ContentTask_program = createObject("RoSGNode","ContentReader_Program")
m.ContentTask_program.ObserveField("ProgramContent", "setupcontent")
m.ContentTask_program.control = "RUN"
m.ProgramMarkupGrid.ObserveField("itemFocused", "onFocusChanged")
end sub

sub setupcontent()
m.programdata=m.ContentTask_program.ProgramContent.temp
updatecontent()
end sub

sub updatecontent()
m.ProgramMarkupGrid.content=setGridContent()
m.ProgramMarkupGrid.visible=true
m.ProgramMarkupGrid.SetFocus(true)
end sub

function onFocusChanged() as void
if m.ProgramMarkupGrid.visible=true
m.columnFocused=m.ProgramMarkupGrid.itemFocused MOD m.ProgramMarkupGrid.numColumns
  ?"PROGRAM COLUMN FOCUSED "m.columnFocused
end if
end function

DEBUGGER:

PROGRAM COLUMN FOCUSED  0
PROGRAM COLUMN FOCUSED  0
PROGRAM COLUMN FOCUSED  1
PROGRAM COLUMN FOCUSED  1
PROGRAM COLUMN FOCUSED  2
PROGRAM COLUMN FOCUSED  2
PROGRAM COLUMN FOCUSED  3
PROGRAM COLUMN FOCUSED  3


Grid starts on column 0, click right remote button moves to 1, then 2 then 3. Prints multiple times. 

[EnTerr]

Ah yes, i also vaguely remember someone observing that before (but where?)

Out of curiosity - is this still the case if you observe via a port and not a field? I.e. `observeField()` with a port - and the run a loop listening on that either in main() or a task. That would help getting an idea if this is a bug (if only one msg hits the port, it's a bug - if there are two events fired, it may or may not be)

[btpoole]

Haven't yet but will try that and see where it leads.
Thanks for the suggestion.

[belltown]

It might be worth putting a print statement in updateContent just to double-check that it is only getting called once, otherwise you'd have 2 field observers assigned. Out of curiosity, does the itemUnfocused event get called twice as well?

[btpoole]

belltown
I put print statement in the updatecontent function. It only shows up once. Also the "UN"focus also shows up twice.

DEBUGGER RESULT

IN SETSTATUS ************************************
IN GetAuthData
IN HOME
IN ENTRY INT
ENTER LOAD DATA. . .
IN REGISTRY TASK
IN SETMODE   
Registry CONTENT CREATE>>>>>>>>>>>>>>
CHANNEL LIST CONTENT CREATE>>>>>>>>>>>>>>
IN UPDATECONTENT STATUS 
IN ACTIVATIONSTATUS
in buildProgramArray 
PROGRAM GRID CONTENT CREAT>>>>>>>>>>>>>>
in setSlotContent
SLOTCONTENT>>> DONE
in setGridContent--
setGridContent DONE>>>>>>>>>>>>>>>>>>>>>>>>>>>>

PROGRAM COLUMN FOCUSED  0
PROGRAM COLUMN UN -1
UPDATACONTENT>>> DONE
PROGRAM COLUMN FOCUSED  0
PROGRAM COLUMN UN -1
PROGRAM COLUMN FOCUSED  1
PROGRAM COLUMN UN  0
PROGRAM COLUMN FOCUSED  1
PROGRAM COLUMN UN  0
PROGRAM COLUMN FOCUSED  2
PROGRAM COLUMN UN  1
PROGRAM COLUMN FOCUSED  2
PROGRAM COLUMN UN  1

[btpoole]

It seems also that I must press the remote button twice to get the code to continue. For instance, I press right arrow to scroll the gird, after the initial move if I press the right arrow or left arrow again, nothing happens, if I press a second time I get a response. Odd.

[a_kaftari]

just use unobserveField().

see this article : 

https://developer.roku.com/en-gb/docs/developer-program/core-concepts/handling-application-events.md