Updating listviews...

[Allanon]

I'm a RapaGUI beginner, and I've tried to search the forum for an aswer but nothing found

The problem I have is that I'd like to update a listview where I'm adding log entries during a long operation, the loop runs from a callback, but seems that the listview (with my added entries) is only updated when the callback returns to the main loop that listen to the events.

Any hints about making the listview update as soon as an entry has been added?

[plouf]

Have a CheckEvent() in your loop ?

Examples would help

[Allanon]

I do have WaitEvent in the main loop and in the loop called from the callback I've tried to add a CheckEvents() but without results.

This is piece of code of the official demo (from line 185):

Code: Select all

			Case "lvaddmany":
				Local c = moai.Get("listview", "entries")
				If android Then moai.Set("listview", "quiet", True)				
				For Local k = 0 To 999 Do moai.DoMethod("listview", "insert", "bottom", "Row " .. c + k .. " item " .. "1", "Row " .. c + k .. " item " .. "2", "Row " .. c + k .. " item " .. "3")	
				If android Then moai.Set("listview", "quiet", False)

if you change the For/Do as following you will notice that entries are displayed all togheter when finished:

Code: Select all

			For Local k = 0 To 999 Do Wait(10, #MILLISECONDS) moai.DoMethod("listview", "insert", "bottom", "Row " .. c + k .. " item " .. "1", "Row " .. c + k .. " item " .. "2", "Row " .. c + k .. " item " .. "3")	

Hope this help

[Allanon]

I forgot to say that I'm on Linux

[Allanon]

After digging a bit I've tried to use the "redraw" mothod without results...

Here is a test code so you can test a simple real case:

Code: Select all

@REQUIRE "RapaGUI"

Function testFunc()

  For i=1 To 100
    moai.DoMethod("lv", "insert", "bottom", GetTime(True) .. ": " .. "Hello!")
    moai.DoMethod("lv", "jump", "bottom")
    moai.DoMethod("lv", "redraw")
    Wait(20, #MILLISECONDS)
    DebugPrint("Added item " .. i)
  Next

EndFunction

Function msgHandler(msg)
	Switch msg.action
    ; Parse RapaGUI events
    Case "RapaGUI"
      
      ; Filter actions by attributes
      Switch msg.attribute

        ; Check button presses
        Case "Pressed"
          ; Check buttons
          Switch msg.id
            Case "go"
              testFunc()

          EndSwitch
      EndSwitch
  EndSwitch

EndFunction

moai.CreateApp([[<?xml version="1.0" encoding="iso-8859-1"?>
<application id="app">
	<menubar id="menu">

		<menu title="_File">
			<item id="mn_about">_About...</item>
			<item/>
			<item id="mn_quit">_Quit</item>
		</menu>
	</menubar>

	<window title="TEST LV" id="window" menubar="menu">
		<vgroup frame="true" frametitle="Update Test">
      <listview id="lv">
        <column/>
      </listview>
      <button id="go">GO</button>            
    </vgroup>
  </window>
</application>
]])

; listen to these events!
InstallEventHandler({
  RapaGUI     = msgHandler
  })
  
; Welcome message
moai.DoMethod("lv", "insert", "bottom", GetTime(True) .. ": " .. "Hello!")
moai.DoMethod("lv", "jump", "bottom")

; Let's go!
Repeat
  WaitEvent
  
Forever

When you push [GO] the callback function will add several lines to the Listview but they are displayed only at the end of the loop, I've added the "redraw" method to try to force a refresh but without success...
I'd like to use a listview as a log box (like in the official demo), but this behaviour does not allow me to track long loops or long operations.
Should I switch to a textview class?

[Allanon]

Nope... tested textview & texteditor without any joy... I smell I have to put long operations inside timed callbacks like in the official demo for Progress Bars :

Code: Select all

			Case "pbsimprg":
				If Not HaveObject(#INTERVAL, 1)
					p_Log("Starting progress bar...")
					prgbarc = 0					
					SetInterval(1, p_ProgressbarTimer, 100)		
					moai.Set("pbsimprg", "text", "Stop timer")								
				Else
					ClearInterval(1)
					moai.Set("pbsimprg", "text", "Simulate progress")
				EndIf	

but this overcomplicate things...

Andreas, if you're around, give it a shot!

[plouf]

When you push [GO] the callback function will add several lines to the Listview but they are displayed only at the end of the loop, I've added the "redraw" method to try to force a refresh but without success...
I'd like to use a listview as a log box (like in the official demo), but this behaviour does not allow me to track long loops or long operations.
Should I switch to a textview class?

seems a Linux issue, under windows11 i see your example WITHOUT wait, isntantly show
check video -> https://streamable.com/lqo8vu

[Allanon]

When you push [GO] the callback function will add several lines to the Listview but they are displayed only at the end of the loop, I've added the "redraw" method to try to force a refresh but without success...
I'd like to use a listview as a log box (like in the official demo), but this behaviour does not allow me to track long loops or long operations.
Should I switch to a textview class?

seems a Linux issue, under windows11 i see your example WITHOUT wait, isntantly show
check video -> https://streamable.com/lqo8vu

Thank you for trying the sample script but the point is in the line you commented out
When you have the Wait() command uncommented do you see the listview populate during the for/next loop, one line at a time, or do you see all the entries at the end?

[plouf]

Thats the point of comenting out
With commented out wait is the video

I see with or without wait filling

[Allanon]

I see, so it's seems a Linux related problem...

I've the chance to test it on Windows 10 and yes, seems a bug

thank you for your time