mediaplayer events export to calling class

Hi folks,

As the m3u/mp3 player test and learning app evolves, I am now at learning a little bit OOP.

My first try succeded in creating a class encapsulating most of the information we get
if playing an mp3 file.

Now I wanted to separate the GUI from the class, which also works.

However, information generated during playback, such as the current playback position,
song length, and song tags, is now only available in the class.

Now the question is: is there an easy way to return the information as an event to the calling instance?
My current approach - not yet implemented - is a timer that queries the class for the values every
xx milliseconds, stored in a collection.

E.g. the event in the class returns the actual song position, which is needed for the progressbar.

Or should I pass a variable by reference to the class and make the changes in the GUI there?
To do this, however, a clear interface would have to be created - such as for the progress bar.

Your thoughts?

Thanks a lot,
Regards
Yogi

Create a loop in your class to determine position.
Assign that position to a propery that you can read outside the class


In above example you assign the position to private variable $iCurrentPosition in your loop

Outside the class you can approach the property as follows:

When the loop runs the CurrentPosition will change with it.
That's the first I came up with, but there are multiple roads to Rome…

You use $iCurrentPosition (a Private variable) inside the class and CurrentPosition (a Public variable) outside the class.


 

if the mediaplayer is running it automatically updates the collection with the values from the
sub - mediaplayer calls at my knowledge periodically (position) and if something changes (_tag, _End)
this following events/subs I use:

and this are the ones from the description:

But thanks for your input. It helped taking a new view and possibly I don't use the Player GUI modal
but just do a .show() instead of .showmodal() and do a loop and update the GUI there with the
class values till the GUI closes.

The .showmodal() is just a fixed GUI without any problems one has to check outside.
I don't know what I have to be aware if doing just the .show() part.

Kind regards,
Yogi

Never worked with gb.media, but had a look at the wiki.
Untested what I do above, wrote it down right here.
Give it a go and let me know  if it works 


 

gbWilly said

Code (gambas)

Public MyProgress As Float Use $fMyProgress
Public MyDuration As Float Use $fMyDuration


Public Sub hPlayer_Duration()

  $fMyDuration = hPlayer.Duration

End

Public Sub hPlayer_Progress()

   $fMyProgress = hPlayer.Progress

End
 

Never worked with gb.media, but had a look at the wiki.
Untested what I do above, wrote it down right here.
Give it a go and let me know  if it works 


 

From “Post #12,659”, October 22nd 2025, 3:49 PM

Thanks Willi, the next steps in OOP …

kind regards
Yogi

The Public in above code for the properties needs to be Property!!  My mistake 

This syntax:




used to be (and still valid for backward compatibily):



So, it is a property with a read and write event as posted above, but the short form introduced somewhere in version 3 has some internal implementation.

In your case Property Read MyProgress As Float Use $fMyProgress would do as you do not need a write event.
 

Thanks for going deeper.

I did in the class:
and in the calling sub:

This works at the moment 😀
Thanks a lot,
kind regards
Yogi

Hi folks 😇

After a heavy last weekend (in short, screwed my backups 5TB USB drive AND my running system)
I'm back again.

The mp3 player story evolves. I'd like to use Tableview, it is nice to handle what to show, knows
immediatley the selections.
At the tests before doing the mp3 class all worked well. Now that I try to encapsulate all functions
into the class I get a problem.

On the form I create I have a tableview object. I prepare the view like


and then it gets updated through

Now I have a mp3 class and give a reference to the tableview object on the form to the class.

Is it somehow possible to have the "Public Sub Tableview1_data" event inside the class
through the reference? Also other automatically called events like "Public Sub Tableview1_drop" etc?

Listbox reference would be a simple solution, because just setting the array to the reference it shows
the songs in the listbox, but also the problem with event handling inside the class…

Thanks a lot,
Kind regards,
Yogi

If your class is called MyClass.class then you can deal with the events in that class by attaching the TableView object to it…


Then all events will be handled by MyClass and not the form class.


Also do your fields need to be editable?
Ie. Is there a reason to choose TableView over GridView.

When you really feel like blowing your mind check out this post…
MPRIS2 with Mediaview

If your player has MPRIS2 it can display info and be controlled by other programs like the KDE desktop media controller.

BruceSteers said

If your class is called MyClass.class then you can deal with the events in that class by attaching the TableView object to it…

Code

Public Sub Form_Open()

  Object.Attach(TableView1, MyClass, "TableView1")

End


Then all events will be handled by MyClass and not the form class.


Also do your fields need to be editable?
Ie. Is there a reason to choose TableView over GridView.

From “Post #12,752”, October 31st 2025, 4:40 AM

Dear Bruce,
Thanks for helping out, this seems to be the way I thought of - without knowing much about OOP.
I hope I understood the way where it should be positioned in the source.
Instead of using the TableView just used another "problem" which should be at the same level:

There is a mp3player form with the Sub Form_open, initializing the class.
A separate form  "mp3visuell" is used for visual effects, contains the drawing area "dwaVisualisation".

Class name is "LFmp3"
So I did Sub form_Open() for the mp3player Form:
Object.Attach(mp3visuell.dwaVisualisation, LFmp3, "dwaVisualisation")
Did a cLFmp3 = New LFmp3(mp3visuell.dwaVisualisation) 'giving the object reference to the class

In the class created a Public variable
Public dwaVisualisation As DrawingArea
it gets the value of the given argument reference to the "mp3visuell.dwaVisualisation"

and a Sub
Public Sub dwaVisualisation_Draw()

but the Sub is never called.
So the problem is in front of the screen 😇

Where is the error?
Thanks a lot
Yogi

PS: As I have not used so many "views" of the object class since I began with Gambas in September I
used first the simple Listbox, then came aware of the TableView which suits better for viewing a
String[] Array with more columns
So will have a look also at the GridView…

BruceSteers said

When you really feel like blowing your mind check out this post…
MPRIS2 with Mediaview

If your player has MPRIS2 it can display info and be controlled by other programs like the KDE desktop media controller.

From “Post #12,753”, October 31st 2025, 4:51 AM

I think this is beyond my skills …
Thanks again,
Regards
Yogi

Just for your interest, a rough framework for download and test

testmp3-0.0.1.tar.gz