I need help writing a component that works with livebinding.

[kabiri 3]

I have created a component for FMX. This component has an internal list. I want to fill this list with database values. (Using the livebinding method.)

I have derived my component from (TPresentedControl, IItemsContainer).

If I derive my component from stringgrid, everything works, but I don't want to do that. (My component is not similar to stringgrid.)

I'm not sure, but I think I can do this with observer. But I don't know how.

If you have a solution for this, I would appreciate your guidance.

 

 

[Serge_G 85]

have a look at http://docwiki.embarcadero.com/RADStudio/Seattle/en/Tutorial:_Creating_LiveBindings-Enabled_Components
 

in short, you need to declare these procedures and function in your component code

    procedure ObserverToggle(const AObserver: IObserver; const Value: Boolean);
  protected
    function CanObserve(const ID: Integer): Boolean; override;                  
    procedure ObserverAdded(const ID: Integer; const Observer: IObserver); override; 

and do some register observable members
 

If you read French, I wrote some tutorials (part I, part II)

[kabiri 3]

1 hour ago, Serge_G said:

have a look at http://docwiki.embarcadero.com/RADStudio/Seattle/en/Tutorial:_Creating_LiveBindings-Enabled_Components
 

in short, you need to declare these procedures and function in your component code

    procedure ObserverToggle(const AObserver: IObserver; const Value: Boolean);
  protected
    function CanObserve(const ID: Integer): Boolean; override;                  
    procedure ObserverAdded(const ID: Integer; const Observer: IObserver); override; 

and do some register observable members
  

If you read French, I wrote some tutorials (part I, part II)

Thank you for your response. Yes, I have seen it. It just sets a property to receive information from livebinding. In the photo I sent, I do not want the position property to be added. I want the * option to be added.
 

This photo :
https://docwiki.embarcadero.com/images/RADStudio/Seattle/e/1/13/LBTTrackBar3.png

[Serge_G 85]

Ah, the "synch" one ! I never search for this one.

 

In my mind you need at least to declare in your code

    procedure ObserverToggle(const AObserver: IObserver; const Value: Boolean);
  protected
    function CanObserve(const ID: Integer): Boolean; override;  

Then check a unit like FMX.Listview.pas (searching 'observer') 

 
 EditLinkID,  PositionLinkID and  IteratorLinkID (from System.Classes) seems to be the keys

[kabiri 3]

1 hour ago, Serge_G said:

Ah, the "synch" one ! I never search for this one.

 

In my mind you need at least to declare in your code

 

    procedure ObserverToggle(const AObserver: IObserver; const Value: Boolean);
  protected
    function CanObserve(const ID: Integer): Boolean; override;  

Then check a unit like FMX.Listview.pas (searching 'observer') 

 
 EditLinkID,  PositionLinkID and  IteratorLinkID (from System.Classes) seems to be the keys

Thank you
I'll check it.