Nice article - but unfortunately a bit wrong: https://www.code-partners.com/tnotifyevent-debouncing-in-delphi/

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Nice article - but unfortunately a bit wrong: https://www.code-partners.com/tnotifyevent-debouncing-in-delphi/

The title says debounce but he explains, shows and implements throttle.

There is a link that explains both:
https://css-tricks.com/debouncing-throttling-explained-examples/

TL'DR
Throttle limits the occurence of events to only one per given time interval.
Debounce only fires one event after a given time of inactivity.

These operations and many others are part of the reactive extension spec and will be part of a future Spring4D release that brings RX to Delphi.

Comments

  1. Stéphane WierzbickiAugust 24, 2017 at 4:15 AM

    Stefan Glienke​, are you alone to develop Sprind4D ? I really enjoy this wonderful library !

    ReplyDelete
  2. Stefan GlienkeAugust 24, 2017 at 5:34 AM

    Thanks, I got some help from Honza Rameš and other people in the past and mostly Baoquan Zuo who started that project several years ago ;)

    It's hard to find excellent developers with enough time that are able to bear with me ;)

    ReplyDelete
  3. Dalija PrasnikarAugust 24, 2017 at 6:09 AM

    Stefan Glienke I could bear with you, but I don't have enough time ;-)

    Excellent... you are really asking way too much ;-)

    ReplyDelete
  4. Stefan GlienkeAugust 24, 2017 at 11:07 AM

    FWIW this is the code for a delayed search while the user is typing into an edit using Spring.Reactive:

    TObservable.FromEventPattern(Edit1, 'OnChange')
    .Throttle(1000)
    .ObserveOn(TScheduler.MainThread)
    .Subscribe(
    procedure(const args: TNotifyEventArgs)
    begin
    Caption := Format('searching for %s', [TEdit(args.Sender).Text]);
    end);

    ReplyDelete
  5. Rafael DipoldAugust 24, 2017 at 1:42 PM

    Very nice! These days I was, just for fun, trying to implement this behavior by following the http://reactivex.io specs.

    Maybe you can make this an independent library and add Delphi language as official in http://reactivex.io/languages.html

    ReplyDelete
  6. Stefan GlienkeAugust 24, 2017 at 4:09 PM

    Rafael Dipold Certainly not independent because it uses some things from Spring.pas and Collections.

    Once it is done (still a lot of work, most likely for months) I will add Delphi to their list for sure.

    ReplyDelete
  7. Edwin YipAugust 27, 2017 at 1:24 AM

    Wow, Both of the two are new concept to me, thanks Stefan, and I'm looking forward to the said new features for spring4d!

    ReplyDelete

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