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Jeroen W. Pluimers on .NET, C#, Delphi, databases, and personal interests

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Updating Actions (Don’t Do This) – Dave’s Development Blog

Posted by jpluimers on 2020/05/13

I remember fixing a high CPU toggling the Enabled property in an OnUpdate even handler on a TCustomAction descendant quite some time ago, but wasn’t completely sure of the exact cause.

My fix was to only set it once every clock tick (about every 20 milliseconds).

The best fix would have been not to toggle at all: just calculate the right result, then only set the Enabled property once: [WayBack] Updating Actions (Don’t Do This) – Dave’s Development Blog

–jeroen

This entry was posted on 2020/05/13 at 06:00 and is filed under Delphi, Development, Software Development. You can follow any responses to this entry through the RSS 2.0 feed. You can leave a response, or trackback from your own site.

2 Responses to “Updating Actions (Don’t Do This) – Dave’s Development Blog”

  1. SilverWarior's avatar

    SilverWarior said

    2020/05/13 at 10:23

    Doesn’t changing the Enabled property fire the OnUpdate event in the first place? So changing Enabled property inside OnUpdate event method could teoretically lead to infinite loop.

    Reply
    • jpluimers's avatar

      jpluimers said

      2020/05/31 at 17:47

      I’m not sure. During my fight with rectum cancer, I will hardly do any Delphi stuff at all.

      So if you have more time/energy: please check out and report back.

      Thanks in advance!

      Reply

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