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  1. Qt
  2. QTBUG-96192

Performance concerns for a qmlengine->retranslate() call

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    • Platform/s:
      All
    • Commits:
      d4039298e710b6b79c018589bcc2145e22e1d5aa (qt/qtdeclarative/dev) f51231164e7074bfcd4deea31e82428b31483e53 (qt/qtdeclarative/6.2)

      Description

        When we call qmlengine->retranslate() for a dynamic language translation, void QQmlContextData::refreshExpressions() in qqmlcontext.cpp will be called and re-evaluate (refresh) including "all" expressions regardless of language change.

      781 void QQmlContextData::refreshExpressions()
      782 {  
      783     bool isGlobal = (parent == nullptr);
      784    
      785     // For efficiency, we try and minimize the number of guards we have to create
      786     if (expressions_to_run(this, isGlobal) && childContexts) {
      787         QQmlGuardedContextData guard(this);
      788    
      789         childContexts->refreshExpressionsRecursive(isGlobal); 
      790    
      791         if (!guard.isNull() && expressions_to_run(this, isGlobal))
      792             refreshExpressionsRecursive(expressions);
      793    
      794     } else if (expressions_to_run(this, isGlobal)) {
      795 
      796         refreshExpressionsRecursive(expressions);
      797 
      798     } else if (childContexts) {
      799 
      800         childContexts->refreshExpressionsRecursive(isGlobal);
      801 
      802     }
      803 } 

       

      Although we can use trick such as https://wiki.qt.io/How_to_do_dynamic_translation_in_QML without qmlengine->retranslate() but it's not a general way.

       

      In particular, in a customer's specific environment, dozens of applications are simultaneously executed, so performance concerns are high.

       

      So I want to know if there are any plans for performance improvement.

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              Assignee:
              fabiankosmale Fabian Kosmale
              Reporter:
              seokhako Seokha Ko
              PM Owner:
              Vladimir Minenko Vladimir Minenko
              RnD Owner:
              Alex Blasche Alex Blasche
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              1 Vote for this issue
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              16 Start watching this issue

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                Created:
                Updated:
                Resolved:

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