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Bug Report T715361
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An AV occurs on calling a layout item's PutIntoHiddenGroup function

created 6 years ago

Hello.

I found an EAccessViolation in PutIntoHiddenGroup. Run attached example and press "Add check" button.
It seems that the newly created group is destroyed during setting its Container property:

Delphi
function TdxLayoutContainer.CreateItem(AItemClass: TdxCustomLayoutItemClass = nil; AParent: TdxCustomLayoutGroup = nil): TdxCustomLayoutItem;  
begin  
  if AItemClass = nil then  
    AItemClass := GetDefaultItemClass;  
  Result := AItemClass.Create(ItemsOwner);  
  Result.Container := Self;  
  Result.Parent := AParent;  
  Modified;  
end;
Comments (2)
DevExpress Support Team 6 years ago

    Hello,

    Thank you for sharing your sample project. I reproduced this exception and forwarded this ticket to our developers for research. It may take us some time to examine this scenario.

    AP AP
    Anton Plotnikov 6 years ago

      Hello, Paulo.

      It seems that I found a temporary workaround. I overrode the constructor in the TdxLayoutAutoCreatedGroup class:

      Delphi
      constructor TdxLayoutAutoCreatedGroup.Create(AOwner: TComponent);  
begin  
  inherited Create(AOwner);  

  if (not (csDesigning in ComponentState)) then  
    WrapItemsMode:= wmImmediateChildren;  
end;

      But it will be nice if your developers will suggest a more optimal fix ASAP.

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      Answers approved by DevExpress Support

      created 6 years ago

      We have fixed the issue described in this ticket and will include the fix in our next maintenance update. To apply this solution before the official update, request a hotfix by clicking the corresponding link for product versions you require.

      Note: Hotfixes may be unavailable for beta versions and updates that are about to be released.

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