Re: [Wxart2d-users_dev] Potential memory issues in inherited a2dDrawing

[Mike G. <mik...@da...>]

I switched back to a normal a2dDrawing. After editing, I close the 
dialog. When I reopen and try to edit, I get this error:


I also get odd behavior like malfunctioning controls in the UI as if 
there is some underlying memory issue.




On 11/4/2016 4:35 PM, klaas.holwerda wrote:
> Hi,
>
> I do not see these functions in your drawing class, so why are they 
> there? Maybe not the issue but strange.
>
>      EVT_IDLE( MyDrawing::OnIdle )
>      EVT_COM_EVENT( MyDrawing::OnComEvent )
>      EVT_NEW_CAMELEON( MyDrawing::OnAddCameleon )
>      EVT_UNDO( MyDrawing::OnUndoEvent )
>      EVT_REDO( MyDrawing::OnRedoEvent )
>      EVT_CHANGEDMODIFY_DRAWING( MyDrawing::OnChangeDrawings )
>
> For the rest I see nothing wrong.
> How do you set this drawing to the canvas?
> If you do not do your extra stuff, is it functioning as before?
> Meaning with the normal a2dDrawing, it behaves correctly, if nothing 
> extra done in you drawing class, it should behave the same.
>
> I do not push event handlers, but do connect dynamic events .
> So no idea what is causing the error you get.
>
> Regards,
>
> Klaas
>
>
>
> On 11/04/2016 06:33 PM, Mike Gibson wrote:
>>
>> Hello,
>>
>> I have my own class derived from an a2dDrawing that is giving me some 
>> issues that appear to be caused by invalid memory access. I've 
>> created my own class so that I can handle some a2dCanvasObject 
>> editing events. When an object is edited via mouse on the canvas, I 
>> record the changes in a wxPropertyGrid. However, the editing on the 
>> canvas can get glitchy (the shape, while being edited can jump 
>> around), and I've found that after I'm done editing and return to my 
>> program's main UI, that various elements can be affected (such as 
>> another unrelated property grid will become uneditable, or I am 
>> unable to re-open my canvas editing window).
>>
>> Any time this issue occurs, when I close my program, I get the 
>> following error message TWICE (which does not appear if I do not use 
>> the editor):
>>
>>
>> Here is my a2dDrawing in the header:
>>
>> class MyDrawing: public a2dDrawing
>> {
>>     DECLARE_EVENT_TABLE()
>>     public:
>>         MyDrawing(const wxString &name=wxT(""), a2dHabitat *habitat=NULL)
>>         : a2dDrawing(name, habitat){ m_Owner = NULL; }
>>
>>         void SetOwner(TDlgPhotoAreas *Owner) { m_Owner = Owner; }
>>
>>         MyDrawing(const a2dDrawing &other, CloneOptions options, 
>> a2dRefMap *refs)
>>             : a2dDrawing(other, options, refs){ m_Owner = NULL; }
>>
>>         ~MyDrawing(){}
>>
>>         virtual void OnDoEvent( a2dCommandProcessorEvent &event);
>>
>>     private:
>>         TDlgPhotoAreas *m_Owner;
>> };
>>
>>
>> and the entire cpp code for the a2dDrawing class:
>>
>> BEGIN_EVENT_TABLE( MyDrawing, a2dDrawing )
>>      EVT_IDLE( MyDrawing::OnIdle )
>>      EVT_COM_EVENT( MyDrawing::OnComEvent )
>>      EVT_NEW_CAMELEON( MyDrawing::OnAddCameleon )
>>      EVT_DO( MyDrawing::OnDoEvent )
>>      EVT_UNDO( MyDrawing::OnUndoEvent )
>>      EVT_REDO( MyDrawing::OnRedoEvent )
>>      EVT_CHANGEDMODIFY_DRAWING( MyDrawing::OnChangeDrawings )
>> END_EVENT_TABLE()
>>
>>
>> void MyDrawing::OnDoEvent( a2dCommandProcessorEvent &event)
>> {
>>     a2dCommand *Command = event.GetCommand();
>>     const a2dCommandId *ComId = Command->GetCommandId();
>>
>>     a2dCanvasObject *Obj =
>>             wxDynamicCast(Command, 
>> a2dCommand_AddObject)->GetCanvasObject();
>>
>>     if ( ComId == &a2dCommand_SetProperty::Id)
>>     {
>>
>>         if (Obj)
>>         {
>>             a2dRect *Rect = wxDynamicCast(Obj, a2dRect);
>>
>>             if (m_Owner)
>>                 m_Owner->EditRectangleFromCanvas(Rect);
>>         }
>>
>>
>>
>>     }
>>
>>     if (event.GetCommand()->Modifies())
>>         Modify(true);
>>
>> }
>>
>> Any idea what is causing the issue?
>>
>>
>> Thanks,
>>
>> - Mike
>>
>>
>>
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>
>
>
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