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<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>I’d like to use my custom callbacks sometimes, but
then I’d like to be able to switch back to the default <span
class=SpellE>vtkInteractorStyleSwitch</span> behavior. How do I do that? I use
the <span class=SpellE>vtkInteractorStyleUser</span> like below. It seems the <span
class=SpellE>AddObserver</span> method would not change the default observer,
but it does. <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><span style='mso-spacerun:yes'> </span><span
class=SpellE><span class=GramE>vtkInteractorStyleUser</span></span> *<span
class=SpellE>isu</span> = <span class=SpellE>vtkInteractorStyleUser::New</span>();<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><span style='mso-spacerun:yes'> </span>// Method 1<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><span style='mso-spacerun:yes'> </span><span
class=SpellE><span class=GramE>isu</span></span>-><span class=SpellE>SetLeftButtonPressMethod</span>(&<span
class=SpellE>LBCallback</span>, (void *)<span class=SpellE>isu</span>);<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><span style='mso-spacerun:yes'> </span>// or Method 2<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><span style='mso-spacerun:yes'> </span>// Here is
where we setup the observer, we do a new and delete after<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><span style='mso-spacerun:yes'> </span>// tying it to
the callback for correct reference counting<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><span style='mso-spacerun:yes'> </span><span
class=SpellE><span class=GramE>myCallback</span></span> *<span class=SpellE>mcb</span>
= <span class=SpellE>myCallback::New</span>();<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><span style='mso-spacerun:yes'> </span><span
class=SpellE><span class=GramE>isu</span></span>-><span class=SpellE>AddObserver</span>(<span
class=SpellE>vtkCommand::LeftButtonReleaseEvent,mcb</span>);<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><span style='mso-spacerun:yes'> </span></span></font><font
size=2 face=Arial><span lang=DE style='font-size:10.0pt;font-family:Arial;
mso-ansi-language:DE'>mcb->Delete();<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=DE style='font-size:10.0pt;
font-family:Arial;mso-ansi-language:DE'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=DE style='font-size:10.0pt;
font-family:Arial;mso-ansi-language:DE'><span style='mso-spacerun:yes'>
</span><o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=DE style='font-size:10.0pt;
font-family:Arial;mso-ansi-language:DE'><span style='mso-spacerun:yes'>
</span>vtkRenderer *ren1 = vtkRenderer::New();<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=DE style='font-size:10.0pt;
font-family:Arial;mso-ansi-language:DE'><span style='mso-spacerun:yes'>
</span></span></font><span class=SpellE><span class=GramE><font size=2
face=Arial><span style='font-size:10.0pt;font-family:Arial'>vtkRenderWindow</span></font></span></span><font
size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'> *<span
class=SpellE>renWin</span> = <span class=SpellE>vtkRenderWindow::New</span>();<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><span style='mso-spacerun:yes'> </span><span
class=SpellE><span class=GramE>renWin</span></span>-><span class=SpellE>AddRenderer</span>(ren1);<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><span style='mso-spacerun:yes'> </span><span
class=SpellE><span class=GramE>vtkRenderWindowInteractor</span></span> *<span
class=SpellE>iren</span> = <span class=SpellE>vtkRenderWindowInteractor::New</span>();<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><span style='mso-spacerun:yes'> </span><span
class=SpellE><span class=GramE>iren</span></span>-><span class=SpellE>SetRenderWindow</span>(<span
class=SpellE>renWin</span>);<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><span style='mso-spacerun:yes'> </span><span
class=SpellE><span class=GramE>iren</span></span>-><span class=SpellE>SetInteractorStyle</span>(<span
class=SpellE>isu</span>);<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoAutoSig><font size=3 face="Times New Roman"><span style='font-size:
12.0pt;mso-no-proof:yes'>Sven<o:p></o:p></span></font></p>
<p class=MsoAutoSig><font size=3 face="Times New Roman"><span style='font-size:
12.0pt;mso-no-proof:yes'><o:p> </o:p></span></font></p>
<p class=MsoAutoSig><font size=3 face="Times New Roman"><span style='font-size:
12.0pt;mso-no-proof:yes'>May all beings know the ease of living.<o:p></o:p></span></font></p>
<p class=MsoAutoSig><font size=3 face="Times New Roman"><span style='font-size:
12.0pt;mso-no-proof:yes'>May all beings live in peace.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
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