[vtkusers] Mouse button release event is still broken in VTK 6.0.0 !

[David Cole]

Hi Mengda,

This is not really "broken" -- it's more "by design," but with an 
unfortunately non-obvious way to do what you want.

If, instead of adding your observers to the render window interactor, 
you add them to the interactor's current style, you will see that the 
events are indeed invoked. But by default, the interactor style "eats" 
the left button up event such that the render window interactor never 
sees it. You can change this behavior by creating your own custom 
interactor style if you want to override it. (Or use one of the many 
other different types of interactor style available in VTK.)

I added your code to this example...

     
http://www.vtk.org/Wiki/VTK/Examples/Cxx/Interaction/ObserverMemberFunction

...and then put this code just before the call to "Start":

    ...
     vtkInteractorObserver *currentStyle = 
renderWindowInteractor->GetInteractorStyle();
     std::cout << "currentStyle class name: " << 
currentStyle->GetClassName() << std::endl;

     vtkInteractorStyleSwitch *iss = 
vtkInteractorStyleSwitch::SafeDownCast(currentStyle);
    vtkInteractorObserver *actualStyle = iss->GetCurrentStyle();
     std::cout << "actualStyle class name: " << 
actualStyle->GetClassName() << std::endl;

     vtkSmartPointer<CRRotateCallBack> crk = 
vtkSmartPointer<CRRotateCallBack>::New();
     actualStyle->AddObserver(vtkCommand::LeftButtonPressEvent, crk, 
10.0f);
    //actualStyle->AddObserver(vtkCommand::MouseMoveEvent, crk, 10.0f);
     actualStyle->AddObserver(vtkCommand::LeftButtonReleaseEvent, crk, 
10.0f);

    renderWindowInteractor->Start();
    ...


One more change: I changed the beginning of your Execute callback to 
expect a different type of caller object:

     vtkInteractorObserver *iobs = 
vtkInteractorObserver::SafeDownCast(caller);
    if( !iobs )
    {
      return;
    }


The output looks like this when I run it and click in the window:

    currentStyle class name: vtkInteractorStyleSwitch
    actualStyle class name: vtkInteractorStyleJoystickCamera
    LeftButtonPressEvent
    LeftButtonReleaseEvent


HTH,
David C.


-----Original Message-----
From: Mengda Wu <wumengda at gmail.com>
To: vtkusers <vtkusers at vtk.org>
Cc: clinton <clinton at elemtech.com>; EvilMax <maxim.privalov at gmail.com>
Sent: Sun, Dec 1, 2013 9:19 pm
Subject: [vtkusers] Mouse button release event is still broken in VTK 
6.0.0 !



Hi all,


   I found this series is very relevant to my issue.



   I am also trying to catch the LeftButtonReleaseEvent event in VTK 
6.0.0. I believe it is still broken. Basically, I added observers of 
LeftButtonPressEvent, MouseMoveEvent, and LeftButtonReleaseEvent to 
RenderWindowInteractor. Only LeftButtonPressEvent and  MouseMoveEvent 
got tracked in the C++ callback function. No LeftButtonReleaseEvent was 
observed.


What I did was:


vtkSmartPointer<CRRotateCallBack> crk = 
vtkSmartPointer<CRRotateCallBack>::New();
     
this->ui->view1->GetInteractor()->AddObserver(vtkCommand::LeftButtonPress
Event, crk, 10.0f);  
this->ui->view1->GetInteractor()->AddObserver(vtkCommand::MouseMoveEvent,
  crk, 10.0f);        
this->ui->view1->GetInteractor()->AddObserver(vtkCommand::LeftButtonRelea
seEvent, crk, 10.0f);

class CRRotateCallBack : public vtkCommand
{
public:
    static CRRotateCallBack *New() {return new CRRotateCallBack;}

    virtual void Execute(vtkObject *caller, unsigned long eventId, 
void*)
    {
        vtkRenderWindowInteractor *iren = 
vtkRenderWindowInteractor::SafeDownCast(caller);
        if( !iren ) return;

        if( eventId == vtkCommand::LeftButtonPressEvent )
        {
            std::cout << "LeftButtonPressEvent" << std::endl;
        }
        else if( eventId == vtkCommand::MouseMoveEvent )
        {
            std::cout << "MouseMoveEvent " << std::endl;
        }
        else if( eventId == vtkCommand::LeftButtonReleaseEvent )    
//for some reason, this left mouse release event never gets here
        {
            std::cout << "LeftButtonReleaseEvent " << std::endl;
        }
    }
};


Thanks,

Mengda






On Mon, Oct 31, 2011 at 4:25 PM, Sebastien Jourdain 
<sebastien.jourdain at kitware.com> wrote:

Hi Max,

I get that but when I was monitoring the event that was happening on a
C++ observer, I've noticed the following order.

LeftButtonPressEvent
StartInteractionEvent
ModifiedEvent
EndInteractionEvent
RenderEvent

So despite the fact that ReleaseEvent is not properly propagated (even
in the C++ layer), I was wondering if you could rely on the
EndInteractionEvent while we fix this bug ? Because, this event seems
to map at the release time...

Does it make sense ?

At lease let me know if this could fix your issue temporarily...

Thanks,

Seb

PS: If I get more time, I will track down the reason why the
ReleaseEvent get digested...



On Mon, Oct 31, 2011 at 4:16 PM, EvilMax <maxim.privalov at gmail.com> 
wrote:
> Hi, Sebastien!
>
> I need to implement dragging of an actors, so I really need to track 
mouse
> button release event.
>
> --
> View this message in context: 
http://vtk.1045678.n5.nabble.com/Mouse-button-release-is-still-broken-in-5-8-0-tp4949887p4953458.html
> Sent from the VTK - Users mailing list archive at Nabble.com.
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