[vtkusers] Interactor on vtkWidget

[Leonardo M. Ramé]

Well, maybe. The distance widget is just an example, in my app I want to
add distance widgets, angle widgets and also "text" widgets, to let the
user annotate a Dicom Image, and in some cases, the user would want to
use more than one instance of those widgets.


On 2010-09-21 15:46:19 +0100, Jothy wrote:
> Whenever I click the distance button it create a new widget and places in
> the active render window and able to manipulate independently. But the only
> problem is when I want to delete anyone, all goes off!
> 
> I don't know if you want to use multiple distance widget in a single render
> window.
> 
> 
> Jothy
> 
> On Tue, Sep 21, 2010 at 3:30 PM, Leonardo M. Ramé <l.rame at griensu.com>wrote:
> 
> > On 2010-09-21 15:25:34 +0100, Jothy wrote:
> > >
> > > On Tue, Sep 21, 2010 at 3:20 PM, Leonardo M. Ramé <l.rame at griensu.com
> > >wrote:
> > >
> > > > Hi, I created a vtkDistanceWidget, and added an observer to catch the
> > > > "delete" key on that widget, to be able to delete it from the scene.
> > > >
> > > > The problem is that key events are captured for the whole interactor,
> > > > and not for my specific widget. How can I know what was the active
> > > > widget at the moment of pressing the delete key?.
> > > >
> > > >
> > > > This is my code:
> > > >
> > > > void widgetPickObserver(vtkObject* caller, unsigned long eid, void*
> > > > clientdata, void *calldata)
> > > > {
> > > >  qDebug(static_cast<vtkRenderWindowInteractor*>(caller)->GetKeySym());
> > > > }
> > > >
> > > > void myClass::addDistanceWidget()
> > > > {
> > > >  distanceWidget = vtkDistanceWidget::New();
> > > >  distanceWidget->SetInteractor(this->GetInteractor());
> > > >  distanceWidget->CreateDefaultRepresentation();
> > > >  static_cast<vtkDistanceRepresentation
> > > > *>(distanceWidget->GetRepresentation())->SetLabelFormat("%-#6.3g mm");
> > > >
> > > >  vtkSmartPointer<vtkCallbackCommand> Callback =
> > > > vtkSmartPointer<vtkCallbackCommand>::New();
> > > >  Callback->SetCallback(widgetPickObserver);
> > > >  Callback->SetClientData(distanceWidget);
> > > >
> > > >
> >  distanceWidget->GetInteractor()->AddObserver(vtkCommand::KeyPressEvent,
> > > > Callback);
> > > >  distanceWidget->On();
> > > > }
> > > >
> > > >
> > > > --
> > > > Leonardo M. Ramé
> > > > http://leonardorame.blogspot.com
> >
> > > What I did in my Qt program was - used a toggle button on the toolbar to
> > > enable and disable the distance widget.
> > >
> > > Jothy
> >
> > Yes, but what if you need more than one distance widgets? how do you
> > know which one is selected?
> >
> > --
> > Leonardo M. Ramé
> > http://leonardorame.blogspot.com
> >

-- 
Leonardo M. Ramé
http://leonardorame.blogspot.com