I was hoping that calling the Start method of the interactor would help, but in the source file of the QVTKInteractor I found this:<br><br><pre class="fragment"><font size="4">00267 <span class="comment">// Description:</span><br>
<a name="l00268"></a>00268 <span class="comment">// Overloaded start method does nothing.</span><br><a name="l00269"></a>00269 <span class="comment">// Use qApp->exec() instead.</span></font><br></pre>That is why I think it only works in the <span style="color: rgb(255, 0, 0);">main</span> function. I can not call the qApp->exec in the constructor of my Dialog class.<br>
<br><br>Luis<br><br><div class="gmail_quote">On Wed, Feb 11, 2009 at 2:55 AM, Luis Roberto P. Paula <span dir="ltr"><<a href="mailto:luisrpp@gmail.com">luisrpp@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
Hi Clint,<br><br>In the main window of my application I have a QVTKWidget. I have set some callbacks to detect mouse events and in this window everything is working fine.<br><br>Then I tried to open a second window (QDialog for example) by clicking on a button of the main window. In this second window I have also a QVTKWidget object. I'm displaying an 2D image on it with the vtkImageViewer2 and the zoom control with the mouse wheel is working fine (default action). The problem is with the callback that I have created. In the constructor of my QDialog class it is set like this:<br>
<br> vtkImageInteractionCallback* callback = vtkImageInteractionCallback::New();<br> imageStyle->AddObserver(vtkCommand::MouseMoveEvent, callback);<br> imageStyle->AddObserver(vtkCommand::LeftButtonPressEvent, callback);<br>
imageStyle->AddObserver(vtkCommand::LeftButtonReleaseEvent, callback);<br><br> vtkWidget->GetRenderWindow()->GetInteractor()->SetInteractorStyle(imageStyle);<br><br>None of this events are being captured.<br>
<br>I thought it could be something wrong in the code, but when I tried to load this second window as the main window, everything worked.<br><br> int main(int argc, char *argv[])<br> {<br> QApplication app(argc, argv);<br>
<br> /*MyGui* mainWindow = new MyGui;<br> mainWindow->show();*/<br><br> MyDialog* dialog = new MyDialog; // HERE IT WORKS, BUT THE DIALOG SHOULD BE PART OF THE MAIN WINDOW.<br>
dialog>show();<br><br> return app.exec();<br> }<br><br>Do you know why this is happening?<br><br>Thanks,<br><font color="#888888">Luis</font><div><div></div><div class="Wj3C7c"><br><br><div class="gmail_quote">
On Wed, Feb 11, 2009 at 2:15 AM, Clinton Stimpson <span dir="ltr"><<a href="mailto:clinton@elemtech.com" target="_blank">clinton@elemtech.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;"><br>
So which callbacks aren't working? I don't see how trying to make another event loop would solve a callback problem.<br>
If its a dialog, why not call exec() on it instead of show() ? exec() will create a temporary local event loop (see QEventLoop).<br>
Also, each thread can only have one event loop active at a time, and all Qt widgets are on the same thread.<br>
<br>
Clint<br>
<br>
Luis Roberto P. Paula wrote:<br>
<blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
I have set the second window as a Dialog window and open it as modal. For some reason, the callback for this new window are not being observed.<br>
<br>
On Tue, Feb 10, 2009 at 1:04 AM, Luis Roberto P. Paula <<a href="mailto:luisrpp@gmail.com" target="_blank">luisrpp@gmail.com</a> <mailto:<a href="mailto:luisrpp@gmail.com" target="_blank">luisrpp@gmail.com</a>>> wrote:<br>
<br>
Hi All,<br>
<br>
Since QVTKInteractor cannot control the event loop, how do I start<br>
a second window after the click of a button and make this new<br>
window to have its own event loop?<br>
<br>
When the button is clicked, this action is performed:<br>
<br>
MyWidget* widget = new MyWidget();<br>
widget->show();<br>
<br>
The new window appears, but to make the interactor to work, there<br>
should be a command like:<br>
<br>
qApp->exec();<br>
<br>
but QT does not allow me to start a new GUI event loop.<br>
<br>
Does anybody can help me?<br>
<br>
Thanks,<br>
Luis<br>
<br>
<br>
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