another setMouseTracking(true) not working; QWidget

[vonCZ]

hey pdolbey- thanks for chiming in. True, I used to have that line

SoQtExaminerViewer *eviewer = new SoQtExaminerViewer(this);

SoQtExaminerViewer *eviewer = new SoQtExaminerViewer(this);

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before you posted your example of how you do it, which I now follow:

//++ main.cpp
int main(argc, *argv[])
{
  Window window;
 
//++ window.cpp
Window::Window()
{
  coinWidget = new CoinWidget;
 
//++ coinwidget.cpp
CoinWidget::CoinWidget(QWidget *parent) : QWidget(parent)
{
  SoQt::init(this);
  model = new Model(this);
  model->setDefaultScene();
 
//++ model.cpp
Model::Model(QWQWidget *parent, const char * name, const SbBool embed)
  : SoQtExaminerViewer( parent, name, embed, SoQtFullViewer::BUILD_POPUP, SoQtViewer::BROWSER, TRUE)
{
  QWidget *widget = this->buildWidget(this->getParentWidget());
  this->setBaseWidget(widget);

//++ main.cpp
int main(argc, *argv[])
{
  Window window;

//++ window.cpp
Window::Window()
{
  coinWidget = new CoinWidget;

//++ coinwidget.cpp
CoinWidget::CoinWidget(QWidget *parent) : QWidget(parent)
{
  SoQt::init(this);
  model = new Model(this);
  model->setDefaultScene();

//++ model.cpp
Model::Model(QWQWidget *parent, const char * name, const SbBool embed)
  : SoQtExaminerViewer( parent, name, embed, SoQtFullViewer::BUILD_POPUP, SoQtViewer::BROWSER, TRUE)
{
  QWidget *widget = this->buildWidget(this->getParentWidget());
  this->setBaseWidget(widget);

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So, I'm not sure how this affects your take on this. Given this method, is "its possible that on Windows this is done by subclassing the native WindowProc" still something to worry about?

Again, the confusing thing to me: both of the Window class event filters

bool Window::eventFilter(QObject *obj, QEvent *event)
//  OR
void Window::mouseMoveEvent(QMouseEvent *event)

bool Window::eventFilter(QObject *obj, QEvent *event)
//  OR
void Window::mouseMoveEvent(QMouseEvent *event)

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*will* recognize the mouse Move event... but only if the button is pressed.

[pdolbey]

The coin SVN is responding better now. I've discovered some interesting code in
http://source.coin3d.org/viewvc.py/S...pp?view=markup
that shows up an eventFilter function that runs in a private implementation widget. Some of the comments indicate that the result your getting is not very suprising.

Do you want to send me another code extract? Have you still got my email address?

Pete

[vonCZ]

your email is on my infected computer--i got careless w/torrents--so no, I don't have it at the moment. But here are the files. The window, model, and coinwidget .cpp/.h files are probably the only ones relevant, but I included the others in case you want to compile. (though it'll crash at run-time without the .iv files; i need to fix this.)

Anyway, I tried adding an eventFilter to the Model class, but as you said it doesn't inherit from QWidget.... so this:

bool Model::eventFilter(QObject *obj, QEvent *event)
{
  return QWidget::eventFilter(obj, event);
}

bool Model::eventFilter(QObject *obj, QEvent *event)
{
  return QWidget::eventFilter(obj, event);
}

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causes an error when compiling: "QObject::eventFilter : illegal call of non-static member function." Perhaps there's a way around this?

BTW, the reason I want to get the mouse Events in Qt: I'm using the SoQtExaminerViewer class for rendering. I have a function set up so that the user can mouse over the model and get the x,y,z coordinates of that spot on the model. However, it only works in selection mode, e.g.

Model::setViewing(false);

but I want it to work in the other mode, as well. So I figured I'd forward the mousePosition to the Model class from Qt so that the feature would work in both selection and non-selection mode. Perhaps there's an easier/better way?

[marcel]

But you got me all wrong.
I suggested to install an event filter on the QWidget returned by this->buildWidget(this->getParentWidget());.

The event filter should be the parent widget.

Hope it's clear now.

Regards

[vonCZ]

Oh, ok. It didn't work. I added:

//    model.cpp
 
QWidget *Model::returnBase()
{
  QWidget *widget = this->getBaseWidget();
  return widget;
}

//    model.cpp

QWidget *Model::returnBase()
{
  QWidget *widget = this->getBaseWidget();
  return widget;
}

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to the Model class, and the last 2 lines below:

//    coinwidget.cpp
CoinWidget::CoinWidget(QWidget *parent) : QWidget(parent)
{
  SoQt::init(this);
 
  model = new Model(this);
  model->setDefaultScene();
 
  model->returnBase()->installEventFilter(this);
  model->returnBase()->setMouseTracking(true);
 
}

//    coinwidget.cpp
CoinWidget::CoinWidget(QWidget *parent) : QWidget(parent)
{
  SoQt::init(this);

  model = new Model(this);
  model->setDefaultScene();

  model->returnBase()->installEventFilter(this);
  model->returnBase()->setMouseTracking(true);

}

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to the CoinWidget class. I removed all eventFilters except the one in CoinWidget. As before, the eventFilter is called when I do a mouseMove event over it, but only when the mouse Button is pressed.

[vonCZ]

pdolbey- in a nutshell, I've the following callback in my coin3d code (Model class):

void Model::myMouseMoveCB(void *data, SoEventCallback *eventCB)
{
 
  qDebug("...hello");
 
  SoSeparator *root = (SoSeparator *) data;
  const SoEvent *event = eventCB->getEvent();
  const SbViewportRegion &myRegion = eventCB->getAction()->getViewportRegion();
  showXYZ(root, myRegion, event->getPosition(myRegion));
  eventCB->setHandled();
 
}

void Model::myMouseMoveCB(void *data, SoEventCallback *eventCB)
{

  qDebug("...hello");

  SoSeparator *root = (SoSeparator *) data;
  const SoEvent *event = eventCB->getEvent();
  const SbViewportRegion &myRegion = eventCB->getAction()->getViewportRegion();
  showXYZ(root, myRegion, event->getPosition(myRegion));
  eventCB->setHandled();

}

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The problem is: the callback is only called when

Model::this->setViewing(false);

This is the reason I've been pursuing the Qt route; I thought I could just send the screenPosition coordinates (over the widget) straight from Qt to Coin, but it's looking like this might not be possible.

[pdolbey]

VonCZ

According to the coin SVN repository, the SoWin viewers do exactly what I expected to see i.e. registering and creating a window with window proc, then creating a OpenGL context, but the SoQt viewers are doing some wierd and wonderful stuff with pimpl classes. If the sample you posted above can reporduce the problem I'll pull it down tonight and try debuging throught the coin code, although I'm trying to sort out some OpenCascade problems ( of my own creation ) at the moment. Otherwise, you can post it to "peter at dolbey dot freeserve dot co dot uk".

Pete

[vonCZ]

thanks for the solution, pdolbey! Rather than re-write the email he posted, I'll quote it here:

Basically SoQt is a rats nest of widgets, pimpls (er that's private implementations) and miscellaneous filters. Unfortunately your attempts at hacking the filters have taken a bit of a scattergun approach, but I can understand why.

However I've attached a hack which might just work for you, only changing the Model class source files. Basically, the SoQtGLRenderArea class (a parent of SoQtExaminerViewer) sets up an eventfilter on a private widget that it processes with a processEvents method. What I've done with the Model class (even though its not technically a Qt widget) is to over-ride the processEvents method and put in a hook to the Model::mouseMoveEvent. You need to let the event still be processed by the parent classs so it can translate to the SoEvent model, but the method is defined as protected not private so this technique must be "allowed".

and the changes/additions to the Model class are:

//++++    model.h
 
#include <QEvent>
#include <QMouseEvent>
 
  protected:
    void    mouseMoveEvent(QMouseEvent *event);
    void    processEvent(QEvent *event);
 
 
 
//++++    model.cpp
 
void Model::mouseMoveEvent(QMouseEvent *event)
{
  qDebug("Model::  %d  %d", event->x(), event->y() );
}
 
void Model::processEvent(QEvent *event)
{
  if (event->type() == QEvent::MouseMove)
  {
    mouseMoveEvent ((QMouseEvent*) event);
  }
  SoQtExaminerViewer::processEvent(event);
}

//++++    model.h

#include <QEvent>
#include <QMouseEvent>

  protected:
    void    mouseMoveEvent(QMouseEvent *event);
    void    processEvent(QEvent *event);



//++++    model.cpp

void Model::mouseMoveEvent(QMouseEvent *event)
{
  qDebug("Model::  %d  %d", event->x(), event->y() );
}

void Model::processEvent(QEvent *event)
{
  if (event->type() == QEvent::MouseMove)
  {
    mouseMoveEvent ((QMouseEvent*) event);
  }
  SoQtExaminerViewer::processEvent(event);
}

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thanks again!