Problem got my attention so I quickly implemented a test app.

Qt Code: 
  1. #ifndef FILTER_H
  2. #define FILTER_H
  3.  
  4. #include <QtCore>
  5. #include <QtGui>
  6. #include <QDebug>
  7. #include <QtScript>
  8.  
  9. class MoveEventFilter : public QObject
  10. {    Q_OBJECT
  11.  
  12. public:
  13.     MoveEventFilter(QWidget* parent = 0) : QObject(parent) {
  14.         canMove = false;
  15.     }
  16.     bool canMove;
  17.  
  18. protected:
  19.     bool eventFilter(QObject *obj, QEvent *event)
  20.     {
  21.         QMetaObject mo = QEvent::staticMetaObject;
  22.         qDebug() << obj->objectName() << mo.enumerator(mo.indexOfEnumerator("Type")).valueToKey(event->type());
  23.  
  24.         if (event->type() == QEvent::MouseMove ){
  25.             QMouseEvent* me = static_cast<QMouseEvent*>(event);
  26.             qDebug() << QString("(%1|%2)").arg(me->pos().x()).arg(me->pos().y());
  27.             return true;
  28.         }
  29.  
  30.         return QObject::eventFilter(obj, event);
  31.     }
  32. };
  33.  
  34. class MouseTrack : public QLabel
  35. {    Q_OBJECT
  36. public:
  37.     MouseTrack(QWidget* parent = 0) : QLabel(parent) {
  38.     }
  39. };
  40.  
  41. #endif // FILTER_H
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Qt Code: 
  1. #include <QtCore>
  2. #include <QtGui>
  3.  
  4. #include "filter.h"
  5.  
  6. int main(int argc, char *argv[])
  7. {
  8.     QApplication a(argc, argv);
  9.  
  11.     QTextEdit* te = new QTextEdit();
  12.     te->setObjectName("textedit");
  13.  
  14.     MouseTrack* mt = new MouseTrack();
  15.     mt->setMinimumHeight(100);
  16.     mt->setObjectName("MouseTrack");
  17.  
  18.     MoveEventFilter* filter = new MoveEventFilter();
  19.  
  20.     te->setMouseTracking(true);
  21.     te->installEventFilter(filter);
  22.     mt->setMouseTracking(true);
  23.     mt->installEventFilter(filter);
  24.  
  25.     QVBoxLayout* vl = new QVBoxLayout();
  26.     vl->addWidget(te,0);
  27.     vl->addWidget(mt,1);
  28.     w.setLayout(vl);
  29.     w.show();
  30.  
  31.     QObject::connect(&a, SIGNAL(lastWindowClosed()), &a, SLOT(quit()));
  32.  
  33.     return a.exec();
  34. }
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If you play around with it a bit, you see that, that MouseMoves are filtered on the textedit, but only on the border!!

I guess the main text edit is some subwidget?

Joh

PS: I took the time and figured out how to convert those QEvent::type codes into readable names.
Qt Code: 
  1. QEvent::staticMetaObject.enumerator(QEvent::staticMetaObject.indexOfEnumerator("Type")).valueToKey(event->type());
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