[Qt-interest] Ruler widget not repainting

[Anton Chernov]

> PS: mouseTracking is enabled for all widgets.


Problem:
When this is called it works

void mouseMoveEvent( QMouseEvent* event ) { setCursorPos( event->pos() );
... }


if this it doesn't!
bool eventFilter( QObject* obj, QEvent* event )
{
  if( event->type() == QEvent::MouseMove )
  {
    QMouseEvent* mevent = static_cast( event );
    QWidget* widget = qobject_cast( obj );
    if( widget ) { setCursorPos( mevent->pos() ); }
    ...
}


Arrrrrrgh!

2011/3/21 william.crocker at analog.com <william.crocker at analog.com>

>
>
> Anton Chernov wrote:
> > Hi!
> >
> > Very nervous bug, try already hard for very long time - i am making a
> > ruler widget with showing current cursor position feature and a
> > offseted origin, just like the standard way. The problem is that the
> > current mouse position guids are drawn only when the mouse is over the
> > ruler widget and not when the button is over the widget that i want to
> > "measure" with my ruler.
> >
>
> Is mouse tracking turned on for the measure widget.
>
> Are you ordering update events for the ruler
> widget whenever the mouse moves over the measure widget.
>
> > At first this is my Ruler:
> > class Ruler : public QWidget {
> >  Q_OBJECT
> >   ...
> > public:
> >  void setCursorPos( const QPoint& cursorPos )
> >  {
> >    if( mCursorPos == cursorPos ) { return; }
> >    mCursorPos = cursorPos;
> >    update();
> >  }
> >
> >  bool eventFilter( QObject* obj, QEvent* event )
> >  {
> >    if( event->type() == QEvent::MouseMove )
> >    {
> >      QMouseEvent* mevent = static_cast( event );
> >      QWidget* widget = qobject_cast( obj );
> >      if( widget ) { setCursorPos( mevent->pos() ); }
> >      /* handle mouse events further */
> >      return false;
> >    }
> >    return QWidget::eventFilter( obj, event );
> >  }
> >
> > protected:
> >  void mouseMoveEvent( QMouseEvent* event )
> >  {
> >    setCursorPos( event->pos() );
> >    if( !( event->buttons() | Qt::RightButton ) ) { return; }
> >    QDrag* drag = new QDrag( this );
> >    QMimeData* mimeData = new QMimeData;
> >    drag->setMimeData( mimeData );
> >    drag->start( Qt::MoveAction );
> >  }
> >
> >  void paintEvent( QPaintEvent* )
> >  {
> >     ...
> >     /* mouse guids */ drawMouseGuid( &painter );
> >  }
> >
> >  void drawMouseGuid( QPainter* painter )
> >  {
> >    QPoint start, end;
> >    switch( mOrientation )
> >    {
> >    case Horizontal: { start.rx() = mCursorPos.x(); start.ry() = 0;
> > end.rx() = mCursorPos.x(); end.ry() = rect().height(); } break;
> >    case Vertical: { start.rx() = 0; start.ry() = mCursorPos.y();
> > end.rx() = rect().width(); end.ry() = mCursorPos.y(); } break;
> >    }
> >    painter->save();
> >    QPen pen;
> >    pen.setStyle( Qt::DotLine ); pen.setColor( Qt::black );
> > pen.setWidth( 1 ); painter->setPen( pen ); painter->setOpacity( 0.4 );
> >    painter->drawLine( start, end );
> >    painter->restore();
> >  }
> >
> > I have tried 2 ways:
> >
> > 1. in the widget that holds my ruler and my measurable area i
> > implemented the mouseMoveEvent
> > void Preview::mouseMoveEvent( QMouseEvent* event )
> > {
> >     ui->hRuler->setCursorPos( ui->hRuler->mapFromGlobal(
> event->globalPos() ) );
> >     QWidget::mouseMoveEvent( event );
> > }
> >
> > 2. installed on the widget that i want to measure a event filter
> > ui->previewArea->installEventFilter( ui->hRuler );
> >
> > Neither off them worked. The positions of the cursor seem to be valid
> > and updated, but the ruler widget itself is repainted only when the
> > mouse is over it or by reactivating the application (alt+tab,
> > alt+tab). Please help! :)
> >
> > PS: mouseTracking is enabled for all widgets.
> > _______________________________________________
> > Qt-interest mailing list
> > Qt-interest at qt.nokia.com
> > http://lists.qt.nokia.com/mailman/listinfo/qt-interest
> >
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