QDrag ignore cursor icon

[Alundra]

Hi all,
I would have the forbidden cursor if the drop is not possible, here what I do in dragEnter :

if( m_DragActorArray.Empty() )
{
  event->ignore();
  return;
}

if( m_DragActorArray.Empty() )
{
  event->ignore();
  return;
}

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But I don't see the forbidden cursor, why ?
Thanks for the help

[wysota]

Maybe the parent widget accepts the drag? Hard to say without a compilable example reproducing the problem.

[Alundra]

Yes the parent widget accept the drag because inside it can drop but on the target where I ignore it should not.

[wysota]

Try modifying the event object to mark no drop actions are accepted.

[Alundra]

No effects :

if( m_DragActorArray.Empty() )
{
  event->ignore();
  event->setDropAction( Qt::IgnoreAction );
  return;
}

if( m_DragActorArray.Empty() )
{
  event->ignore();
  event->setDropAction( Qt::IgnoreAction );
  return;
}

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The code from the QListView where the drag start :

virtual void startDrag( Qt::DropActions supportedActions )
{
  QDrag* Drag = new QDrag( this );
  Drag->setMimeData( model()->mimeData( selectedIndexes() ) );
  Drag->exec( supportedActions );
}

virtual void startDrag( Qt::DropActions supportedActions )
{
  QDrag* Drag = new QDrag( this );
  Drag->setMimeData( model()->mimeData( selectedIndexes() ) );
  Drag->exec( supportedActions );
}

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The forbidden cursor is showed for all other widget but once it enters the widget this topic is about, the cursor never shows forbidden forever.
The widget uses a QTimer to update from a 3D Engine :

connect( &m_Timer, SIGNAL( timeout() ), this, SLOT( UpdateOneFrame() ) );

connect( &m_Timer, SIGNAL( timeout() ), this, SLOT( UpdateOneFrame() ) );

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void IRenderWidget::UpdateOneFrame()
{
  if( m_Initialized )
  {
    DE::CEngine::GetRenderer().SetRenderWindow( m_RenderWindow );
    OnUpdate();
    DE::CEngine::GetRenderer().EndOfRendering();
    m_RenderWindow->EndFrame();
    m_RenderWindow->StartFrame();
  }
}

void IRenderWidget::UpdateOneFrame()
{
  if( m_Initialized )
  {
    DE::CEngine::GetRenderer().SetRenderWindow( m_RenderWindow );
    OnUpdate();
    DE::CEngine::GetRenderer().EndOfRendering();
    m_RenderWindow->EndFrame();
    m_RenderWindow->StartFrame();
  }
}

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[wysota]

Ok, what exactly is the type of the widget you are trying to block drags for? Are you sure this is not a composed widget where you need to block drags on its viewport?

[Alundra]

The widget I try to block the drag is just a custom widget inherited from QWidget I use to send the 3D engine inside.
All works without crash, just the cursor doesn't shows "forbidden".
I block the drag if no object can be created from drag-and-drop.