Hi all,
I have a dock widget custom class who use a custom titlebar.
All works fine but when I close the application and one dock is floating, I have a crash.
Without the custom titlebar I have 0 crash, I tried to find but all looks fine to me.
Code :
Qt Code: 
  1. CDockWidget::CDockWidget( const QString& Title, QWidget* Parent ) :
  2. QDockWidget( Title, Parent )
  3. {
  4.   m_Titlebar = new CTitlebarWidget( this );
  5.   setTitleBarWidget( m_Titlebar );
  6.   installEventFilter( this );
  7. }
  8.  
  9. bool CDockWidget::eventFilter( QObject* watched, QEvent* event )
  10. {
  11.   switch( event->type() )
  12.   {
  13.     case QEvent::WindowTitleChange :
  14.     {
  15.       m_Titlebar->SetTitle( windowTitle() );
  16.       return true;
  17.     }
  18.  
  19.     case QEvent::NonClientAreaMouseButtonDblClick :
  20.     {
  21.       if( isMaximized() )
  22.         showNormal();
  23.       else
  24.         showMaximized();
  25.       return true;
  26.     }
  27.   }
  28.   return false;
  29. }
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Qt Code: 
  1. CTitlebarWidget::CTitlebarWidget( QWidget* Parent ) :
  2. QFrame( Parent )
  3. {
  4.   // Set the object name.
  5.   setObjectName( "Titlebar" );
  6.  
  7.   // Connect the dock signal when the floating state change.
  8.   connect( Parent, SIGNAL( topLevelChanged( bool ) ), this, SLOT( ChangeFloatingState( bool ) ) );
  9.  
  10.   // Create the title label.
  11.   m_TitleLabel = new QLabel( Parent->windowTitle() );
  12.   m_TitleLabel->setObjectName( "TitlebarLabel" );
  13.  
  14.   // Minimize button.
  15.   m_MinimizeButton = new QToolButton;
  16.   m_MinimizeButton->setObjectName( "TitlebarMinimizeButton" );
  17.   connect( m_MinimizeButton, SIGNAL( clicked() ), this, SLOT( MinimizeButton() ) );
  18.  
  19.   // Maximize button.
  20.   m_MaximizeButton = new QToolButton;
  21.   m_MaximizeButton->setObjectName( "TitlebarMaximizeButton" );
  22.   connect( m_MaximizeButton, SIGNAL( clicked() ), this, SLOT( ChangeParentMaximizeState() ) );
  23.  
  24.   // Float button.
  25.   m_FloatButton = new QToolButton;
  26.   m_FloatButton->setObjectName( "TitlebarFloatButton" );
  27.   connect( m_FloatButton, SIGNAL( clicked() ), this, SLOT( FloatButton() ) );
  28.  
  29.   // Close button.
  30.   m_CloseButton = new QToolButton;
  31.   m_CloseButton->setObjectName( "TitlebarCloseButton" );
  32.   connect( m_CloseButton, SIGNAL( clicked() ), Parent, SLOT( close() ) );
  33.  
  34.   // Create the control layout.
  35.   QHBoxLayout* ControlLayout = new QHBoxLayout;
  36.   ControlLayout->setMargin( 0 );
  37.   ControlLayout->setSpacing( 0 );
  38.   ControlLayout->addWidget( m_MinimizeButton );
  39.   ControlLayout->addWidget( m_MaximizeButton );
  40.   ControlLayout->addWidget( m_FloatButton );
  41.   ControlLayout->addWidget( m_CloseButton );
  42.  
  43.   // Set the floating state.
  44.   CDockWidget* ParentDock = static_cast< CDockWidget* >( Parent );
  45.   ChangeFloatingState( ParentDock->isFloating() );
  46.  
  47.   // Create the layout.
  48.   QHBoxLayout* Layout = new QHBoxLayout;
  49.   Layout->setMargin( 4 );
  50.   Layout->addWidget( m_TitleLabel );
  51.   Layout->addLayout( ControlLayout );
  52.  
  53.   // Set the layout.
  54.   setLayout( Layout );
  55. }
  56.  
  57. void CTitlebarWidget::SetTitle( const QString& Title )
  58. {
  59.   m_TitleLabel->setText( Title );
  60. }
  61.  
  62. QString CTitlebarWidget::GetTitle() const
  63. {
  64.   return m_TitleLabel->text();
  65. }
  66.  
  67. void CTitlebarWidget::mouseDoubleClickEvent( QMouseEvent* event )
  68. {
  69.   ChangeParentMaximizeState();
  70. }
  71.  
  72. void CTitlebarWidget::mouseMoveEvent( QMouseEvent* event )
  73. {
  74.   // Base class.
  75.   QFrame::mouseMoveEvent( event );
  76.  
  77.   // Check if we move with the left button.
  78.   if( event->buttons() == Qt::MouseButton::LeftButton )
  79.   {
  80.     // Cast the parent.
  81.     CDockWidget* Parent = static_cast< CDockWidget* >( parent() );
  82.  
  83.     // Change parent state.
  84.     if( Parent->isMaximized() )
  85.       Parent->showNormal();
  86.   }
  87. }
  88.  
  89. void CTitlebarWidget::MinimizeButton()
  90. {
  91.   CDockWidget* Parent = static_cast< CDockWidget* >( parent() );
  92.   Parent->setFloating( false );
  93. }
  94.  
  95. void CTitlebarWidget::FloatButton()
  96. {
  97.   CDockWidget* Parent = static_cast< CDockWidget* >( parent() );
  98.   Parent->setFloating( true );
  99. }
  100.  
  101. void CTitlebarWidget::ChangeParentMaximizeState()
  102. {
  103.   // Cast the parent.
  104.   CDockWidget* Parent = static_cast< CDockWidget* >( parent() );
  105.  
  106.   // Change parent state.
  107.   if( Parent->isMaximized() )
  108.     Parent->showNormal();
  109.   else
  110.     Parent->showMaximized();
  111. }
  112.  
  113. void CTitlebarWidget::ChangeFloatingState( bool Floating )
  114. {
  115.   if( Floating )
  116.   {
  117.     m_MinimizeButton->setVisible( true );
  118.     m_MaximizeButton->setVisible( true );
  119.     m_FloatButton->setVisible( false );
  120.   }
  121.   else
  122.   {
  123.     m_MinimizeButton->setVisible( false );
  124.     m_MaximizeButton->setVisible( false );
  125.     m_FloatButton->setVisible( true );
  126.   }
  127. }
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Is it a possible bug of Qt ?
Thanks