Here is a list of user-visible changes in Qt from 1.33 to 1.40.  

Qt 1.40 supports drag and drop, with a simple, platform independent

API. There are eleven new widget classes in 1.40. Asynchronous I/O

support is now in the official Qt API.

Since Qt no longer supports any platforms that only supports 8.3

format file names, the file names of the Qt source and include files

have been made simpler.  #include <qcombobox.h> instead of qcombo.h,

etc.  The old names are still present for compatibility.

The new Qt Xt/Motif Extension allows Qt widgets and applications to

coexist with old Xt/Motif-based applications and widgets.

There are more than one hundred new functions added to existing

classes and, as usual, we fixed some bugs, made some more speedups,

and improved the documentation.

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* 			     New classes				   *

****************************************************************************

* New widgets

  QHeader	- Table header

  QListView	- Multicolun listview/treeview

  QMainWindow	- Application main window

  QScrollView	- Scrolling area (successor of QwViewPort)

  QSpinBox	- Spin button 

  QSplitter	- Paned window

  QStatusBar	- Status bar

  QToolBar	- Container for tool buttons (and other widgets)

  QToolButton	- Fancy push button with auto-raise

  QWhatsThis	- Light weight help system

  QWidgetStack	- Stack of widgets

* Support classes

  QFileIconProvider	- Provides icons for the file dialog

  QIconSet		- Set of icons for different states

  QListViewItem		- Content of a QListView 

  QCheckListItem	- Checkable list view item

* Drag and drop related classes

  QDragObject

  QStoredDrag

  QTextDrag

  QImageDrag

  QDragManager

  QDropSite

* Asynchronous I/O

  QAsyncIO

  QDataPump

  QDataSink

  QDataSource

  QDataStream

  QIODeviceSource

  QImageConsumer

  QImageDecoder

  QImageFormat

  QImageFormatType

* New Events

  QShowEvent 

  QHideEvent 

  QDragMoveEvent 

  QDragEnterEvent

  QDragResponseEvent 

  QDragLeaveEvent 

  QDropEvent 

  QChildEvent 

****************************************************************************

*		       Enhancements from 1.33 to 1.40			   *

****************************************************************************

The file and print dialogs are far better.

Layouts will now automatically readjust if child widgets change 

maximum/minimum sizes, or are deleted.

QFont now supports KOI8R

The reference documentation of the extensions is now integrated with

the main reference documentation in the qt/html directory.

****************************************************************************

*               Changes that might affect runtime behavior                 *

****************************************************************************

None known.

****************************************************************************

*               Changes that might generate compile errors                 *

*                        when compiling old code                           *

****************************************************************************

none

****************************************************************************

*               Type changes that might generate warnings:                 *

****************************************************************************

none

****************************************************************************

* 			Deprecated functions				   *

****************************************************************************

Old function:			Replaced by:

-------------			-----------

QPixmap::isOptimized		QPixmap::optimization

QPixmap::optimize		QPixmap::setOptimization

QPixmap::isGloballyOptimized    QPixmap::defaultOptimization

QPixmap::optimizeGlobally	QPixmap::setDefaultOptimization

****************************************************************************

*      New global functions

****************************************************************************

 bitBlt( QImage* dst, int dx, int dy, const QImage* src,

         int, int, int, int, int conversion_flags );

 bitBlt( QPaintDevice *dst, int, int, const QImage* src,

	 int, int, int, int, int conversion_flags );

****************************************************************************

*      New public/protected functions added to existing classes            *

****************************************************************************

QApplication::sendPostedEvents( QObject *receiver, int event_type ) [static]

QButton::setDown()

QButton::toggle()

QButtonGroup::setButton( int id )

QButtonGroup::buttonToggled( bool on )

QComboBox::setListBox( QListBox * )

QComboBox::listBox() 

QComboBox::setAutoCompletion( bool )

QComboBox::autoCompletion() 

QComboBox::clearEdit()

QComboBox::setEditText( const char * )

QDict::resize()

QDir::drives() [static]

QDir::remove()

QFileDialog::getExistingDirectory() [static]

QFileDialog::setIconProvider() [static]

QFileDialog::iconProvider() [static]

QFileDialog::setSelection( const char* )

QFileDialog::setMode( Mode )

QFileDialog::mode() 

QFileDialog::setFilter( const char * )

QFileDialog::setFilters( const char ** )

QFileDialog::setFilters( const QStrList & )

QFileDialog::addWidgets( QLabel *, QWidget *, QPushButton * ) [protected]

QFont::isCopyOf( const QFont & ) 

QFontMetrics::minLeftBearing() 

QFontMetrics::minRightBearing() 

QFontMetrics::inFont(char)	

QFontMetrics::leftBearing(char) 

QFontMetrics::rightBearing(char) 

QFontMetrics::boundingRect( int x, int y, int w, int h, int flags,

      			    const char *str, int, int, int *, char ** ) 

QFontMetrics::size( int flags, char *str, int, int, int *, char ** ) 

QFrame::margin()

QFrame::setMargin( int )

QGManager::unFreeze()

QGManager::remove( QWidget *w )

QGManager::setName( QChain *, const char * )

QGridLayout::numRows()

QGridLayout::numCols()

QGridLayout::expand( int rows, int cols )

QImage::copy(int x, int y, int w, int h, int conversion_flags=0) 

QImage::copy(QRect&)	

QImage::allGray() 

QImage::isGrayscale() 

QImage::convertDepthWithPalette( int, QRgb* p, int pc, int cf=0 ) 

QImage::smoothScale(int width, int height) 

QImage::loadFromData( QByteArray data, const char *format=0 )

QIntDict::resize()

QLabel::clear()

QLCDNumber::sizeHint() const

QLineEdit::setEnabled( bool )

QLineEdit::setFont( const QFont & )

QLineEdit::setSelection( int, int )

QLineEdit::setCursorPosition( int )

QLineEdit::cursorPosition() const

QLineEdit::validateAndSet( const char *, int, int, int )

QLineEdit::insert( const char * )

QLineEdit::clear()

QLineEdit::repaintArea( int, int ) [protected]

QListBox::setFixedVisibleLines( int lines )

QListBox::sizeHint()

QListBox::ensureCurrentVisible( int )

QMenuData::insertItem( const char *text,

		       const QObject *receiver, const char *member,

		       int accel, int id, int index = -1 )

QMenuData::insertItem( const QPixmap &pixmap,

    		       const QObject *receiver, const char *member,

    		       int accel, int id, int index = -1 )

QMenuData::insertItem( const QPixmap &pixmap, const char *text,

    		       const QObject *receiver, const char *member,

    		       int accel, int id, int index = -1 )

QMenuData::findItem( int id, QMenuData ** parent )

QMovie::QMovie(QDataSource*, int bufsize=1024)

QMultiLineEdit::setFixedVisibleLines( int lines )

QObject::tr( const char * ) 

QObject::name( const char * defaultName )

QPainter::QPainter( const QPaintDevice *, const QWidget * )

QPainter::begin( const QPaintDevice *, const QWidget * )

QPainter::xForm( const QPointArray &, int index, int npoints )

QPainter::xFormDev( const QPointArray &, int index, int npoints )

QPainter::drawImage()

QPainter::drawTiledPixmap()

QPainter::drawPicture( const QPicture & )

QPalette::isCopyOf( const QPalette & )

QPixmap::loadFromData( QByteArray data,

		      const char *,

		      int )

QPixmap::optimization()

QPixmap::setOptimization( Optimization )

QPixmap::defaultOptimization()

QPixmap::setDefaultOptimization( Optimization )

QPopupMenu::exec( const QPoint &, int )

QPopupMenu::aboutToShow()

QPrinter::setPageOrder( PageOrder )

QPrinter::pageOrder() 

QPrinter::setColorMode( ColorMode )

QPrinter::colorMode() 

QPtrDict::resize()

QPushButton::setIsMenuButton( bool )

QPushButton::isMenuButton()

QRegion::QRegion( int x, int y, int w, int h, RegionType = Rectangle )

QRegion::boundingRect() 

QRegion::rects()

QSize::expandedTo()

QSize::boundedTo()

QWidget::isEnabledTo(QWidget*) 

QWidget::isEnabledToTLW() 

QWidget::fontPropagation() 

QWidget::setFontPropagation( PropagationMode )

QWidget::palettePropagation() 

QWidget::setPalettePropagation( PropagationMode )

QWidget::isVisibleTo(QWidget*) 

QWidget::setAcceptDrops( bool on )

QWidget::acceptDrops()

QWidget::focusData() [protected]