1 Qt 2.1 introduces new features as well as many improvements over the
2 2.0.x series. This file will only give an overview of the main changes
3 since version 2.0.2. A complete list would simply be too large to be
4 useful. For more detail see the online documentation which is included
5 in this distribution, and also available on
6 http://qt.nokia.com/doc/
8 The Qt version 2.1 series is binary compatible with the 2.0.x
9 series - applications compiled for 2.0 will continue to run with 2.1.
11 As with previous Qt releases, the API and functionality of Qt is
12 completely portable between Microsoft Windows and X11. It is also portable
13 between Windows 95, 98 and NT; unlike most toolkits, Qt lets a single
14 executable work on all three.
16 ****************************************************************************
18 ****************************************************************************
20 As usual, large sections of the documentation have been revised and
21 lots of new documentation has been added.
23 Much work went into existing classes, based on all the feedback we got
24 from our users. A warm thank you to you all at this point, we honestly
25 hope to satisfy most of your wishes with the new release.
27 Among the things that got a lot of polishing is the new geometry
28 management system that was introduced with the 2.x series. Some
29 classes, such as QBoxLayout, have been rewritten and many size hints
30 and size policies were optimized. As usual with newly introduced
31 systems, the occasional bug has been fixed as well. As a result,
32 layout in Qt-2.1 is not only nicer but also faster.
34 Big parts of the file dialog have been rewritten. It is now
35 synchronized in terms of features with the common Windows dialog,
36 including fancy drag'n'drop and in-place renaming. You can customize
37 both parts of the dialog, the front-end with info and preview widgets,
38 the back-end with different network protocols (see the QFileDialog and
39 QNetworkProtocol documentation for details).
41 Especially interesting for dynamic Qt applications is the newly
42 introduced property system. Many interesting things, from scripting up
43 to graphical user interface builders, become easier. The technology
44 requires a new macro Q_PROPERTY and a new revision of Qt's meta object
45 compiler (moc). See the Qt documentation for details.
47 Due to strong customer demand, we added a cross-platform way to easily
48 implement multi-document interfaces (known as 'MDI'). The widget is
49 called QWorkspace and makes this task trivial.
51 On X11, text dropping from Motif drag'n'drop applications has been
52 added, to make your Qt applications inter-operable with those Motif
53 applications that survived Y2K.
55 The rich text system, first introduced in Qt-2.0, has been
56 revised. Apart from great speed improvements, it now supports HTML
57 tables as well as floating images.
59 QMultiLineEdit, the text input field in Qt, got the missing word wrap
60 functionality. It's probably the last big extension we will add to
61 that widget. In Qt 3.0, it will be replaced by a fancier, faster and
62 more powerful QTextEdit widget that also deals with different colors
63 and fonts in a way similar to the existing QTextView.
65 Qt follows the respective GUI style guides even more closely. This
66 includes honoring desktop settings, and keyboard shortcuts such as
67 Ctrl-Z/Y for undo/redo in line edit and multi-line edit
68 controls. Dialog handling for both modal and non-modal dialogs has
69 been improved to follow the platform conventions precisely.
71 With QIconView, we added a powerful new visualization widget similar
72 to QListView and QListBox. It contains optinally labelled pixmap items
73 that the user can select, drag around, rename, delete and more.
75 Compared to the previous release, we have managed to reduce overall
76 memory consumption while improving execution speed and features.
78 Below is a list of the major new features in existing classes as well
79 as short descriptions of all new classes and the changes in some of
80 the extensions shipped with Qt.
83 ****************************************************************************
84 * New major features in existing classes *
85 ****************************************************************************
87 QApplication - new function wakeUpGuiThread() to simplify using threads
90 QArray - added sorting and binary search.
92 QColor - custom color support added. qRgb(r,g,b) helper function
93 now sets an opaque alpha value instead of a transparent
96 QComboBox - support for text items with icons.
98 QFileDialog - many new features including fancy drag'n'drop
99 and in-place renaming.
100 Methods like setInfoPreviewWidget()and
101 setContentsPreviewWidget() make it easy to customize
102 the dialog extensively. With QUrlOperator and the
103 QNetworkProtocol abstraction, the dialog can operate
104 transparently by various different network protocols,
105 such as HTTP and FTP (see the Network Extension).
107 QFocusEvent - carries a reason() for the event. Possible reasons are
108 Mouse, Tab, ActiveWindow, ShortCut and other. The
109 addition makes line edit controls behave properly.
111 QHeader - added optional visual sort indicator. Revisited API that
112 operates on sections only (solves the 'logical' vs. 'actual'
113 index confusion). A reworked 'table' example shows how
114 to use QHeader in combination with a scrollview to create
115 a simple spreadsheet.
117 QListBox - many signals and functions added for convenience and
120 QListView - various selections modes similar to QListBox, many
121 new functions and signals added for convenience and
124 QMainWindow - implemented draggable and hidable toolbars. A menubar
125 can be made draggable by simply putting it in a toolbar.
127 QMetaObject - Parts of the API made public. The meta object allows
128 applications to access information about an object's
129 properties as well as its signals and slots.
131 QMultiLineEdit - added different word wrap modes: WidgetWidth,
132 FixedPixelWidth and FixedColumnWidth.
134 QObject - property access functions property() and setProperty().
136 QPen - added adjustable cap and join styles.
138 QPopupMenu - added support for tear-off menus, custom items
140 A new function setItemParameter() makes it possible
141 to distinguish between several menu items connected to
144 QPrinter - Now allows printing to the default printer without doing
147 QProgressDialog - auto-reset and auto-close modes.
149 QPushButton - added a menu button mode with setPopup().
151 QScrollView - support for auto-scrolling on drag move events (drag
154 QSignal - optional additional integer parameter for the emitted
157 QSimpleRichText - added adjustSize() function that implements a clever
158 size hint. Vertical break support for printing. inText()
161 QSpinBox - different button symbols, currently UpDownArrows and
164 QSplitter - supports three resize modes now, Stretch, KeepSize
167 QString - new functions setUnicode(), setUnicodeCodes(), setLatin1(),
168 startsWith() and endsWith()
170 QStringList - new functions fromStrList(), split(), join() and grep().
172 QStyle - some extensions for menu button indicators, default
173 button indicators, variable scrollbar extends and toolbar
176 QStyleSheet - a couple of tags added to the default sheet, such as
177 U, NOBR, HEAD, DL, DT, DD and table support (TABLE, TR,
178 TD, TH). Many attributes added to existing tags.
180 QTextView - basic table support. Contents is selectable, selections
181 can be pasted/dragged into other widgets.
183 QToolBar - stretchable depending on the orientation (setHorizontalStretchable()
184 and setVerticalStretchable(). Added orientationChanged() signal.
186 QToolButton - added optional delayed menu with setPopup() and
187 setPopupDelay(). Auto-raise behaviour adjustable.
189 QWidget - new widget flag WStyle_ContextHelp that adds a
190 context-help button to the window titlebar. The
191 button triggers "What's This?"-help. The flag works
192 with MS-Windows and future versions of X11 desktops
195 - New function showFullScreen().
197 - Enabling and disabling with setEnabled() propagates to
200 - Changed isVisible(). It now returns whether a widget
201 is mapped up to the toplevel widget (the previous
202 implementation only returned isVisibleTo(parentWidget()).
204 - New property 'backgroundOrigin' that lets a widget draw
205 its background relatively to its parent widget's coordinate
206 system. This makes pseudo-transparency possible, without
207 the overhead of a real widget mask.
210 ****************************************************************************
212 ****************************************************************************
214 QCustomMenuItem - an abstract base class for custom menu items in
217 QFontDataBase - provides information about the available fonts. Not really
218 a new class (it was used internally for the QFontDialog),
219 but for the first time public API.
221 QGuardedPtr - a template class that provides guarded pointers to
224 QIconView - a sophisticated new widget similar to QListView and
225 QListBox. An iconview contains optinally labelled pixmap
226 items that the user can select, drag around, rename, delete
227 and more. The widget is highly optimized for speed and
228 large amounts of icons.
230 QInputDialog - a convenience dialog to get some simple input values from
233 QMetaProperty - stores meta data about properties. Part of the meta
236 QNetworkProtocol- base class for network protocols, provides
237 a common API for network protocols.
240 QUrlOperator - provides an easy way to work with URLs.
242 QVariant - a tagged union for the most common Qt data types.
244 QValueStack - a value-based stack container.
246 QWorkspace - provides a workspace that can contain decorated
247 windows as opposed to frameless child widgets.
248 QWorkspace makes it easy to implement a multi-document
251 QBig5Codec - provides support for the Big5 Chinese encoding.
254 ****************************************************************************
255 * Changes which may affect runtime behaviour *
256 ****************************************************************************
258 QDataStream / QPicture
259 To accomodate for improved functionality, the stream serialization format
260 of QString and QPen has changed in Qt 2.1. The format version
261 number has been increased to 3. Compatibility has been kept, so
262 applications built with this version of Qt are automatically able to read
263 QDataStream and QPicture data generated by earlier Qt 2.x versions. But if
264 your application needs to generate data that must be readable by
265 applications that are compiled with earlier versions of Qt, you must use
266 QDataStream::setVersion() (if the data contains QString or QPen objects).
267 See the documentation of this function for further discussion.
269 QPainter::drawPolygon()
270 An outline is no longer drawn in the brush color if NoPen is specified.
271 This matches the behaviour on Windows and ensures that the area
272 painted in this case is the same pixels defined by a QRegion made
273 from the polygon. To get the old behaviour, you can call
274 painter.setPen(painter.brush()) prior to painting, which will also
277 QPushButton::sizeHint()
278 The size hint of auto-default push buttons has been slightly
279 increased in order to reserve space for a default button indicator
280 frame. This is necessary for a proper Motif or Platinum emulation. If
281 this change destroys your geometry management, a auto-default button
282 is probably not what you wanted anyway. Simply call
283 setAutoDefault(FALSE) on these push buttons to get the old behaviour.
286 Font and palette propagation has changed totally (from "almost
287 brain-dead" to working). In practice, the only changes we've seen are
291 qRgb(r,g,b) now sets a default opaque alpha value of 0xff instead of
292 a transparent 0x00 alpha value formerly. Use qRgb(r,g,b,a) if you do
293 need a transparent alpha value.
296 It turned out that the old normal/active/disabled set of color groups
297 didn't work very well, except in the simplest hello-world examples,
298 that it couldn't be fixed without nasty hacks, and that during five
299 years nobody had discovered the bugs. So, we've dropped our broken
300 attempt at Tcl/Tk L&F compatibility, and added support for Windows
301 2000 and Macintosh L&F compatibility instead. The Macintosh and
302 Windows 2000 looks differentiate between the window with focus and
303 other windows. Qt calls the color groups QPalette::active() and
304 QPalette::inactive() respectively.
306 QGridLayout/QBoxLayout
307 setMargin() now also works on child layouts. As a result of this
308 change, the geometry() of a layout now includes margin(). This may
309 effect programs that use QLayout::geometry().
312 The now adjustable auto-raise behaviour defaults to TRUE only when
313 a button is used inside a QToolBar. That's usually what you want. If not,
314 call setAutoRaise(FALSE).