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  36 <H2 CLASS="western">The Wonderful World of wxWidgets 3.0</H2>
  37 <H3 CLASS="western">What is wxWidgets?</H3>
  38 <P ALIGN=JUSTIFY>Although it is quite unlikely that you'll read this
  39 document if you don't know what wxWidgets is, let's just briefly
  40 mention that wxWidgets is a C++ framework for building rich GUI
  41 applications from a single source which can then be compiled on
  42 different operating systems, resulting in a native application on
  43 each system. wxWidgets uses native controls (or widgets) and other
  44 native functions whereever possible so that the resulting
  45 applications will look and feel as native as possible, and they are
  46 usually not distinguishable from applications written using single
  47 platform toolkits such as MFC for Windows, GTK+ for Linux or Cocoa
  48 under OS X. In some areas (such as graphics art or the installer),
  49 adaptations to the individual platforms have to be made in order to
  50 achieve perfect integration with that platform.</P>
  51 <P ALIGN=JUSTIFY>The major operating system for which wxWidgets
  52 supports are Windows (Windows 95, NT, 2000, XP, Vista) including its
  53 mobile variants (Windows CE, PocketPC, Windows Mobile), Linux and
  54 Unix using the GTK+ 2 toolkit (minimum version is GTK+ 2.4, more
  55 recent features are used when available) and Mac OS X (minimum
  56 version 10.4 Tiger, both Intel, PPC and the Universal Binaries for
  57 both are supported). wxWidgets includes many code pieces for
  58 optimising dialog and general layout for small screens such as those
  59 of the recent netbooks and mobile phones and tablets.</P>
  60 <P ALIGN=JUSTIFY>There is varying support for other platforms or
  61 toolkits such as OS/2, Motif, GTK 1.2, PalmOS and various mobile
  62 Linux variants using GTK+ or the Hildon framework and also a version
  63 for OS X using the Cocoa API and even the iPhone SDK.</P>
  64 <H3 CLASS="western">Documentation in Doxygen</H3>
  65 <P ALIGN=JUSTIFY STYLE="margin-bottom: 0cm">Until wxWidgets 3.0 all
  66 documentation was written in a customized LaTeX variant created for
  67 the project years ago. Although there were tools which could parse
  68 classes automatically and create a documentation skeleton, class
  69 documentation was troublesome to update and therefore often outdated.
  70 In order to improve this situation, the entire documentation
  71 including references and overviews was converted to a customized
  72 Doxygen format inlined in a special set of headers. Although many
  73 classes were converted in a single automated step, every class
  74 documentation had to be corrected by hand making this effort one of
  75 the biggest in the development cycle leading up wxWidgets 3.0.
  76 Additionally, tools were written to automatically compare the
  77 signature of the many class methods to the documentation. The result
  78 is more correct documentation with better formating and built-in
  79 searching and screenshots of many controls. Since Doxygen is a
  80 wide-spread format and easy to learn, the new documentation is much
  81 easier to edit, correct and read. See the <A HREF="http://docs.wxwidgets.org/trunk/index.html">wxWidgets
  82 on-line documentation</A> to which this document refers to in many
  83 places.</P>
  84 <H3 CLASS="western">C++ features and template support</H3>
  85 <P ALIGN=JUSTIFY STYLE="margin-bottom: 0cm">The wxWidgets project
  86 tries to both move with new developments of the C++ language as well
  87 as to support older compilers to an extent which does not inhibit
  88 further development and indeed the usefulness of the entire project.
  89 Since support for templates used to be limited to a few compilers and
  90 was often buggy even in them, wxWidgets initially stayed away from
  91 using templates entirely including the use of the Standard Template
  92 Library (STL). In the meantime nearly all compilers have gained solid
  93 template support and therefore wxWidgets is now using templates for
  94 container classes (such as <A HREF="http://docs.wxwidgets.org/trunk/classwx_vector_3_01_t_01_4.html">wxVector&lt;T&gt;</A>),
  95 smart pointers (such as <A HREF="http://docs.wxwidgets.org/trunk/classwx_shared_ptr_3_01_t_01_4.html">wxSharedPtr&lt;T&gt;</A>),
  96 weak references (see <A HREF="http://docs.wxwidgets.org/trunk/classwx_weak_ref_3_01_t_01_4.html">wxWeakRef&lt;T&gt;</A>)
  97 and many other places where templates are useful. This means that
  98 very old compilers won't be able to compile wxWidgets anymore or only
  99 in a degraded way (such as Visual C++ 6.0).</P>
 100 <H3 CLASS="western">Platform features and backwards compatibility</H3>
 101 <P ALIGN=JUSTIFY STYLE="margin-bottom: 0cm">In the same way wxWidgets
 102 tries to both make use of new features of the different operating
 103 systems and support older systems for as long as possible and as long
 104 as supporting them does not hinder development for up-to-date
 105 systems. This is especially true for OS X and GTK+ 2 and it was
 106 therefore decided that OS X versions older than 10.4 Tiger and GTK+ 2
 107 version older than 2.4 are no longer supported. The wxWidgets team
 108 also realized that it could not do everything and that support for a
 109 cross-platform database API was beyond the scope and focus of the
 110 project so that its old wxODBC database connectivity classes were
 111 removed from the project. There are many cross-platform database
 112 libraries available and many of them are better than the old wxODBC
 113 and all of them are better maintained.</P>
 114 <H3 CLASS="western">Unicode: A Single Build for Everyone</H3>
 115 <P ALIGN=JUSTIFY STYLE="margin-bottom: 0cm">Until version 3.0 there
 116 have always been two different versions (or builds) of wxWidgets: one
 117 with full support for Unicode where each character was represented by
 118 a wchar_t internally (using two bytes under Windows and four bytes
 119 almost everywhere else) and another called the „ANSI“ build where
 120 each character was represented by a single byte. This model was
 121 chosen following the original Windows API model and at a point of
 122 time when Unicode support was hardly present anywhere else. In the
 123 meantime, the Windows world together with projects such as Java have
 124 chosen UTF-16 as the native representation for Unicode strings
 125 whereas much of the free software world including GTK+ and parts of
 126 Mac OS X have chosen UTF-8. It was therefore decided to drastically
 127 change the implementation of wxWidgets' string class and make it use
 128 UTF-16 under Windows (mostly as before) but UTF-8 elsewhere (instead
 129 of wide character strings using wchar_t) so that strings received
 130 from and sent to Unix and GTK+ library calls would no longer have to
 131 be converted back and forth between different Unicode representations
 132 (see <A HREF="http://docs.wxwidgets.org/trunk/classwx_string.html">wxString</A>
 133 and <A HREF="http://docs.wxwidgets.org/trunk/overview_unicode.html">Unicode
 134 overview</A>). Additionally, the „ANSI“ mode was removed and the
 135 wxString class as well as some other classes were modified to accept
 136 and return both Unicode and 8-bit string literals if required. The
 137 same was done to functions like wxPrintf() etc. Although this change
 138 will eventually not be seen by the end user of an application written
 139 using wxWidgets, it is such a fundamental change that it was the
 140 primary reason to give wxWidgets the new major version number 3.</P>
 141 <H3 CLASS="western">New 2D Drawing Code</H3>
 142 <P ALIGN=JUSTIFY STYLE="margin-bottom: 0cm">Although a 2D drawing API
 143 has always been part of wxWidgets (using so-called device contexts
 144 such as a window or a bitmap and pens and brushes to draw into them,
 145 see <A HREF="http://docs.wxwidgets.org/trunk/classwx_d_c.html">wxDC</A>,
 146 <A HREF="http://docs.wxwidgets.org/trunk/classwx_pen.html">wxPen</A>,
 147 <A HREF="http://docs.wxwidgets.org/trunk/classwx_brush.html">wxBrush</A>),
 148 it has not changed much since its initial inception and so the code
 149 was completely reorganized using a single set of frontend classes and
 150 different backends which will make maintainance much easier without
 151 having to care for binary backwards compatibility and it also helped
 152 isolate a number of subtle platform differences. The old drawing API
 153 is good enough for many tasks and reflects the drawing capabilites of
 154 the 1990's but it didn't make use of advanced features such as
 155 transparency, anti-aliasing and free matrix transforms of modern 2D
 156 graphics systems such as GDI+ on Windows, Cairo on Linux (and
 157 elsewhere) and CoreGraphics on OS X. Therefore a completely new
 158 drawing API (the so called graphics contexts, see <A HREF="http://docs.wxwidgets.org/trunk/classwx_graphics_context.html">wxGraphicsContext</A>)
 159 was added to wxWidgets making use of modern drawing engines. This is
 160 complemented by a bitmap class with alpha channel support and fast
 161 raw access to the bitmap's internal data representation. Additionally
 162 the API of all existing GDI class constants was corrected so that
 163 wxMODERN becomes wxFONTFAMILY_MODERN, wxSOLID becomes
 164 wxBRUSHSTYLE_SOLID etc. and the reference counting system was
 165 streamlined and made identical on all platforms.</P>
 166 <H3 CLASS="western">Changes to wxBase</H3>
 167 <P ALIGN=JUSTIFY>wxBase is the name of the non-GUI part of wxWidgets
 168 libary which provides basic class such as the aforementioned wxString
 169 class, container classes, as well as classes for threading,
 170 networking, XML parsing, path and configuration management, logging,
 171 debugging etc. These functions and classes have been separated into
 172 their own library both for being able to write non-GUI apps as well
 173 as to make maintainance easier through reduced interdependence.
 174 </P>
 175 <P ALIGN=JUSTIFY>Many of the changes to wxString and the container
 176 classes are located in wxBase, but on top of that support to wxBase
 177 was added for events loops, timers and sockets for writing
 178 event-based client or server apps with wxWidgets 3.0. The socket code
 179 itself has been reorganized removing a lot of duplicated code and
 180 dropping the previous implementation which was separated into a C and
 181 a C++ part.</P>
 182 <H3 CLASS="western">New controls and other major GUI additions for
 183 all ports</H3>
 184 <P ALIGN=JUSTIFY>This document cannot list every bug fix and minor
 185 change. Rather, this paragraph summarizes the most relevant changes
 186 to the GUI classes of wxWidgets. Given wxWidgets' nature as a GUI
 187 library, these changes are also most likely to be visible to the user
 188 and may thus be the most important changes from a user's perspective
 189 (although not necessarily from a developer's perspective):
 190 </P>
 191 <UL>
 192         <LI><P ALIGN=JUSTIFY>wxDataViewCtrl and wxDataViewTreeCtrl: this
 193         control can partially replace both wxListCtrl and wxTreeCtrl (for
 194         which there only was a native version of Windows and partially for
 195         OS X) but also extends and combines the classes by being able to
 196         display a hierarchy and list at the same time and by offering a much
 197         more flexible way to display and edit data on a per column basis.
 198         Reimplementing wxTreeCtrl and possibly wxListCtrl in terms of
 199         wxDataViewCtrl was considered, but this was dropped as certain
 200         special features are not available on all platforms (or
 201         differently). See also <A HREF="http://docs.wxwidgets.org/trunk/classwx_data_view_ctrl.html">wxDataViewCtrl</A>,
 202         <A HREF="http://docs.wxwidgets.org/trunk/classwx_data_view_list_ctrl.html">wxDataViewListCtrl</A>
 203         and <A HREF="http://docs.wxwidgets.org/trunk/classwx_data_view_tree_ctrl.html">wxDataViewTreeCtrl</A>.</P>
 204         <LI><P ALIGN=JUSTIFY>The tabular view of wxGrid has been improved
 205         including a native header control, which has been separated into a
 206         new control. See also <A HREF="http://docs.wxwidgets.org/trunk/classwx_grid.html">wxGrid</A>
 207         and <A HREF="http://docs.wxwidgets.org/trunk/classwx_header_ctrl.html">wxHeaderCtrl.</A></P>
 208         <LI><P ALIGN=JUSTIFY>Added wxPropertyGrid which is a big generic
 209         control used to display lists and hierarchies of name-value pairs.
 210         Like wxDataViewCtrl, it offers a number of ready-to-use editors for
 211         editing text, numbers, lists, fonts, file names etc. using in-place
 212         editing or using pop-up dialog and combo boxes. Developement of
 213         wxPropertyGrid has so far taken place outside of wxWidgets as a
 214         separate project, but it has not been included in wxWidgets per se.
 215         See also <A HREF="http://docs.wxwidgets.org/trunk/classwx_property_grid.html">wxPropertyGrid</A>.</P>
 216         <LI><P ALIGN=JUSTIFY>wxHyperlinkCtrl added, implemented natively
 217         under GTK+ and in a generic way on other platforms. It can be used
 218         to represent a hypertext link, for example to the homepage of the
 219         developer or company. See also <A HREF="http://docs.wxwidgets.org/trunk/classwx_hyperlink_ctrl.html">wxHyperlinkCtrl</A>.</P>
 220         <LI><P ALIGN=JUSTIFY>wxFileCtrl for constructing fully customized
 221         file dialogs. Complementary to this, the possibility to add custom
 222         control to wxFileDialog has been added. See <A HREF="http://docs.wxwidgets.org/trunk/classwx_file_ctrl.html">wxFileCtrl</A>
 223         and <A HREF="http://docs.wxwidgets.org/trunk/classwx_file_dialog.html">wxFileDialog</A>.</P>
 224         <LI><P ALIGN=JUSTIFY>Several enhancements to wxRichTextCtrl
 225         including support for super- and subscript and many speed-ups. See
 226         <A HREF="http://docs.wxwidgets.org/trunk/classwx_rich_text_ctrl.html">wxRichTextCtrl</A>.</P>
 227         <LI><P ALIGN=JUSTIFY>The possibility to display state icons has been
 228         added to wxTreeCtrl. This can also be used to implement check-box
 229         like behaviour. See <A HREF="http://docs.wxwidgets.org/trunk/classwx_tree_ctrl.html">wxTreeCtrl</A>.</P>
 230         <LI><P ALIGN=JUSTIFY>wxCalendarCtrl has been rewritten using native
 231         code under MSW and GTK+ and enhanced in many ways (for example
 232         displaying week numbers). See <A HREF="http://docs.wxwidgets.org/trunk/classwx_calendar_ctrl.html">wxCalendarCtrl</A>.</P>
 233         <LI><P ALIGN=JUSTIFY>Implemented support for auto-completion for
 234         wxTextCtrl and wxComboBox.</P>
 235         <LI><P ALIGN=JUSTIFY>Added wxAUIToolBar to the set of wxAUI classes,
 236         which is better integrated and more flexible than the standard
 237         wxToolBar.</P>
 238         <LI><P ALIGN=JUSTIFY>Reimplemented wxBitmapComboBox using native
 239         code under MSW and GTK+. See also <A HREF="http://docs.wxwidgets.org/trunk/classwx_bitmap_combo_box.html">wxBitmapComboBox</A>.</P>
 240         <LI><P ALIGN=JUSTIFY>Added wxBitmapToggleButton on all platforms.
 241         See also <A HREF="http://docs.wxwidgets.org/trunk/classwx_bitmap_toggle_button.html">wxBitmapToggleButton</A>.</P>
 242         <LI><P ALIGN=JUSTIFY>Added support for ellipsization on all
 243         platforms and for mark-up formatting under GTK+ to wxStaticText. See
 244         <A HREF="http://docs.wxwidgets.org/trunk/classwx_static_text.html">wxStaticText</A>.</P>
 245         <LI><P ALIGN=JUSTIFY>Rewritten the selection event emission logic of
 246         wxListBox on all platforms to more exactly match each other when
 247         selecting and deselecting certain items.</P>
 248         <LI><P ALIGN=JUSTIFY>Implemented wxCollapsiblePane natively for GTK
 249         and OS X. See <A HREF="http://docs.wxwidgets.org/trunk/classwx_collapsible_pane.html">wxCollapsiblePane</A>.</P>
 250         <LI><P ALIGN=JUSTIFY>Added a new sizer which can wrap across
 251         multiple lines. See <A HREF="http://docs.wxwidgets.org/trunk/classwx_wrap_sizer.html">wxWrapSizer</A>.</P>
 252         <LI><P ALIGN=JUSTIFY>Added multi-sample and anti-aliasing support
 253         the the OpenGL canvas and separated wxGLCanvas and wxGLContext. See
 254         <A HREF="http://docs.wxwidgets.org/trunk/classwx_g_l_canvas.html">wxGLCanvas</A>.</P>
 255         <LI><P ALIGN=JUSTIFY>Added wxNativeContainerWindow in order to
 256         construct a wxTopLevelWindow from a native window handle (MSW and
 257         GTK+).</P>
 258         <LI><P ALIGN=JUSTIFY>The <A HREF="http://docs.wxwidgets.org/trunk/classwx_v_scrolled_window.html">wxVScrolledWindow</A>
 259         class has been completely rewritten to accommodate the addition of
 260         the new horizontal scrolling variants (<A HREF="http://docs.wxwidgets.org/trunk/classwx_h_scrolled_window.html">wxHScrolledWindow</A>
 261         and <A HREF="http://docs.wxwidgets.org/trunk/classwx_h_v_scrolled_window.html">wxHVScrolledWindow</A>)
 262         while still providing complete backwards compatibility for
 263         wxVScrolledWindow.</P>
 264 </UL>
 265 <H3 CLASS="western">wxMac specific changes (now called wxOSX)</H3>
 266 <P ALIGN=JUSTIFY>One important change of the wxMac port is that the
 267 port is not called wxMac anymore. Instead, the more appropriate term
 268 wxOSX should be used as the operating system is called OS X nowadays
 269 and – more importantly – wxWidgets now has partial support for
 270 iPhone and iPod, and these are devices are clearly not Macs. Apart
 271 from the name change – wxMac has undergone the most fundamental
 272 changes of the three main ports, even if some of the changes were
 273 mostly reorganizing code instead of writing new code. The code has
 274 been reorganized into common code (common to Carbon, Cocoa and Cocoa
 275 Touch) including both general wrapping or front-end classes for much
 276 of the GUI code as well as a wrapper for the so called CoreFoundation
 277 classes of OS X, which are responsible on all OS X variants for
 278 string manipulation, font support, graphics and other basic
 279 functionality (CoreImage and CoreVideo have recently been added by
 280 Apple) and toolkit dependent code for the Carbon, Cocoa and Cocoa
 281 Touch API. The Carbon variant is the core of what used to be wxMac
 282 and is the most stable and mature version. The reason behind adding
 283 optional support for Cocoa and Cocoa Touch is that Carbon is not
 284 available on iPhones at all and that it has been deprecated for all
 285 64-bit versions of OS X, which is likely to be the default a few
 286 years from now. So while present applications using wxOSX are advised
 287 to use the Carbon backend due its maturity, future developement will
 288 have to focus on the Cocoa backend.</P>
 289 <P ALIGN=JUSTIFY>As part of the restructuring, all remaining drawing
 290 code using the old QuickDraw API has been removed (it was only an
 291 option before) and drawing now always takes place using CoreGraphics.
 292 Likewise, all code using Carbon functions no longer present in OS X
 293 10.4 has been removed to clean-up the code greatly. This is turn
 294 means, as mentioned above, that applications will require a minimum
 295 of OS X 10.4 in order to run, better yet OS X 10.5.</P>
 296 <P ALIGN=JUSTIFY>Apart from these large changes, these additional
 297 features can be noted:</P>
 298 <UL>
 299         <LI><P ALIGN=JUSTIFY>Better support for IconRef</P>
 300         <LI><P ALIGN=JUSTIFY>A fix for duplicate menu entries in non-English
 301         locales</P>
 302         <LI><P ALIGN=JUSTIFY>Accelerators allowed to be used for buttons</P>
 303         <LI><P ALIGN=JUSTIFY>wxLocale::GetInfo() implemented using CFLocale</P>
 304 </UL>
 305 <H3 CLASS="western">wxGTK specific changes</H3>
 306 <P ALIGN=JUSTIFY STYLE="margin-bottom: 0cm">The task of the GTK+ port
 307 of wxWidgets is to keep up with the development of the GTK+ library
 308 since it has the habit of adding new controls or new APIs if the
 309 existing code is too limited and cannot be fixed in a backward
 310 compatible way. The main problem of this approach is that
 311 applications written using wxGTK should work with relatively old
 312 versions of GTK+ but should also make use of recent features. In some
 313 cases, supporting an old version of GTK+ hinders development so we
 314 decided to declare GTK+ 2.4 the minimum toolkit version that is
 315 supported. As an example, this made it possible to always use the
 316 GTK+ file dialog instead of the old generic file dialog which had to
 317 be used when GTK+ didn't have a usable file dialog.
 318 </P>
 319 <P ALIGN=JUSTIFY STYLE="margin-bottom: 0cm">Other parts of wxGTK that
 320 were rewritten or which underwent a major update include, but are not
 321 limited to:</P>
 322 <UL>
 323         <LI><P ALIGN=JUSTIFY STYLE="margin-bottom: 0cm">wxToolbar now uses
 324         the „new“ GTK+ toolbar API</P>
 325         <LI><P ALIGN=JUSTIFY STYLE="margin-bottom: 0cm">wxChoice now uses
 326         GtkComboBox instead of the deprecated GtkOptionMenu</P>
 327         <LI><P ALIGN=JUSTIFY STYLE="margin-bottom: 0cm">wxComboBox now
 328         always uses GtkComboBox instead of the deprecated GtkCombo class</P>
 329         <LI><P ALIGN=JUSTIFY STYLE="margin-bottom: 0cm">URL dragging using
 330         the „text/x-moz-url“ in wxURLDataObject</P>
 331         <LI><P ALIGN=JUSTIFY STYLE="margin-bottom: 0cm">Added a completely
 332         new printing backend using with dialogs GtkPrint and Cairo</P>
 333         <LI><P ALIGN=JUSTIFY STYLE="margin-bottom: 0cm">Rewritten idle event
 334         generation code</P>
 335         <LI><P ALIGN=JUSTIFY STYLE="margin-bottom: 0cm">Tab traversal is now
 336         done natively by GTK+ instead of by wxWidgets</P>
 337         <LI><P ALIGN=JUSTIFY STYLE="margin-bottom: 0cm">Rewrote layout of
 338         wxFrame's menubar, toolbar, client window and statusbar using a
 339         GtkVBox instead of our own calculation</P>
 340         <LI><P ALIGN=JUSTIFY STYLE="margin-bottom: 0cm">Correctly
 341         implemented SetSize() and GetSize() for toplevel windows in spite of
 342         the dreaded problems with window decorations belonging to the Window
 343         Manager and not the window itself</P>
 344         <LI><P ALIGN=JUSTIFY STYLE="margin-bottom: 0cm">Added an
 345         asynchronous API to wxClipboard to avoid having to call wxYield()
 346         from within it (which causes reentrance problems).</P>
 347         <LI><P ALIGN=JUSTIFY STYLE="margin-bottom: 0cm">Some support for
 348         Hildon control from the Maemo platform used for Nokia tablets</P>
 349         <LI><P ALIGN=JUSTIFY STYLE="margin-bottom: 0cm">Rewritten the
 350         wxTaskBarIconIcon class using GtkStatusIcon if available.</P>
 351 </UL>
 352 <P ALIGN=JUSTIFY STYLE="margin-bottom: 0cm"><BR>
 353 </P>
 354 <H3 CLASS="western">wxMSW specific changes</H3>
 355 <P STYLE="margin-bottom: 0cm">wxMSW is the most mature platform,
 356 mostly because it is used most often and thus has the biggest user,
 357 tester and developer base, but also because the underlying Windows
 358 system has been more successful at preserving backwards
 359 compatibility. Therefore, the list of wxMSW-specific changes is
 360 smaller and the changes usually minor details when compared to the
 361 changes of the other two main ports:</P>
 362 <UL>
 363         <LI><P STYLE="margin-bottom: 0cm">Implemented more native looking
 364         wxCheckListBox and add ability to store client data in it</P>
 365         <LI><P STYLE="margin-bottom: 0cm">Allow longer tooltips</P>
 366         <LI><P STYLE="margin-bottom: 0cm">Support for multiline labels in
 367         wxCheckBox and wxToggleButton</P>
 368         <LI><P STYLE="margin-bottom: 0cm">More precise print preview</P>
 369         <LI><P STYLE="margin-bottom: 0cm">Show resize gripper in resizable
 370         dialogs</P>
 371 </UL>
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 373 </P>
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