interface/wx/sysopt.h

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        sysopt.h
   3 // Purpose:     interface of wxSystemOptions
   4 // Author:      wxWidgets team
   5 // RCS-ID:      $Id$
   6 // Licence:     wxWindows license
   7 /////////////////////////////////////////////////////////////////////////////
   8
   9 /**
  10     @class wxSystemOptions
  11
  12     wxSystemOptions stores option/value pairs that wxWidgets itself or
  13     applications can use to alter behaviour at run-time. It can be
  14     used to optimize behaviour that doesn't deserve a distinct API,
  15     but is still important to be able to configure.
  16
  17     System options can be set by the program itself using SetOption() method
  18     and they also can be set from the program environment by defining an
  19     environment variable @c wx_option to set the given option for all wxWidgets
  20     applications or @c wx_appname_option to set it just for the application
  21     with the given name (as returned by wxApp::GetAppName()). Notice that any
  22     characters not allowed in the environment variables names, such as periods
  23     and dashes, should be replaced with underscores. E.g. to define a system
  24     option "foo-bar" you need to define the environment variable "wx_foo_bar".
  25
  26     The program may use system options for its own needs but they are mostly
  27     used to control the behaviour of wxWidgets library itself.
  28
  29     These options are currently recognised by wxWidgets:
  30
  31     @section sysopt_all All platforms
  32
  33     @beginFlagTable
  34     @flag{exit-on-assert}
  35         If set to non-zero value, abort the program if an assertion fails. The
  36         default behaviour in case of assertion failure depends on the build mode
  37         and can be changed by overriding wxApp::OnAssertFailure() but setting
  38         this option allows to change it without modifying the program code and
  39         also applies to asserts which may happen before the wxApp object
  40         creation or after its destruction.
  41     @endFlagTable
  42
  43     @section sysopt_win Windows
  44
  45     @beginFlagTable
  46     @flag{no-maskblt}
  47         1 to never use WIN32's MaskBlt function, 0 to allow it to be used where possible.
  48         Default: 0. In some circumstances the MaskBlt function can be slower than using
  49         the fallback code, especially if using DC cacheing. By default, MaskBlt will be
  50         used where it is implemented by the operating system and driver.
  51     @flag{msw.remap}
  52         If 1 (the default), wxToolBar bitmap colours will be remapped to the current
  53         theme's values. Set this to 0 to disable this functionality, for example if
  54         you're using more than 16 colours in your tool bitmaps.
  55     @flag{msw.window.no-clip-children}
  56         If 1, windows will not automatically get the WS_CLIPCHILDREN style.
  57         This restores the way windows are refreshed back to the method used in
  58         versions of wxWidgets earlier than 2.5.4, and for some complex window
  59         hierarchies it can reduce apparent refresh delays.
  60         You may still specify wxCLIP_CHILDREN for individual windows.
  61     @flag{msw.notebook.themed-background}
  62         If set to 0, globally disables themed backgrounds on notebook pages.
  63         Note that this won't disable the theme on the actual notebook background
  64         (noticeable only if there are no pages).
  65     @flag{msw.staticbox.optimized-paint}
  66         If set to 0, switches off optimized wxStaticBox painting.
  67         Setting this to 0 causes more flicker, but allows applications to paint
  68         graphics on the parent of a static box (the optimized refresh causes any
  69         such drawing to disappear).
  70     @flag{msw.display.directdraw}
  71         If set to 1, use DirectDraw-based implementation of wxDisplay.
  72         By default the standard Win32 functions are used.
  73     @flag{msw.font.no-proof-quality}
  74         If set to 1, use default fonts quality instead of proof quality when
  75         creating fonts. With proof quality the fonts have slightly better
  76         appearance but not all fonts are available in this quality,
  77         e.g. the Terminal font in small sizes is not and this option may be
  78         used if wider fonts selection is more important than higher quality.
  79     @flag{wince.dialog.real-ok-cancel}
  80         The PocketPC guidelines recommend for Ok/Cancel dialogs to use an OK button
  81         located inside the caption bar and implement Cancel functionality through
  82         Undo outside the dialog.
  83         wxDialog::CreateButtonSizer will follow the native behaviour on WinCE but
  84         it can be overridden with real wxButtons by setting the option below to 1.
  85     @endFlagTable
  86
  87
  88     @section sysopt_gtk GTK+
  89
  90     @beginFlagTable
  91     @flag{gtk.tlw.can-set-transparent}
  92         wxTopLevelWindow::CanSetTransparent() method normally tries to detect
  93         automatically whether transparency for top level windows is currently
  94         supported, however this may sometimes fail and this option allows to
  95         override the automatic detection. Setting it to 1 makes the transparency
  96         be always available (setting it can still fail, of course) and setting it
  97         to 0 makes it always unavailable.
  98     @flag{gtk.desktop}
  99         This option can be set to override the default desktop environment
 100         determination. Supported values are GNOME and KDE.
 101     @flag{gtk.window.force-background-colour}
 102         If 1, the backgrounds of windows with the wxBG_STYLE_COLOUR background
 103         style are cleared forcibly instead of relying on the underlying GTK+
 104         window colour. This works around a display problem when running
 105         applications under KDE with the gtk-qt theme installed (0.6 and below).
 106     @endFlagTable
 107
 108
 109     @section sysopt_mac Mac
 110
 111     @beginFlagTable
 112     @flag{mac.window-plain-transition}
 113         If 1, uses a plainer transition when showing a window.
 114         You can also use the symbol wxMAC_WINDOW_PLAIN_TRANSITION.
 115     @flag{window-default-variant}
 116         The default variant used by windows (cast to integer from the wxWindowVariant enum).
 117         Also known as wxWINDOW_DEFAULT_VARIANT.
 118     @flag{mac.listctrl.always_use_generic}
 119         Tells wxListCtrl to use the generic control even when it is capable of
 120         using the native control instead. Also knwon as wxMAC_ALWAYS_USE_GENERIC_LISTCTRL.
 121     @flag{mac.textcontrol-use-spell-checker}
 122         This option only has effect for Mac OS X 10.4 and higher.
 123         If 1 activates the spell checking in wxTextCtrl.
 124     @endFlagTable
 125
 126
 127     @section sysopt_mgl MGL
 128
 129     @beginFlagTable
 130     @flag{mgl.aa-threshold}
 131         Set this integer option to point size below which fonts are not antialiased. Default: 10.
 132     @flag{mgl.screen-refresh}
 133         Screen refresh rate in Hz. A reasonable default is used if not specified.
 134     @endFlagTable
 135
 136
 137     @section sysopt_motif Motif
 138
 139     @beginFlagTable
 140     @flag{motif.largebuttons}
 141         If 1, uses a bigger default size for wxButtons.
 142     @endFlagTable
 143
 144
 145     The compile-time option to include or exclude this functionality is wxUSE_SYSTEM_OPTIONS.
 146
 147     @library{wxbase}
 148     @category{cfg}
 149
 150     @see wxSystemSettings
 151 */
 152 class wxSystemOptions : public wxObject
 153 {
 154 public:
 155     /**
 156         Default constructor.
 157
 158         You don't need to create an instance of wxSystemOptions since all
 159         of its functions are static.
 160     */
 161     wxSystemOptions();
 162
 163     /**
 164         Gets an option. The function is case-insensitive to @a name.
 165         Returns empty string if the option hasn't been set.
 166
 167         @see SetOption(), GetOptionInt(), HasOption()
 168     */
 169     static wxString GetOption(const wxString& name);
 170
 171     /**
 172         Gets an option as an integer. The function is case-insensitive to @a name.
 173         If the option hasn't been set, this function returns 0.
 174
 175         @see SetOption(), GetOption(), HasOption()
 176     */
 177     static int GetOptionInt(const wxString& name);
 178
 179     /**
 180         Returns @true if the given option is present.
 181         The function is case-insensitive to @a name.
 182
 183         @see SetOption(), GetOption(), GetOptionInt()
 184     */
 185     static bool HasOption(const wxString& name);
 186
 187     /**
 188         Returns @true if the option with the given @a name had been set to 0 value.
 189
 190         This is mostly useful for boolean options for which you can't use
 191         @c GetOptionInt(name) == 0 as this would also be @true if the option
 192         hadn't been set at all.
 193     */
 194     static bool IsFalse(const wxString& name);
 195
 196     //@{
 197     /**
 198         Sets an option. The function is case-insensitive to @a name.
 199     */
 200     void SetOption(const wxString& name, const wxString& value);
 201     void SetOption(const wxString& name, int value);
 202     //@}
 203 };
 204