# wxAppTraits Class Reference
[Application and System configuration]

`#include </home/work/projects/wx/2.9/wx/interface/wx/apptrait.h>`

## Detailed Description

The wxAppTraits class defines various configurable aspects of a wxApp.

You can access it using wxApp::GetTraits() function and you can create your own wxAppTraits overriding the wxApp::CreateTraits() function.

Note that wxAppTraits is an abstract class since it contains many pure virtual functions. In fact, by default, wxWidgets creates a `wxConsoleAppTraits` object for console applications (i.e. those applications linked against wxBase library only - see the Library List page) and a `wxGUIAppTraits` object for GUI applications. Both these classes are derived by wxAppTraits and represent concrete implementation of the wxAppTraits interface.

##

Library: wxBase
Category: Application and System configuration

See also:
  wxApp Overview, wxApp

## Public Member Functions

virtual wxConfigBase * | CreateConfig ()
| Called by wxWidgets to create the default configuration object for the application.
virtual wxEventLoopBase * | CreateEventLoop ()=0
| Used by wxWidgets to create the main event loop used by wxApp::OnRun().
virtual wxFontMapper * | CreateFontMapper ()=0
| Creates the global font mapper object used for encodings/charset mapping.
virtual wxLog * | CreateLogTarget ()=0
| Creates a wxLog class for the application to use for logging errors.
virtual wxMessageOutput * | CreateMessageOutput ()=0
| Creates the global object used for printing out messages.
virtual wxRendererNative * | CreateRenderer ()=0
| Returns the renderer to use for drawing the generic controls (return value may be NULL in which case the default renderer for the current platform is used); this is used in GUI mode only and always returns NULL in console.
virtual wxString | GetDesktopEnvironment () const =0
| This method returns the name of the desktop environment currently running in a Unix desktop.
virtual wxStandardPathsBase & | GetStandardPaths ()
| Returns the wxStandardPaths object for the application.
virtual wxPortId | GetToolkitVersion (int *major=NULL, int *minor=NULL) const =0
| Returns the wxWidgets port ID used by the running program and eventually fills the given pointers with the values of the major and minor digits of the native toolkit currently used.
virtual bool | HasStderr ()=0
| Returns true if `fprintf(stderr)` goes somewhere, false otherwise.
virtual bool | IsUsingUniversalWidgets () const =0
| Returns true if the library was built as wxUniversal.
virtual bool | ShowAssertDialog (const wxString &msg)=0
| Shows the assert dialog with the specified message in GUI mode or just prints the string to stderr in console mode.

List of all members.

## Member Function Documentation

virtual wxConfigBase* wxAppTraits::CreateConfig | ( |  | ) | `[virtual]`

Called by wxWidgets to create the default configuration object for the application.

The default version creates a registry-based wxRegConfig class under MSW and wxFileConfig under all other platforms.

The wxApp::GetAppName and wxApp::GetVendorName methods are used to determine the registry key or file name.

virtual wxEventLoopBase* wxAppTraits::CreateEventLoop | ( |  | ) | `[pure virtual]`

Used by wxWidgets to create the main event loop used by wxApp::OnRun().

The default implementation of this method in wxGUIAppTraits returns the usual platform-specific GUI event loop. The version in wxConsoleAppTraits returns a console-specific event loop which can be used to handle timer and socket events in console programs under Unix and MSW or NULL under the other platforms where console event loops are not supported yet.

virtual wxFontMapper* wxAppTraits::CreateFontMapper | ( |  | ) | `[pure virtual]`

Creates the global font mapper object used for encodings/charset mapping.

virtual wxLog* wxAppTraits::CreateLogTarget | ( |  | ) | `[pure virtual]`

Creates a wxLog class for the application to use for logging errors.

The default implementation returns a new wxLogGui class.

See also:
  wxLog

virtual wxMessageOutput* wxAppTraits::CreateMessageOutput | ( |  | ) | `[pure virtual]`

Creates the global object used for printing out messages.

virtual wxRendererNative* wxAppTraits::CreateRenderer | ( |  | ) | `[pure virtual]`

Returns the renderer to use for drawing the generic controls (return value may be NULL in which case the default renderer for the current platform is used); this is used in GUI mode only and always returns NULL in console.

Note:
  the returned pointer needs to be deleted by the caller.

virtual wxString wxAppTraits::GetDesktopEnvironment | ( |  | ) | const`[pure virtual]`

This method returns the name of the desktop environment currently running in a Unix desktop.

Currently only "KDE" or "GNOME" are supported and the code uses the X11 session protocol vendor name to figure out, which desktop environment is running. The method returns an empty string otherwise and on all other platforms.

virtual wxStandardPathsBase& wxAppTraits::GetStandardPaths | ( |  | ) | `[virtual]`

Returns the wxStandardPaths object for the application.

It's normally the same for wxBase and wxGUI except in the case of wxMac and wxCocoa.

Note:
  The returned reference is to a `wxStandardPathsBase` class but you can consider it to be equivalent to wxStandardPaths (which is documented).

virtual wxPortId wxAppTraits::GetToolkitVersion | ( | int * | major = `NULL`,
|  | int * | minor = `NULL` |
| ) |  |  | const`[pure virtual]`

Returns the wxWidgets port ID used by the running program and eventually fills the given pointers with the values of the major and minor digits of the native toolkit currently used.

The version numbers returned are thus detected at run-time and not compile-time (except when this is not possible e.g. wxMotif).

E.g. if your program is using wxGTK port this function will return wxPORT_GTK and put in given pointers the versions of the GTK library in use. See wxPlatformInfo for more details.

virtual bool wxAppTraits::HasStderr | ( |  | ) | `[pure virtual]`

Returns true if `fprintf(stderr)` goes somewhere, false otherwise.

virtual bool wxAppTraits::IsUsingUniversalWidgets | ( |  | ) | const`[pure virtual]`

Returns true if the library was built as wxUniversal.

Always returns false for wxBase-only apps.

virtual bool wxAppTraits::ShowAssertDialog | ( | const wxString & | msg | ) | `[pure virtual]`

Shows the assert dialog with the specified message in GUI mode or just prints the string to stderr in console mode.

Returns true to suppress subsequent asserts, false to continue as before.

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