gtk2/docs/reference/gtk/tmpl/gtkrc.sgml

<!-- ##### SECTION Title ##### -->
Resource Files

<!-- ##### SECTION Short_Description ##### -->
Routines for handling resource files

<!-- ##### SECTION Long_Description ##### -->
<para>
GTK+ provides resource file mechanism for configuring
various aspects of the operation of a GTK+ program
at runtime.
</para>

<refsect2><title>Default files</title>
<para>
An application can cause GTK+ to parse a specific RC
file by calling gtk_rc_parse(). In addition to this,
certain files will be read at the end of gtk_init().
Unless modified, the files looked for will be <filename>.gtkrc</filename>
in the users home directory, and 
<filename>$localstatedir/gtk/gtkrc</filename> 
(<literal>$localstatedir</literal> defaults to 
<filename>/usr/local/etc</filename>).
</para>
<para>
The set of these <firstterm>default</firstterm> files
can be retrieved with gtk_rc_get_default_files()
and modified with gtk_rc_add_default_file() and
gtk_rc_set_default_files().
</para>
<para>
For each default file, in addition to the file itself,
GTK+ will look for a locale-specific file that will
be parsed in addition to the main file. For instance,
if <literal>LANG</literal> is set to <literal>ja_JP.ujis</literal>,
when loading the default file <filename>~/.gtkrc</filename>
then GTK+ looks for <filename>~/.gtkrc.ja_JP.ujis</filename>,
<filename>~/.gtkrc.ja_JP</filename>, and
<filename>~/.gtkrc.ja</filename>, and parses the
first one it finds.
</para>
</refsect2>

<refsect2><title>Pathnames and patterns</title>
<para>
A resource file defines a number of styles and key bindings and
attaches them to particular widgets. The attachment is done
by the <literal>widget</literal>, <literal>widget_class</literal>,
and <literal>class</literal> declarations. As an example
of such a statement:
<programlisting>
widget "mywindow.*.GtkEntry" style "my-entry-class"
</programlisting>
attaches the style <literal>"my-entry-class"</literal>
to all widgets whose <firstterm>widget class</firstterm>
matches the <firstterm>pattern</firstterm>
<literal>"mywindow.*.GtkEntry"</literal>.
</para>
<para>
The patterns here are given in the standard shell glob
syntax. The <literal>"?"</literal> wildcard matches
any character, while <literal>"*"</literal> matches
zero or more of any character. The three types of
matching are against the widget path, the
<firstterm>class path</firstterm> and the class
heirarchy. Both the widget and the class paths consists of a
<literal>"."</literal> separated list of all the
parents of the widget and the widget itself from
outermost to innermost. The difference is that in
the widget path, the name assigned by
<function>gtk_widget_set_name()</function> is used
if present, otherwise the class name of the widget, while
for the widget path, the class name is always used.
</para>
<para>
So, if you have a <classname>GtkEntry</classname> named
<literal>"myentry"</literal>, inside of a of a window
named <literal>"mywindow"</literal>, then the
widget path is:
<programlisting>
"mwindow.GtkHBox.myentry"
</programlisting>
while the class path is:
<programlisting>
"GtkWindow.GtkHBox.GtkEntry"
</programlisting>
</para>
<para>
Matching against class is a little different. The pattern
match is done against all class names in the widgets
class heirarchy (not the layout heirarchy) in sequence, so the
pattern:
<programlisting>
class "GtkButton" style "my-style"
</programlisting>
will match not just <classname>GtkButton</classname> widgets,
but also <classname>GtkToggleButton</classname> and
<classname>GtkCheckButton</classname> widgets, since
those classes derive from <classname>GtkButton</classname>.
</para>
</refsect2>

<refsect2><title>Toplevel declarations</title>
<para>
An RC file is a text file which is composed of a sequence
of declarations. '#' characters delimit comments and
the portion of a line after a '#' is ignored when parsing
an RC file.
</para>

<para>
The possible toplevel declarations are:

<variablelist>
  <varlistentry>
    <term><literal>binding <replaceable>name</replaceable>
     { ... }</literal></term>
    <listitem>
      <para>Declare a binding set</para>
    </listitem>
  </varlistentry>
  <varlistentry>
    <term><literal>class <replaceable>pattern</replaceable> 
          [ style | binding [ : <replaceable>priority</replaceable> ]]
          <replaceable>name</replaceable></literal></term>
    <listitem>
     <para>Specify a style or binding set for a particular
     branch of the inheritance heirarchy.</para>
    </listitem>
  </varlistentry>
  <varlistentry>
    <term><literal>include <replaceable>filename</replaceable></literal></term>
    <listitem>
      <para>Parse another file at this point</para>
    </listitem>
  </varlistentry>
  <varlistentry>
    <term><literal>module_path <replaceable>path></replaceable></literal></term>
    <listitem>
      <para>Sets a path (a list of directories separated
      by colons) that will be searched for theme engines referenced in
      RC files.</para>
    </listitem>
  </varlistentry>
  <varlistentry>
    <term><literal>pixmap_path <replaceable>path></replaceable></literal></term>
    <listitem>
      <para>Sets a path (a list of directories separated
      by colons) that will be searched for pixmaps referenced in
      RC files.</para>
    </listitem>
  </varlistentry>
  <varlistentry>
    <term><literal>style <replaceable>name</replaceable> [ =
    <replaceable>parent</replaceable> ] { ... }</literal></term>
    <listitem>
      <para>Declare a style</para>
    </listitem>
  </varlistentry>
  <varlistentry>
    <term><literal>widget <replaceable>pattern</replaceable> 
          [ style | binding [ : <replaceable>priority</replaceable> ]]
          <replaceable>name</replaceable></literal></term>
    <listitem>
     <para>Specify a style or binding set for a particular
     group of widgets by matching on the widget pathname.</para>
    </listitem>
  </varlistentry>
  <varlistentry>
    <term><literal>widget_class <replaceable>pattern</replaceable> 
          [ style | binding [ : <replaceable>priority</replaceable> ]]
          <replaceable>name</replaceable></literal></term>
    <listitem>
     <para>Specify a style or binding set for a particular
     group of widgets by matching on the class pathname.</para>
    </listitem>
  </varlistentry>
</variablelist>
</para>
</refsect2>

<refsect2><title>Styles</title>
<para>
A RC style is specified by a <literal>style</literal> 
declaration in a RC file, and then bound to widgets
with a <literal>widget</literal>, <literal>widget_class</literal>,
or <literal>class</literal> declaration. All styles
applying to a particular widget are composited together
with <literal>widget</literal> declarations overriding
<literal>widget_class</literal> declarations which, in
turn, override <literal>widget</literal> declarations.
Within each type of declaration, later declarations override
earlier ones.
</para>

<para>
Within a <literal>style</literal> declaration, the possible
elements are:

<variablelist>
  <varlistentry>
    <term><literal>bg[<replaceable>state</replaceable>] =
      <replaceable>color</replaceable></literal></term>
     <listitem>
       <para>
         Set color used for the background of most widgets.
       </para>
     </listitem>
  </varlistentry>
  <varlistentry>
    <term><literal>fg[<replaceable>state</replaceable>] =
      <replaceable>color</replaceable></literal></term>
     <listitem>
       <para>
         Set color used for the foreground of most widgets.
       </para>
     </listitem>
  </varlistentry>
  <varlistentry>
    <term><literal>base[<replaceable>state</replaceable>] =
      <replaceable>color</replaceable></literal></term>
     <listitem>
       <para>
         Set color used for the background of widgets displaying
         editable text. This color is used for the background
         of, among others, #GtkText, #GtkEntry, #GtkList, and #GtkClist.
       </para>
     </listitem>
  </varlistentry>
  <varlistentry>
    <term><literal>text[<replaceable>state</replaceable>] =
      <replaceable>color</replaceable></literal></term>
     <listitem>
       <para>
         Set color used for foreground of widgets using
         <literal>base</literal> for the background color.
       </para>
     </listitem>
  </varlistentry>
  <varlistentry>
    <term><literal>bg_text[<replaceable>state</replaceable>] =
      <replaceable>color</replaceable></literal></term>
     <listitem>
       <para>
         Set a background pixmap to be used in place of
         the <literal>bg</literal> color (or for #GtkText,
         in place of the <literal>base</literal> color.
       </para>
     </listitem>
  </varlistentry>
  <varlistentry>
    <term><literal>font = <replaceable>font</replaceable></literal></term>
     <listitem>
       <para>
         Set the font for a widget.
       </para>
     </listitem>
  </varlistentry>
  <varlistentry>
    <term><literal>fontset = <replaceable>font</replaceable></literal></term>
     <listitem>
       <para>
         Set the fontset for a widget. Overrides any
         <literal>font</literal> declarations.
       </para>
     </listitem>
  </varlistentry>
</variablelist>
</para>
<para>
The colors and background pixmaps are specified as a function of the
state of the widget. The states are:

<variablelist>
  <varlistentry>
    <term><literal>NORMAL</literal></term>
    <listitem>
      <para>
        A color used for a widget in its normal state
      </para>
    </listitem>
  </varlistentry>
  <varlistentry>
    <term><literal>ACTIVE</literal></term>
    <listitem>
      <para>
        A variant of the <literal>NORMAL</literal> color used when the
        widget is in the %GTK_STATE_ACTIVE state, and also for
        the trough of a ScrollBar, tabs of a NoteBook
        other than the current tab and similar areas.
        Frequently, this should be a darker variant
        of the <literal>NORMAL</literal> color.
      </para>
    </listitem>
  </varlistentry>
  <varlistentry>
    <term><literal>PRELIGHT</literal></term>
    <listitem>
      <para>
        A color used for widgets in the %GTK_STATE_PRELIGHT state. This
        state is the used for Buttons and MenuItems
        that have the mouse cursor over them, and for 
        their children.
      </para>
    </listitem>
  </varlistentry>
  <varlistentry>
    <term><literal>SELECTED</literal></term>
    <listitem>
      <para>
        A color used to highlight data selected by the user.
        for instance, the selected ListItems in a List widget, and the
        selection in an Editable widget.
      </para>
    </listitem>
  </varlistentry>
  <varlistentry>
    <term><literal>INSENSITIVE</literal></term>
    <listitem>
      <para>
        A color used for the background of widgets that have
        been set insenstivie with gtk_widget_set_senstive()
      </para>
    </listitem>
  </varlistentry>
</variablelist>
</para>

<para>
Colors can be specified as a string <literal>"&hash;rrrrggggbbbb"</literal>,
<literal>"&hash;rrrgggbbb"</literal>, <literal>"&hash;rrggbb"</literal>,
or <literal>"&hash;rgb"</literal>, where <literal>r</literal>
<literal>g</literal>, and <literal>b</literal> are
hex digits, or they can be specified as a triplet of floats
<literal>{ <replaceable>r</replaceable>, <replaceable>g</replaceable>,
<replaceable>b</replaceable>}</literal>.
</para>
</refsect2>

<refsect2><title>Key bindings</title>
<para>
Key bindings allow the user to specify actions to be 
taken on particular key presses. The form of a binding
set declaration is:
</para>

<programlisting>
binding <replaceable>name</replaceable> {
  bind <replaceable>key</replaceable> { 
    <replaceable>signalname</replaceable> (<replaceable>param</replaceable>, ...)
    ...
  }
  ...
}
</programlisting>

<para>
<replaceable>key</replaceable> is a string consisting of a 
series of modifiers followed by the name of a key. The
modifiers can be:
<simplelist>
<member><literal>&lt;alt&gt;</literal></member>
<member><literal>&lt;control&gt;</literal></member>
<member><literal>&lt;mod1&gt;</literal></member>
<member><literal>&lt;mod2&gt;</literal></member>
<member><literal>&lt;mod3&gt;</literal></member>
<member><literal>&lt;mod4&gt;</literal></member>
<member><literal>&lt;mod5&gt;</literal></member>
<member><literal>&lt;release&gt;</literal></member>
<member><literal>&lt;shft&gt;</literal></member>
<member><literal>&lt;shift&gt;</literal></member>
</simplelist>
<literal>&lt;shft&gt;</literal> is an alias for 
<literal>&lt;shift&gt;</literal> and 
<literal>&lt;alt&gt;</literal> is an alias for
<literal>&lt;mod1&gt;</literal>.
</para>

<para>
The action that is bound to the key is a sequence
of signal names (strings) followed by parameters for 
each signal. The signals must be action signals.
(See gtk_signal_new()). Each parameter can be
a float, integer, string, or unquoted string
representing an enumeration value. The types of
the parameters specified must match the types of the 
parameters of the signal.
</para>

<para>
Binding sets are connected to widgets in the
same manner as styles, with one addition. 
A priority can be specified for each pattern,
and within each type of pattern, binding sets
override other binding sets first by priority,
and only then by order of specification. (Later
overrides earlier). The priorities that can
be specified are (highest to lowest):
<simplelist>
<member><literal>HIGHEST</literal></member>
<member><literal>RC</literal></member>
<member><literal>APPLICATION</literal></member>
<member><literal>GTK</literal></member>
<member><literal>LOWEST</literal></member>
</simplelist>
<literal>RC</literal> is the default for bindings
read from an RC file, <literal>APPLICATION</literal>
should be used for bindings an application sets
up, and <literal>GTK</literal> is used for bindings
that GTK+ creates internally.
</para>
</refsect2>

<!-- ##### SECTION See_Also ##### -->
<para>

</para>

<!-- ##### STRUCT GtkRcStyle ##### -->
<para>
The #GtkRcStyle structure is used to represent a set
of information about the appearance of a widget.
This can later be composited together with other
#GtkRcStyle structures to form a #GtkStyle.
</para>

@parent_instance: 
@name: 
@bg_pixmap_name: 
@font_desc: 
@color_flags: 
@fg: 
@bg: 
@text: 
@base: 
@xthickness: 
@ythickness: 

<!-- ##### STRUCT GtkRcStyleClass ##### -->
<para>

</para>


<!-- ##### ENUM GtkRcFlags ##### -->
<para>
The #GtkRcFlags enumeration is used as a bitmask
to specify which fields of a #GtkRcStyle have been
set for each state.
</para>
<variablelist>
 <varlistentry><term> %GTK_RC_FG </term>
 <listitem>
   <para>
   If present, the foreground color has been set for this state.
   </para>
 </listitem>
 </varlistentry>
 <varlistentry><term> %GTK_RC_BG </term>
 <listitem>
   <para>
   If present, the background color has been set for this state.
   </para>
 </listitem>
 </varlistentry>
 <varlistentry><term> %GTK_RC_TEXT </term>
 <listitem>
   <para>
   If present, the text color has been set for this state.
   </para>
 </listitem>
 </varlistentry>
 <varlistentry><term> %GTK_RC_BASE </term>
 <listitem>
   <para>
   If present, the base color has been set for this state.
   </para>
 </listitem>
 </varlistentry>
</variablelist>

@GTK_RC_FG: 
@GTK_RC_BG: 
@GTK_RC_TEXT: 
@GTK_RC_BASE: 

<!-- ##### USER_FUNCTION GtkImageLoader ##### -->
<para>
A GtkImageLoader is used to load a filename found in
a RC file.
</para>

@window: the window for creating image
@colormap: the colormap for this image
@mask: a pointer to the location to store the mask
@transparent_color: the transparent color for the image
@filename: filename to load
@Returns: a #GtkPixmap representing @filename


<!-- ##### ENUM GtkRcTokenType ##### -->
<para>
The #GtkRcTokenType enumeration represents the tokens
in the RC file. It is exposed so that theme engines
can reuse these tokens when parsing the theme-engine
specific portions of a RC file.
</para>

@GTK_RC_TOKEN_INVALID: 
@GTK_RC_TOKEN_INCLUDE: 
@GTK_RC_TOKEN_NORMAL: 
@GTK_RC_TOKEN_ACTIVE: 
@GTK_RC_TOKEN_PRELIGHT: 
@GTK_RC_TOKEN_SELECTED: 
@GTK_RC_TOKEN_INSENSITIVE: 
@GTK_RC_TOKEN_FG: 
@GTK_RC_TOKEN_BG: 
@GTK_RC_TOKEN_TEXT: 
@GTK_RC_TOKEN_BASE: 
@GTK_RC_TOKEN_XTHICKNESS: 
@GTK_RC_TOKEN_YTHICKNESS: 
@GTK_RC_TOKEN_FONT: 
@GTK_RC_TOKEN_FONTSET: 
@GTK_RC_TOKEN_FONT_NAME: 
@GTK_RC_TOKEN_BG_PIXMAP: 
@GTK_RC_TOKEN_PIXMAP_PATH: 
@GTK_RC_TOKEN_STYLE: 
@GTK_RC_TOKEN_BINDING: 
@GTK_RC_TOKEN_BIND: 
@GTK_RC_TOKEN_WIDGET: 
@GTK_RC_TOKEN_WIDGET_CLASS: 
@GTK_RC_TOKEN_CLASS: 
@GTK_RC_TOKEN_LOWEST: 
@GTK_RC_TOKEN_GTK: 
@GTK_RC_TOKEN_APPLICATION: 
@GTK_RC_TOKEN_RC: 
@GTK_RC_TOKEN_HIGHEST: 
@GTK_RC_TOKEN_ENGINE: 
@GTK_RC_TOKEN_MODULE_PATH: 
@GTK_RC_TOKEN_LAST: 

<!-- ##### FUNCTION gtk_rc_get_style ##### -->
<para>
Finds all matching RC styles for a given widget,
composites them together, and then creates a 
#GtkStyle representing the composite appearance.
(GTK+ actually keeps a cache of previously 
created styles, so a new style may not be
created.)
</para>

@widget: a #GtkWidget
@Returns: the resulting style. The caller should
reference the result, since GTK+ will retain the
initial reference count itself for the cache
of created styles.


<!-- ##### FUNCTION gtk_rc_add_widget_name_style ##### -->
<para>
Add a RcStyle that will be looked up by a match against
the widget's pathname. This is equivalent to a:
<programlisting>
widget PATTERN style STYLE
</programlisting>
statement in a RC file.
</para>

@rc_style: the #GtkRcStyle to use for widgets matching @pattern
@pattern: the pattern


<!-- ##### FUNCTION gtk_rc_add_widget_class_style ##### -->
<para>
Add a RcStyle that will be looked up by a match against
the widget's class pathname. This is equivalent to a:

<programlisting>
widget_class PATTERN style STYLE
</programlisting>
statement in a RC file.
</para>

@rc_style: the #GtkRcStyle to use for widgets matching @pattern
@pattern: the pattern


<!-- ##### FUNCTION gtk_rc_add_class_style ##### -->
<para>
Add a RcStyle that will be looked up by a matching against
the class heirarchy of the widget. This is equivalent to a:
<programlisting>
class PATTERN style STYLE
</programlisting>
statement in a RC file.
</para>

@rc_style: the #GtkRcStyle to use for widgets deriving from @pattern
@pattern: the pattern


<!-- ##### FUNCTION gtk_rc_parse ##### -->
<para>
Parse a given resource file.
</para>

@filename: the filename of a file to parse.


<!-- ##### FUNCTION gtk_rc_parse_string ##### -->
<para>
Parse resource information directly from a string.
</para>

@rc_string: a string to parse.


<!-- ##### FUNCTION gtk_rc_reparse_all ##### -->
<para>
If the modification time on any previously read file
has changed, discard all style information
and then reread all previously read RC files.
</para>

@Returns: %TRUE if the files were reread.


<!-- ##### FUNCTION gtk_rc_add_default_file ##### -->
<para>
Adds a file to the list of files to be parsed at the
end of gtk_init().
</para>

@filename: the pathname to the file.


<!-- ##### FUNCTION gtk_rc_get_default_files ##### -->
<para>
Retrieves the current list of RC files that will be parsed
at the end of gtk_init()
</para>

@Returns: A NULL terminated array of filenames. This memory
is owned by GTK+ and must not be freed by the application.
If you want to store this information, you should make a 
copy.


<!-- ##### FUNCTION gtk_rc_set_default_files ##### -->
<para>
Sets the list of files that GTK+ will read at the
end of gtk_init()
</para>

@filenames: A %NULL terminated list of filenames.


<!-- ##### FUNCTION gtk_rc_parse_color ##### -->
<para>
Parses a color in the format expected in a RC file.
</para>

@scanner: a #GtkScanner
@color: a pointer to a #GtkColor structure in which to store the result
@Returns: %G_TOKEN_NONE if parsing suceeded, otherwise the token
that was expected but not found.


<!-- ##### FUNCTION gtk_rc_parse_state ##### -->
<para>
Parses a #GtkStateType variable from the format expected
in a RC file.
</para>

@scanner: a #GtkScanner (must be initialized for parsing an RC file)
@state: A pointer to a #GtkStateType variable in which to
store the result.
@Returns: %G_TOKEN_NONE if parsing suceeded, otherwise the token
that was expected but not found.


<!-- ##### FUNCTION gtk_rc_parse_priority ##### -->
<para>
Parses a #GtkPathPriorityType variable from the format expected
in a RC file.
</para>

@scanner: a #GtkScanner (must be initialized for parsing an RC file)
@priority: A pointer to #GtkPathPriorityType variable in which
to store the result.
@Returns: %G_TOKEN_NONE if parsing suceeded, otherwise the token
that was expected but not found.


<!-- ##### FUNCTION gtk_rc_find_module_in_path ##### -->
<para>
Looks up a file in the current module path.
</para>

@module_file: The name of the module to search for.
@Returns: The filename, if found. (Must be freed with g_free()),
otherwise %NULL.


<!-- ##### FUNCTION gtk_rc_find_pixmap_in_path ##### -->
<para>
Looks up a file in the current pixmap path. If the file is
not found, it outputs a warning message using g_warning()
and returns %NULL.
</para>

@scanner: a #GtkScanner. Used for printing out warning messages
if the file is not found.
@pixmap_file: The name of the file to search for.
@Returns: The filename, if found. (Must be freed with g_free()),
otherwise %NULL.


<!-- ##### FUNCTION gtk_rc_get_module_dir ##### -->
<para>
Returns the directory in which GTK+ will look for
theme engines.
</para>

@Returns: The directory. (Must be freed with g_free())


<!-- ##### FUNCTION gtk_rc_get_theme_dir ##### -->
<para>
Returns the standard directory in which themes should
be installed. (GTK+ does not actually use this directory
itself.)
</para>

@Returns: The directory. (Must be freed with g_free())


<!-- ##### FUNCTION gtk_rc_set_image_loader ##### -->
<para>
Sets the function that GTK+ will use to load images 
</para>

@loader: the #GtkImageLoader to use


<!-- ##### FUNCTION gtk_rc_load_image ##### -->
<para>
Internal function. Loads an image using the current
image loader.
</para>

@colormap: the colormap to use for the image
@transparent_color: the transparent color for the image
@filename: the filename of the image file
@Returns: a #GtkPixmap representing @filename


<!-- ##### FUNCTION gtk_rc_style_new ##### -->
<para>
Create a new #GtkRcStyle with no fields set and
a reference count of 1.
</para>

@Returns: the newly create #GtkRcStyle


<!-- ##### FUNCTION gtk_rc_style_copy ##### -->
<para>

</para>

@orig: 
@Returns: 


<!-- ##### FUNCTION gtk_rc_style_ref ##### -->
<para>
Increment the reference count of a #GtkRcStyle.
</para>

@rc_style: a #GtkRcStyle


<!-- ##### FUNCTION gtk_rc_style_unref ##### -->
<para>
Decrement the reference count of a #GtkRcStyle and
free if the result is 0.
</para>

@rc_style: a #GtkRcStyle