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

<!-- ##### SECTION Title ##### -->
GtkEditable

<!-- ##### SECTION Short_Description ##### -->
Base class for text-editing widgets.

<!-- ##### SECTION Long_Description ##### -->
<para>
The #GtkEditable class is a base class for widgets
for editing text, such as #GtkEntry and #GtkText. It
cannot be instantiated by itself. The editable
class contains functions for generically manipulating
an editable widget, a large number of action signals
used for key bindings, and several signals that
an application can connect to to modify the behavior
of a widget. 
</para>

<para>
As an example of the latter usage, by connecting
the following handler to "insert_text", an application
can convert all entry into a widget into uppercase.

<example>
<title>Forcing entry to uppercase.</title>
<programlisting>
#include &lt;ctype.h&gt;

void
insert_text_handler (GtkEditable *editable,
                     const gchar *text,
                     gint         length,
                     gint        *position,
                     gpointer     data)
{
  int i;
  gchar *result = g_new (gchar, length);

  for (i = 0; i &lt; length; i++)
    result[i] = islower (text[i]) ? toupper (text[i]) : text[i];

  g_signal_handlers_block_by_func (GTK_OBJECT (editable), 
				   insert_text_handler, data);
  gtk_editable_insert_text (editable, result, length, position);
  g_signal_handlers_unblock_by_func (GTK_OBJECT (editable), 
                                     insert_text_handler, data);

  g_signal_stop_emission_by_name (GTK_OBJECT (editable), "insert_text"); 

  g_free (result);
}
</programlisting>
</example>
</para>

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

</para>

<!-- ##### STRUCT GtkEditable ##### -->
<para>
The #GtkEditable structure contains the following fields.
(These fields should be considered read-only. They should
never be set by an application.)

<informaltable pgwide=1 frame="none" role="struct">
<tgroup cols="2"><colspec colwidth="2*"><colspec colwidth="8*">
<tbody>

<row>
<entry>#guint selection_start;</entry>
<entry>the starting position of the selected characters 
 in the widget.</entry>
</row>

<row>
<entry>#guint selection_end;</entry>
<entry>the end position of the selected characters 
 in the widget.</entry>
</row>

<row>
<entry>#guint editable;</entry>
<entry>a flag indicating whether or not the widget is
editable by the user.</entry>
</row>

</tbody></tgroup></informaltable>
</para>


<!-- ##### FUNCTION gtk_editable_select_region ##### -->
<para>
Selects a region of text. The characters that
are selected are those characters at positions from
@start_pos up to, but not including @end_pos. If 
@end_pos is negative, then the the characters selected
will be those characters from @start_pos to the end
of the text.
</para>

@editable: a #GtkEditable widget.
@start: the starting position.
@end: the end position.


<!-- ##### FUNCTION gtk_editable_get_selection_bounds ##### -->
<para>
Gets the current selection bounds, if there is a selection.
</para>

@editable: a #GtkEditable widget.
@start: location to store the starting position, or %NULL.
@end: location to store the end position, or %NULL.
@Returns: %TRUE if there is a selection.


<!-- ##### FUNCTION gtk_editable_insert_text ##### -->
<para>
Inserts text at a given position.
</para>

@editable: a #GtkEditable widget.
@new_text: the text to insert.
@new_text_length: the length of the text to insert, in bytes
@position: an inout parameter. The caller initializes it to
           the position at which to insert the text. After the
           call it points at the position after the newly
           inserted text.


<!-- ##### FUNCTION gtk_editable_delete_text ##### -->
<para>
Deletes a sequence of characters. The characters that
are deleted are those characters at positions from
@start_pos up to, but not including @end_pos. If 
@end_pos is negative, then the the characters deleted
will be those characters from @start_pos to the end
of the text.
</para>

@editable: a #GtkEditable widget.
@start_pos: the starting position.
@end_pos: the end position.


<!-- ##### FUNCTION gtk_editable_get_chars ##### -->
<para>
Retrieves a sequence of characters. The characters that
are retrieved are those characters at positions from
@start_pos up to, but not including @end_pos. If 
@end_pos is negative, then the the characters retrieved
will be those characters from @start_pos to the end
of the text.
</para>

@editable: a #GtkEditable widget.
@start_pos: the starting position.
@end_pos: the end position.
@Returns: the characters in the indicated region.
          The result must be freed with g_free() when
          the application is finished with it.


<!-- ##### FUNCTION gtk_editable_cut_clipboard ##### -->
<para>
Causes the characters in the current selection to
be copied to the clipboard and then deleted from
the widget.
</para>

@editable: a #GtkEditable widget.


<!-- ##### FUNCTION gtk_editable_copy_clipboard ##### -->
<para>
Causes the characters in the current selection to
be copied to the clipboard.
</para>

@editable: a #GtkEditable widget.


<!-- ##### FUNCTION gtk_editable_paste_clipboard ##### -->
<para>
Causes the contents of the clipboard to be pasted into
the given widget at the current cursor position.
</para>

@editable: a #GtkEditable widget.


<!-- ##### FUNCTION gtk_editable_delete_selection ##### -->
<para>
Deletes the current contents of the widgets selection and
disclaims the selection.
</para>

@editable: a #GtkEditable widget.


<!-- ##### FUNCTION gtk_editable_set_position ##### -->
<para>
Sets the cursor position.
</para>

@editable: a #GtkEditable widget.
@position: the position of the cursor. The cursor is displayed
           before the character with the given (base 0) index
           in the widget. The value must be less than or
           equal to the number of characters in the widget.
           A value of -1 indicates that the position should
           be set after the last character in the entry.
           Note that this position is in characters, not in
           bytes.


<!-- ##### FUNCTION gtk_editable_get_position ##### -->
<para>
Retrieves the current cursor position.
</para>

@editable: a #GtkEditable widget.
@Returns: the position of the cursor. The cursor is displayed
           before the character with the given (base 0) index
           in the widget. The value will be less than or
           equal to the number of characters in the widget.
           Note that this position is in characters, not in
           bytes.


<!-- ##### FUNCTION gtk_editable_set_editable ##### -->
<para>
Determines if the user can edit the text in the editable
widget or not.
</para>

@editable: a #GtkEditable widget.
@is_editable: %TRUE if the user is allowed to edit the text
  in the widget.


<!-- ##### FUNCTION gtk_editable_get_editable ##### -->
<para>

</para>

@editable: 
@Returns: 


<!-- ##### SIGNAL GtkEditable::changed ##### -->
<para>
Indicates that the user has changed the contents
of the widget.
</para>

@editable: the object which received the signal.

<!-- ##### SIGNAL GtkEditable::delete-text ##### -->
<para>
This signal is emitted when text is deleted from
the widget by the user. The default handler for
this signal will normally be responsible for inserting
the text, so by connecting to this signal and then
stopping the signal with gtk_signal_emit_stop(), it
is possible to modify the inserted text, or prevent
it from being inserted entirely. The @start_pos
and @end_pos parameters are interpreted as for
gtk_editable_delete_text()
</para>

@editable: the object which received the signal.
@start_pos: the starting position.
@end_pos: the end position.

<!-- ##### SIGNAL GtkEditable::insert-text ##### -->
<para>
This signal is emitted when text is inserted into
the widget by the user. The default handler for
this signal will normally be responsible for inserting
the text, so by connecting to this signal and then
stopping the signal with gtk_signal_emit_stop(), it
is possible to modify the inserted text, or prevent
it from being inserted entirely.
</para>

@editable: the object which received the signal.
@new_text: the new text to insert.
@new_text_length: the length of the new text.
@position: the position at which to insert the new text.
           this is an in-out paramter. After the signal
           emission is finished, it should point after   
           the newly inserted text.