forked from AuroraMiddleware/gtk
1952300896
Sun Jul 18 15:28:24 2004 Soeren Sandmann <sandmann@daimi.au.dk> * gtk/gtkdnd.c (gtk_drag_source_set, gtk_drag_dest_set): Create an empty target list if targets is NULL. * configure.in: Add check for X11/extensions/sync.h. (#147416, Morten Welinder)
291 lines
8.1 KiB
Plaintext
291 lines
8.1 KiB
Plaintext
<!-- ##### SECTION Title ##### -->
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GtkEditable
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<!-- ##### SECTION Short_Description ##### -->
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Interface for text-editing widgets.
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<!-- ##### SECTION Long_Description ##### -->
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<para>
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The #GtkEditable interface is an interface which should be implemented by
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text editing widgets, such as #GtkEntry and #GtkText. It contains functions
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for generically manipulating an editable widget, a large number of action
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signals used for key bindings, and several signals that an application can
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connect to to modify the behavior of a widget.
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</para>
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<para>
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As an example of the latter usage, by connecting
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the following handler to "insert_text", an application
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can convert all entry into a widget into uppercase.
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<example>
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<title>Forcing entry to uppercase.</title>
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<programlisting>
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#include <ctype.h>
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void
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insert_text_handler (GtkEditable *editable,
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const gchar *text,
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gint length,
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gint *position,
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gpointer data)
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{
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int i;
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gchar *result = g_utf8_strup (text, length);
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g_signal_handlers_block_by_func (editable,
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(gpointer) insert_text_handler, data);
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gtk_editable_insert_text (editable, result, length, position);
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g_signal_handlers_unblock_by_func (editable,
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(gpointer) insert_text_handler, data);
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g_signal_stop_emission_by_name (editable, "insert_text");
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g_free (result);
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}
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</programlisting>
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</example>
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</para>
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<!-- ##### SECTION See_Also ##### -->
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<para>
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</para>
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<!-- ##### STRUCT GtkEditable ##### -->
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<para>
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The #GtkEditable structure contains the following fields.
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(These fields should be considered read-only. They should
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never be set by an application.)
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<informaltable pgwide="1" frame="none" role="struct">
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<tgroup cols="2"><colspec colwidth="2*"/><colspec colwidth="8*"/>
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<tbody>
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<row>
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<entry>#guint selection_start;</entry>
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<entry>the starting position of the selected characters
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in the widget.</entry>
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</row>
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<row>
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<entry>#guint selection_end;</entry>
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<entry>the end position of the selected characters
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in the widget.</entry>
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</row>
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<row>
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<entry>#guint editable;</entry>
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<entry>a flag indicating whether or not the widget is
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editable by the user.</entry>
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</row>
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</tbody></tgroup></informaltable>
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</para>
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<!-- ##### FUNCTION gtk_editable_select_region ##### -->
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<para>
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Selects a region of text. The characters that
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are selected are those characters at positions from
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@start_pos up to, but not including @end_pos. If
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@end_pos is negative, then the the characters selected
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will be those characters from @start_pos to the end
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of the text.
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</para>
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@editable: a #GtkEditable widget.
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@start: the starting position.
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@end: the end position.
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<!-- ##### FUNCTION gtk_editable_get_selection_bounds ##### -->
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<para>
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Gets the current selection bounds, if there is a selection.
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</para>
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@editable: a #GtkEditable widget.
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@start: location to store the starting position, or %NULL.
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@end: location to store the end position, or %NULL.
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@Returns: %TRUE if there is a selection.
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<!-- ##### FUNCTION gtk_editable_insert_text ##### -->
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<para>
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Inserts text at a given position.
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</para>
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@editable: a #GtkEditable widget.
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@new_text: the text to insert.
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@new_text_length: the length of the text to insert, in bytes
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@position: an inout parameter. The caller initializes it to
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the position at which to insert the text. After the
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call it points at the position after the newly
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inserted text.
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<!-- ##### FUNCTION gtk_editable_delete_text ##### -->
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<para>
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Deletes a sequence of characters. The characters that
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are deleted are those characters at positions from
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@start_pos up to, but not including @end_pos. If
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@end_pos is negative, then the the characters deleted
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will be those characters from @start_pos to the end
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of the text.
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</para>
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@editable: a #GtkEditable widget.
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@start_pos: the starting position.
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@end_pos: the end position.
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<!-- ##### FUNCTION gtk_editable_get_chars ##### -->
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<para>
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Retrieves a sequence of characters. The characters that
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are retrieved are those characters at positions from
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@start_pos up to, but not including @end_pos. If
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@end_pos is negative, then the the characters retrieved
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will be those characters from @start_pos to the end
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of the text.
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</para>
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@editable: a #GtkEditable widget.
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@start_pos: the starting position.
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@end_pos: the end position.
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@Returns: the characters in the indicated region.
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The result must be freed with g_free() when
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the application is finished with it.
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<!-- ##### FUNCTION gtk_editable_cut_clipboard ##### -->
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<para>
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Causes the characters in the current selection to
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be copied to the clipboard and then deleted from
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the widget.
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</para>
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@editable: a #GtkEditable widget.
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<!-- ##### FUNCTION gtk_editable_copy_clipboard ##### -->
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<para>
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Causes the characters in the current selection to
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be copied to the clipboard.
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</para>
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@editable: a #GtkEditable widget.
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<!-- ##### FUNCTION gtk_editable_paste_clipboard ##### -->
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<para>
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Causes the contents of the clipboard to be pasted into
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the given widget at the current cursor position.
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</para>
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@editable: a #GtkEditable widget.
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<!-- ##### FUNCTION gtk_editable_delete_selection ##### -->
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<para>
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Deletes the current contents of the widgets selection and
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disclaims the selection.
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</para>
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@editable: a #GtkEditable widget.
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<!-- ##### FUNCTION gtk_editable_set_position ##### -->
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<para>
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Sets the cursor position.
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</para>
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@editable: a #GtkEditable widget.
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@position: the position of the cursor. The cursor is displayed
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before the character with the given (base 0) index
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in the widget. The value must be less than or
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equal to the number of characters in the widget.
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A value of -1 indicates that the position should
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be set after the last character in the entry.
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Note that this position is in characters, not in
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bytes.
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<!-- ##### FUNCTION gtk_editable_get_position ##### -->
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<para>
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Retrieves the current cursor position.
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</para>
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@editable: a #GtkEditable widget.
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@Returns: the position of the cursor. The cursor is displayed
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before the character with the given (base 0) index
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in the widget. The value will be less than or
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equal to the number of characters in the widget.
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Note that this position is in characters, not in
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bytes.
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<!-- ##### FUNCTION gtk_editable_set_editable ##### -->
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<para>
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Determines if the user can edit the text in the editable
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widget or not.
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</para>
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@editable: a #GtkEditable widget.
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@is_editable: %TRUE if the user is allowed to edit the text
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in the widget.
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<!-- ##### FUNCTION gtk_editable_get_editable ##### -->
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<para>
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</para>
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@editable:
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@Returns:
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<!-- ##### SIGNAL GtkEditable::changed ##### -->
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<para>
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Indicates that the user has changed the contents
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of the widget.
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</para>
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@editable: the object which received the signal.
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<!-- ##### SIGNAL GtkEditable::delete-text ##### -->
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<para>
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This signal is emitted when text is deleted from
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the widget by the user. The default handler for
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this signal will normally be responsible for inserting
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the text, so by connecting to this signal and then
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stopping the signal with gtk_signal_emit_stop(), it
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is possible to modify the inserted text, or prevent
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it from being inserted entirely. The @start_pos
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and @end_pos parameters are interpreted as for
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gtk_editable_delete_text()
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</para>
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@editable: the object which received the signal.
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@start_pos: the starting position.
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@end_pos: the end position.
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<!-- ##### SIGNAL GtkEditable::insert-text ##### -->
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<para>
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This signal is emitted when text is inserted into
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the widget by the user. The default handler for
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this signal will normally be responsible for inserting
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the text, so by connecting to this signal and then
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stopping the signal with gtk_signal_emit_stop(), it
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is possible to modify the inserted text, or prevent
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it from being inserted entirely.
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</para>
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@editable: the object which received the signal.
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@new_text: the new text to insert.
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@new_text_length: the length of the new text.
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@position: the position at which to insert the new text.
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this is an in-out paramter. After the signal
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emission is finished, it should point after
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the newly inserted text.
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