gboolean gtk_im_context_get_surrounding ( GtkIMContext* context, gchar** text, gint* cursor_index )
Retrieves context around the insertion point. Input methods typically want context in order to constrain input text based on existing text; this is important for languages such as Thai where only some sequences of characters are allowed.
This function is implemented by emitting the GtkIMContext::retrieve_surrounding signal on the input method; in response to this signal, a widget should provide as much context as is available, up to an entire paragraph, by calling gtk_im_context_set_surrounding(). Note that there is no obligation for a widget to respond to the ::retrieve_surrounding signal, so input methods must be prepared to function without context.
Location to store a UTF-8 encoded string of text holding context around the insertion point. If the function returns
TRUE, then you must free the result stored in this location with g_free().
The argument will be set by the function. The caller of the method takes ownership of the returned data, and is responsible for freeing it. The value is a NUL terminated UTF-8 string.
Location to store byte index of the insertion cursor within
The argument will be set by the function.