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>Text Entries</A
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><P
>The Entry widget allows text to be typed and displayed in a single line
text box. The text may be set with function calls that allow new text
to replace, prepend or append the current contents of the Entry widget.</P
><P
>Create a new Entry widget with the following function.</P
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><PRE
CLASS="PROGRAMLISTING"
>GtkWidget *gtk_entry_new( void );</PRE
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><P
>The next function alters the text which is currently
within the Entry widget.</P
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>void gtk_entry_set_text( GtkEntry *entry,
const gchar *text );</PRE
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><P
>The function gtk_entry_set_text() sets the contents of the Entry widget,
replacing the current contents. Note that the class Entry implements the Editable
interface (yes, gobject supports Java-like interfaces) which contains some more
functions for manipulating the contents.
</P
><P
>The contents of the Entry can be retrieved by using a call to the
following function. This is useful in the callback functions described below.</P
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><PRE
CLASS="PROGRAMLISTING"
>const gchar *gtk_entry_get_text( GtkEntry *entry );</PRE
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><P
>The value returned by this function is used internally, and must not
be freed using either free() or g_free().</P
><P
>If we don't want the contents of the Entry to be changed by someone typing
into it, we can change its editable state.</P
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>void gtk_editable_set_editable( GtkEditable *entry,
gboolean editable );</PRE
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><P
>The function above allows us to toggle the editable state of the
Entry widget by passing in a TRUE or FALSE value for the <TT
CLASS="LITERAL"
>editable</TT
>
argument.</P
><P
>If we are using the Entry where we don't want the text entered to be
visible, for example when a password is being entered, we can use the
following function, which also takes a boolean flag.</P
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><PRE
CLASS="PROGRAMLISTING"
>void gtk_entry_set_visibility( GtkEntry *entry,
gboolean visible );</PRE
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><P
>A region of the text may be set as selected by using the following
function. This would most often be used after setting some default
text in an Entry, making it easy for the user to remove it.</P
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><PRE
CLASS="PROGRAMLISTING"
>void gtk_editable_select_region( GtkEditable *entry,
gint start,
gint end );</PRE
></TD
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><P
>If we want to catch when the user has entered text, we can connect to
the <TT
CLASS="LITERAL"
>activate</TT
> or <TT
CLASS="LITERAL"
>changed</TT
> signal. Activate is raised when the
user hits the enter key within the Entry widget. Changed is raised
when the text changes at all, e.g., for every character entered or
removed.</P
><P
>The following code is an example of using an Entry widget.</P
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CLASS="PROGRAMLISTING"
> #include <stdio.h>
#include <stdlib.h>
#include <gtk/gtk.h>
static void enter_callback( GtkWidget *widget,
GtkWidget *entry )
{
const gchar *entry_text;
entry_text = gtk_entry_get_text (GTK_ENTRY (entry));
printf ("Entry contents: %s\n", entry_text);
}
static void entry_toggle_editable( GtkWidget *checkbutton,
GtkWidget *entry )
{
gtk_editable_set_editable (GTK_EDITABLE (entry),
GTK_TOGGLE_BUTTON (checkbutton)->active);
}
static void entry_toggle_visibility( GtkWidget *checkbutton,
GtkWidget *entry )
{
gtk_entry_set_visibility (GTK_ENTRY (entry),
GTK_TOGGLE_BUTTON (checkbutton)->active);
}
int main( int argc,
char *argv[] )
{
GtkWidget *window;
GtkWidget *vbox, *hbox;
GtkWidget *entry;
GtkWidget *button;
GtkWidget *check;
gint tmp_pos;
gtk_init (&argc, &argv);
/* create a new window */
window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
gtk_widget_set_size_request (GTK_WIDGET (window), 200, 100);
gtk_window_set_title (GTK_WINDOW (window), "GTK Entry");
g_signal_connect (window, "destroy",
G_CALLBACK (gtk_main_quit), NULL);
g_signal_connect_swapped (window, "delete-event",
G_CALLBACK (gtk_widget_destroy),
window);
vbox = gtk_vbox_new (FALSE, 0);
gtk_container_add (GTK_CONTAINER (window), vbox);
gtk_widget_show (vbox);
entry = gtk_entry_new ();
gtk_entry_set_max_length (GTK_ENTRY (entry), 50);
g_signal_connect (entry, "activate",
G_CALLBACK (enter_callback),
entry);
gtk_entry_set_text (GTK_ENTRY (entry), "hello");
tmp_pos = GTK_ENTRY (entry)->text_length;
gtk_editable_insert_text (GTK_EDITABLE (entry), " world", -1, &tmp_pos);
gtk_editable_select_region (GTK_EDITABLE (entry),
0, GTK_ENTRY (entry)->text_length);
gtk_box_pack_start (GTK_BOX (vbox), entry, TRUE, TRUE, 0);
gtk_widget_show (entry);
hbox = gtk_hbox_new (FALSE, 0);
gtk_container_add (GTK_CONTAINER (vbox), hbox);
gtk_widget_show (hbox);
check = gtk_check_button_new_with_label ("Editable");
gtk_box_pack_start (GTK_BOX (hbox), check, TRUE, TRUE, 0);
g_signal_connect (check, "toggled",
G_CALLBACK (entry_toggle_editable), entry);
gtk_toggle_button_set_active (GTK_TOGGLE_BUTTON (check), TRUE);
gtk_widget_show (check);
check = gtk_check_button_new_with_label ("Visible");
gtk_box_pack_start (GTK_BOX (hbox), check, TRUE, TRUE, 0);
g_signal_connect (check, "toggled",
G_CALLBACK (entry_toggle_visibility), entry);
gtk_toggle_button_set_active (GTK_TOGGLE_BUTTON (check), TRUE);
gtk_widget_show (check);
button = gtk_button_new_from_stock (GTK_STOCK_CLOSE);
g_signal_connect_swapped (button, "clicked",
G_CALLBACK (gtk_widget_destroy),
window);
gtk_box_pack_start (GTK_BOX (vbox), button, TRUE, TRUE, 0);
gtk_widget_set_can_default (button, TRUE);
gtk_widget_grab_default (button);
gtk_widget_show (button);
gtk_widget_show (window);
gtk_main();
return 0;
}</PRE
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