>

>

>Paned Window Widgets

>

NAME="GENERATOR"

CONTENT="Modular DocBook HTML Stylesheet Version 1.79">

REL="HOME"

TITLE="GTK+ 2.0 Tutorial"

HREF="book1.html">

REL="UP"

TITLE="Container Widgets"

HREF="c1226.html">

REL="PREVIOUS"

TITLE="Aspect Frames"

HREF="x1317.html">

REL="NEXT"

TITLE="Viewports"

HREF="x1352.html">

>

CLASS="SECT1"

BGCOLOR="#FFFFFF"

TEXT="#000000"

LINK="#0000FF"

VLINK="#840084"

ALINK="#0000FF"

>

CLASS="NAVHEADER"

>

SUMMARY="Header navigation table"

WIDTH="100%"

BORDER="0"

CELLPADDING="0"

CELLSPACING="0"

>

>

COLSPAN="3"

ALIGN="center"

>GTK+ 2.0 Tutorial

>

>

>

WIDTH="10%"

ALIGN="left"

VALIGN="bottom"

>

HREF="x1317.html"

ACCESSKEY="P"

><<< Previous

>

>

WIDTH="80%"

ALIGN="center"

VALIGN="bottom"

>Container Widgets

>

WIDTH="10%"

ALIGN="right"

VALIGN="bottom"

>

HREF="x1352.html"

ACCESSKEY="N"

>Next >>>

>

>

>

>

ALIGN="LEFT"

WIDTH="100%">

>

CLASS="SECT1"

>

CLASS="SECT1"

>

NAME="SEC-PANEDWINDOWWIDGETS"

>Paned Window Widgets

>

>

>The paned window widgets are useful when you want to divide an area

into two parts, with the relative size of the two parts controlled by

the user. A groove is drawn between the two portions with a handle

that the user can drag to change the ratio. The division can either be

horizontal (HPaned) or vertical (VPaned).

>

>To create a new paned window, call one of:

>

BORDER="0"

BGCOLOR="#E0E0E0"

WIDTH="100%"

>

>

>

CLASS="PROGRAMLISTING"

>GtkWidget *gtk_hpaned_new (void);

GtkWidget *gtk_vpaned_new (void);

>

>

>

>

>After creating the paned window widget, you need to add child widgets

to its two halves. To do this, use the functions:

>

BORDER="0"

BGCOLOR="#E0E0E0"

WIDTH="100%"

>

>

>

CLASS="PROGRAMLISTING"

>void gtk_paned_add1 (GtkPaned *paned, GtkWidget *child);

void gtk_paned_add2 (GtkPaned *paned, GtkWidget *child);

>

>

>

>

>

CLASS="LITERAL"

>gtk_paned_add1()

> adds the child widget to the left or top half of

the paned window. 

CLASS="LITERAL"

>gtk_paned_add2()

> adds the child widget to the

right or bottom half of the paned window.

>

>As an example, we will create part of the user interface of an

imaginary email program. A window is divided into two portions

vertically, with the top portion being a list of email messages and

the bottom portion the text of the email message. Most of the program

is pretty straightforward. A couple of points to note: text can't be

added to a Text widget until it is realized. This could be done by

calling gtk_widget_realize(), but as a demonstration of an

alternate technique, we connect a handler to the "realize" signal to

add the text. Also, we need to add the 

CLASS="LITERAL"

>GTK_SHRINK

> option to some

of the items in the table containing the text window and its

scrollbars, so that when the bottom portion is made smaller, the

correct portions shrink instead of being pushed off the bottom of the

window.

>

>

CLASS="INLINEMEDIAOBJECT"

>

SRC="images/paned.png">

>

>

BORDER="0"

BGCOLOR="#E0E0E0"

WIDTH="100%"

>

>

>

CLASS="PROGRAMLISTING"

>
#include <stdio.h>

#include <gtk/gtk.h>

/* Create the list of "messages" */

static GtkWidget *create_list( void )

{

    GtkWidget *scrolled_window;

    GtkWidget *tree_view;

    GtkListStore *model;

    GtkTreeIter iter;

    GtkCellRenderer *cell;

    GtkTreeViewColumn *column;

    int i;

    /* Create a new scrolled window, with scrollbars only if needed */

    scrolled_window = gtk_scrolled_window_new (NULL, NULL);

    gtk_scrolled_window_set_policy (GTK_SCROLLED_WINDOW (scrolled_window),

				    GTK_POLICY_AUTOMATIC, 

				    GTK_POLICY_AUTOMATIC);

    model = gtk_list_store_new (1, G_TYPE_STRING);

    tree_view = gtk_tree_view_new ();

    gtk_container_add (GTK_CONTAINER (scrolled_window), tree_view);

    gtk_tree_view_set_model (GTK_TREE_VIEW (tree_view), GTK_TREE_MODEL (model));

    gtk_widget_show (tree_view);

    /* Add some messages to the window */

    for (i = 0; i < 10; i++) {

        gchar *msg = g_strdup_printf ("Message #%d", i);

        gtk_list_store_append (GTK_LIST_STORE (model), &iter);

        gtk_list_store_set (GTK_LIST_STORE (model), 

	                    &iter,

                            0, msg,

	                    -1);

	g_free (msg);

    }

    cell = gtk_cell_renderer_text_new ();

    column = gtk_tree_view_column_new_with_attributes ("Messages",

                                                       cell,

                                                       "text", 0,

                                                       NULL);

    gtk_tree_view_append_column (GTK_TREE_VIEW (tree_view),

	  		         GTK_TREE_VIEW_COLUMN (column));

    return scrolled_window;

}

/* Add some text to our text widget - this is a callback that is invoked

when our window is realized. We could also force our window to be

realized with gtk_widget_realize, but it would have to be part of

a hierarchy first */

static void insert_text( GtkTextBuffer *buffer )

{

   GtkTextIter iter;

   gtk_text_buffer_get_iter_at_offset (buffer, &iter, 0);

   gtk_text_buffer_insert (buffer, &iter,   

    "From: pathfinder@nasa.gov\n"

    "To: mom@nasa.gov\n"

    "Subject: Made it!\n"

    "\n"

    "We just got in this morning. The weather has been\n"

    "great - clear but cold, and there are lots of fun sights.\n"

    "Sojourner says hi. See you soon.\n"

    " -Path\n", -1);

}

/* Create a scrolled text area that displays a "message" */

static GtkWidget *create_text( void )

{

   GtkWidget *scrolled_window;

   GtkWidget *view;

   GtkTextBuffer *buffer;

   view = gtk_text_view_new ();

   buffer = gtk_text_view_get_buffer (GTK_TEXT_VIEW (view));

   scrolled_window = gtk_scrolled_window_new (NULL, NULL);

   gtk_scrolled_window_set_policy (GTK_SCROLLED_WINDOW (scrolled_window),

		   	           GTK_POLICY_AUTOMATIC,

				   GTK_POLICY_AUTOMATIC);

   gtk_container_add (GTK_CONTAINER (scrolled_window), view);

   insert_text (buffer);

   gtk_widget_show_all (scrolled_window);

   return scrolled_window;

}

int main( int   argc,

          char *argv[] )

{

    GtkWidget *window;

    GtkWidget *vpaned;

    GtkWidget *list;

    GtkWidget *text;

    gtk_init (&argc, &argv);

    window = gtk_window_new (GTK_WINDOW_TOPLEVEL);

    gtk_window_set_title (GTK_WINDOW (window), "Paned Windows");

    g_signal_connect (window, "destroy",

	              G_CALLBACK (gtk_main_quit), NULL);

    gtk_container_set_border_width (GTK_CONTAINER (window), 10);

    gtk_widget_set_size_request (GTK_WIDGET (window), 450, 400);

    /* create a vpaned widget and add it to our toplevel window */

    vpaned = gtk_vpaned_new ();

    gtk_container_add (GTK_CONTAINER (window), vpaned);

    gtk_widget_show (vpaned);

    /* Now create the contents of the two halves of the window */

    list = create_list ();

    gtk_paned_add1 (GTK_PANED (vpaned), list);

    gtk_widget_show (list);

    text = create_text ();

    gtk_paned_add2 (GTK_PANED (vpaned), text);

    gtk_widget_show (text);

    gtk_widget_show (window);

    gtk_main ();

    return 0;

}

>

>

>

>

>

CLASS="NAVFOOTER"

>

ALIGN="LEFT"

WIDTH="100%">

SUMMARY="Footer navigation table"

WIDTH="100%"

BORDER="0"

CELLPADDING="0"

CELLSPACING="0"

>

>

WIDTH="33%"

ALIGN="left"

VALIGN="top"

>

HREF="x1317.html"

ACCESSKEY="P"

><<< Previous

>

>

WIDTH="34%"

ALIGN="center"

VALIGN="top"

>

HREF="book1.html"

ACCESSKEY="H"

>Home

>

>

WIDTH="33%"

ALIGN="right"

VALIGN="top"

>

HREF="x1352.html"

ACCESSKEY="N"

>Next >>>

>

>

>

>

WIDTH="33%"

ALIGN="left"

VALIGN="top"

>Aspect Frames

>

WIDTH="34%"

ALIGN="center"

VALIGN="top"

>

HREF="c1226.html"

ACCESSKEY="U"

>Up

>

>

WIDTH="33%"

ALIGN="right"

VALIGN="top"

>Viewports

>

>

>

>

>

>