<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/loose.dtd"> <HTML ><HEAD ><TITLE >Paned Window Widgets</TITLE ><META NAME="GENERATOR" CONTENT="Modular DocBook HTML Stylesheet Version 1.79"><LINK REL="HOME" TITLE="GTK+ 2.0 Tutorial" HREF="book1.html"><LINK REL="UP" TITLE="Container Widgets" HREF="c1226.html"><LINK REL="PREVIOUS" TITLE="Aspect Frames" HREF="x1317.html"><LINK REL="NEXT" TITLE="Viewports" HREF="x1352.html"></HEAD ><BODY CLASS="SECT1" BGCOLOR="#FFFFFF" TEXT="#000000" LINK="#0000FF" VLINK="#840084" ALINK="#0000FF" ><DIV CLASS="NAVHEADER" ><TABLE SUMMARY="Header navigation table" WIDTH="100%" BORDER="0" CELLPADDING="0" CELLSPACING="0" ><TR ><TH COLSPAN="3" ALIGN="center" >GTK+ 2.0 Tutorial</TH ></TR ><TR ><TD WIDTH="10%" ALIGN="left" VALIGN="bottom" ><A HREF="x1317.html" ACCESSKEY="P" ><<< Previous</A ></TD ><TD WIDTH="80%" ALIGN="center" VALIGN="bottom" >Container Widgets</TD ><TD WIDTH="10%" ALIGN="right" VALIGN="bottom" ><A HREF="x1352.html" ACCESSKEY="N" >Next >>></A ></TD ></TR ></TABLE ><HR ALIGN="LEFT" WIDTH="100%"></DIV ><DIV CLASS="SECT1" ><H1 CLASS="SECT1" ><A NAME="SEC-PANEDWINDOWWIDGETS" >Paned Window Widgets</A ></H1 ><P >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).</P ><P >To create a new paned window, call one of:</P ><TABLE BORDER="0" BGCOLOR="#E0E0E0" WIDTH="100%" ><TR ><TD ><PRE CLASS="PROGRAMLISTING" >GtkWidget *gtk_hpaned_new (void); GtkWidget *gtk_vpaned_new (void);</PRE ></TD ></TR ></TABLE ><P >After creating the paned window widget, you need to add child widgets to its two halves. To do this, use the functions:</P ><TABLE BORDER="0" BGCOLOR="#E0E0E0" WIDTH="100%" ><TR ><TD ><PRE CLASS="PROGRAMLISTING" >void gtk_paned_add1 (GtkPaned *paned, GtkWidget *child); void gtk_paned_add2 (GtkPaned *paned, GtkWidget *child);</PRE ></TD ></TR ></TABLE ><P ><TT CLASS="LITERAL" >gtk_paned_add1()</TT > adds the child widget to the left or top half of the paned window. <TT CLASS="LITERAL" >gtk_paned_add2()</TT > adds the child widget to the right or bottom half of the paned window.</P ><P >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 <TT CLASS="LITERAL" >GTK_SHRINK</TT > 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.</P ><P ><SPAN CLASS="INLINEMEDIAOBJECT" ><IMG SRC="images/paned.png"></SPAN ></P ><TABLE BORDER="0" BGCOLOR="#E0E0E0" WIDTH="100%" ><TR ><TD ><PRE 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; }</PRE ></TD ></TR ></TABLE ></DIV ><DIV CLASS="NAVFOOTER" ><HR ALIGN="LEFT" WIDTH="100%"><TABLE SUMMARY="Footer navigation table" WIDTH="100%" BORDER="0" CELLPADDING="0" CELLSPACING="0" ><TR ><TD WIDTH="33%" ALIGN="left" VALIGN="top" ><A HREF="x1317.html" ACCESSKEY="P" ><<< Previous</A ></TD ><TD WIDTH="34%" ALIGN="center" VALIGN="top" ><A HREF="book1.html" ACCESSKEY="H" >Home</A ></TD ><TD WIDTH="33%" ALIGN="right" VALIGN="top" ><A HREF="x1352.html" ACCESSKEY="N" >Next >>></A ></TD ></TR ><TR ><TD WIDTH="33%" ALIGN="left" VALIGN="top" >Aspect Frames</TD ><TD WIDTH="34%" ALIGN="center" VALIGN="top" ><A HREF="c1226.html" ACCESSKEY="U" >Up</A ></TD ><TD WIDTH="33%" ALIGN="right" VALIGN="top" >Viewports</TD ></TR ></TABLE ></DIV ></BODY ></HTML >