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<HTML><HEAD><TITLE>Example</TITLE><METANAME="GENERATOR"CONTENT="Modular DocBook HTML Stylesheet Version 1.49"><LINKREL="HOME"TITLE="GTK+ 1.2 Tutorial"HREF="gtk-tut.html"><LINKREL="UP"TITLE="List Widget"HREF="app-listwidget.html"><LINKREL="PREVIOUS"TITLE="Functions"HREF="sec-gtklistfunctions.html"><LINKREL="NEXT"TITLE="List Item Widget"HREF="sec-listitemwidget.html"></HEAD></head><body bgcolor="#FFFFFF" marginheight=0 marginwidth=0 width="100%"><table cellspacing=6 border=0 cellpadding=0 width="100%"> <tr> <td bgcolor="#FFFFFF" valign=top nowrap> <centeR><A HREF="/"><img src="/images/gtk-logo-rgb.gif" width=107 height=140 border=0></A> <font face="helvetica,lucidia" color="#000000"><BR><BR><b>GTK+<BR>The GIMP Toolkit</b></center><BR><table width=100% cellspacing=0 cellpadding=2 border=0><tr><td bgcolor="#000000"><table width=100% cellspacing=0 cellpadding=4 border=0><tr><td bgcolor="#AAAAEE" nowrap><B>General</B></td></tr><tr><td bgcolor="#FFFFFF" nowrap><A HREF="/">Introduction</A><BR><A HREF="/screenshots/">Screenshots</A><br><A HREF="/download/">Download</A><br><A HREF="/mailinglists.html">Mailing Lists</A><BR><A HREF="/bindings.html">Language Bindings</A><BR><A HREF="http://gtk.themes.org/">Themes</A><BR><A HREF="/bugs.html">Bug Tracker</A><BR></td></tr></table></td></tr></table><BR> <table width=100% cellspacing=0 cellpadding=2 border=0><tr><td bgcolor="#000000"><table width=100% cellspacing=0 cellpadding=4 border=0><tr><td bgcolor="#AAAAEE" nowrap><B>Documentation</B></td></tr><tr><td bgcolor="#FFFFFF" nowrap><A HREF="/faq/">FAQ</A><br><A HREF="/tutorial/">Tutorial</A><BR><A HREF="/api/">API Reference</A><br><A HREF="/books.html">Published Books</A><BR></td></tr></table></td></tr></table><BR> <table width=100% cellspacing=0 cellpadding=2 border=0><tr><td bgcolor="#000000"><table width=100% cellspacing=0 cellpadding=4 border=0><tr><td bgcolor="#AAAAEE" nowrap><B>Projects</B></td></tr><tr><td bgcolor="#FFFFFF" nowrap><A HREF="http://www.pango.org/">Pango</A><BR><A HREF="http://sources.redhat.com/inti/">Inti</A><BR><A HREF="http://www.gnome.org/">GNOME</A><BR><A HREF="http://user.sgic.fi/~tml/gimp/win32/">GTK+ for Win32</A><br><A HREF="http://people.redhat.com/sopwith/gtkfb/">GtkFB (Framebuffer)</A><br><A HREF="http://www.directfb.org/gtk.xml">GTK+ on DirectFB</A><BR><A HREF="/beos/">GTK+ for BeOS</A></td></tr></table></td></tr></table><BR> <table width=100% cellspacing=0 cellpadding=2 border=0><tr><td bgcolor="#000000"><table width=100% cellspacing=0 cellpadding=4 border=0><tr><td bgcolor="#AAAAEE" nowrap><B><B>Applications</B></B></td></tr><tr><td bgcolor="#FFFFFF" nowrap><A HREF="http://www.gimp.org/">GIMP</A><BR><A HREF="http://www.abiword.org/">Abiword</A><BR><A HREF="http://www.lysator.liu.se/~alla/dia/dia.html">Dia</A><BR><A HREF="http://glade.pn.org/">Glade</A><BR><A HREF="http://www.gnucash.org/">GnuCash</A><BR><A HREF="http://www.gnome.org/projects/gnumeric/">Gnumeric</A><BR><BR><A HREF="http://www.gnome.org/applist/">GNOME Software Map</A><br></td></tr></table></td></tr></table><BR> </td> <td bgcolor="#ffffff" valign=top width="99%"><font face="lucida,helvetica"><BODYCLASS="SECT1"BGCOLOR="#FFFFFF"TEXT="#000000"LINK="#0000FF"VLINK="#840084"ALINK="#0000FF"><DIVCLASS="NAVHEADER"><TABLEWIDTH="100%"BORDER="0"CELLPADDING="0"CELLSPACING="0"><TR><THCOLSPAN="3"ALIGN="center">GTK+ 1.2 Tutorial</TH></TR><TR><TDWIDTH="10%"ALIGN="left"VALIGN="bottom"><AHREF="sec-gtklistfunctions.html"><<< Previous</A></TD><TDWIDTH="80%"ALIGN="center"VALIGN="bottom">Appendix D. List Widget</TD><TDWIDTH="10%"ALIGN="right"VALIGN="bottom"><AHREF="sec-listitemwidget.html">Next >>></A></TD></TR></TABLE><HRALIGN="LEFT"WIDTH="100%"></DIV><DIVCLASS="SECT1"><H1CLASS="SECT1"><ANAME="SEC-GTKLISTEXAMPLE">D.3. Example</A></H1><P>Following is an example program that will print out the changes of theselection of a List, and lets you "arrest" list items into a prisonby selecting them with the rightmost mouse button.</P><TABLEBORDER="0"BGCOLOR="#E0E0E0"WIDTH="100%"><TR><TD><PRECLASS="PROGRAMLISTING">/* example-start list list.c *//* Include the GTK header files * Include stdio.h, we need that for the printf() function */#include <gtk/gtk.h>#include <stdio.h>/* This is our data identification string to store * data in list items */const gchar *list_item_data_key="list_item_data";/* prototypes for signal handler that we are going to connect * to the List widget */static void sigh_print_selection( GtkWidget *gtklist, gpointer func_data);static void sigh_button_event( GtkWidget *gtklist, GdkEventButton *event, GtkWidget *frame );/* Main function to set up the user interface */gint main( int argc, gchar *argv[] ){ GtkWidget *separator; GtkWidget *window; GtkWidget *vbox; GtkWidget *scrolled_window; GtkWidget *frame; GtkWidget *gtklist; GtkWidget *button; GtkWidget *list_item; GList *dlist; guint i; gchar buffer[64]; /* Initialize GTK (and subsequently GDK) */ gtk_init(&argc, &argv); /* Create a window to put all the widgets in * connect gtk_main_quit() to the "destroy" event of * the window to handle window manager close-window-events */ window=gtk_window_new(GTK_WINDOW_TOPLEVEL); gtk_window_set_title(GTK_WINDOW(window), "GtkList Example"); gtk_signal_connect(GTK_OBJECT(window), "destroy", GTK_SIGNAL_FUNC(gtk_main_quit), NULL); /* Inside the window we need a box to arrange the widgets * vertically */ vbox=gtk_vbox_new(FALSE, 5); gtk_container_set_border_width(GTK_CONTAINER(vbox), 5); gtk_container_add(GTK_CONTAINER(window), vbox); gtk_widget_show(vbox); /* This is the scrolled window to put the List widget inside */ scrolled_window=gtk_scrolled_window_new(NULL, NULL); gtk_widget_set_usize(scrolled_window, 250, 150); gtk_container_add(GTK_CONTAINER(vbox), scrolled_window); gtk_widget_show(scrolled_window); /* Create thekList widget. * Connect the sigh_print_selection() signal handler * function to the "selection_changed" signal of the List * to print out the selected items each time the selection * has changed */ gtklist=gtk_list_new(); gtk_scrolled_window_add_with_viewport( GTK_SCROLLED_WINDOW(scrolled_window), gtklist); gtk_widget_show(gtklist); gtk_signal_connect(GTK_OBJECT(gtklist), "selection_changed", GTK_SIGNAL_FUNC(sigh_print_selection), NULL); /* We create a "Prison" to put a list item in ;) */ frame=gtk_frame_new("Prison"); gtk_widget_set_usize(frame, 200, 50); gtk_container_set_border_width(GTK_CONTAINER(frame), 5); gtk_frame_set_shadow_type(GTK_FRAME(frame), GTK_SHADOW_OUT); gtk_container_add(GTK_CONTAINER(vbox), frame); gtk_widget_show(frame); /* Connect the sigh_button_event() signal handler to the List * which will handle the "arresting" of list items */ gtk_signal_connect(GTK_OBJECT(gtklist), "button_release_event", GTK_SIGNAL_FUNC(sigh_button_event), frame); /* Create a separator */ separator=gtk_hseparator_new(); gtk_container_add(GTK_CONTAINER(vbox), separator); gtk_widget_show(separator); /* Finally create a button and connect its "clicked" signal * to the destruction of the window */ button=gtk_button_new_with_label("Close"); gtk_container_add(GTK_CONTAINER(vbox), button); gtk_widget_show(button); gtk_signal_connect_object(GTK_OBJECT(button), "clicked", GTK_SIGNAL_FUNC(gtk_widget_destroy), GTK_OBJECT(window)); /* Now we create 5 list items, each having its own * label and add them to the List using gtk_container_add() * Also we query the text string from the label and * associate it with the list_item_data_key for each list item */ for (i=0; i<5; i++) { GtkWidget *label; gchar *string; sprintf(buffer, "ListItemContainer with Label #%d", i); label=gtk_label_new(buffer); list_item=gtk_list_item_new(); gtk_container_add(GTK_CONTAINER(list_item), label); gtk_widget_show(label); gtk_container_add(GTK_CONTAINER(gtklist), list_item); gtk_widget_show(list_item); gtk_label_get(GTK_LABEL(label), &string); gtk_object_set_data(GTK_OBJECT(list_item), list_item_data_key, string); } /* Here, we are creating another 5 labels, this time * we use gtk_list_item_new_with_label() for the creation * we can't query the text string from the label because * we don't have the labels pointer and therefore * we just associate the list_item_data_key of each * list item with the same text string. * For adding of the list items we put them all into a doubly * linked list (GList), and then add them by a single call to * gtk_list_append_items(). * Because we use g_list_prepend() to put the items into the * doubly linked list, their order will be descending (instead * of ascending when using g_list_append()) */ dlist=NULL; for (; i<10; i++) { sprintf(buffer, "List Item with Label %d", i); list_item=gtk_list_item_new_with_label(buffer); dlist=g_list_prepend(dlist, list_item); gtk_widget_show(list_item); gtk_object_set_data(GTK_OBJECT(list_item), list_item_data_key, "ListItem with integrated Label"); } gtk_list_append_items(GTK_LIST(gtklist), dlist); /* Finally we want to see the window, don't we? ;) */ gtk_widget_show(window); /* Fire up the main event loop of gtk */ gtk_main(); /* We get here after gtk_main_quit() has been called which * happens if the main window gets destroyed */ return(0);}/* This is the signal handler that got connected to button * press/release events of the List */void sigh_button_event( GtkWidget *gtklist, GdkEventButton *event, GtkWidget *frame ){ /* We only do something if the third (rightmost mouse button * was released */ if (event->type==GDK_BUTTON_RELEASE && event->button==3) { GList *dlist, *free_list; GtkWidget *new_prisoner; /* Fetch the currently selected list item which * will be our next prisoner ;) */ dlist=GTK_LIST(gtklist)->selection; if (dlist) new_prisoner=GTK_WIDGET(dlist->data); else new_prisoner=NULL; /* Look for already imprisoned list items, we * will put them back into the list. * Remember to free the doubly linked list that * gtk_container_children() returns */ dlist=gtk_container_children(GTK_CONTAINER(frame)); free_list=dlist; while (dlist) { GtkWidget *list_item; list_item=dlist->data; gtk_widget_reparent(list_item, gtklist); dlist=dlist->next; } g_list_free(free_list); /* If we have a new prisoner, remove him from the * List and put him into the frame "Prison". * We need to unselect the item first. */ if (new_prisoner) { GList static_dlist; static_dlist.data=new_prisoner; static_dlist.next=NULL; static_dlist.prev=NULL; gtk_list_unselect_child(GTK_LIST(gtklist), new_prisoner); gtk_widget_reparent(new_prisoner, frame); } }}/* This is the signal handler that gets called if List * emits the "selection_changed" signal */void sigh_print_selection( GtkWidget *gtklist, gpointer func_data ){ GList *dlist; /* Fetch the doubly linked list of selected items * of the List, remember to treat this as read-only! */ dlist=GTK_LIST(gtklist)->selection; /* If there are no selected items there is nothing more * to do than just telling the user so */ if (!dlist) { g_print("Selection cleared\n"); return; } /* Ok, we got a selection and so we print it */ g_print("The selection is a "); /* Get the list item from the doubly linked list * and then query the data associated with list_item_data_key. * We then just print it */ while (dlist) { GtkObject *list_item; gchar *item_data_string; list_item=GTK_OBJECT(dlist->data); item_data_string=gtk_object_get_data(list_item, list_item_data_key); g_print("%s ", item_data_string); dlist=dlist->next; } g_print("\n");}/* example-end */</PRE></TD></TR></TABLE></DIV><DIVCLASS="NAVFOOTER"><HRALIGN="LEFT"WIDTH="100%"><TABLEWIDTH="100%"BORDER="0"CELLPADDING="0"CELLSPACING="0"><TR><TDWIDTH="33%"ALIGN="left"VALIGN="top"><AHREF="sec-gtklistfunctions.html"><<< Previous</A></TD><TDWIDTH="34%"ALIGN="center"VALIGN="top"><AHREF="gtk-tut.html">Home</A></TD><TDWIDTH="33%"ALIGN="right"VALIGN="top"><AHREF="sec-listitemwidget.html">Next >>></A></TD></TR><TR><TDWIDTH="33%"ALIGN="left"VALIGN="top">Functions</TD><TDWIDTH="34%"ALIGN="center"VALIGN="top"><AHREF="app-listwidget.html">Up</A></TD><TDWIDTH="33%"ALIGN="right"VALIGN="top">List Item Widget</TD></TR></TABLE></DIV> </td> </tr></table> </td> </tr></table></body></BODY></HTML>⌨️ 快捷键说明
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