mirror of
https://gitlab.gnome.org/GNOME/gtk.git
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285 lines
8.6 KiB
C
285 lines
8.6 KiB
C
/* This file extracted from the GTK tutorial. */
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/* list.c */
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/* include the gtk+ header files
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* include stdio.h, we need that for the printf() function
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*/
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#include <gtk/gtk.h>
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#include <stdio.h>
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/* this is our data identification string to store
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* data in list items
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*/
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const gchar *list_item_data_key="list_item_data";
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/* prototypes for signal handler that we are going to connect
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* to the GtkList widget
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*/
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static void sigh_print_selection (GtkWidget *gtklist,
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gpointer func_data);
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static void sigh_button_event (GtkWidget *gtklist,
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GdkEventButton *event,
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GtkWidget *frame);
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/* main function to set up the user interface */
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gint main (int argc, gchar *argv[])
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{
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GtkWidget *separator;
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GtkWidget *window;
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GtkWidget *vbox;
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GtkWidget *scrolled_window;
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GtkWidget *frame;
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GtkWidget *gtklist;
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GtkWidget *button;
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GtkWidget *list_item;
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GList *dlist;
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guint i;
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gchar buffer[64];
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/* initialize gtk+ (and subsequently gdk) */
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gtk_init(&argc, &argv);
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/* create a window to put all the widgets in
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* connect gtk_main_quit() to the "destroy" event of
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* the window to handle window manager close-window-events
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*/
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window=gtk_window_new(GTK_WINDOW_TOPLEVEL);
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gtk_window_set_title(GTK_WINDOW(window), "GtkList Example");
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gtk_signal_connect(GTK_OBJECT(window),
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"destroy",
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GTK_SIGNAL_FUNC(gtk_main_quit),
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NULL);
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/* inside the window we need a box to arrange the widgets
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* vertically */
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vbox=gtk_vbox_new(FALSE, 5);
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gtk_container_border_width(GTK_CONTAINER(vbox), 5);
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gtk_container_add(GTK_CONTAINER(window), vbox);
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gtk_widget_show(vbox);
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/* this is the scolled window to put the GtkList widget inside */
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scrolled_window=gtk_scrolled_window_new(NULL, NULL);
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gtk_widget_set_usize(scrolled_window, 250, 150);
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gtk_container_add(GTK_CONTAINER(vbox), scrolled_window);
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gtk_widget_show(scrolled_window);
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/* create the GtkList widget
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* connect the sigh_print_selection() signal handler
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* function to the "selection_changed" signal of the GtkList
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* to print out the selected items each time the selection
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* has changed */
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gtklist=gtk_list_new();
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gtk_container_add(GTK_CONTAINER(scrolled_window), gtklist);
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gtk_widget_show(gtklist);
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gtk_signal_connect(GTK_OBJECT(gtklist),
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"selection_changed",
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GTK_SIGNAL_FUNC(sigh_print_selection),
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NULL);
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/* we create a "Prison" to put a list item in ;)
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*/
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frame=gtk_frame_new("Prison");
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gtk_widget_set_usize(frame, 200, 50);
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gtk_container_border_width(GTK_CONTAINER(frame), 5);
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gtk_frame_set_shadow_type(GTK_FRAME(frame), GTK_SHADOW_OUT);
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gtk_container_add(GTK_CONTAINER(vbox), frame);
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gtk_widget_show(frame);
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/* connect the sigh_button_event() signal handler to the GtkList
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* wich will handle the "arresting" of list items
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*/
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gtk_signal_connect(GTK_OBJECT(gtklist),
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"button_release_event",
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GTK_SIGNAL_FUNC(sigh_button_event),
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frame);
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/* create a separator
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*/
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separator=gtk_hseparator_new();
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gtk_container_add(GTK_CONTAINER(vbox), separator);
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gtk_widget_show(separator);
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/* finaly create a button and connect it<69>s "clicked" signal
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* to the destroyment of the window
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*/
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button=gtk_button_new_with_label("Close");
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gtk_container_add(GTK_CONTAINER(vbox), button);
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gtk_widget_show(button);
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gtk_signal_connect_object(GTK_OBJECT(button),
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"clicked",
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GTK_SIGNAL_FUNC(gtk_widget_destroy),
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GTK_OBJECT(window));
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/* now we create 5 list items, each having it<69>s own
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* label and add them to the GtkList using gtk_container_add()
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* also we query the text string from the label and
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* associate it with the list_item_data_key for each list item
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*/
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for (i=0; i<5; i++) {
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GtkWidget *label;
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gchar *string;
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sprintf(buffer, "ListItemContainer with Label #%d", i);
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label=gtk_label_new(buffer);
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list_item=gtk_list_item_new();
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gtk_container_add(GTK_CONTAINER(list_item), label);
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gtk_widget_show(label);
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gtk_container_add(GTK_CONTAINER(gtklist), list_item);
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gtk_widget_show(list_item);
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gtk_label_get(GTK_LABEL(label), &string);
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gtk_object_set_data(GTK_OBJECT(list_item),
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list_item_data_key,
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string);
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}
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/* here, we are creating another 5 labels, this time
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* we use gtk_list_item_new_with_label() for the creation
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* we can<61>t query the text string from the label because
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* we don<6F>t have the labels pointer and therefore
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* we just associate the list_item_data_key of each
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* list item with the same text string
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* for adding of the list items we put them all into a doubly
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* linked list (GList), and then add them by a single call to
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* gtk_list_append_items()
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* because we use g_list_prepend() to put the items into the
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* doubly linked list, their order will be descending (instead
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* of ascending when using g_list_append())
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*/
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dlist=NULL;
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for (; i<10; i++) {
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sprintf(buffer, "List Item with Label %d", i);
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list_item=gtk_list_item_new_with_label(buffer);
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dlist=g_list_prepend(dlist, list_item);
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gtk_widget_show(list_item);
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gtk_object_set_data(GTK_OBJECT(list_item),
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list_item_data_key,
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"ListItem with integrated Label");
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}
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gtk_list_append_items(GTK_LIST(gtklist), dlist);
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/* finaly we want to see the window, don<6F>t we? ;)
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*/
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gtk_widget_show(window);
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/* fire up the main event loop of gtk
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*/
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gtk_main();
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/* we get here after gtk_main_quit() has been called which
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* happens if the main window gets destroyed
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*/
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return 0;
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}
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/* this is the signal handler that got connected to button
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* press/release events of the GtkList
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*/
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void
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sigh_button_event (GtkWidget *gtklist,
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GdkEventButton *event,
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GtkWidget *frame)
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{
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/* we only do something if the third (rightmost mouse button
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* was released
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*/
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if (event->type==GDK_BUTTON_RELEASE &&
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event->button==3) {
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GList *dlist, *free_list;
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GtkWidget *new_prisoner;
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/* fetch the currently selected list item which
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* will be our next prisoner ;)
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*/
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dlist=GTK_LIST(gtklist)->selection;
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if (dlist)
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new_prisoner=GTK_WIDGET(dlist->data);
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else
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new_prisoner=NULL;
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/* look for already prisoned list items, we
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* will put them back into the list
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* remember to free the doubly linked list that
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* gtk_container_children() returns
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*/
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dlist=gtk_container_children(GTK_CONTAINER(frame));
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free_list=dlist;
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while (dlist) {
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GtkWidget *list_item;
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list_item=dlist->data;
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gtk_widget_reparent(list_item, gtklist);
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dlist=dlist->next;
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}
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g_list_free(free_list);
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/* if we have a new prisoner, remove him from the
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* GtkList and put him into the frame "Prison"
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* we need to unselect the item before
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*/
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if (new_prisoner) {
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GList static_dlist;
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static_dlist.data=new_prisoner;
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static_dlist.next=NULL;
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static_dlist.prev=NULL;
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gtk_list_unselect_child(GTK_LIST(gtklist),
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new_prisoner);
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gtk_widget_reparent(new_prisoner, frame);
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}
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}
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}
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/* this is the signal handler that gets called if GtkList
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* emits the "selection_changed" signal
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*/
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void
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sigh_print_selection (GtkWidget *gtklist,
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gpointer func_data)
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{
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GList *dlist;
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/* fetch the doubly linked list of selected items
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* of the GtkList, remember to treat this as read-only!
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*/
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dlist=GTK_LIST(gtklist)->selection;
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/* if there are no selected items there is nothing more
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* to do than just telling the user so
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*/
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if (!dlist) {
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g_print("Selection cleared\n");
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return;
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}
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/* ok, we got a selection and so we print it
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*/
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g_print("The selection is a ");
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/* get the list item from the doubly linked list
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* and then query the data associated with list_item_data_key
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* we then just print it
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*/
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while (dlist) {
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GtkObject *list_item;
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gchar *item_data_string;
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list_item=GTK_OBJECT(dlist->data);
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item_data_string=gtk_object_get_data(list_item,
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list_item_data_key);
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g_print("%s ", item_data_string);
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dlist=dlist->next;
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}
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g_print("\n");
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}
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