text: /*
   * testoffscreen.c
   */
  
  #include <math.h>
  #include <string.h>
  #include <gtk/gtk.h>
  #include "gtkoffscreenbox.h"
  
  
  static void
  combo_changed_cb (GtkWidget *combo,
  		  gpointer   data)
  {
    GtkWidget *label = GTK_WIDGET (data);
    gint active;
  
    active = gtk_combo_box_get_active (GTK_COMBO_BOX (combo));
  
    gtk_label_set_ellipsize (GTK_LABEL (label), (PangoEllipsizeMode)active);
  }
  
  static gboolean
  layout_draw_handler (GtkWidget *widget,
                       cairo_t   *cr)
  {
    GtkLayout *layout = GTK_LAYOUT (widget);
    GdkWindow *bin_window = gtk_layout_get_bin_window (layout);
    GdkRectangle clip;
  
    gint i, j, x, y;
    gint imin, imax, jmin, jmax;
  
    if (!gtk_cairo_should_draw_window (cr, bin_window))
      return FALSE;
  
    gdk_window_get_position (bin_window, &x, &y);
    cairo_translate (cr, x, y);
  
    gdk_cairo_get_clip_rectangle (cr, &clip);
  
    imin = (clip.x) / 10;
    imax = (clip.x + clip.width + 9) / 10;
  
    jmin = (clip.y) / 10;
    jmax = (clip.y + clip.height + 9) / 10;
  
    for (i = imin; i < imax; i++)
      for (j = jmin; j < jmax; j++)
        if ((i + j) % 2)
            cairo_rectangle (cr,
                             10 * i, 10 * j,
                             1 + i % 10, 1 + j % 10);
  
    cairo_fill (cr);
  
    return FALSE;
  }
  
  static gboolean
  scroll_layout (gpointer data)
  {
    GtkWidget *layout = data;
    GtkAdjustment *adj;
  
    adj = gtk_scrollable_get_hadjustment (GTK_SCROLLABLE (layout));
    gtk_adjustment_set_value (adj, gtk_adjustment_get_value (adj) + 5.0);
    return G_SOURCE_CONTINUE;
  }
  
  static guint layout_timeout;
  
  static void
  create_layout (GtkWidget *vbox)
  {
    GtkAdjustment *hadjustment, *vadjustment;
    GtkLayout *layout;
    GtkWidget *layout_widget;
    GtkWidget *scrolledwindow;
    GtkWidget *button;
    gchar buf[16];
    gint i, j;
  
    scrolledwindow = gtk_scrolled_window_new (NULL, NULL);
    gtk_scrolled_window_set_shadow_type (GTK_SCROLLED_WINDOW (scrolledwindow),
  				       GTK_SHADOW_IN);
    gtk_scrolled_window_set_placement (GTK_SCROLLED_WINDOW (scrolledwindow),
  				     GTK_CORNER_TOP_RIGHT);
  
    gtk_box_pack_start (GTK_BOX (vbox), scrolledwindow, TRUE, TRUE, 0);
  
    layout_widget = gtk_layout_new (NULL, NULL);
    layout = GTK_LAYOUT (layout_widget);
    gtk_container_add (GTK_CONTAINER (scrolledwindow), layout_widget);
  
    /* We set step sizes here since GtkLayout does not set
     * them itself.
     */
    hadjustment = gtk_scrollable_get_hadjustment (GTK_SCROLLABLE (layout));
    vadjustment = gtk_scrollable_get_vadjustment (GTK_SCROLLABLE (layout));
    gtk_adjustment_set_step_increment (hadjustment, 10.0);
    gtk_adjustment_set_step_increment (vadjustment, 10.0);
    gtk_scrollable_set_hadjustment (GTK_SCROLLABLE (layout), hadjustment);
    gtk_scrollable_set_vadjustment (GTK_SCROLLABLE (layout), vadjustment);
  
    gtk_widget_set_events (layout_widget, GDK_EXPOSURE_MASK);
    g_signal_connect (layout, "draw",
  		    G_CALLBACK (layout_draw_handler),
                      NULL);
  
    gtk_layout_set_size (layout, 1600, 128000);
  
    for (i = 0 ; i < 16 ; i++)
      for (j = 0 ; j < 16 ; j++)
        {
  	g_snprintf (buf, sizeof (buf), "Button %d, %d", i, j);
  
  	if ((i + j) % 2)
  	  button = gtk_button_new_with_label (buf);
  	else
  	  button = gtk_label_new (buf);
  
  	gtk_layout_put (layout, button,	j * 100, i * 100);
        }
  
    for (i = 16; i < 1280; i++)
      {
        g_snprintf (buf, sizeof (buf), "Button %d, %d", i, 0);
  
        if (i % 2)
  	button = gtk_button_new_with_label (buf);
        else
  	button = gtk_label_new (buf);
  
        gtk_layout_put (layout, button, 0, i * 100);
      }
  
    layout_timeout = g_timeout_add (1000, scroll_layout, layout);
  }
  
  static void
  create_treeview (GtkWidget *vbox)
  {
    GtkWidget *scrolledwindow;
    GtkListStore *store;
    GtkWidget *tree_view;
    GtkIconTheme *icon_theme;
    GList *icon_names;
    GList *list;
  
    scrolledwindow = gtk_scrolled_window_new (NULL, NULL);
    gtk_scrolled_window_set_shadow_type (GTK_SCROLLED_WINDOW (scrolledwindow),
  				       GTK_SHADOW_IN);
  
    gtk_box_pack_start (GTK_BOX (vbox), scrolledwindow, TRUE, TRUE, 0);
  
    store = gtk_list_store_new (2, G_TYPE_STRING, G_TYPE_STRING);
    tree_view = gtk_tree_view_new_with_model (GTK_TREE_MODEL (store));
    g_object_unref (store);
  
    gtk_container_add (GTK_CONTAINER (scrolledwindow), tree_view);
  
    gtk_tree_view_insert_column_with_attributes (GTK_TREE_VIEW (tree_view), -1,
                                                 "Icon",
                                                 gtk_cell_renderer_pixbuf_new (),
                                                 "icon-name", 0,
                                                 NULL);
    gtk_tree_view_insert_column_with_attributes (GTK_TREE_VIEW (tree_view), -1,
                                                 "Label",
                                                 gtk_cell_renderer_text_new (),
                                                 "text", 1,
                                                 NULL);
  
    icon_theme = gtk_icon_theme_get_for_screen (gtk_widget_get_screen (vbox));
    icon_names = gtk_icon_theme_list_icons (icon_theme, NULL);
    icon_names = g_list_sort (icon_names, (GCompareFunc) strcmp);
  
    for (list = icon_names; list; list = g_list_next (list))
      {
        const gchar *name = list->data;
  
        gtk_list_store_insert_with_values (store, NULL, -1,
                                           0, name,
                                           1, name,
                                           -1);
      }
  
    g_list_free_full (icon_names, g_free);
  }
  
  static GtkWidget *
  create_widgets (void)
  {
    GtkWidget *main_hbox, *main_vbox;
    GtkWidget *vbox, *hbox, *label, *combo, *entry, *button, *cb;
    GtkWidget *sw, *text_view;
  
    main_vbox = gtk_box_new (GTK_ORIENTATION_VERTICAL, 0);
  
    main_hbox = gtk_box_new (GTK_ORIENTATION_HORIZONTAL, 0);
    gtk_box_pack_start (GTK_BOX (main_vbox), main_hbox, TRUE, TRUE, 0);
  
    vbox = gtk_box_new (GTK_ORIENTATION_VERTICAL, 0);
    gtk_box_pack_start (GTK_BOX (main_hbox), vbox, TRUE, TRUE, 0);
  
    hbox = gtk_box_new (GTK_ORIENTATION_HORIZONTAL, 0);
    gtk_box_pack_start (GTK_BOX (vbox), hbox, FALSE, FALSE, 0);
  
    label = gtk_label_new ("This label may be ellipsized\nto make it fit.");
    gtk_box_pack_start (GTK_BOX (hbox), label, TRUE, TRUE, 0);
  
    combo = gtk_combo_box_text_new ();
    gtk_combo_box_text_append_text (GTK_COMBO_BOX_TEXT (combo), "NONE");
    gtk_combo_box_text_append_text (GTK_COMBO_BOX_TEXT (combo), "START");
    gtk_combo_box_text_append_text (GTK_COMBO_BOX_TEXT (combo), "MIDDLE");
    gtk_combo_box_text_append_text (GTK_COMBO_BOX_TEXT (combo), "END");
    gtk_combo_box_set_active (GTK_COMBO_BOX (combo), 0);
    gtk_box_pack_start (GTK_BOX (hbox), combo, TRUE, TRUE, 0);
  
    g_signal_connect (combo, "changed",
                      G_CALLBACK (combo_changed_cb),
                      label);
  
    entry = gtk_entry_new ();
    gtk_entry_set_text (GTK_ENTRY (entry), "an entry - lots of text.... lots of text.... lots of text.... lots of text.... ");
    gtk_box_pack_start (GTK_BOX (vbox), entry, FALSE, FALSE, 0);
  
    label = gtk_label_new ("Label after entry.");
    gtk_label_set_selectable (GTK_LABEL (label), TRUE);
    gtk_box_pack_start (GTK_BOX (vbox), label, TRUE, TRUE, 0);
  
    button = gtk_button_new_with_label ("Button");
    gtk_box_pack_start (GTK_BOX (vbox), button, TRUE, TRUE, 0);
  
    button = gtk_check_button_new_with_mnemonic ("_Check button");
    gtk_box_pack_start (GTK_BOX (vbox), button, FALSE, FALSE, 0);
  
    cb = gtk_combo_box_text_new ();
    entry = gtk_entry_new ();
    gtk_widget_show (entry);
    gtk_container_add (GTK_CONTAINER (cb), entry);
  
    gtk_combo_box_text_append_text (GTK_COMBO_BOX_TEXT (cb), "item0");
    gtk_combo_box_text_append_text (GTK_COMBO_BOX_TEXT (cb), "item1");
    gtk_combo_box_text_append_text (GTK_COMBO_BOX_TEXT (cb), "item1");
    gtk_combo_box_text_append_text (GTK_COMBO_BOX_TEXT (cb), "item2");
    gtk_combo_box_text_append_text (GTK_COMBO_BOX_TEXT (cb), "item2");
    gtk_combo_box_text_append_text (GTK_COMBO_BOX_TEXT (cb), "item2");
    gtk_entry_set_text (GTK_ENTRY (entry), "hello world ♥ foo");
    gtk_editable_select_region (GTK_EDITABLE (entry), 0, -1);
    gtk_box_pack_start (GTK_BOX (vbox), cb, TRUE, TRUE, 0);
  
    sw = gtk_scrolled_window_new (NULL, NULL);
    gtk_scrolled_window_set_policy (GTK_SCROLLED_WINDOW (sw),
  				  GTK_POLICY_AUTOMATIC,
  				  GTK_POLICY_AUTOMATIC);
    text_view = gtk_text_view_new ();
    gtk_box_pack_start (GTK_BOX (vbox), sw, TRUE, TRUE, 0);
    gtk_container_add (GTK_CONTAINER (sw), text_view);
  
    create_layout (vbox);
  
    create_treeview (main_hbox);
  
    return main_vbox;
  }
  
  
  static void
  scale_changed (GtkRange        *range,
  	       GtkOffscreenBox *offscreen_box)
  {
    gtk_offscreen_box_set_angle (offscreen_box, gtk_range_get_value (range));
  }
  
  static GtkWidget *scale = NULL;
  
  static void
  remove_clicked (GtkButton *button,
                  GtkWidget *widget)
  {
    gtk_widget_destroy (widget);
    g_source_remove (layout_timeout);
  
    gtk_widget_set_sensitive (GTK_WIDGET (button), FALSE);
    gtk_widget_set_sensitive (scale, FALSE);
  }
  
  int
  main (int   argc,
        char *argv[])
  {
    GtkWidget *window, *widget, *vbox, *button;
    GtkWidget *offscreen = NULL;
    gboolean use_offscreen;
  
    gtk_init (&argc, &argv);
  
    use_offscreen = argc == 1;
  
    window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
    gtk_window_set_default_size (GTK_WINDOW (window), 300,300);
  
    g_signal_connect (window, "destroy",
                      G_CALLBACK (gtk_main_quit),
                      NULL);
  
    vbox = gtk_box_new (GTK_ORIENTATION_VERTICAL, 0);
    gtk_container_add (GTK_CONTAINER (window), vbox);
  
    scale = gtk_scale_new_with_range (GTK_ORIENTATION_HORIZONTAL,
                                      0, G_PI * 2, 0.01);
    gtk_box_pack_start (GTK_BOX (vbox), scale, FALSE, FALSE, 0);
  
    button = gtk_button_new_with_label ("Remove child 2");
    gtk_box_pack_start (GTK_BOX (vbox), button, FALSE, FALSE, 0);
  
    if (use_offscreen)
      {
        offscreen = gtk_offscreen_box_new ();
  
        g_signal_connect (scale, "value_changed",
                          G_CALLBACK (scale_changed),
                          offscreen);
      }
    else
      {
        offscreen = gtk_paned_new (GTK_ORIENTATION_VERTICAL);
      }
  
    gtk_box_pack_start (GTK_BOX (vbox), offscreen, TRUE, TRUE, 0);
  
    widget = create_widgets ();
    if (use_offscreen)
      gtk_offscreen_box_add1 (GTK_OFFSCREEN_BOX (offscreen),
  			    widget);
    else
      gtk_paned_add1 (GTK_PANED (offscreen), widget);
  
    widget = create_widgets ();
    if (1)
      {
        GtkWidget *widget2, *box2, *offscreen2;
  
        offscreen2 = gtk_offscreen_box_new ();
        gtk_box_pack_start (GTK_BOX (widget), offscreen2, FALSE, FALSE, 0);
  
        g_signal_connect (scale, "value_changed",
                          G_CALLBACK (scale_changed),
                          offscreen2);
  
        box2 = gtk_box_new (GTK_ORIENTATION_VERTICAL, 0);
        gtk_offscreen_box_add2 (GTK_OFFSCREEN_BOX (offscreen2), box2);
  
        widget2 = gtk_button_new_with_label ("Offscreen in offscreen");
        gtk_box_pack_start (GTK_BOX (box2), widget2, FALSE, FALSE, 0);
  
        widget2 = gtk_entry_new ();
        gtk_entry_set_text (GTK_ENTRY (widget2), "Offscreen in offscreen");
        gtk_box_pack_start (GTK_BOX (box2), widget2, FALSE, FALSE, 0);
      }
  
    if (use_offscreen)
      gtk_offscreen_box_add2 (GTK_OFFSCREEN_BOX (offscreen), widget);
    else
      gtk_paned_add2 (GTK_PANED (offscreen), widget);
  
    gtk_widget_show_all (window);
  
    g_signal_connect (G_OBJECT (button), "clicked",
                      G_CALLBACK (remove_clicked),
                      widget);
  
    gtk_main ();
  
    return 0;
  }
  