/* Color Selector * * GtkColorSelection lets the user choose a color. GtkColorSelectionDialog is * a prebuilt dialog containing a GtkColorSelection. * */#include <gtk/gtk.h>static GtkWidget *window = NULL;static GtkWidget *da;static GdkColor color;static GtkWidget *frame;/* Expose callback for the drawing area */static gbooleanexpose_event_callback (GtkWidget *widget, GdkEventExpose *event, gpointer data){  if (widget->window)    {      GtkStyle *style;      style = gtk_widget_get_style (widget);      gdk_draw_rectangle (widget->window,                          style->bg_gc[GTK_STATE_NORMAL],                          TRUE,                          event->area.x, event->area.y,                          event->area.width, event->area.height);    }  return TRUE;}static voidchange_color_callback (GtkWidget *button,		       gpointer	  data){  GtkWidget *dialog;  GtkColorSelection *colorsel;  gint response;    dialog = gtk_color_selection_dialog_new ("Changing color");  gtk_window_set_transient_for (GTK_WINDOW (dialog), GTK_WINDOW (window));    colorsel = GTK_COLOR_SELECTION (GTK_COLOR_SELECTION_DIALOG (dialog)->colorsel);  gtk_color_selection_set_previous_color (colorsel, &color);  gtk_color_selection_set_current_color (colorsel, &color);  gtk_color_selection_set_has_palette (colorsel, TRUE);    response = gtk_dialog_run (GTK_DIALOG (dialog));  if (response == GTK_RESPONSE_OK)    {      gtk_color_selection_get_current_color (colorsel,					     &color);            gtk_widget_modify_bg (da, GTK_STATE_NORMAL, &color);    }    gtk_widget_destroy (dialog);}GtkWidget *do_colorsel (GtkWidget *do_widget){  GtkWidget *vbox;  GtkWidget *button;  GtkWidget *alignment;    if (!window)    {      color.red = 0;      color.blue = 65535;      color.green = 0;            window = gtk_window_new (GTK_WINDOW_TOPLEVEL);      gtk_window_set_screen (GTK_WINDOW (window),			     gtk_widget_get_screen (do_widget));      gtk_window_set_title (GTK_WINDOW (window), "Color Selection");      g_signal_connect (window, "destroy",			G_CALLBACK (gtk_widget_destroyed), &window);      gtk_container_set_border_width (GTK_CONTAINER (window), 8);      vbox = gtk_vbox_new (FALSE, 8);      gtk_container_set_border_width (GTK_CONTAINER (vbox), 8);      gtk_container_add (GTK_CONTAINER (window), vbox);      /*       * Create the color swatch area       */                  frame = gtk_frame_new (NULL);      gtk_frame_set_shadow_type (GTK_FRAME (frame), GTK_SHADOW_IN);      gtk_box_pack_start (GTK_BOX (vbox), frame, TRUE, TRUE, 0);      da = gtk_drawing_area_new ();      g_signal_connect (da, "expose_event",			G_CALLBACK (expose_event_callback), NULL);      /* set a minimum size */      gtk_widget_set_size_request (da, 200, 200);      /* set the color */      gtk_widget_modify_bg (da, GTK_STATE_NORMAL, &color);            gtk_container_add (GTK_CONTAINER (frame), da);      alignment = gtk_alignment_new (1.0, 0.5, 0.0, 0.0);            button = gtk_button_new_with_mnemonic ("_Change the above color");      gtk_container_add (GTK_CONTAINER (alignment), button);            gtk_box_pack_start (GTK_BOX (vbox), alignment, FALSE, FALSE, 0);            g_signal_connect (button, "clicked",			G_CALLBACK (change_color_callback), NULL);    }  if (!GTK_WIDGET_VISIBLE (window))    {      gtk_widget_show_all (window);    }  else    {      gtk_widget_destroy (window);      window = NULL;    }  return window;}