gtkcombo.c

gtk是linux一款强大的夸平台的图形化开发工具

  gtk_signal_handler_block (GTK_OBJECT (list), combo->list_change_id);
  if (list->selection)
    {
      text = gtk_combo_func (GTK_LIST_ITEM (list->selection->data));
      if (!text)
	text = "";
      gtk_entry_set_text (GTK_ENTRY (combo->entry), text);
    }
  gtk_signal_handler_unblock (GTK_OBJECT (list), combo->list_change_id);
}

static void
gtk_combo_update_list (GtkEntry * entry, GtkCombo * combo)
{
  GtkList *list = GTK_LIST (combo->list);
  GList *slist = list->selection;
  GtkListItem *li;

  gtk_grab_remove (GTK_WIDGET (combo));

  gtk_signal_handler_block (GTK_OBJECT (entry), combo->entry_change_id);
  if (slist && slist->data)
    gtk_list_unselect_child (list, GTK_WIDGET (slist->data));
  li = gtk_combo_find (combo);
  if (li)
    gtk_list_select_child (list, GTK_WIDGET (li));
  gtk_signal_handler_unblock (GTK_OBJECT (entry), combo->entry_change_id);
}

static gint
gtk_combo_button_press (GtkWidget * widget, GdkEvent * event, GtkCombo * combo)
{
  GtkWidget *child;

  child = gtk_get_event_widget (event);

  /* We don't ask for button press events on the grab widget, so
   *  if an event is reported directly to the grab widget, it must
   *  be on a window outside the application (and thus we remove
   *  the popup window). Otherwise, we check if the widget is a child
   *  of the grab widget, and only remove the popup window if it
   *  is not.
   */
  if (child != widget)
    {
      while (child)
	{
	  if (child == widget)
	    return FALSE;
	  child = child->parent;
	}
    }

  gtk_widget_hide (combo->popwin);
  gtk_grab_remove (combo->popwin);
  gdk_pointer_ungrab (event->button.time);

  return TRUE;
}

static gint
gtk_combo_button_release (GtkWidget * widget, GdkEvent * event, GtkCombo * combo)
{
  GtkWidget *child;

  if ((combo->current_button != 0) && (event->button.button == 1))
    {
      /* This was the initial button press */

      GdkEventCrossing tmp_event;

      combo->current_button = 0;

      if (widget != combo->button)
	gtk_widget_event (combo->button, event);

      /* Un-pre-hightlight */
      
      tmp_event.type = GDK_LEAVE_NOTIFY;
      tmp_event.window = combo->button->window;
      tmp_event.send_event = TRUE;
      tmp_event.subwindow = NULL;
      tmp_event.detail = GDK_NOTIFY_ANCESTOR;
      
      gtk_widget_event (combo->button, (GdkEvent *)&tmp_event);

      /* Check to see if we released inside the button */
      child = gtk_get_event_widget ((GdkEvent*) event);

      while (child && child != (combo->button))
	child = child->parent;

      if (child == combo->button)
	{
	  gtk_grab_add (combo->popwin);
	  gdk_pointer_grab (combo->popwin->window, TRUE,
			    GDK_BUTTON_PRESS_MASK | 
			    GDK_BUTTON_RELEASE_MASK |
			    GDK_POINTER_MOTION_MASK, 
			    NULL, NULL, GDK_CURRENT_TIME);
	  return FALSE;
	}
    }
  else
    {
      /* The user has clicked inside the popwin and released */

      if (GTK_WIDGET_HAS_GRAB (combo->popwin))
	{
	  gtk_grab_remove (combo->popwin);
	  gdk_pointer_ungrab (event->button.time);
	}
    }
  
  gtk_widget_hide (combo->popwin);

  return TRUE;
}

static gint         
gtk_combo_list_enter (GtkWidget        *widget,
		      GdkEventCrossing *event,
		      GtkCombo         *combo)
{
  GtkWidget *event_widget;

  event_widget = gtk_get_event_widget ((GdkEvent*) event);
  
  if ((event_widget == combo->list) &&
      (combo->current_button != 0) && 
      (!GTK_WIDGET_HAS_GRAB (combo->list)))
    {
      GdkEvent tmp_event;
      gint x, y;
      GdkModifierType mask;

      gtk_grab_remove (combo->popwin);

      /* Transfer the grab over to the list by synthesizing
       * a button press event
       */
      gdk_window_get_pointer (combo->list->window, &x, &y, &mask);

      tmp_event.button.type = GDK_BUTTON_PRESS;
      tmp_event.button.window = combo->list->window;
      tmp_event.button.send_event = TRUE;
      tmp_event.button.time = GDK_CURRENT_TIME; /* bad */
      tmp_event.button.x = x;
      tmp_event.button.y = y;
      /* We leave all the XInput fields unfilled here, in the expectation
       * that GtkList doesn't care.
       */
      tmp_event.button.button = combo->current_button;
      tmp_event.button.state = mask;

      gtk_widget_event (combo->list, &tmp_event);
    }

  return FALSE;
}

static int
gtk_combo_list_key_press (GtkWidget * widget, GdkEventKey * event, GtkCombo * combo)
{
  if (event->keyval == GDK_Escape)
    {
      if (GTK_WIDGET_HAS_GRAB (combo->popwin))
	{
	  gtk_grab_remove (combo->popwin);
	  gdk_pointer_ungrab (GDK_CURRENT_TIME);
	}
      else if (GTK_WIDGET_HAS_GRAB (combo->list))
	gtk_list_end_drag_selection (GTK_LIST (combo->list));
      gtk_widget_hide (combo->popwin);
      if (GTK_WIDGET_HAS_GRAB (combo->button))
	{
	  combo->current_button = 0;
	  GTK_BUTTON (combo->button)->in_button = FALSE;
	  gtk_button_released (GTK_BUTTON (combo->button));
	  gtk_grab_remove (combo->button);
	}
      return TRUE;
    }
  return FALSE;
}

static void
gtk_combo_init (GtkCombo * combo)
{
  GtkWidget *arrow;
  GtkWidget *frame;
  GtkWidget *event_box;
  GdkCursor *cursor;

  combo->case_sensitive = 0;
  combo->value_in_list = 0;
  combo->ok_if_empty = 1;
  combo->use_arrows = 1;
  combo->use_arrows_always = 0;
  combo->entry = gtk_entry_new ();
  combo->button = gtk_button_new ();
  combo->current_button = 0;
  arrow = gtk_arrow_new (GTK_ARROW_DOWN, GTK_SHADOW_OUT);
  gtk_widget_show (arrow);
  gtk_container_add (GTK_CONTAINER (combo->button), arrow);
  gtk_box_pack_start (GTK_BOX (combo), combo->entry, TRUE, TRUE, 0);
  gtk_box_pack_end (GTK_BOX (combo), combo->button, FALSE, FALSE, 0);
  GTK_WIDGET_UNSET_FLAGS (combo->button, GTK_CAN_FOCUS);
  gtk_widget_show (combo->entry);
  gtk_widget_show (combo->button);
  combo->entry_change_id = gtk_signal_connect (GTK_OBJECT (combo->entry), "changed",
			      (GtkSignalFunc) gtk_combo_update_list, combo);
  gtk_signal_connect (GTK_OBJECT (combo->entry), "key_press_event",
		      (GtkSignalFunc) gtk_combo_entry_key_press, combo);
  gtk_signal_connect_after (GTK_OBJECT (combo->entry), "focus_out_event",
			    (GtkSignalFunc) gtk_combo_entry_focus_out, combo);
  combo->activate_id = gtk_signal_connect (GTK_OBJECT (combo->entry), "activate",
		      (GtkSignalFunc) gtk_combo_activate, combo);
  gtk_signal_connect_after (GTK_OBJECT (combo->button), "button_press_event",
			    (GtkSignalFunc) gtk_combo_popup_button_press, combo);
  /*gtk_signal_connect_after (GTK_OBJECT (combo->button), "button_release_event",
    (GtkSignalFunc) gtk_combo_button_release, combo);*/
  gtk_signal_connect (GTK_OBJECT (combo->button), "leave_notify_event",
		      (GtkSignalFunc) gtk_combo_popup_button_leave, combo);
  /*gtk_signal_connect(GTK_OBJECT(combo->button), "clicked",
     (GtkSignalFunc)prelight_bug, combo); */

  combo->popwin = gtk_window_new (GTK_WINDOW_POPUP);
  gtk_widget_ref (combo->popwin);
  gtk_window_set_policy (GTK_WINDOW (combo->popwin), 1, 1, 0);
  
  gtk_widget_set_events (combo->popwin, GDK_KEY_PRESS_MASK);

  event_box = gtk_event_box_new ();
  gtk_container_add (GTK_CONTAINER (combo->popwin), event_box);
  gtk_widget_show (event_box);

  gtk_widget_realize (event_box);
  cursor = gdk_cursor_new (GDK_TOP_LEFT_ARROW);
  gdk_window_set_cursor (event_box->window, cursor);
  gdk_cursor_destroy (cursor);

  frame = gtk_frame_new (NULL);
  gtk_container_add (GTK_CONTAINER (event_box), frame);
  gtk_frame_set_shadow_type (GTK_FRAME (frame), GTK_SHADOW_OUT);
  gtk_widget_show (frame);

  combo->popup = gtk_scrolled_window_new (NULL, NULL);
  gtk_scrolled_window_set_policy (GTK_SCROLLED_WINDOW (combo->popup),
				  GTK_POLICY_AUTOMATIC, GTK_POLICY_AUTOMATIC);
  GTK_WIDGET_UNSET_FLAGS (GTK_SCROLLED_WINDOW (combo->popup)->hscrollbar, GTK_CAN_FOCUS);
  GTK_WIDGET_UNSET_FLAGS (GTK_SCROLLED_WINDOW (combo->popup)->vscrollbar, GTK_CAN_FOCUS);
  gtk_container_add (GTK_CONTAINER (frame), combo->popup);
  gtk_widget_show (combo->popup);

  combo->list = gtk_list_new ();
  /* We'll use enter notify events to figure out when to transfer
   * the grab to the list
   */
  gtk_widget_set_events (combo->list, GDK_ENTER_NOTIFY_MASK);

  gtk_list_set_selection_mode(GTK_LIST(combo->list), GTK_SELECTION_BROWSE);
  gtk_scrolled_window_add_with_viewport (GTK_SCROLLED_WINDOW (combo->popup), combo->list);
  gtk_container_set_focus_vadjustment (GTK_CONTAINER (combo->list),
				       gtk_scrolled_window_get_vadjustment (GTK_SCROLLED_WINDOW (combo->popup)));
  gtk_container_set_focus_hadjustment (GTK_CONTAINER (combo->list),
				       gtk_scrolled_window_get_hadjustment (GTK_SCROLLED_WINDOW (combo->popup)));
  gtk_widget_show (combo->list);

  combo->list_change_id = gtk_signal_connect (GTK_OBJECT (combo->list), "selection_changed",
			     (GtkSignalFunc) gtk_combo_update_entry, combo);
  gtk_signal_connect (GTK_OBJECT (combo->popwin), "key_press_event",
		      (GtkSignalFunc) gtk_combo_list_key_press, combo);
  gtk_signal_connect (GTK_OBJECT (combo->popwin), "button_press_event",
		      GTK_SIGNAL_FUNC (gtk_combo_button_press), combo);

  gtk_signal_connect_after (GTK_OBJECT (combo->list), "button_release_event",
			    GTK_SIGNAL_FUNC (gtk_combo_button_release), combo);
  /* We connect here on the button, because we'll have a grab on it
   * when the event occurs. But we are actually interested in enters
   * for the combo->list.
   */
  gtk_signal_connect (GTK_OBJECT (combo->button), "enter_notify_event",
		      GTK_SIGNAL_FUNC (gtk_combo_list_enter), combo);
}

guint
gtk_combo_get_type (void)
{
  static guint combo_type = 0;

  if (!combo_type)
    {
      static const GtkTypeInfo combo_info =
      {
	"GtkCombo",
	sizeof (GtkCombo),
	sizeof (GtkComboClass),
	(GtkClassInitFunc) gtk_combo_class_init,
	(GtkObjectInitFunc) gtk_combo_init,
	/* reserved_1 */ NULL,
	/* reserved_2 */ NULL,
        (GtkClassInitFunc) NULL,
      };
      combo_type = gtk_type_unique (gtk_hbox_get_type (), &combo_info);
    }
  return combo_type;
}

GtkWidget *
gtk_combo_new (void)
{
  return GTK_WIDGET (gtk_type_new (gtk_combo_get_type ()));
}

void
gtk_combo_set_value_in_list (GtkCombo * combo, gint val, gint ok_if_empty)
{
  g_return_if_fail (combo != NULL);
  g_return_if_fail (GTK_IS_COMBO (combo));

  combo->value_in_list = val;
  combo->ok_if_empty = ok_if_empty;
}

void
gtk_combo_set_case_sensitive (GtkCombo * combo, gint val)
{
  g_return_if_fail (combo != NULL);
  g_return_if_fail (GTK_IS_COMBO (combo));

  combo->case_sensitive = val;
}

void
gtk_combo_set_use_arrows (GtkCombo * combo, gint val)
{
  g_return_if_fail (combo != NULL);
  g_return_if_fail (GTK_IS_COMBO (combo));

  combo->use_arrows = val;
}

void
gtk_combo_set_use_arrows_always (GtkCombo * combo, gint val)
{
  g_return_if_fail (combo != NULL);
  g_return_if_fail (GTK_IS_COMBO (combo));

  combo->use_arrows_always = val;
  combo->use_arrows = 1;
}

void
gtk_combo_set_popdown_strings (GtkCombo * combo, GList * strings)
{
  GList *list;
  GtkWidget *li;

  g_return_if_fail (combo != NULL);
  g_return_if_fail (GTK_IS_COMBO (combo));
  g_return_if_fail (strings != NULL);

  gtk_list_clear_items (GTK_LIST (combo->list), 0, -1);
  list = strings;
  while (list)
    {
      li = gtk_list_item_new_with_label ((gchar *) list->data);
      gtk_widget_show (li);
      gtk_container_add (GTK_CONTAINER (combo->list), li);
      list = list->next;
    }
}

static void
gtk_combo_item_destroy (GtkObject * object)
{
  gchar *key;

  key = gtk_object_get_data (object, gtk_combo_string_key);
  if (key)
    g_free (key);
}

void
gtk_combo_set_item_string (GtkCombo * combo, GtkItem * item, const gchar * item_value)
{
  gchar *val;
  gint connected = 0;

  g_return_if_fail (combo != NULL);
  g_return_if_fail (GTK_IS_COMBO (combo));
  g_return_if_fail (item != NULL);

  val = gtk_object_get_data (GTK_OBJECT (item), gtk_combo_string_key);
  if (val) 
    {
      g_free (val);
      connected = 1;
    }
  if (item_value)
    {
      val = g_strdup(item_value);
      gtk_object_set_data (GTK_OBJECT (item), gtk_combo_string_key, val);
      if (!connected)
        gtk_signal_connect (GTK_OBJECT (item), "destroy",
			  (GtkSignalFunc) gtk_combo_item_destroy, val);
    }
  else 
    {
      gtk_object_set_data (GTK_OBJECT (item), gtk_combo_string_key, NULL);
      if (connected)
	gtk_signal_disconnect_by_data(GTK_OBJECT (item), val);
    }
}

static void
gtk_combo_size_allocate (GtkWidget     *widget,
			 GtkAllocation *allocation)
{
  GtkCombo *combo;

  g_return_if_fail (widget != NULL);
  g_return_if_fail (GTK_IS_COMBO (widget));
  g_return_if_fail (allocation != NULL);

  GTK_WIDGET_CLASS (parent_class)->size_allocate (widget, allocation);
  
  combo = GTK_COMBO (widget);

  if (combo->entry->allocation.height > combo->entry->requisition.height)
    {
      GtkAllocation button_allocation;

      button_allocation = combo->button->allocation;
      button_allocation.height = combo->entry->requisition.height;
      button_allocation.y = combo->entry->allocation.y + 
	(combo->entry->allocation.height - combo->entry->requisition.height) 
	/ 2;
      gtk_widget_size_allocate (combo->button, &button_allocation);
    }
}

void
gtk_combo_disable_activate (GtkCombo* combo)
{
  g_return_if_fail (combo != NULL);
  g_return_if_fail (GTK_IS_COMBO (combo));

  if ( combo->activate_id ) {
    gtk_signal_disconnect(GTK_OBJECT(combo->entry), combo->activate_id);
    combo->activate_id = 0;
  }
}