path: root/src/fe-gtk/chanview-tree.c

/* HexChat
 * Copyright (C) 1998-2010 Peter Zelezny.
 * Copyright (C) 2009-2013 Berke Viktor.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
 */

/* file included in chanview.c */

typedef struct
{
	GtkTreeView *tree;
	GtkWidget *scrollw;	/* scrolledWindow */
} treeview;

#include <gdk/gdk.h>

static void 	/* row-activated, when a row is double clicked */
cv_tree_activated_cb (GtkTreeView *view, GtkTreePath *path,
							 GtkTreeViewColumn *column, gpointer data)
{
	if (gtk_tree_view_row_expanded (view, path))
		gtk_tree_view_collapse_row (view, path);
	else
		gtk_tree_view_expand_row (view, path, FALSE);
}

static void		/* row selected callback */
cv_tree_sel_cb (GtkTreeSelection *sel, chanview *cv)
{
	GtkTreeModel *model;
	GtkTreeIter iter;
	chan *ch;

	if (gtk_tree_selection_get_selected (sel, &model, &iter))
	{
		gtk_tree_model_get (model, &iter, COL_CHAN, &ch, -1);

		cv->focused = ch;
		cv->cb_focus (cv, ch, ch->tag, ch->userdata);
	}
}

static gboolean
cv_tree_click_cb (GtkTreeView *tree, GdkEventButton *event, chanview *cv)
{
	chan *ch;
	GtkTreePath *path;
	GtkTreeIter iter;
	int ret = FALSE;

	if (gtk_tree_view_get_path_at_pos (tree, event->x, event->y, &path, 0, 0, 0))
	{
		if (gtk_tree_model_get_iter (GTK_TREE_MODEL (cv->store), &iter, path))
		{
			gtk_tree_model_get (GTK_TREE_MODEL (cv->store), &iter, COL_CHAN, &ch, -1);
			ret = cv->cb_contextmenu (cv, ch, ch->tag, ch->userdata, event);
		}
		gtk_tree_path_free (path);
	}
	return ret;
}

static void
cv_tree_scroll_event_cb (GtkWidget *widget, GdkEventScroll *event)
{
	if (prefs.hex_gui_tab_scrollchans)
	{
		if (event->direction == GDK_SCROLL_DOWN)
			mg_switch_page (1, 1);
		else if (event->direction == GDK_SCROLL_UP)
			mg_switch_page (1, -1);
	}
}

static void
cv_tree_init (chanview *cv)
{
	GtkWidget *view, *win;
	GtkCellRenderer *renderer;
	GtkTreeViewColumn *col;
	int wid1, wid2;
	static const GtkTargetEntry dnd_src_target[] =
	{
		{"HEXCHAT_CHANVIEW", GTK_TARGET_SAME_APP, 75 }
	};
	static const GtkTargetEntry dnd_dest_target[] =
	{
		{"HEXCHAT_USERLIST", GTK_TARGET_SAME_APP, 75 }
	};

	win = gtk_scrolled_window_new (0, 0);
	/*gtk_container_set_border_width (GTK_CONTAINER (win), 1);*/
	gtk_scrolled_window_set_shadow_type (GTK_SCROLLED_WINDOW (win),
													 GTK_SHADOW_IN);
	gtk_scrolled_window_set_policy (GTK_SCROLLED_WINDOW (win),
											  GTK_POLICY_NEVER, GTK_POLICY_AUTOMATIC);
	gtk_container_add (GTK_CONTAINER (cv->box), win);
	gtk_widget_show (win);

	view = gtk_tree_view_new_with_model (GTK_TREE_MODEL (cv->store));
	gtk_widget_set_name (view, "hexchat-tree");
	if (cv->style)
		gtk_widget_set_style (view, cv->style);
	/*gtk_widget_modify_base (view, GTK_STATE_NORMAL, &colors[COL_BG]);*/
	gtk_widget_set_can_focus (view, FALSE);
	gtk_tree_view_set_headers_visible (GTK_TREE_VIEW (view), FALSE);

	if (prefs.hex_gui_tab_dots)
	{
		gtk_tree_view_set_enable_tree_lines (GTK_TREE_VIEW (view), TRUE);
	}
	
	/* Indented channels with no server looks silly, but we still want expanders */
	if (!prefs.hex_gui_tab_server)
	{
		gtk_widget_style_get (view, "expander-size", &wid1, "horizontal-separator", &wid2, NULL);
		gtk_tree_view_set_level_indentation (GTK_TREE_VIEW (view), -wid1 - wid2);
	}


	gtk_container_add (GTK_CONTAINER (win), view);
	col = gtk_tree_view_column_new();

	/* icon column */
	if (cv->use_icons)
	{
		renderer = gtk_cell_renderer_pixbuf_new ();
		if (prefs.hex_gui_compact)
			g_object_set (G_OBJECT (renderer), "ypad", 0, NULL);

		gtk_tree_view_column_pack_start(col, renderer, FALSE);
		gtk_tree_view_column_set_attributes (col, renderer, "pixbuf", COL_PIXBUF, NULL);
	}

	/* main column */
	renderer = gtk_cell_renderer_text_new ();
	if (prefs.hex_gui_compact)
		g_object_set (G_OBJECT (renderer), "ypad", 0, NULL);
	gtk_cell_renderer_text_set_fixed_height_from_font (GTK_CELL_RENDERER_TEXT (renderer), 1);
	gtk_tree_view_column_pack_start(col, renderer, TRUE);
	gtk_tree_view_column_set_attributes (col, renderer, "text", COL_NAME, "attributes", COL_ATTR, NULL);
	gtk_tree_view_append_column(GTK_TREE_VIEW(view), col);									

	g_signal_connect (G_OBJECT (gtk_tree_view_get_selection (GTK_TREE_VIEW (view))),
							"changed", G_CALLBACK (cv_tree_sel_cb), cv);
	g_signal_connect (G_OBJECT (view), "button-press-event",
							G_CALLBACK (cv_tree_click_cb), cv);
	g_signal_connect (G_OBJECT (view), "row-activated",
							G_CALLBACK (cv_tree_activated_cb), NULL);
	g_signal_connect (G_OBJECT (view), "scroll_event",
							G_CALLBACK (cv_tree_scroll_event_cb), NULL);

	gtk_drag_dest_set (view, GTK_DEST_DEFAULT_ALL, dnd_dest_target, 1,
							 GDK_ACTION_MOVE | GDK_ACTION_COPY | GDK_ACTION_LINK);
	gtk_drag_source_set (view, GDK_BUTTON1_MASK, dnd_src_target, 1, GDK_ACTION_COPY);

#ifndef WIN32
	g_signal_connect (G_OBJECT (view), "drag_begin",
							G_CALLBACK (mg_drag_begin_cb), NULL);
	g_signal_connect (G_OBJECT (view), "drag_drop",
							G_CALLBACK (mg_drag_drop_cb), NULL);
	g_signal_connect (G_OBJECT (view), "drag_motion",
							G_CALLBACK (mg_drag_motion_cb), NULL);
	g_signal_connect (G_OBJECT (view), "drag_end",
							G_CALLBACK (mg_drag_end_cb), NULL);
#endif

	((treeview *)cv)->tree = GTK_TREE_VIEW (view);
	((treeview *)cv)->scrollw = win;
	gtk_widget_show (view);
}

static void
cv_tree_postinit (chanview *cv)
{
	gtk_tree_view_expand_all (((treeview *)cv)->tree);
}

static void *
cv_tree_add (chanview *cv, chan *ch, char *name, GtkTreeIter *parent)
{
	GtkTreePath *path;

	if (parent)
	{
		/* expand the parent node */
		path = gtk_tree_model_get_path (GTK_TREE_MODEL (cv->store), parent);
		if (path)
		{
			gtk_tree_view_expand_row (((treeview *)cv)->tree, path, FALSE);
			gtk_tree_path_free (path);
		}
	}

	return NULL;
}

static void
cv_tree_change_orientation (chanview *cv)
{
}

static void
cv_tree_focus (chan *ch)
{
	GtkTreeView *tree = ((treeview *)ch->cv)->tree;
	GtkTreeModel *model = gtk_tree_view_get_model (tree);
	GtkTreePath *path;
	GtkTreeIter parent;
	GdkRectangle cell_rect;
	GdkRectangle vis_rect;
	gint dest_y;

	/* expand the parent node */
	if (gtk_tree_model_iter_parent (model, &parent, &ch->iter))
	{
		path = gtk_tree_model_get_path (model, &parent);
		if (path)
		{
			/*if (!gtk_tree_view_row_expanded (tree, path))
			{
				gtk_tree_path_free (path);
				return;
			}*/
			gtk_tree_view_expand_row (tree, path, FALSE);
			gtk_tree_path_free (path);
		}
	}

	path = gtk_tree_model_get_path (model, &ch->iter);
	if (path)
	{
		/* This full section does what
		 * gtk_tree_view_scroll_to_cell (tree, path, NULL, TRUE, 0.5, 0.5);
		 * does, except it only scrolls the window if the provided cell is
		 * not visible. Basic algorithm taken from gtktreeview.c */

		/* obtain information to see if the cell is visible */
		gtk_tree_view_get_background_area (tree, path, NULL, &cell_rect);
		gtk_tree_view_get_visible_rect (tree, &vis_rect);

		/* The cordinates aren't offset correctly */
		gtk_tree_view_convert_widget_to_bin_window_coords ( tree, cell_rect.x, cell_rect.y, NULL, &cell_rect.y );

		/* only need to scroll if out of bounds */
		if (cell_rect.y < vis_rect.y ||
				cell_rect.y + cell_rect.height > vis_rect.y + vis_rect.height)
		{
			dest_y = cell_rect.y - ((vis_rect.height - cell_rect.height) * 0.5);
			if (dest_y < 0)
				dest_y = 0;
			gtk_tree_view_scroll_to_point (tree, -1, dest_y);
		}
		/* theft done, now make it focused like */
		gtk_tree_view_set_cursor (tree, path, NULL, FALSE);
		gtk_tree_path_free (path);
	}
}

static void
cv_tree_move_focus (chanview *cv, gboolean relative, int num)
{
	chan *ch;

	if (relative)
	{
		num += cv_find_number_of_chan (cv, cv->focused);
		num %= cv->size;
		/* make it wrap around at both ends */
		if (num < 0)
			num = cv->size - 1;
	}

	ch = cv_find_chan_by_number (cv, num);
	if (ch)
		cv_tree_focus (ch);
}

static void
cv_tree_remove (chan *ch)
{
}

static void
move_row (chan *ch, int delta, GtkTreeIter *parent)
{
	GtkTreeStore *store = ch->cv->store;
	GtkTreeIter *src = &ch->iter;
	GtkTreeIter dest = ch->iter;
	GtkTreePath *dest_path;

	if (delta < 0) /* down */
	{
		if (gtk_tree_model_iter_next (GTK_TREE_MODEL (store), &dest))
			gtk_tree_store_swap (store, src, &dest);
		else	/* move to top */
			gtk_tree_store_move_after (store, src, NULL);

	} else
	{
		dest_path = gtk_tree_model_get_path (GTK_TREE_MODEL (store), &dest);
		if (gtk_tree_path_prev (dest_path))
		{
			gtk_tree_model_get_iter (GTK_TREE_MODEL (store), &dest, dest_path);
			gtk_tree_store_swap (store, src, &dest);
		} else
		{	/* move to bottom */
			gtk_tree_store_move_before (store, src, NULL);
		}

		gtk_tree_path_free (dest_path);
	}
}

static void
cv_tree_move (chan *ch, int delta)
{
	GtkTreeIter parent;

	/* do nothing if this is a server row */
	if (gtk_tree_model_iter_parent (GTK_TREE_MODEL (ch->cv->store), &parent, &ch->iter))
		move_row (ch, delta, &parent);
}

static void
cv_tree_move_family (chan *ch, int delta)
{
	move_row (ch, delta, NULL);
}

static void
cv_tree_cleanup (chanview *cv)
{
	if (cv->box)
		/* kill the scrolled window */
		gtk_widget_destroy (((treeview *)cv)->scrollw);
}

static void
cv_tree_set_color (chan *ch, PangoAttrList *list)
{
	/* nothing to do, it's already set in the store */
}

static void
cv_tree_rename (chan *ch, char *name)
{
	/* nothing to do, it's already renamed in the store */
}

static chan *
cv_tree_get_parent (chan *ch)
{
	chan *parent_ch = NULL;
	GtkTreeIter parent;

	if (gtk_tree_model_iter_parent (GTK_TREE_MODEL (ch->cv->store), &parent, &ch->iter))
	{
		gtk_tree_model_get (GTK_TREE_MODEL (ch->cv->store), &parent, COL_CHAN, &parent_ch, -1);
	}

	return parent_ch;
}

static gboolean
cv_tree_is_collapsed (chan *ch)
{
	chan *parent = cv_tree_get_parent (ch);
	GtkTreePath *path = NULL;
	gboolean ret;

	if (parent == NULL)
		return FALSE;

	path = gtk_tree_model_get_path (GTK_TREE_MODEL (parent->cv->store),
											  &parent->iter);
	ret = !gtk_tree_view_row_expanded (((treeview *)parent->cv)->tree, path);
	gtk_tree_path_free (path);
	
	return ret;
}

class="p">), viewport, 1, 1, 0);
	gtk_widget_show (viewport);

	if (cv->vertical)
		box = gtk_vbox_new (FALSE, 0);
	else
		box = gtk_hbox_new (FALSE, 0);
	((tabview *)cv)->inner = box;
	gtk_container_add (GTK_CONTAINER (viewport), box);
	gtk_widget_show (box);

	/* if vertical, the buttons can be side by side */
	if (cv->vertical)
	{
		hbox = gtk_hbox_new (FALSE, 0);
		gtk_box_pack_start (GTK_BOX (outer), hbox, 0, 0, 0);
		gtk_widget_show (hbox);
	}

	/* make the Scroll buttons */
	((tabview *)cv)->b2 = make_sbutton (cv->vertical ?
													GTK_ARROW_UP : GTK_ARROW_LEFT,
													tab_scroll_left_up_clicked,
													cv);

	((tabview *)cv)->b1 = make_sbutton (cv->vertical ?
													GTK_ARROW_DOWN : GTK_ARROW_RIGHT,
													tab_scroll_right_down_clicked,
													cv);

	if (hbox)
	{
		gtk_container_add (GTK_CONTAINER (hbox), ((tabview *)cv)->b2);
		gtk_container_add (GTK_CONTAINER (hbox), ((tabview *)cv)->b1);
	} else
	{
		gtk_box_pack_start (GTK_BOX (outer), ((tabview *)cv)->b2, 0, 0, 0);
		gtk_box_pack_start (GTK_BOX (outer), ((tabview *)cv)->b1, 0, 0, 0);
	}

	button = gtkutil_button (outer, GTK_STOCK_CLOSE, NULL, cv_tabs_xclick_cb,
									 cv, 0);
	gtk_button_set_relief (GTK_BUTTON (button), GTK_RELIEF_NONE);
	gtk_widget_set_can_focus (button, FALSE);

	gtk_container_add (GTK_CONTAINER (cv->box), outer);
}

static void
cv_tabs_postinit (chanview *cv)
{
}

static void
tab_add_sorted (chanview *cv, GtkWidget *box, GtkWidget *tab, chan *ch)
{
	GList *list;
	GtkWidget *child;
	int i = 0;
	void *b;

	if (!cv->sorted)
	{
		gtk_box_pack_start (GTK_BOX (box), tab, 0, 0, 0);
		gtk_widget_show (tab);
		return;
	}

	/* sorting TODO:
    *   - move tab if renamed (dialogs) */

	/* userdata, passed to mg_tabs_compare() */
	b = ch->userdata;

	list = gtk_container_get_children (GTK_CONTAINER (box));
	while (list)
	{
		child = list->data;
		if (!GTK_IS_SEPARATOR (child))
		{
			void *a = g_object_get_data (G_OBJECT (child), "u");

			if (ch->tag == 0 && cv->cb_compare (a, b) > 0)
			{
				gtk_box_pack_start (GTK_BOX (box), tab, 0, 0, 0);
				gtk_box_reorder_child (GTK_BOX (box), tab, i);
				gtk_widget_show (tab);
				return;
			}
		}
		i++;
		list = list->next;
	}

	/* append */
	gtk_box_pack_start (GTK_BOX (box), tab, 0, 0, 0);
	gtk_box_reorder_child (GTK_BOX (box), tab, i);
	gtk_widget_show (tab);
}

/* remove empty boxes and separators */

static void
cv_tabs_prune (chanview *cv)
{
	GList *boxes, *children;
	GtkWidget *box, *inner;
	GtkWidget *child;
	int empty;

	inner = ((tabview *)cv)->inner;
	boxes = gtk_container_get_children (GTK_CONTAINER (inner));
	while (boxes)
	{
		child = boxes->data;
		box = child;
		boxes = boxes->next;

		/* check if the box is empty (except a vseperator) */
		empty = TRUE;
		children = gtk_container_get_children (GTK_CONTAINER (box));
		while (children)
		{
			if (!GTK_IS_SEPARATOR ((GtkWidget *)children->data))
			{
				empty = FALSE;
				break;
			}
			children = children->next;
		}

		if (empty)
			gtk_widget_destroy (box);
	}
}

static void
tab_add_real (chanview *cv, GtkWidget *tab, chan *ch)
{
	GList *boxes, *children;
	GtkWidget *sep, *box, *inner;
	GtkWidget *child;
	int empty;

	inner = ((tabview *)cv)->inner;
	/* see if a family for this tab already exists */
	boxes = gtk_container_get_children (GTK_CONTAINER (inner));
	while (boxes)
	{
		child = boxes->data;
		box = child;

		if (g_object_get_data (G_OBJECT (box), "f") == ch->family)
		{
			tab_add_sorted (cv, box, tab, ch);
			gtk_widget_queue_resize (gtk_widget_get_parent(inner));
			return;
		}

		boxes = boxes->next;

		/* check if the box is empty (except a vseperator) */
		empty = TRUE;
		children = gtk_container_get_children (GTK_CONTAINER (box));
		while (children)
		{
			if (!GTK_IS_SEPARATOR ((GtkWidget *)children->data))
			{
				empty = FALSE;
				break;
			}
			children = children->next;
		}

		if (empty)
			gtk_widget_destroy (box);
	}

	/* create a new family box */
	if (cv->vertical)
	{
		/* vertical */
		box = gtk_vbox_new (FALSE, 0);
		sep = gtk_hseparator_new ();
	} else
	{
		/* horiz */
		box = gtk_hbox_new (FALSE, 0);
		sep = gtk_vseparator_new ();
	}

	gtk_box_pack_end (GTK_BOX (box), sep, 0, 0, 4);
	gtk_widget_show (sep);
	gtk_box_pack_start (GTK_BOX (inner), box, 0, 0, 0);
	g_object_set_data (G_OBJECT (box), "f", ch->family);
	gtk_box_pack_start (GTK_BOX (box), tab, 0, 0, 0);
	gtk_widget_show (tab);
	gtk_widget_show (box);
	gtk_widget_queue_resize (gtk_widget_get_parent(inner));
}

static gboolean
tab_ignore_cb (GtkWidget *widget, GdkEventCrossing *event, gpointer user_data)
{
	return TRUE;
}

/* called when a tab is clicked (button down) */

static void
tab_pressed_cb (GtkToggleButton *tab, chan *ch)
{
	chan *old_tab;
	int is_switching = TRUE;
	chanview *cv = ch->cv;

	ignore_toggle = TRUE;
	/* de-activate the old tab */
	old_tab = cv->focused;
	if (old_tab && old_tab->impl)
	{
		gtk_toggle_button_set_active (GTK_TOGGLE_BUTTON (old_tab->impl), FALSE);
		if (old_tab == ch)
			is_switching = FALSE;
	}
	gtk_toggle_button_set_active (tab, TRUE);
	ignore_toggle = FALSE;
	cv->focused = ch;

	if (/*tab->active*/is_switching)
		/* call the focus callback */
		cv->cb_focus (cv, ch, ch->tag, ch->userdata);
}

/* called for keyboard tab toggles only */
static void
tab_toggled_cb (GtkToggleButton *tab, chan *ch)
{
	if (ignore_toggle)
		return;

	/* activated a tab via keyboard */
	tab_pressed_cb (tab, ch);
}

static gboolean
tab_click_cb (GtkWidget *wid, GdkEventButton *event, chan *ch)
{
	return ch->cv->cb_contextmenu (ch->cv, ch, ch->tag, ch->userdata, event);
}

static void *
cv_tabs_add (chanview *cv, chan *ch, char *name, GtkTreeIter *parent)
{
	GtkWidget *but;

	but = gtk_toggle_button_new_with_label (name);
	gtk_widget_set_name (but, "hexchat-tab");
	g_object_set_data (G_OBJECT (but), "c", ch);
	/* used to trap right-clicks */
	g_signal_connect (G_OBJECT (but), "button_press_event",
						 	G_CALLBACK (tab_click_cb), ch);
	/* avoid prelights */
	g_signal_connect (G_OBJECT (but), "enter_notify_event",
						 	G_CALLBACK (tab_ignore_cb), NULL);
	g_signal_connect (G_OBJECT (but), "leave_notify_event",
						 	G_CALLBACK (tab_ignore_cb), NULL);
	g_signal_connect (G_OBJECT (but), "pressed",
							G_CALLBACK (tab_pressed_cb), ch);
	/* for keyboard */
	g_signal_connect (G_OBJECT (but), "toggled",
						 	G_CALLBACK (tab_toggled_cb), ch);
	g_object_set_data (G_OBJECT (but), "u", ch->userdata);

	tab_add_real (cv, but, ch);

	return but;
}

/* traverse all the family boxes of tabs 
 *
 * A "group" is basically:
 * GtkV/HBox
 * `-GtkViewPort
 *   `-GtkV/HBox (inner box)
 *     `- GtkBox (family box)
 *        `- GtkToggleButton
 *        `- GtkToggleButton
 *        `- ...
 *     `- GtkBox
 *        `- GtkToggleButton
 *        `- GtkToggleButton
 *        `- ...
 *     `- ...
 *
 * */

static int
tab_group_for_each_tab (chanview *cv,
								int (*callback) (GtkWidget *tab, int num, int usernum),
								int usernum)
{
	GList *tabs;
	GList *boxes;
	GtkWidget *child;
	GtkBox *innerbox;
	int i;

	innerbox = (GtkBox *) ((tabview *)cv)->inner;
	boxes = gtk_container_get_children (GTK_CONTAINER (innerbox));
	i = 0;
	while (boxes)
	{
		child = boxes->data;
		tabs = gtk_container_get_children (GTK_CONTAINER (child));

		while (tabs)
		{
			child = tabs->data;

			if (!GTK_IS_SEPARATOR (child))
			{
				if (callback (child, i, usernum) != -1)
					return i;
				i++;
			}
			tabs = tabs->next;
		}

		boxes = boxes->next;
	}

	return i;
}

static int
tab_check_focus_cb (GtkWidget *tab, int num, int unused)
{
	if (gtk_toggle_button_get_active (GTK_TOGGLE_BUTTON (tab)))
		return num;

	return -1;
}

/* returns the currently focused tab number */

static int
tab_group_get_cur_page (chanview *cv)
{
	return tab_group_for_each_tab (cv, tab_check_focus_cb, 0);
}

static void
cv_tabs_focus (chan *ch)
{
	if (ch->impl)
	/* focus the new one (tab_pressed_cb defocuses the old one) */
		tab_pressed_cb (GTK_TOGGLE_BUTTON (ch->impl), ch);
}

static int
tab_focus_num_cb (GtkWidget *tab, int num, int want)
{
	if (num == want)
	{
		cv_tabs_focus (g_object_get_data (G_OBJECT (tab), "c"));
		return 1;
	}

	return -1;
}

static void
cv_tabs_change_orientation (chanview *cv)
{
	/* cleanup the old one */
	if (cv->func_cleanup)
		cv->func_cleanup (cv);

	/* now rebuild a new tabbar or tree */
	cv->func_init (cv);
	chanview_populate (cv);
}

/* switch to the tab number specified */

static void
cv_tabs_move_focus (chanview *cv, gboolean relative, int num)
{
	int i, max;

	if (relative)
	{
		max = cv->size;
		i = tab_group_get_cur_page (cv) + num;
		/* make it wrap around at both ends */
		if (i < 0)
			i = max - 1;
		if (i >= max)
			i = 0;
		tab_group_for_each_tab (cv, tab_focus_num_cb, i);
		return;
	}

	tab_group_for_each_tab (cv, tab_focus_num_cb, num);
}

static void
cv_tabs_remove (chan *ch)
{
	gtk_widget_destroy (ch->impl);
	ch->impl = NULL;

	cv_tabs_prune (ch->cv);
}

static void
cv_tabs_move (chan *ch, int delta)
{
	int i = 0;
	int pos = 0;
	GList *list;
	GtkWidget *parent = gtk_widget_get_parent(GTK_WIDGET (ch->impl));

	for (list = gtk_container_get_children (GTK_CONTAINER (parent)); list; list = list->next)
	{
		GtkWidget *child_entry;

		child_entry = list->data;
		if (child_entry == ch->impl)
			pos = i;

		/* keep separator at end to not throw off our count */
		if (GTK_IS_SEPARATOR (child_entry))
			gtk_box_reorder_child (GTK_BOX (parent), child_entry, -1);
		else
			i++;
	}

	pos = (pos - delta) % i;
	gtk_box_reorder_child (GTK_BOX (parent), ch->impl, pos);
}

static void
cv_tabs_move_family (chan *ch, int delta)
{
	int i, pos = 0;
	GList *list;
	GtkWidget *box = NULL;

	/* find position of tab's family */
	i = 0;
	for (list = gtk_container_get_children (GTK_CONTAINER (((tabview *)ch->cv)->inner)); list; list = list->next)
	{
		GtkWidget *child_entry;
		void *fam;

		child_entry = list->data;
		fam = g_object_get_data (G_OBJECT (child_entry), "f");
		if (fam == ch->family)
		{
			box = child_entry;
			pos = i;
		}
		i++;
	}

	pos = (pos - delta) % i;
	gtk_box_reorder_child (GTK_BOX (gtk_widget_get_parent(box)), box, pos);
}

static void
cv_tabs_cleanup (chanview *cv)
{
	if (cv->box)
		gtk_widget_destroy (((tabview *)cv)->outer);
}

static void
cv_tabs_set_color (chan *ch, PangoAttrList *list)
{
	gtk_label_set_attributes (GTK_LABEL (gtk_bin_get_child (GTK_BIN (ch->impl))), list);
}

static void
cv_tabs_rename (chan *ch, char *name)
{
	PangoAttrList *attr;
	GtkWidget *tab = ch->impl;

	attr = gtk_label_get_attributes (GTK_LABEL (gtk_bin_get_child (GTK_BIN (tab))));
	if (attr)
		pango_attr_list_ref (attr);

	gtk_button_set_label (GTK_BUTTON (tab), name);
	gtk_widget_queue_resize (gtk_widget_get_parent(gtk_widget_get_parent(gtk_widget_get_parent(tab))));

	if (attr)
	{
		gtk_label_set_attributes (GTK_LABEL (gtk_bin_get_child (GTK_BIN (tab))), attr);
		pango_attr_list_unref (attr);
	}
}

static gboolean
cv_tabs_is_collapsed (chan *ch)
{
	return FALSE;
}

static chan *
cv_tabs_get_parent (chan *ch)
{
	return NULL;
}