2001-05-24  Jon K Hellan  <hellan@acm.org>

	* src/workbook-control-gui.c (sheet_to_page_index): Rename view to
	scg. Retrieve it from object data on table.
	(sheet_to_page_index):
	(wb_control_gui_focus_cur_sheet, cb_sheet_label_button_press,
	cb_notebook_switch_page): Retrieve scg from object data on table.
	(wbcg_sheet_add): Show and insert in notebook scg->table. scg no
	longer is a GtkTable, it has one.

	* src/sheet-control-gui.c (scg_parent_class): Change to
	GtkObjectClass.
	(cb_table_destroy): New function. Finish all table and canvas
	dependent activities and set scg->table, scg->canvas to NULL.
	(scg_init): Don't create table here.
	(scg_construct): ..but here. Change terminology. Old: outer_table,
	table. New: scg->table, inner_table. Add scg to scg->table as
	object data. Add a destroy callback to scg->table.
	(scg_destroy): Move parts to cb_table_destroy. Unref table if not
	NULL.
	(scg_class_init, GNUMERIC_MAKE_TYPE): Inherit from GtkObject
	instead of GtkTable.
	(scg_cursor_visible): Be prepared for scg->canvas being NULL

	* src/sheet-control-gui.h (struct _SheetControlGUI,
	SheetControlGUIClass): Inherit from GtkObject instead of GtkTable.