The GroupView is a editable object view on workspace. This widget should display the special editable object for Group. Widget should:

• calculate the padding for part that stands out
• select part by click
• emit signals for events, 'mouse,in', 'mouse,out' for each part
• send message about where cursor now, means that widget send message with part name over which cursor now
• calculate part geometry and paddings for it related to editable object geometry
• calculate object area geometry and paddings related to editable object goemetry