Bug 122177 Add input for IntervalBase to Group Editor
BIRT model's group definition has one important property: IntervalBase (see GroupHandle.setIntervalBase). This property controls how interval-based grouping picks the range of its initial group, and is an important part of range-based grouping. BIRT designer's Group Details editor should allow user to edit IntervalBase for a group. This is how the editor should work: * IntervalBase options should be presented only if "Interval" is not "None". (Since IntervalBase only makes sense for interval-based grouping) * IntervalBase should be presented in conjunction with checkbox. When it is unchecked (maps to a NULL IntervalBase value), Data Engine dynamically picks a base value using the first group key value in the result set. When it is checked, the user should input a base value. The following is a suggested look of the UI control: [ ] Use fixed base value for interval: _______________ ( [] is a checkbox, underline ___ is a textbox ).
UI/org.eclipse.birt.report.designer.ui/src/org/eclipse/birt/report/designer/ui/dialogs/GroupDialog.java
else
					{
						inputGroup.clearContents( GroupHandle.FOOTER_SLOT );
					}
				}
			}
			if ( ascending.getSelection( ) )
			{
				inputGroup.setSortDirection( DesignChoiceConstants.SORT_DIRECTION_ASC );
			}
			else
			{
				inputGroup.setSortDirection( DesignChoiceConstants.SORT_DIRECTION_DESC );
			}
		}
		catch ( SemanticException e )
		{
			ExceptionHandler.handle( e );
			return;
		}
		setResult( inputGroup );
		super.okPressed( );
	}
	/**
	 * Returns the internal type index by its value.
	 * 
	 * @param interval
	 */
	private int getIntervalTypeIndex( String interval )
	{