com.declarativa.interprolog.gui

Class SmartScroller

java.lang.Object

com.declarativa.interprolog.gui.SmartScroller

All Implemented Interfaces:

AdjustmentListener, EventListener

public class SmartScroller
extends Object
implements AdjustmentListener

Grabbed from Rob Camick's post at https://tips4java.wordpress.com/2013/03/03/smart-scrolling/ The SmartScroller will attempt to keep the viewport positioned based on the users interaction with the scrollbar. The normal behaviour is to keep the viewport positioned to see new data as it is dynamically added. Assuming vertical scrolling and data is added to the bottom: - when the viewport is at the bottom and new data is added, then automatically scroll the viewport to the bottom - when the viewport is not at the bottom and new data is added, then do nothing with the viewport Assuming vertical scrolling and data is added to the top: - when the viewport is at the top and new data is added, then do nothing with the viewport - when the viewport is not at the top and new data is added, then adjust the viewport to the relative position it was at before the data was added Similiar logic would apply for horizontal scrolling.

Field Summary

Fields

Modifier and Type	Field and Description
static int	END
static int	HORIZONTAL
static int	START
static int	VERTICAL

Constructor Summary

Constructors

Constructor and Description
SmartScroller(JScrollPane scrollPane) Convenience constructor.
SmartScroller(JScrollPane scrollPane, int viewportPosition) Convenience constructor.
SmartScroller(JScrollPane scrollPane, int scrollDirection, int viewportPosition) Specify how the SmartScroller will function.

Method Summary

Modifier and Type	Method and Description
void	adjustmentValueChanged(AdjustmentEvent e)

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

HORIZONTAL

public static final int HORIZONTAL

See Also:

Constant Field Values

VERTICAL

public static final int VERTICAL

See Also:

Constant Field Values

START

public static final int START

See Also:

Constant Field Values

END

public static final int END

See Also:

Constant Field Values

Constructor Detail

SmartScroller

public SmartScroller(JScrollPane scrollPane)

Convenience constructor. Scroll direction is VERTICAL and viewport position is at the END.

Parameters:

scrollPane - the scroll pane to monitor

SmartScroller

public SmartScroller(JScrollPane scrollPane,
                     int viewportPosition)

Convenience constructor. Scroll direction is VERTICAL.

Parameters:

scrollPane - the scroll pane to monitor

viewportPosition - valid values are START and END

SmartScroller

public SmartScroller(JScrollPane scrollPane,
                     int scrollDirection,
                     int viewportPosition)

Specify how the SmartScroller will function.

Parameters:

scrollPane - the scroll pane to monitor

scrollDirection - indicates which JScrollBar to monitor. Valid values are HORIZONTAL and VERTICAL.

viewportPosition - indicates where the viewport will normally be positioned as data is added. Valid values are START and END

Method Detail

adjustmentValueChanged

public void adjustmentValueChanged(AdjustmentEvent e)

Specified by:

adjustmentValueChanged in interface AdjustmentListener