com.touchgraph.graphlayout.interaction
Class HVScroll

java.lang.Object
  com.touchgraph.graphlayout.interaction.HVScroll

All Implemented Interfaces:

GraphListener, EventListener

public class HVScroll
extends Object
implements GraphListener

HVScroll: Allows for scrolling horizontally+vertically. This can be done in all sorts of ways, for instance by using the scrollbars, or by dragging.

This code is more complex then it would seem it should be, because scrolling has to be independent of the screen being warped by lenses. HVScroll needs to use the tgLensSet object because the offset is recorded in real coordinates, while the user interacts with the drawn coordinates.

Version:

1.21 $Id: HVScroll.java,v 3.1 2004/11/22 01:30:47 altheim Exp $

Author:

Alexander Shapiro, Murray Altheim (2002-09-17 thread groups, 2002-12-12 v1.22 features)

Field Summary

boolean

scrolling

Constructor Summary

HVScroll(TGPanel tgp, TGLensSet tgls)
Constructor with a TGPanel tgp and TGLensSet tgls.

Method Summary

void	cancelScrolling() Immediately halts the center-scrolling thread loop.
Point2D.Double	getBottomRightDraw()
Point2D.Double	getDrawCenter()
JScrollBar	getHorizontalSB()
com.touchgraph.graphlayout.interaction.HVScroll.HVDragUI	getHVDragUI()
TGAbstractClickUI	getHVScrollToCenterUI()
com.touchgraph.graphlayout.interaction.HVScroll.HVLens	getLens()
Point	getOffset()
int	getOffsetX()
int	getOffsetY()
Point2D.Double	getTopLeftDraw()
JScrollBar	getVerticalSB()
void	graphMoved() Updates the graph following a move.
void	graphReset()
boolean	isScrolling() Returns true if the center-scrolling thread is active.
void	scrollAtoB(Point2D.Double drawFrom, Point2D.Double drawTo)
void	setOffset(Point p)
void	slowScrollToCenter(Node n)

Methods inherited from class java.lang.Object

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

Field Detail

scrolling

public boolean scrolling

Constructor Detail

HVScroll

public HVScroll(TGPanel tgp,
                TGLensSet tgls)

Constructor with a TGPanel tgp and TGLensSet tgls.

Method Detail

getHorizontalSB

public JScrollBar getHorizontalSB()

getVerticalSB

public JScrollBar getVerticalSB()

getHVDragUI

public com.touchgraph.graphlayout.interaction.HVScroll.HVDragUI getHVDragUI()

getLens

public com.touchgraph.graphlayout.interaction.HVScroll.HVLens getLens()

getHVScrollToCenterUI

public TGAbstractClickUI getHVScrollToCenterUI()

getTopLeftDraw

public Point2D.Double getTopLeftDraw()

getBottomRightDraw

public Point2D.Double getBottomRightDraw()

getDrawCenter

public Point2D.Double getDrawCenter()

graphMoved

public void graphMoved()

Updates the graph following a move. From the GraphListener interface.

Specified by:

graphMoved in interface GraphListener

graphReset

public void graphReset()

Specified by:

graphReset in interface GraphListener

setOffset

public void setOffset(Point p)

getOffset

public Point getOffset()

getOffsetX

public int getOffsetX()

getOffsetY

public int getOffsetY()

scrollAtoB

public void scrollAtoB(Point2D.Double drawFrom,
                       Point2D.Double drawTo)

isScrolling

public boolean isScrolling()

Returns true if the center-scrolling thread is active.

cancelScrolling

public void cancelScrolling()

Immediately halts the center-scrolling thread loop.

slowScrollToCenter

public void slowScrollToCenter(Node n)