jj2000.disp
Class ImgMouseListener

java.lang.Object
  |
  +--java.awt.event.MouseAdapter
        |
        +--jj2000.disp.ImgMouseListener

All Implemented Interfaces:

java.util.EventListener, java.awt.event.MouseListener, java.awt.event.MouseMotionListener

public class ImgMouseListener

extends java.awt.event.MouseAdapter

implements java.awt.event.MouseMotionListener

This class handles the dragging of an image displayed in an ImgScrollPane. When the mouse is dragged the image scrolls accordingly.

Objects of this class must be registerd as both mouse listener and mouse motion listener.

While the dragging is taking place the cursor is changed to the MOVE_CURSOR type. The original cursor is restored when the mouse is released after the drag.

Field Summary

(package private) ImgScrollPane	isp The component where the image is displayed
(package private) java.awt.Cursor	prevCursor
(package private) int	startMouseX The horizontal coordinate where the drag starts
(package private) int	startMouseY The vertical coordinate where the drag starts
(package private) int	startScrollX The horizontal scroll position when the drag started
(package private) int	startScrollY The vertical scroll position when the drag started

Constructor Summary

ImgMouseListener(ImgScrollPane isp)
Instantiate a new ImgMouseListener that will work on the specified ImgScrollPane.

Method Summary

void	mouseDragged(java.awt.event.MouseEvent evt)
void	mouseMoved(java.awt.event.MouseEvent evt)
void	mousePressed(java.awt.event.MouseEvent e)
void	mouseReleased(java.awt.event.MouseEvent e)

Methods inherited from class java.awt.event.MouseAdapter

mouseClicked, mouseEntered, mouseExited

Methods inherited from class java.lang.Object

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

Field Detail

isp

ImgScrollPane isp

The component where the image is displayed

startMouseX

int startMouseX

The horizontal coordinate where the drag starts

startMouseY

int startMouseY

The vertical coordinate where the drag starts

startScrollX

int startScrollX

The horizontal scroll position when the drag started

startScrollY

int startScrollY

The vertical scroll position when the drag started

prevCursor

java.awt.Cursor prevCursor

Constructor Detail

ImgMouseListener

public ImgMouseListener(ImgScrollPane isp)

Instantiate a new ImgMouseListener that will work on the specified ImgScrollPane.

Parameters:

isp - The image scroll pane on which the actions should operate.

Method Detail

mousePressed

public void mousePressed(java.awt.event.MouseEvent e)

Specified by:

mousePressed in interface java.awt.event.MouseListener

Overrides:

mousePressed in class java.awt.event.MouseAdapter

mouseReleased

public void mouseReleased(java.awt.event.MouseEvent e)

Specified by:

mouseReleased in interface java.awt.event.MouseListener

Overrides:

mouseReleased in class java.awt.event.MouseAdapter

mouseDragged

public void mouseDragged(java.awt.event.MouseEvent evt)

Specified by:

mouseDragged in interface java.awt.event.MouseMotionListener

mouseMoved

public void mouseMoved(java.awt.event.MouseEvent evt)

Specified by:

mouseMoved in interface java.awt.event.MouseMotionListener