at.ofai.music.beatroot
Class ZoomListener

java.lang.Object
  at.ofai.music.beatroot.ZoomListener

All Implemented Interfaces:

java.awt.event.ActionListener, java.util.EventListener

 class ZoomListener
extends java.lang.Object
implements java.awt.event.ActionListener

A listener class for notifying the GUI's main panel about changes in the zoom level.

Field Summary

(package private) BeatTrackDisplay	displayPanel The main data panel of BeatRoot's GUI
(package private) javax.swing.JScrollBar	scroller The scrollbar for selecting what part of the audio data is displayed
(package private) javax.swing.JTextField	valueField An editable text field containing the length (in seconds) of visible audio data

Constructor Summary

ZoomListener(BeatTrackDisplay btd, javax.swing.JScrollBar sb, javax.swing.JTextField vf)
Constructor:

Method Summary

void	actionPerformed(java.awt.event.ActionEvent e) Called when a zoom button is pressed or the text field is edited.
static double	delta(double value, double sign) Increments or decrements and rounds the length of visible audio data.

Methods inherited from class java.lang.Object

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

Field Detail

scroller

javax.swing.JScrollBar scroller

The scrollbar for selecting what part of the audio data is displayed

displayPanel

BeatTrackDisplay displayPanel

The main data panel of BeatRoot's GUI

valueField

javax.swing.JTextField valueField

An editable text field containing the length (in seconds) of visible audio data

Constructor Detail

ZoomListener

public ZoomListener(BeatTrackDisplay btd,
                    javax.swing.JScrollBar sb,
                    javax.swing.JTextField vf)

Constructor:

Parameters:

btd - The main data panel of BeatRoot's GUI

sb - The scrollbar for selecting what part of the audio data is displayed

vf - The text field containing the length (in seconds) of visible audio data

Method Detail

delta

public static double delta(double value,
                           double sign)

Increments or decrements and rounds the length of visible audio data.

Parameters:

value - The original length of visible audio data

sign - The direction of change (+1.0 or -1.0)

Returns:

The new length of visible audio data

actionPerformed

public void actionPerformed(java.awt.event.ActionEvent e)

Called when a zoom button is pressed or the text field is edited. Implements the ActionListener interface.

Specified by:

actionPerformed in interface java.awt.event.ActionListener

Parameters:

e - The object indicating what kind of event occurred