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/*
* GammaCorrectionDialog
*
* Copyright (c) 2001, 2002, 2003 Marco Schmidt.
* All rights reserved.
*/
package net.sourceforge.jiu.gui.awt.dialogs;
import java.awt.BorderLayout;
import java.awt.Button;
import java.awt.Dialog;
import java.awt.Frame;
import java.awt.Label;
import java.awt.Panel;
import java.awt.TextField;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;
import net.sourceforge.jiu.apps.Strings;
/**
* A dialog to enter the parameters for a gamma correction operation.
* @author Marco Schmidt
*/
public class GammaCorrectionDialog extends Dialog implements ActionListener, KeyListener
{
private Button ok;
private Button cancel;
private TextField gammaTextField;
private boolean pressedOk;
private Double result;
private final double MAX_GAMMA;
/**
* Creates a GammaCorrectionDialog.
* @param owner the Frame this dialog will belong to
* @param strings Strings resource used for text messages
* @param initialValue the value to be set when the dialog pops up
* @param maxGamma the maximum allowed gamma value
*/
public GammaCorrectionDialog(Frame owner, Strings strings, double initialValue, double maxGamma)
{
super(owner, strings.get(Strings.ADJUST_GAMMA), true);
MAX_GAMMA = maxGamma;
Panel panel = new Panel(new BorderLayout());
panel.add(new Label(strings.get(Strings.ENTER_GAMMA_VALUE)), BorderLayout.CENTER);
gammaTextField = new TextField(Double.toString(initialValue));
gammaTextField.addKeyListener(this);
panel.add(gammaTextField, BorderLayout.EAST);
add(panel, BorderLayout.CENTER);
panel = new Panel();
ok = new Button(strings.get(Strings.OK));
ok.addActionListener(this);
cancel = new Button(strings.get(Strings.CANCEL));
cancel.addActionListener(this);
panel.add(ok);
panel.add(cancel);
add(panel, BorderLayout.SOUTH);
pack();
Dialogs.center(this);
}
/**
* Hides (closes) this dialog if the OK button was source of the action event
* (e.g. if the button was pressed).
*/
public void actionPerformed(ActionEvent e)
{
if (e.getSource() == ok)
{
pressedOk = true;
result = getValue(gammaTextField);
setVisible(false);
}
else
if (e.getSource() == cancel)
{
setVisible(false);
}
}
private Double getValue(TextField tf)
{
if (tf == null)
{
return null;
}
double d;
try
{
d = (Double.valueOf(tf.getText())).doubleValue();
}
catch(NumberFormatException nfe)
{
return null;
}
if (d <= 0.0 || d > MAX_GAMMA)
{
return null;
}
return new Double(d);
}
public Double getValue()
{
return result;
}
public boolean hasPressedOk()
{
return pressedOk;
}
public void handleKeys(KeyEvent e)
{
ok.setEnabled(getValue(gammaTextField) != null);
}
public void keyPressed(KeyEvent e)
{
handleKeys(e);
}
public void keyReleased(KeyEvent e)
{
handleKeys(e);
}
public void keyTyped(KeyEvent e)
{
handleKeys(e);
}
}
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