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/*
Wotonomy: OpenStep design patterns for pure Java applications.
Copyright (C) 2000 Blacksmith, Inc.
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, see http://www.gnu.org
*/
package net.wotonomy.ui.swing.components;
import java.awt.Component;
import javax.swing.AbstractButton;
import javax.swing.ButtonGroup;
import javax.swing.JRadioButton;
import javax.swing.border.EmptyBorder;
/**
* RadioButtonPanel is a simple extension of ButtonPanel. Differences are that
* it uses radio buttons and the default alignment is vertical. The radio
* buttons are placed in a ButtonGroup and the panel defaults to having no
* buttons selected.
*
* @author michael@mpowers.net
* @author $Author: cgruber $
* @version $Revision: 904 $ $Date: 2006-02-18 18:19:05 -0500 (Sat, 18 Feb 2006)
* $
*/
public class RadioButtonPanel extends ButtonPanel {
/**
* A ButtonGroup to help manage button state.
*/
protected ButtonGroup buttonGroup;
/**
* ButtonGroup does not make it easy to unselect all buttons. The preferred way
* to do it is actually to create a hidden button.
*/
protected JRadioButton hiddenButton;
/**
* Constructs a RadioButtonPanel. Three buttons are created so the panel is
* filled when used in a GUI-builder environment.
*/
public RadioButtonPanel() {
super();
}
/**
* Constructs a ButtonPanel using specified buttons.
*
* @param buttonList An array containing the strings to be used in labeling the
* buttons.
*/
public RadioButtonPanel(String[] buttonList) {
super(buttonList);
}
/**
* Overridden to set vertical-center alignment and 2-pixel vgap.
*/
protected void initLayout() {
super.initLayout();
buttonPanelLayout.setAlignment(BetterFlowLayout.CENTER_VERTICAL);
buttonPanelLayout.setVgap(2); // looks nicer than java l&f recommendation (imho)
}
/**
* Overridden to return a JRadioButton.
*
* @param aLabel The label for the component that will be created.
* @return The newly created component.
*/
protected Component createComponentWithLabel(String aLabel) {
String buttonLabel = aLabel;
JRadioButton newButton = new JRadioButton();
newButton.setName(aLabel);
newButton.setText(buttonLabel);
newButton.setActionCommand(aLabel);
newButton.addActionListener(this);
// reduce insets per java l&f guidelines (was 4 on each side)
newButton.setBorder(new EmptyBorder(0, 4, 0, 4));
if (buttonGroup == null) {
buttonGroup = new ButtonGroup();
// cheesy hack to allow a buttongroup to have no items selected.
// note that the button is not added to container or buttonList.
hiddenButton = new JRadioButton("Hidden Button");
buttonGroup.add(hiddenButton);
}
buttonGroup.add(newButton);
return newButton;
}
/**
* Selects the button whose name matches the given text value.
*
* @param newText A String matching the name of one of the buttons. If null,
* empty, or not matching, all buttons are deselected.
*/
public void setValue(String aName) {
if (aName != null) {
Component c = null;
int count = buttonContainer.getComponentCount();
for (int i = 0; i < count; i++) {
c = buttonContainer.getComponent(i);
if (c instanceof AbstractButton) {
if (c.getName().equals(aName)) {
((AbstractButton) c).setSelected(true);
return;
}
}
}
}
// null, empty, or not matching - deselect all
hiddenButton.setSelected(true);
}
/**
* Gets the name of the currently selected button.
*
* @return A string matching the name of the currently selected button, or null
* of no button is selected.
*/
public String getValue() {
String result = null;
Component c = null;
int count = buttonContainer.getComponentCount();
for (int i = 0; i < count; i++) {
c = buttonContainer.getComponent(i);
if ((c instanceof AbstractButton) && (((AbstractButton) c).isSelected())) {
return c.getName();
}
}
return result;
}
/**
* Tests whether the specified value is checked.
*
* @param aValue A value to be tested.
* @return True if the specified value is checked, otherwise false.
*/
public boolean getValue(String aValue) {
if (aValue == null)
return false;
return aValue.equals(getValue());
}
}
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