в 17:44, 31 мая 2010

2010-05-31T17:44:27Z

Admin: 1 версия

2010-05-31T15:32:30Z

1 версия

Новая страница

== Creating JRadioButton Components ==

<OL><LI>A JRadioButton represents a radio button.</LI><LI>You can use multiple JRadioButtons to represents a selection from which only one item can be selected.</LI><LI>To indicate a logical grouping of radio buttons, you use a javax.swing.ButtonGroup object.</LI><LI>To programmatically select a JRadioButton, you pass true to its setSelected method.</LI></OL>



<source lang="java">
public JRadioButton()
JRadioButton aRadioButton = new JRadioButton();
public JRadioButton(Icon icon)
JRadioButton aRadioButton = new JRadioButton(new DiamondIcon(Color.CYAN, false));
aRadioButton.setSelectedIcon(new DiamondIcon(Color.BLUE, true));
public JRadioButton(Icon icon, boolean selected)
JRadioButton aRadioButton = new JRadioButton(new DiamondIcon(Color.CYAN, false), true);
aRadioButton.setSelectedIcon(new DiamondIcon(Color.BLUE, true));
public JRadioButton(String text)
JRadioButton aRadioButton = new JRadioButton("4 slices");
public JRadioButton(String text, boolean selected)
JRadioButton aRadioButton = new JRadioButton("8 slices", true);
public JRadioButton(String text, Icon icon)
JRadioButton aRadioButton = new JRadioButton("12 slices", new DiamondIcon(Color.CYAN, false));
aRadioButton.setSelectedIcon(new DiamondIcon(Color.BLUE, true));
public JRadioButton(String text, Icon icon, boolean selected)
JRadioButton aRadioButton = new JRadioButton("16 slices", new DiamondIcon(Color.CYAN, false), true);
aRadioButton.setSelectedIcon(new DiamondIcon(Color.BLUE, true));
public JRadioButton(Action action)
Action action = ...;
JRadioButton aRadioButton = new JRadioButton(action);</source>



== Customizing JRadioButton Look and Feel ==

Property StringObject TypeRadioButton.backgroundColorRadioButton.borderBorderRadioButton.darkShadowColorRadioButton.disabledTextColorRadioButton.focusColorRadioButton.focusInputMapObject[ ]RadioButton.fontFontRadioButton.foregroundColorRadioButton.gradientListRadioButton.highlightColorRadioButton.iconIconRadioButton.interiorBackgroundColorRadioButton.lightColorRadioButton.marginInsetsRadioButton.rolloverBooleanRadioButton.selectColorRadioButton.shadowColorRadioButton.textIconGapIntegerRadioButton.textShiftOffsetIntegerRadioButtonUIString

== Determining the Selected JRadioButton in a Button Group ==



<source lang="java">
import java.util.Enumeration;
import javax.swing.ButtonGroup;
import javax.swing.JRadioButton;
public class Main {
public static void main(String[] argv) throws Exception {
}
public static JRadioButton getSelection(ButtonGroup group) {
for (Enumeration e = group.getElements(); e.hasMoreElements();) {
JRadioButton b = (JRadioButton) e.nextElement();
if (b.getModel() == group.getSelection()) {
return b;
}
}
return null;
}
}</source>



== Event sequence: Action Event, Item Event and Change Event ==



<source lang="java">
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.ItemEvent;
import java.awt.event.ItemListener;
import javax.swing.AbstractButton;
import javax.swing.ButtonGroup;
import javax.swing.ButtonModel;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JRadioButton;
import javax.swing.event.ChangeEvent;
import javax.swing.event.ChangeListener;
public class JRadioButtonEventSequence {
public static void main(String args[]) {
JFrame frame = new JFrame("Grouping Example");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
JPanel panel = new JPanel(new GridLayout(0, 1));
ButtonGroup group = new ButtonGroup();
JRadioButton aRadioButton = new JRadioButton("A");
JRadioButton bRadioButton = new JRadioButton("B");
ActionListener actionListener = new ActionListener() {
String lastSelected;
public void actionPerformed(ActionEvent actionEvent) {
AbstractButton aButton = (AbstractButton)actionEvent.getSource();
String label = aButton.getText();
String msgStart;
if (label.equals(lastSelected)) {
msgStart = "Reselected: ";
} else {
msgStart = "Selected: ";
}
lastSelected = label;
System.out.println(msgStart + label);
}
};
ItemListener itemListener = new ItemListener() {
String lastSelected;
public void itemStateChanged(ItemEvent itemEvent) {
AbstractButton aButton = (AbstractButton)itemEvent.getSource();
int state = itemEvent.getStateChange();
String label = aButton.getText();
String msgStart;
if (state == ItemEvent.SELECTED) {
if (label.equals(lastSelected)) {
msgStart = "Reselected -> ";
} else {
msgStart = "Selected -> ";
}
lastSelected = label;
} else {
msgStart = "Deselected -> ";
}
System.out.println(msgStart + label);
}
};
ChangeListener changeListener = new ChangeListener() {
public void stateChanged(ChangeEvent changEvent) {
AbstractButton aButton = (AbstractButton)changEvent.getSource();
ButtonModel aModel = aButton.getModel();
boolean armed = aModel.isArmed();
boolean pressed = aModel.isPressed();
boolean selected = aModel.isSelected();
System.out.println("Changed: " + armed + "/" + pressed + "/" +
selected);
}
};
panel.add(aRadioButton);
group.add(aRadioButton);
panel.add(bRadioButton);
group.add(bRadioButton);
aRadioButton.addChangeListener(changeListener);
bRadioButton.addChangeListener(changeListener);
aRadioButton.addActionListener(actionListener);
bRadioButton.addActionListener(actionListener);
aRadioButton.addItemListener(itemListener);
bRadioButton.addItemListener(itemListener);
frame.add(panel);
frame.setSize(300, 200);
frame.setVisible(true);
}

}</source>



== Getting selected JRadioButton in a container ==



<source lang="java">
import java.awt.ruponent;
import java.awt.Container;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.Enumeration;
import java.util.Vector;
import javax.swing.AbstractButton;
import javax.swing.ButtonGroup;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JRadioButton;
public class JRadioButtonSelectedElements {
public static void main(String args[]) {
JFrame frame = new JFrame("Grouping Example");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
JPanel panel = new JPanel(new GridLayout(0, 1));
ButtonGroup group = new ButtonGroup();
JRadioButton aRadioButton = new JRadioButton("A");
JRadioButton bRadioButton = new JRadioButton("B");
ActionListener crustActionListener = new ActionListener() {
String lastSelected;
public void actionPerformed(ActionEvent actionEvent) {
AbstractButton aButton = (AbstractButton) actionEvent.getSource();
String label = aButton.getText();
String msgStart;
if (label.equals(lastSelected)) {
msgStart = "Reselected: ";
} else {
msgStart = "Selected: ";
}
lastSelected = label;
System.out.println(msgStart + label);
}
};
panel.add(aRadioButton);
group.add(aRadioButton);
panel.add(bRadioButton);
group.add(bRadioButton);
aRadioButton.addActionListener(crustActionListener);
bRadioButton.addActionListener(crustActionListener);
frame.add(panel);
frame.setSize(300, 200);
frame.setVisible(true);

System.out.println(getSelectedElements(panel).hasMoreElements());
}
public static Enumeration<String> getSelectedElements(Container container) {
Vector<String> selections = new Vector<String>();
Component components[] = container.getComponents();
for (int i=0, n=components.length; i<n; i++) {
if (components[i] instanceof AbstractButton) {
AbstractButton button = (AbstractButton)components[i];
if (button.isSelected()) {
selections.addElement(button.getText());
}
}
}
return selections.elements();
}
}</source>



== Grouping JRadioButton Components in a ButtonGroup ==



<source lang="java">
import java.awt.BorderLayout;
import java.awt.Container;
import java.awt.GridLayout;
import javax.swing.BorderFactory;
import javax.swing.ButtonGroup;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JRadioButton;
import javax.swing.border.Border;
class RadioButtonUtils {
public static Container createRadioButtonGrouping(String elements[], String title) {
JPanel panel = new JPanel(new GridLayout(0, 1));
if (title != null) {
Border border = BorderFactory.createTitledBorder(title);
panel.setBorder(border);
}
ButtonGroup group = new ButtonGroup();
JRadioButton aRadioButton;
for (int i = 0, n = elements.length; i < n; i++) {
aRadioButton = new JRadioButton(elements[i]);
panel.add(aRadioButton);
group.add(aRadioButton);
}
return panel;
}
}
public class GroupJRadioButton {
private static final String sliceOptions[] = { "4", "8", "12", "16" };
private static final String crustOptions[] = { "A", "B", "C", "D" };
public static void main(String args[]) {
JFrame frame = new JFrame("Grouping Example");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
Container sliceContainer = RadioButtonUtils.createRadioButtonGrouping(sliceOptions,
"Slice Count");
Container crustContainer = RadioButtonUtils.createRadioButtonGrouping(crustOptions,
"Crust Type");
frame.add(sliceContainer, BorderLayout.WEST);
frame.add(crustContainer, BorderLayout.EAST);
frame.setSize(300, 200);
frame.setVisible(true);
}
}</source>



== Listening to JRadioButton Events with a ChangeListener ==

<p>when the selected radio button is armed, pressed, selected, or released</p>



<source lang="java">
import java.awt.GridLayout;
import javax.swing.AbstractButton;
import javax.swing.ButtonGroup;
import javax.swing.ButtonModel;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JRadioButton;
import javax.swing.event.ChangeEvent;
import javax.swing.event.ChangeListener;
public class JRadioButtonChangeListener {
public static void main(String args[]) {
JFrame frame = new JFrame("Grouping Example");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
JPanel panel = new JPanel(new GridLayout(0, 1));
ButtonGroup group = new ButtonGroup();
JRadioButton aRadioButton = new JRadioButton("A");
JRadioButton bRadioButton = new JRadioButton("B");
ChangeListener changeListener = new ChangeListener() {
public void stateChanged(ChangeEvent changEvent) {
AbstractButton aButton = (AbstractButton)changEvent.getSource();
ButtonModel aModel = aButton.getModel();
boolean armed = aModel.isArmed();
boolean pressed = aModel.isPressed();
boolean selected = aModel.isSelected();
System.out.println("Changed: " + armed + "/" + pressed + "/" +
selected);
}
};
panel.add(aRadioButton);
group.add(aRadioButton);
panel.add(bRadioButton);
group.add(bRadioButton);
aRadioButton.addChangeListener(changeListener);
bRadioButton.addChangeListener(changeListener);
frame.add(panel);
frame.setSize(300, 200);
frame.setVisible(true);
}

}</source>



== Listening to JRadioButton Events with an ActionListener ==



<source lang="java">
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.AbstractButton;
import javax.swing.ButtonGroup;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JRadioButton;
public class JRadioButtonActionListener {
public static void main(String args[]) {
JFrame frame = new JFrame("Grouping Example");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
JPanel panel = new JPanel(new GridLayout(0, 1));
ButtonGroup group = new ButtonGroup();
JRadioButton aRadioButton = new JRadioButton("A");
JRadioButton bRadioButton = new JRadioButton("B");
ActionListener sliceActionListener = new ActionListener() {
public void actionPerformed(ActionEvent actionEvent) {
AbstractButton aButton = (AbstractButton) actionEvent.getSource();
System.out.println("Selected: " + aButton.getText());
}
};
panel.add(aRadioButton);
group.add(aRadioButton);
panel.add(bRadioButton);
group.add(bRadioButton);
aRadioButton.addActionListener(sliceActionListener);
bRadioButton.addActionListener(sliceActionListener);

frame.add(panel);
frame.setSize(300, 200);
frame.setVisible(true);
}
}</source>



== Listening to JRadioButton Events with an ItemListener ==



<source lang="java">
import java.awt.GridLayout;
import java.awt.event.ItemEvent;
import java.awt.event.ItemListener;
import javax.swing.AbstractButton;
import javax.swing.ButtonGroup;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JRadioButton;
public class JRadioButtonItemListener {
public static void main(String args[]) {
JFrame frame = new JFrame("Grouping Example");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
JPanel panel = new JPanel(new GridLayout(0, 1));
ButtonGroup group = new ButtonGroup();
JRadioButton aRadioButton = new JRadioButton("A");
JRadioButton bRadioButton = new JRadioButton("B");
ItemListener itemListener = new ItemListener() {
String lastSelected;
public void itemStateChanged(ItemEvent itemEvent) {
AbstractButton aButton = (AbstractButton)itemEvent.getSource();
int state = itemEvent.getStateChange();
String label = aButton.getText();
String msgStart;
if (state == ItemEvent.SELECTED) {
if (label.equals(lastSelected)) {
msgStart = "Reselected -> ";
} else {
msgStart = "Selected -> ";
}
lastSelected = label;
} else {
msgStart = "Deselected -> ";
}
System.out.println(msgStart + label);
}
};
panel.add(aRadioButton);
group.add(aRadioButton);
panel.add(bRadioButton);
group.add(bRadioButton);
aRadioButton.addItemListener(itemListener);
bRadioButton.addItemListener(itemListener);
frame.add(panel);
frame.setSize(300, 200);
frame.setVisible(true);
}

}</source>



== Reference to the last selected item and check for reselection ==



<source lang="java">
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.AbstractButton;
import javax.swing.ButtonGroup;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JRadioButton;
public class JRadioButtonActionListenerSelectedItem {
public static void main(String args[]) {
JFrame frame = new JFrame("Grouping Example");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
JPanel panel = new JPanel(new GridLayout(0, 1));
ButtonGroup group = new ButtonGroup();
JRadioButton aRadioButton = new JRadioButton("A");
JRadioButton bRadioButton = new JRadioButton("B");
ActionListener crustActionListener = new ActionListener() {
String lastSelected;
public void actionPerformed(ActionEvent actionEvent) {
AbstractButton aButton = (AbstractButton) actionEvent.getSource();
String label = aButton.getText();
String msgStart;
if (label.equals(lastSelected)) {
msgStart = "Reselected: ";
} else {
msgStart = "Selected: ";
}
lastSelected = label;
System.out.println(msgStart + label);
}
};
panel.add(aRadioButton);
group.add(aRadioButton);
panel.add(bRadioButton);
group.add(bRadioButton);
aRadioButton.addActionListener(crustActionListener);
bRadioButton.addActionListener(crustActionListener);
frame.add(panel);
frame.setSize(300, 200);
frame.setVisible(true);
}
}</source>



== Using JRadioButton ==



<source lang="java">
import java.awt.FlowLayout;
import javax.swing.ButtonGroup;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JRadioButton;
public class JRadioButtonTest {
public static void main(String[] args) {
JFrame.setDefaultLookAndFeelDecorated(true);
JFrame frame = new JFrame("JRadioButton Test");
frame.setLayout(new FlowLayout());
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
JRadioButton button1 = new JRadioButton("Red");
JRadioButton button2 = new JRadioButton("Green");
JRadioButton button3 = new JRadioButton("Blue");
ButtonGroup colorButtonGroup = new ButtonGroup();
colorButtonGroup.add(button1);
colorButtonGroup.add(button2);
colorButtonGroup.add(button3);
button1.setSelected(true);
frame.add(new JLabel("Color:"));
frame.add(button1);
frame.add(button2);
frame.add(button3);
frame.pack();
frame.setVisible(true);
}
}</source>

← Предыдущая	Версия 17:44, 31 мая 2010
(нет различий)

Java Tutorial/Swing/JRadioButton - История изменений

в 17:44, 31 мая 2010

Admin: 1 версия