我很新JFrame，我試圖啟用和禁用JCheckbox（或）JCheckbox面板取決于單選按鈕選擇。
這里 ：
如果選擇了“是”單選按鈕，
JCheckboxs面板需要被禁用并且Textbox應該被啟用。如果選擇了“否”單選按鈕，則
JCheckboxs需要啟用并Textbox應禁用。
我可以啟用和禁用文本框，但我不知道如何控制 JCheckboxs
這是我的代碼
import java.awt.Component;
import java.awt.Container;
import java.awt.Dimension;
import java.awt.EventQueue;
import java.awt.FlowLayout;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.Insets;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.HashSet;
import java.util.Set;
import javax.swing.ButtonGroup;
import javax.swing.JButton;
import javax.swing.JCheckBox;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JRadioButton;
import javax.swing.JScrollPane;
import javax.swing.JTextField;
import javax.swing.SwingUtilities;
import javax.swing.border.EmptyBorder;
import javax.swing.border.TitledBorder;
public class Test {
public static void main(String[] args) {
new Test();
}
public Test() {
EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
JFrame frame = new JFrame();
frame.add(new TestPane());
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
});
}
public class TestPane extends JPanel {
private Set<String> selectedValues = new HashSet<>(8);
// JPanel panelCheckBox = new JPanel(new WrapLayout(WrapLayout.LEADING));
public TestPane() {
setBorder(new EmptyBorder(16, 16, 16, 16));
setLayout(new GridBagLayout());
JTextField textField = new JTextField(40);
JPanel panelCheckBox = new JPanel(new WrapLayout(WrapLayout.LEADING));
//testing start here
// DisabledPanel disabledPanel = new DisabledPanel(panelCheckBox);
// DisabledPanel disable = new DisabledPanel(panelCheckBox);
//disabledPanel.setEnabled(false);
JRadioButton yes = new JRadioButton("yes");
yes.setSelected(true);
yes.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
if (yes.isSelected()) {
textField.setEnabled(true);
panelCheckBox.setEnabled(false);
}
}
});
JRadioButton no = new JRadioButton("No");
no.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
if (no.isSelected()) {
textField.setText("");
textField.setEnabled(false);
}
}
});
ButtonGroup bg = new ButtonGroup();
bg.add(yes);
bg.add(no);
JPanel enterClassPane = new JPanel(new GridBagLayout());
enterClassPane.setBorder(new TitledBorder(null, "Enetr Your MetaClass", TitledBorder.LEADING, TitledBorder.TOP, null, null));
enterClassPane.add(yes);
enterClassPane.add(no);
// JPanel panelCheckBox = new JPanel(new WrapLayout(WrapLayout.LEADING));
//testing start here
// DisabledPanel disabledPanel = new DisabledPanel(panelCheckBox);
//disabledPanel.setEnabled(false);
int numberCheckBox = 10;
JCheckBox[] checkBoxList = new JCheckBox[numberCheckBox];
for (int i = 0; i < numberCheckBox; i ) {
checkBoxList[i] = new JCheckBox("Diagram " i);
panelCheckBox.add(checkBoxList[i]);
checkBoxList[i].addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
System.out.println("Selected Diagram " e.getActionCommand());
if (e.getSource() instanceof JCheckBox) {
JCheckBox cb = (JCheckBox) e.getSource();
if (cb.isSelected()) {
selectedValues.add(cb.getActionCommand());
} else {
selectedValues.remove(cb.getActionCommand());
}
}
}
});
}
JPanel classPane = new JPanel(new GridBagLayout());
classPane.setBorder(new TitledBorder(null, "Enter Meta Class", TitledBorder.LEADING, TitledBorder.TOP, null, null));
classPane.add(textField);
JPanel actionsPane = new JPanel(new GridBagLayout());
JButton btnCancel = new JButton("Cancel");
btnCancel.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
System.exit(1);
}
});
JButton btnOkay = new JButton("Okay");
btnOkay.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
//Text field
System.out.println(textField.getText());
for (String command : selectedValues) {
System.out.println(command);
}
}
});
actionsPane.add(btnOkay);
actionsPane.add(btnCancel);
GridBagConstraints gbc = new GridBagConstraints();
gbc.insets = new Insets(4, 4, 4, 4);
gbc.gridwidth = gbc.REMAINDER;
gbc.fill = gbc.HORIZONTAL;
add(enterClassPane, gbc);
add(new JScrollPane(panelCheckBox), gbc);
add(classPane, gbc);
add(actionsPane, gbc);
}
}
public class WrapLayout extends FlowLayout {
private Dimension preferredLayoutSize;
public WrapLayout() {
super();
}
public WrapLayout(int align) {
super(align);
}
public WrapLayout(int align, int hgap, int vgap) {
super(align, hgap, vgap);
}
@Override
public Dimension preferredLayoutSize(Container target) {
return layoutSize(target, true);
}
@Override
public Dimension minimumLayoutSize(Container target) {
Dimension minimum = layoutSize(target, false);
minimum.width -= (getHgap() 1);
return minimum;
}
private Dimension layoutSize(Container target, boolean preferred) {
synchronized (target.getTreeLock()) {
int targetWidth = target.getSize().width;
Container container = target;
while (container.getSize().width == 0 && container.getParent() != null) {
container = container.getParent();
}
targetWidth = container.getSize().width;
if (targetWidth == 0) {
targetWidth = Integer.MAX_VALUE;
}
int hgap = getHgap();
int vgap = getVgap();
Insets insets = target.getInsets();
int horizontalInsetsAndGap = insets.left insets.right (hgap * 2);
int maxWidth = targetWidth - horizontalInsetsAndGap;
// Fit components into the allowed width
Dimension dim = new Dimension(0, 0);
int rowWidth = 0;
int rowHeight = 0;
int nmembers = target.getComponentCount();
for (int i = 0; i < nmembers; i ) {
Component m = target.getComponent(i);
if (m.isVisible()) {
Dimension d = preferred ? m.getPreferredSize() : m.getMinimumSize();
// Can't add the component to current row. Start a new row.
if (rowWidth d.width > maxWidth) {
addRow(dim, rowWidth, rowHeight);
rowWidth = 0;
rowHeight = 0;
}
// Add a horizontal gap for all components after the first
if (rowWidth != 0) {
rowWidth = hgap;
}
rowWidth = d.width;
rowHeight = Math.max(rowHeight, d.height);
}
}
addRow(dim, rowWidth, rowHeight);
dim.width = horizontalInsetsAndGap;
dim.height = insets.top insets.bottom vgap * 2;
Container scrollPane = SwingUtilities.getAncestorOfClass(JScrollPane.class, target);
if (scrollPane != null && target.isValid()) {
dim.width -= (hgap 1);
}
return dim;
}
}
private void addRow(Dimension dim, int rowWidth, int rowHeight) {
dim.width = Math.max(dim.width, rowWidth);
if (dim.height > 0) {
dim.height = getVgap();
}
dim.height = rowHeight;
}
}
}
uj5u.com熱心網友回復：
您將需要更改代碼的某些部分：
將
numberCheckBox和checkBoxList作為全域變數移到內部TestPane，并重命名numberCheckBox為NUMBER_CHECK_BOX，因為它將成為一個常量，所以你的代碼應該是這樣的public class TestPane extends JPanel { private static final int NUMBER_CHECK_BOX = 10; JCheckBox[] checkBoxList = new JCheckBox[NUMBER_CHECK_BOX]; ... }現在，創建一個方法來切換
setEnabled(...)面板中的每個復選框private void toggleCheckBoxesEnabled(boolean enabled) { for (JCheckBox box : checkBoxList) { box.setEnabled(enabled); } }現在只需在每個按鈕內呼叫它'
actionListenersyes.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent e) { if (yes.isSelected()) { textField.setEnabled(true); toggleCheckBoxesEnabled(true); } } }); no.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent e) { if (no.isSelected()) { textField.setText(""); textField.setEnabled(false); toggleCheckBoxesEnabled(false); } } });
順便說一句，別忘了打電話 frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE)
如何在初始時禁用復選框
要禁用它們，您需要禁用checkboxes創建它們的位置：
for (int i = 0; i < numberCheckBox; i ) {
checkBoxList[i] = new JCheckBox("Diagram " i);
checkBoxList[i].setEnabled(false); // Add this line
panelCheckBox.add(checkBoxList[i]);
...
}
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