[英]Inputting data to JTextField by pressing JButton
我編寫了一個程序，根據用戶選擇的難度級別創建數獨板。 有一個使用 JFrame 和 JPanel 的基本 GUI。 該板本身是使用 JTextFields 的 2D 數組構建的，以允許用戶進行編輯，我制作了一個代表數字 1-9 的 JButtons 表。 我正在努力做到這一點，所以當我的 cursor 在相關文本字段上時按下數字按鈕時，它會將該數字輸入到該字段中。 我認為我定義按鈕的方式存在問題，但我會喜歡手。 順便說一句，這是我的第一個官方堆棧溢出問題，所以提前感謝所有幫助的人:)
/*Java Program to solve Sudoku problem using Backtracking*/
import javax.swing.*;
import javax.swing.border.Border;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.*;
public class Solver extends Board {
Solver(int N, int K) {
super(N, K);
}
private static void createWindow() {
JFrame frame = new JFrame("Sudoku");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
createUI(frame);
frame.setSize(250, 80);
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
private static void createUI(final JFrame frame) {
JPanel panel = new JPanel();
LayoutManager layout = new FlowLayout();
panel.setLayout(layout);
JButton button = new JButton("Play");
button.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
String result = (String) JOptionPane.showInputDialog(
frame,
"Difficulty Glossary:\n\n Hard - 50/81 blank spaces\n Medium - 35/81 blank spaces\n Easy - 20/81 blank spaces\n\nChoose your desired difficulty:\n\tHard: 1\n\tMedium: 2\n\tEasy: 3\nIf your input doesn't match one of these digits, the board generated will be on easy mode.",
"Difficulty Glossary",
JOptionPane.PLAIN_MESSAGE,
null,
null,
"3"
);
optionBoard();
play(Integer.parseInt(result));
}
});
panel.add(button);
frame.getContentPane().add(panel, BorderLayout.CENTER);
}
public static void optionBoard(){
}
public static void play(int level) {
int N = 9, K = 0;
switch (level) {
case 1:
K = 50;
break;
case 2:
K = 35;
break;
default:
K = 20;
break;
}
Solver sudoku = new Solver(N, K);
sudoku.fillValues();
createBoard(sudoku.puzzle);
}
public static void createBoard(int[][] puzzle) {
final Border fieldBorder = BorderFactory.createLineBorder(Color.BLACK);
final JPanel grid = new JPanel(new GridLayout(9, 9));
for (int i = 0; i < 9; i++) {
for (int j = 0; j < 9; j++) {
final JTextField field = new JTextField(2);
if (puzzle[i][j] != 0) {
field.setText(puzzle[i][j] + "");
} else {
field.setText("");
}
field.setHorizontalAlignment(JTextField.CENTER); //Center text horizontally in the text field.
field.setBorder(fieldBorder); //Add the colored border.
grid.add(field);
}
}
final JPanel digits = new JPanel(new GridLayout(3, 3));
int num=1;
for (int i = 1; i < 4; i++) {
for (int j = 1; j < 4; j++) {
final JButton digit = new JButton(num+"");
num++;
digits.add(digit);
}
}
final JPanel centeredGrid = new JPanel(new GridBagLayout());
centeredGrid.add(digits);
centeredGrid.add(grid);
final JFrame frame = new JFrame("Sudoku Board");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.getContentPane().add(centeredGrid);
frame.setSize(400,400);
frame.setVisible(true);
JButton button = new JButton("Check");
button.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
}
});
// centeredGrid.add(button);
}
// Driver code
public static void main(String[] args) {
createWindow();
}
}
我只提供了相關的 GUI class，因為構建電路板的數學邏輯部分是可靠的並且工作正常。 這就是板子 class 是什么。
一種方法可能是：
ArrayList<JTextField>中，以便稍后獲取它們，因為您可能需要在游戲期間訪問它們private JTextField selectedField = null; ，最初設置為null 。 這將指向最后一個被點擊的 JTextField（最后一個獲得焦點）此外，如果您需要更多幫助，請考慮創建並發布有效的MRE 。 您當前的代碼無法為我們編譯。
概念證明（和MRE示例）：
import java.awt.Color;
import java.awt.Font;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.FocusAdapter;
import java.awt.event.FocusEvent;
import java.util.ArrayList;
import java.util.List;
import javax.swing.*;
public class Solver2 extends JPanel {
private static final float FONT_SIZE = 24f;
private int gridEdgeSize = 9;
private List<JTextField> fieldList = new ArrayList<>();
private JTextField selectedField = null;
public Solver2() {
JPanel gridPanel = new JPanel(new GridLayout(gridEdgeSize, gridEdgeSize, 2, 2));
gridPanel.setBorder(BorderFactory.createLineBorder(Color.BLACK, 2));
gridPanel.setBackground(Color.BLACK);
for (int i = 0; i < gridEdgeSize; i++) {
for (int j = 0; j < gridEdgeSize; j++) {
JTextField textField = new JTextField(2);
textField.setHorizontalAlignment(SwingConstants.CENTER);
textField.setFont(textField.getFont().deriveFont(Font.BOLD, FONT_SIZE));
textField.setBorder(null);
textField.addFocusListener(new TextFieldFocusListener());
gridPanel.add(textField);
fieldList.add(textField);
}
}
JPanel numberPanel = new JPanel(new GridLayout(0, 3));
for (int i = 1; i < 10; i++) {
String text = String.valueOf(i);
JButton button = new JButton(text);
button.setFont(button.getFont().deriveFont(Font.BOLD, FONT_SIZE));
button.addActionListener(e -> buttonListener(e));
numberPanel.add(button);
}
setLayout(new GridLayout(1, 2));
add(gridPanel);
add(numberPanel);
}
private void buttonListener(ActionEvent e) {
String text = e.getActionCommand();
if (selectedField != null) {
selectedField.setText(text);
}
}
private class TextFieldFocusListener extends FocusAdapter {
@Override
public void focusGained(FocusEvent e) {
selectedField = (JTextField) e.getComponent();
}
}
public static void main(String[] args) {
SwingUtilities.invokeLater(() -> {
Solver2 mainPanel = new Solver2();
JFrame frame = new JFrame("GUI");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.add(mainPanel);
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
});
}
}
如果您想限制 JTextField 允許鍵盤或復制/粘貼輸入，那么一種方法是使用添加到每個 JTextField 文檔的 DocumentFilter。
你可以給 class 一個私有的 boolean 字段，比如說，
public class Solver2 extends JPanel {
// .....
private boolean blockTextInput = true;
以及擴展 DocumentFilter 的私有嵌套 class。 只要 blockTextInput 為真，此 class 將阻止文檔允許字符串插入、刪除或替換：
private class MyDocFilter extends DocumentFilter {
@Override
public void insertString(FilterBypass fb, int offset, String string, AttributeSet attr)
throws BadLocationException {
if (blockTextInput) {
return;
}
super.insertString(fb, offset, string, attr);
}
@Override
public void remove(FilterBypass fb, int offset, int length) throws BadLocationException {
if (blockTextInput) {
return;
}
super.remove(fb, offset, length);
}
@Override
public void replace(FilterBypass fb, int offset, int length, String text, AttributeSet attrs)
throws BadLocationException {
if (blockTextInput) {
return;
}
super.replace(fb, offset, length, text, attrs);
}
}
然后在 JTextField 創建循環中，設置過濾器：
for (int i = 0; i < gridEdgeSize; i++) {
for (int j = 0; j < gridEdgeSize; j++) {
JTextField textField = new JTextField(2);
textField.setHorizontalAlignment(SwingConstants.CENTER);
textField.setFont(textField.getFont().deriveFont(Font.BOLD, FONT_SIZE));
textField.setBorder(null);
textField.addFocusListener(new TextFieldFocusListener());
// ***** here ****
((PlainDocument) textField.getDocument()).setDocumentFilter(new MyDocFilter());
gridPanel.add(textField);
fieldList.add(textField);
}
}
然后在設置JTextField的文本前后改變JButton的ActionListeners的數量來改變blockTextInput：
private void buttonListener(ActionEvent e) {
String text = e.getActionCommand();
if (selectedField != null) {
blockTextInput = false;
selectedField.setText(text);
blockTextInput = true;
}
}
完畢
該程序的最新迭代使用單個 FocusListener 和 DocumentFilter，並結合了 Rob Camick 的建議，即使用 TextAction 作為按鈕的 ActionListener：
import java.awt.Color;
import java.awt.Font;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.util.ArrayList;
import java.util.List;
import javax.swing.*;
import javax.swing.text.AttributeSet;
import javax.swing.text.BadLocationException;
import javax.swing.text.DocumentFilter;
import javax.swing.text.JTextComponent;
import javax.swing.text.PlainDocument;
import javax.swing.text.TextAction;
@SuppressWarnings("serial")
public class Solver3 extends JPanel {
private static final float FONT_SIZE = 24f;
private int gridEdgeSize = 9;
private List<JTextField> fieldList = new ArrayList<>();
private boolean blockTextInput = true;
private MyTextAction myTextAction = new MyTextAction("");
private JPanel outerGridPanel = new JPanel(new GridLayout(3, 3, 3, 3));
private JPanel[][] innerGridPanels = new JPanel[3][3];
public Solver3() {
outerGridPanel.setBackground(Color.BLACK);
outerGridPanel.setBorder(BorderFactory.createLineBorder(Color.BLACK, 4));
for (int i = 0; i < 3; i++) {
for (int j = 0; j < 3; j++) {
innerGridPanels[i][j] = new JPanel(new GridLayout(3, 3, 1, 1));
innerGridPanels[i][j].setBackground(Color.BLACK);
outerGridPanel.add(innerGridPanels[i][j]);
}
}
for (int i = 0; i < gridEdgeSize; i++) {
for (int j = 0; j < gridEdgeSize; j++) {
JTextField textField = new JTextField(2);
textField.setHorizontalAlignment(SwingConstants.CENTER);
textField.setFont(textField.getFont().deriveFont(Font.BOLD, FONT_SIZE));
textField.setBorder(null);
((PlainDocument) textField.getDocument()).setDocumentFilter(new MyDocFilter());
innerGridPanels[i / 3][j / 3].add(textField);
fieldList.add(textField);
}
}
JPanel numberPanel = new JPanel(new GridLayout(0, 3));
for (int i = 1; i < 10; i++) {
String text = String.valueOf(i);
JButton button = new JButton(text);
button.setFont(button.getFont().deriveFont(Font.BOLD, 2 * FONT_SIZE));
button.addActionListener(myTextAction);
numberPanel.add(button);
}
setLayout(new GridLayout(1, 2));
add(outerGridPanel);
add(numberPanel);
}
private class MyTextAction extends TextAction {
public MyTextAction(String name) {
super(name);
}
@Override
public void actionPerformed(ActionEvent e) {
String text = e.getActionCommand();
JTextComponent selectedComponent = getFocusedComponent();
if (selectedComponent != null) {
blockTextInput = false;
selectedComponent.setText(text);
blockTextInput = true;
}
}
}
private class MyDocFilter extends DocumentFilter {
@Override
public void insertString(FilterBypass fb, int offset, String string, AttributeSet attr)
throws BadLocationException {
if (blockTextInput) {
return;
}
super.insertString(fb, offset, string, attr);
}
@Override
public void remove(FilterBypass fb, int offset, int length) throws BadLocationException {
if (blockTextInput) {
return;
}
super.remove(fb, offset, length);
}
@Override
public void replace(FilterBypass fb, int offset, int length, String text, AttributeSet attrs)
throws BadLocationException {
if (blockTextInput) {
return;
}
super.replace(fb, offset, length, text, attrs);
}
}
public static void main(String[] args) {
SwingUtilities.invokeLater(() -> {
Solver3 mainPanel = new Solver3();
JFrame frame = new JFrame("GUI");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.add(mainPanel);
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
});
}
}
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