java - 直到我用鼠标悬停在 JButtons 上才会出现
问题描述
我创建的网格有问题。在我将鼠标悬停在它们上之前,此按钮smallerGrid
不会出现。每个smallerGrid
都由一个 3x3 网格组成,该网格适合一个biggerGrid
包含较小网格的也是 3x3 网格。这是我如何构建数独网格的简要说明。您将在下面找到代码。先感谢您。
import java.awt.*;
import javax.swing.*;
public class MyGridLayout {
private int filledFields = 0;
private JFrame mainFrame;
private JPanel panelForSolvingButton;
private JPanel smallerGridPanel;
private boolean solvingButtonAppeared = false;
SudokuCell[][] biggerGrid = new SudokuCell[10][10];
MyGridLayout() {
mainFrame = new JFrame("sudoku-solver");
mainFrame.setLayout(new BorderLayout());
smallerGridPanel = new JPanel(new GridLayout(3, 3));
mainFrame.add(smallerGridPanel, BorderLayout.CENTER);
panelForSolvingButton = new JPanel();
panelForSolvingButton.setLayout(new FlowLayout(FlowLayout.RIGHT));
mainFrame.add(panelForSolvingButton, BorderLayout.SOUTH);
mainFrame.pack();
mainFrame.setSize(600,600);
mainFrame.setLocationRelativeTo(null);
mainFrame.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
mainFrame.setResizable(false);
addRegularButtons();
}
void addRegularButtons() {
int currentCol = 0;
int currentRow = 0;
int smallerGridFirstCol = 0;
int firstRowOfLayer = 0;
for (int layerOfGrids = 0; layerOfGrids < 3; ++layerOfGrids) {
for (int gridOfLayer = 0; gridOfLayer < 3; ++gridOfLayer) {
JComponent smallerGrid = new JPanel(new GridLayout(3, 3));
smallerGrid.setBorder(BorderFactory.createLineBorder(Color.BLACK));
smallerGridPanel.add(smallerGrid);
for (int j = 0; j < 3; ++j) {
for (int k = 0; k < 3; ++k) {
var cell = new SudokuCell(currentRow, currentCol);
smallerGrid.add(cell);
biggerGrid[currentRow][currentCol++] = cell;
cell.addActionListener(new CellActionListener(this));
}
currentRow++;
currentCol = smallerGridFirstCol;
}
smallerGridPanel.revalidate();
currentRow = firstRowOfLayer;
smallerGridFirstCol += 3;
currentCol = smallerGridFirstCol;
}
firstRowOfLayer += 3;
currentRow = firstRowOfLayer;
smallerGridFirstCol = currentCol = 0;
}
mainFrame.revalidate();
mainFrame.setVisible(true);
}
// checking if the solving process can begin
// (filled fields must at least reach 17)
void makeSolveButtonAppear() {
JButton solveButton = new JButton();
solveButton.setBackground(Color.white);
solveButton.setFont(new Font("Arial", Font.PLAIN, 20));
solveButton.setOpaque(false);
solveButton.setText("Solve ?");
panelForSolvingButton.add(solveButton);
}
public boolean isSolvingButtonAppeared() {
return solvingButtonAppeared;
}
public void setSolvingButtonAppeared(boolean solvingButtonAppeared) {
this.solvingButtonAppeared = solvingButtonAppeared;
}
public int getFilledFields() {
return filledFields;
}
public void setFilledFields(int filledFields) {
this.filledFields = filledFields;
}
public JPanel getPanelForSolvingButton() {
return panelForSolvingButton;
}
public static void main(String[] args) {
var gridLayout = new MyGridLayout();
}
}
package mainFrame;
import java.awt.*;
import java.util.HashMap;
import java.util.Map;
import javax.swing.*;
import javax.swing.border.Border;
import javax.swing.border.MatteBorder;
public class SudokuCell extends JButton {
private int x;
private int y;
public SudokuCell(int x, int y) {
this.x = x;
this.y = y;
setBackground(Color.white);
setOpaque(true);
setFont(new Font("Arial", Font.PLAIN, 20));
}
@Override
public int getX() {
return x;
}
@Override
public int getY() {
return y;
}
}
package mainFrame;
import javax.swing.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
public class CellActionListener implements ActionListener {
private int clicked = 0;
MyGridLayout currentGrid;
CellActionListener(MyGridLayout currentGrid) {
this.currentGrid = currentGrid;
}
@Override
public void actionPerformed(ActionEvent e) {
if(clicked ==0) currentGrid.setFilledFields(currentGrid.getFilledFields()+1);
//clicked (number of clicks) must remain between 0 and 9
clicked = (clicked % 9) + 1;
((JButton) e.getSource()).setText(Integer.toString(clicked));
//first click on the button means an entry has been made
//which means one less needed filledField out of 17
if(!currentGrid.isSolvingButtonAppeared() && currentGrid.getFilledFields() >= 17) {
currentGrid.makeSolveButtonAppear();
currentGrid.setSolvingButtonAppeared(true);
}
}
}```
解决方案
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