Question

我正在尝试在JLabel上检测MouseEvent。我有一个JLabel数组（candidateLabel = new JLabel [9]）。他的一些JLabel包含一些数字，有些则没有。如果我离开点击并且它不为空，我已经实现了添加文本的选项。我现在希望能够在我的空标签上检测到正确的点击，但这似乎不会发生。

以下是代码：

package sudoku.view;

import java.awt.CardLayout;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.Font;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.GridLayout;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.util.Set;

import javax.swing.BorderFactory;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.SwingUtilities;


public class CaseComponent extends JPanel {

    private static final long serialVersionUID = 1L;
    private static final String CANDIDATES = "candidate";
    private static final String DIGIT = "digit";
    private static final int CASE_DIM = 60;
    private static final int DIGIT_SIZE = 38;
    private MouseAdapter candidatesMouseAdapter;
    private MouseAdapter digitMouseAdapter;
    private GridBagConstraints gridBagConstraint;
    private Color caseColor;
    private Color initialCaseColor;
    private JLabel[] candidatesLabel;
    private JLabel digitLabel;
    private String currentState;
    private boolean modifiable;

    public CaseComponent(Color caseColor, String currentState) {
        super();
        this.initialCaseColor = caseColor;
        this.caseColor = caseColor;
        this.currentState = currentState;
        this.modifiable = true;
        setConfiguration();
        createView();
        placeComponents();
        createController();
    }

    // REQUETES


    public JLabel getDigitLabel() {
        return digitLabel;
    }

    public JLabel[] getCandidatesLabel() {
        return candidatesLabel; 
    }

    public Color getInitialCaseColor() {
        return initialCaseColor;
    }

    public static String getCandidateState() {
        return CANDIDATES;
    }

    public static String getDigitState() {
        return DIGIT;
    }

    public String getCurrentState() {
        return currentState;
    }

    public String getDigitText() {
        return digitLabel.getText();
    }

    public boolean isModifiable() {
        return modifiable;
    }


    // COMMANDES

    public void setModifiable(boolean modifiable) {
        this.modifiable = modifiable;
    }

    public void setCandidatesLabel(Set<Integer> candidates) {
        for (int i = 0; i < 9; ++i) {
            candidatesLabel[i].setText("");
        }
        for (Integer i : candidates) {
            candidatesLabel[i - 1].setText(i + "");
        }
    }

    public void changeLabelForeground(Color color) {
        digitLabel.setForeground(color);

        for (int i = 0; i < candidatesLabel.length; ++i) {
            candidatesLabel[i].setForeground(color);
        }
    }

    public void changeDisplay() {
        if (currentState.equals(CANDIDATES)) {
            candidateDisplay();
        } else {
            digitDisplay();
        }
    }

    public void digitDisplay() {
        CardLayout cl = (CardLayout) getLayout();
        cl.show(this, DIGIT);
        currentState = DIGIT;
    }

    public void candidateDisplay() {
        CardLayout cl = (CardLayout) getLayout();
        cl.show(this, CANDIDATES);
        currentState = CANDIDATES;
    }

    public void addMouseListener() {
        digitLabel.addMouseListener(digitMouseAdapter);
        for (int i = 0; i < 9; i++) {
            candidatesLabel[i].addMouseListener(candidatesMouseAdapter);
        }
    }

    public void removeMouseListener() {
        digitLabel.removeMouseListener(digitMouseAdapter);
        for (int i = 0; i < 9; i++) {
            candidatesLabel[i].removeMouseListener(candidatesMouseAdapter);
        }
    }

    // OUTILS

    private void setConfiguration() {
        setLayout(new CardLayout());
        setBorder(BorderFactory.createLineBorder(Color.DARK_GRAY));
        setPreferredSize(new Dimension(CASE_DIM, CASE_DIM));
        setBackground(caseColor);
    }

    private void createView() {
        gridBagConstraint = new GridBagConstraints();
        candidatesLabel = new JLabel[9];
        for (int i = 0; i < 9; i++) {
            candidatesLabel[i] = new JLabel("");
            candidatesLabel[i].setPreferredSize(new Dimension(50, 50));
        }

        digitLabel = new JLabel();
        digitLabel.setFont(new Font("TimesRoman", Font.PLAIN, DIGIT_SIZE));
    }

    private void placeComponents() {
        JPanel p = new JPanel(new GridLayout(3, 3));
        for (int i = 0; i < 9; i++) {
            JPanel q = new JPanel(new GridBagLayout()); {
                q.add(candidatesLabel[i], gridBagConstraint);
            }
            q.setOpaque(false);
            p.add(q);  
        }
        p.setOpaque(false);
        add(p, CANDIDATES);

        p = new JPanel(new GridBagLayout()); {
            p.add(digitLabel, gridBagConstraint);
        }
        p.setOpaque(false);
        add(p, DIGIT);
    }

    private void createController() {
        digitMouseAdapter = new MouseAdapter() {
            @Override
            public void mousePressed(MouseEvent e) {
                if (SwingUtilities.isRightMouseButton(e) 
                        && isModifiable()) {
                    candidateDisplay();
                }
            }
        };
        digitLabel.addMouseListener(digitMouseAdapter);


        candidatesMouseAdapter = new MouseAdapter() {
            @Override
            public void mousePressed(MouseEvent e) {
                JLabel source = (JLabel) e.getSource();
                if (SwingUtilities.isLeftMouseButton(e)) {
                    System.out.print(source.getText().equals(""));
                    if (source.getText().equals("")) {
                        for (int i = 0; i < candidatesLabel.length; ++i) {
                            if (candidatesLabel[i].equals(source)) {
                                candidatesLabel[i].setText("" + (i - 1));
                            }
                        }
                    } else {
                        digitDisplay();
                        digitLabel.setText(source.getText());
                    }
                } else if (SwingUtilities.isRightMouseButton(e)) {
                    for (int i = 0; i < candidatesLabel.length; ++i) {
                        if (candidatesLabel[i].equals(source)) {
                            candidatesLabel[i].setText("");
                        }
                    }
                }
            }
        };
        for (int i = 0; i < 9; i++) {
            candidatesLabel[i].addMouseListener(candidatesMouseAdapter);
        }
    }
}

这里，当我在空的JLabel上单击左键时，没有任何反应（System.out.println（）没有显示）。

有什么想法吗？

Answer 1

如果我点击了鼠标并且它不是空的话，我已经实现了添加文字的选项

看起来你倒退了;如果您左键单击 IS 为空的正方形

，它将添加文本

            if (SwingUtilities.isLeftMouseButton(e)) {
                ...
                if (source.getText().equals("")) {
                    for (int i = 0; i < candidatesLabel.length; ++i) {
                        if (candidatesLabel[i].equals(source)) {
                            candidatesLabel[i].setText("" + (i - 1));
                        }
                    }
                }

我现在希望能够在空标签上检测到正确的点击次数

对我来说这很有效。右键单击空标签并且文本设置为为空

时，您看不到任何更改

              else if (SwingUtilities.isRightMouseButton(e)) {
                for (int i = 0; i < candidatesLabel.length; ++i) {
                    if (candidatesLabel[i].equals(source)) {
                        candidatesLabel[i].setText("");
                    }
                }

当我在空JLabel上单击左键时，没有任何反应（System.out.println（）没有显示）。

如上所示，单击空标签将在其中设置一些文本。左键单击其中包含文本的标签将导致UI从候选视图切换到数字视图

            if (SwingUtilities.isLeftMouseButton(e)) {
                ...
                if (source.getText().equals("")) {
                    ...
                } else {
                    digitDisplay();
                    digitLabel.setText(source.getText());
                }

这有它自己的问题，因为digitLabel没有文本，它的大小没有设置所以它是width = 0和height = 0所以它的mousePressed监听器永远不会被执行，你永远不能回到候选人观点

检测空JLabel

1 个答案: