单击时更改JButton文本

Question

我创建了一个扩展JDialog的类,我有一些复选框和3个按钮:accept,cancel和select all.

当用户单击全选时,应检查每个复选框,如果再次单击,则应取消选中每个复选框.这工作正常,但我也希望按钮的文本在"全选"和"取消全选"之间切换.我在那里遇到了麻烦,所以当用户点击按钮并且文本更改为"取消全选"时,该按钮会消失.

我把课程简化为最简单的形式:

    public class NodeSelectionCheckBoxJDialog extends JDialog {
    public enum Options {ACEPT, CANCEL};
    private Options selectedOption;
    private JButton allButton;
    private boolean allCheckBoxesSelected;
    private JButton aceptButton;

    public NodeSelectionCheckBoxJDialog(){
        super(MainFrame.getInstance());
        this.setTitle("Select nodes to apply");
        this.setModal(true);

        selectedOption = Options.CANCEL;
        nodeCheckBoxesSet = new HashSet<NodeCheckBox>();

        try {
            initComponents();
        } catch (Exception e) {
            JOptionPane.showMessageDialog(null, e.getMessage(), "Error", JOptionPane.ERROR_MESSAGE);
        }

        this.pack();
        this.setLocationRelativeTo(null);
        this.setVisible(true);
    }

    private void initComponents() throws Exception {
        this.getContentPane().add(createActionButtons(), BorderLayout.SOUTH);
    }

    private Component createActionButtons() {
        JPanel buttonsPanel = new JPanel();
        allCheckBoxesSelected = false;
        aceptButton = new JButton("Accept");
        aceptButton.setEnabled(false);
        buttonsPanel.add(aceptButton);
        aceptButton.addActionListener(new ActionListener() {

            @Override
            public void actionPerformed(ActionEvent e) {
                selectedOption = Options.ACEPT;
                dispose();
            }
        });

        JButton cancelButton = new JButton("Cancel");
        buttonsPanel.add(cancelButton);
        cancelButton.addActionListener(new ActionListener() {

            @Override
            public void actionPerformed(ActionEvent e) {
                selectedOption = Options.CANCEL;
                dispose();
            }
        });

        allButton = new JButton("Select all");
        buttonsPanel.add(allButton);
        allButton.addActionListener(new ActionListener() {

            @Override
            public void actionPerformed(ActionEvent e) {
                if(allCheckBoxesSelected){
                    allCheckBoxesSelected = false;
                    allButton.setText("Select all");
                } else {
                    allCheckBoxesSelected = true;
                    allButton.setText("Unselect all");
                }
            }
        });

        return buttonsPanel;
    }
}

我看不出有什么不对.有帮助吗？

Answer 1

按钮不会消失,只是变得太宽而无法放入窗口.只需在更改按钮标签时重新绘制组件:

@Override
public void actionPerformed(ActionEvent e) {
    if(allCheckBoxesSelected){
        allCheckBoxesSelected = false;
        allButton.setText("Select all");
    } else {
        allCheckBoxesSelected = true;
        allButton.setText("Unselect all");
        NodeSelectionCheckBoxJDialog.this.pack();
    }
}