java - 在 JPanel 中添加或删除 JTextPane onclick of JToggle Button

Question

我有一个 JDialog，其中有一个名为“dialogPane”的 Main Jpanel。

此 JPanel“dialogPane”有以下 2 个 JPanel

包含 JTextArea 的 ContentPanel
buttonBar 包含进度条和一个切换按钮。

现在我的用例是

单击切换按钮 On/Off 时，应将 TextArea 设置为隐藏（打开）/显示（关闭）。
单击切换按钮时，应隐藏 JTextArea 并且应减小对话框大小（小）
再次单击切换按钮时，应显示 JTextArea 并且应调整对话框的大小（大）

下面是我的切换按钮的 actionListener。我的代码只是删除了 JTextArea 但对话框的大小仍然很大

private void ShowOrHideLogToggleButtonItemStateChanged(final ItemEvent e) {
        final int state = e.getStateChange();
        if (state == ItemEvent.SELECTED) {
            ShowOrHideLogToggleButton.setText("Show Log");
            dialogPane.remove(contentPanel);
            dialogPane.updateUI();
            dialogPane.revalidate();
            dialogPane.repaint();

        } else {
            ShowOrHideLogToggleButton.setText("Hide Log");
            dialogPane.add(contentPanel);
            dialogPane.updateUI();
            dialogPane.revalidate();
            dialogPane.repaint();
            this.pack();
        }
    }

注意：ContentPanel 是包含 JTextArea 的 Jpanel，而 dialogPane 是包含 ContentPanel 的父 JPanel

最小、完整和可验证的示例（重现问题的代码）

package CollectionsPractice;

        import java.awt.BorderLayout;
        import java.awt.Container;
        import java.awt.Dialog;
        import java.awt.Dimension;
        import java.awt.Frame;
        import java.awt.GridBagConstraints;
        import java.awt.GridBagLayout;
        import java.awt.Insets;
        import java.awt.event.ActionEvent;
        import java.awt.event.ActionListener;

        import javax.swing.JButton;
        import javax.swing.JDialog;
        import javax.swing.JPanel;
        import javax.swing.JProgressBar;
        import javax.swing.JScrollPane;
        import javax.swing.JTextArea;
        import javax.swing.JToggleButton;
        import javax.swing.WindowConstants;
        import javax.swing.border.EmptyBorder;

/**
 * @author User #2
 */
public class Main
{
    public static void main(String[] args) {
        JDialog myDialog=new JDialog();
        new UpdateDialog(myDialog);
    }
}
 class UpdateDialog extends JDialog {


    public UpdateDialog(final JDialog owner) {
        super(owner);
        initComponents();
        resultTextPane.setText("Sample Text In Result Text Area");
    }

    private void ShowOrHideLogToggleButtonActionPerformed(final ActionEvent e) {
        final JToggleButton btn = (JToggleButton) e.getSource();
        if (btn.isSelected()) {
            btn.setText("Hide Myy Log");
            contentPanel.setVisible(true);
        } else {
            btn.setText("Show Myy Log");
            contentPanel.setVisible(false);
        }
    pack();
    }

    private void initComponents() {
        // JFormDesigner - Component initialization - DO NOT MODIFY  //GEN-BEGIN:initComponents
        dialogPane = new JPanel();
        contentPanel = new JPanel();
        scrollPane1 = new JScrollPane();
        resultTextPane = new JTextArea();
        buttonBar = new JPanel();
        progressBar = new JProgressBar();
        ShowOrHideLogToggleButton = new JToggleButton();
        logoutButton = new JButton();

        //======== this ========
        setTitle("Updater");
        setAlwaysOnTop(true);
        setDefaultCloseOperation(WindowConstants.DO_NOTHING_ON_CLOSE);
        setMinimumSize(new Dimension(1024, 800));
        setVisible(true);
        setName("this");
        final Container contentPane = getContentPane();
        contentPane.setLayout(new BorderLayout());

        //======== dialogPane ========
        {
            dialogPane.setBorder(new EmptyBorder(12, 12, 12, 12));
            dialogPane.setMinimumSize(new Dimension(640, 480));
            dialogPane.setName("dialogPane");
            dialogPane.setLayout(new BorderLayout());

            //======== contentPanel ========
            {
                contentPanel.setVisible(false);
                contentPanel.setName("contentPanel");
                contentPanel.setLayout(new BorderLayout());

                //======== scrollPane1 ========
                {
                    scrollPane1.setName("scrollPane1");

                    //---- resultTextPane ----
                    resultTextPane.setEditable(false);
                    resultTextPane.setName("resultTextPane");
                    scrollPane1.setViewportView(resultTextPane);
                }
                contentPanel.add(scrollPane1, BorderLayout.CENTER);
            }
            dialogPane.add(contentPanel, BorderLayout.CENTER);

            //======== buttonBar ========
            {
                buttonBar.setBorder(new EmptyBorder(12, 0, 0, 0));
                buttonBar.setName("buttonBar");
                buttonBar.setLayout(new GridBagLayout());
                ((GridBagLayout) buttonBar.getLayout()).columnWeights = new double[]{1.0, 0.0, 0.0};

                //---- progressBar ----
                progressBar.setStringPainted(true);
                progressBar.setName("progressBar");
                buttonBar.add(progressBar, new GridBagConstraints(0, 0, 1, 1, 0.0, 0.0, GridBagConstraints.CENTER, GridBagConstraints.BOTH,
                        new Insets(0, 0, 0, 5), 0, 0));

                //---- ShowOrHideLogToggleButton ----
                ShowOrHideLogToggleButton.setText("Show Log");
                ShowOrHideLogToggleButton.setName("ShowOrHideLogToggleButton");
                ShowOrHideLogToggleButton.addActionListener(new ActionListener() {
                    @Override
                    public void actionPerformed(final ActionEvent e) {
                        ShowOrHideLogToggleButtonActionPerformed(e);
                    }
                });
                buttonBar.add(ShowOrHideLogToggleButton, new GridBagConstraints(1, 0, 1, 1, 0.0, 0.0, GridBagConstraints.CENTER,
                        GridBagConstraints.BOTH, new Insets(0, 0, 0, 5), 0, 0));

                //---- logoutButton ----
                logoutButton.setText("Logout");
                logoutButton.setEnabled(false);
                logoutButton.setName("logoutButton");
                buttonBar.add(logoutButton, new GridBagConstraints(2, 0, 1, 1, 0.0, 0.0, GridBagConstraints.CENTER, GridBagConstraints.BOTH,
                        new Insets(0, 0, 0, 0), 0, 0));
            }
            dialogPane.add(buttonBar, BorderLayout.SOUTH);
        }
        contentPane.add(dialogPane, BorderLayout.CENTER);
        pack();
        setLocationRelativeTo(getOwner());
        // JFormDesigner - End of component initialization  //GEN-END:initComponents
    }

    // JFormDesigner - Variables declaration - DO NOT MODIFY  //GEN-BEGIN:variables
    private JPanel dialogPane;
    private JPanel contentPanel;
    private JScrollPane scrollPane1;
    private JTextArea resultTextPane;
    private JPanel buttonBar;
    private JProgressBar progressBar;
    private JToggleButton ShowOrHideLogToggleButton;
    private JButton logoutButton;
    // JFormDesigner - End of variables declaration  //GEN-END:variables
}

score 1 · Accepted Answer

首先，updateUI方法，大多数时候不需要调用它。repaint()和revalidate()适当容器中的方法是更好的做法。

其次，我不会采用添加/删除容器的方法（取决于您的容器 - JDialog 使用的组件数量和布局管理器）。我会采取可见/不可见的方法。

我制作了一个 SSCCE 以使其更加清晰。这正是我个人喜欢这些事情的方式。如果你想看看。代码中的一些额外注释。

此外，正如@Sergiy Medvynskyy 所提到的，适用于 JFrame 的东西也适用于 JDialog。

import java.awt.BorderLayout;
import java.awt.Dimension;

import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.JToggleButton;
import javax.swing.SwingUtilities;

public class TestFrame extends JFrame {
    private static final long serialVersionUID = 1965751967944243251L;

    public TestFrame() {
        super("A Frame");
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        getContentPane().setLayout(new BorderLayout());
        JToggleButton toggleButton = new JToggleButton("Show log");
        JTextArea textArea = new JTextArea();
        for (int i = 0; i < 144; i++) {
            textArea.append("This is the text area log!\n");
        }
        JPanel panelWithTextArea = new JPanel(new BorderLayout());
        JScrollPane sp = new JScrollPane(textArea);
        sp.setPreferredSize(new Dimension(sp.getPreferredSize().width, 300)); //Max height for textarea
        panelWithTextArea.add(sp);
        panelWithTextArea.setVisible(false); //Initially invisible
        //Add the item listener to toggleButton
        toggleButton.addItemListener(e -> {
            if (toggleButton.isSelected()) {
                panelWithTextArea.setVisible(true); //Make it visible
                toggleButton.setText("Hide Log");
            } else {
                panelWithTextArea.setVisible(false); //Back to invisible
                toggleButton.setText("Show Log");
            }
            pack(); //Repack the frame after component is visible
        });
        getContentPane().add(toggleButton, BorderLayout.PAGE_START);
        getContentPane().add(panelWithTextArea, BorderLayout.CENTER);
        setLocationRelativeTo(null);
        pack();

    }

    public static void main(String[] args) {
        SwingUtilities.invokeLater(() -> {
            TestFrame f = new TestFrame();
            f.setVisible(true);
        });
    }
}

小预览：

score 1 · Accepted Answer

你需要做的是重新包装你的窗户。这是我的例子：

import java.awt.BorderLayout;
import java.awt.Dimension;
import java.awt.FlowLayout;
import java.awt.Window;
import java.awt.event.ActionEvent;

import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.JToggleButton;
import javax.swing.SwingUtilities;
import javax.swing.WindowConstants;


public class WindowRepack implements Runnable {

    private static final String TEXT =
            "Lorem ipsum dolor sit amet, consetetur sadipscing elitr, sed diam nonumy eirmod "
                    + "tempor invidunt ut labore et dolore magna aliquyam erat, sed diam voluptua. "
                    + "At vero eos et accusam et justo duo dolores et ea rebum. Stet clita kasd "
                    + "gubergren, no sea takimata sanctus est Lorem ipsum dolor sit amet. Lorem "
                    + "ipsum dolor sit amet, consetetur sadipscing elitr, sed diam nonumy eirmod "
                    + "tempor invidunt ut labore et dolore magna aliquyam erat, sed diam voluptua. "
                    + "At vero eos et accusam et justo duo dolores et ea rebum. Stet clita kasd "
                    + "gubergren, no sea takimata sanctus est Lorem ipsum dolor sit amet.";

    private final JTextArea area = new JTextArea(5, 40);

    private final JScrollPane scroller = new JScrollPane(area);

    private final JPanel mainPanel = new JPanel(new BorderLayout());

    @Override
    public void run() {
        area.setText(TEXT);
        area.setLineWrap(true);
        area.setWrapStyleWord(true);
        JToggleButton tb = new JToggleButton("Show text");
        tb.addActionListener(this::updateUI);
        JPanel buttonsPanel = new JPanel(new FlowLayout(FlowLayout.TRAILING));
        buttonsPanel.add(tb);

        // provide fix width for the buttons panel to avoid horizontal scaling of window.
        Dimension defSize = buttonsPanel.getPreferredSize();
        // temporary make the scroll bar visible to compute the correct width
        scroller.setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_ALWAYS);
        buttonsPanel.setPreferredSize(new Dimension(scroller.getPreferredSize().width, defSize.height));
        scroller.setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_AS_NEEDED);
        // done

        mainPanel.add(buttonsPanel, BorderLayout.NORTH);
        JFrame frm = new JFrame("Dynamic frame");
        frm.add(mainPanel);
        frm.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
        frm.pack();
        frm.setLocationRelativeTo(null);
        frm.setVisible(true);
    }

    public static void main(String[] args) {
        SwingUtilities.invokeLater(new WindowRepack());
    }

    private void updateUI(ActionEvent evt) {
        JToggleButton btn = (JToggleButton) evt.getSource();
        if (btn.isSelected()) {
            btn.setText("Hide text");
            mainPanel.add(scroller);
        } else {
            btn.setText("Show text");
            mainPanel.remove(scroller);
        }
        Window w = SwingUtilities.windowForComponent(mainPanel);
        w.pack();
    }
}

我已经使用了JFrame，但同样的方法也适用于JDialog.

重要提示：只有当您使用正确的布局管理器来填充对话框时，这种方式才有效。

java - 在 JPanel 中添加或删除 JTextPane onclick of JToggle Button

2 回答 2

Related

Reference