将大量文本输入 JTextArea 时 JTextFields 和 JTextArea 缩小

【问题标题】：JTextFields and JTextArea shrinking when inputting large quantity of text into JTextArea将大量文本输入 JTextArea 时 JTextFields 和 JTextArea 缩小
【发布时间】：2016-04-22 09:31:42
【问题描述】：

我在JDialog 框中有一个JTabbedPane，它在窗格中包含的所有JPanels 上使用GridBagLayout。在显示的第一个面板上，有一个 JTextArea (descTxt) 可以在其中输入电影描述。当您在 JTextArea 中输入大量文本时，在您单击面板上的任何位置之前似乎都很好这不是一个组件（空白的灰色空间），然后所有文本字段和文本窗格都会缩小到看起来大小为 0 的大小。

这是一些要粘贴和测试的示例文本：

在载人火星任务期间，假定宇航员马克·沃特尼 在一场猛烈的风暴之后死亡，并被他的船员留下。但沃特尼有 幸存下来，发现自己被困在这个充满敌意的星球上。 由于物资匮乏，他必须发挥他的聪明才智、智慧和 生存的精神，并找到一种方法向地球发出他还活着的信号。

这是我的代码的可运行示例：

import java.awt.Color;
import java.awt.Dimension;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.Insets;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.File;
import java.util.ArrayList;
import java.util.regex.Pattern;
import javax.swing.BorderFactory;
import javax.swing.DefaultComboBoxModel;
import javax.swing.JButton;
import javax.swing.JComboBox;
import javax.swing.JDialog;
import javax.swing.JFileChooser;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTabbedPane;
import javax.swing.JTextArea;
import javax.swing.JTextField;
import javax.swing.ScrollPaneConstants;
import javax.swing.filechooser.FileNameExtensionFilter;

/**
 *
 * @author Chris
 */
public class AdminWindow extends JDialog implements ActionListener {

    private JPanel adminPanel1, adminPanel2, adminPanel3;
    private JTabbedPane tabPane;
    private GridBagConstraints g1, g2, g3;
    private JLabel idLbl, showLbl, descLbl, ageLbl, imgLbl, timeLbl, screenLbl,
            stanLbl, vipLbl, idLbl1, showLbl1, descLbl1, ageLbl1, imgLbl1, imgName;
    private JTextField idTxt, showTxt, imgTxt, timeTxt, stanTxt, vipTxt,
            idTxt1, showTxt1, imgTxt1;
    private JTextArea descTxt, descTxt1;
    private JComboBox ageCb, ageCb1, screenCb, timeCb, showingCb;
    private JScrollPane descTxtPane, descTxtPane1;
    private ArrayList<String> screenList, timeList, showingList;
    private DefaultComboBoxModel screenModel, timeModel, showingModel;
    private JButton submit, clear, seatSubmit, seatClear, addBtn, subBtn,
            submit1, clear1, imgBtn;
    private double stanPrice, vipPrice;
    private String stanPriceString, vipPriceString, priceExpression, imgString;
    private Pattern p;
    private File dest, chosenFile;

    public AdminWindow() {

        //frame properties
        super(new JFrame("Admin Panel"));
        setTitle("Admin Panel");
        //setSize(Dimensions.getScreenWidth() - 100, Dimensions.getScreenHeight() - 100);
        setAlwaysOnTop(true);
        setResizable(false);
        setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
        setLocationRelativeTo(null);

        //regular expression validations
        priceExpression = "[0-9]{1,2}[.]{1}[0-9]{2}";
        p = Pattern.compile(priceExpression);

        //panel dec
        tabPane = new JTabbedPane();
        adminPanel1 = new JPanel();
        adminPanel2 = new JPanel();
        adminPanel3 = new JPanel();
        g1 = new GridBagConstraints();
        g2 = new GridBagConstraints();
        g3 = new GridBagConstraints();

        //label dec
        idLbl = new JLabel("Film ID");
        showLbl = new JLabel("Film Name");
        descLbl = new JLabel("Film Description");
        ageLbl = new JLabel("Age Rating");
        imgLbl = new JLabel("Image");
        idLbl1 = new JLabel("Film ID");
        showLbl1 = new JLabel("Film Name");
        descLbl1 = new JLabel("Film Description");
        ageLbl1 = new JLabel("Age Rating");
        imgLbl1 = new JLabel("Image");
        timeLbl = new JLabel("Showing Times");
        screenLbl = new JLabel("Screen Number");
        stanLbl = new JLabel("Standard Ticket Cost (£)");
        vipLbl = new JLabel("VIP Ticket Cost (£)");
        imgName = new JLabel("filename.jpg");

        //label properties
        imgName.setPreferredSize(new Dimension(100, 20));

        //txttfield dec
        idTxt = new JTextField(4);
        showTxt = new JTextField(30);
        descTxt = new JTextArea(4, 30);
        descTxtPane = new JScrollPane(descTxt, ScrollPaneConstants.VERTICAL_SCROLLBAR_AS_NEEDED, ScrollPaneConstants.HORIZONTAL_SCROLLBAR_NEVER);
        imgTxt = new JTextField();
        idTxt1 = new JTextField(4);
        showTxt1 = new JTextField(30);
        descTxt1 = new JTextArea(4, 30);
        descTxtPane1 = new JScrollPane(descTxt1, ScrollPaneConstants.VERTICAL_SCROLLBAR_AS_NEEDED, ScrollPaneConstants.HORIZONTAL_SCROLLBAR_NEVER);
        imgTxt1 = new JTextField();
        timeTxt = new JTextField(4);
        stanTxt = new JTextField(4);
        vipTxt = new JTextField(4);

        //textfield properties
        idTxt1.setEditable(false);
        descTxt.setWrapStyleWord(true);
        descTxt.setLineWrap(true);

        //drop-down dec
        ageCb = new JComboBox();
        ageCb1 = new JComboBox();
        screenCb = new JComboBox();
        timeCb = new JComboBox();
        showingCb = new JComboBox();

        //dropdown properties
        timeCb.setPreferredSize(new Dimension(60, 23));

        //buttons
        submit = new JButton("Submit");
        clear = new JButton("Clear");
        submit1 = new JButton("Submit");
        clear1 = new JButton("Clear");
        seatSubmit = new JButton("Submit");
        seatClear = new JButton("Show Current");
        addBtn = new JButton("+");
        subBtn = new JButton("-");
        imgBtn = new JButton("Browse..");

        //button properties
        addBtn.setFocusPainted(false);
        subBtn.setFocusPainted(false);
        addBtn.setMargin(new Insets(0, 5, 0, 5));
        subBtn.setMargin(new Insets(0, 5, 0, 5));

        //listeners
        submit.addActionListener(this);
        clear.addActionListener(this);
        seatSubmit.addActionListener(this);
        seatClear.addActionListener(this);
        addBtn.addActionListener(this);
        subBtn.addActionListener(this);
        imgBtn.addActionListener(this);


        //fill price text fields with existing prices
        defaultForm();

        //add items to jcombobox
        ageCb.addItem("U");
        ageCb.addItem("12A");
        ageCb.addItem("15");
        ageCb.addItem("18");
        ageCb1.addItem("U");
        ageCb1.addItem("12A");
        ageCb1.addItem("15");
        ageCb1.addItem("18");

        //panel properties

        adminPanel1.setLayout(new GridBagLayout());
        adminPanel2.setLayout(new GridBagLayout());
        adminPanel3.setLayout(new GridBagLayout());
        adminPanel1.setBorder(BorderFactory.createTitledBorder(BorderFactory.createLineBorder(Color.black), "New Showing"));
        adminPanel2.setBorder(BorderFactory.createTitledBorder(BorderFactory.createLineBorder(Color.black), "Seat Prices"));
        adminPanel3.setBorder(BorderFactory.createTitledBorder(BorderFactory.createLineBorder(Color.black), "Edit Showing"));

        //ading panels to tabbed pane
        tabPane.addTab("Add Showings", null, adminPanel1, "Add new showings & showing times");
        tabPane.addTab("Seat Prices", null, adminPanel2, "Change seat prices");
        tabPane.addTab("Edit Showing", null, adminPanel3, "Edit existing showing");

        //-----adding components to pane--------------------------------------!
        g1.gridx = 0;
        g1.gridy = 0;
        g1.insets = new Insets(10, 0, 0, 10);
        g1.anchor = GridBagConstraints.LINE_END;
        adminPanel1.add(idLbl, g1);
        g1.gridx++;
        g1.anchor = GridBagConstraints.LINE_START;
        adminPanel1.add(idTxt, g1);
        g1.gridy++;
        g1.gridx--;
        g1.anchor = GridBagConstraints.LINE_END;
        adminPanel1.add(showLbl, g1);
        g1.gridx++;
        g1.anchor = GridBagConstraints.LINE_START;
        g1.gridwidth = 4;
        adminPanel1.add(showTxt, g1);
        g1.gridwidth = 1;
        g1.gridy++;
        g1.gridx--;
        g1.anchor = GridBagConstraints.LINE_END;
        adminPanel1.add(descLbl, g1);
        g1.gridx++;
        g1.anchor = GridBagConstraints.LINE_START;
        g1.gridwidth = 4;
        adminPanel1.add(descTxtPane, g1);
        g1.gridwidth = 1;
        g1.gridy++;
        g1.gridx--;
        g1.anchor = GridBagConstraints.LINE_END;
        adminPanel1.add(ageLbl, g1);
        g1.gridx++;
        g1.anchor = GridBagConstraints.LINE_START;
        adminPanel1.add(ageCb, g1);
        g1.gridy++;
        g1.gridx--;
        g1.anchor = GridBagConstraints.LINE_END;
        adminPanel1.add(imgLbl, g1);
        g1.gridx++;
        g1.anchor = GridBagConstraints.LINE_START;
        g1.gridwidth = 2;
        adminPanel1.add(imgBtn, g1);
        g1.gridx = 3;
        adminPanel1.add(imgName, g1);
        g1.gridwidth = 1;
        g1.gridy++;
        g1.gridx = 0;
        g1.anchor = GridBagConstraints.LINE_END;
        adminPanel1.add(screenLbl, g1);
        g1.gridx++;
        g1.anchor = GridBagConstraints.LINE_START;
        adminPanel1.add(screenCb, g1);
        g1.gridx--;
        g1.gridy++;
        g1.anchor = GridBagConstraints.LINE_END;
        adminPanel1.add(timeLbl, g1);
        g1.gridx++;
        g1.anchor = GridBagConstraints.LINE_START;
        adminPanel1.add(timeTxt, g1);
        g1.gridx++;
        adminPanel1.add(addBtn, g1);
        g1.gridx++;
        adminPanel1.add(timeCb, g1);
        g1.gridx++;
        adminPanel1.add(subBtn, g1);
        //buttons
        g1.gridy++;
        g1.gridx = 0;
        g1.insets = new Insets(10, 0, 10, 10); //top, right, bottom, left
        g1.anchor = GridBagConstraints.LINE_END;
        adminPanel1.add(clear, g1);
        g1.gridx++;
        g1.anchor = GridBagConstraints.LINE_START;
        g1.gridwidth = 4;
        adminPanel1.add(submit, g1);
        g1.gridwidth = 1;

        //------adding components to panel2-----------------------------------!
        //left
        g2.gridx = 0;
        g2.gridy = 0;
        g2.insets = new Insets(10, 10, 0, 10);
        g2.anchor = GridBagConstraints.LINE_END;
        adminPanel2.add(stanLbl, g2);
        g2.gridy++;
        adminPanel2.add(vipLbl, g2);
        g2.gridy++;
        adminPanel2.add(seatClear, g2);
        //right
        g2.gridy = 0;
        g2.gridx++;
        g2.anchor = GridBagConstraints.LINE_START;
        adminPanel2.add(stanTxt, g2);
        g2.gridy++;
        adminPanel2.add(vipTxt, g2);
        g2.gridy++;
        adminPanel2.add(seatSubmit, g2);

        //-----adminpanel3-----------------------------------------------------
        //adding components to panel1
        g3.gridx = 1;
        g3.gridy = 0;
        g3.insets = new Insets(10, 0, 0, 10);
        g3.anchor = GridBagConstraints.LINE_START;
        g3.gridwidth = 4;
        adminPanel3.add(showingCb, g3);
        g3.gridwidth = 1;
        g3.gridx--;
        g3.gridy++;
        g3.anchor = GridBagConstraints.LINE_END;
        adminPanel3.add(idLbl1, g3);
        g3.gridx++;
        g3.anchor = GridBagConstraints.LINE_START;
        adminPanel3.add(idTxt1, g3);
        g3.gridy++;
        g3.gridx--;
        g3.anchor = GridBagConstraints.LINE_END;
        adminPanel3.add(showLbl1, g3);
        g3.gridx++;
        g3.anchor = GridBagConstraints.LINE_START;
        g3.gridwidth = 5;
        adminPanel3.add(showTxt1, g3);
        g3.gridwidth = 1;
        g3.gridy++;
        g3.gridx--;
        g3.anchor = GridBagConstraints.LINE_END;
        adminPanel3.add(descLbl1, g3);
        g3.gridx++;
        g3.anchor = GridBagConstraints.LINE_START;
        g3.gridwidth = 4;
        adminPanel3.add(descTxtPane1, g3);
        g3.gridwidth = 1;
        g3.gridy++;
        g3.gridx--;
        g3.anchor = GridBagConstraints.LINE_END;
        adminPanel3.add(ageLbl1, g3);
        g3.gridx++;
        g3.anchor = GridBagConstraints.LINE_START;
        adminPanel3.add(ageCb1, g3);
        g3.gridy++;
        g3.gridx--;

        //buttons
        g3.gridy++;
        g3.gridx = 0;
        g3.insets = new Insets(10, 0, 10, 10); //top, right, bottom, left
        g3.anchor = GridBagConstraints.LINE_END;
        adminPanel3.add(clear1, g3);
        g3.gridx++;
        g3.anchor = GridBagConstraints.LINE_START;
        g3.gridwidth = 4;
        adminPanel3.add(submit1, g3);
        g3.gridwidth = 1;

        //adding tabbed pane to frame
        this.add(tabPane);
        this.pack();

        //visibility
        setVisible(true);
        tabPane.setVisible(true);

        //actionlisteners
    }

    public static void main(String[] args) {
        AdminWindow test = new AdminWindow();
    }

    @Override
    public void actionPerformed(ActionEvent e) {

        if (e.getSource() == imgBtn) {

            //--JFileChooser, ugly but better to use--
            String userDir = System.getProperty("user.home");
            JFileChooser chooser = new JFileChooser(userDir+"/Desktop");
            int choice = chooser.showDialog(this, "Choose");
            if (choice != JFileChooser.APPROVE_OPTION) {
                return;
            }

            FileNameExtensionFilter filter = new FileNameExtensionFilter("Image Files", "jpg", "png", "gif", "jpeg");
            chooser.setAcceptAllFileFilterUsed(false);
            chooser.addChoosableFileFilter(filter);
            chosenFile = chooser.getSelectedFile();
            imgName.setText(chosenFile.getName());
            dest = new File(System.getProperty("user.dir") + "/src/iegroup/resources", chosenFile.getName());
            imgString = "resources/" + chosenFile.getName();
            System.out.println(dest.toPath());
        }

        if (e.getSource() == submit) {


        if (e.getSource() == clear ){


        }

        if (e.getSource() == seatSubmit) {

            }
        }
        if (e.getSource() == seatClear) {
            defaultForm();
        }

        if (e.getSource() == addBtn) {

            timeModel.addElement(timeTxt.getText());
            timeList.add(timeTxt.getText());
        }
        if (e.getSource() == subBtn) {
            timeModel.removeElement(timeCb.getSelectedItem());
            timeList.remove(timeCb.getSelectedItem());
        }
    }

    private void defaultForm() {

        stanPriceString = String.format("%.2f", stanPrice);
        vipPriceString = String.format("%.2f", vipPrice);
        stanTxt.setText(stanPriceString);
        vipTxt.setText(vipPriceString);
    }

    public void showValidationPrompt(String message) {
        JFrame validFrame = new JFrame();
        validFrame.setAlwaysOnTop(true);
        JOptionPane.showMessageDialog(validFrame, message, "Invalid input", JOptionPane.CLOSED_OPTION);

    }

    public void showSuccessPrompt(String message) {
        JFrame errorFrame = new JFrame();
        errorFrame.setAlwaysOnTop(true);
        JOptionPane.showMessageDialog(errorFrame, message, "Success", JOptionPane.CLOSED_OPTION);

    }
}

请帮忙。这个非常令人困惑，我似乎无法在任何地方找到解决方案。

【问题讨论】：

    标签： java swing jtextarea shrink


    【解决方案1】：

    所以，问题似乎是setResizable(false) 和ScrollPaneConstants.VERTICAL_SCROLLBAR_AS_NEEDED 的组合（好吧，我只是讨厌无法调整大小的窗口）。

    发生的情况是，当您填写JTextArea 时，它会将JScrollPane“添加”到已经“打包”的窗口中，因此组件的大小发生了变化，然后当容器被重新验证时，不再足够剩余空间以将所有字段打包成首选大小，因此它们的大小被调整为最小大小，通常为0x0 或足够接近。

    您可以做一些事情来帮助解决问题。您可以使用GridBagConstraints#fill 并使用GridBagConstraints.HORIZONTAL 用于文本字段，GridBagConstraints.BOTH 用于文本区域，这将允许字段“填充”并占用列/行的可用空间，无论何时单元格空间小于组件的首选大小。

    您可能还会发现 GridBagConstraints#weightx/y 到 1 可以提供帮助。

    如果你真的遇到麻烦，你可以简单地在JScrollPane 中使用ScrollPaneConstants.VERTICAL_SCROLLBAR_ALWAYS，虽然不是很漂亮，但会在窗口被打包时将JScrollBar 大小添加到JScrollPane 中

    更新

    所以，基本上，我最终将fill 和weightx/y 组合用于JScrollPane 和JTextAreas

    g1.fill = GridBagConstraints.BOTH;
g1.weightx = 1;
g1.weighty = 1;
adminPanel1.add(descTxtPane, g1);
g1.fill = GridBagConstraints.NONE;
g1.weightx = 0;
g1.weighty = 0;

    对于JTextFields，我刚刚使用了fill，这似乎使事情稳定了...

    g1.fill = GridBagConstraints.HORIZONTAL;
adminPanel1.add(idTxt, g1);
g1.fill = GridBagConstraints.NONE;

    这导致了类似...

    import java.awt.Color;
import java.awt.Dimension;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.Insets;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.File;
import java.util.ArrayList;
import java.util.regex.Pattern;
import javax.swing.BorderFactory;
import javax.swing.DefaultComboBoxModel;
import javax.swing.JButton;
import javax.swing.JComboBox;
import javax.swing.JDialog;
import javax.swing.JFileChooser;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTabbedPane;
import javax.swing.JTextArea;
import javax.swing.JTextField;
import javax.swing.ScrollPaneConstants;
import javax.swing.filechooser.FileNameExtensionFilter;

public class AdminWindow extends JDialog implements ActionListener {

    private JPanel adminPanel1, adminPanel2, adminPanel3;
    private JTabbedPane tabPane;
    private GridBagConstraints g1, g2, g3;
    private JLabel idLbl, showLbl, descLbl, ageLbl, imgLbl, timeLbl, screenLbl,
            stanLbl, vipLbl, idLbl1, showLbl1, descLbl1, ageLbl1, imgLbl1, imgName;
    private JTextField idTxt, showTxt, imgTxt, timeTxt, stanTxt, vipTxt,
            idTxt1, showTxt1, imgTxt1;
    private JTextArea descTxt, descTxt1;
    private JComboBox ageCb, ageCb1, screenCb, timeCb, showingCb;
    private JScrollPane descTxtPane, descTxtPane1;
    private ArrayList<String> screenList, timeList, showingList;
    private DefaultComboBoxModel screenModel, timeModel, showingModel;
    private JButton submit, clear, seatSubmit, seatClear, addBtn, subBtn,
            submit1, clear1, imgBtn;
    private double stanPrice, vipPrice;
    private String stanPriceString, vipPriceString, priceExpression, imgString;
    private Pattern p;
    private File dest, chosenFile;

    public AdminWindow() {

        //frame properties
        setTitle("Admin Panel");
        //setSize(Dimensions.getScreenWidth() - 100, Dimensions.getScreenHeight() - 100);
        setAlwaysOnTop(true);
//        setResizable(false);
        setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
        setLocationRelativeTo(null);

        //regular expression validations
        priceExpression = "[0-9]{1,2}[.]{1}[0-9]{2}";
        p = Pattern.compile(priceExpression);

        //panel dec
        tabPane = new JTabbedPane();
        adminPanel1 = new JPanel();
        adminPanel2 = new JPanel();
        adminPanel3 = new JPanel();
        g1 = new GridBagConstraints();
        g2 = new GridBagConstraints();
        g3 = new GridBagConstraints();

        //label dec
        idLbl = new JLabel("Film ID");
        showLbl = new JLabel("Film Name");
        descLbl = new JLabel("Film Description");
        ageLbl = new JLabel("Age Rating");
        imgLbl = new JLabel("Image");
        idLbl1 = new JLabel("Film ID");
        showLbl1 = new JLabel("Film Name");
        descLbl1 = new JLabel("Film Description");
        ageLbl1 = new JLabel("Age Rating");
        imgLbl1 = new JLabel("Image");
        timeLbl = new JLabel("Showing Times");
        screenLbl = new JLabel("Screen Number");
        stanLbl = new JLabel("Standard Ticket Cost (£)");
        vipLbl = new JLabel("VIP Ticket Cost (£)");
        imgName = new JLabel("filename.jpg");

        //label properties
//        imgName.setPreferredSize(new Dimension(100, 20));

        //txttfield dec
        idTxt = new JTextField(4);
        showTxt = new JTextField(30);
        descTxt = new JTextArea(4, 30);
        descTxtPane = new JScrollPane(descTxt, ScrollPaneConstants.VERTICAL_SCROLLBAR_AS_NEEDED, ScrollPaneConstants.HORIZONTAL_SCROLLBAR_NEVER);
        imgTxt = new JTextField();
        idTxt1 = new JTextField(4);
        showTxt1 = new JTextField(30);
        descTxt1 = new JTextArea(4, 30);
        descTxtPane1 = new JScrollPane(descTxt1, ScrollPaneConstants.VERTICAL_SCROLLBAR_AS_NEEDED, ScrollPaneConstants.HORIZONTAL_SCROLLBAR_NEVER);
        imgTxt1 = new JTextField();
        timeTxt = new JTextField(4);
        stanTxt = new JTextField(4);
        vipTxt = new JTextField(4);

        //textfield properties
        idTxt1.setEditable(false);
        descTxt.setWrapStyleWord(true);
        descTxt.setLineWrap(true);

        //drop-down dec
        ageCb = new JComboBox();
        ageCb1 = new JComboBox();
        screenCb = new JComboBox();
        timeCb = new JComboBox();
        showingCb = new JComboBox();

        //dropdown properties
//        timeCb.setPreferredSize(new Dimension(60, 23));

        //buttons
        submit = new JButton("Submit");
        clear = new JButton("Clear");
        submit1 = new JButton("Submit");
        clear1 = new JButton("Clear");
        seatSubmit = new JButton("Submit");
        seatClear = new JButton("Show Current");
        addBtn = new JButton("+");
        subBtn = new JButton("-");
        imgBtn = new JButton("Browse..");

        //button properties
        addBtn.setFocusPainted(false);
        subBtn.setFocusPainted(false);
        addBtn.setMargin(new Insets(0, 5, 0, 5));
        subBtn.setMargin(new Insets(0, 5, 0, 5));

        //listeners
        submit.addActionListener(this);
        clear.addActionListener(this);
        seatSubmit.addActionListener(this);
        seatClear.addActionListener(this);
        addBtn.addActionListener(this);
        subBtn.addActionListener(this);
        imgBtn.addActionListener(this);

        //fill price text fields with existing prices
        defaultForm();

        //add items to jcombobox
        ageCb.addItem("U");
        ageCb.addItem("12A");
        ageCb.addItem("15");
        ageCb.addItem("18");
        ageCb1.addItem("U");
        ageCb1.addItem("12A");
        ageCb1.addItem("15");
        ageCb1.addItem("18");

        //panel properties
        adminPanel1.setLayout(new GridBagLayout());
        adminPanel2.setLayout(new GridBagLayout());
        adminPanel3.setLayout(new GridBagLayout());
        adminPanel1.setBorder(BorderFactory.createTitledBorder(BorderFactory.createLineBorder(Color.black), "New Showing"));
        adminPanel2.setBorder(BorderFactory.createTitledBorder(BorderFactory.createLineBorder(Color.black), "Seat Prices"));
        adminPanel3.setBorder(BorderFactory.createTitledBorder(BorderFactory.createLineBorder(Color.black), "Edit Showing"));

        //ading panels to tabbed pane
        tabPane.addTab("Add Showings", null, adminPanel1, "Add new showings & showing times");
        tabPane.addTab("Seat Prices", null, adminPanel2, "Change seat prices");
        tabPane.addTab("Edit Showing", null, adminPanel3, "Edit existing showing");

        //-----adding components to pane--------------------------------------!
        g1.gridx = 0;
        g1.gridy = 0;
        g1.insets = new Insets(10, 0, 0, 10);
        g1.anchor = GridBagConstraints.LINE_END;
        adminPanel1.add(idLbl, g1);
        g1.gridx++;
        g1.anchor = GridBagConstraints.LINE_START;
    g1.fill = GridBagConstraints.HORIZONTAL;
    adminPanel1.add(idTxt, g1);
    g1.fill = GridBagConstraints.NONE;
        g1.gridy++;
        g1.gridx--;
        g1.anchor = GridBagConstraints.LINE_END;
        adminPanel1.add(showLbl, g1);
        g1.gridx++;
        g1.anchor = GridBagConstraints.LINE_START;
        g1.gridwidth = 4;
        g1.fill = GridBagConstraints.HORIZONTAL;
        adminPanel1.add(showTxt, g1);
        g1.fill = GridBagConstraints.NONE;
        g1.gridwidth = 1;
        g1.gridy++;
        g1.gridx--;
        g1.anchor = GridBagConstraints.LINE_END;
        adminPanel1.add(descLbl, g1);
        g1.gridx++;
        g1.anchor = GridBagConstraints.LINE_START;
        g1.gridwidth = 4;
        g1.fill = GridBagConstraints.BOTH;
        g1.weightx = 1;
        g1.weighty = 1;
        adminPanel1.add(descTxtPane, g1);
        g1.fill = GridBagConstraints.NONE;
        g1.weightx = 0;
        g1.weighty = 0;
        g1.gridwidth = 1;
        g1.gridy++;
        g1.gridx--;
        g1.anchor = GridBagConstraints.LINE_END;
        adminPanel1.add(ageLbl, g1);
        g1.gridx++;
        g1.anchor = GridBagConstraints.LINE_START;
        adminPanel1.add(ageCb, g1);
        g1.gridy++;
        g1.gridx--;
        g1.anchor = GridBagConstraints.LINE_END;
        adminPanel1.add(imgLbl, g1);
        g1.gridx++;
        g1.anchor = GridBagConstraints.LINE_START;
        g1.gridwidth = 2;
        adminPanel1.add(imgBtn, g1);
        g1.gridx = 3;
        adminPanel1.add(imgName, g1);
        g1.gridwidth = 1;
        g1.gridy++;
        g1.gridx = 0;
        g1.anchor = GridBagConstraints.LINE_END;
        adminPanel1.add(screenLbl, g1);
        g1.gridx++;
        g1.anchor = GridBagConstraints.LINE_START;
        adminPanel1.add(screenCb, g1);
        g1.gridx--;
        g1.gridy++;
        g1.anchor = GridBagConstraints.LINE_END;
        adminPanel1.add(timeLbl, g1);
        g1.gridx++;
        g1.anchor = GridBagConstraints.LINE_START;
        g1.fill = GridBagConstraints.HORIZONTAL;
        adminPanel1.add(timeTxt, g1);
        g1.fill = GridBagConstraints.NONE;
        g1.gridx++;
        adminPanel1.add(addBtn, g1);
        g1.gridx++;
        adminPanel1.add(timeCb, g1);
        g1.gridx++;
        adminPanel1.add(subBtn, g1);
        //buttons
        g1.gridy++;
        g1.gridx = 0;
        g1.insets = new Insets(10, 0, 10, 10); //top, right, bottom, left
        g1.anchor = GridBagConstraints.LINE_END;
        adminPanel1.add(clear, g1);
        g1.gridx++;
        g1.anchor = GridBagConstraints.LINE_START;
        g1.gridwidth = 4;
        adminPanel1.add(submit, g1);
        g1.gridwidth = 1;

        //------adding components to panel2-----------------------------------!
        //left
        g2.gridx = 0;
        g2.gridy = 0;
        g2.insets = new Insets(10, 10, 0, 10);
        g2.anchor = GridBagConstraints.LINE_END;
        adminPanel2.add(stanLbl, g2);
        g2.gridy++;
        adminPanel2.add(vipLbl, g2);
        g2.gridy++;
        adminPanel2.add(seatClear, g2);
        //right
        g2.gridy = 0;
        g2.gridx++;
        g2.anchor = GridBagConstraints.LINE_START;
        g2.fill = GridBagConstraints.HORIZONTAL;
        adminPanel2.add(stanTxt, g2);
        g2.fill = GridBagConstraints.NONE;
        g2.gridy++;
        g2.fill = GridBagConstraints.HORIZONTAL;
        adminPanel2.add(vipTxt, g2);
        g2.fill = GridBagConstraints.NONE;
        g2.gridy++;
        adminPanel2.add(seatSubmit, g2);

        //-----adminpanel3-----------------------------------------------------
        //adding components to panel1
        g3.gridx = 1;
        g3.gridy = 0;
        g3.insets = new Insets(10, 0, 0, 10);
        g3.anchor = GridBagConstraints.LINE_START;
        g3.gridwidth = 4;
        adminPanel3.add(showingCb, g3);
        g3.gridwidth = 1;
        g3.gridx--;
        g3.gridy++;
        g3.anchor = GridBagConstraints.LINE_END;
        adminPanel3.add(idLbl1, g3);
        g3.gridx++;
        g3.anchor = GridBagConstraints.LINE_START;
        g3.fill = GridBagConstraints.HORIZONTAL;
        adminPanel3.add(idTxt1, g3);
        g3.fill = GridBagConstraints.NONE;
        g3.gridy++;
        g3.gridx--;
        g3.anchor = GridBagConstraints.LINE_END;
        adminPanel3.add(showLbl1, g3);
        g3.gridx++;
        g3.anchor = GridBagConstraints.LINE_START;
        g3.gridwidth = 5;
        g3.fill = GridBagConstraints.HORIZONTAL;
        adminPanel3.add(showTxt1, g3);
        g3.fill = GridBagConstraints.NONE;
        g3.gridwidth = 1;
        g3.gridy++;
        g3.gridx--;
        g3.anchor = GridBagConstraints.LINE_END;
        adminPanel3.add(descLbl1, g3);
        g3.gridx++;
        g3.anchor = GridBagConstraints.LINE_START;
        g3.gridwidth = 4;
        g3.fill = GridBagConstraints.BOTH;
        g3.weightx = 1;
        g3.weighty = 1;
        adminPanel3.add(descTxtPane1, g3);
        g3.fill = GridBagConstraints.NONE;
        g3.weightx = 0;
        g3.weighty = 0;
        g3.gridwidth = 1;
        g3.gridy++;
        g3.gridx--;
        g3.anchor = GridBagConstraints.LINE_END;
        adminPanel3.add(ageLbl1, g3);
        g3.gridx++;
        g3.anchor = GridBagConstraints.LINE_START;
        adminPanel3.add(ageCb1, g3);
        g3.gridy++;
        g3.gridx--;

        //buttons
        g3.gridy++;
        g3.gridx = 0;
        g3.insets = new Insets(10, 0, 10, 10); //top, right, bottom, left
        g3.anchor = GridBagConstraints.LINE_END;
        adminPanel3.add(clear1, g3);
        g3.gridx++;
        g3.anchor = GridBagConstraints.LINE_START;
        g3.gridwidth = 4;
        adminPanel3.add(submit1, g3);
        g3.gridwidth = 1;

        //adding tabbed pane to frame
        this.add(tabPane);
        this.pack();

        //visibility
        setVisible(true);
        tabPane.setVisible(true);

        //actionlisteners
    }

    public static void main(String[] args) {
        AdminWindow test = new AdminWindow();
    }

    @Override
    public void actionPerformed(ActionEvent e) {

        if (e.getSource() == imgBtn) {

            //--JFileChooser, ugly but better to use--
            String userDir = System.getProperty("user.home");
            JFileChooser chooser = new JFileChooser(userDir + "/Desktop");
            int choice = chooser.showDialog(this, "Choose");
            if (choice != JFileChooser.APPROVE_OPTION) {
                return;
            }

            FileNameExtensionFilter filter = new FileNameExtensionFilter("Image Files", "jpg", "png", "gif", "jpeg");
            chooser.setAcceptAllFileFilterUsed(false);
            chooser.addChoosableFileFilter(filter);
            chosenFile = chooser.getSelectedFile();
            imgName.setText(chosenFile.getName());
            dest = new File(System.getProperty("user.dir") + "/src/iegroup/resources", chosenFile.getName());
            imgString = "resources/" + chosenFile.getName();
            System.out.println(dest.toPath());
        }

        if (e.getSource() == submit) {

            if (e.getSource() == clear) {

            }

            if (e.getSource() == seatSubmit) {

            }
        }
        if (e.getSource() == seatClear) {
            defaultForm();
        }

        if (e.getSource() == addBtn) {

            timeModel.addElement(timeTxt.getText());
            timeList.add(timeTxt.getText());
        }
        if (e.getSource() == subBtn) {
            timeModel.removeElement(timeCb.getSelectedItem());
            timeList.remove(timeCb.getSelectedItem());
        }
    }

    private void defaultForm() {

        stanPriceString = String.format("%.2f", stanPrice);
        vipPriceString = String.format("%.2f", vipPrice);
        stanTxt.setText(stanPriceString);
        vipTxt.setText(vipPriceString);
    }

    public void showValidationPrompt(String message) {
        JFrame validFrame = new JFrame();
        validFrame.setAlwaysOnTop(true);
        JOptionPane.showMessageDialog(validFrame, message, "Invalid input", JOptionPane.CLOSED_OPTION);

    }

    public void showSuccessPrompt(String message) {
        JFrame errorFrame = new JFrame();
        errorFrame.setAlwaysOnTop(true);
        JOptionPane.showMessageDialog(errorFrame, message, "Success", JOptionPane.CLOSED_OPTION);

    }
}

    【讨论】：

    • 我尝试摆弄 GridBagConstraints#fill 和 weighty/x 但无法让它正常工作。我一直使用垂直滚动条，因为它为我提供了快速修复，但就像你说的那样不是最漂亮的。打算把这个打开一段时间，看看是否有人可以解决它，如果没有，我会接受这个作为答案。谢谢。
    • 我终于有机会进一步尝试并使用fill和weightx/y的组合来稳定UI，看看你的想法
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