Java 从自定义JDialog输出数据或结果更新JFrame中的JTextArea文本

我在主布局中有一个

JTextArea

，我想使用自定义

JDialog

更新它。很难用这样的话来解释…所以请按照下面概述的代码和解释过程进行操作：

我有一个JPanel，其中包含需要更新的JTextArea（即原始JTextArea—“cancellationPolicTA”）：

public class Panel_Other_Information extends JPanel {

private JTextArea cancellationPolicyTA, otherInformationTA;
public final String cancellationPolicyBorderTXT = " Cancellation Policy ";
public final String additionalInformationBorderTXT = " Other Information ";

public Panel_Other_Information () {

    // Create and set up the window.
    JPanel thisPanel = new JPanel ();

    // [1] Define the Dimensions of the Panel.
    Dimension panelSize = getPreferredSize();
    panelSize.width = 520;
    panelSize.height = 100;
    setPreferredSize(panelSize);
    setBorder(BorderFactory.createTitledBorder(" 15. Additional Information "));

    // [2] Use the 'SpringLayout' to set or define the layout of components within this panel.
    SpringLayout layout = new SpringLayout();
    setLayout(layout);
    setBackground(McGyver.APP_THEME_COLOR);

    // [3] Define required Label components/controls.
    JLabel cancellationPolicyLabel = new JLabel ("Cancellation Policy:");
    JLabel otherInformationLabel = new JLabel ("Other Information:");
    String canPolTxt = "No Cancellation Policy";
    String othInfTxt = "No Additional Information";

    // [4] Define required input (TextField) controls/components.
    final int widthCB = 230;
    final int heightCB = 48;
    cancellationPolicyTA = new JTextArea(canPolTxt);
    cancellationPolicyTA.setEditable(false);
    cancellationPolicyTA.setWrapStyleWord(true);
    cancellationPolicyTA.addMouseListener(new CancelPolicyMouseListener());
    cancellationPolicyTA.addFocusListener(new CancelPolicyFocusListener());

    otherInformationTA = new JTextArea(othInfTxt);
    otherInformationTA.setEditable(false);
    otherInformationTA.setWrapStyleWord(true);
    otherInformationTA.addMouseListener(new OtherInformationMouseListener());

    JScrollPane canPolTAScrollPane = new JScrollPane(cancellationPolicyTA);
    canPolTAScrollPane.setPreferredSize(new Dimension(widthCB, heightCB));
    JScrollPane otherInfoTAScrollPane = new JScrollPane(otherInformationTA);
    otherInfoTAScrollPane.setPreferredSize(new Dimension(widthCB, heightCB));

    // [5] Define button controls - if needed.
    /* JButton saveDataBTN = new JButton("Save"); */

    ////////////////////////////////////////////////////////////////////////
    //      Define the layout of components - component-by-component      //
    ////////////////////////////////////////////////////////////////////////

    /* -- Component 1 - Additional Information - Cancellation Policy Label */
    layout.putConstraint(SpringLayout.NORTH, cancellationPolicyLabel, 5, SpringLayout.NORTH, thisPanel);
    layout.putConstraint(SpringLayout.WEST, cancellationPolicyLabel, 0, SpringLayout.EAST, thisPanel);

    /* -- Component 2 - Additional Information - Cancellation Policy Text Area */
    layout.putConstraint(SpringLayout.NORTH, canPolTAScrollPane, 5, SpringLayout.SOUTH, cancellationPolicyLabel);
    layout.putConstraint(SpringLayout.WEST, canPolTAScrollPane, 0, SpringLayout.WEST, cancellationPolicyLabel);

    /* -- Component 1 - Additional Information - Cancellation Policy Label */
    layout.putConstraint(SpringLayout.NORTH, otherInformationLabel, 5, SpringLayout.NORTH, thisPanel);
    layout.putConstraint(SpringLayout.WEST, otherInformationLabel, 30, SpringLayout.EAST, canPolTAScrollPane);

    /* -- Component 2 - Additional Information - Cancellation Policy Text Area */
    layout.putConstraint(SpringLayout.NORTH, otherInfoTAScrollPane, 5, SpringLayout.SOUTH, otherInformationLabel);
    layout.putConstraint(SpringLayout.WEST, otherInfoTAScrollPane, 0, SpringLayout.WEST, otherInformationLabel);

    // [4] Add Swing components to content pane.
    add(cancellationPolicyLabel);
    add(canPolTAScrollPane);
    add(otherInformationLabel);
    add(otherInfoTAScrollPane);
}

private class CancelPolicyMouseListener extends MouseAdapter {

    public void mouseClicked(MouseEvent e){

        if(e.getClickCount() == 1){

            String cancelPolicyText = cancellationPolicyTA.getText();

            if (cancelPolicyText.length() > 0) {

                String dialogTitle = "15. Additional Information";
                String borderTitle = cancellationPolicyBorderTXT;

                McGyver.popCustomDialogTextAreaObject(dialogTitle, borderTitle, cancelPolicyText);
            }
        }
    }
} }

请注意上面的最后一段代码>>这就是定制JDialog被激发或调用的地方

我有一个运行整个应用程序的主类：

public class Stan_App extends JFrame {

// [1] Instantiate all SWING components needed for this application.
public static Stan_App stanFrame;
private McGyver mcGyver = new McGyver();
public Panel_Other_Information additionalInformation = new Panel_Other_Information();

public Stan_App (String title) {
    super(title);

    // [1] Set LayoutManager
    SpringLayout layout = new SpringLayout();
    setLayout(layout);
    setBackground(Color.CYAN);

     ////////////////////////////////////////////////////////////////////////
    //   [2]  Define the layout of components - component-by-component    //
    ////////////////////////////////////////////////////////////////////////

    //-- Component 1 - JPanel - Additional Information --//
    layout.putConstraint(SpringLayout.NORTH, additionalInformation, 17, SpringLayout.SOUTH, neighbourhoodRating);
    layout.putConstraint(SpringLayout.WEST, additionalInformation, 20, SpringLayout.EAST, inRoomFacilities);


    // [3] Add Swing components to content pane.
    Container conTain = getContentPane();
    conTain.add(additionalInformation);
}

public static void main (String[] args) {

    SwingUtilities.invokeLater (new Runnable() {

        @Override
        public void run() {

            createStanAppGUI();
        }
    });
}

private static void createStanAppGUI () {

    // Override the default Font for the application.
    McGyver.setUIFont(McGyver.APP_GLOBAL_FONT);

    // This code chuck lays out the visual components (GUI) of the app.
    stanFrame = new Stan_App (" S.T.A. Namibia  -  Database Manager " + "   |   THEME: " + McGyver.currentlySelectedAppThemeColor + "   |");
    // UIManager.getLookAndFeelDefaults().put("defaultFont", new Font("Noto Sans", Font.BOLD, 42));
    stanFrame.setDefaultCloseOperation(WindowConstants.DISPOSE_ON_CLOSE);
    stanFrame.setSize(1925, 1050);
    stanFrame.setResizable(false);
    stanFrame.setVisible(true);

    themeColorCB.setSelectedItem(McGyver.currentlySelectedAppThemeColor);
}
public void setCancellationTextFromCustomPopupDialog (String suppliedText) {
    additionalInformation.setCancellation_Policy_TextArea_Value(suppliedText);
} }

public class McGyver {

public static JDialog custPopupDialog;

public static void popCustomDialogTextAreaObject (String dialogTitle, String borderTitle, String inputString) {

    Panel_Custom_Dialog custDial = new Panel_Custom_Dialog(Stan_App.stanFrame, borderTitle, inputString);

    final int widthCB = 500;
    final int heightCB = 400;

    custPopupDialog = new JDialog();
    custPopupDialog.setTitle(dialogTitle);
    custPopupDialog.add(custDial);
    custPopupDialog.setSize(new Dimension(widthCB, heightCB)); /* Size(550, 450); */
    custPopupDialog.setModal(true);
    custPopupDialog.setLocationRelativeTo(null);
    custPopupDialog.setVisible(true);
} }

我有一个特殊的助手类，在这个类中，我保存了所有有用的代码，以便在整个应用程序中实现：

public class Stan_App extends JFrame {

// [1] Instantiate all SWING components needed for this application.
public static Stan_App stanFrame;
private McGyver mcGyver = new McGyver();
public Panel_Other_Information additionalInformation = new Panel_Other_Information();

public Stan_App (String title) {
    super(title);

    // [1] Set LayoutManager
    SpringLayout layout = new SpringLayout();
    setLayout(layout);
    setBackground(Color.CYAN);

     ////////////////////////////////////////////////////////////////////////
    //   [2]  Define the layout of components - component-by-component    //
    ////////////////////////////////////////////////////////////////////////

    //-- Component 1 - JPanel - Additional Information --//
    layout.putConstraint(SpringLayout.NORTH, additionalInformation, 17, SpringLayout.SOUTH, neighbourhoodRating);
    layout.putConstraint(SpringLayout.WEST, additionalInformation, 20, SpringLayout.EAST, inRoomFacilities);


    // [3] Add Swing components to content pane.
    Container conTain = getContentPane();
    conTain.add(additionalInformation);
}

public static void main (String[] args) {

    SwingUtilities.invokeLater (new Runnable() {

        @Override
        public void run() {

            createStanAppGUI();
        }
    });
}

private static void createStanAppGUI () {

    // Override the default Font for the application.
    McGyver.setUIFont(McGyver.APP_GLOBAL_FONT);

    // This code chuck lays out the visual components (GUI) of the app.
    stanFrame = new Stan_App (" S.T.A. Namibia  -  Database Manager " + "   |   THEME: " + McGyver.currentlySelectedAppThemeColor + "   |");
    // UIManager.getLookAndFeelDefaults().put("defaultFont", new Font("Noto Sans", Font.BOLD, 42));
    stanFrame.setDefaultCloseOperation(WindowConstants.DISPOSE_ON_CLOSE);
    stanFrame.setSize(1925, 1050);
    stanFrame.setResizable(false);
    stanFrame.setVisible(true);

    themeColorCB.setSelectedItem(McGyver.currentlySelectedAppThemeColor);
}
public void setCancellationTextFromCustomPopupDialog (String suppliedText) {
    additionalInformation.setCancellation_Policy_TextArea_Value(suppliedText);
} }

public class McGyver {

public static JDialog custPopupDialog;

public static void popCustomDialogTextAreaObject (String dialogTitle, String borderTitle, String inputString) {

    Panel_Custom_Dialog custDial = new Panel_Custom_Dialog(Stan_App.stanFrame, borderTitle, inputString);

    final int widthCB = 500;
    final int heightCB = 400;

    custPopupDialog = new JDialog();
    custPopupDialog.setTitle(dialogTitle);
    custPopupDialog.add(custDial);
    custPopupDialog.setSize(new Dimension(widthCB, heightCB)); /* Size(550, 450); */
    custPopupDialog.setModal(true);
    custPopupDialog.setLocationRelativeTo(null);
    custPopupDialog.setVisible(true);
} }

请注意：我显然已经对代码进行了大量清理，只显示了重要的部分

单击JTextArea时，我需要的自定义对话框从JTextArea中提取所有当前文本，然后允许用户继续编辑自定义JDialog中另一个JTextArea中的文本（即custPopupDialog）。当用户单击自定义JDialog中的“OK”按钮时，来自自定义对话框的文本应反馈到主类的原始（即cancellationPolicTA）JTextArea

一切正常（即数据被拉入自定义JDialog并正确显示JDialog），但当用户单击自定义JDialog内的“OK”按钮时，文本数据不会返回到原始JTextArea。请帮忙。提前谢谢

我忘了粘贴自定义JDialog代码-（见下文）：

公共类面板自定义对话框扩展了JPanel{

---

请参阅使用注释更新的部分代码

首先从Panel\u Custom\u Dialog类中删除stanAPP=new Stan\u App（“”）；并传递对它的引用，因为它应该在其他地方实例化

McGyver.popCustomDialogTextAreaObject(dialogTitle, borderTitle, cancelPolicyText);

//* the popCustomDialog is Modal, this code above should block until the user hits ok or cancel, 
String updatedText = McGyver.getInputString();
cancellationPolicyTA.setText(updatedText);

在Mcgyver类和PopCustomDialogTextArea对象中，您需要返回更新文本的方法。请参阅下面添加的带注释的方法

public class McGyver {

public static JDialog custPopupDialog;
public static Panel_Custom_Dialog custDial

public static void popCustomDialogTextAreaObject (String dialogTitle, String borderTitle, String inputString) {

    custDial = new Panel_Custom_Dialog(borderTitle, inputString);

    final int widthCB = 500;
    final int heightCB = 400;

    custPopupDialog = new JDialog();
    custPopupDialog.setTitle(dialogTitle);
    custPopupDialog.add(custDial);
    custPopupDialog.setSize(new Dimension(widthCB, heightCB)); /* Size(550, 450); */
    custPopupDialog.setModal(true);
    custPopupDialog.setLocationRelativeTo(null);
    custPopupDialog.setVisible(true);
  } 
  //* add a method that will return the updated string.  
  //* for this to work, Panel_Custom_Dialog should have a method that will return the updated text
  public static string getInputString()
  {
    return custDial.getInputString();  
  }
}

---

我在你的McGyver类中没有看到返回更新文本的方法来更新cancellationPolicyTA。custPopupDialog是模态的，所以你应该阻止它，直到用户点击ok和cancel，然后你才能返回更新文本Faljbour，你能用一个代码示例解释一下吗，因为我发现很难理解你说的话。我添加了代码示例，如果仍然不清楚，请告诉我您不需要其他方法来返回更新的文本您可以保留getCust_Dialog_TextArea_值或GetInputStringThank，Faljbour…我意识到-稍后会清理它-只是先将您的代码与我的代码进行比较。但这仍然不能解决问题。有可能吗ps其他一些我做得不对的事情，阻止或否定了原始JTextArea中文本的更新？我尝试了您的建议Faljbour，但它仍然不起作用。单击“面板自定义对话框”中的确认按钮后，有一个最终的处置方法。这不就是消除从“面板自定义”传递的所有数据吗_对话框“？如果是，则调用”custDial.getInputString（）'不会产生任何数据，是吗？我对此不太清楚…请提供建议。谢谢这只是一个想法哦，你应该如何设计代码，你需要一个方法从面板的自定义对话框返回修改过的更新文本，该文本应该传递回cancellationPolicyTA。你添加了该方法，你可能想显示面板的代码_自定义对话框。为了回答您的问题，是的，它将生成数据。Faljbour，我现在添加了“Panel\u Custom\u Dialog”代码。根据您添加的其他代码，即使在返回并处理对话框后，它也应该可以正常工作。