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

Question

我在主布局中有一个 JTextArea，我想使用自定义 JDialog 对其进行更新。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：

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 >> 这是触发或调用自定义 JDialog 的地方。

我有运行整个应用程序的主要class：

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);
} }

我有一个特殊的帮手 class - 我将所有有用的代码保存在整个应用程序中：

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：我显然已经清理了很多代码以仅显示重要部分。

我需要的自定义对话框在单击 JTextArea 时从 JTextArea 中提取所有当前文本，然后允许用户继续在自定义 JDialog（即 custPopupDialog）中的另一个 JTextArea 中编辑文本。当用户单击自定义 JDialog 内的 'OKAY' 按钮时，自定义对话框中的文本应反馈到主要 class.

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），但是当用户单击自定义 JDialog。请帮忙。提前致谢。

我忘记粘贴自定义 JDialog 代码 -（见下文）：

public class Panel_Custom_Dialog extends JPanel {

Stan_App stanAPP;
String borderHeaderString, editedCancellationPolicyTXT;
private JTextArea custDialogTA;
private Panel_Other_Information otherInfoPanel = new Panel_Other_Information();

public Panel_Custom_Dialog (Stan_App stanApp, String borderTitle, String inputMessageString) {

    stanAPP = stanApp;

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

    if (borderTitle == null) {

        borderHeaderString = " Section Header Here! ";

    } else {

        borderHeaderString = borderTitle;
    }

    // [1] Define the Dimensions of the Panel.
    Dimension panelSize = getPreferredSize();
    panelSize.width = 500;
    panelSize.height = 400;
    setPreferredSize(panelSize);
    setBorder(BorderFactory.createTitledBorder(borderHeaderString));

    // [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 the
    final int widthCB = 450;
    final int heightCB = 300;

    // [4] Define the required components for this Panel.
    custDialogTA = new JTextArea(inputMessageString);
    custDialogTA.setBounds(5, 5, 0, 0);
    custDialogTA.setLineWrap(true);
    custDialogTA.setWrapStyleWord(true);

    JScrollPane custDialogTextAreaScrollPane = new JScrollPane(custDialogTA);
    custDialogTextAreaScrollPane.setPreferredSize(new Dimension(widthCB, heightCB));

    // [3] Define the Button size fields.
    final int widthBTN = 100;
    final int heightBTN = 25;

    JButton affirmativeBTN = new JButton(" OKAY "); affirmativeBTN.addActionListener(new CustomDialogAffirmationActionListener());
    JButton cancellationBTN = new JButton(" CANCEL "); cancellationBTN.addActionListener(new CustomDialogCancellationActionListener());
    affirmativeBTN.setPreferredSize(new Dimension(widthBTN, heightBTN));
    cancellationBTN.setPreferredSize(new Dimension(widthBTN, heightBTN));

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

    /* -- Component 1 - Additional Information - Custom Dialog TextArea */
    layout.putConstraint(SpringLayout.NORTH, custDialogTextAreaScrollPane, 5, SpringLayout.NORTH, thisPanel);
    layout.putConstraint(SpringLayout.WEST, custDialogTextAreaScrollPane, 0, SpringLayout.EAST, thisPanel);

    /* -- Component 2 - Additional Information - Custom Dialog Affirmation  Button */
    layout.putConstraint(SpringLayout.NORTH, affirmativeBTN, 10, SpringLayout.SOUTH, custDialogTextAreaScrollPane);
    layout.putConstraint(SpringLayout.WEST, affirmativeBTN, 0, SpringLayout.EAST, thisPanel);

    /* -- Component 3 - Additional Information - Custom Dialog Cancellation Button */
    layout.putConstraint(SpringLayout.NORTH, cancellationBTN, 0, SpringLayout.NORTH, affirmativeBTN);
    layout.putConstraint(SpringLayout.WEST, cancellationBTN, 25, SpringLayout.EAST, affirmativeBTN);

    // [5] Add the components defined above to the panel.
    add(custDialogTextAreaScrollPane);
    add(affirmativeBTN);
    add(cancellationBTN);
}


public String getCust_Dialog_TextArea_Value () {

    return custDialogTA.getText();
}

public void setCust_Dialog_TextArea_Value (String inputString) {

    custDialogTA.setText(inputString);
}

private class CustomDialogAffirmationActionListener implements ActionListener {

    @Override
    public void actionPerformed(ActionEvent e) {

        if (borderHeaderString.equals(otherInfoPanel.cancellationPolicyBorderTXT)) {

            editedCancellationPolicyTXT = custDialogTA.getText();

            stanAPP.setCancellationTextFromCustomPopupDialog(editedCancellationPolicyTXT);

            McGyver.custPopupDialog.dispose();

        } else if (borderHeaderString.equals(otherInfoPanel.additionalInformationBorderTXT)) {

            editedCancellationPolicyTXT = custDialogTA.getText();

            stanAPP.setOtherInformationTextFromCustomPopupDialog(editedCancellationPolicyTXT);

            McGyver.custPopupDialog.dispose();
        }
    }
}

private class CustomDialogCancellationActionListener implements ActionListener {

    @Override
    public void actionPerformed(ActionEvent e) {

        McGyver.custPopupDialog.dispose();
    }
} }

Answer 1

查看一些更新了注释的代码，

首先删除stanAPP = new Stan_App("");来自 Panel_Custom_Dialog class 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 class 和 popCustomDialogTExtAreaObject 中，您需要 return 更新文本的方法。请参阅下面添加的方法和注释，

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();  
  }
}

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

Update JTextArea text in JFrame from Custom JDialog output data or results

java

swing

jpanel

jdialog

jtextarea