從自定義JDialog輸出數據或結果更新JFrame中的JTextArea文本

Question

我要使用自定義JDialog更新主布局中的JTextArea 。 很難用這樣的詞來解釋...所以請遵循以下概述的代碼和解釋過程：

1. 我有一個包含需要更新的JTextArea（即原始JTextArea-'cancellationPolicTA'）的JPanel：

    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); } } } } } 

請注意上面>>的最后一段代碼，這是自定義JDialog被激發或調用的地方。

2. 我有運行整個應用程序的主類：

    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 (" STA 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); } } 

3. 我有一個特殊的幫助器類-在其中保存所有有用的代碼，以在整個應用程序中實施：

    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); } } 

請注意：我顯然已經清理了很多代碼，只顯示了重要部分。

當單擊JTextArea時，我需要的Custom Dialog從JTextArea中提取所有當前文本，然后允許用戶繼續編輯自定義JDialog中另一個JTextArea（即custPopupDialog）中的文本。 當用戶單擊定制JDialog內的“ OKAY”按鈕時，來自定制對話框的文本應反饋到主類的原始JTextArea（即cancelPolicTA）。

一切正常（例如，數據被拉入自定義JDialog中，並且JDialog正確顯示），但是當用戶單擊自定義JDialog中的“ OKAY”按鈕時，文本數據不會傳遞回原始JTextArea。 請幫忙。 提前致謝。

4. 我忘了粘貼自定義JDialog代碼-（請參見下文）：

公共類Panel_Custom_Dialog擴展了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

查看一些用注釋更新的代碼，

首先刪除stanAPP = new Stan_App（“”）; 從Panel_Custom_Dialog類中傳遞並引用它，因為它應該在其他地方實例化，

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類和popCustomDialogTExtAreaObject中，您需要將返回更新后的文本的方法。 請參閱以下帶有注釋的添加方法，

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();  
  }
}