Java - 如何创建自定义对话框？

java swing jframe joptionpane jdialog

2022-08-31 23:57:16

我在JFrame上有一个按钮，当单击它时，我希望弹出一个对话框，其中包含多个文本区域供用户输入。我一直在四处寻找，试图弄清楚如何做到这一点，但我一直变得越来越困惑。任何人都可以帮忙吗？

答案 1

如果您不需要太多的自定义行为，JOptionPane是一个很好的节省时间的方法。它负责“确定/取消”选项的放置和本地化，并且是一种快速而肮脏的方式来显示自定义对话框，而无需定义自己的类。大多数时候，JOptionPane中的“message”参数是一个字符串，但你也可以传入JComponent或JComponents数组。

例：

JTextField firstName = new JTextField();
JTextField lastName = new JTextField();
JPasswordField password = new JPasswordField();
final JComponent[] inputs = new JComponent[] {
        new JLabel("First"),
        firstName,
        new JLabel("Last"),
        lastName,
        new JLabel("Password"),
        password
};
int result = JOptionPane.showConfirmDialog(null, inputs, "My custom dialog", JOptionPane.PLAIN_MESSAGE);
if (result == JOptionPane.OK_OPTION) {
    System.out.println("You entered " +
            firstName.getText() + ", " +
            lastName.getText() + ", " +
            password.getText());
} else {
    System.out.println("User canceled / closed the dialog, result = " + result);
}

答案 2

试试这个简单的类，根据自己的喜好自定义对话框：

import java.util.ArrayList;
import java.util.List;

import javax.swing.JComponent;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JRootPane;

public class CustomDialog
{
    private List<JComponent> components;

    private String title;
    private int messageType;
    private JRootPane rootPane;
    private String[] options;
    private int optionIndex;

    public CustomDialog()
    {
        components = new ArrayList<>();

        setTitle("Custom dialog");
        setMessageType(JOptionPane.PLAIN_MESSAGE);
        setRootPane(null);
        setOptions(new String[] { "OK", "Cancel" });
        setOptionSelection(0);
    }

    public void setTitle(String title)
    {
        this.title = title;
    }

    public void setMessageType(int messageType)
    {
        this.messageType = messageType;
    }

    public void addComponent(JComponent component)
    {
        components.add(component);
    }

    public void addMessageText(String messageText)
    {
        JLabel label = new JLabel("<html>" + messageText + "</html>");

        components.add(label);
    }

    public void setRootPane(JRootPane rootPane)
    {
        this.rootPane = rootPane;
    }

    public void setOptions(String[] options)
    {
        this.options = options;
    }

    public void setOptionSelection(int optionIndex)
    {
        this.optionIndex = optionIndex;
    }

    public int show()
    {
        int optionType = JOptionPane.OK_CANCEL_OPTION;
        Object optionSelection = null;

        if(options.length != 0)
        {
            optionSelection = options[optionIndex];
        }

        int selection = JOptionPane.showOptionDialog(rootPane,
                components.toArray(), title, optionType, messageType, null,
                options, optionSelection);

        return selection;
    }

    public static String getLineBreak()
    {
        return "<br>";
    }
}