Question

这是我第一次来这里我正在编写一个GUI驱动的程序，它允许我在.txt文件上执行Caesar的密码。
但是，在我添加ActionListener和ChangeListener之前，我决定测试GUI。这是我得到的： enter image description here

以下是代码：

package implementation;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.event.*;
public class Frame extends JFrame{
    public Frame(){
        super("Caesar[E]");
        this.setVisible(true);
        this.setLocationRelativeTo(null);
        /*Adding the options to GUI*/
        factor.setPreferredSize(new Dimension(30,30));
        JToolBar toolbar = new JToolBar();
        radio.add(encrypt);
        radio.add(decrypt);
        toolbar.add(encrypt);
        toolbar.add(decrypt);
        toolbar.add(factor);
        toolbar.setFloatable(false);

        /*Adding the JTextArea for input*/
        Box inputBound = Box.createHorizontalBox();
        Box inputBound_text = Box.createVerticalBox();
        Box inputBound_buttons = Box.createVerticalBox();
        inputScroll.add(input);
        inputScroll.setEnabled(true);
        input.setEditable(true);
        inputScroll.setBorder(BorderFactory.createTitledBorder("Text/File for Encryption/" +
                "Decryption"));
        inputBound_text.add(inputScroll);
        inputBound_buttons.add(openFile);
        inputBound_buttons.add(cancelFileInput);
        inputBound.add(inputBound_text);
        inputBound.add(Box.createHorizontalStrut(25));
        inputBound.add(inputBound_buttons);

        /*Adding JTextArea for output*/
        Box outputBound = Box.createHorizontalBox();
        Box outputBound_text = Box.createVerticalBox();
        Box outputBound_buttons = Box.createVerticalBox();
        outputScroll.add(output);
        output.setEditable(true);
        outputScroll.setBorder(BorderFactory.createTitledBorder("Text After Encryption" +
                "/Decryption"));
        outputBound_text.add(outputScroll);
        outputBound_buttons.add(saveFile);
        outputBound_buttons.add(send);
        outputBound.add(outputBound_text);
        outputBound.add(Box.createHorizontalStrut(25));
        outputBound.add(outputBound_buttons);
        outputBound.setSize(150, 200);

        /*Adding JButton for performing the action*/
        this.add(performAction,BorderLayout.SOUTH);

        /*Adding the components to the Frame*/
        Box outerBox = Box.createVerticalBox();
        outerBox.add(toolbar,BorderLayout.NORTH);
        outerBox.add(inputBound);
        outerBox.add(outputBound);
        this.add(outerBox);
        this.setSize(500, 700);
    }
    boolean isFileInput = false;
    boolean isEncrypt = true;
    JButton performAction = new JButton("Encrypt!");
    JButton openFile = new JButton("Open a File");
    JButton cancelFileInput = new JButton("Cancel File Input");
    JButton saveFile = new JButton("Save File");
    JButton send = new JButton("Send");
    JTextArea input = new JTextArea();
    JTextArea output = new JTextArea();
    JFileChooser chooser = new JFileChooser();
    JScrollPane inputScroll = new JScrollPane();
    JScrollPane outputScroll = new JScrollPane();
    ButtonGroup radio = new ButtonGroup();
    JRadioButton encrypt = new JRadioButton("Encrypt",true);
    JRadioButton decrypt = new JRadioButton("Decrypt",false);
    JSpinner factor = new JSpinner(new SpinnerNumberModel(1,1,26,1));

    public static void main(String[] args) {
        SwingUtilities.invokeLater(new Runnable(){
            @Override
            public void run(){
                new Frame();
            }
        });
    }
}

请告诉我如何解决问题，如图所示？

我知道我可以使用setPreferredSize()但是如何确保输入正确的维度而不进行反复试验？

Answer 1

我喜欢SpringLayout，它非常灵活，而且它不能做很多事情。特别是你不再需要关心setPreferredSize了。只需搜索它，就有足够的资源。

SpringLayout允许您定义元素相对于其他元素的大小 - 例如，您可以确保按钮看起来相同。

Answer 2

我建议将MiGLayout作为LayoutManager。在MiGLayout中，这样的事情很容易

Answer 3

试错法 永远是获得所需布局的好方法。而是使用JTextArea构造函数，让您说出所需的行数和列数。

JTextArea(int rows, int columns)

JTextArea会为您pack()窗口计算一个不错的首选尺寸，而您不需要setSize()。

编辑：您说，“JTextArea无效。我无法在其中输入文字。”

而不是add()，请使用setViewportView()：

inputScroll.setViewportView(input);
...
outputScroll.setViewportView(output);
...

Answer 4

在这种情况下，我喜欢将我的应用程序划分为责任范围。这样可以保持代码清洁和自包含，允许我在需要时替换部分代码，而不会对应用程序的其余部分产生负面影响。

这也意味着您可以专注于每个部分的个性化需求。

对于复杂的布局，使用具有单独布局管理器的复合容器总是更好（恕我直言），它降低了奇怪的交叉行为的复杂性和潜力。

enter image description here

public class BadLayout07 {

    public static void main(String[] args) {
        new BadLayout07();
    }

    public BadLayout07() {
        EventQueue.invokeLater(new Runnable() {
            @Override
            public void run() {
                try {
                    UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
                } catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
                }

                JFrame frame = new JFrame("Testing");
                frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
                frame.setLayout(new BorderLayout());
                frame.add(new MasterPane());
                frame.pack();
                frame.setLocationRelativeTo(null);
                frame.setVisible(true);
            }
        });
    }

    public class MasterPane extends JPanel {

        public MasterPane() {
            EncryptSettings encryptSettings = new EncryptSettings();
            InputPane inputPane = new InputPane();
            OutputPane outputPane = new OutputPane();

            setLayout(new GridBagLayout());
            GridBagConstraints gbc = new GridBagConstraints();
            gbc.gridx = 0;
            gbc.gridy = 0;
            gbc.weightx = 1;
            gbc.fill = GridBagConstraints.HORIZONTAL;

            add(encryptSettings, gbc);

            gbc.gridy++;
            gbc.weighty = 1;
            gbc.fill = gbc.BOTH;
            add(inputPane, gbc);

            gbc.gridy++;
            add(outputPane, gbc);
        }

    }

    public class EncryptSettings extends JPanel {

        private JRadioButton encrypt;
        private JRadioButton decrypt;
        private JSpinner factor;

        public EncryptSettings() {
            encrypt = new JRadioButton("Encrypt");
            decrypt = new JRadioButton("Decrypt");
            ButtonGroup bg = new ButtonGroup();
            bg.add(encrypt);
            bg.add(decrypt);

            factor = new JSpinner(new SpinnerNumberModel(new Integer(1), new Integer(1), null, new Integer(1)));

            setLayout(new FlowLayout(FlowLayout.LEFT));
            add(encrypt);
            add(decrypt);
            add(factor);
        }

    }

    public class InputPane extends JPanel {

        private JTextArea input;
        private JButton open;
        private JButton close;

        public InputPane() {
            setBorder(new TitledBorder("Source Text"));
            input = new JTextArea();
            open = new JButton("Open");
            close = new JButton("Close");

            JPanel tb = new JPanel(new FlowLayout(FlowLayout.LEFT));
            tb.add(open);
            tb.add(close);

            setLayout(new BorderLayout());
            add(tb, BorderLayout.NORTH);
            add(new JScrollPane(input));
        }

    }

    public class OutputPane extends JPanel {

        private JTextArea output;
        private JButton save;
        private JButton send;

        public OutputPane() {
            setBorder(new TitledBorder("Encrypted Text"));
            output = new JTextArea();
            output.setEditable(false);
            save = new JButton("Save");
            send = new JButton("Send");

            JPanel tb = new JPanel(new FlowLayout(FlowLayout.LEFT));
            tb.add(save);
            tb.add(send);

            setLayout(new BorderLayout());
            add(tb, BorderLayout.NORTH);
            add(new JScrollPane(output));
        }

    }

}

我没有互连任何功能，但它是根据需要提供适当的setter和getter以及适当的事件监听器的简单案例。

GUI变得不整洁

4 个答案: