java - 首次尝试简单的 GUI

Question

我正在尝试自学如何使用 Java swing 和 Window Builder Pro 制作 GUI，在观看了几个 youtube 视频并阅读了一些教程后，我已经完成了以下任务。

import javax.swing.JFrame;
import javax.swing.JTabbedPane;
import javax.swing.JPanel;
import javax.swing.SpringLayout;
import javax.swing.JTextPane;
import javax.swing.JButton;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;


public class JetstreamFrame extends JFrame {

private static final long serialVersionUID = 1L;
JTabbedPane tabPane;

JPanel buttonOnePanel;
JPanel buttonTwoPanel;
JPanel textDisplayPanel;
JTextPane textPane;
SpringLayout sl_textDisplayPanel;
SpringLayout springLayout;
SpringLayout sl_buttonTwoPanel;
SpringLayout sl_buttonOnePanel;
JButton ButtonTwo;
JButton ButtonOne;

public JetstreamFrame() {
    springLayout = new SpringLayout();
    getContentPane().setLayout(springLayout);

    tabPane = new JTabbedPane(JTabbedPane.TOP);
    setupTabPane();

    buttonOnePanel = new JPanel();
    sl_buttonOnePanel = new SpringLayout();
    setupButtonOnePanel();

    ButtonOne = new JButton("Click Here!");
    setupButtonOne();

    buttonTwoPanel = new JPanel();
    sl_buttonTwoPanel = new SpringLayout();
    setupButtonTwoPanel();

    ButtonTwo = new JButton("Click Here!");
    setupButtonTwo();

    textDisplayPanel = new JPanel();
    sl_textDisplayPanel = new SpringLayout();
    setupTextDisplayPanel();

    textPane = new JTextPane();
    setupTextPane();

}

private void setupTabPane()
{
    springLayout.putConstraint(SpringLayout.NORTH, tabPane, 0, SpringLayout.NORTH, getContentPane());
    springLayout.putConstraint(SpringLayout.WEST, tabPane, 0, SpringLayout.WEST, getContentPane());
    springLayout.putConstraint(SpringLayout.SOUTH, tabPane, -198, SpringLayout.SOUTH, getContentPane());
    springLayout.putConstraint(SpringLayout.EAST, tabPane, 484, SpringLayout.WEST, getContentPane());
    getContentPane().add(tabPane);
}

private void setupButtonOnePanel()
{
    tabPane.addTab("Tab One", null, buttonOnePanel, null);
    buttonOnePanel.setLayout(sl_buttonOnePanel);
}

private void setupButtonOne()
{
    ButtonOne.addActionListener(new ActionListener() {
        public void actionPerformed(ActionEvent arg0) 
        {

        }
    });
    sl_buttonOnePanel.putConstraint(SpringLayout.NORTH, ButtonOne, 99, SpringLayout.NORTH, buttonOnePanel);
    sl_buttonOnePanel.putConstraint(SpringLayout.WEST, ButtonOne, 187, SpringLayout.WEST, buttonOnePanel);
    buttonOnePanel.add(ButtonOne);
}

private void setupButtonTwoPanel()
{
    tabPane.addTab("Tab Two", null, buttonTwoPanel, null);
    buttonTwoPanel.setLayout(sl_buttonTwoPanel);
}

private void setupButtonTwo()
{
    ButtonTwo.addActionListener(new ActionListener() {
        public void actionPerformed(ActionEvent arg0) 
        {

        }
    });
    sl_buttonTwoPanel.putConstraint(SpringLayout.NORTH, ButtonTwo, 99, SpringLayout.NORTH, buttonTwoPanel);
    sl_buttonTwoPanel.putConstraint(SpringLayout.WEST, ButtonTwo, 187, SpringLayout.WEST, buttonTwoPanel);
    buttonTwoPanel.add(ButtonTwo);
}

private void setupTextDisplayPanel()
{
    springLayout.putConstraint(SpringLayout.NORTH, textDisplayPanel, 6, SpringLayout.SOUTH, tabPane);
    springLayout.putConstraint(SpringLayout.WEST, textDisplayPanel, 0, SpringLayout.WEST, getContentPane());
    springLayout.putConstraint(SpringLayout.SOUTH, textDisplayPanel, -10, SpringLayout.SOUTH, getContentPane());
    springLayout.putConstraint(SpringLayout.EAST, textDisplayPanel, 0, SpringLayout.EAST, getContentPane());
    getContentPane().add(textDisplayPanel); 
    textDisplayPanel.setLayout(sl_textDisplayPanel);
}

private void setupTextPane()
{
    sl_textDisplayPanel.putConstraint(SpringLayout.NORTH, textPane, 0, SpringLayout.NORTH, textDisplayPanel);
    sl_textDisplayPanel.putConstraint(SpringLayout.WEST, textPane, 0, SpringLayout.WEST, textDisplayPanel);
    sl_textDisplayPanel.putConstraint(SpringLayout.SOUTH, textPane, 182, SpringLayout.NORTH, textDisplayPanel);
    sl_textDisplayPanel.putConstraint(SpringLayout.EAST, textPane, 0, SpringLayout.EAST, textDisplayPanel);
    textDisplayPanel.add(textPane);
}

public void start()
{
    this.setSize(500, 500);
    this.setVisible(true);
}

}

这段代码的前提是创建一个带有多个选项卡的窗口，以及底部可见的文本区域，无论用户在哪个选项卡中。我已经创建了文本区域、选项卡、按钮，如下所示以及此 GUI 的按钮事件监听器。

不幸的是，我阅读的所有教程都没有向我展示如何将任何内容打印到文本区域。我想要一些类似的东西

System.out.println();

附加到每个按钮，并在文本区域显示该打印，但我不知道如何完成此操作。

我还想知道如果打印的文本超出可见框架，我创建的文本区域是否会在侧面出现滚动条。

Answer 1

textpane.append("TEXTHERE");

将根据事件将任何需要的文本添加到您的文本区域。当我们 append() 文本时，我们还可以将新文本添加到现有段落中。如果您想清除 JTextArea，那么我建议您调用 setText() 方法。

需要 JScrollPane 才能将滚动条添加到 JTextArea，这可以通过以下方式完成:

import javax.swing.JScrollPane;
JScrollPane scrollPane = new JScrollPane(TEXTAREAHERE);

我个人喜欢将滚动 Pane 的属性设置为此，以确保 JScrollBar 只能向上和向下滚动并删除向左和向右滚动:

scrollPane.setHorizo​​nalScrollBarPolicy(JScrollPane.HORIZONTAL_SCROLLBAR_​​NEVER);