似乎唯一的選擇是設(shè)置行數(shù)，但我需要我的文本區(qū)域可以為用戶調(diào)整大小。JScrollPane 有幫助，但是當(dāng)有很多文本時，我想讓用戶調(diào)整區(qū)域本身的大小。我該怎么做呢？如果我可以為此目的使用另一個類，我會完全同意的。簡化的代碼是import javax.swing.*;import java.awt.*;public class Problematic { public static void main(String[] args) { JFrame f = new JFrame("frame"); f.setLayout(new BorderLayout()); JPanel p1 = new JPanel(); JPanel p = new JPanel(); JButton button = new JButton("Whatever here"); JTextArea t2 = new JTextArea(5, 30); JScrollPane scrollPane = new JScrollPane(t2); scrollPane.setSize(600, 400); scrollPane.setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_ALWAYS); t2.setText("this is some random text\nthat may go for many rows\nso it may look messy"); p1.add(button); p.add(scrollPane); f.add(p, BorderLayout.NORTH); f.add(p1, BorderLayout.CENTER); f.setSize(600, 500); f.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE); f.setVisible(true); }}
3 回答
慕的地6264312
TA貢獻(xiàn)1817條經(jīng)驗 獲得超6個贊
您可以使用JSplitPane使窗口的各個區(qū)域可調(diào)整大小。試試下面的例子。請參閱我在代碼中的評論。
import javax.swing.*;
import java.awt.*;
public class Problematic {
public static void main(String[] args) {
JFrame f = new JFrame("frame");
f.setLayout(new BorderLayout());
JPanel p1 = new JPanel();
JPanel p = new JPanel();
// Set BorderLayout so that scroll pane fills the panel
p.setLayout(new BorderLayout());
JButton button = new JButton("Whatever here");
JTextArea t2 = new JTextArea(5, 30);
JScrollPane scrollPane = new JScrollPane(t2);
// Setting scroll pane size is not necessary
//scrollPane.setSize(600, 400);
scrollPane.setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_ALWAYS);
t2.setText("this is some random text\nthat may go for many rows\nso it may look messy");
p1.add(button);
p.add(scrollPane);
// Use JSplitPane to make the panels resizable
f.add(new JSplitPane(JSplitPane.VERTICAL_SPLIT, p, p1), BorderLayout.CENTER);
f.setSize(600, 500);
f.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
f.setVisible(true);
}
}
慕婉清6462132
TA貢獻(xiàn)1804條經(jīng)驗 獲得超2個贊
作為第一個改進(jìn)，您可以進(jìn)行一些小的布局更改，這將JTextArea占用整個空間并隨著框架調(diào)整大?。?/p>
import java.awt.BorderLayout;
import java.awt.GridLayout;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.WindowConstants;
public class Problematic {
public static void main(String[] args) {
JFrame f = new JFrame("frame");
f.setLayout(new BorderLayout());
JPanel p = new JPanel(new GridLayout(1, 1)); //assign gridlayout so text area fills panel
JTextArea t2 = new JTextArea(5, 30);
t2.setText("this is some random text\nthat may go for many rows\nso it may look messy");
JScrollPane scrollPane = new JScrollPane(t2);
scrollPane.setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_ALWAYS);
p.add(scrollPane);
f.add(p, BorderLayout.CENTER); //place text area panel in center position
JPanel p1 = new JPanel();
JButton button = new JButton("Whatever here");
p1.add(button);
f.add(p1, BorderLayout.PAGE_END);
f.setSize(600, 500);
f.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
f.setVisible(true);
}
}
為了獲得更大的靈活性，您可以添加JSplitPane：
public class Problematic {
public static void main(String[] args) {
JFrame f = new JFrame("frame");
f.getContentPane().setLayout(new BorderLayout());
JPanel p1 = new JPanel();
JButton button = new JButton("Whatever here");
p1.add(button);
JPanel p = new JPanel(new GridLayout(1, 1)); //assign gridlayout so text area fills panel
JTextArea t2 = new JTextArea(5, 30);
t2.setText("this is some random text\nthat may go for many rows\nso it may look messy");
JScrollPane scrollPane = new JScrollPane(t2); scrollPane.setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_ALWAYS);
p.add(scrollPane);
JSplitPane splitPane = new JSplitPane(JSplitPane.VERTICAL_SPLIT, p,p1);
f.getContentPane().add(splitPane, BorderLayout.CENTER);
f.setSize(600, 500);
f.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
f.setVisible(true);
}
}
慕的地10843
TA貢獻(xiàn)1785條經(jīng)驗 獲得超8個贊
這是 c0der 的實現(xiàn)，但設(shè)置了更簡化的生命周期。每一行都解釋了正在發(fā)生的事情和時間。
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.text.JTextComponent;
public class TextApp implements Runnable {
private static final String APP_NAME = "Text App";
private JFrame frame;
private JTextArea txtAra;
private JButton button;
// This is a generic action that handles clearing the text of a JTextComponent
// It can also be a stand-alone class
private static class ClearAction <T extends JTextComponent> implements ActionListener {
private T txtAra;
public ClearAction(T txtAra) {
this.txtAra = txtAra;
}
@Override
public void actionPerformed(ActionEvent e) {
this.txtAra.setText("");
}
}
public TextApp() {
// Initialize instance fields
frame = new JFrame(APP_NAME);
txtAra = new JTextArea(5, 30);
button = new JButton("Clear Text");
// Internal panels used for layout
JPanel mainPanel = new JPanel(new GridLayout(1, 1));
JScrollPane scrollPane = new JScrollPane(txtAra);
JPanel buttonPanel = new JPanel();
// Add components to containers
frame.setLayout(new BorderLayout());
frame.add(mainPanel, BorderLayout.CENTER);
frame.add(buttonPanel, BorderLayout.PAGE_END);
mainPanel.add(scrollPane);
buttonPanel.add(button);
// Additional setup
scrollPane.setSize(600, 400);
scrollPane.setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_ALWAYS);
// Add listeners
button.addActionListener(new ClearAction(txtAra));
}
@Override
public void run() {
// Set text
txtAra.setText("this is some random text\nthat may go for many rows\nso it may look messy");
// Prepare frame
frame.pack();
frame.setLocationRelativeTo(null);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setVisible(true);
}
public static void main(String[] args) {
SwingUtilities.invokeLater(new TextApp());
}
}
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