我制作了一个带有滚动 Pane 的程序,但它不起作用。请看源码:
JInfoView.java
package view;
import javax.swing.*;
import java.util.*;
import java.awt.*;
public class JInfoView extends JPanel {
private JButton button = new JButton("ADD");
private JButton buttonDelete = new JButton("DEL");
private JTextField input = new JTextField("Text", 5);
private JLabel label = new JLabel("Test");
public JInfoView() {
this.setLayout(new FlowLayout());
this.add(button);
this.add(buttonDelete);
this.add(input);
this.add(label);
}
}
JMainView.java
package view;
import java.awt.*;
import javax.swing.*;
import java.util.*;
import view.JInfoView;
public class JMainView extends JFrame {
private JPanel mypanel = new JPanel(new GridLayout(0, 1, 30, 50));
private JScrollPane scrollPane = new JScrollPane(mypanel);
public JMainView() {
super("Simple Example");
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
Container container = this.getContentPane();
container.setLayout(new FlowLayout());
container.add(scrollPane);
scrollPane.setVisible(true);
scrollPane.setAutoscrolls(true);
mypanel.add(new JInfoView());
mypanel.add(new JInfoView());
mypanel.add(new JInfoView());
mypanel.add(new JInfoView());
mypanel.add(new JInfoView());
mypanel.add(new JInfoView());
mypanel.add(new JInfoView());
mypanel.add(new JInfoView());
mypanel.add(new JInfoView());
}
public static void main(String[] args) {
JMainView app = new JMainView();
app.setVisible(true);
}
}
我读过一个教程,上面写着:
//In a container that uses a BorderLayout:
textArea = new JTextArea(5, 30);
...
JScrollPane scrollPane = new JScrollPane(textArea);
...
setPreferredSize(new Dimension(450, 110));
...
add(scrollPane, BorderLayout.CENTER);
我已经完成了相同的步骤,
private JPanel mypanel = new JPanel(new GridLayout(0, 1, 30, 50));
private JScrollPane scrollPane = new JScrollPane(mypanel);
然后添加滚动 Pane :
container.add(scrollPane);
哪里出错了? 编辑: 问题是滚动 Pane 不起作用。我向 mypanel 添加了许多 JInfoView, 但滚动不起作用..
最佳答案
如果 JScrollPane
位于 BorderLayout
的 CENTER
中,似乎工作正常。例如
import javax.swing.*;
import java.util.*;
import java.awt.*;
import java.awt.*;
import javax.swing.*;
import java.util.*;
public class JMainView extends JFrame {
private JPanel mypanel = new JPanel(new GridLayout(0, 1, 30, 50));
private JScrollPane scrollPane = new JScrollPane(mypanel);
public JMainView() {
super("Simple Example");
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
Container container = this.getContentPane();
container.setLayout(new BorderLayout());
container.add(scrollPane);
mypanel.add(new JInfoView());
mypanel.add(new JInfoView());
mypanel.add(new JInfoView());
mypanel.add(new JInfoView());
mypanel.add(new JInfoView());
mypanel.add(new JInfoView());
mypanel.add(new JInfoView());
mypanel.add(new JInfoView());
mypanel.add(new JInfoView());
}
public static void main(String[] args) {
JMainView app = new JMainView();
// important!
app.pack();
// show the scroll bars by compressing the GUI height
app.setSize(
(int)app.getSize().getWidth()+30,
(int)app.getSize().getHeight()/2);
app.setVisible(true);
}
}
class JInfoView extends JPanel {
private JButton button = new JButton("ADD");
private JButton buttonDelete = new JButton("DEL");
private JTextField input = new JTextField("Text", 5);
private JLabel label = new JLabel("Test");
public JInfoView() {
this.setLayout(new FlowLayout());
this.add(button);
this.add(buttonDelete);
this.add(input);
this.add(label);
}
}
关于java - JScrollPane问题,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/6068576/