Java 如何使JScrollPanel上的JPanel仅具有GridLayout填充宽度而不具有填充高度?
我尝试制作如下所示的布局。但我在添加新的MyPanel时遇到了一个问题。第一个MyPanel将填充其所有父面板(中间面板)。如何使MyPanel只采用所需的高度和填充宽度Java 如何使JScrollPanel上的JPanel仅具有GridLayout填充宽度而不具有填充高度?,java,swing,layout,Java,Swing,Layout,我尝试制作如下所示的布局。但我在添加新的MyPanel时遇到了一个问题。第一个MyPanel将填充其所有父面板(中间面板)。如何使MyPanel只采用所需的高度和填充宽度 public class Main extends JFrame { JPanel upPanel = new JPanel(); JPanel midPanel = new JPanel(); JPanel downPanel = new JPanel(); JButton button = new JButton("ad
public class Main extends JFrame {
JPanel upPanel = new JPanel();
JPanel midPanel = new JPanel();
JPanel downPanel = new JPanel();
JButton button = new JButton("add new Panel");
Main() {
this.setSize(800, 600);
this.setLayout(new BorderLayout());
this.add(upPanel, BorderLayout.PAGE_START);
JScrollPane jsp = new JScrollPane(midPanel);
this.add(jsp, BorderLayout.CENTER);
this.add(downPanel, BorderLayout.PAGE_END);
this.midPanel.setLayout(new GridLayout(0, 1, 3, 3));
upPanel.add(button);
button.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent arg0) {
midPanel.add(new MyPanel());
midPanel.updateUI();
}
});
}
public static void main(String[] args) {
new Main().setVisible(true);
}
}
class MyPanel extends JPanel {
MyPanel() {
this.setLayout(new GridLayout(2, 5, 5, 5));
this.setBorder(BorderFactory.createRaisedBevelBorder());
this.add(new JLabel("Nomo:"));
}
}
问题是您在中间添加了中间面板。中心使用全部可用空间。将中间面板设置为BorderLayout,然后在North向其添加另一个面板,然后在那里添加有效的MyPanels
public class Main extends JFrame {
JPanel upPanel = new JPanel();
JPanel newMidPanel = new JPanel();
JPanel downPanel = new JPanel();
JButton button = new JButton("add new Panel");
Main() {
this.setSize(800, 600);
this.setLayout(new BorderLayout());
JPanel midPanel = new JPanel(new BorderLayout());
this.add(upPanel, BorderLayout.PAGE_START);
JScrollPane jsp = new JScrollPane(midPanel);
this.add(jsp);
this.add(downPanel, BorderLayout.PAGE_END);
this.newMidPanel = new JPanel(new GridLayout(0, 1, 3, 3));
upPanel.add(button);
midPanel.add(newMidPanel, BorderLayout.NORTH);
button.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent arg0) {
newMidPanel.add(new MyPanel());
newMidPanel.updateUI();
}
});
}
public static void main(String[] args) {
new Main().setVisible(true);
}
}
class MyPanel extends JPanel {
MyPanel() {
this.setLayout(new GridLayout(2, 5, 5, 5));
this.setBorder(BorderFactory.createRaisedBevelBorder());
this.add(new JLabel("Nomo:"));
}
}
我相信如果你使用
wrap\u content
@JosefE。你能告诉我更多吗?它不是一个ID应用程序。它是JavaSwing.+1,用于一般解决方案-1,用于在添加面板时使用updateUI()方法。updateUI()方法在执行外观更改时由内部Swing方法使用,在面板中添加/删除组件时不应使用。相反,您应该使用revalidate()
和repaint()
方法。@camickr我只采用从到的代码并添加问题的答案。但你是对的:)