Java JPanel在JScrollPane中的位置
有了这段代码,我可以在Java JPanel在JScrollPane中的位置,java,swing,jpanel,jscrollpane,layout-manager,Java,Swing,Jpanel,Jscrollpane,Layout Manager,有了这段代码,我可以在JScrollPane中轻松创建按钮。我使用了滚动窗格,因为将来按钮会很多 现在,如果只有一个“代码> jPoCTs/CODE”按钮,它会显示在滚动窗格的中间,而应该显示在顶部。p> 有可能吗 JPanel pane = new JPanel(new GridBagLayout()); JButton button; pane.setLayout(new GridBagLayout()); GridBagConstraints c = new GridBagConstra
JScrollPane
中轻松创建按钮。我使用了滚动窗格,因为将来按钮会很多
现在,如果只有一个“代码> jPoCTs/CODE”按钮,它会显示在滚动窗格的中间,而应该显示在顶部。p> 有可能吗
JPanel pane = new JPanel(new GridBagLayout());
JButton button;
pane.setLayout(new GridBagLayout());
GridBagConstraints c = new GridBagConstraints();
c.fill = GridBagConstraints.HORIZONTAL;
button = new JButton("Button 1");
c.weightx = 0.5;
c.gridx = 0;
c.gridy = 0;
pane.add(button, c);
button = new JButton("Button 2");
c.gridx = 0;
c.gridy = 1;
pane.add(button, c);
button = new JButton("Button 3");
c.gridx = 1;
c.gridy = 1;
pane.add(button, c);
button = new JButton("Long-Named Button 4");
c.ipady = 40;
c.weightx = 0.0;
c.gridwidth = 3;
c.gridx = 0;
c.gridy = 2;
pane.add(button, c);
jScrollPane2.setViewportView(pane);
已编辑
基于装满鳗鱼的气垫船回复,我为多个JPanel创建了代码,但JPanel是水平可见的,而不是垂直可见的:
JPanel pane = new JPanel(new GridBagLayout());
for (int i = 0; i < 100; i++) {
JButton button;
pane.setLayout(new GridBagLayout());
GridBagConstraints c = new GridBagConstraints();
c.fill = GridBagConstraints.HORIZONTAL;
button = new JButton("Button 1");
c.weightx = 0.5;
c.gridx = 0;
c.gridy = 0;
pane.add(button, c);
button = new JButton("Button 2");
c.gridx = 0;
c.gridy = 1;
pane.add(button, c);
button = new JButton("Button 3");
c.gridx = 1;
c.gridy = 1;
pane.add(button, c);
button = new JButton("Long-Named Button 4");
c.ipady = 40;
c.weightx = 0.0;
c.gridwidth = 2;
c.gridx = 0;
c.gridy = 2;
pane.add(button, c);
}
JPanel borderLayoutPanel = new JPanel(new BorderLayout()); // wrapper JPanel
borderLayoutPanel.add(pane, BorderLayout.PAGE_START); // add pane to the top
jScrollPane2.setViewportView(borderLayoutPanel);
JPanel pane=newjpanel(newgridbaglayout());
对于(int i=0;i<100;i++){
按钮;
setLayout(新的GridBagLayout());
GridBagConstraints c=新的GridBagConstraints();
c、 填充=GridBagConstraints.HORIZONTAL;
按钮=新的JButton(“按钮1”);
c、 权重x=0.5;
c、 gridx=0;
c、 gridy=0;
窗格。添加(按钮,c);
按钮=新的JButton(“按钮2”);
c、 gridx=0;
c、 gridy=1;
窗格。添加(按钮,c);
按钮=新的JButton(“按钮3”);
c、 gridx=1;
c、 gridy=1;
窗格。添加(按钮,c);
按钮=新的JButton(“长名按钮4”);
c、 ipady=40;
c、 权重x=0.0;
c、 网格宽度=2;
c、 gridx=0;
c、 gridy=2;
窗格。添加(按钮,c);
}
JPanel borderLayoutPanel=newjpanel(new BorderLayout());//包装纸
borderLayoutPanel.add(窗格,BorderLayout.PAGE_START);//将窗格添加到顶部
jScrollPane2.setViewportView(borderLayoutPanel);
创建一个新的“包装器”JPanel,使用BorderLayout
,将您的窗格添加到包装器JPanel的BorderLayout.PAGE_START
位置,然后将相同的包装器JPanel添加到JScrollPane的视口中。例如:
JPanel borderLayoutPanel = new JPanel(new BorderLayout()); // wrapper JPanel
borderLayoutPanel.add(pane, BorderLayout.PAGE_START); // add pane to the top
jScrollPane2.setViewportView(borderLayoutPanel); // add wrapper to viewport
有关工作MCVE的示例,请查看:
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
@SuppressWarnings("serial")
public class Foo extends JPanel {
private static final int PREF_W = 400;
private static final int PREF_H = 600;
private JPanel gridPanel = new JPanel(new GridLayout(0, 1));
public Foo() {
JPanel buttonPanel = new JPanel();
buttonPanel.add(new JButton(new AbstractAction("Add Panel") {
@Override
public void actionPerformed(ActionEvent e) {
gridPanel.add(createButtonPanel());
gridPanel.revalidate();
gridPanel.repaint();
}
}));
JPanel borderLayoutPanel = new JPanel(new BorderLayout());
borderLayoutPanel.add(gridPanel, BorderLayout.PAGE_START);
JScrollPane scrollPane = new JScrollPane(borderLayoutPanel);
scrollPane.setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_ALWAYS);
setPreferredSize(new Dimension(PREF_W, PREF_H));
setLayout(new BorderLayout());
add(scrollPane);
add(buttonPanel, BorderLayout.PAGE_END);
}
private JPanel createButtonPanel() {
JPanel pane = new JPanel(new GridBagLayout());
pane.setBorder(BorderFactory.createLineBorder(Color.BLUE));
JButton button;
pane.setLayout(new GridBagLayout());
GridBagConstraints c = new GridBagConstraints();
c.fill = GridBagConstraints.HORIZONTAL;
c.anchor = GridBagConstraints.PAGE_START;
button = new JButton("Button 1");
c.weightx = 0.5;
c.gridx = 0;
c.gridy = 0;
pane.add(button, c);
button = new JButton("Button 2");
c.gridx = 0;
c.gridy = 1;
pane.add(button, c);
button = new JButton("Button 3");
c.gridx = 1;
c.gridy = 1;
pane.add(button, c);
button = new JButton("Long-Named Button 4");
c.ipady = 40;
c.weightx = 0.0;
c.gridwidth = 3;
c.gridx = 0;
c.gridy = 2;
pane.add(button, c);
return pane;
}
private static void createAndShowGui() {
Foo mainPanel = new Foo();
JFrame frame = new JFrame("Foo");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.getContentPane().add(mainPanel);
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
public static void main(String[] args) {
SwingUtilities.invokeLater(() -> createAndShowGui());
}
}
c.gridwidth=3代码>逻辑是什么?我认为c.gridwidth=2代码>更合适。顺便说一句-为了更快地获得更好的帮助,请发布一个or。@user2847219:正如安德鲁·汤普森所建议的,如果您仍然被卡住,请编辑您的问题,然后发布一个有效的、小的独立程序,小到可以作为问题中的代码格式文本,一个编译、运行并向我们展示您的问题的程序。@user2847219:还有什么JPanels?在发布的代码中不显示多个水平JPanel。同样,一个体面的MCVE会为我们解答这个问题。@user2847219:请参阅“编辑我的答案”,以获取我们要求您编写的代码类型的示例,并查看如何在JScrollPane中嵌套JPanel。我插入了新的image@user2847219:图像?请阅读或重读我们的评论。没有人在这里要求图像。