我盯着我的小项目。
我有一个充满按钮的表格。按钮（示例＃）是在运行时基于提供的资源添加的。请参见下面的示例：
底层JFrame具有GridBox布局。第一行就是您所看到的，
button|button|textbox|button|button
第二行是简单的JScrollPane，其GridWidth和GridHeight设置为“ remainder”，有效地，应该填充窗口的其余部分，而无需添加到右侧的轻微填充。
这个JScrollPane包含另一个没有任何预设布局的JPanel，我用绝对值填充控件（此处为示例＃0至＃9的按钮）。当我缩小窗口时，面板会正确添加滚动条，使我可以滚动浏览这9个。请参见下文：
不幸的是，当我手动添加另一个示例时，滚动条无法显示。该按钮超出了窗口边界的一半，但是我无法滚动到它。编辑：实际上，这10个以上的所有示例均无法正确显示。无论它们是沿着这10条创建的，还是以后在运行时添加的，或者由我自己添加的。看到：
我怀疑滚动窗格或滚动窗格内部的面板有一些固定的边界，但我似乎找不到，问题出在哪里，我应该怎么做才能使程序正常工作。
提前致谢。
表单代码（删除了不必要的处理程序和不相关的方法）
如果看到TestCommonsButton，则它是扩展标准JButton的类，仅向其添加TestSuite类型属性。无论如何，目的都像标准的JButton一样
package forms;
import java.awt.Container;
import model.ModelConstants;
import java.awt.event.MouseEvent;
import java.util.*;
import javax.swing.JButton;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import model.*;
public class MainFrame extends javax.swing.JFrame {
/**
* Creates new form MainFrame
*/
public MainFrame() {
initComponents();
}
/**
* This method is called from within the constructor to initialize the form.
* WARNING: Do NOT modify this code. The content of this method is always
* regenerated by the Form Editor.
*/
@SuppressWarnings("unchecked")
// <editor-fold defaultstate="collapsed" desc="Generated Code">
private void initComponents() {
java.awt.GridBagConstraints gridBagConstraints;
backBtn = new javax.swing.JButton();
runBtn = new javax.swing.JButton();
headerTf = new javax.swing.JTextField();
addBtn = new javax.swing.JButton();
jScrollPane2 = new javax.swing.JScrollPane();
mainPanel = new javax.swing.JPanel();
detailsButton = new javax.swing.JButton();
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
java.awt.GridBagLayout layout = new java.awt.GridBagLayout();
layout.columnWidths = new int[] {0, 6, 0, 6, 0, 6, 0, 6, 0};
layout.rowHeights = new int[] {0, 15, 0};
getContentPane().setLayout(layout);
backBtn.setText("Back");
backBtn.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
backBtnActionPerformed(evt);
}
});
gridBagConstraints = new java.awt.GridBagConstraints();
gridBagConstraints.gridx = 0;
gridBagConstraints.gridy = 0;
getContentPane().add(backBtn, gridBagConstraints);
runBtn.setText("Run");
runBtn.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
runBtnActionPerformed(evt);
}
});
gridBagConstraints = new java.awt.GridBagConstraints();
gridBagConstraints.gridx = 2;
gridBagConstraints.gridy = 0;
getContentPane().add(runBtn, gridBagConstraints);
headerTf.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
headerTfActionPerformed(evt);
}
});
gridBagConstraints = new java.awt.GridBagConstraints();
gridBagConstraints.gridx = 4;
gridBagConstraints.gridy = 0;
gridBagConstraints.fill = java.awt.GridBagConstraints.HORIZONTAL;
gridBagConstraints.ipadx = 500;
gridBagConstraints.weightx = 1.0;
getContentPane().add(headerTf, gridBagConstraints);
addBtn.setText("Add");
addBtn.addMouseListener(new java.awt.event.MouseAdapter() {
public void mouseClicked(java.awt.event.MouseEvent evt) {
addBtnMouseClicked(evt);
}
});
gridBagConstraints = new java.awt.GridBagConstraints();
gridBagConstraints.gridx = 8;
gridBagConstraints.gridy = 0;
gridBagConstraints.anchor = java.awt.GridBagConstraints.LINE_END;
gridBagConstraints.insets = new java.awt.Insets(0, 0, 0, 10);
getContentPane().add(addBtn, gridBagConstraints);
javax.swing.GroupLayout mainPanelLayout = new javax.swing.GroupLayout(mainPanel);
mainPanel.setLayout(mainPanelLayout);
mainPanelLayout.setHorizontalGroup(
mainPanelLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGap(0, 889, Short.MAX_VALUE)
);
mainPanelLayout.setVerticalGroup(
mainPanelLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGap(0, 506, Short.MAX_VALUE)
);
jScrollPane2.setViewportView(mainPanel);
gridBagConstraints = new java.awt.GridBagConstraints();
gridBagConstraints.gridx = 0;
gridBagConstraints.gridy = 2;
gridBagConstraints.gridwidth = java.awt.GridBagConstraints.REMAINDER;
gridBagConstraints.gridheight = java.awt.GridBagConstraints.REMAINDER;
gridBagConstraints.fill = java.awt.GridBagConstraints.BOTH;
gridBagConstraints.ipadx = 7;
gridBagConstraints.ipady = 200;
gridBagConstraints.weightx = 1.0;
gridBagConstraints.weighty = 1.0;
gridBagConstraints.insets = new java.awt.Insets(0, 0, 0, 10);
getContentPane().add(jScrollPane2, gridBagConstraints);
detailsButton.setText("Details");
detailsButton.addMouseListener(new java.awt.event.MouseAdapter() {
public void mouseClicked(java.awt.event.MouseEvent evt) {
detailsButtonMouseClicked(evt);
}
});
gridBagConstraints = new java.awt.GridBagConstraints();
gridBagConstraints.gridx = 6;
gridBagConstraints.gridy = 0;
getContentPane().add(detailsButton, gridBagConstraints);
pack();
}// </editor-fold>
private void addBtnMouseClicked(java.awt.event.MouseEvent evt) {
if (currentlySelected == null) {
System.out.println("Adding Test Suite.");
TestSuite ts = new TestSuite("Name Please");
testSuites.add(ts);
TestCommonButton tcb = new TestCommonButton(ts);
mainPanel.add(tcb);
new TestCommonsDetailsForm(ts).setVisible(true);
} else {
System.out.println("Attempting to add Test level" + (currentlySelected.getDepth() + 1));
}
}
private void initTestSuites() {
clearFrameButtons();
headerTf.setText("Test Suites");
headerTf.setEditable(false);
int leftBound = ModelConstants.INIT_LEFT; //some padding
int upperBound = ModelConstants.INIT_TOP; //some padding
boolean top = true;
for (TestSuite tc : testSuites) {
TestCommonButton jb = new TestCommonButton(tc, tc.name);
jb.addMouseListener(new java.awt.event.MouseAdapter() {
public void mouseClicked(java.awt.event.MouseEvent evt) {
TestSuiteButtonMouseClicked(evt);
}
});
mainPanel.add(jb);
this.testCommonsButtons.add(jb);
jb.setBounds(leftBound, upperBound, ModelConstants.TEST_SUITE_WIDTH, ModelConstants.TEST_SUITE_HEIGHT);
if (top) {//we put button to top row, now put one below.
upperBound += ModelConstants.TEST_SUITE_HEIGHT + ModelConstants.Y_MARGIN_BETWEEN_TESTS;
}
if (!top) {//we put button to bottom row. Return to top row and shift right.
upperBound = ModelConstants.INIT_TOP;
leftBound += ModelConstants.TEST_SUITE_WIDTH + ModelConstants.X_MARGIN_BETWEEN_TESTS;
}
top = !top;
}
revalidate();
repaint();
}
/**
* @param args the command line arguments
*/
public static void main(String args[]) {
/* Set the Metal look and feel */
//<editor-fold defaultstate="collapsed" desc=" Look and feel setting code (optional) ">
/* If Metal (introduced in Java SE 6) is not available, stay with the default look and feel.
* For details see http://download.oracle.com/javase/tutorial/uiswing/lookandfeel/plaf.html
*/
try {
for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) {
if ("Metal".equals(info.getName())) {
javax.swing.UIManager.setLookAndFeel(info.getClassName());
break;
}
}
} catch (ClassNotFoundException ex) {
java.util.logging.Logger.getLogger(MainFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (InstantiationException ex) {
java.util.logging.Logger.getLogger(MainFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (IllegalAccessException ex) {
java.util.logging.Logger.getLogger(MainFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (javax.swing.UnsupportedLookAndFeelException ex) {
java.util.logging.Logger.getLogger(MainFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
}
//</editor-fold>
MainFrame frame = new MainFrame();
//Load TestSuites
//TestingPurposes, replace with parser later.
List<TestSuite> tss = new ArrayList();
for (int i = 0; i < 10; i++) {
tss.add(new TestSuite("Example#" + i));
}
//---------
for (TestSuite ts : tss) {
frame.testSuites.add(ts);
}
frame.initTestSuites();
/* Create and display the form */
java.awt.EventQueue.invokeLater(() -> {
frame.setVisible(true);
});
}
private List<TestCommonButton> testCommonsButtons = new ArrayList<>();
private List<TestSuite> testSuites = new ArrayList<>();
private TestCommons currentlySelected = null;
// Variables declaration - do not modify
private javax.swing.JButton addBtn;
private javax.swing.JButton backBtn;
private javax.swing.JButton detailsButton;
private javax.swing.JTextField headerTf;
private javax.swing.JScrollPane jScrollPane2;
private javax.swing.JPanel mainPanel;
private javax.swing.JButton runBtn;
// End of variables declaration
}
最佳答案
javax.swing.GroupLayout mainPanelLayout = new javax.swing.GroupLayout(mainPanel);
mainPanel.setLayout(mainPanelLayout);
您的mainPanel使用GroupLayout。 GroupLayout是最复杂的布局管理器之一，通常仅由IDE使用，因为它要求您设置垂直和水平约束。
在您的代码中使用：
mainPanel.add(tcb);
没有任何限制，因此布局管理器无法正常工作。
我从未使用过GroupLayout，因为约束对我来说太复杂了。因此，我建议您不要使用IDE生成表单。而是手动创建表单，以便您可以控制使用的布局管理器，然后可以根据需要使用适当的布局管理器（或使用不同布局管理器的嵌套面板）。
阅读有关Layout Managers的Swing教程中的部分，以获得更多信息和工作示例。
如果您想花时间学习如何使用GroupLayout，那么该教程确实提供了使用GroupLayout的示例。
关于java - Java Jscrollpane调整大小，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/49364388/