我在组布局中有一个 JLabel。 JLabel 填充有 HTML 文本，因此当文本对于一行来说太长时它会自动换行。
如果 JLabel 已经显示两行并且我在 JLabel 上设置新文本也将导致两行，则 JLabel 的大小会暂时更改，然后恢复到与之前相同的大小。这种临时的尺寸变化会导致周围元素出现不必要的可见偏移。
有没有办法阻止这种临时的尺寸变化，使显示不移动？
我查看了最小/最大/首选尺寸，但在设置尺寸之前，所有 3 个的高度都相同，因此设置最大值似乎没有帮助。
示例如下所示。运行示例 1)运行它。 2) 将列表滚动到最底部，以便在列表中显示 20。 3) 单击按钮。 列表的底部现在将显示 19，因为标签改变了大小，即使标签不需要改变大小，列表也改变了大小。
import java.util.Date;
public class LabelSizeTest extends javax.swing.JFrame {
public LabelSizeTest() {
initComponents();
}
private void initComponents() {
lblTest = new javax.swing.JLabel();
btnTest = new javax.swing.JButton();
jScrollPane1 = new javax.swing.JScrollPane();
jList1 = new javax.swing.JList();
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
lblTest.setText("<html>test asd asdf asdf asdf asdf asdf asdf asdf asdf end");
lblTest.setName("lblTest"); // NOI18N
btnTest.setText("Click Me");
btnTest.setName("btnTest"); // NOI18N
btnTest.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
btnTestActionPerformed(evt);
}
});
jScrollPane1.setName("jScrollPane1"); // NOI18N
jList1.setModel(new javax.swing.AbstractListModel() {
String[] strings = { "1", "2", "3", "4", "5", "6", "7", "8", "9", "10", "11", "12", "13", "14", "15", "16", "17", "18", "19", "20" };
public int getSize() { return strings.length; }
public Object getElementAt(int i) { return strings[i]; }
});
jList1.setName("jList1"); // NOI18N
jScrollPane1.setViewportView(jList1);
javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
getContentPane().setLayout(layout);
layout.setHorizontalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addContainerGap()
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(lblTest, javax.swing.GroupLayout.PREFERRED_SIZE, 0, Short.MAX_VALUE)
.addGroup(layout.createSequentialGroup()
.addComponent(btnTest)
.addGap(0, 165, Short.MAX_VALUE))
.addComponent(jScrollPane1))
.addContainerGap())
);
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addContainerGap()
.addComponent(jScrollPane1, javax.swing.GroupLayout.DEFAULT_SIZE, 219, Short.MAX_VALUE)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(lblTest, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(btnTest)
.addContainerGap())
);
pack();
}
private void btnTestActionPerformed(java.awt.event.ActionEvent evt) {
lblTest.setText(lblTest.getText() + "x");
}
public static void main(String args[]) {
java.awt.EventQueue.invokeLater(new Runnable() {
public void run() {
new LabelSizeTest().setVisible(true);
}
});
}
private javax.swing.JButton btnTest;
private javax.swing.JList jList1;
private javax.swing.JScrollPane jScrollPane1;
private javax.swing.JLabel lblTest;
}
最佳答案
我对你的代码做了两处修改:(你可以使用其中的任何一处) 第一:HTML 文本
<html><body style='width:200 px'>test asd asdf asdf asdf asdf asdf asdf asdf asdf end
第二:设置Jlabel的setPreferredSize
Dimension D = lblTest.getSize();
lblTest.setPreferredSize(D);
检查下面的完整工作代码:(第一个更改在这里实现，第二个更改被注释掉)
import java.awt.BorderLayout;
import java.awt.Dimension;
import java.awt.EventQueue;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.border.EmptyBorder;
import javax.swing.InputVerifier;
import javax.swing.JComponent;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JScrollBar;
import javax.swing.JTextField;
import java.util.Date;
public class LabelSizeTest extends javax.swing.JFrame {
JScrollBar vertical;
public LabelSizeTest() {
initComponents();
}
private void initComponents() {
lblTest = new javax.swing.JLabel();
btnTest = new javax.swing.JButton();
jScrollPane1 = new javax.swing.JScrollPane();
jList1 = new javax.swing.JList();
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
lblTest.setText("<html><body style='width:200 px'>test asd asdf asdf asdf asdf asdf asdf asdf asdf end");
lblTest.setName("lblTest"); // NOI18N
btnTest.setText("Click Me");
btnTest.setName("btnTest"); // NOI18N
btnTest.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
btnTestActionPerformed(evt);
}
});
jScrollPane1.setName("jScrollPane1"); // NOI18N
vertical = jScrollPane1.getVerticalScrollBar();
jList1.setModel(new javax.swing.AbstractListModel() {
String[] strings = { "1", "2", "3", "4", "5", "6", "7", "8", "9", "10", "11", "12", "13", "14", "15", "16", "17", "18", "19", "20" };
public int getSize() { return strings.length; }
public Object getElementAt(int i) { return strings[i]; }
});
jList1.setName("jList1"); // NOI18N
jScrollPane1.setViewportView(jList1);
javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
getContentPane().setLayout(layout);
layout.setHorizontalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addContainerGap()
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(lblTest, javax.swing.GroupLayout.PREFERRED_SIZE, 0, Short.MAX_VALUE)
.addGroup(layout.createSequentialGroup()
.addComponent(btnTest)
.addGap(0, 165, Short.MAX_VALUE))
.addComponent(jScrollPane1))
.addContainerGap())
);
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addContainerGap()
.addComponent(jScrollPane1, javax.swing.GroupLayout.DEFAULT_SIZE, 219, Short.MAX_VALUE)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(lblTest, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(btnTest)
.addContainerGap())
);
pack();
//Dimension D = lblTest.getSize();
//System.out.println(D);
//lblTest.setPreferredSize(D);
}
private void btnTestActionPerformed(java.awt.event.ActionEvent evt) {
lblTest.setText(lblTest.getText() + "x dsfsd sdfsdf dfgdfg dfgdfg dfgdfg dgfdgf dfgfg fgdfgf fgdg");
vertical.setValue( vertical.getMaximum());
pack();
}
public static void main(String args[]) {
java.awt.EventQueue.invokeLater(new Runnable() {
public void run() {
new LabelSizeTest().setVisible(true);
}
});
}
private javax.swing.JButton btnTest;
private javax.swing.JList jList1;
private javax.swing.JScrollPane jScrollPane1;
private javax.swing.JLabel lblTest;
}
关于java - 组布局中的 JLabel - 卡住大小，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/23811340/