如何在使用BorderFactory创建TitleBorder后从Panel中删除蓝线？

Question

我创建了一个JPanel，我添加了一个带有BorderFactory的TitleBorder，但它在面板周围显示了一条蓝线。 我想删除这一行。

有什么建议吗？

谢谢

Answer 1

• 从未尝试从TitleBorders AP我提取此值，方法受到保护，或使用UIManager

• 必须使用LineBorder inside TitleBorder

• 最简单的语法可以是xxx.setBorder(new TitledBorder(new LineBorder(Color.ORANGE, 1), "label"));，也可以从（例如）Color myPanel.getBackground()

的Color.ORANGE获取Font

• 其他选项（可能）

  1. 移动desciption（顶部，底部.....）

  2. 更改Foreground

  3. 更改Color（import java.awt.Color; import java.awt.Dimension; import java.awt.EventQueue; import java.awt.GridLayout; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import javax.swing.JButton; import javax.swing.JCheckBox; import javax.swing.JFrame; import javax.swing.JPanel; import javax.swing.border.LineBorder; import javax.swing.border.TitledBorder; public class AddComponentsAtRuntime { private JFrame f; private JPanel panel; private JCheckBox checkValidate, checkReValidate, checkRepaint, checkPack; public AddComponentsAtRuntime() { JButton b = new JButton(); b.setBackground(Color.red); b.setBorder(new LineBorder(Color.black, 2)); b.setPreferredSize(new Dimension(600, 10)); panel = new JPanel(new GridLayout(0, 1)); panel.add(b); panel.setBorder(new TitledBorder(new LineBorder(Color.ORANGE, 1), "Add Components At Runtime")); f = new JFrame(); f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); f.add(panel, "Center"); f.add(getCheckBoxPanel(), "South"); f.setLocation(200, 200); f.pack(); f.setVisible(true); } private JPanel getCheckBoxPanel() { checkValidate = new JCheckBox("validate"); checkValidate.setSelected(false); checkReValidate = new JCheckBox("revalidate"); checkReValidate.setSelected(false); checkRepaint = new JCheckBox("repaint"); checkRepaint.setSelected(false); checkPack = new JCheckBox("pack"); checkPack.setSelected(false); JButton addComp = new JButton("Add New One"); addComp.addActionListener(new ActionListener() { @Override public void actionPerformed(ActionEvent e) { JButton b = new JButton(); b.setBackground(Color.red); b.setBorder(new LineBorder(Color.black, 2)); b.setPreferredSize(new Dimension(600, 10)); panel.add(b); makeChange(); System.out.println(" Components Count after Adds :" + panel.getComponentCount()); } }); JButton removeComp = new JButton("Remove One"); removeComp.addActionListener(new ActionListener() { @Override public void actionPerformed(ActionEvent e) { int count = panel.getComponentCount(); if (count > 0) { panel.remove(0); } makeChange(); System.out.println(" Components Count after Removes :" + panel.getComponentCount()); } }); JPanel panel2 = new JPanel(); panel2.add(checkValidate); panel2.add(checkReValidate); panel2.add(checkRepaint); panel2.add(checkPack); panel2.add(addComp); panel2.add(removeComp); return panel2; } private void makeChange() { if (checkValidate.isSelected()) { panel.validate(); } if (checkReValidate.isSelected()) { panel.revalidate(); } if (checkRepaint.isSelected()) { panel.repaint(); } if (checkPack.isSelected()) { f.pack(); } } public static void main(String[] args) { EventQueue.invokeLater(new Runnable() { public void run() { AddComponentsAtRuntime makingChanges = new AddComponentsAtRuntime(); } }); } } 以获取说明）

• Oracle教程How to Use Borders（CompounBorders）中的更多选项和说明

例如

{{1}}

Answer 2

蓝线（金属中）是TitledBorder使用的默认边框（如果没有明确指定）。如果你不喜欢默认的f.i，你需要提供另一个边框。一个EmptyBorder：

myPanel.setBorder(BorderFactory.createTitledBorder
    (BorderFactory.createEmptyBorder(), someTitle));