java - 如何向带边框的 JPanel 添加填充

Question

我想给一些 JPanel 添加填充。我找到了这个答案:https://stackoverflow.com/a/5328475/1590323

它适用于没有边框的面板。但是对于已经有边框的面板我该怎么做呢？ (在本例中为 TitledBorder)

我试过:

JPanel mypanel = new MyPanel(); // Panel that I am going to add a TitledBorder to, but needs padding
mypanel.setBorder(new EmptyBorder(10,10,10,10));
JPanel mypanel_container = new JPanel();
TitledBorder border = BorderFactory.createTitledBorder(BorderFactory.createRaisedBevelBorder(), "My panel");
border.setTitleJustification(TitledBorder.LEADING);
mypanel_container.setBorder(border);
mypanel_container.add(mypanel);
this.add(mypanel_container);

(简而言之:将 EmptyBorder 添加到应该有 TitledBorder 的面板，然后使用 TitledBorder 创建另一个面板并添加第一个面板，然后使用那个面板)

但后来我得到了太大的填充，忽略了 EmptyBorder 的构造函数值。

那么如何向带有图形边框的 JPanel 添加填充？

Answer 1

可以看看CompoundBorder .

A composite Border class used to compose two Border objects into a single border by nesting an inside Border object within the insets of an outside Border object. For example, this class may be used to add blank margin space to a component with an existing decorative border:

Border border = comp.getBorder();
Border margin = new EmptyBorder(10,10,10,10);
comp.setBorder(new CompoundBorder(border, margin));

当然你也可以用BorderFactory#createCompoundBorder(border, margin) .