java JSeparator 不会与 GridBagLayout 一起显示
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JSeparator wont show with GridBagLayout
提问by Aly
I want to add a vertical JSeparator between two components using a GridBagLayout. The code I have is as follows:
我想使用 GridBagLayout 在两个组件之间添加一个垂直的 JSeparator。我的代码如下：
public MainWindowBody(){
setLayout(new GridBagLayout());
JPanel leftPanel = new InformationPanel();
JPanel rightPanel = new GameSelectionPanel();
JSeparator sep = new JSeparator(JSeparator.VERTICAL);
GridBagConstraints gbc = new GridBagConstraints();
gbc.gridx = 0;
gbc.gridy = 0;
gbc.anchor = GridBagConstraints.NORTH;
add(leftPanel,gbc);
gbc.gridx = 1;
gbc.gridy = 0;
gbc.fill = GridBagConstraints.VERTICAL;
add(sep,gbc);
gbc.gridx = 2;
gbc.gridy = 0;
gbc.fill = GridBagConstraints.NONE;
add(rightPanel,gbc);
}
But the JSeperator doesn't show, any ideas?
但是 JSeperator 没有显示，有什么想法吗？
Thanks
谢谢
回答by Thomas
You could try to set the preferred width for the separator:
您可以尝试为分隔符设置首选宽度：
sep.setPreferredSize(new Dimension(5,1));
Then, make GridBagLayout use up all available height for the separator:
然后，让 GridBagLayout 用完分隔符的所有可用高度：
gbc.fill = GridBagConstraints.VERTICAL;
gbc.weighty = 1;
回答by Hyman
Taken from Sun'sguide for JSeparator:
摘自Sun 的指南JSeparator：
In most implementations, a vertical separator has a preferred height of 0, and a horizontal separator has a preferred width of 0. This means a separator is not visible unless you either set its preferred size or put it in under the control of a layout manager such as BorderLayout or BoxLayout that stretches it to fill its available display area.
The vertical separator does have a bit of width (and the horizontal a bit of height), so you should see some space where the separator is. However, the actual dividing line isn't drawn unless the width and height are both non-zero.
在大多数实现中，垂直分隔符的首选高度为 0，水平分隔符的首选宽度为 0。这意味着分隔符不可见，除非您设置其首选大小或将其置于布局管理器的控制之下例如 BorderLayout 或 BoxLayout 将其拉伸以填充其可用显示区域。
垂直分隔符确实有一点宽度（而水平分隔符有一点高度），所以你应该看到分隔符所在的空间。但是，除非宽度和高度都非零，否则不会绘制实际的分界线。
Maybe you should set right constraints?
也许你应该设置正确的约束？
