JList:如何获得位于“之间"的LineBorder.细胞? [英] JList: How to get a LineBorder "between" cells?

问题描述

这是JList的示例.我知道如何为整个JList或包含JList的面板设置边框. 我的问题是，我们如何在单元格之间创建线条边界?

This is an example of a JList. I know how to set a border to the entire JList or the panel containing the JList. My question is that how can we create line borders between the cells?`

例如，在给定的图片中，第一个单元格和第二个单元格之间的线边框颜色为灰色，而所有其他单元格之间的边框线为白色.

For example in the given picture the color of the line border between the first cell and the second is grey, while there is a white colored line border between all the other cells.

请不要说这是JComboBo x或JTree(因为第二个元素及其两个子元素)；即使它不是JLis t，我也希望我的JList在cells之间具有相似的LineBorders.

Please don't say that this is a JComboBox or a JTree (because of the second element and its two children); even if it is not a JList, I want my JList to have similar LineBorders between the cells.

我的网络搜索将我带到

My web search led me to this interface. Its method getListCellRendererComponent takes arguments like E value, int index, boolean isSelected, boolean cellHasFocus, while I want the LineBorder to appear between all the cells no matter what index they have and whether they are selected or not etc.

-

边界在某些地方较粗，而在其他地方则很好.

The border is thicker in some places and fine in others.

推荐答案

您可以在ListCellRenderer的帮助下实现这一目标.这是简单的示例:

You can achive that with help of ListCellRenderer. Here is simple example:

import java.awt.Color;
import java.awt.Component;

import javax.swing.BorderFactory;
import javax.swing.DefaultListCellRenderer;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JList;
import javax.swing.ListCellRenderer;


public class TestFrame extends JFrame{

    public TestFrame(){
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        init();
        pack();
        setVisible(true);
    }

    private void init() {
        JList<String> list = new JList<>(new String[]{"1","2","3"});
        list.setCellRenderer(getRenderer());
        add(list);
    }

    private ListCellRenderer<? super String> getRenderer() {
        return new DefaultListCellRenderer(){
            @Override
            public Component getListCellRendererComponent(JList<?> list,
                    Object value, int index, boolean isSelected,
                    boolean cellHasFocus) {
                JLabel listCellRendererComponent = (JLabel) super.getListCellRendererComponent(list, value, index, isSelected,cellHasFocus);
                listCellRendererComponent.setBorder(BorderFactory.createMatteBorder(0, 0, 1, 0,Color.BLACK));
                return listCellRendererComponent;
            }
        };
    }

    public static void main(String... strings) {
        new TestFrame();
    }
}

看起来像:

在教程中了解更多.

只需将LineBorder更改为MatteBorder(已更改代码和图像).

Just change LineBorder to MatteBorder(have changed code and image).

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