为什么我的Java自定义单元格渲染器在选择行/单元格时不显示高亮显示？ [英] Why does my Java custom cell renderer not show highlighting when the row/cell is selected?

问题描述

我有一个自定义单元格渲染器，用于单元格进行自动换行，以便可以读取更多内容。以下是代码：

I have a custom cell renderer for a cell to do a word wrap so more content can be read. Here is the code:

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

import javax.swing.JTable;
import javax.swing.JTextArea;
import javax.swing.table.TableCellRenderer;

public class TextWrapCellRenderer extends JTextArea implements TableCellRenderer {
    private static final long serialVersionUID = 1L;

    public TextWrapCellRenderer() {
        setLineWrap(true);
        setWrapStyleWord(true);
        setMargin(new Insets(0, 5, 0, 5));
        setSelectionColor(Color.GREEN);
    }

    public Component getTableCellRendererComponent(JTable table, Object value, boolean isSelected, boolean hasFocus, int row, int column) {
        setText((String)value);
        setSize(table.getColumnModel().getColumn(column).getWidth(),getPreferredSize().height);
        setSelectionColor(Color.GREEN);

        return this;
    }
}

更新：单元格正确使用渲染器但是当用户在JTable中选择一行时，它仅显示非自定义渲染单元格的突出显示。突出显示该行的所有其他单元格。这只留下一个带有白色背景的单元格，而行的其余部分则为蓝色（在我的情况下）作为突出显示的背景颜色。

Update: The cell renderer is used properly but when the user selects a row in the JTable, then it only shows the highlighting for the non-custom rendered cells. The highlighting shows for all other cells for that row though. This leaves just one cell with a white background while the rest of the row has blue (in my case) as the highlighted background color.

推荐答案

您必须检查 isSelected 参数以查看是否选择了单元格，例如：

You have to check the isSelected argument to see if the cell is selected or not, something like:

public Component getTableCellRendererComponent(JTable table, Object value, boolean isSelected, boolean hasFocus, int row, int column) 
{
        setText((String)value);
        setSize(table.getColumnModel().getColumn(column).getWidth(),getPreferredSize().height);
        setSelectionColor(Color.GREEN);

        if (isSelected)
        {
            setBackground(table.getSelectionBackground());
            setForeground(table.getSelectionForeground());
        }
        else
        {
            setBackground(table.getBackground());
            setForeground(table.getForeground());
        }
        return this;
    }

这篇关于为什么我的Java自定义单元格渲染器在选择行/单元格时不显示高亮显示？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！