根据JTable中的第一列值着色特定行？ [英] Coloring particular rows according to the first column values in JTable?

问题描述

我正在尝试根据 JTable 中的第一列值为特定行着色，但下面的代码根据行的索引为行着色。我的表只有四列。第一列有ID号。我需要根据这些ID号对行进行着色。例如，如果第一个ID为0而第二个ID也为0，则它​​们都应为lightGray。请问有什么想法吗？

  table_1 = new JTable（）{
 public Component prepareRenderer（TableCellRenderer renderer，int Index_row， int Index_col）{
 Component comp = super.prepareRenderer（renderer，Index_row，Index_col）; 
 //偶数索引，选中或未选中
 if（Index_row％2 == 0&&！isCellSelected（Index_row，Index_col））{
 comp.setBackground（Color.lightGray） ; 
} else {
 comp.setBackground（Color.white）; 
} 
返回comp; 
} 
}; 
  

以下是现在的样子：

解决方案

您的渲染器根据传递给 prepareRenderer（）的行参数选择颜色。谓词行％2 == 0 选择交替行进行着色，如图所示。您的问题意味着您实际上希望以第0列的值为基础着色， ID 。为此你需要检查 getValueAt（row，0）的结果。

确切的表述取决于你的模特。使用此所述。

I'm trying to color particular rows according to the first column values in JTable, but the code below colors the rows according to the row's index. My table has simply four columns. The first column has ID numbers. I need to color the rows according to these ID numbers. For example, if the first ID is 0 and the second is also 0, both of them should be "lightGray". Any idea, please?

table_1 = new JTable(){
    public Component prepareRenderer(TableCellRenderer renderer,int Index_row, int Index_col) {
        Component comp = super.prepareRenderer(renderer,Index_row, Index_col);
            //even index, selected or not selected
            if (Index_row % 2==0  &&  !isCellSelected(Index_row, Index_col)) {
                comp.setBackground(Color.lightGray);
            } else {
                comp.setBackground(Color.white);
            }
            return comp;
        }
    };

Here is how it looks now:

解决方案

Your renderer is choosing the color based on the row parameter passed to prepareRenderer(). The predicate row % 2 == 0 selects alternating rows for shading, as shown in your picture. Your question implies that you actually want to base shading on the value of column zero, ID. For this you need to examine the result of the getValueAt(row, 0).

The exact formulation depends on your model. Using this example, the following renderer shades rows starting with the letter "T".

private JTable table = new JTable(dataModel) {

    @Override
    public Component prepareRenderer(TableCellRenderer renderer, int row, int col) {
        Component comp = super.prepareRenderer(renderer, row, col);
        int modelRow = convertRowIndexToModel(row);
        if (((String) dataModel.getValueAt(modelRow, 0)).startsWith("T")
            && !isCellSelected(row, col)) {
            comp.setBackground(Color.lightGray);
        } else {
            comp.setBackground(Color.white);
        }
        return comp;
    }
};

Addendum: @mKorbel helpfully comments on the need to convert between model and view coordinates when sorting is enabled, as discussed here.

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