根据列值更改 JTable 整行的背景颜色

Question

所以我想做的是根据最后一列中的值更改每一行的颜色。

我已经找到了这个解决方案：Change Background Color of JTable 效果很好。

但另外我想在第四列达到与第二列相同的值时将行的颜色切换为绿色。

我使用了 Cristian Marian 的方法并编写了我自己的方法 class

    @Override
public Component prepareRenderer(TableCellRenderer renderer, int row, int column) {
    Component comp = super.prepareRenderer(renderer, row, column);


        int second = (int) this.getModel().getValueAt(row, 1);
        int forth = (int) this.getModel().getValueAt(row, 3);
        int kat = Kategorie.getNumber((String) this.getModel().getValueAt(row, 2)); 
        if (kat > 0) {
            if (second == forth) {
                comp.setBackground(Color.GREEN);
            } else {
                comp.setBackground(Color.RED);
            }
        }

    return comp;
}

仍然只有每列中的最后一个单元格变为绿色，而不是整个单元格。但是当我在该行打卡时，整行都会切换颜色

最后一列中的值被另一帧更改。

Table开头：

当最后一列中的值与第二列中的值相同时，它看起来像这样：

达到给定值后：

Answer 1

您的方法存在问题，因为您使用了 getTableCellRendererComponent，因此只有该单元格的颜色会发生变化。

我不得不做类似的东西。根据列的值，我必须为该行着色。

我使用 class 扩展了 JTable 并覆盖了 prepareRenderer

@Override
public Component prepareRenderer(TableCellRenderer renderer, int row, int column) {
    Component comp = super.prepareRenderer(renderer, row, column);
    if (populated) {  //this if was just to make sure that I have data in my table
        /*
        *This piece makes the code ignore the rows that are selected as this approach messes up that blue color that selected rows get
        */
        int[] rows = this.getSelectedRows();
        boolean rowisSelected = false;

        for (int rowIndex : rows) {
            if (row == rowIndex) {
                rowisSelected = true;
                break;
            }
        }
        /*
        *And this is the part that does the coloring
        */
        if (!rowisSelected) {
            Integer status = Integer.parseInt((String) 
            int modelRow = convertRowIndexToModel(row);
            this.getModel().getValueAt(modelRow, Constants.HIDDEN_COLUMN));
            switch (status) {
            case 1:
                comp.setForeground(Color.BLACK);
                comp.setBackground(Color.WHITE);
                break;
            case 2:
                comp.setForeground(Color.LIGHT_GRAY);
                comp.setBackground(Color.WHITE);
                break;
            case 3:
                comp.setForeground(Color.BLACK);
                comp.setBackground(Constants.DOWNLOADED_COLOR);
                break;
            case 4:
                comp.setForeground(Color.LIGHT_GRAY);
                comp.setBackground(Constants.DOWNLOADED_COLOR);
                break;
            }
        }
    }
    return comp;
}

你的应该是这样的（没有选择行的东西）：

@Override
public Component prepareRenderer(TableCellRenderer renderer, int row, int column) {
    Component comp = super.prepareRenderer(renderer, row, column);
    int modelRow = convertRowIndexToModel(row);
    String second = this.getModel().getValueAt(modelRow, 1));
    String forth= this.getModel().getValueAt(modelRow, 3));
    if(second.equals(forth)){
        comp.setBackground(Color.GREEN);
    }
    return comp;
}

Answer 2

对于上述问题，我有另一种解决方案。在我的例子中，我有一个包含 10 列的 JTable。我只想根据输入的标记突出显示单元格行的某个子集。在下面附加的示例屏幕截图中，我输入了 Mark 167 并按下了 Find All 按钮。这样做时，单元格渲染器会突出显示单元格的一个子集。即，脚本编号、候选人、标记和等级为了实现这一点，我创建了一个单元格渲染器来扩展 DefaultCellRenderer。我已经删除了一些与问题无关的代码，因此它可能无法编译。尽管如此，您还是可以大致了解问题的解决方案：



import java.awt.Component;
import java.awt.Color;
import javax.swing.JTable;
import javax.swing.table.DefaultTableCellRenderer;

/*
 *
 * This class is the Color Renderer for the "Find All" Button.
 * It basically highlights all of the scripts with a certain color
 * This renderer is responsible Highlighting the JTable.
 * Based on the particular Mark that has been entered in the find all   
 * text field
 *
 *
 */

public class MarkSearchColorCellRenderer extends DefaultTableCellRenderer     
  implements ColorCellRenderer, GradeValidation
{
   public MarkSearchColorCellRenderer(int aMark, Color aColor)
   {
    the_Mark = aMark;
    theColor = aColor;
    }
    @Override
    public Component  getTableCellRendererComponent(JTable table, Object  
       value, boolean isSelected, boolean hasFocus, int row, int column)
    {

        Component cell = super.getTableCellRendererComponent(table,     
                            value, isSelected, hasFocus, row, column);

        setHorizontalAlignment(RIGHT);


        if ( column == 0 ) // script no column
        {
            //check the current Mark within this row
            //i.e. for this particular candidate
            Object curMark =  table.getValueAt(row, column+2);

            //highlight this cell a certain color if the
            //search mark has been found for this particular candidate
            highlightScripts(curMark, cell);
        }
        else if(column == 1) // Candidate No. Column
        {
            Object curMark =  table.getValueAt(row, column+1);

            highlightScripts(curMark, cell);
        }
        else if ( column == 2 ) // mark column
        {
             Object curMark = value;

             highlightScripts(curMark, cell);
        }
        else if (column == 3) // Grade Column
        {
             setHorizontalAlignment(LEFT);

             Object curMark =  table.getValueAt(row, column-1);

             highlightScripts(curMark, cell);
        }
        else if (column == 5) // script no column
        {
            Object curMark =  table.getValueAt(row, column+2);

            highlightScripts(curMark, cell);

        }
        else if( column == 6) // Candidate No. Column
        {
           Object curMark =  table.getValueAt(row, column+1);

           highlightScripts(curMark, cell);
        }
        else if ( column == 7) // mark column
        {
            Object curMark = value;

            highlightScripts(curMark, cell);

         }
         else if ( column == 8) // Grade Column
         {
            setHorizontalAlignment(LEFT);

             Object curMark =  table.getValueAt(row, column-1);

             highlightScripts(curMark, cell);

         }
         else
         {
             // Should never arrive here.
             // If it does, then you've rendered a column that may not
             // function with this class
             // therefore, I'm going to exit the program

              //System.exit(0);
         }

         table.repaint();

         return cell;

     } // end getTableCellRendererComponent()

     // Change the color of this cell if the aValue matches
     // the value within the particular cell
     private void highlightScripts(Object aValue, Component aCell)
     {
         Object value = aValue;
         Component cell = aCell;

         if ( value != null )
         {
             if (value instanceof Integer )
             {
                Integer amount = (Integer) value;

                if( amount.intValue() == the_Mark )
                {
                    cell.setBackground( theColor );

                 }
                 else
                 {
                     cell.setBackground( Color.white );

                 }
             }
         }
         else
         {
            cell.setBackground( Color.white );
         }
      }// end highlightScripts()

}//end class




       /*
        *
        * Inside the "Find All" button listener you would attach the 
        * MarkSearchColorCellRenderer to selected JTable columns. 
        * A snippet of the code is as follows:
        *
        */

        // select a color
        Color myMarkColor = new Color(226,182,90);

        // the mark to search
        Integer markToSearch = 
           new Integer(find_mark_jTextField.getText());

        //an instance of the class MarkSearchColorCellRenderer (outlined above)
        MarkSearchColorCellRenderer my_MarkSearch_CellRenderer = 
        new MarkSearchColorCellRenderer(
                            markToSearch.intValue(),myMarkColor);


        /*
        *
        * Get the all the Table columns of the JTable on which you wish to assign
        * the particular cell renderer. In my example I have 8 table column's
        * that I wish to assign the cell renderer 
        * i.e. Script, Candidate, Mark, Grade Script, Candidate, Mark, Grade 
        *
        * On looking at the screenshot I've ignored the monitor column (check box)
        */
        TableColumn script_column_100_A = first_100_Table.getColumnModel().getColumn(0);
        TableColumn candidate_column_100_A = first_100_Table.getColumnModel().getColumn(1);
        TableColumn mark_column_100_A =  first_100_Table.getColumnModel().getColumn(2);
        TableColumn grade_column_100_A =  first_100_Table.getColumnModel().getColumn(3);

        TableColumn script_column_100_B = first_100_Table.getColumnModel().getColumn(5);
        TableColumn candidate_column_100_B = first_100_Table.getColumnModel().getColumn(6);
        TableColumn mark_column_100_B =  first_100_Table.getColumnModel().getColumn(7);
        TableColumn grade_column_100_B =  first_100_Table.getColumnModel().getColumn(8);

        /*
        *
        * assign the MarkSearchColorCellRenderer to each of the choosen table column's.
        *
        * i.e. Script, Candidate, Mark, Grade Script, Candidate, Mark, Grade 
        *
        */
        script_column_100_A.setCellRenderer(my_MarkSearch_CellRenderer );
        script_column_100_A.setCellRenderer(my_MarkSearch_CellRenderer );
        candidate_column_100_A.setCellRenderer(my_MarkSearch_CellRenderer );
        mark_column_100_A.setCellRenderer(my_MarkSearch_CellRenderer );
        grade_column_100_A.setCellRenderer(my_MarkSearch_CellRenderer );
        script_column_100_B.setCellRenderer(my_MarkSearch_CellRenderer );
        candidate_column_100_B.setCellRenderer(my_MarkSearch_CellRenderer );
        mark_column_100_B.setCellRenderer(my_MarkSearch_CellRenderer );
        grade_column_100_B.setCellRenderer(my_MarkSearch_CellRenderer );


        this.repaint();

根据列值更改 JTable 整行的背景颜色

Change background color of JTable whole row based on column value

java

swing

jtable

tablecellrenderer