java - 渲染器中未设置 RowSorter

Question

我在 jTable 中实现了用于排序列的图标。我有一个用于查找结果的按钮，并且在启动工作程序时实现了默认排序。像这样:

public void refreshStripedViewTable(final List<FlightBox> boxList,
        final List<FlightBoxModel> boxesModels, final String sortBy) {
        if (boxList != null && !boxList.isEmpty()) {
            stripedViewTableModel.setContent(boxesModels);
            tableRenderer.setStripedViewModelList(boxesModels);
            final RowSorter<? extends TableModel> sorter = tableFacade
                .getTooltipsTable().getRowSorter();
            if (sorter != null) {
                List<SortKey> sortKeys = new ArrayList<SortKey>();
                javax.swing.RowSorter.SortKey sk = new SortKey(getColumnIndex(
                    sortBy, tableFacade.getTooltipsTable()),
                    SortOrder.ASCENDING);
                sortKeys.add(sk);
                sorter.setSortKeys(sortKeys);
                tableFacade.getTooltipsTable().setRowSorter(sorter);
                tableFacade.getTooltipsTable().validate();
                tableFacade.getTooltipsTable().getModelTable()
                    .fireTableDataChanged();
            }
        }
    }

当用户单击 JTable 上的标题时，我为 setIcon 添加渲染器。

public Component getTableCellRendererComponent(final JTable table,
        final Object value, final boolean isSelected, final boolean hasFocus,
        final int row, final int column) {
        setIcon(null);
        super.getTableCellRendererComponent(table, value, isSelected, hasFocus,
            row, column);
        setOpaque(false);
        setForeground(Color.white);
        final RowSorter<?> sorter = table.getRowSorter();
        if (sorter != null) {
            java.util.List<? extends javax.swing.RowSorter.SortKey> sortKeys = sorter
                .getSortKeys();
            if (sortKeys.size() > 0) {
                javax.swing.RowSorter.SortKey sk = sortKeys.get(0);
                // take in account if the user moves the column
                if (column == table.convertColumnIndexToView(sk.getColumn())) {
                    Icon icon = null;
                    if (sk.getSortOrder() == SortOrder.ASCENDING) {
                        icon = iconService
                            .getRessourceIcon(MediaHmiService.TABLE_SORT_ORDER_ASCENDING);
                    } else if (sk.getSortOrder() == SortOrder.DESCENDING) {
                        icon = iconService
                            .getRessourceIcon(MediaHmiService.TABLE_SORT_ORDER_DESCENDING);
                    }
                    setIcon(icon);
                }
            }
        }
        setHorizontalTextPosition(SwingConstants.LEFT);
        return this;
    }

我这样做时遇到问题: - 找到的结果 --> 图标设置为默认列排序 OK - 单击标题设置图标确定 - 重新启动搜索 --> 图标不可见。KO我的渲染器没有 sortKeys，但我在方法中设置了 rowSorter freshStripedViewTable()。我不明白为什么......

谢谢大家的帮助。问候。

Answer 1

• 注意，SortOrder 共有三种类型

• 升序

• 降序

• 未排序

f.i.

import java.awt.Component;
import java.util.ArrayList;
import java.util.List;
import javax.swing.Icon;
import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.RowSorter;
import javax.swing.SortOrder;
import javax.swing.UIManager;
import javax.swing.table.TableCellRenderer;
import javax.swing.table.TableModel;
import javax.swing.table.TableRowSorter;

public class RowSorterDefaults {

    private static final long serialVersionUID = 1L;
    private JFrame frame = new JFrame();
    private JScrollPane pane = new javax.swing.JScrollPane();
    private JTable table = new javax.swing.JTable();

    public RowSorterDefaults() {
        table.setModel(new javax.swing.table.DefaultTableModel(
                new Object[][]{
                    {"a", "q", "h", "v"}, {"b", "m", "l", "h"},
                    {"d", "c", "a", "d"}, {"j", "o", "y", "e"}
                },
                new String[]{
                    "Col 1", "Col 2", "Col 3", "Col 4"
                }) {
            private static final long serialVersionUID = 1L;
            Class[] types = new Class[]{
                String.class, String.class, String.class, String.class
            };

            @Override
            public Class getColumnClass(int columnIndex) {
                return types[columnIndex];
            }
        });
        TableRowSorter<TableModel> sorter = new TableRowSorter<TableModel>(table.getModel()) {
            @Override
            public void toggleSortOrder(int column) {
                if (column >= 0 && column < getModelWrapper().getColumnCount() && isSortable(column)) {
                    List<SortKey> keys = new ArrayList<SortKey>(getSortKeys());
                    if (!keys.isEmpty()) {
                        SortKey sortKey = keys.get(0);
                        if (sortKey.getColumn()
                                == column && sortKey.getSortOrder()
                                == SortOrder.DESCENDING) {//UNSORTED, ASCENDING
                            setSortKeys(null);
                            return;
                        }
                    }
                }
                super.toggleSortOrder(column);
            }
        };
        table.setRowSorter(sorter);
        table.setPreferredScrollableViewportSize(table.getPreferredSize());
        table.setDefaultRenderer(RowSorterDefaults.class, new HeaderRenderer(table));
        pane.setViewportView(table);
        frame.setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
        frame.add(pane);
        frame.pack();
        frame.setVisible(true);
    }

    class HeaderRenderer implements TableCellRenderer {

        final TableCellRenderer renderer;

        public HeaderRenderer(JTable table) {
            renderer = table.getTableHeader().getDefaultRenderer();
        }

        @Override
        public Component getTableCellRendererComponent(
                JTable table, Object value, boolean isSelected,
                boolean hasFocus, int row, int col) {
            return renderer.getTableCellRendererComponent(
                    table, value, isSelected, hasFocus, row, col);
        }

        public Icon getIcon(JTable table, int column) {
            for (RowSorter.SortKey sortKey : table.getRowSorter().getSortKeys()) {
                if (sortKey.getColumn() == column) {
                    switch (sortKey.getSortOrder()) {
                        case ASCENDING:
                            return (UIManager.getIcon("Table.ascendingSortIcon"));
                        case DESCENDING:
                            return (UIManager.getIcon("Table.descendingSortIcon"));
                    }
                }
            }
            return null;
        }
    }

    public static void main(String args[]) {
        java.awt.EventQueue.invokeLater(new Runnable() {
            @Override
            public void run() {
                new RowSorterDefaults();
            }
        });
    }
}