java - 具有单元格选择和多个间隔选择的 JTable 显示不正确的选择

Question

我想要一个表格，人们可以在其中自由选择单元格。

为此，我使用了 ListSelectionModel.MULTIPLE_INTERVAL_SELECTION 和 table.setCellSelectionEnabled(true)。

我有两个问题:

• 方法table.addRowSelectionInterval不会选择任何单元格
• 如果选择 2 个 block ，则具有相同行和列的单元格也会被选中。例如选择 B2-D4，然后选择 F7。这还将选择 B7-D7 和 F2-F4。

这是重现这些问题的程序:

import java.awt.BorderLayout;
import javax.swing.*;

public class JTableCellSelection {
    public static void showDemo(JComponent demo, String title) {
        JFrame mainFrame = new JFrame();
        mainFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        mainFrame.setTitle(title);
        JPanel contentPanel = new JPanel(new BorderLayout());

        contentPanel.add(demo);

        mainFrame.add(contentPanel);
        mainFrame.pack();
        mainFrame.setVisible(true);
    }

    public static void main(String[] args) {
        JTable table = new JTable(10, 10);
        table.setSelectionMode(ListSelectionModel.MULTIPLE_INTERVAL_SELECTION);
        table.setCellSelectionEnabled(true);
        table.addRowSelectionInterval(6, 7); // Select 2 lines
        showDemo(new JScrollPane(table), "Select a block and some rows");
    }
}

感觉我必须自己检查选择，而不是依赖表格单元格渲染器的 isSelected 。

Answer 1

所以我在 JTable 中实现了它。

请注意，此解决方案有几个缺点:

• 您无法使用table.getListSelectionModel来选择行，您需要调用table.addRowSelectionInterval
• 尝试选择选定 block 旁边的另一列将取消选择行
• 我尚未测试列选择，但我猜测它不会起作用
• 选择方 block 时改变方向并不总是有效

但对于其余部分来说，它几乎满足了我的要求

/*
 * Copyright 2013 Japplis.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

import java.awt.Point;
import java.util.HashMap;
import java.util.Map;
import java.util.Set;
import java.util.TreeSet;
import javax.swing.JTable;
import javax.swing.table.TableModel;

/**
 * The JTable used to display data.
 * This class is only to fix bugs or improve existing functionalities.
 *
 * @author Anthony Goubard - Japplis
 */
public class SheetTable extends JTable {

    private Map<Integer, Set<Integer>> selectedCells = new HashMap<>();
    private Point firstExtendCell;

    public SheetTable(TableModel tableModel) {
        super(tableModel);
    }

    @Override
    public void changeSelection(int rowIndex, int columnIndex, boolean toggle, boolean extend) {
        if (toggle && isCellSelected(rowIndex, columnIndex) && !extend) {
            selectedCells.get(rowIndex).remove(columnIndex);
        } else {
            if (!toggle && !extend) {
                selectedCells.clear();
            }
            Set<Integer> selectedColumns = selectedCells.get(rowIndex);
            if (selectedColumns == null) {
                selectedColumns = new TreeSet<>();
                selectedCells.put(rowIndex, selectedColumns);
            }
            selectedColumns.add(columnIndex);
            if (!extend) {
                firstExtendCell = new Point(rowIndex, columnIndex);
            } else {
                for (int i = Math.min(firstExtendCell.x, rowIndex); i <= Math.max(firstExtendCell.x, rowIndex); i++) {
                    for (int j = Math.min(firstExtendCell.y, columnIndex); j <= Math.max(firstExtendCell.y, columnIndex); j++) {
                        selectedCells.get(i).add(j);
                    }
                }
            }
        }
        super.changeSelection(rowIndex, columnIndex, toggle, extend);
    }

    @Override
    public void addRowSelectionInterval(int index0, int index1) {
        for (int i = index0; i < index1; i++) {
            selectedCells.remove(i);
        }
        super.addRowSelectionInterval(index0, index1);
    }

    @Override
    public void removeRowSelectionInterval(int index0, int index1) {
        for (int i = index0; i < index1; i++) {
            selectedCells.remove(i);
        }
        super.removeRowSelectionInterval(index0, index1);
    }

    @Override
    public void selectAll() {
        selectedCells.clear();
        super.selectAll();
    }

    @Override
    public void clearSelection() {
        if (selectedCells != null) {
            selectedCells.clear();
        }
        super.clearSelection();
    }

    @Override
    public boolean isCellSelected(int row, int column) {
        if (!getSelectionModel().isSelectedIndex(row)) {
            return false;
        }
        if (getSelectionModel().isSelectedIndex(row) && selectedCells.get(row) == null) {
            return true;
        }
        return selectedCells.get(row).contains(column);
    }
}

最后一个版本位于Joeffice Mercurial 存储库 bitbucket.org