Question

我有一个属性AutoCreateRowSorter设置为true的JTable。它在点击时工作正常，但如果我在点击期间移动鼠标只是1px，则不会出现排序，这在某些情况下会让人感到不舒服。如何解决这个问题？

UPD我只想在鼠标释放时出现排序。

Answer 1

脏（读：如果你不是绝对绝望并且确切地知道你在做什么！）的方法是挂钩到由uiDelegate安装的MouseListener并将sort触发器移入发布的方法。这涉及到

一个自定义MouseListener，它将除了单击之外的所有事件委托给最初安装并在传递已发布的
用自定义
每当LAF更改时更新替换（因为原始文件由ui控制）。这需要JTableHeader的子类化并在updateUI中进行连接

自定义侦听器：

public static class EventHook implements MouseListener {

    private JTableHeader header;
    private MouseListener delegate;

    public EventHook(JTableHeader header) {
        this.header = header;
        installHook();
    }

    protected void installHook() {
        MouseListener[] listeners = header.getMouseListeners();
        for (int i = 0; i < listeners.length; i++) {
            MouseListener l = listeners[i];
            if (l.getClass().getName().contains("TableHeaderUI")) {
                this.delegate = l;
                listeners[i] = this;
            }
            header.removeMouseListener(l);
        }
        for (MouseListener l : listeners) {
            header.addMouseListener(l);
        }
    }

    public void uninstallHook() {
        MouseListener[] listeners = header.getMouseListeners();
        for (int i = 0; i < listeners.length; i++) {
            MouseListener l = listeners[i];
            if (l == this) {
                listeners[i] = delegate;
            }
            header.removeMouseListener(l);
        }
        for (MouseListener l : listeners) {
            header.addMouseListener(l);
        }
    }

    @Override
    public void mouseReleased(MouseEvent e) {
        // sort before calling super
        sort(e);
        delegate.mouseReleased(e);
    }

    private void sort(MouseEvent e) {
        if (!header.isEnabled()) {
            return;
        }
        // do nothing if dragged
        if (header.getDraggedDistance() != 0) {
            return;
        }
        if (e.getClickCount() % 2 == 1 &&
                SwingUtilities.isLeftMouseButton(e)) {
            JTable table = header.getTable();
            RowSorter sorter;
            if (table != null && (sorter = table.getRowSorter()) != null) {
                int columnIndex = header.columnAtPoint(e.getPoint());
                if (columnIndex != -1) {
                    columnIndex = table.convertColumnIndexToModel(
                            columnIndex);
                    sorter.toggleSortOrder(columnIndex);
                }
            }
        }
    }

    @Override
    public void mouseClicked(MouseEvent e) {
        // swallow the clicked - want to trigger sort on released
    }

    @Override
    public void mousePressed(MouseEvent e) {
        delegate.mousePressed(e);
    }

    @Override
    public void mouseEntered(MouseEvent e) {
        delegate.mouseEntered(e);
    }

    @Override
    public void mouseExited(MouseEvent e) {
        delegate.mouseExited(e);
    }

}

子类JTableHeader

public static class MyTableHeader extends JTableHeader {
    private EventHook hook;
    public MyTableHeader(TableColumnModel model) {
        super(model);
    }
    @Override
    public void updateUI() {
        if (hook != null) {
            hook.uninstallHook();
            hook = null;
        }
        super.updateUI();
        hook = new EventHook(this);
    }

}

用法，子类JTable并覆盖createDefaultTableHeader或手动设置标题：

// either subclass
JTable table = new JTable(new AncientSwingTeam()) {

    @Override
    protected JTableHeader createDefaultTableHeader() {
        return new MyTableHeader(getColumnModel());
    }

};
table.setAutoCreateRowSorter(true);

鼠标释放时排序JTable

1 个答案: