摆动依赖组件和事件系统

Question

我必须使用 Swing 在 JAVA 中构建一个复杂的 GUI(目前我有近 80 个类(。应用程序的图形部分拆分如下：第一个系列选项卡(例如"管理"，"管理"，"配置"(，然后是第二个级别(例如，"用户"，"组"，"游戏"(。目前，我有两个年级(每个级别的标签一个(。下一个级别是管理业务对象的 JPanel(我的整个 GUI 都是围绕我的业务模型构建的(，在这个级别有 2 种类型的 JPanel：谁管理简单对象(例如，"用户"、"类别"、"游戏"、"级别"(和那些管理对象的"复合主键"(例如"User_Game"，它代表所有用户每个游戏级别的复式表的形式(。我的第二级选项卡可以包含多个 JPanel。当我的 JPanel 管理单个对象时，它由一个 JTable 和两个按钮(添加和删除(组成，我在其中放置事件，如果不是，它是一个简单的 JTable。当我有外键(例如"组"代表"用户"和"类别"到"游戏"或"级别"到"User_Game"(，它是一个JComboBox，直接从JTableModel获取信息。当涉及到管理JTable对象以"复合主键"时，列和行也直接依赖于模型(例如"游戏"和"用户"User_Game"(。每个都有自己的JTable模型，用于处理持久性层(Hibernate以获取信息(和其他TableModel。为了管理更改(例如添加，修改或删除"用户"(，我使用以下代码：

import java.awt.event.*;
import javax.swing.*;
import java.beans.*;
/*
 *  This class listens for changes made to the data in the table via the
 *  TableCellEditor. When editing is started, the value of the cell is saved
 *  When editing is stopped the new value is saved. When the oold and new
 *  values are different, then the provided Action is invoked.
 *
 *  The source of the Action is a TableCellListener instance.
 */
public class TabCellListener implements PropertyChangeListener, Runnable
{
    private JTable table;
    private Action action;
    private int row;
    private int column;
    private Object oldValue;
    private Object newValue;
    /**
     *  Create a TableCellListener.
     *
     *  @param table   the table to be monitored for data changes
     *  @param action  the Action to invoke when cell data is changed
     */
    public TabCellListener(JTable table, Action action)
    {
        this.table = table;
        this.action = action;
        this.table.addPropertyChangeListener( this );
        this.table.getModel().addTableModelListener(new ModelListenerTableGui(this.table, this.action));
    }
    /**
     *  Create a TableCellListener with a copy of all the data relevant to
     *  the change of data for a given cell.
     *
     *  @param row  the row of the changed cell
     *  @param column  the column of the changed cell
     *  @param oldValue  the old data of the changed cell
     *  @param newValue  the new data of the changed cell
     */
    private CellListenerTableGui(JTable table, int row, int column, Object oldValue, Object newValue)
    {
        this.table = table;
        this.row = row;
        this.column = column;
        this.oldValue = oldValue;
        this.newValue = newValue;
    }
    /**
     *  Get the column that was last edited
     *
     *  @return the column that was edited
     */
    public int getColumn()
    {
        return column;
    }
    /**
     *  Get the new value in the cell
     *
     *  @return the new value in the cell
     */
    public Object getNewValue()
    {
        return newValue;
    }
    /**
     *  Get the old value of the cell
     *
     *  @return the old value of the cell
     */
    public Object getOldValue()
    {
        return oldValue;
    }
    /**
     *  Get the row that was last edited
     *
     *  @return the row that was edited
     */
    public int getRow()
    {
        return row;
    }
    /**
     *  Get the table of the cell that was changed
     *
     *  @return the table of the cell that was changed
     */
    public JTable getTable()
    {
        return table;
    }
//
//  Implement the PropertyChangeListener interface
//
    @Override
    public void propertyChange(PropertyChangeEvent e)
    {
        //  A cell has started/stopped editing
        if ("tableCellEditor".equals(e.getPropertyName()))
        {
            if (table.isEditing())
                processEditingStarted();
            else
                processEditingStopped();
        }
    }
    /*
     *  Save information of the cell about to be edited
     */
    private void processEditingStarted()
    {
        //  The invokeLater is necessary because the editing row and editing
        //  column of the table have not been set when the "tableCellEditor"
        //  PropertyChangeEvent is fired.
        //  This results in the "run" method being invoked
        SwingUtilities.invokeLater( this );
    }
    /*
     *  See above.
     */
    @Override
    public void run()
    {
        row = table.convertRowIndexToModel( table.getEditingRow() );
        column = table.convertColumnIndexToModel( table.getEditingColumn() );
        oldValue = table.getModel().getValueAt(row, column);
        newValue = null;
    }
    /*
     *  Update the Cell history when necessary
     */
    private void processEditingStopped()
    {
        newValue = table.getModel().getValueAt(row, column);
        //  The data has changed, invoke the supplied Action
        if ((newValue == null && oldValue != null) || (newValue != null && !newValue.equals(oldValue)))
        {
            //  Make a copy of the data in case another cell starts editing
            //  while processing this change
            CellListenerTableGui tcl = new CellListenerTableGui(
                getTable(), getRow(), getColumn(), getOldValue(), getNewValue());
            ActionEvent event = new ActionEvent(
                tcl,
                ActionEvent.ACTION_PERFORMED,
                "");
            action.actionPerformed(event);
        }
    }
}

以及以下操作：

import java.awt.event.ActionEvent;
import java.beans.PropertyChangeListener;
import javax.swing.Action;
public class UpdateTableListener<N> extends AbstractTableListener implements Action
{
    protected boolean enabled;
    public UpdateTableListener(AbstractTableGui<N> obs)
    {
        super(obs);
        this.enabled = true;
    }
    @Override
    public void actionPerformed(ActionEvent e)
    {
        if (null != e && e.getSource() instanceof CellListenerTableGui)
        {
            TabCellListener tcl = (TabCellListener)e.getSource();
            this.obs.getModel().setValueAt(tcl.getNewValue(), tcl.getRow(), tcl.getColumn());
            int sel = this.obs.getModel().getNextRequiredColumn(tcl.getRow());
            if (sel == -1)
                this.obs.getModel().save(tcl.getRow());
        }
    }
    @Override
    public void addPropertyChangeListener(PropertyChangeListener arg0)
    {
    }
    @Override
    public Object getValue(String arg0)
    {
        return null;
    }
    @Override
    public boolean isEnabled()
    {
        return this.enabled;
    }
    @Override
    public void putValue(String arg0, Object arg1)
    {
    }
    @Override
    public void removePropertyChangeListener(PropertyChangeListener arg0)
    {
    }
    @Override
    public void setEnabled(boolean arg0)
    {
        this.enabled = arg0;
    }
}

此代码运行良好，数据持久化良好。然后我添加以下代码以刷新依赖组件：

import java.awt.event.ActionEvent;
import java.beans.PropertyChangeListener;
import javax.swing.Action;
public class ChangeTableListener implements Action
{
    protected AbstractTableGui table;
    public ChangeTableListener(AbstractTableGui table)
    {
        this.table = table;
    }
    @Override
    public void actionPerformed(ActionEvent arg0)
    {
        this.table.getModel().fireTableDataChanged();
        this.table.repaint();
    }
    @Override
    public void addPropertyChangeListener(PropertyChangeListener arg0)
    {
    }
    @Override
    public Object getValue(String arg0)
    {
        return null;
    }
    @Override
    public boolean isEnabled()
    {
        return false;
    }
    @Override
    public void putValue(String arg0, Object arg1)
    {
    }
    @Override
    public void removePropertyChangeListener(PropertyChangeListener arg0)
    {
    }
    @Override
    public void setEnabled(boolean arg0)
    {
    }
}

My TableModel.fireTableDataChanged 重建 JTable 内容(calle super.fireTableDataChanged 和 fireTableStructureChanged(，JTable.repaint 重置渲染器，它适用于 Combobox(forein 键(，它更新了复式输入表上的井标题，但它不能添加或删除复式输入表上的列或行。此外，如果有最轻微的变化，我会看到更高的延迟。

我的问题很简单：您如何管理相互依赖的组件？

为了您的帮助，提前谢谢。

编辑：下面是 TableCellEditor 的示例。

import javax.swing.DefaultCellEditor;
import javax.swing.JTextField;
public class TextColumnEditor extends DefaultCellEditor
{
    public TextColumnEditor()
    {
        super(new JTextField());
    }
    public boolean stopCellEditing()
    {
        Object v = this.getCellEditorValue();
        if(v == null || v.toString().length() == 0)
        {
            this.fireEditingCanceled();
            return false;
        }
        return super.stopCellEditing();
    }
}

表格模型的示例：

import java.util.ArrayList;
public class GroupModelTable extends AbstractModelTable<Groups>
{
    protected GroupsService service;
    public GroupModelTable(AbstractTableGui<Groups> content)
    {
        super(content, new ArrayList<String>(), new ArrayList<Groups>());
        this.headers.add("Group");
        this.content.setModel(this);
        this.service = new GroupsService();
        this.setLines(this.service.search(new Groups()));
    }
    public Object getValueAt(int rowIndex, int columnIndex)
    {
        switch (columnIndex)
        {
            case 0:
                return this.lines.get(rowIndex).getTitle();
            default:
                return "";
        }
    }
    public void setValueAt(Object aVal, int rowIndex, int columnIndex)
    {
        switch (columnIndex)
        {
            case 0:
                this.lines.get(rowIndex).setTitle(aVal.toString());
                break;
            default:
                break;
        }
    }
     @Override
     public Groups getModel(int line, int column)
     {
         return null;
     }
     @Override
     public Groups getModel(int line)
     {
         return this.lines.get(line);
     }
     public boolean isCellEditable(int row, int column)
     {
        return true;
     }
    @Override
    public GroupModelTableGui newLine()
    {
        this.lines.add(new Groups());
        return this;
    }
    @Override
    public int getNextRequiredColumn(int row)
    {
        Groups g = this.getModel(row);
        if (g != null && g.getTitle() != null && g.getTitle().length() > 0)
            return -1;
        return 0;
    }
    @Override
    public void save(int row)
    {
        Groups g = this.getModel(row);
        if (g != null)
        {
            try
            {
                if (g.getId() == null)
                    this.service.create(g);
                else
                    this.service.update(g);
            }
            catch (Exception e)
            {
            }
        }
    }
    @Override
    public void removeRow(int row)
    {
        Groups g = this.getModel(row);
        if (g != null)
        {
            try
            {
                if (g.getId() != null)
                    this.service.delete(g);
                super.removeRow(row);
            }
            catch (Exception e)
            {
            }
        }
    }
}

表的示例：

public class GroupTable extends AbstractTable<Groups>
{
    public GroupTable()
    {
        new GroupModelTableGui(this);
        new CellListenerTableGui(this.getContent(), new UpdateTableListenerGui<Groups>(this));
        this.getContent().getColumnModel().getColumn(0).setCellEditor(new TextColumnEditorGui());
    }
}

我希望它能帮助您理解：/

Answer 1

你的TabCellListener对我来说很陌生。您的TableCellEditor不应直接与TableModel交互。它应该实现getTableCellEditorComponent()和getCellEditorValue()，如本例所示。当编辑器结束时，模型将具有新值。您的TableModel应处理持久性。多个视图可以通过 TableModelListener 侦听单个TableModel。

附录：TextColumnEditor，您的CellEditor可能不应该调用fireEditingCanceled()。按 Esc 应该足以还原编辑，如本例所示。您还可以查看相关的教程部分和示例。