在jTable中设置jCheckBox不可见

时间:2012-07-04 11:45:10

标签: java swing netbeans jtable tablecellrenderer

我有一个jTable有两列。第一列设置为布尔值(用于复选框),第二列设置为字符串值。当我使用Netbeans时,复选框被添加到第一行的所有行中柱。我试图只为那些在第二列中有值的行添加它。我使用代码来尝试,

private class CustomCellRenderer extends DefaultTableCellRenderer {

  /* (non-Javadoc)
   * @see javax.swing.table.DefaultTableCellRenderer#getTableCellRendererComponent(javax.swing.JTable, java.lang.Object, boolean, boolean, int, int)
   */

        @Override
  public Component  getTableCellRendererComponent(JTable table, Object value,boolean        isSelected, boolean hasFocus, int row, int column) {

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

             for(int i=row;i<jTable1.getRowCount();i++){

                if(jTable1.getValueAt(i, 1)==null){
                   jTable1.setValueAt(true, i, 0);
                    //checkbox.setOpaque(false);


                }
            }

        return this ;
  }

 }

如果我尝试为上面的for循环中的所有其他复选框设置值'true',那么它运行良好。如何将其设置为其余行不可见。

修改

我在此

中添加了我的代码
   package e2;

    import java.awt.Component;
    import javax.swing.JCheckBox;
    import javax.swing.JTable;
    import javax.swing.table.TableCellRenderer;
    public class JTable_CheckBox extends javax.swing.JFrame {

        /** Creates new form JTable_CheckBox */

        JCheckBox checkbox=new JCheckBox();

        public JTable_CheckBox() {
            initComponents();
               jTable1.setValueAt("John",0,1);
               jTable1.setValueAt("James",1,1);
               jTable1.setValueAt("Janet",2,1);
               jTable1.setValueAt("Tom",3,1);

    jTable1.getColumnModel().getColumn(0).setCellRenderer(new CheckboxCellRenderer());
        }


     public static void main(String args[]) {
            java.awt.EventQueue.invokeLater(new Runnable() {
                public void run() {
                    new JTable_CheckBox().setVisible(true);
                }
            });
        }

        public class CheckboxCellRenderer extends JCheckBox implements TableCellRenderer {

        public CheckboxCellRenderer() {
            setOpaque(false);
        }

        @Override
        public Component getTableCellRendererComponent(JTable table, Object value, boolean isSelected, boolean hasFocus, int row, int column) {
                //here i am trying to set check box invisible,but here i am setting as selected

           for(int i=row;i<table.getRowCount();i++){

                    if(table.getValueAt(i, 1)==null){
                       table.setValueAt(true, i, 0);
                        //checkbox.setOpaque(false);

                    }
                }
            return this;
            }

        }
     // Variables declaration - do not modify
        private javax.swing.JScrollPane jScrollPane1;
        private javax.swing.JTable jTable1;
        // End of variables declaration

    }

4 个答案:

答案 0 :(得分:4)

首先,必须了解渲染器/编辑器机制。要实现这一点,请阅读f.i. Swing tag description中引用的在线教程中的相应章节。

其次,为获得最佳视觉效果,请通过重复使用JTable本身安装的默认值来实现自定义渲染器,如:

public class CompoundRenderer implements TableCellRenderer {

    TableCellRenderer booleanRenderer;
    TableCellRenderer defaultRenderer;

    public CompoundRenderer(TableCellRenderer booleanRenderer, 
        TableCellRenderer defaultRenderer) {
        this.booleanRenderer = booleanRenderer;
        this.defaultRenderer = defaultRenderer;
    }
    @Override
    public Component getTableCellRendererComponent(..., Object value, ....) {
        if (value instanceof Boolean) {
            return booleanRenderer.getTableCellRendererComponent(...);
        }
        return defaultRenderer.getTableCellRendererComponent(...);
    }
}

// usage
JTable myTable ...
TableCellRenderer compound = new CompoundRenderer(
       myTable.getDefaultRenderer(Boolean.class), myTable.getDefaultRenderer(Object.class));
// either register for all booleans
myTable.setDefaultRenderer(Boolean.class, compound);
// or register for a particular column
myTable.getColumnModel().getColumn(someIndex).setCellRenderer(compound); 

答案 1 :(得分:2)

TableCellRenderer在表中用于绘制重用相同组件的表的各个单元格。该表自动设置正确的上下文,组件边界并为需要绘制的表的每个单元调用getTableCellRendererComponent(第一次显示表时,所有可见单元格都被绘制,然后在TableModel通知之后,适当的细胞重新粉刷。)

因此,在TableCellRenderer中,您当然不需要遍历表的单元格来尝试设置值。这没有意义。请记住,您正在实施具有您需要尊重的合同的接口TableCellRender

来自Javadoc:

  

返回用于绘制单元格的组件。使用此方法   在绘制之前适当配置渲染器。

所以你需要做的就是正确返回一个代表value参数的组件。可能,您可以修改组件以指示单元格是否具有焦点,以及当前是否选择了单元格。没什么,没什么。

现在,提出您的问题:如果您只想为具有值的行显示一个复选框,请执行TableCellRenderer,返回一个复选框,并根据第1列(第二列)中的值修改其可见性。

这个例子正在运作:

import java.awt.BorderLayout;
import java.awt.Component;
import java.awt.FlowLayout;
import java.beans.PropertyChangeEvent;
import java.beans.PropertyChangeListener;
import java.beans.PropertyChangeSupport;
import java.util.ArrayList;
import java.util.List;

import javax.swing.JCheckBox;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.SwingUtilities;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;
import javax.swing.table.AbstractTableModel;
import javax.swing.table.TableCellRenderer;

public class TestTable {

    public class CheckboxCellRenderer extends JPanel implements TableCellRenderer {

        private JCheckBox checkBox;

        public CheckboxCellRenderer() {
            super(new FlowLayout(FlowLayout.CENTER, 0, 0));
            setOpaque(false);
            checkBox = new JCheckBox();
            checkBox.setOpaque(false);
            checkBox.setHorizontalAlignment(JCheckBox.CENTER);
            add(checkBox);
        }

        @Override
        public Component getTableCellRendererComponent(JTable table, Object value, boolean isSelected, boolean hasFocus, int row, int column) {
            Object valueInColumn1 = table.getValueAt(row, 1);
            checkBox.setVisible(valueInColumn1 != null);
            checkBox.setSelected(value instanceof Boolean && (Boolean) value);
            return this;
        }
    }

    private JFrame f;
    private JTable table;

    private class MyObject {
        private PropertyChangeSupport propertyChangeSupport = new PropertyChangeSupport(this);

        private String value;

        private boolean selected;

        public MyObject(String value) {
            this.value = value;
        }

        public PropertyChangeSupport getPropertyChangeSupport() {
            return propertyChangeSupport;
        }

        public String getValue() {
            return value;
        }

        public void setValue(String value) {
            this.value = value;
            propertyChangeSupport.firePropertyChange("value", null, value);
        }

        public boolean isSelected() {
            return selected;
        }

        public void setSelected(boolean selected) {
            if (this.selected != selected) {
                this.selected = selected;
                propertyChangeSupport.firePropertyChange("selected", !selected, selected);
            }
        }

    }

    protected void initUI() {
        List<MyObject> objects = new ArrayList<TestTable.MyObject>();
        for (int i = 0; i < 200; i++) {
            MyObject object = new MyObject(i % 3 == 1 ? null : "Row " + (i + 1));
            objects.add(object);
        }
        table = new JTable(new MyTableModel(objects));
        table.setRowHeight(20);
        table.getColumnModel().getColumn(0).setCellRenderer(new CheckboxCellRenderer());
        f = new JFrame();
        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        f.add(new JScrollPane(table), BorderLayout.CENTER);
        f.pack();
        f.setVisible(true);

    }

    public class MyTableModel extends AbstractTableModel implements PropertyChangeListener {

        private List<MyObject> objects;

        public MyTableModel(List<MyObject> objects) {
            super();
            this.objects = objects;
            for (MyObject object : objects) {
                object.getPropertyChangeSupport().addPropertyChangeListener(this);
            }
        }

        @Override
        public void propertyChange(PropertyChangeEvent evt) {
            if (evt.getSource() instanceof MyObject) {
                int index = objects.indexOf(evt.getSource());
                fireTableRowsUpdated(index, index);
            }
        }

        @Override
        public int getColumnCount() {
            return 2;
        }

        @Override
        public int getRowCount() {
            return objects.size();
        }

        public MyObject getValueAt(int row) {
            return objects.get(row);
        }

        @Override
        public Object getValueAt(int rowIndex, int columnIndex) {
            switch (columnIndex) {
            case 0:
                return getValueAt(rowIndex).isSelected();
            case 1:
                return getValueAt(rowIndex).getValue();
            }
            return null;
        }

        @Override
        public void setValueAt(Object value, int rowIndex, int columnIndex) {
            if (columnIndex == 0) {
                getValueAt(rowIndex).setSelected(Boolean.TRUE.equals(value));
            }
        }

        @Override
        public boolean isCellEditable(int rowIndex, int columnIndex) {
            return columnIndex == 0 && getValueAt(rowIndex).getValue() != null;
        }

        @Override
        public Class<?> getColumnClass(int column) {
            switch (column) {
            case 0:
                return Boolean.class;
            case 1:
                return String.class;
            }
            return Object.class;
        }

        @Override
        public String getColumnName(int column) {
            switch (column) {
            case 0:
                return "Selected";
            case 1:
                return "Value";
            }
            return null;
        }

    }

    public static void main(String[] args) throws ClassNotFoundException, InstantiationException, IllegalAccessException,
            UnsupportedLookAndFeelException {
        UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
        SwingUtilities.invokeLater(new Runnable() {

            @Override
            public void run() {
                new TestTable().initUI();
            }
        });
    }

}

PS:我没有考虑isSelected / hasFocus,如果你想我们可以稍后再说。

答案 2 :(得分:1)

俗话说:很多方式都会导致罗马。

我遇到了类似的问题,即我有一个包含复选框的列的表,我想隐藏第一行中的复选框。在评估了其他解决方案后,我提出了一些略有不同的内容(适用于原始问题):

创建一个特定的CheckBoxRenderer类:

paramTable.getColumnModel().getColumn(3).setCellRenderer(new CheckBoxRenderer());

步骤2:将渲染器附加到te列:

<owl:NamedIndividual rdf:about="http://www.test123.com/test123-ontology.owl#cap_123">
<rdf:type rdf:resource="http://www.test123.com/test123-ontology.owl#HealthBeauty"/>
<description>Test test test</description>
<hasPrice rdf:datatype="http://www.w3.org/2001/XMLSchema#integer">49</hasPrice>
<id rdf:datatype="http://www.w3.org/2001/XMLSchema#integer">123</id>
</owl:NamedIndividual>

那就是它。

答案 3 :(得分:0)

我知道这是一个老线程,但我有类似的需求,并发现sers回答非常有帮助。我发现我需要包含的一个补充是创建一个CheckBoxEditor。否则,当我点击单元格时,我看到复选框暂时出现。所以我添加了这样的东西:

public class CheckBoxEditor extends DefaultCellEditor
{
   private JCheckBox checkBox = new JCheckBox();

   CheckBoxEditor()
   {
      super( checkBox );
   }

   @Override
   public Component getTableCellEditorComponent(
                       JTable  table,
                       Object  value,
                       boolean isSelected,
                       int     row,
                       int     column )
   {
      if ( row != 1 )
      {
         return super.getTableCellEditorComponent(
                        table, value, isSelected, row, column );
      }
      else
      {
         return null;
      }
   }
}

然后你会做类似的事情:

paramTable.getColumnModel().getColumn(3).setCellEditor( new CheckBoxEditor() );

无论如何,为我工作。

另一个注意事项是,如果您的单元格具有背景颜色,则可以通过添加以下行来扩展sers答案:

x.setOpaque( true );
x.setBackground( MYCOLOR );

将JLabel设置为opaque是关键,可以在类似主题的其他Stack Exchange答案中找到。