Swing JComboBox实现键值

来源：互联网发布：黄金比例身高算法编辑：程序博客网时间：2024/05/16 19:38

之前用Swing写一个辅助工具项目,发现Swing的JComboBox竟然不能直接支持键值对的形式,很郁闷.

最好自己只能扩展JComboBox.

import java.awt.Component;import java.util.Vector;import javax.swing.DefaultComboBoxModel;import javax.swing.DefaultListCellRenderer;import javax.swing.JComboBox;import javax.swing.JList;import javax.swing.ListCellRenderer;public class KeyValComboBox extends JComboBox{    public KeyValComboBox(Vector values){          super(values);          rendererData(); //渲染数据    }         public void rendererData(){          ListCellRenderer render = new DefautlListCellRenderer(){               public Component getListCellRendererComponent(JList list,Object value, int index, boolean isSelected, boolean cellHasFocus){                   super.getListCellRendererComponent(list, value, indx, isSelected, cellHasFocus);                   if (value instanceof CheckBoxPo){                        CheckBoxPo po = (CheckBoxPo) value;                        this.setText(po.text);                   }                   return this;               }          };          this.setRenderer(render);     }    //修改Combox中的数据     pulbic void updateData(Vector values){          setModel(new DefaultComboBoxModel(values));          rendererData();     }         @Override      public void setSelectedItem(Object anObject){ //选中text与传入的参数相同的项          if (anObject != null){               if (anObject instanceof CheckBoxPo){                     super.setSelectedItem(anObject);               }               if(anObject instanceof String){                     for (int index = 0; index < getItemCount(); index++){                            CheckBoxPo po = (CheckBoxPo) getItemAt(index);                            if (po.text.equals(anObject.toString())){                                   super.setSelectedIndex(index);                            }                     }               }          }else{                 super.setSelectedItem(anObject);          }      }            public void setSelectedValue(Object anObject){ //选中value与传入的参数相同的项          if(anObject != null){              if(anObject instanceof CheckBoxPo){                    super.setSelectedItem(anObject);              }              if(anObject instanceof String){                    for(int index = 0; index < getItemCount(); index++){                         CheckBoxPo po = (CheckBoxPo) getItemAt(index);                         if(po.value.equals(anObject.toString())){                             super.setSelectedIndex(index);                         }                    }              }          }else{               super.setSelectedItem(anObject);          }      }      //获得选中项的键值    public String getSelectedValue(){           if(getSelectedItem() instaceof CheckBoxPo){                CheckBoxPo po = (CheckBoxPo)getSelectItem();                return po.value;           }           return (getSelectedItem != null) ? getSelectedItem.toString() : null;      }      //获得选中项的显示文本    public String getSelectedText(){             if(getSelectedItem() instaceof CheckBoxPo){                CheckBoxPo po = (CheckBoxPo)getSelectItem();                return po.text;           }           return (getSelectedItem != null) ? getSelectedItem.toString() : null;      }}

用到的实体类

public class CheckBoxPo{     public String value = null;      public String text= null;     public CheckBoxPo(){}     public CheckBoxPo(String value,String text){         this.value = value;         this.text = text;     }}

使用方法

public KeyValComboBox getCboUpdateRule(){       if(cboUpdateRule == null){           Vector values = new Vector();           CheckBoxPo po = null;           for(int i = 0 ; i < 5; i++){               po = new CheckBoxPo();               po.value = i;               po.text = "选项"+i;               values.add(po);           }                    cboUpdateRule = new KeyValComboBox(values);       }}

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