Question

我的组合框有问题，我无法在组合中显示数据，我必须在左键单击之前右键单击以显示我的数据，但只需左键单击它就不可能

下图显示了第一种情况（当我左键单击时）

。

下图显示了第二种情况（当我在左键单击之前右键单击时）

感谢您的帮助

Answer 1

 /**
* Configure the renderer appropriately with the status of the
* Drawing object.
*/

public Component getListCellRendererComponent（JList list，对象值， int索引， boolean isSelected， boolean cellHasFocus）{ Component theResult = super.getListCellRendererComponent（list，value，index，isSelected，cellHasFocus）; System.out.println（“theResult：”+ theResult.toString（））; System.out.println（“débmethodegetLi class AWICombo =＆gt; value”+ value +“，index”+ index +“，isSelected”+ isSelected +“，celhasFocus”+ cellHasFocus）; //使用jdk 1.3在组合框中显示崩溃：setOpaque（true）解决了问题。 //（（JComponent）theResult）.setOpaque（true）; // setOpaque（true）; if（index == -1）{ System.out.println（“如果索引== -1”）; 返回结果; } 尝试{ System.out.println（“在try bloc 1”中）; boolean notEmpty = false; AWCState theObjectToDisplay = null;

       try {
           System.out.println("In try bloc 2");
           System.out.println("index " +index);
           System.out.println("theModel call :" +theModel.toString());
           theObjectToDisplay = (AWCState) theModel.theComboValues.elementAt( index );
           System.out.println("theObjectToDisplay => "+theObjectToDisplay.toString());
           System.out.println("dans conbobox "+index);
       } catch ( java.lang.ArrayIndexOutOfBoundsException aioobe ) {
        aioobe.printStackTrace();
       }
       // test if the first square of the conbo box is empty for doen't set the tool tips
       if ( theObjectToDisplay != null ) {
           System.out.println("In if 1");
           if ( theObjectToDisplay.toString() != null ) {
               System.out.println("In if 2");
               if ( value.toString().compareTo( theObjectToDisplay.toString() ) != 0 ) {
                   System.out.println("In if 3");
                   if ( value.toString().compareTo( "" ) != 0 ) {
                       System.out.println("In if 4");
                       theObjectToDisplay = (AWCState) theModel.theComboValues.elementAt( index - 1 );
                       notEmpty = true;
                   }
               } else {
                   System.out.println("In else 1");
                   notEmpty = true;
               }
           }
       } else {
           System.out.println("In else 2");
           theObjectToDisplay = (AWCState) theModel.theComboValues.elementAt( index - 1 );
           notEmpty = true;
       }

       if ( isSelected ) {
           System.out.println("In if isSelected "+list.getSelectionBackground());
           System.out.println("In if isSelected "+list.getSelectionForeground());
           setBackground( list.getSelectionBackground() );
           setForeground( list.getSelectionForeground() );
           setToolTip( list, notEmpty, theObjectToDisplay, value );
       } else {
           setBackground( list.getBackground() );
           setForeground( list.getForeground() );
       }

       setFont( list.getFont() );
       if ( value == null ) {
           System.out.println("In if value == null");
        setText("");
       }
       else {
        setText(value.toString());
       }

       // object is not obsolete
       if ( theObjectToDisplay == null || theObjectToDisplay.getStatus().equals( AWCConstants.OFFICIAL ) ) {
           System.out.println("object is not obsolete theObjectToDisplay=>"+theObjectToDisplay.toString());
           return theResult;
       }



       // object is obsolete
       if ( index == 1 ) {
           return theResult;
       }
       if ( !isSelected ) {
           theResult.setBackground( Color.red );
       } else {
           theResult.setBackground( new Color( 155, 100, 155 ) );
       }

   } 
   catch ( NullPointerException npe ) {
        npe.printStackTrace();
   } 
   catch ( java.lang.ArrayIndexOutOfBoundsException aioobe ) {
        aioobe.printStackTrace();
   }
   System.out.println("end of function");
   return theResult;

}

无法显示组合框列表

1 个答案: