sortbuttonrenderer.java

Java中Swing界面库中几个类使用的例子

/* (swing1.1) */

package jp.gr.java_conf.tame.swing.table;

import java.util.*;
import java.awt.*;
import javax.swing.*;
import javax.swing.table.*;
import jp.gr.java_conf.tame.swing.icon.*;

/**
 * @version 1.0 02/25/99
 */
public class SortButtonRenderer extends JButton implements TableCellRenderer {
  public static final int NONE = 0;
  public static final int DOWN = 1;
  public static final int UP   = 2;
  
  int pushedColumn;
  Hashtable state;
  JButton downButton,upButton;
  
  public SortButtonRenderer() {
    pushedColumn   = -1;
    state = new Hashtable();
    
    setMargin(new Insets(0,0,0,0));
    setHorizontalTextPosition(LEFT);
    setIcon(new BlankIcon());
    
    // perplexed  
    // ArrowIcon(SwingConstants.SOUTH, true)   
    // BevelArrowIcon (int direction, boolean isRaisedView, boolean isPressedView)
    
    downButton = new JButton();
    downButton.setMargin(new Insets(0,0,0,0));
    downButton.setHorizontalTextPosition(LEFT);
    downButton.setIcon(new BevelArrowIcon(BevelArrowIcon.DOWN, false, false));
    downButton.setPressedIcon(new BevelArrowIcon(BevelArrowIcon.DOWN, false, true));
    
    upButton = new JButton();
    upButton.setMargin(new Insets(0,0,0,0));
    upButton.setHorizontalTextPosition(LEFT);
    upButton.setIcon(new BevelArrowIcon(BevelArrowIcon.UP, false, false));
    upButton.setPressedIcon(new BevelArrowIcon(BevelArrowIcon.UP, false, true));
    
  }
  
  public Component getTableCellRendererComponent(JTable table, Object value,
                   boolean isSelected, boolean hasFocus, int row, int column) {
    JButton button = this;
    Object obj = state.get(new Integer(column));
    if (obj != null) {
      if (((Integer)obj).intValue() == DOWN) {
        button = downButton;
      } else {
        button = upButton;
      }
    }
    button.setText((value ==null) ? "" : value.toString());
    boolean isPressed = (column == pushedColumn);
    button.getModel().setPressed(isPressed);
    button.getModel().setArmed(isPressed);
    return button;
  }
  
  public void setPressedColumn(int col) {
    pushedColumn = col;
  }
  
  public void setSelectedColumn(int col) {
    if (col < 0) return;
    Integer value = null;
    Object obj = state.get(new Integer(col));
    if (obj == null) {
      value = new Integer(DOWN);
    } else {
      if (((Integer)obj).intValue() == DOWN) {
        value = new Integer(UP);
      } else {
        value = new Integer(DOWN);
      }
    }
    state.clear();
    state.put(new Integer(col), value);
  } 
  
  public int getState(int col) {
    int retValue;
    Object obj = state.get(new Integer(col));
    if (obj == null) {
      retValue = NONE;
    } else {
      if (((Integer)obj).intValue() == DOWN) {
        retValue = DOWN;
      } else {
        retValue = UP;
      }
    }
    return retValue;
  } 
}