iconcellrenderer.java

UCool网络硬盘

import javax.swing.tree.*;
import javax.swing.*;
import java.awt.*;

class IconCellRenderer extends JLabel implements TreeCellRenderer
{
 protected Color m_textSelectionColor;
 protected Color m_textNonSelectionColor;
 protected Color m_bkSelectionColor;
 protected Color m_bkNonSelectionColor;
 protected Color m_borderSelectionColor;

 protected boolean m_selected;

 public IconCellRenderer()
 {
  super();
  m_textSelectionColor = UIManager.getColor(
   "Tree.selectionForeground");
  m_textNonSelectionColor = UIManager.getColor(
   "Tree.textForeground");
  m_bkSelectionColor = UIManager.getColor(
   "Tree.selectionBackground");
  m_bkNonSelectionColor = UIManager.getColor(
   "Tree.textBackground");
  m_borderSelectionColor = UIManager.getColor(
   "Tree.selectionBorderColor");
  setOpaque(false);
 }

 public Component getTreeCellRendererComponent(JTree tree,
  Object value, boolean sel, boolean expanded, boolean leaf,
  int row, boolean hasFocus)

 {
	//FileSystemView fileSystemView=FileSystemView.getFileSystemView();
  DefaultMutableTreeNode node =
   (DefaultMutableTreeNode)value;
  Object obj = node.getUserObject();
  setText(obj.toString());

				if (obj instanceof Boolean)
				  setText("Retrieving data...");

  if (obj instanceof IconData)
  {
   IconData idata = (IconData)obj;

   if (expanded){
	setIcon(idata.getExpandedIcon());
   }
   else
   {
	setIcon(idata.getIcon());
   }
  }
  else
   setIcon(null);

  setFont(tree.getFont());
  setForeground(sel ? m_textSelectionColor :
   m_textNonSelectionColor);
  setBackground(sel ? m_bkSelectionColor :
   m_bkNonSelectionColor);
  m_selected = sel;
  return this;
 }


 public void paintComponent(Graphics g)
 {
  Color bColor = getBackground();
  Icon icon = getIcon();

  g.setColor(bColor);
  int offset = 0;
  if(icon != null && getText() != null)
   offset = (icon.getIconWidth() + getIconTextGap());
  g.fillRect(offset, 0, getWidth() - 1 - offset,
   getHeight() - 1);

  if (m_selected)
  {
   g.setColor(m_borderSelectionColor);
   g.drawRect(offset, 0, getWidth()-1-offset, getHeight()-1);
  }
  super.paintComponent(g);
	}
}