iconcellrenderer.java

面向对象设计项目

package SpellCheck;

import java.awt.Color;
import java.awt.Component;
import java.awt.Graphics;

import javax.swing.Icon;
import javax.swing.JLabel;
import javax.swing.JTree;
import javax.swing.UIManager;
import javax.swing.tree.DefaultMutableTreeNode;
import javax.swing.tree.TreeCellRenderer;

@SuppressWarnings("serial")
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){
		DefaultMutableTreeNode node = (DefaultMutableTreeNode)value;
		Object obj = node.getUserObject();
		setText(obj.toString());

		if (obj instanceof Boolean)
			setText("正在读取数据...");

		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);
	}
}