multilinecellrenderer.java

tame,扩展了好多SWing组件:JTable

/* (swing1.1beta3) swing#977 */
package tame.tree;

import java.awt.Color;
import java.awt.Component;
import java.awt.Dimension;
import java.awt.FontMetrics;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.StringReader;

import javax.swing.BorderFactory;
import javax.swing.Box;
import javax.swing.BoxLayout;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JTextArea;
import javax.swing.JTree;
import javax.swing.SwingUtilities;
import javax.swing.UIManager;
import javax.swing.plaf.ColorUIResource;
import javax.swing.tree.TreeCellRenderer;

/**
@author Nobuo Tamemasa
@version 1.0 11/09/98
*/
public class MultiLineCellRenderer extends JPanel implements TreeCellRenderer {
  protected JLabel       icon;
  protected TreeTextArea text;

  public MultiLineCellRenderer() {
    setLayout(new BoxLayout(this,BoxLayout.X_AXIS));
    icon = new JLabel() {
      public void setBackground(Color color) {
        if(color instanceof ColorUIResource)
          color = null;
        super.setBackground(color);
      }
    };
    add(icon);
    add(Box.createHorizontalStrut(4));
    add(text  = new TreeTextArea());
  }

  public Component getTreeCellRendererComponent(JTree tree, Object value,
               boolean isSelected, boolean expanded,
               boolean leaf, int row, boolean hasFocus) {
    String  stringValue = tree.convertValueToText(value, isSelected,
			expanded, leaf, row, hasFocus);
    setEnabled(tree.isEnabled());
    text.setText(stringValue);
    text.setSelect(isSelected);
    text.setFocus(hasFocus);
    if (leaf) {
      icon.setIcon(UIManager.getIcon("Tree.leafIcon"));
    } else if (expanded) {
      icon.setIcon(UIManager.getIcon("Tree.openIcon"));
    } else {
      icon.setIcon(UIManager.getIcon("Tree.closedIcon"));
    }
    return this;
  }

  public Dimension getPreferredSize() {
    Dimension iconD = icon.getPreferredSize();
    Dimension textD = text.getPreferredSize();
    int height = iconD.height < textD.height ?
                 textD.height : iconD.height;
    return new Dimension(iconD.width + textD.width, height);
  }

  public void setBackground(Color color) {
    if (color instanceof ColorUIResource)
      color = null;
    super.setBackground(color);
  }

  class TreeTextArea extends JTextArea {
    Dimension preferredSize;

    TreeTextArea() {
      setLineWrap(true);
      setWrapStyleWord(true);
      setOpaque(true);
    }

    public void setBackground(Color color) {
	if(color instanceof ColorUIResource)
	    color = null;
	super.setBackground(color);
    }

    public void setPreferredSize(Dimension d) {
      if (d != null) {
        preferredSize = d;
      }
    }

    public Dimension getPreferredSize() {
      return preferredSize;
    }

    public void setText(String str) {
      FontMetrics fm = getToolkit().getFontMetrics(getFont());
      BufferedReader br = new BufferedReader(new StringReader(str));
      String line;
      int maxWidth = 0,lines = 0;
      try {
        while ((line = br.readLine()) != null) {
          int width = SwingUtilities.computeStringWidth(fm,line);
          if (maxWidth < width) {
            maxWidth = width;
          }
          lines++;
        }
      } catch (IOException ex) {
        ex.printStackTrace();
      }
      lines = (lines < 1) ? 1: lines;
      int height = fm.getHeight() * lines;
      setPreferredSize(new Dimension(maxWidth +6,height));
      super.setText(str);
    }

    void setSelect(boolean isSelected) {
      Color bColor;
      if (isSelected) {
        bColor = UIManager.getColor("Tree.selectionBackground");
      } else {
        bColor = UIManager.getColor("Tree.textBackground");
      }
      super.setBackground(bColor);
    }

    void setFocus(boolean hasFocus) {
      if (hasFocus) {
        Color lineColor = UIManager.getColor("Tree.selectionBorderColor");
        setBorder(BorderFactory.createLineBorder(lineColor));
      } else {
        setBorder(BorderFactory.createEmptyBorder(1,1,1,1));
      }
    }
  }
}