checkrenderer.java

java class文件介绍

package zb.swing.renderer;

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

import zb.swing.*;

/**
 * @version 1.1 04/24/99
 */
public class CheckRenderer
    extends JPanel
    implements TreeCellRenderer {
  protected JCheckBox check;
  protected TreeLabel label;

  public CheckRenderer() {
    setLayout(null);
    add(check = new JCheckBox());
    add(label = new TreeLabel());
    check.setBackground(UIManager.getColor("Tree.textBackground"));
    label.setForeground(UIManager.getColor("Tree.textForeground"));
  }

  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());
    check.setSelected( ( (CheckNode) value).isSelected());
    label.setFont(tree.getFont());
    label.setText(stringValue);
    label.setSelected(isSelected);
    label.setFocus(hasFocus);
    if (leaf) {
      label.setIcon(UIManager.getIcon("Tree.leafIcon"));
    }
    else if (expanded) {
      label.setIcon(UIManager.getIcon("Tree.openIcon"));
    }
    else {
      label.setIcon(UIManager.getIcon("Tree.closedIcon"));
    }
    return this;
  }

  public Dimension getPreferredSize() {
    Dimension d_check = check.getPreferredSize();
    Dimension d_label = label.getPreferredSize();
    return new Dimension(d_check.width + d_label.width,
                         (d_check.height < d_label.height ?
                          d_label.height : d_check.height));
  }

  public void doLayout() {
    Dimension d_check = check.getPreferredSize();
    Dimension d_label = label.getPreferredSize();
    int y_check = 0;
    int y_label = 0;
    if (d_check.height < d_label.height) {
      y_check = (d_label.height - d_check.height) / 2;
    }
    else {
      y_label = (d_check.height - d_label.height) / 2;
    }
    check.setLocation(0, y_check);
    check.setBounds(0, y_check, d_check.width, d_check.height);
    label.setLocation(d_check.width, y_label);
    label.setBounds(d_check.width, y_label, d_label.width, d_label.height);
  }

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

  public class TreeLabel
      extends JLabel {
    boolean isSelected;
    boolean hasFocus;

    public TreeLabel() {
    }

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

    public void paint(Graphics g) {
      String str;
      if ( (str = getText()) != null) {
        if (0 < str.length()) {
          if (isSelected) {
            g.setColor(UIManager.getColor("Tree.selectionBackground"));
          }
          else {
            g.setColor(UIManager.getColor("Tree.textBackground"));
          }
          Dimension d = getPreferredSize();
          int imageOffset = 0;
          Icon currentI = getIcon();
          if (currentI != null) {
            imageOffset = currentI.getIconWidth() +
                Math.max(0, getIconTextGap() - 1);
          }
          g.fillRect(imageOffset, 0, d.width - 1 - imageOffset, d.height);
          if (hasFocus) {
            g.setColor(UIManager.getColor("Tree.selectionBorderColor"));
            g.drawRect(imageOffset, 0, d.width - 1 - imageOffset, d.height - 1);
          }
        }
      }
      super.paint(g);
    }

    public Dimension getPreferredSize() {
      Dimension retDimension = super.getPreferredSize();
      if (retDimension != null) {
        retDimension = new Dimension(retDimension.width + 3,
                                     retDimension.height);
      }
      return retDimension;
    }

    public void setSelected(boolean isSelected) {
      this.isSelected = isSelected;
    }

    public void setFocus(boolean hasFocus) {
      this.hasFocus = hasFocus;
    }
  }
}