src/org/objectweb/cjdbc/console/gui/jtools/JMultiLineToolTip.java

説明を見る。

package org.objectweb.cjdbc.console.gui.jtools;

import java.awt.Dimension;
import java.awt.Font;
import java.awt.Graphics;

import javax.swing.CellRendererPane;
import javax.swing.JComponent;
import javax.swing.JTextArea;
import javax.swing.JToolTip;
import javax.swing.plaf.ComponentUI;
import javax.swing.plaf.basic.BasicToolTipUI;

public class JMultiLineToolTip extends JToolTip
{

  public JMultiLineToolTip()
  {
    updateUI();
  }

  public void updateUI()
  {
    setUI(MultiLineToolTipUI.createUI(this));
  }

  public void setColumns(int columns)
  {
    this.columns = columns;
    this.fixedwidth = 0;
  }

  public int getColumns()
  {
    return columns;
  }

  public void setFixedWidth(int width)
  {
    this.fixedwidth = width;
    this.columns = 0;
  }

  public int getFixedWidth()
  {
    return fixedwidth;
  }

  protected int columns    = 0;
  protected int fixedwidth = 0;
}

class MultiLineToolTipUI extends BasicToolTipUI
{
  static MultiLineToolTipUI  sharedInstance = new MultiLineToolTipUI();
  Font                       smallFont;
  static JToolTip            tip;
  protected CellRendererPane rendererPane;

  private static JTextArea   textArea;

  public static ComponentUI createUI(JComponent c)
  {
    return sharedInstance;
  }

  public MultiLineToolTipUI()
  {
    super();
  }

  public void installUI(JComponent c)
  {
    super.installUI(c);
    tip = (JToolTip) c;
    rendererPane = new CellRendererPane();
    c.add(rendererPane);
  }

  public void uninstallUI(JComponent c)
  {
    super.uninstallUI(c);

    c.remove(rendererPane);
    rendererPane = null;
  }

  public void paint(Graphics g, JComponent c)
  {
    Dimension size = c.getSize();
    textArea.setBackground(c.getBackground());
    rendererPane.paintComponent(g, textArea, c, 1, 1, size.width - 1,
        size.height - 1, true);
  }

  public Dimension getPreferredSize(JComponent c)
  {
    String tipText = ((JToolTip) c).getTipText();
    if (tipText == null)
      return new Dimension(0, 0);
    textArea = new JTextArea(tipText);
    rendererPane.removeAll();
    rendererPane.add(textArea);
    textArea.setWrapStyleWord(true);
    int width = ((JMultiLineToolTip) c).getFixedWidth();
    int columns = ((JMultiLineToolTip) c).getColumns();

    if (columns > 0)
    {
      textArea.setColumns(columns);
      textArea.setSize(0, 0);
      textArea.setLineWrap(true);
      textArea.setSize(textArea.getPreferredSize());
    }
    else if (width > 0)
    {
      textArea.setLineWrap(true);
      Dimension d = textArea.getPreferredSize();
      d.width = width;
      d.height++;
      textArea.setSize(d);
    }
    else
      textArea.setLineWrap(false);

    Dimension dim = textArea.getPreferredSize();

    dim.height += 1;
    dim.width += 1;
    return dim;
  }

  public Dimension getMinimumSize(JComponent c)
  {
    return getPreferredSize(c);
  }

  public Dimension getMaximumSize(JComponent c)
  {
    return getPreferredSize(c);
  }
}

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