PrettyStringComponent.java

package de.unisiegen.gtitool.core.parser.style;


import java.awt.Component;
import java.awt.Font;
import java.awt.FontMetrics;
import java.awt.Graphics;
import java.awt.event.MouseEvent;

import javax.swing.JComponent;
import javax.swing.JLabel;
import javax.swing.border.EmptyBorder;


/**
 * This class implements the {@link PrettyPrintable} {@link Component}.
 * 
 * @author Christian Fehler
 */
public final class PrettyStringComponent extends JLabel
{

  /**
   * The serial version uid.
   */
  private static final long serialVersionUID = 6078784158332697414L;


  /**
   * The used font.
   */
  private static final Font FONT = new Font ( "Dialog", Font.PLAIN, 12 ); //$NON-NLS-1$


  /**
   * The {@link PrettyString} of this component.
   */
  private PrettyString prettyString;


  /**
   * The center horizontal value.
   */
  private boolean centerHorizontal = false;


  /**
   * The center vertical value.
   */
  private boolean centerVertical = false;


  /**
   * Initializes the {@link PrettyStringComponent}.
   */
  public PrettyStringComponent ()
  {
    this ( null );
  }


  /**
   * Initializes the {@link PrettyStringComponent}.
   * 
   * @param prettyString The {@link PrettyString}.
   */
  public PrettyStringComponent ( PrettyString prettyString )
  {
    super ();
    this.prettyString = prettyString;
    setBorder ( new EmptyBorder ( 1, 1, 1, 1 ) );

    // used to calculate the preferered size
    setText ( "PrettyString" ); //$NON-NLS-1$
  }


  /**
   * Returns the prettyString.
   * 
   * @return The prettyString.
   * @see #prettyString
   */
  public final PrettyString getPrettyString ()
  {
    return this.prettyString;
  }


  /**
   * {@inheritDoc}
   * 
   * @see JComponent#getToolTipText(MouseEvent)
   */
  @Override
  public final String getToolTipText (
      @SuppressWarnings ( "unused" ) MouseEvent event )
  {
    if ( this.prettyString.toString ().equals ( "" ) || //$NON-NLS-1$
        !this.prettyString.isShortVersion () )
    {
      return null;
    }
    return this.prettyString.toHTMLString ();
  }


  /**
   * Returns the center horizontal value.
   * 
   * @return The center horizontal value.
   * @see #centerHorizontal
   */
  public final boolean isCenterHorizontal ()
  {
    return this.centerHorizontal;
  }


  /**
   * Returns the center vertical value.
   * 
   * @return The center vertical value.
   * @see #centerVertical
   */
  public final boolean isCenterVertical ()
  {
    return this.centerVertical;
  }


  /**
   * {@inheritDoc}
   * 
   * @see JComponent#paintComponent(Graphics)
   */
  @Override
  protected final void paintComponent ( Graphics g )
  {
    g.setColor ( getBackground () );
    g.fillRect ( 0, 0, getWidth (), getHeight () );
    g.setFont ( FONT );
    FontMetrics metrics = g.getFontMetrics ();

    PrettyString usedPrettyString = new PrettyString ();
    usedPrettyString.add ( this.prettyString );

    // short version
    if ( metrics.stringWidth ( this.prettyString.toString () ) > getWidth () )
    {
      this.prettyString.setShortVersion ( true );

      String dots = " ..."; //$NON-NLS-1$
      PrettyToken lastPrettyToken = null;
      while ( ( !usedPrettyString.isEmpty () )
          && ( ( metrics.stringWidth ( usedPrettyString.toString () + dots ) ) > getWidth () ) )
      {
        lastPrettyToken = usedPrettyString.removeLastPrettyToken ();
      }

      if ( lastPrettyToken != null )
      {
        char [] chars = lastPrettyToken.getChar ();
        int i = 0;
        String addText = ""; //$NON-NLS-1$
        while ( ( i < chars.length )
            && ( ( metrics.stringWidth ( usedPrettyString.toString () + addText
                + dots ) ) <= getWidth () ) )
        {
          addText += chars [ i ];
          i++ ;
        }

        if ( addText.length () > 0 )
        {
          addText = addText.substring ( 0, addText.length () - 1 );
        }

        PrettyToken prettyToken = new PrettyToken ( addText, lastPrettyToken
            .getStyle () );
        prettyToken.setOverwrittenColor ( lastPrettyToken
            .getOverwrittenColor () );
        usedPrettyString.add ( prettyToken );
      }

      // if empty do not use the first space
      if ( usedPrettyString.isEmpty () )
      {
        dots = "..."; //$NON-NLS-1$
      }

      usedPrettyString.add ( new PrettyToken ( dots, Style.NONE ) );
    }
    else
    {
      this.prettyString.setShortVersion ( false );
    }

    int dx = 0;
    if ( this.centerHorizontal )
    {
      dx = ( getWidth () - metrics.stringWidth ( usedPrettyString.toString () ) ) / 2;
    }

    int y = getHeight () - 3;
    if ( this.centerVertical )
    {
      y = y - ( ( getHeight () - metrics.getHeight () ) / 2 );
    }

    for ( PrettyToken currentToken : usedPrettyString.getPrettyToken () )
    {
      Font font = null;

      if ( !currentToken.isBold () && !currentToken.isItalic () )
      {
        font = FONT;
      }
      else if ( currentToken.isBold () && currentToken.isItalic () )
      {
        font = FONT.deriveFont ( Font.BOLD | Font.ITALIC );
      }
      else if ( currentToken.isBold () )
      {
        font = FONT.deriveFont ( Font.BOLD );
      }
      else if ( currentToken.isItalic () )
      {
        font = FONT.deriveFont ( Font.ITALIC );
      }

      g.setFont ( font );
      g.setColor ( currentToken.getColor () );
      char [] chars = currentToken.getChar ();
      for ( int i = 0 ; i < chars.length ; i++ )
      {
        g.drawChars ( chars, i, 1, dx, y );
        dx += metrics.charWidth ( chars [ i ] );
      }
    }
  }


  /**
   * Sets the center horizontal value.
   * 
   * @param centerHorizontal The center horizontal value to set.
   * @see #centerHorizontal
   */
  public final void setCenterHorizontal ( boolean centerHorizontal )
  {
    this.centerHorizontal = centerHorizontal;
  }


  /**
   * Sets the center vertical.
   * 
   * @param centerVertical The center vertical to set.
   * @see #centerVertical
   */
  public final void setCenterVertical ( boolean centerVertical )
  {
    this.centerVertical = centerVertical;
  }


  /**
   * Sets the prettyString.
   * 
   * @param prettyString The prettyString to set.
   * @see #prettyString
   */
  public final void setPrettyString ( PrettyString prettyString )
  {
    this.prettyString = prettyString;
  }
}