filetypeiconmanager.java

具有不同语法高亮的编辑器实例

/*
 * FileTypeIconManager.java - Associates an icon with a file type.
 */
package org.fife.rtext;

import java.awt.Component;
import java.awt.Graphics;
import java.beans.PropertyChangeEvent;
import java.beans.PropertyChangeListener;
import java.util.HashMap;
import javax.swing.Icon;
import javax.swing.ImageIcon;

/**
 * Manages icons used for file types by subclasses of
 * <code>AbstractMainView</code>.
 */
public class FileTypeIconManager {

  /**
   * The map of file extensions to icon names.
   */
  private HashMap ext2IconNameMap;

  /**
   * The map of icon names to icons.
   */
  private HashMap iconName2IconMap;

  /**
   * The icon to use when no specific icon is found.
   */
  private Icon defaultIcon;

  /**
   * The singleton instance of this class.
   */
  private static final FileTypeIconManager INSTANCE =
      new FileTypeIconManager();

  private static final String PATH = "org/fife/rtext/graphics/file_icons/";
  private static final String DEFAULT_ICON_PATH = PATH + "txt.gif";

      /*****************************************************************************/

  /**
   * Private constructor.
   */
  private FileTypeIconManager() {

    ClassLoader cl = this.getClass().getClassLoader();
    defaultIcon = new ImageIcon(cl.getResource(DEFAULT_ICON_PATH));

    ext2IconNameMap = new HashMap();
    ext2IconNameMap.put("bat", PATH + "bat.gif");
    ext2IconNameMap.put("cmd", PATH + "bat.gif");
    ext2IconNameMap.put("c", PATH + "c.gif");
    ext2IconNameMap.put("cpp", PATH + "cpp.gif");
    ext2IconNameMap.put("cxx", PATH + "cpp.gif");
    ext2IconNameMap.put("cs", PATH + "cs.gif");
    ext2IconNameMap.put("h", PATH + "h.gif");
    ext2IconNameMap.put("html", PATH + "html.gif");
    ext2IconNameMap.put("java", PATH + "java.gif");
    ext2IconNameMap.put("pl", PATH + "pl.gif");
    ext2IconNameMap.put("perl", PATH + "pl.gif");
    ext2IconNameMap.put("pm", PATH + "pl.gif");
    ext2IconNameMap.put("sas", PATH + "sas.gif");
    ext2IconNameMap.put("sh", PATH + "sh.gif");
    ext2IconNameMap.put("bsh", PATH + "sh.gif");
    ext2IconNameMap.put("csh", PATH + "sh.gif");
    ext2IconNameMap.put("ksh", PATH + "sh.gif");

    iconName2IconMap = new HashMap();

  }

      /*****************************************************************************/

  /**
   * Returns the icon for a view type to use for the specified text area.
   *
   * @param textArea The text area.
   * @return The icon to use for the text area.
   */
  public Icon getIconFor(RTextEditorPane textArea) {

    Icon icon = null;

    // If this file has no extension, use the default icon.
    String fileName = textArea.getFileName();
    int dot = fileName.lastIndexOf('.');
    if (dot == -1) {
      return defaultIcon;
    }

    // Check whether there's a special icon for this file extension.
    String extension = fileName.substring(dot + 1);
    String iconName = (String) ext2IconNameMap.get(extension);
    if (iconName != null) {
      icon = (Icon) iconName2IconMap.get(iconName);
      // Load and cache the icon if it's not yet loaded.
      if (icon == null) {
        ClassLoader cl = this.getClass().getClassLoader();
        icon = new ImageIcon(cl.getResource(iconName));
        iconName2IconMap.put(iconName, icon);
      }
    }

    // No special icon?  Then use the default one.
    else { // iconName==null.
      icon = defaultIcon;
    }

    return icon; //new TextAreaAwareIcon(icon);

  }

      /*****************************************************************************/

  /**
   * Returns the singleton instance of this class.
   *
   * @return The singleton instance of this class.
   */
  public static FileTypeIconManager getInstance() {
    return INSTANCE;
  }

      /*****************************************************************************/

  /**
   * An icon capable of displaying informational "subicons" in the corners
   * of a main icon.
   */
  class TextAreaAwareIcon
      implements Icon, PropertyChangeListener {

    private RTextEditorPane editorPane;
    private Icon icon;
    private boolean paintModifiedMarker;

    public TextAreaAwareIcon(RTextEditorPane editorPane, Icon icon) {
      this.editorPane = editorPane;
      editorPane.addPropertyChangeListener(this);
      this.icon = icon;
    }

    public int getIconHeight() {
      return icon.getIconHeight();
    }

    public int getIconWidth() {
      return icon.getIconWidth();
    }

    public void paintIcon(Component c, Graphics g, int x, int y) {
      icon.paintIcon(c, g, x, y);
      //if (paintModifiedMarker) {
      //}
    }

    public void propertyChange(PropertyChangeEvent e) {
      String propertyName = e.getPropertyName();
      if (RTextEditorPane.MODIFIED_PROPERTY.equals(propertyName)) {
        paintModifiedMarker = ( (Boolean) e.getNewValue()).
            booleanValue();
      }
    }

  }

      /*****************************************************************************/

}