Added utility methods.

com/gallery/GalleryRemote/prefs/PreferencePanel.java

@@ -1,6 +1,7 @@
 package com.gallery.GalleryRemote.prefs;
 
 import com.gallery.GalleryRemote.GalleryProperties;
+import com.gallery.GalleryRemote.MainFrame;
 
 import javax.swing.*;
 
@@ -10,13 +11,39 @@
  * Date: May 8, 2003
  */
 public abstract class PreferencePanel extends JPanel {
-	public JPanel panel = new JPanel();
+	protected JPanel panel = new JPanel();
+	protected boolean hasBeenRead = false;
+	MainFrame mainFrame = null;
+	JDialog dialog = null;
 
 	public abstract JLabel getIcon();
 
+	public boolean isReversible() {
+		return true;
+	}
+
 	public abstract void buildUI();
 
+	public void readPropertiesFirst(GalleryProperties props) {
+		if (! hasBeenRead) {
+			hasBeenRead = true;
+			readProperties(props);
+		}
+	}
+
 	public abstract void readProperties(GalleryProperties props);
 
 	public abstract void writeProperties(GalleryProperties props);
+
+	public boolean hasBeenRead() {
+		return hasBeenRead;
+	}
+
+	public void setMainFrame(MainFrame mainFrame) {
+		this.mainFrame = mainFrame;
+	}
+
+	public void setDialog(JDialog dialog) {
+		this.dialog = dialog;
+	}
 }