+ Optimize for large lists by automatically setting prototypeValue to the longest (String value) item (boost performance by 1000x when loading large lists of files / episodes)

source/net/filebot/ui/rename/RenameList.java

@@ -1,7 +1,5 @@
-
 package net.filebot.ui.rename;
 
-
 import static java.util.Collections.*;
 
 import java.awt.BorderLayout;
@@ -12,7 +10,10 @@ import java.awt.event.MouseEvent;
 import javax.swing.AbstractAction;
 import javax.swing.JButton;
 import javax.swing.JPanel;
+import javax.swing.ListModel;
 import javax.swing.ListSelectionModel;
+import javax.swing.event.ListDataEvent;
+import javax.swing.event.ListDataListener;
 
 import net.filebot.ResourceManager;
 import net.filebot.ui.FileBotList;
@@ -21,19 +22,52 @@ import net.filebot.ui.transfer.TransferablePolicy;
 import net.miginfocom.swing.MigLayout;
 import ca.odell.glazedlists.EventList;
 
-
 class RenameList<E> extends FileBotList<E> {
 
 	private JPanel buttonPanel;
 
-	
 	public RenameList(EventList<E> model) {
 		// replace default model with given model
 		setModel(model);
 
-		list.setFixedCellHeight(28); // need a fixed cell high for high performance scrolling
+		// disable multi-selection for the sake of simplicity
 		list.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
 
+		// need a fixed cell size for high performance scrolling
+		list.setFixedCellHeight(28);
+		list.getModel().addListDataListener(new ListDataListener() {
+
+			private int longestItem = -1;
+
+			@Override
+			public void intervalRemoved(ListDataEvent evt) {
+				// reset prototype value
+				ListModel<?> m = (ListModel<?>) evt.getSource();
+				if (m.getSize() == 0) {
+					list.setPrototypeCellValue(null);
+					longestItem = -1;
+				}
+			}
+
+			@Override
+			public void intervalAdded(ListDataEvent evt) {
+				contentsChanged(evt);
+			}
+
+			@Override
+			public void contentsChanged(ListDataEvent evt) {
+				ListModel<?> m = (ListModel<?>) evt.getSource();
+				for (int i = evt.getIndex0(); i <= evt.getIndex1() && i < m.getSize(); i++) {
+					Object item = m.getElementAt(i);
+					int itemLength = item.toString().length();
+					if (itemLength > longestItem) {
+						list.setPrototypeCellValue(item);
+						longestItem = itemLength;
+					}
+				}
+			}
+		});
+
 		list.addMouseListener(dndReorderMouseAdapter);
 		list.addMouseMotionListener(dndReorderMouseAdapter);
 
@@ -50,19 +84,16 @@ class RenameList<E> extends FileBotList<E> {
 		listScrollPane.getViewport().setBackground(list.getBackground());
 	}
 
-	
 	public JPanel getButtonPanel() {
 		return buttonPanel;
 	}
 
-	
 	@Override
 	public void setTransferablePolicy(TransferablePolicy transferablePolicy) {
 		super.setTransferablePolicy(transferablePolicy);
 		loadAction.putValue(LoadAction.TRANSFERABLE_POLICY, transferablePolicy);
 	}
 
-	
 	private final LoadAction loadAction = new LoadAction(null);
 
 	private final AbstractAction upAction = new AbstractAction(null, ResourceManager.getIcon("action.up")) {
@@ -93,13 +124,11 @@ class RenameList<E> extends FileBotList<E> {
 
 		private int lastIndex = -1;
 
-		
 		@Override
 		public void mousePressed(MouseEvent m) {
 			lastIndex = getListComponent().getSelectedIndex();
 		}
 
-		
 		@Override
 		public void mouseDragged(MouseEvent m) {
 			int currentIndex = getListComponent().getSelectedIndex();

source/net/filebot/ui/rename/RenamePanel.java

@@ -155,9 +155,6 @@ public class RenamePanel extends JComponent {
 
 			@Override
 			public void actionPerformed(ActionEvent e) {
-				// lock cell with once user starts deleting cells (performance hack)
-				setFixedCellWidth(true);
-
 				RenameList list = null;
 				boolean deleteCell;
 
@@ -529,9 +526,6 @@ public class RenamePanel extends JComponent {
 			} else {
 				renameModel.clear();
 			}
-
-			// lock cell with once user starts deleting cells (performance hack)
-			setFixedCellWidth(false);
 		}
 	};
 
@@ -684,10 +678,4 @@ public class RenamePanel extends JComponent {
 		}
 	}
 
-	public void setFixedCellWidth(boolean fixed) {
-		for (RenameList<?> it : new RenameList[] { namesList, filesList }) {
-			it.getListComponent().setFixedCellWidth(fixed ? (int) it.getListComponent().getPreferredSize().getWidth() : -1);
-		}
-	}
-
 }