Dragged header cells rendering (simple L&Fs support added).

Author: Qualtagh

src/org/quinto/swing/table/view/JBroTableHeaderUI.java

@@ -26,6 +26,7 @@
 import javax.swing.RowSorter;
 import javax.swing.SwingUtilities;
 import javax.swing.UIManager;
+import javax.swing.border.Border;
 import javax.swing.event.MouseInputListener;
 import javax.swing.plaf.ComponentUI;
 import javax.swing.plaf.basic.BasicTableHeaderUI;
@@ -48,6 +49,7 @@ public class JBroTableHeaderUI extends BasicTableHeaderUI {
   private List< Integer > rowHeights;
   private boolean updating;
   private ComponentUI headerDelegate;
+  private ReverseBorder lastBorder;
 
   public JBroTableHeaderUI( JBroTable table ) {
     this.table = table;
@@ -88,7 +90,7 @@ private Object getField( String fieldName, ComponentUI ui ) {
       boolean accessible = field.isAccessible();
       if ( !accessible )
         field.setAccessible( true );
-      Object ret = ( Object )field.get( ui );
+      Object ret = field.get( ui );
       if ( !accessible )
         field.setAccessible( false );
       return ret;
@@ -401,6 +403,14 @@ private void paintCell( Graphics g, Rectangle cellRect, JBroTableColumn group )
     table.setCurrentLevel( group.getY() );
     Component comp = renderer.getTableCellRendererComponent( table, group.getHeaderValue(), rollover, rollover, group.getY(), getTableColumnModel().getColumnRelativeIndex( group ) );
     table.setCurrentLevel( null );
+    if ( !parentUIdeterminesRolloverColumnItself && comp instanceof JComponent && group == getHeader().getDraggedGroup() ) {
+      Border border = ( ( JComponent )comp ).getBorder();
+      if ( border != null ) {
+        if ( lastBorder == null || lastBorder.getDelegate() != border )
+          lastBorder = new ReverseBorder( border );
+        ( ( JComponent )comp ).setBorder( lastBorder );
+      }
+    }
     paintCell( g, comp, cellRect );
   }
 

src/org/quinto/swing/table/view/ReverseBorder.java

@@ -0,0 +1,39 @@
+package org.quinto.swing.table.view;
+
+import java.awt.Component;
+import java.awt.Graphics;
+import java.awt.Graphics2D;
+import java.awt.Insets;
+import javax.swing.border.Border;
+
+public class ReverseBorder implements Border {
+  private final Border delegate;
+
+  public ReverseBorder( Border delegate ) {
+    this.delegate = delegate;
+  }
+
+  @Override
+  public void paintBorder( Component c, Graphics g, int x, int y, int w, int h ) {
+    if ( g instanceof Graphics2D ) {
+      Graphics2D gg = ( Graphics2D )g;
+      gg.scale( -1.0, -1.0 );
+      gg.translate( 1 - w, 1 - h );
+    }
+    delegate.paintBorder( c, g, x, y, w, h );
+  }
+
+  @Override
+  public Insets getBorderInsets( Component c ) {
+    return delegate.getBorderInsets( c );
+  }
+
+  @Override
+  public boolean isBorderOpaque() {
+    return delegate.isBorderOpaque();
+  }
+
+  public Border getDelegate() {
+    return delegate;
+  }
+}