TableHeader: do not show resize cursor for last column if resizing la…

…st column is not possible because auto resize mode of table is not off (issue #332)

CHANGELOG.md

@@ -20,6 +20,8 @@ FlatLaf Change Log
 - OptionPane: Fixed rendering of longer HTML text if it is passed as
  `StringBuilder`, `StringBuffer`, or any other object that returns HTML text in
  method `toString()`. (similar to issue #12)
+- TableHeader: Do not show resize cursor for last column if resizing last column
+ is not possible because auto resize mode of table is not off. (issue #332)
 - TextField, FormattedTextField, PasswordField and ComboBox: Fixed alignment of
  placeholder text in right-to-left component orientation.
 

flatlaf-core/src/main/java/com/formdev/flatlaf/ui/FlatTableHeaderUI.java

@@ -18,10 +18,13 @@
 
 import java.awt.Color;
 import java.awt.Component;
+import java.awt.Cursor;
 import java.awt.Dimension;
 import java.awt.Graphics;
 import java.awt.Graphics2D;
 import java.awt.Insets;
+import java.awt.Rectangle;
+import java.awt.event.MouseEvent;
 import java.awt.geom.Rectangle2D;
 import java.util.Objects;
 import javax.swing.Icon;
@@ -31,6 +34,7 @@
 import javax.swing.SwingConstants;
 import javax.swing.UIManager;
 import javax.swing.border.Border;
+import javax.swing.event.MouseInputListener;
 import javax.swing.plaf.ComponentUI;
 import javax.swing.plaf.UIResource;
 import javax.swing.plaf.basic.BasicTableHeaderUI;
@@ -94,6 +98,11 @@ protected void uninstallDefaults() {
  bottomSeparatorColor = null;
  }
 
+ @Override
+ protected MouseInputListener createMouseInputListener() {
+ return new FlatMouseInputHandler();
+ }
+
  // overridden and made public to allow usage in custom renderers
  @Override
  public int getRolloverColumn() {
@@ -252,4 +261,54 @@ public boolean isBorderOpaque() {
  return (origBorder != null) ? origBorder.isBorderOpaque() : false;
  }
  }
+
+ //---- class FlatMouseInputHandler ----------------------------------------
+
+ /**
+ * @since 1.6
+ */
+ protected class FlatMouseInputHandler
+ extends MouseInputHandler
+ {
+ Cursor oldCursor;
+
+ @Override
+ public void mouseMoved( MouseEvent e ) {
+ // restore old cursor, which is necessary because super.mouseMoved() swaps cursors
+ if( oldCursor != null ) {
+ header.setCursor( oldCursor );
+ oldCursor = null;
+ }
+
+ super.mouseMoved( e );
+
+ // if resizing last column is not possible, then Swing still shows a resize cursor,
+ // which can be confusing for the user --> change cursor to standard cursor
+ JTable table;
+ int column;
+ if( header.isEnabled() &&
+ (table = header.getTable()) != null &&
+ table.getAutoResizeMode() != JTable.AUTO_RESIZE_OFF &&
+ header.getCursor() == Cursor.getPredefinedCursor( Cursor.E_RESIZE_CURSOR ) &&
+ (column = header.columnAtPoint( e.getPoint() )) >= 0 &&
+ column == header.getColumnModel().getColumnCount() - 1 )
+ {
+ // mouse is in last column
+ Rectangle r = header.getHeaderRect( column );
+ r.grow( -3, 0 );
+ if( !r.contains( e.getX(), e.getY() ) ) {
+ // mouse is in left or right resize area of last column
+ boolean isResizeLastColumn = (e.getX() >= r.x + (r.width / 2));
+ if( !header.getComponentOrientation().isLeftToRight() )
+ isResizeLastColumn = !isResizeLastColumn;
+
+ if( isResizeLastColumn ) {
+ // resize is not possible --> change cursor to standard cursor
+ oldCursor = header.getCursor();
+ header.setCursor( Cursor.getDefaultCursor() );
+ }
+ }
+ }
+ }
+ }
 }