Tree: improved support for JTree.getPathForLocation(int x, int y) in wide selection (issue #373)

this is experimental and disabled by default; enable with:
`UIManager.put( "FlatLaf.experimental.tree.widePathForLocation", true );`

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

@@ -230,6 +230,26 @@ public class FlatTreeUI
 			tree.repaint( 0, r.y, tree.getWidth(), r.height );
 	}
 
+	@Override
+	public Rectangle getPathBounds( JTree tree, TreePath path ) {
+		Rectangle bounds = super.getPathBounds( tree, path );
+
+		// If this method was invoked from JTree.getPathForLocation(int x, int y) to check whether
+		// the location is within tree node bounds, then return the bounds of a wide node.
+		// This changes the behavior of JTree.getPathForLocation(int x, int y) and
+		// JTree.getRowForLocation(int x, int y), which now return the path/row even
+		// if [x,y] is in the wide row area outside of the actual tree node.
+		if( bounds != null &&
+			isWideSelection() &&
+			UIManager.getBoolean( "FlatLaf.experimental.tree.widePathForLocation" ) &&
+			StackUtils.wasInvokedFrom( JTree.class.getName(), "getPathForLocation", 5 ) )
+		{
+			bounds.x = 0;
+			bounds.width = tree.getWidth();
+		}
+		return bounds;
+	}
+
 	/**
 	 * Same as super.paintRow(), but supports wide selection and uses
 	 * inactive selection background/foreground if tree is not focused.

flatlaf-testing/src/main/java/com/formdev/flatlaf/testing/FlatComponents2Test.java

@@ -24,6 +24,7 @@ import java.awt.EventQueue;
 import java.awt.datatransfer.DataFlavor;
 import java.awt.datatransfer.StringSelection;
 import java.awt.datatransfer.Transferable;
+import java.awt.event.*;
 import java.io.File;
 import java.util.ArrayList;
 import java.util.HashMap;
@@ -39,6 +40,7 @@ import javax.swing.tree.DefaultMutableTreeNode;
 import javax.swing.tree.DefaultTreeCellRenderer;
 import javax.swing.tree.DefaultTreeModel;
 import javax.swing.tree.TreeCellRenderer;
+import javax.swing.tree.TreePath;
 import com.formdev.flatlaf.FlatClientProperties;
 import com.formdev.flatlaf.FlatLaf;
 import com.formdev.flatlaf.icons.FlatMenuArrowIcon;
@@ -69,6 +71,7 @@ public class FlatComponents2Test
 		SwingUtilities.invokeLater( () -> {
 			FlatTestFrame frame = FlatTestFrame.create( args, "FlatComponents2Test" );
 			frame.useApplyComponentOrientation = true;
+			UIManager.put( "FlatLaf.experimental.tree.widePathForLocation", true );
 			frame.showFrame( FlatComponents2Test::new );
 		} );
 	}
@@ -378,6 +381,23 @@ public class FlatComponents2Test
 			tree.putClientProperty( FlatClientProperties.TREE_PAINT_SELECTION, paintSelection );
 	}
 
+	private void treeMouseClicked( MouseEvent e ) {
+		JTree tree = (JTree) e.getSource();
+		int x = e.getX();
+		int y = e.getY();
+
+		TreePath path = tree.getPathForLocation( x, y );
+		TreePath closestPath = tree.getClosestPathForLocation( x, y );
+		int row = tree.getRowForLocation( x, y );
+		int closestRow = tree.getClosestRowForLocation( x, y );
+
+		System.out.println( "---- tree mouseClicked " + x + "," + y + " ----" );
+		System.out.println( "        path:  " + path );
+		System.out.println( "closest path:  " + closestPath );
+		System.out.println( "        row:   " + row );
+		System.out.println( "closest row:   " + closestRow );
+	}
+
 	@Override
 	public void applyComponentOrientation( ComponentOrientation o ) {
 		super.applyComponentOrientation( o );
@@ -605,6 +625,12 @@ public class FlatComponents2Test
 			//---- tree1 ----
 			tree1.setShowsRootHandles(true);
 			tree1.setEditable(true);
+			tree1.addMouseListener(new MouseAdapter() {
+				@Override
+				public void mouseClicked(MouseEvent e) {
+					treeMouseClicked(e);
+				}
+			});
 			scrollPane3.setViewportView(tree1);
 		}
 		add(scrollPane3, "cell 1 2");
@@ -614,6 +640,12 @@ public class FlatComponents2Test
 
 			//---- tree2 ----
 			tree2.setEnabled(false);
+			tree2.addMouseListener(new MouseAdapter() {
+				@Override
+				public void mouseClicked(MouseEvent e) {
+					treeMouseClicked(e);
+				}
+			});
 			scrollPane4.setViewportView(tree2);
 		}
 		add(scrollPane4, "cell 2 2");
@@ -655,12 +687,28 @@ public class FlatComponents2Test
 
 		//======== scrollPane5 ========
 		{
+
+			//---- xTree1 ----
+			xTree1.addMouseListener(new MouseAdapter() {
+				@Override
+				public void mouseClicked(MouseEvent e) {
+					treeMouseClicked(e);
+				}
+			});
 			scrollPane5.setViewportView(xTree1);
 		}
 		add(scrollPane5, "cell 1 3");
 
 		//======== scrollPane6 ========
 		{
+
+			//---- checkBoxTree1 ----
+			checkBoxTree1.addMouseListener(new MouseAdapter() {
+				@Override
+				public void mouseClicked(MouseEvent e) {
+					treeMouseClicked(e);
+				}
+			});
 			scrollPane6.setViewportView(checkBoxTree1);
 		}
 		add(scrollPane6, "cell 2 3");

flatlaf-testing/src/main/java/com/formdev/flatlaf/testing/FlatComponents2Test.jfd

@@ -1,4 +1,4 @@
-JFDML JFormDesigner: "7.0.3.1.342" Java: "16" encoding: "UTF-8"
+JFDML JFormDesigner: "7.0.4.0.360" Java: "16" encoding: "UTF-8"
 
 new FormModel {
 	contentType: "form/swing"
@@ -185,6 +185,7 @@ new FormModel {
 					auxiliary() {
 						"JavaCodeGenerator.variableLocal": false
 					}
+					addEvent( new FormEvent( "java.awt.event.MouseListener", "mouseClicked", "treeMouseClicked", true ) )
 				} )
 			}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
 				"value": "cell 1 2"
@@ -197,6 +198,7 @@ new FormModel {
 					auxiliary() {
 						"JavaCodeGenerator.variableLocal": false
 					}
+					addEvent( new FormEvent( "java.awt.event.MouseListener", "mouseClicked", "treeMouseClicked", true ) )
 				} )
 			}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
 				"value": "cell 2 2"
@@ -255,6 +257,7 @@ new FormModel {
 					auxiliary() {
 						"JavaCodeGenerator.variableLocal": false
 					}
+					addEvent( new FormEvent( "java.awt.event.MouseListener", "mouseClicked", "treeMouseClicked", true ) )
 				} )
 			}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
 				"value": "cell 1 3"
@@ -266,6 +269,7 @@ new FormModel {
 					auxiliary() {
 						"JavaCodeGenerator.variableLocal": false
 					}
+					addEvent( new FormEvent( "java.awt.event.MouseListener", "mouseClicked", "treeMouseClicked", true ) )
 				} )
 			}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
 				"value": "cell 2 3"