From c63f4e9662699fe5b8fff9d1b23c294ea7c4efab Mon Sep 17 00:00:00 2001
From: Karl Tauber <karl@jformdesigner.com>
Date: Fri, 18 Mar 2022 00:05:15 +0100
Subject: [PATCH] Window decorations on Linux: limit window resizing/moving to
 left mouse button (issue #482)

---
 .../main/java/com/formdev/flatlaf/ui/FlatTitlePane.java    | 6 ++++++
 .../java/com/formdev/flatlaf/ui/FlatWindowResizer.java     | 7 ++++---
 2 files changed, 10 insertions(+), 3 deletions(-)

diff --git a/flatlaf-core/src/main/java/com/formdev/flatlaf/ui/FlatTitlePane.java b/flatlaf-core/src/main/java/com/formdev/flatlaf/ui/FlatTitlePane.java
index e26a3e78..1836da77 100644
--- a/flatlaf-core/src/main/java/com/formdev/flatlaf/ui/FlatTitlePane.java
+++ b/flatlaf-core/src/main/java/com/formdev/flatlaf/ui/FlatTitlePane.java
@@ -1016,6 +1016,9 @@ debug*/
 			if( window == null )
 				return; // should newer occur
 
+			if( !SwingUtilities.isLeftMouseButton( e ) )
+				return;
+
 			dragOffset = SwingUtilities.convertPoint( FlatTitlePane.this, e.getPoint(), window );
 		}
 
@@ -1030,6 +1033,9 @@ debug*/
 			if( window == null )
 				return; // should newer occur
 
+			if( !SwingUtilities.isLeftMouseButton( e ) )
+				return;
+
 			if( hasNativeCustomDecoration() )
 				return; // do nothing if having native window border
 
diff --git a/flatlaf-core/src/main/java/com/formdev/flatlaf/ui/FlatWindowResizer.java b/flatlaf-core/src/main/java/com/formdev/flatlaf/ui/FlatWindowResizer.java
index 185ecddc..849c0a35 100644
--- a/flatlaf-core/src/main/java/com/formdev/flatlaf/ui/FlatWindowResizer.java
+++ b/flatlaf-core/src/main/java/com/formdev/flatlaf/ui/FlatWindowResizer.java
@@ -43,6 +43,7 @@ import javax.swing.JComponent;
 import javax.swing.JInternalFrame;
 import javax.swing.JLayeredPane;
 import javax.swing.JRootPane;
+import javax.swing.SwingUtilities;
 import javax.swing.UIManager;
 import com.formdev.flatlaf.util.SystemInfo;
 import com.formdev.flatlaf.util.UIScale;
@@ -521,7 +522,7 @@ debug*/
 
 		@Override
 		public void mousePressed( MouseEvent e ) {
-			if( !isWindowResizable() )
+			if( !SwingUtilities.isLeftMouseButton( e ) || !isWindowResizable() )
 				return;
 
 			int xOnScreen = e.getXOnScreen();
@@ -550,7 +551,7 @@ debug*/
 
 		@Override
 		public void mouseReleased( MouseEvent e ) {
-			if( !isWindowResizable() )
+			if( !SwingUtilities.isLeftMouseButton( e ) || !isWindowResizable() )
 				return;
 
 			dragLeftOffset = dragRightOffset = dragTopOffset = dragBottomOffset = 0;
@@ -576,7 +577,7 @@ debug*/
 
 		@Override
 		public void mouseDragged( MouseEvent e ) {
-			if( !isWindowResizable() )
+			if( !SwingUtilities.isLeftMouseButton( e ) || !isWindowResizable() )
 				return;
 
 			int xOnScreen = e.getXOnScreen();