commit 7fc15780aa876b6f444dde40e594d5a86aa64b8e
author Sergey Malenkov <sergey.malenkov@jetbrains.com> Wed Oct 05 20:30:17 2016 +0300
committer Sergey Malenkov <sergey.malenkov@jetbrains.com> Wed Oct 05 20:31:34 2016 +0300
tree 452c70d3ec561daa4de13aaf284861b67faaa656
parent 4d5e1c4d7e628cf5a7df294df9b1dd221dca0521

IDEA-161965 ignore dragged event that does not change mouse location
Sierra is more sensitive and generates drag events, which actually do not drag in Java coordinates.

src/macosx/classes/sun/lwawt/macosx/CPlatformResponder.java

diff --git a/src/macosx/classes/sun/lwawt/macosx/CPlatformResponder.java b/src/macosx/classes/sun/lwawt/macosx/CPlatformResponder.java
index a9e27a7..06d836b 100644
--- a/src/macosx/classes/sun/lwawt/macosx/CPlatformResponder.java
+++ b/src/macosx/classes/sun/lwawt/macosx/CPlatformResponder.java
@@ -49,6 +49,10 @@
     private int lastKeyPressCode = KeyEvent.VK_UNDEFINED;
     private final DeltaAccumulator deltaAccumulatorX = new DeltaAccumulator();
     private final DeltaAccumulator deltaAccumulatorY = new DeltaAccumulator();
+    private int lastDraggedAbsoluteX;
+    private int lastDraggedAbsoluteY;
+    private int lastDraggedRelativeX;
+    private int lastDraggedRelativeY;
 
     CPlatformResponder(final PlatformEventNotifier eventNotifier,
                        final boolean isNpapiCallback) {
@@ -71,6 +75,18 @@
         int jeventType = isNpapiCallback ? NSEvent.npToJavaEventType(eventType) :
                                            NSEvent.nsToJavaEventType(eventType);
 
+        boolean dragged = jeventType == MouseEvent.MOUSE_DRAGGED;
+        if (dragged  // ignore dragged event that does not change any location
+                && lastDraggedAbsoluteX == absoluteX && lastDraggedRelativeX == x
+                && lastDraggedAbsoluteY == absoluteY && lastDraggedRelativeY == y) return;
+
+        if (dragged || jeventType == MouseEvent.MOUSE_PRESSED) {
+            lastDraggedAbsoluteX = absoluteX;
+            lastDraggedAbsoluteY = absoluteY;
+            lastDraggedRelativeX = x;
+            lastDraggedRelativeY = y;
+        }
+
         int jbuttonNumber = MouseEvent.NOBUTTON;
         int jclickCount = 0;