From: jsimomaa <jani.simomaa@gmail.com>
Date: Fri, 27 Jul 2018 07:09:16 +0000 (+0300)
Subject: Option to disable duplicate MouseWheelMovedEvent in G2D EventQueue
X-Git-Tag: v1.43.0~136^2~429
X-Git-Url: https://gerrit.simantics.org/r/gitweb?p=simantics%2Fplatform.git;a=commitdiff_plain;h=refs%2Fchanges%2F62%2F1962%2F3

Option to disable duplicate MouseWheelMovedEvent in G2D EventQueue

gitlab #64

Change-Id: Ifda3fb71ac2ddc71fc94dfdc198841a55e166953
---

diff --git a/bundles/org.simantics.scenegraph/src/org/simantics/scenegraph/g2d/events/EventQueue.java b/bundles/org.simantics.scenegraph/src/org/simantics/scenegraph/g2d/events/EventQueue.java
index b0a9c752b..9b0980600 100644
--- a/bundles/org.simantics.scenegraph/src/org/simantics/scenegraph/g2d/events/EventQueue.java
+++ b/bundles/org.simantics.scenegraph/src/org/simantics/scenegraph/g2d/events/EventQueue.java
@@ -14,6 +14,7 @@ package org.simantics.scenegraph.g2d.events;
 import java.lang.reflect.Method;
 import java.util.LinkedList;
 
+import org.simantics.scenegraph.g2d.events.MouseEvent.MouseWheelMovedEvent;
 import org.simantics.utils.datastructures.ListenerList;
 import org.simantics.utils.threads.IThreadWorkQueue;
 import org.simantics.utils.threads.SyncListenerList;
@@ -41,8 +42,28 @@ public class EventQueue implements IEventQueue, IEventHandler {
         return EventTypes.AnyMask;
     }
 
+    /**
+     * 
+     */
+    private MouseWheelMovedEvent lastMouseWheelMovedEvent;
+    
+    private static final String DISABLE_DUPLICATE_REMOVAL = "org.simantics.scenegraph.g2d.events.disableDuplicateMouseWheelEvent";
+    private static final boolean IGNORE_DUPLICATE = !Boolean.parseBoolean(System.getProperty(DISABLE_DUPLICATE_REMOVAL));
+    
+    private boolean ignoreDuplicateMouseWheelMovedEvent(Event e) {
+        if (IGNORE_DUPLICATE && e instanceof MouseWheelMovedEvent) {
+            if (e.time > 0 && (lastMouseWheelMovedEvent != null && lastMouseWheelMovedEvent.time < 0)) {
+                return true;
+            }
+            lastMouseWheelMovedEvent = (MouseWheelMovedEvent) e;
+        }
+        return false;
+    }
+    
     @Override
     public synchronized void queueEvent(Event e) {
+        if (ignoreDuplicateMouseWheelMovedEvent(e))
+            return;
         // coalesce with last
         EventCoalescer[] css = coalescers.getListeners();
         if (css.length > 0 && !queue.isEmpty()) {