Prevent reporting browser window resizing too often (#10675)

1 files changed, 19 insertions, 4 deletions

diff --git a/client/src/main/java/com/vaadin/client/ui/ui/UIConnector.java b/client/src/main/java/com/vaadin/client/ui/ui/UIConnector.java
index ad7a192d14..fc230c2425 100644
--- a/client/src/main/java/com/vaadin/client/ui/ui/UIConnector.java
+++ b/client/src/main/java/com/vaadin/client/ui/ui/UIConnector.java
@@ -142,6 +142,8 @@ public class UIConnector extends AbstractSingleComponentContainerConnector
         }
     };
 
+    private boolean firstSizeReported;
+
     @Override
     protected void init() {
         super.init();
@@ -200,11 +202,25 @@ public class UIConnector extends AbstractSingleComponentContainerConnector
             }-*/;
         });
 
+        // Used to avoid choking server with hundreds of resize events when user
+        // changes the window size
+        Timer lazyFlusher = new Timer() {
+            @Override
+            public void run() {
+                getConnection().getServerRpcQueue().flush();
+            }
+        };
+
         getWidget().addResizeHandler(event -> {
             getRpcProxy(UIServerRpc.class).resize(event.getWidth(),
                     event.getHeight(), Window.getClientWidth(),
                     Window.getClientHeight());
-            getConnection().getServerRpcQueue().flush();
+            if(!firstSizeReported) {
+                firstSizeReported = true;
+                getConnection().getServerRpcQueue().flush();
+            } else {
+                lazyFlusher.schedule(100);
+            }
         });
         getWidget().addScrollHandler(new ScrollHandler() {
             private int lastSentScrollTop = Integer.MAX_VALUE;
@@ -415,8 +431,7 @@ public class UIConnector extends AbstractSingleComponentContainerConnector
         if (firstPaint) {
             // Queue the initial window size to be sent with the following
             // request.
-            Scheduler.get()
-                    .scheduleDeferred(() -> ui.sendClientResized());
+            Scheduler.get().scheduleDeferred(() -> ui.sendClientResized());
         }
     }
 
@@ -1189,4 +1204,4 @@ public class UIConnector extends AbstractSingleComponentContainerConnector
          conf['dragImageCenterOnTouch'] = true;
          $wnd.DragDropPolyfill.Initialize(conf);
     }-*/;
-}
\ No newline at end of file
+}